Merge dev into main: v3.0.0 stable release

release: v3.0.0 stable with Extension System
fix: bottom overflow in Folder Organization dialog
2026-07-03 11:18:04 +02:00 · 2026-01-14 18:08:30 +07:00 · 2026-01-14 01:57:30 +07:00 · 2026-01-14 01:00:52 +07:00 · 2026-01-14 00:57:04 +07:00 · 2026-01-14 00:39:59 +07:00
88 changed files with 25122 additions and 3093 deletions
@@ -0,0 +1,123 @@
+name: Bug Report
+description: Report a bug or unexpected behavior
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report a bug! Please fill out the form below.
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      description: Please confirm the following before submitting
+      options:
+        - label: I have searched existing issues and this bug hasn't been reported yet
+          required: true
+        - label: I am using the latest version of SpotiFLAC (Stable Version)
+          required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug Description
+      description: A clear and concise description of what the bug is
+      placeholder: Describe the bug...
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      description: Steps to reproduce the behavior
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+      placeholder: Describe what you expected...
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+      description: What actually happened?
+      placeholder: Describe what actually happened...
+    validations:
+      required: true
+
+  - type: input
+    id: version
+    attributes:
+      label: App Version
+      description: Which version of SpotiFLAC are you using? (Check in Settings > About)
+      placeholder: "e.g., v2.2.0"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: platform
+    attributes:
+      label: Platform
+      description: Which platform are you using?
+      options:
+        - Android
+        - iOS
+    validations:
+      required: true
+
+  - type: input
+    id: device
+    attributes:
+      label: Device & OS Version
+      description: What device and OS version are you using?
+      placeholder: "e.g., Samsung Galaxy S24, Android 14"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: download-service
+    attributes:
+      label: Download Service
+      description: Which download service were you using when the bug occurred?
+      options:
+        - Tidal
+        - Qobuz
+        - Amazon Music
+        - Deezer (search only)
+        - Not applicable
+    validations:
+      required: true
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs / Screenshots
+      description: |
+        If applicable, add logs or screenshots to help explain your problem.
+        
+        **To get logs:**
+        1. Go to Settings > Options > Detailed Logging (turn ON)
+        2. Reproduce the bug
+        3. Go to Settings > Logs
+        4. Tap Share button to export logs
+      placeholder: Paste logs or drag & drop screenshots here...
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Any other context about the problem
+      placeholder: Add any other context...
@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: README
+    url: https://github.com/zarzet/SpotiFLAC-Mobile#readme
+    about: Check the README for setup instructions and FAQ
+  - name: Extension Development Guide
+    url: https://zarz.moe/docs
+    about: Documentation for building SpotiFLAC extensions
@@ -0,0 +1,111 @@
+name: Download Issue
+description: Report issues with downloading specific tracks or albums
+title: "[Download]: "
+labels: ["download-issue"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Having trouble downloading a specific track or album? Please provide details below.
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      description: Please confirm the following before submitting
+      options:
+        - label: I have tried downloading with a different service (Tidal/Qobuz/Amazon)
+          required: true
+        - label: I am using the latest version of SpotiFLAC (Stable Version)
+          required: true
+
+  - type: dropdown
+    id: issue-type
+    attributes:
+      label: Issue Type
+      description: What kind of download issue are you experiencing?
+      options:
+        - Track not found on service
+        - Wrong track downloaded
+        - Download fails/errors
+        - Metadata incorrect
+        - Audio quality issue
+        - Other
+    validations:
+      required: true
+
+  - type: input
+    id: spotify-url
+    attributes:
+      label: Spotify URL
+      description: The Spotify URL of the track/album you're trying to download
+      placeholder: "https://open.spotify.com/track/..."
+    validations:
+      required: true
+
+  - type: input
+    id: track-info
+    attributes:
+      label: Track Info
+      description: Artist name and track title
+      placeholder: "Artist - Track Title"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: download-service
+    attributes:
+      label: Download Service
+      description: Which service did you try to download from?
+      options:
+        - Tidal
+        - Qobuz
+        - Amazon Music
+        - All services
+    validations:
+      required: true
+
+  - type: dropdown
+    id: search-service
+    attributes:
+      label: Search Service
+      description: Which search service are you using?
+      options:
+        - Spotify
+        - Deezer
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Describe the issue in detail
+      placeholder: |
+        What happened? What did you expect?
+        If wrong track was downloaded, what track was downloaded instead?
+    validations:
+      required: true
+
+  - type: input
+    id: version
+    attributes:
+      label: App Version
+      description: Which version of SpotiFLAC are you using?
+      placeholder: "e.g., v2.2.0"
+    validations:
+      required: true
+
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots / Logs
+      description: |
+        If applicable, add screenshots or logs.
+        
+        **To get logs:**
+        1. Go to Settings > Options > Detailed Logging (turn ON)
+        2. Try downloading the track again
+        3. Go to Settings > Logs
+        4. Tap Share button to export logs
+      placeholder: Drag & drop screenshots or paste logs here...
@@ -0,0 +1,117 @@
+name: Extension API Feature Request
+description: Request new API features or capabilities for extension development
+title: "[Extension API]: "
+labels: ["enhancement", "extension-api"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for helping improve the SpotiFLAC Extension API! 
+        This form is for extension developers who need new features or capabilities that don't exist yet.
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      description: Please confirm the following before submitting
+      options:
+        - label: I have read the [Extension Development Guide](https://github.com/zarzet/SpotiFLAC-Mobile/blob/main/docs/EXTENSION_DEVELOPMENT.md)
+          required: true
+        - label: I have searched existing issues and this API feature hasn't been requested yet
+          required: true
+
+  - type: textarea
+    id: extension_goal
+    attributes:
+      label: What are you trying to build?
+      description: Describe the extension or feature you're developing
+      placeholder: "I'm building an extension that downloads from [service name] / provides metadata from [source]..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: current_limitation
+    attributes:
+      label: Current API Limitation
+      description: What's missing or limiting in the current extension API?
+      placeholder: |
+        The current API doesn't support:
+        - [missing feature 1]
+        - [missing feature 2]
+        
+        This prevents me from...
+    validations:
+      required: true
+
+  - type: textarea
+    id: proposed_api
+    attributes:
+      label: Proposed API / Feature
+      description: Describe the API or feature you'd like to see added
+      placeholder: |
+        I would like to have:
+        - A new function `api.newFeature()` that does X
+        - A new manifest field `newOption` that enables Y
+        - Access to Z capability...
+    validations:
+      required: true
+
+  - type: textarea
+    id: use_case
+    attributes:
+      label: Use Case Example
+      description: Provide a code example of how you would use this feature
+      placeholder: |
+        ```javascript
+        // Example usage in extension code
+        function download(request, progressCallback) {
+          const result = api.proposedFeature(params);
+          // ...
+        }
+        ```
+    validations:
+      required: false
+
+  - type: dropdown
+    id: api_category
+    attributes:
+      label: API Category
+      description: What category does this feature fall under?
+      options:
+        - HTTP/Network API
+        - File System API
+        - Storage API
+        - FFmpeg/Audio Processing
+        - Manifest Options
+        - Runtime Functions
+        - UI Integration
+        - Authentication
+        - Other
+    validations:
+      required: true
+
+  - type: dropdown
+    id: priority
+    attributes:
+      label: How critical is this for your extension?
+      options:
+        - Blocker - Cannot build my extension without this
+        - High - Major functionality depends on this
+        - Medium - Would significantly improve my extension
+        - Low - Nice to have
+    validations:
+      required: true
+
+  - type: textarea
+    id: workaround
+    attributes:
+      label: Current Workaround
+      description: Are you using any workaround currently? If so, describe it.
+      placeholder: "Currently I'm working around this by..."
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Add any other context, links to similar APIs, or examples from other platforms
+      placeholder: "Similar feature in other platforms: ..."
@@ -0,0 +1,66 @@
+name: Feature Request
+description: Suggest a new feature or improvement
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting a feature! Please fill out the form below.
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      description: Please confirm the following before submitting
+      options:
+        - label: I have searched existing issues and this feature hasn't been requested yet
+          required: true
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem / Motivation
+      description: Is your feature request related to a problem? Please describe.
+      placeholder: "A clear description of what the problem is. Ex: I'm always frustrated when..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe the solution you'd like
+      placeholder: A clear description of what you want to happen...
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Describe any alternative solutions or features you've considered
+      placeholder: Other approaches you've thought about...
+
+  - type: dropdown
+    id: category
+    attributes:
+      label: Category
+      description: What category does this feature fall under?
+      options:
+        - UI/UX Improvement
+        - Download Feature
+        - New Service Integration
+        - Metadata/Tagging
+        - Performance
+        - Settings/Configuration
+        - Other
+    validations:
+      required: true
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional Context
+      description: Add any other context, mockups, or screenshots about the feature request
+      placeholder: Add any other context or screenshots...
@@ -93,11 +93,12 @@ jobs:
          # Accept licenses
          yes | $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager --licenses || true

-          # Install NDK (required for gomobile)
-          $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager "ndk;25.2.9519653" "platforms;android-34" "build-tools;34.0.0"
+          # Install NDK r27d LTS (required for 16KB page size support on Android 15+)
+          # Platform android-36 and build-tools 36.0.0 for targetSdk 36 (Android 16)
+          $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager "ndk;27.3.13750724" "platforms;android-36" "build-tools;36.0.0"

          # Set NDK path
-          echo "ANDROID_NDK_HOME=$ANDROID_HOME/ndk/25.2.9519653" >> $GITHUB_ENV
+          echo "ANDROID_NDK_HOME=$ANDROID_HOME/ndk/27.3.13750724" >> $GITHUB_ENV

      - name: Install gomobile
        run: |
@@ -144,7 +145,7 @@ jobs:
          keyStorePassword: ${{ secrets.KEYSTORE_PASSWORD }}
          keyPassword: ${{ secrets.KEY_PASSWORD }}
        env:
-          BUILD_TOOLS_VERSION: "34.0.0"
+          BUILD_TOOLS_VERSION: "36.0.0"

      - name: Rename APKs
        run: |
@@ -344,6 +345,8 @@ jobs:
            CHANGELOG="See CHANGELOG.md for details."
          else
            echo "Found changelog content"
+            # Remove trailing --- separator if present (CHANGELOG uses --- between versions)
+            CHANGELOG=$(echo "$CHANGELOG" | sed '/^---$/d')
          fi

          # Save to file for multiline support
@@ -13,6 +13,9 @@ Thumbs.db
 # Reference folder (development only)
 referensi/

+# Documentation (development only, published separately)
+docs/
+
 # Old spotiflac_android folder (moved to root)
 spotiflac_android/

@@ -50,3 +53,9 @@ ios/.symlinks/
 ios/Flutter/Flutter.framework/
 ios/Flutter/Flutter.podspec
 android/app/libs/gobackend-sources.jar
+
+# Extension folder
+extension/
+
+# Agent instructions
+AGENTS.md
@@ -1,5 +1,686 @@
 # Changelog

+## [3.0.0] - 2026-01-14
+
+### Extension System (Major Feature)
+
+SpotiFLAC 3.0 introduces a powerful extension system that allows third-party integrations for metadata, downloads, and more.
+
+#### Extension Store
+
+- Browse and install extensions directly from the app
+- New "Store" tab in bottom navigation
+- Browse by category: Metadata, Download, Utility, Lyrics, Integration
+- Search extensions by name, description, or tags
+- One-tap install, update, and uninstall
+- Offline cache for browsing without internet
+
+#### Spotify Web Extension
+
+- Available in Extension Store - install and enable in Settings > Extensions
+- Metadata provider using Spotify's internal web player API
+- Download tracks from Daily Mix, Discover Weekly, and other personalized playlists
+- Useful when official Spotify API is rate-limited or unavailable
+
+#### Extension Capabilities
+
+- **Custom Search Providers**
+- **Custom URL Handlers**
+- **Custom Thumbnail Ratios**: Square (1:1), Wide (16:9), Portrait (2:3)
+- **Post-Processing Hooks**: Extensions can process downloaded files
+- **Quality Options**: Extensions can define custom quality settings
+
+#### Extension APIs
+
+- Full HTTP support: GET, POST, PUT, DELETE, PATCH
+- Persistent cookie jar per extension
+- Browser-like polyfills: `fetch()`, `atob()`/`btoa()`, `TextEncoder`/`TextDecoder`, `URL`/`URLSearchParams`
+- Storage API for persistent data
+- File API for file operations
+- HMAC-SHA1 utility for cryptographic operations
+
+#### Security
+
+- Sandboxed JavaScript runtime (goja)
+- Permission-based access control
+- Network domain whitelisting
+- Improved credential encryption with per-installation random salt
+
+### Added
+
+- **Album Folder Structure Setting**: Option to remove artist folder from album path
+
+  - `Artist / Album` (default): `Albums/Artist Name/Album Name/`
+  - `Album Only`: `Albums/Album Name/`
+
+- **Separate Singles Folder**: Organize downloads into Albums/ and Singles/ folders
+
+  - Based on `album_type` from Spotify/Deezer metadata
+  - Toggle in Settings > Download > Separate Singles Folder
+
+- **Parallel API Calls**: Download URL fetching now uses parallel requests
+  - Tidal: All 8 APIs requested simultaneously, first success wins
+  - Qobuz: Both APIs requested simultaneously, first success wins
+  - Significantly reduces download URL fetch time
+
+### UI/UX Improvements
+
+- **Swipeable History Filters**: History tab now supports swipe gestures between All, Albums, and Singles filters
+
+  - Swipe left/right to switch between filter tabs
+  - Filter chips sync with swipe position
+  - Smooth edge-to-edge transition: swipe past Singles to go to Store, swipe past All to go to Home
+  - Natural gesture feel - drag connects to parent navigation
+
+  - **Improved File Open Intent**: Play button in History now correctly opens music players only
+  - Added proper MIME type (`audio/flac`, `audio/mpeg`, etc.) when opening downloaded files
+  - Prevents system from showing unrelated apps in the "Open with" dialog
+
+### Fixed
+
+- **Fixed Tab Edge Overscroll**: Home and Settings tabs now stop at edges instead of bouncing into empty space
+
+- **Fixed Extension Duplicate Load Error**: Extension loading now silently skips already-loaded extensions instead of throwing error
+
+- **Fixed Settings Item Highlight on Swipe**: Settings items no longer highlight when swiping at page edge
+
+- **Fixed Keyboard Appearing on Tab Switch**: Keyboard now auto-dismisses when swiping between tabs
+
+- **Removed Search Source Badges**: Removed "Free" and "API Key" labels from Deezer/Spotify selector in Options
+
+- **Back Gesture Freeze on Android 13+**: Fixed app freeze when using back gesture in settings
+
+  - Added `PopScope` with `canPop: true` to all settings pages
+  - Changed navigation to use `PageRouteBuilder` with proper slide transition
+
+- **Bottom Overflow in Folder Organization Dialog**: Fixed overflow in portrait and landscape mode
+
+  - Made dialog scrollable with max height constraint
+
+- **Japanese Artist Name Order**: Fixed artist mismatch for Japanese names
+
+  - "Sawano Hiroyuki" vs "Hiroyuki Sawano" now correctly matches
+
+- **Multi-Artist Matching**: Fixed artist mismatch for collaboration tracks
+
+  - "RADWIMPS feat. Toko Miura" now matches when service only shows "Toko Miura"
+
+- **Max Resolution Cover Download**: Fixed cover not upgrading to max resolution on mobile
+
+  - Mobile now correctly upgrades 300x300 → 640x640 → max resolution (~2000x2000)
+
+- **EXISTS: Prefix in File Path**: Fixed "File not found" error in metadata screen
+
+  - Duplicate detection prefix now stripped before saving to history
+
+- **Extension Search Result Parsing**: Fixed "cannot unmarshal array" error
+
+  - Go backend now handles both array and object formats from extensions
+
+- **Store Tab Unmount Crash**: Fixed "Using ref when widget is unmounted" error
+
+- **Duplicate History Entries**: Fixed duplicate entries when re-downloading same track
+
+  - Detects existing entries by Spotify ID, Deezer ID, or ISRC
+
+- **Permission Error Message**: Fixed download showing "Song not found" when actually permission error
+
+  - Now shows proper message: "Cannot write to folder, check storage permission"
+
+- **Android 13+ Storage Permission**: Fixed storage permission not working on Android 13+
+  - Now requests both `MANAGE_EXTERNAL_STORAGE` and `READ_MEDIA_AUDIO`
+
+### Changed
+
+- **Extension Manifest**: New `file` permission required for file operations
+  ```json
+  "permissions": {
+    "network": ["api.example.com"],
+    "storage": true,
+    "file": true
+  }
+  ```
+
+### Technical
+
+- Go backend: Simplified parallel download result handling in Tidal/Qobuz
+- Go backend: Removed unused functions and fixed bit shifting warnings
+- Release workflow: Fixed duplicate `---` separator in release notes
+
+---
+
+## [3.0.0-beta.2] - 2026-01-13
+
+### Added
+
+- **Album Folder Structure Setting**: Option to remove artist folder from album path
+  - New setting in Download Settings when "Separate Singles Folder" is enabled
+  - `Artist / Album` (default): `Albums/Artist Name/Album Name/`
+  - `Album Only`: `Albums/Album Name/`
+  - Requested by user who prefers flat album organization
+
+### Fixed
+
+- **Back Gesture Freeze on OnePlus/Android 13+**: Fixed app freeze when using back gesture in settings
+
+  - Added `PopScope` with `canPop: true` to all settings pages
+  - Changed navigation to use `PageRouteBuilder` with proper slide transition
+  - Fixes predictive back gesture conflict on devices with gesture navigation
+  - Affected pages: Download, Appearance, Options, Extensions, About, Logs, Extension Detail
+
+- **Extension Search Result Parsing**: Fixed "cannot unmarshal array into Go value" error
+
+  - Go backend now handles both array and object formats from extensions
+  - Extensions returning `[{track}, {track}]` now work correctly
+  - Extensions returning `{tracks: [...], total: N}` still work as before
+
+- **Max Resolution Cover Download**: Fixed cover not upgrading to max resolution on mobile
+
+  - Added missing `spotifySize300` constant (300x300 size code)
+  - Mobile now correctly upgrades 300x300 → 640x640 → max resolution (~2000x2000)
+  - Added `_upgradeToMaxQualityCover()` helper in Flutter for M4A conversion path
+  - Go backend `cover.go` now directly replaces URL without HEAD verification
+
+- **Extension Search Provider Reset**: Fixed search provider not resetting to default when disabled
+
+  - `copyWith` in `AppSettings` couldn't set `searchProvider` to `null`
+  - Added `clearSearchProvider` boolean parameter to properly clear the value
+  - Settings menu now correctly switches back to default provider
+
+- **Extension Disabled Search Fallback**: Fixed error when extension is disabled but still called
+
+  - `_performSearch` now checks if extension is still enabled before calling custom search
+  - Automatically falls back to Deezer/Spotify search if extension was disabled
+  - Clears `searchProvider` setting if extension no longer available
+
+- **Store Tab Unmount Crash**: Fixed "Using ref when widget is unmounted" error
+
+  - Added `mounted` check after async operation in `_initialize()`
+  - Prevents crash when navigating away from Store tab during initialization
+
+- **EXISTS: Prefix in File Path**: Fixed "File not found" error in metadata screen after download
+
+  - Duplicate detection was adding `EXISTS:` prefix to file paths
+  - Prefix now stripped before saving to download history
+  - Legacy history items with prefix are handled gracefully
+
+- **History Error Badge**: Fixed error badge showing on history items even when file exists
+
+  - `queue_tab.dart` now strips `EXISTS:` prefix before checking file existence
+  - File open and delete operations also use cleaned path
+
+- **Extension Artist URL Handler**: Fixed artist pages showing "0 releases" from extensions
+
+  - Extension `fetchArtist` now returns correct format: `{ type: "artist", artist: { albums } }`
+  - Go backend `HandleURLWithExtensionJSON` now includes albums in artist response
+  - Added `AlbumType` field to `ExtAlbumMetadata` struct
+
+- **Extension Artist Name in Logs**: Fixed empty artist name in extension track logs
+
+  - Now uses `firstArtist` + `otherArtists` instead of deprecated `artists.items`
+  - Logs correctly show "Fetched track: {title} by {artist}"
+
+- **Japanese Artist Name Order**: Fixed artist mismatch for Japanese names with different order
+
+  - "Sawano Hiroyuki" vs "Hiroyuki Sawano" now correctly matches
+  - Added `sameWordsUnordered` check to both Tidal and Qobuz artist matching
+  - Handles Japanese name order (family name first) vs Western name order (given name first)
+
+- **Multi-Artist Matching**: Fixed artist mismatch for collaboration tracks
+
+  - "RADWIMPS feat. Toko Miura" now matches when Qobuz/Tidal only shows "Toko Miura"
+  - Split artists by separators (`, `, `feat.`, `ft.`, `&`, `and`, `x`)
+  - Match if ANY expected artist matches ANY found artist
+
+- **Cover Download Logging**: Improved cover download logs for debugging
+  - Shows original URL, upgrade steps, and final URL
+  - Displays estimated resolution based on file size
+  - Logs now appear in Settings > Logs via GoLog
+
+---
+
+## [3.0.0-beta.1] - 2026-01-13
+
+### Security
+
+- Improved extension sandbox security
+- Improved credential encryption with per-installation random salt
+
+### Changed
+
+- **Extension Manifest**: New `file` permission required for file operations
+  ```json
+  "permissions": {
+    "network": ["api.example.com"],
+    "storage": true,
+    "file": true
+  }
+  ```
+  Extensions that need to download files must declare `"file": true` in manifest.
+
+### Fixed
+
+- Extension packages now preserve directory structure (subdirectories supported)
+- Back gesture freeze in settings pages on Android gesture navigation
+
+---
+
+## [3.0.0-alpha.4] - 2026-01-12
+
+### Added
+
+- **Extension Store**: Browse and install extensions directly from the app
+
+  - New "Store" tab in bottom navigation
+  - Browse extensions by category (Metadata, Download, Utility, Lyrics, Integration)
+  - Search extensions by name, description, or tags
+  - One-tap install and update
+  - Offline cache for browsing without internet
+  - Extensions hosted at github.com/zarzet/SpotiFLAC-Extension
+
+- **Custom URL Handler for Extensions**: Extensions can now register custom URL patterns
+
+  - Handle URLs from YouTube Music, SoundCloud, Bandcamp, etc.
+  - Manifest config: `urlHandler: { enabled: true, patterns: ["music.youtube.com"] }`
+  - Implement `handleUrl(url)` function in extension to parse and return track metadata
+  - SpotiFLAC automatically routes matching URLs to the appropriate extension
+  - Supports share intents and paste from clipboard
+
+- **Artist URL Handler Support**: Extensions can now return artist data from URL handlers
+
+  - Added `type: "artist"` handling in track_provider.dart
+  - Navigate to artist screen with albums list from extension
+
+- **HMAC-SHA1 Utility**: New `utils.hmacSHA1(key, message)` function for extensions
+  - Enables TOTP generation and other cryptographic operations
+  - Returns byte array for flexible use
+
+### Fixed
+
+- **Extension Store Refresh**: Store tab now properly refreshes after uninstalling an extension
+  - "Installed" badge correctly updates to "Install" button
+
+### Documentation
+
+- Updated `docs/EXTENSION_DEVELOPMENT.md`:
+  - Added Custom URL Handler section with examples
+  - Added `handleUrl` function documentation
+  - Added URL pattern examples for YouTube, SoundCloud, Bandcamp
+  - Added `utils.hmacSHA1` documentation with TOTP example
+
+### Extensions
+
+- **Spotify Web Extension** (example): New extension for Spotify metadata via web API
+  - Supports personalized playlists (Daily Mix, Discover Weekly, Release Radar, etc.)
+  - Search, album, playlist, track, and artist fetching
+  - Available in Extension Store (3.0.0-alpha.4)
+
+---
+
+## [3.0.0-alpha.3] - 2026-01-12
+
+### Added
+
+- **Separate Singles Folder**: Option to organize downloads into Albums/ and Singles/ folders
+  - Based on `album_type` from Spotify/Deezer metadata
+  - Toggle in Settings > Download > Separate Singles Folder
+  - Singles saved to `{output}/Singles/`, albums to `{output}/Albums/`
+- **Browser-like Polyfills**: New global APIs for easier library porting
+  - `fetch()` - Browser-compatible HTTP API with `json()`, `text()`, `arrayBuffer()` methods
+  - `atob()` / `btoa()` - Global Base64 encoding/decoding
+  - `TextEncoder` / `TextDecoder` - UTF-8 text encoding classes
+  - `URL` / `URLSearchParams` - URL parsing and manipulation classes
+  - Makes porting browser libraries (like `youtubei.js`) much easier
+
+### Performance
+
+- **Parallel API Calls**: Download URL fetching now uses parallel requests
+  - Tidal: All 8 APIs requested simultaneously, first success wins
+  - Qobuz: Both APIs requested simultaneously, first success wins
+  - Significantly reduces download URL fetch time
+
+### Fixed
+
+- **Duplicate History Entries**: Fixed duplicate entries when re-downloading same track
+  - Detects existing entries by Spotify ID, Deezer ID, or ISRC
+  - Replaces existing entry and moves to top of list
+  - Auto-deduplicates existing history on app load
+- **Extension Search Fallback**: Fixed error when extension is disabled but still called for search
+  - Now checks if extension is still enabled before calling custom search
+  - Auto-resets search provider to default if extension was disabled
+- **Permission Error Message**: Fixed download showing "Song not found" when actually a permission error
+  - Now shows proper message: "Cannot write to folder, check storage permission"
+  - Added `permission` error type detection in backend
+- **Android 13+ Storage Permission**: Fixed storage permission not working on Android 13+
+  - Android 13+ now requests both `MANAGE_EXTERNAL_STORAGE` and `READ_MEDIA_AUDIO`
+  - `MANAGE_EXTERNAL_STORAGE` opens Settings (system-level, persists across app data clear)
+  - `READ_MEDIA_AUDIO` shows dialog (app-level, resets on app data clear)
+  - Proper permission check before showing "granted" status
+
+---
+
+## [3.0.0-alpha.2] - 2026-01-12
+
+### Added
+
+- **Full HTTP Method Support**: New shortcut methods for all common HTTP verbs
+  - `http.put(url, body, headers)` - PUT requests
+  - `http.delete(url, headers)` - DELETE requests
+  - `http.patch(url, body, headers)` - PATCH requests
+  - `http.clearCookies()` - Clear all cookies for the extension
+- **Persistent Cookie Jar**: Each extension now has its own cookie jar
+  - Cookies automatically stored from `Set-Cookie` headers
+  - Cookies automatically sent with subsequent requests to same domain
+  - Useful for APIs requiring session cookies (YouTube, etc.)
+- **Multi-Value Header Support**: Response headers now return arrays for multi-value headers
+  - `Set-Cookie` and other headers with multiple values returned as arrays
+  - Single-value headers still returned as strings for convenience
+- **Generic HTTP Request Method**: New `http.request()` for full HTTP control
+  - Supports all HTTP methods (GET, POST, PUT, DELETE, PATCH, etc.)
+  - Single options object for cleaner API: `http.request(url, { method, body, headers })`
+- **Response Helper Properties**: HTTP responses now include convenience properties
+  - `response.ok` - true if status code is 2xx
+  - `response.status` - alias for `statusCode`
+
+### Fixed
+
+- **User-Agent Header Respect**: Custom `User-Agent` headers are now respected
+  - Previously, extension-provided User-Agent was overwritten
+  - Now only sets default User-Agent if extension doesn't provide one
+- **HTTP POST Body Auto-Stringify**: `http.post()` now automatically stringifies objects to JSON
+  - Previously, passing an object as body resulted in `[object Object]`
+  - Now objects and arrays are automatically JSON.stringify'd
+  - String bodies still work as before (no double-encoding)
+
+### Documentation
+
+- Updated `docs/EXTENSION_DEVELOPMENT.md`:
+  - Added complete HTTP API documentation with all methods
+  - Added Cookie Jar documentation
+  - Added `http.put()`, `http.delete()`, `http.patch()`, `http.clearCookies()` docs
+  - Added YouTube Music / Innertube API example with custom User-Agent
+  - Added common domain lists for YouTube, SoundCloud, Bandcamp
+  - Improved HTTP API documentation with response properties
+
+---
+
+## [3.0.0-alpha.1] - 2026-01-11
+
+#### Extension System
+
+- **Custom Search Providers**: Extensions can now provide custom search functionality
+  - YouTube, SoundCloud, and other platforms via extensions
+  - Custom search placeholder text per extension
+  - Configurable thumbnail aspect ratios (square, wide, portrait)
+- **Extension Upgrade System**: Upgrade extensions without losing data
+  - Preserves extension settings and cached data during upgrades
+  - Version comparison prevents downgrades
+  - Auto-detects upgrades when installing same extension
+- **Custom Thumbnail Ratios**: Extensions can specify thumbnail display format
+  - `"square"` (1:1) - Album art style (default)
+  - `"wide"` (16:9) - YouTube/video style
+  - `"portrait"` (2:3) - Poster style
+  - Custom width/height override available
+
+### Added
+
+- **Track Source Tracking**: Tracks now remember which extension provided them
+  - `Track.source` field stores extension ID
+  - `TrackState.searchExtensionId` for current search context
+  - Enables extension-specific UI customization
+- **Extension Upgrade API**: New methods for extension management
+  - `upgradeExtension(filePath)` - Upgrade existing extension
+  - `checkExtensionUpgrade(filePath)` - Check if file is an upgrade
+  - `RemoveExtensionByID` - Remove extension by ID
+- **iOS Extension Support**: Added missing iOS method handlers
+  - `upgradeExtension` - Upgrade extension from file
+  - `checkExtensionUpgrade` - Check upgrade compatibility
+- **Extension Documentation**: Comprehensive extension development guide
+  - Thumbnail ratio customization documentation
+  - Extension upgrade workflow documentation
+  - New troubleshooting entries for common issues
+
+### Changed
+
+- **Version Bump**: 2.2.7 → 3.0.0-alpha.1 (major version for extension system)
+- **Build Number**: 49 → 50
+- **Extension Manager**: Improved upgrade detection in `LoadExtensionFromFile`
+  - Auto-detects if installing same extension with higher version
+  - Calls `UpgradeExtension` automatically for seamless upgrades
+
+### Fixed
+
+- **Extension `registerExtension`**: Fixed global `extension` variable not being set
+  - Extensions can now access their own functions via `extension.functionName()`
+  - Required for `customSearch` and other provider functions
+- **Custom Search Empty Results**: Fixed error when extension returns null
+  - Now returns empty array instead of error
+  - Prevents crash when no results found
+- **Mutex Crash on Upgrade**: Fixed "Unlock of unlocked RWMutex" crash
+  - Removed `defer m.mu.Unlock()` when manual unlock is used
+  - Proper lock handling in upgrade flow
+- **Duplicate Error Messages**: Fixed extension install errors showing twice
+  - Added `clearError()` method to extension provider
+  - Improved PlatformException parsing to remove "null, null" artifacts
+- **Extension Images Field**: Fixed thumbnails not showing in search results
+  - Added `Images` field to `ExtTrackMetadata` struct
+  - Renamed `GetCoverURL` to `ResolvedCoverURL` (gomobile conflict)
+
+### Technical
+
+- **Go Backend Changes**:
+  - `go_backend/extension_manager.go`: Added `compareVersions()`, `UpgradeExtension()`, `CheckExtensionUpgradeJSON()`
+  - `go_backend/extension_providers.go`: Added `Images` field, `ResolvedCoverURL()` method
+  - `go_backend/extension_manifest.go`: Added `ThumbnailRatio`, `ThumbnailWidth`, `ThumbnailHeight` to `SearchBehaviorConfig`
+  - `go_backend/exports.go`: Added `RemoveExtensionByID`, `UpgradeExtensionFromPath`, `CheckExtensionUpgradeFromPath`
+- **Flutter Changes**:
+  - `lib/models/track.dart`: Added `source` field
+  - `lib/models/track.g.dart`: Updated for `source` field
+  - `lib/providers/track_provider.dart`: Added `searchExtensionId`, updated `_parseSearchTrack` with source parameter
+  - `lib/providers/extension_provider.dart`: Added `SearchBehavior.getThumbnailSize()`, `clearError()`
+  - `lib/screens/home_tab.dart`: Dynamic thumbnail size based on extension config
+  - `lib/screens/settings/extensions_page.dart`: Improved error handling
+  - `lib/services/platform_bridge.dart`: Added `upgradeExtension()`, `checkExtensionUpgrade()`, `removeExtension()`
+- **iOS Changes**:
+  - `ios/Runner/AppDelegate.swift`: Added `upgradeExtension`, `checkExtensionUpgrade` handlers
+- **Android Changes**:
+  - `android/app/src/main/kotlin/com/zarz/spotiflac/MainActivity.kt`: Already had upgrade methods
+
+---
+
+## [2.2.8] - 2026-01-12
+
+### Added
+
+- **Multi-Select Batch Delete**: Long-press tracks in History to enter selection mode
+  - Select multiple tracks at once
+  - "Select All" and "Delete Selected" actions
+  - Modern Material 3 bottom action bar (slides up from bottom)
+  - Works in both grid and list view modes
+- **History Filter Tabs**: Filter history by All/Albums/Singles
+  - Album = tracks where album has >1 track in history
+  - Single = tracks where album has only 1 track in history
+  - Filter chips show counts for each category
+- **Album Grouping View**: When "Albums" filter is selected, tracks are grouped by album
+  - Album cards displayed in 2-column grid with cover art and track count badge
+  - Tap album to open dedicated album detail screen
+  - Album detail shows all downloaded tracks from that album
+  - Multi-select delete support within album view
+  - Auto-navigates back when album has <2 tracks remaining
+
+### Changed
+
+- **Issue Templates**: Updated version confirmation checkbox to specify "(Stable Version)"
+
+---
+
+## [2.2.7] - 2026-01-11
+
+### Added
+
+- **CSV Import Metadata Enrichment**: Tracks imported from CSV now automatically fetch metadata from Deezer
+  - Cover art, duration, track/disc number fetched via ISRC lookup
+  - Fallback to text search (artist + track name) when ISRC not found in Deezer
+  - Progress dialog shows enrichment status during import
+  - Ensures downloaded files have proper cover art and metadata
+- **Deezer Metadata Support**: Enhanced metadata viewer for Deezer tracks
+  - "Open in Deezer" button for Deezer-sourced tracks (opens app or web)
+  - Displays "Deezer ID" instead of "Spotify ID" when applicable
+- **Smart Tag Injection**: Filename format editor intelligently handles separators
+  - Auto-detects if " - " is needed between tags
+  - Prevents double separators or missing spaces
+- **Dynamic Source Info**: Search source selector now shows helpful context
+  - "No login required" for Deezer
+  - "Requires credentials" for Spotify
+
+### Changed
+
+- **UI Modernization**: Major UI consistency updates across the app
+  - **Unified App Bars**: Home, History, and Settings now share identical behavior
+    - Lowered expanded header for easier one-handed reachability
+    - Dynamic title text scaling (20px to 34px)
+  - **Appearance Settings**: Completely redesigned appearance page
+    - New "Theme Preview" card showing visualizing current theme
+    - Modern color palette picker replacing old color dots
+    - Clean, grouped layout
+    - "AMOLED Dark" switch is now hidden when using Light Mode
+  - **App Logo**: Refined logo style on Home and About screens
+    - Inverted colors: Filled primary color circle with on-color icon
+    - Removed padding for a cleaner, bolder look
+  - **Material 3 Switches**: Added checkmark icon to active switches
+- **UI Modernization (Global)**: Complete design refresh for a cleaner, modern look
+  - **Rounded Corners**: Standardized 16px radius for all cards, buttons, and input fields
+  - **Transparent Elements**: Applied subtle transparency to input fields and containers using `surfaceContainerHighest`
+  - **Consistent Buttons**: Unified button styling across the app (pill shape, 16px radius)
+- **Options Settings Redesign**: improved layout and usability
+  - **Search Source Priority**: Moved "Search Source" section to the very top for quick access
+  - **Compact Source Selector**: Redesigned provider toggle (Deezer/Spotify) to be compact and consistent
+  - **Credentials Workflow**: Reorganized Custom Credentials settings; toggle now auto-prompts if credentials missing
+  - **Modern Credentials Dialog**: Totally redesigned input dialog for Spotify Client ID/Secret
+- **Filename Format Editor 2.0**:
+  - **Modern Sheet UI**: Replaced legacy dialog with a clean, full-width bottom sheet
+  - **Tag Chips**: Added clickable chips ({artist}, {title}) for one-tap insertion
+  - **Smart Formatting**: Automatically injects separators (" - ") when adding tags for faster editing
+
+### Fixed
+
+- **CSV Import Missing Cover Art**: Fixed tracks from CSV having no cover art in download history
+  - Cover URL now properly fetched from Deezer during enrichment
+  - Falls back to text search when ISRC lookup fails
+- **CSV Import Missing Duration**: Fixed duration showing 0:00 for CSV-imported tracks
+  - Duration now fetched from Deezer metadata during enrichment
+- **Disc Number Not Displayed**: Fixed disc number not showing in track metadata screen
+  - Changed condition from `discNumber > 0` to `discNumber > 0`
+  - Now displays disc 1 instead of hiding it
+- **Download History Using Wrong Track Data**: Fixed history using original CSV data instead of enriched data
+  - Now uses `trackToDownload` (enriched) instead of `item.track` (original)
+
+### Technical
+
+- Updated `lib/services/csv_import_service.dart`:
+  - Added `_enrichTracksMetadata()` with ISRC lookup + text search fallback
+  - Added progress callback for UI feedback
+- Updated `lib/screens/home_tab.dart`:
+  - Added progress dialog during CSV enrichment
+- Updated `lib/providers/download_queue_provider.dart`:
+  - Uses enriched track data for download history
+- Updated `lib/screens/track_metadata_screen.dart`:
+  - Show disc number when > 0 (was > 1)
+- Updated `go_backend/metadata.go`:
+  - Added `TotalSamples` to `AudioQuality` struct for duration calculation
+- Updated `go_backend/exports.go`:
+  - `ReadFileMetadata` now returns duration calculated from FLAC stream info
+- Updated `AppTheme` with new `InputDecorationTheme` and `ButtonTheme` definitions
+- Refactored `DownloadSettingsPage` to use new `_showFormatEditor` with cursor-aware capabilities
+- Optimized various dialogs to use `showModalBottomSheet` with `isScrollControlled` for better keyboard handling
+
+---
+
+## [2.2.6] - 2026-01-11
+
+### Fixed
+
+- **Release Mode Logging**: Flutter app logs now properly captured in release builds
+  - Previously only Go backend logs appeared when "Detailed Logging" was enabled
+  - Now both Flutter and Go logs are captured in release mode
+  - Bypasses Logger package which filters logs in release mode
+
+### Added
+
+- **Detailed Deezer Search Logging**: Better debugging for search issues
+  - Logs API URLs, response counts, and errors
+  - Helps diagnose geo-restriction and API issues
+  - Detects Deezer API error responses
+
+### Changed
+
+- **Home Screen Logo**: Replaced music note icon with app logo
+  - Uses `assets/images/logo.png`
+  - Rounded corners (24px radius)
+  - Fallback to music note icon if logo fails to load
+- **About Page Logo**: Removed shadow/border from logo
+  - Cleaner appearance without background container
+- **About Page Icon Alignment**: Icons now aligned with contributor avatars
+  - DoubleDouble and DAB Music icons use 40x40 area
+  - Text now properly aligned with contributor items
+
+## [2.2.5] - 2026-01-10
+
+### Added
+
+- **In-App Log Viewer with Go Backend Logs**: Complete logging system for debugging
+  - Go backend logs now captured and displayed in app
+  - Circular buffer stores up to 500 log entries
+  - Real-time polling (500ms) for Go backend logs
+  - Logs include timestamp, level, tag, and message
+  - "Go" badge indicates logs from backend
+- **Detailed Logging Toggle**: Control logging in Settings > Options > Debug
+  - Disabled by default for performance
+  - Errors are always logged regardless of setting
+  - Enable before reproducing bugs for detailed logs
+- **Log Issue Summary**: Automatic detection of common issues in logs
+  - ISP Blocking detection with affected domains
+  - Rate limiting detection
+  - Network error detection
+  - Track not found detection
+  - Shows suggestions for each issue type
+- **ISP Blocking Detection**: Detects when ISP blocks download services
+  - DNS resolution failure detection
+  - Connection reset/refused detection
+  - TLS handshake failure detection
+  - HTTP 403/451 blocking page detection
+  - Suggests VPN or DNS change (1.1.1.1 / 8.8.8.8)
+
+### Fixed
+
+- **Artist Profile Placeholder**: Shows person icon when artist has no profile image
+  - Validates image URL before loading
+  - Fallback icon on load error
+- **Latin Extended Character Detection**: Fixed wrong track downloads for Polish, Czech, French, Spanish songs
+  - Characters like Ł, ę, ć, ñ, é now correctly treated as Latin script
+  - Previously treated as "different script" causing false matches
+  - Affects both Tidal and Qobuz search
+
+### Changed
+
+- **Log Screen UI Improvements**:
+  - Copy button moved to app bar (left of menu)
+  - Removed redundant info card
+  - Cleaner interface
+- **Issue Templates Updated**: Instructions for enabling detailed logging before submitting bug reports
+
+### Technical
+
+- New file: `go_backend/logbuffer.go` with circular buffer and GoLog function
+- Updated `go_backend/httputil.go` with ISP blocking detection
+- Updated `go_backend/tidal.go` and `go_backend/qobuz.go` with `isLatinScript()` function
+- Updated `lib/utils/logger.dart` with Go log polling
+- Updated `lib/screens/settings/log_screen.dart` with issue summary
+- Added method channel handlers for logging in Android and iOS
+- New error type: `isp_blocked` for ISP blocking errors
+
+---
+
 ## [2.2.0] - 2026-01-10

 ### Fixed
@@ -1,5 +1,5 @@
 [![GitHub All Releases](https://img.shields.io/github/downloads/zarzet/SpotiFLAC-Mobile/total?style=for-the-badge)](https://github.com/zarzet/SpotiFLAC-Mobile/releases)
-[![VirusTotal](https://img.shields.io/badge/VirusTotal-Safe-brightgreen?style=for-the-badge&logo=virustotal)](https://www.virustotal.com/gui/file/cb87d23fc9fd4a6f0a7b2b934773029c7e7ab25101dfce503e68e9c9e8921fca/)
+[![VirusTotal](https://img.shields.io/badge/VirusTotal-Safe-brightgreen?style=for-the-badge&logo=virustotal)](https://www.virustotal.com/gui/file/09c6260e9ebaf2ff0d15f30deda939642f41887f11aad602ac697cb37fa0308c/)

 <div align="center">

@@ -40,6 +40,20 @@ To use Spotify as your search source without hitting rate limits:
 4. Enter your Client ID and Secret
 5. Change **Search Source** to Spotify

+## Extensions
+
+Extensions allow the community to add new music sources and features without waiting for app updates. When a streaming service API changes or a new source becomes available, extensions can be updated independently.
+
+### Installing Extensions
+1. Go to **Store** tab in the app
+2. Browse and install extensions with one tap
+3. Or download a `.spotiflac-ext` file and install manually via **Settings > Extensions**
+4. Configure extension settings if needed
+5. Set provider priority in **Settings > Extensions > Provider Priority**
+
+### Developing Extensions
+Want to create your own extension? Check out the [Extension Development Guide](https://zarz.moe/docs) for complete documentation.
+
 ## Other project

 ### [SpotiFLAC (Desktop)](https://github.com/afkarxyz/SpotiFLAC)
@@ -49,8 +63,6 @@ Get Spotify tracks in true FLAC from Tidal, Qobuz & Amazon Music for Windows, ma

 ## Disclaimer

-> **iOS Support**: This app is primarily tested on Android. iOS support is experimental and may have bugs — the developer is too poor to afford an iPhone for proper testing. If you encounter issues on iOS, please report them!
-
 This project is for **educational and private use only**. The developer does not condone or encourage copyright infringement.

 **SpotiFLAC** is a third-party tool and is not affiliated with, endorsed by, or connected to Spotify, Tidal, Qobuz, Amazon Music, or any other streaming service.
@@ -46,7 +46,7 @@ android {
    defaultConfig {
        applicationId = "com.zarz.spotiflac"
        minSdk = flutter.minSdkVersion
-        targetSdk = 34
+        targetSdk = 36
        versionCode = flutter.versionCode
        versionName = flutter.versionName
        multiDexEnabled = true
@@ -15,6 +15,9 @@ import androidx.core.app.NotificationCompat
 /**
 * Foreground service to keep downloads running when app is in background.
 * This prevents Android from killing the download process or throttling network.
+ * 
+ * Note: Android 15+ (API 35+) has a 6-hour timeout for dataSync foreground services.
+ * The service will be stopped automatically after 6 hours of cumulative runtime in 24 hours.
 */
 class DownloadService : Service() {
    
@@ -106,6 +109,19 @@ class DownloadService : Service() {
    
    override fun onBind(intent: Intent?): IBinder? = null
    
+    /**
+     * Called when the foreground service timeout is reached (Android 15+, API 35+).
+     * dataSync services have a 6-hour limit in a 24-hour period.
+     * We must call stopSelf() within a few seconds to avoid a crash.
+     */
+    override fun onTimeout(startId: Int, fgsType: Int) {
+        // Log the timeout for debugging
+        android.util.Log.w("DownloadService", "Foreground service timeout reached (6 hours limit). Stopping service.")
+        
+        // Gracefully stop the service
+        stopForegroundService()
+    }
+    
    private fun createNotificationChannel() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val channel = NotificationChannel(
@@ -218,6 +218,12 @@ class MainActivity: FlutterActivity() {
                            }
                            result.success(null)
                        }
+                        "hasSpotifyCredentials" -> {
+                            val hasCredentials = withContext(Dispatchers.IO) {
+                                Gobackend.checkSpotifyCredentials()
+                            }
+                            result.success(hasCredentials)
+                        }
                        "preWarmTrackCache" -> {
                            val tracksJson = call.argument<String>("tracks") ?: "[]"
                            withContext(Dispatchers.IO) {
@@ -284,6 +290,346 @@ class MainActivity: FlutterActivity() {
                            }
                            result.success(response)
                        }
+                        // Log methods
+                        "getLogs" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getLogs()
+                            }
+                            result.success(response)
+                        }
+                        "getLogsSince" -> {
+                            val index = call.argument<Int>("index") ?: 0
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getLogsSince(index.toLong())
+                            }
+                            result.success(response)
+                        }
+                        "clearLogs" -> {
+                            withContext(Dispatchers.IO) {
+                                Gobackend.clearLogs()
+                            }
+                            result.success(null)
+                        }
+                        "getLogCount" -> {
+                            val count = withContext(Dispatchers.IO) {
+                                Gobackend.getLogCount()
+                            }
+                            result.success(count.toInt())
+                        }
+                        "setLoggingEnabled" -> {
+                            val enabled = call.argument<Boolean>("enabled") ?: false
+                            withContext(Dispatchers.IO) {
+                                Gobackend.setLoggingEnabled(enabled)
+                            }
+                            result.success(null)
+                        }
+                        // Extension System methods
+                        "initExtensionSystem" -> {
+                            val extensionsDir = call.argument<String>("extensions_dir") ?: ""
+                            val dataDir = call.argument<String>("data_dir") ?: ""
+                            withContext(Dispatchers.IO) {
+                                Gobackend.initExtensionSystem(extensionsDir, dataDir)
+                            }
+                            result.success(null)
+                        }
+                        "loadExtensionsFromDir" -> {
+                            val dirPath = call.argument<String>("dir_path") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.loadExtensionsFromDir(dirPath)
+                            }
+                            result.success(response)
+                        }
+                        "loadExtensionFromPath" -> {
+                            val filePath = call.argument<String>("file_path") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.loadExtensionFromPath(filePath)
+                            }
+                            result.success(response)
+                        }
+                        "unloadExtension" -> {
+                            val extensionId = call.argument<String>("extension_id") ?: ""
+                            withContext(Dispatchers.IO) {
+                                Gobackend.unloadExtensionByID(extensionId)
+                            }
+                            result.success(null)
+                        }
+                        "removeExtension" -> {
+                            val extensionId = call.argument<String>("extension_id") ?: ""
+                            withContext(Dispatchers.IO) {
+                                Gobackend.removeExtensionByID(extensionId)
+                            }
+                            result.success(null)
+                        }
+                        "upgradeExtension" -> {
+                            val filePath = call.argument<String>("file_path") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.upgradeExtensionFromPath(filePath)
+                            }
+                            result.success(response)
+                        }
+                        "checkExtensionUpgrade" -> {
+                            val filePath = call.argument<String>("file_path") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.checkExtensionUpgradeFromPath(filePath)
+                            }
+                            result.success(response)
+                        }
+                        "getInstalledExtensions" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getInstalledExtensions()
+                            }
+                            result.success(response)
+                        }
+                        "setExtensionEnabled" -> {
+                            val extensionId = call.argument<String>("extension_id") ?: ""
+                            val enabled = call.argument<Boolean>("enabled") ?: false
+                            withContext(Dispatchers.IO) {
+                                Gobackend.setExtensionEnabledByID(extensionId, enabled)
+                            }
+                            result.success(null)
+                        }
+                        "setProviderPriority" -> {
+                            val priorityJson = call.argument<String>("priority") ?: "[]"
+                            withContext(Dispatchers.IO) {
+                                Gobackend.setProviderPriorityJSON(priorityJson)
+                            }
+                            result.success(null)
+                        }
+                        "getProviderPriority" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getProviderPriorityJSON()
+                            }
+                            result.success(response)
+                        }
+                        "setMetadataProviderPriority" -> {
+                            val priorityJson = call.argument<String>("priority") ?: "[]"
+                            withContext(Dispatchers.IO) {
+                                Gobackend.setMetadataProviderPriorityJSON(priorityJson)
+                            }
+                            result.success(null)
+                        }
+                        "getMetadataProviderPriority" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getMetadataProviderPriorityJSON()
+                            }
+                            result.success(response)
+                        }
+                        "getExtensionSettings" -> {
+                            val extensionId = call.argument<String>("extension_id") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getExtensionSettingsJSON(extensionId)
+                            }
+                            result.success(response)
+                        }
+                        "setExtensionSettings" -> {
+                            val extensionId = call.argument<String>("extension_id") ?: ""
+                            val settingsJson = call.argument<String>("settings") ?: "{}"
+                            withContext(Dispatchers.IO) {
+                                Gobackend.setExtensionSettingsJSON(extensionId, settingsJson)
+                            }
+                            result.success(null)
+                        }
+                        "searchTracksWithExtensions" -> {
+                            val query = call.argument<String>("query") ?: ""
+                            val limit = call.argument<Int>("limit") ?: 20
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.searchTracksWithExtensionsJSON(query, limit.toLong())
+                            }
+                            result.success(response)
+                        }
+                        "downloadWithExtensions" -> {
+                            val requestJson = call.arguments as String
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.downloadWithExtensionsJSON(requestJson)
+                            }
+                            result.success(response)
+                        }
+                        "removeExtension" -> {
+                            val extensionId = call.argument<String>("extension_id") ?: ""
+                            withContext(Dispatchers.IO) {
+                                Gobackend.removeExtensionByID(extensionId)
+                            }
+                            result.success(null)
+                        }
+                        "cleanupExtensions" -> {
+                            withContext(Dispatchers.IO) {
+                                Gobackend.cleanupExtensions()
+                            }
+                            result.success(null)
+                        }
+                        // Extension Auth API methods
+                        "getExtensionPendingAuth" -> {
+                            val extensionId = call.argument<String>("extension_id") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getExtensionPendingAuthJSON(extensionId)
+                            }
+                            if (response.isNullOrEmpty()) {
+                                result.success(null)
+                            } else {
+                                result.success(response)
+                            }
+                        }
+                        "setExtensionAuthCode" -> {
+                            val extensionId = call.argument<String>("extension_id") ?: ""
+                            val authCode = call.argument<String>("auth_code") ?: ""
+                            withContext(Dispatchers.IO) {
+                                Gobackend.setExtensionAuthCodeByID(extensionId, authCode)
+                            }
+                            result.success(null)
+                        }
+                        "setExtensionTokens" -> {
+                            val extensionId = call.argument<String>("extension_id") ?: ""
+                            val accessToken = call.argument<String>("access_token") ?: ""
+                            val refreshToken = call.argument<String>("refresh_token") ?: ""
+                            val expiresIn = call.argument<Int>("expires_in") ?: 0
+                            withContext(Dispatchers.IO) {
+                                Gobackend.setExtensionTokensByID(extensionId, accessToken, refreshToken, expiresIn.toLong())
+                            }
+                            result.success(null)
+                        }
+                        "clearExtensionPendingAuth" -> {
+                            val extensionId = call.argument<String>("extension_id") ?: ""
+                            withContext(Dispatchers.IO) {
+                                Gobackend.clearExtensionPendingAuthByID(extensionId)
+                            }
+                            result.success(null)
+                        }
+                        "isExtensionAuthenticated" -> {
+                            val extensionId = call.argument<String>("extension_id") ?: ""
+                            val isAuth = withContext(Dispatchers.IO) {
+                                Gobackend.isExtensionAuthenticatedByID(extensionId)
+                            }
+                            result.success(isAuth)
+                        }
+                        "getAllPendingAuthRequests" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getAllPendingAuthRequestsJSON()
+                            }
+                            result.success(response)
+                        }
+                        // Extension FFmpeg API
+                        "getPendingFFmpegCommand" -> {
+                            val commandId = call.argument<String>("command_id") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getPendingFFmpegCommandJSON(commandId)
+                            }
+                            if (response.isNullOrEmpty()) {
+                                result.success(null)
+                            } else {
+                                result.success(response)
+                            }
+                        }
+                        "setFFmpegCommandResult" -> {
+                            val commandId = call.argument<String>("command_id") ?: ""
+                            val success = call.argument<Boolean>("success") ?: false
+                            val output = call.argument<String>("output") ?: ""
+                            val error = call.argument<String>("error") ?: ""
+                            withContext(Dispatchers.IO) {
+                                Gobackend.setFFmpegCommandResultByID(commandId, success, output, error)
+                            }
+                            result.success(null)
+                        }
+                        "getAllPendingFFmpegCommands" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getAllPendingFFmpegCommandsJSON()
+                            }
+                            result.success(response)
+                        }
+                        // Extension Custom Search API
+                        "customSearchWithExtension" -> {
+                            val extensionId = call.argument<String>("extension_id") ?: ""
+                            val query = call.argument<String>("query") ?: ""
+                            val optionsJson = call.argument<String>("options") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.customSearchWithExtensionJSON(extensionId, query, optionsJson)
+                            }
+                            result.success(response)
+                        }
+                        "getSearchProviders" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getSearchProvidersJSON()
+                            }
+                            result.success(response)
+                        }
+                        // Extension URL Handler API
+                        "handleURLWithExtension" -> {
+                            val url = call.argument<String>("url") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.handleURLWithExtensionJSON(url)
+                            }
+                            result.success(response)
+                        }
+                        "findURLHandler" -> {
+                            val url = call.argument<String>("url") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.findURLHandlerJSON(url)
+                            }
+                            result.success(response)
+                        }
+                        "getURLHandlers" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getURLHandlersJSON()
+                            }
+                            result.success(response)
+                        }
+                        // Extension Post-Processing API
+                        "runPostProcessing" -> {
+                            val filePath = call.argument<String>("file_path") ?: ""
+                            val metadataJson = call.argument<String>("metadata") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.runPostProcessingJSON(filePath, metadataJson)
+                            }
+                            result.success(response)
+                        }
+                        "getPostProcessingProviders" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getPostProcessingProvidersJSON()
+                            }
+                            result.success(response)
+                        }
+                        // Extension Store
+                        "initExtensionStore" -> {
+                            val cacheDir = call.argument<String>("cache_dir") ?: ""
+                            withContext(Dispatchers.IO) {
+                                Gobackend.initExtensionStoreJSON(cacheDir)
+                            }
+                            result.success(null)
+                        }
+                        "getStoreExtensions" -> {
+                            val forceRefresh = call.argument<Boolean>("force_refresh") ?: false
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getStoreExtensionsJSON(forceRefresh)
+                            }
+                            result.success(response)
+                        }
+                        "searchStoreExtensions" -> {
+                            val query = call.argument<String>("query") ?: ""
+                            val category = call.argument<String>("category") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.searchStoreExtensionsJSON(query, category)
+                            }
+                            result.success(response)
+                        }
+                        "getStoreCategories" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.getStoreCategoriesJSON()
+                            }
+                            result.success(response)
+                        }
+                        "downloadStoreExtension" -> {
+                            val extensionId = call.argument<String>("extension_id") ?: ""
+                            val destDir = call.argument<String>("dest_dir") ?: ""
+                            val response = withContext(Dispatchers.IO) {
+                                Gobackend.downloadStoreExtensionJSON(extensionId, destDir)
+                            }
+                            result.success(response)
+                        }
+                        "clearStoreCache" -> {
+                            withContext(Dispatchers.IO) {
+                                Gobackend.clearStoreCacheJSON()
+                            }
+                            result.success(null)
+                        }
                        else -> result.notImplemented()
                    }
                } catch (e: Exception) {
@@ -88,7 +88,7 @@ func amazonArtistsMatch(expectedArtist, foundArtist string) bool {
 	expectedASCII := amazonIsASCIIString(expectedArtist)
 	foundASCII := amazonIsASCIIString(foundArtist)
 	if expectedASCII != foundASCII {
-		fmt.Printf("[Amazon] Artist names in different scripts, assuming match: '%s' vs '%s'\n", expectedArtist, foundArtist)
+		GoLog("[Amazon] Artist names in different scripts, assuming match: '%s' vs '%s'\n", expectedArtist, foundArtist)
 		return true
 	}

@@ -135,7 +135,7 @@ func (a *AmazonDownloader) waitForRateLimit() {
 	if a.apiCallCount >= 9 {
 		waitTime := time.Minute - now.Sub(a.apiCallResetTime)
 		if waitTime > 0 {
-			fmt.Printf("[Amazon] Rate limit reached, waiting %v...\n", waitTime.Round(time.Second))
+			GoLog("[Amazon] Rate limit reached, waiting %v...\n", waitTime.Round(time.Second))
 			time.Sleep(waitTime)
 			a.apiCallCount = 0
 			a.apiCallResetTime = time.Now()
@@ -148,7 +148,7 @@ func (a *AmazonDownloader) waitForRateLimit() {
 		minDelay := 7 * time.Second
 		if timeSinceLastCall < minDelay {
 			waitTime := minDelay - timeSinceLastCall
-			fmt.Printf("[Amazon] Rate limiting: waiting %v...\n", waitTime.Round(time.Second))
+			GoLog("[Amazon] Rate limiting: waiting %v...\n", waitTime.Round(time.Second))
 			time.Sleep(waitTime)
 		}
 	}
@@ -173,11 +173,11 @@ func (a *AmazonDownloader) GetAvailableAPIs() []string {
 // downloadFromDoubleDoubleService downloads a track using DoubleDouble service (same as PC)
 // This uses submit → poll → download mechanism
 // Internal function - not exported to gomobile
-func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, outputDir string) (string, string, string, error) {
+func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, _ string) (string, string, string, error) {
 	var lastError error

 	for _, region := range a.regions {
-		fmt.Printf("[Amazon] Trying region: %s...\n", region)
+		GoLog("[Amazon] Trying region: %s...\n", region)

 		// Build base URL for DoubleDouble service
 		// Decode base64 service URL (same as PC)
@@ -216,7 +216,7 @@ func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, outputDir
 				resp.Body.Close()
 				if retry < maxRetries-1 {
 					waitTime := 15 * time.Second
-					fmt.Printf("[Amazon] Rate limited (429), waiting %v before retry %d/%d...\n", waitTime, retry+2, maxRetries)
+					GoLog("[Amazon] Rate limited (429), waiting %v before retry %d/%d...\n", waitTime, retry+2, maxRetries)
 					time.Sleep(waitTime)
 					continue
 				}
@@ -255,7 +255,7 @@ func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, outputDir
 		}

 		downloadID := submitResp.ID
-		fmt.Printf("[Amazon] Download ID: %s\n", downloadID)
+		GoLog("[Amazon] Download ID: %s\n", downloadID)

 		// Step 2: Poll for completion
 		statusURL := fmt.Sprintf("%s/dl/%s", baseURL, downloadID)
@@ -310,7 +310,7 @@ func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, outputDir
 				trackName := status.Current.Name
 				artist := status.Current.Artist

-				fmt.Printf("[Amazon] Downloading: %s - %s\n", artist, trackName)
+				GoLog("[Amazon] Downloading: %s - %s\n", artist, trackName)
 				return fileURL, trackName, artist, nil

 			} else if status.Status == "error" {
@@ -454,7 +454,7 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	if strings.HasPrefix(req.SpotifyID, "deezer:") {
 		// Extract Deezer ID and use Deezer-based lookup
 		deezerID := strings.TrimPrefix(req.SpotifyID, "deezer:")
-		fmt.Printf("[Amazon] Using Deezer ID for SongLink lookup: %s\n", deezerID)
+		GoLog("[Amazon] Using Deezer ID for SongLink lookup: %s\n", deezerID)
 		availability, err = songlink.CheckAvailabilityFromDeezer(deezerID)
 	} else if req.SpotifyID != "" {
 		// Use Spotify ID
@@ -486,12 +486,12 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {

 	// Verify artist matches
 	if artistName != "" && !amazonArtistsMatch(req.ArtistName, artistName) {
-		fmt.Printf("[Amazon] Artist mismatch: expected '%s', got '%s'. Rejecting.\n", req.ArtistName, artistName)
+		GoLog("[Amazon] Artist mismatch: expected '%s', got '%s'. Rejecting.\n", req.ArtistName, artistName)
 		return AmazonDownloadResult{}, fmt.Errorf("artist mismatch: expected '%s', got '%s'", req.ArtistName, artistName)
 	}

 	// Log match found
-	fmt.Printf("[Amazon] Match found: '%s' by '%s'\n", trackName, artistName)
+	GoLog("[Amazon] Match found: '%s' by '%s'\n", trackName, artistName)

 	// Build filename using Spotify metadata (more accurate)
 	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]interface{}{
@@ -542,7 +542,7 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {

 	// Log track info from DoubleDouble (for debugging)
 	if trackName != "" && artistName != "" {
-		fmt.Printf("[Amazon] DoubleDouble returned: %s - %s\n", artistName, trackName)
+		GoLog("[Amazon] DoubleDouble returned: %s - %s\n", artistName, trackName)
 	}

 	// Read existing metadata from downloaded file BEFORE embedding
@@ -555,11 +555,11 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		// Use file metadata if it has valid track/disc numbers and request doesn't have them
 		if existingMeta.TrackNumber > 0 && (req.TrackNumber == 0 || req.TrackNumber == 1) {
 			actualTrackNum = existingMeta.TrackNumber
-			fmt.Printf("[Amazon] Using track number from file: %d (request had: %d)\n", actualTrackNum, req.TrackNumber)
+			GoLog("[Amazon] Using track number from file: %d (request had: %d)\n", actualTrackNum, req.TrackNumber)
 		}
 		if existingMeta.DiscNumber > 0 && (req.DiscNumber == 0 || req.DiscNumber == 1) {
 			actualDiscNum = existingMeta.DiscNumber
-			fmt.Printf("[Amazon] Using disc number from file: %d (request had: %d)\n", actualDiscNum, req.DiscNumber)
+			GoLog("[Amazon] Using disc number from file: %d (request had: %d)\n", actualDiscNum, req.DiscNumber)
 		}
 	}

@@ -581,7 +581,7 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	var coverData []byte
 	if parallelResult != nil && parallelResult.CoverData != nil {
 		coverData = parallelResult.CoverData
-		fmt.Printf("[Amazon] Using parallel-fetched cover (%d bytes)\n", len(coverData))
+		GoLog("[Amazon] Using parallel-fetched cover (%d bytes)\n", len(coverData))
 	}

 	if err := EmbedMetadataWithCoverData(outputPath, metadata, coverData); err != nil {
@@ -590,9 +590,9 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {

 	// Embed lyrics from parallel fetch
 	if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
-		fmt.Printf("[Amazon] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
+		GoLog("[Amazon] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
 		if embedErr := EmbedLyrics(outputPath, parallelResult.LyricsLRC); embedErr != nil {
-			fmt.Printf("[Amazon] Warning: failed to embed lyrics: %v\n", embedErr)
+			GoLog("[Amazon] Warning: failed to embed lyrics: %v\n", embedErr)
 		} else {
 			fmt.Println("[Amazon] Lyrics embedded successfully")
 		}
@@ -606,16 +606,16 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	// Amazon API doesn't provide quality info, but we can read it from the file itself
 	quality, err := GetAudioQuality(outputPath)
 	if err != nil {
-		fmt.Printf("[Amazon] Warning: couldn't read quality from file: %v\n", err)
+		GoLog("[Amazon] Warning: couldn't read quality from file: %v\n", err)
 	} else {
-		fmt.Printf("[Amazon] Actual quality: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
+		GoLog("[Amazon] Actual quality: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
 	}

 	// Read metadata from file AFTER embedding to get accurate values
 	// This ensures we return what's actually in the file
 	finalMeta, metaReadErr := ReadMetadata(outputPath)
 	if metaReadErr == nil && finalMeta != nil {
-		fmt.Printf("[Amazon] Final metadata from file - Track: %d, Disc: %d, Date: %s\n",
+		GoLog("[Amazon] Final metadata from file - Track: %d, Disc: %d, Date: %s\n",
 			finalMeta.TrackNumber, finalMeta.DiscNumber, finalMeta.Date)
 		actualTrackNum = finalMeta.TrackNumber
 		actualDiscNum = finalMeta.DiscNumber
@@ -9,10 +9,20 @@ import (

 // Spotify image size codes (same as PC version)
 const (
-	spotifySize640 = "ab67616d0000b273" // 640x640
+	spotifySize300 = "ab67616d00001e02" // 300x300 (small)
+	spotifySize640 = "ab67616d0000b273" // 640x640 (medium)
 	spotifySizeMax = "ab67616d000082c1" // Max resolution (~2000x2000)
 )

+// convertSmallToMedium upgrades 300x300 cover URL to 640x640
+// Same logic as PC version for consistency
+func convertSmallToMedium(imageURL string) string {
+	if strings.Contains(imageURL, spotifySize300) {
+		return strings.Replace(imageURL, spotifySize300, spotifySize640, 1)
+	}
+	return imageURL
+}
+
 // downloadCoverToMemory downloads cover art and returns as bytes (no file creation)
 // This avoids file permission issues on Android
 func downloadCoverToMemory(coverURL string, maxQuality bool) ([]byte, error) {
@@ -20,17 +30,27 @@ func downloadCoverToMemory(coverURL string, maxQuality bool) ([]byte, error) {
 		return nil, fmt.Errorf("no cover URL provided")
 	}

-	fmt.Printf("[Cover] Downloading cover from: %s\n", coverURL)
+	GoLog("[Cover] Original URL: %s", coverURL)

-	// Upgrade to max quality if requested
-	downloadURL := coverURL
+	// First upgrade small (300) to medium (640) - always do this
+	downloadURL := convertSmallToMedium(coverURL)
+	if downloadURL != coverURL {
+		GoLog("[Cover] Upgraded 300x300 → 640x640")
+	}
+
+	// Then upgrade to max quality if requested
 	if maxQuality {
-		downloadURL = upgradeToMaxQuality(coverURL)
-		if downloadURL != coverURL {
-			fmt.Printf("[Cover] Upgraded to max quality URL: %s\n", downloadURL)
+		maxURL := upgradeToMaxQuality(downloadURL)
+		if maxURL != downloadURL {
+			downloadURL = maxURL
+			GoLog("[Cover] Upgraded to max resolution (~2000x2000)")
+		} else {
+			GoLog("[Cover] Max resolution not available, using 640x640")
 		}
 	}

+	GoLog("[Cover] Final URL: %s", downloadURL)
+
 	client := NewHTTPClientWithTimeout(DefaultTimeout)

 	// Create request with User-Agent (required by Spotify CDN)
@@ -54,12 +74,25 @@ func downloadCoverToMemory(coverURL string, maxQuality bool) ([]byte, error) {
 		return nil, fmt.Errorf("failed to read cover data: %w", err)
 	}

-	fmt.Printf("[Cover] Downloaded %d bytes\n", len(data))
+	// Calculate approximate resolution from file size
+	// JPEG ~2000x2000 is typically 300-600KB, 640x640 is ~50-100KB
+	sizeKB := len(data) / 1024
+	var resolution string
+	if sizeKB > 200 {
+		resolution = "~2000x2000 (hi-res)"
+	} else if sizeKB > 50 {
+		resolution = "~640x640"
+	} else {
+		resolution = "~300x300"
+	}
+	GoLog("[Cover] Downloaded %d KB (%s)", sizeKB, resolution)
+
 	return data, nil
 }

 // upgradeToMaxQuality upgrades Spotify cover URL to maximum quality
-// Uses same logic as PC version - replaces 640x640 size code with max resolution
+// Same logic as PC version - directly replaces 640x640 size code with max resolution
+// No HEAD verification needed - Spotify CDN always serves max resolution if available
 func upgradeToMaxQuality(coverURL string) string {
 	// Spotify image URLs can be upgraded by changing the size parameter
 	// Format: https://i.scdn.co/image/ab67616d0000b273...
@@ -67,21 +100,7 @@ func upgradeToMaxQuality(coverURL string) string {
 	// ab67616d000082c1 = Max resolution (~2000x2000)

 	if strings.Contains(coverURL, spotifySize640) {
-		// Try max resolution first
-		maxURL := strings.Replace(coverURL, spotifySize640, spotifySizeMax, 1)
-
-		// Verify max resolution URL is available
-		client := NewHTTPClientWithTimeout(DefaultTimeout)
-		req, err := http.NewRequest("HEAD", maxURL, nil)
-		if err == nil {
-			resp, err := DoRequestWithUserAgent(client, req)
-			if err == nil {
-				resp.Body.Close()
-				if resp.StatusCode == http.StatusOK {
-					return maxURL
-				}
-			}
-		}
+		return strings.Replace(coverURL, spotifySize640, spotifySizeMax, 1)
 	}

 	return coverURL
@@ -93,9 +112,12 @@ func GetCoverFromSpotify(imageURL string, maxQuality bool) string {
 		return ""
 	}

+	// Always upgrade small to medium first
+	result := convertSmallToMedium(imageURL)
+
 	if maxQuality {
-		return upgradeToMaxQuality(imageURL)
+		result = upgradeToMaxQuality(result)
 	}

-	return imageURL
+	return result
 }
@@ -19,9 +19,9 @@ const (
 	deezerAlbumURL    = deezerBaseURL + "/album/%s"
 	deezerArtistURL   = deezerBaseURL + "/artist/%s"
 	deezerPlaylistURL = deezerBaseURL + "/playlist/%s"
-	
+
 	deezerCacheTTL = 10 * time.Minute
-	
+
 	// Parallel ISRC fetching settings
 	deezerMaxParallelISRC = 10 // Max concurrent ISRC fetches
 )
@@ -58,27 +58,27 @@ func GetDeezerClient() *DeezerClient {

 // Deezer API response types
 type deezerTrack struct {
-	ID             int64  `json:"id"`
-	Title          string `json:"title"`
-	Duration       int    `json:"duration"` // in seconds
-	TrackPosition  int    `json:"track_position"`
-	DiskNumber     int    `json:"disk_number"`
-	ISRC           string `json:"isrc"`
-	Link           string `json:"link"`
-	ReleaseDate    string `json:"release_date"` // Sometimes at track level
-	Artist         deezerArtist `json:"artist"`
-	Album          deezerAlbumSimple `json:"album"`
-	Contributors   []deezerArtist `json:"contributors"`
+	ID            int64             `json:"id"`
+	Title         string            `json:"title"`
+	Duration      int               `json:"duration"` // in seconds
+	TrackPosition int               `json:"track_position"`
+	DiskNumber    int               `json:"disk_number"`
+	ISRC          string            `json:"isrc"`
+	Link          string            `json:"link"`
+	ReleaseDate   string            `json:"release_date"` // Sometimes at track level
+	Artist        deezerArtist      `json:"artist"`
+	Album         deezerAlbumSimple `json:"album"`
+	Contributors  []deezerArtist    `json:"contributors"`
 }

 type deezerArtist struct {
-	ID        int64  `json:"id"`
-	Name      string `json:"name"`
-	Picture   string `json:"picture"`
+	ID            int64  `json:"id"`
+	Name          string `json:"name"`
+	Picture       string `json:"picture"`
 	PictureMedium string `json:"picture_medium"`
 	PictureBig    string `json:"picture_big"`
 	PictureXL     string `json:"picture_xl"`
-	NbFan     int    `json:"nb_fan"`
+	NbFan         int    `json:"nb_fan"`
 }

 type deezerAlbumSimple struct {
@@ -90,6 +90,7 @@ type deezerAlbumSimple struct {
 	CoverXL     string `json:"cover_xl"`
 	ReleaseDate string `json:"release_date"` // Sometimes at album level
 }
+
 // ... (skip other structs as they are fine/unchanged) ...

 // ... (in convertTrack) ...
@@ -113,7 +114,7 @@ func (c *DeezerClient) convertTrack(track deezerTrack) TrackMetadata {
 	if albumImage == "" {
 		albumImage = track.Album.Cover
 	}
-	
+
 	// Try to find release date
 	releaseDate := track.ReleaseDate
 	if releaseDate == "" {
@@ -137,17 +138,18 @@ func (c *DeezerClient) convertTrack(track deezerTrack) TrackMetadata {
 }

 type deezerAlbumFull struct {
-	ID          int64  `json:"id"`
-	Title       string `json:"title"`
-	Cover       string `json:"cover"`
-	CoverMedium string `json:"cover_medium"`
-	CoverBig    string `json:"cover_big"`
-	CoverXL     string `json:"cover_xl"`
-	ReleaseDate string `json:"release_date"`
-	NbTracks    int    `json:"nb_tracks"`
-	Artist      deezerArtist `json:"artist"`
+	ID           int64          `json:"id"`
+	Title        string         `json:"title"`
+	Cover        string         `json:"cover"`
+	CoverMedium  string         `json:"cover_medium"`
+	CoverBig     string         `json:"cover_big"`
+	CoverXL      string         `json:"cover_xl"`
+	ReleaseDate  string         `json:"release_date"`
+	NbTracks     int            `json:"nb_tracks"`
+	RecordType   string         `json:"record_type"` // album, single, ep, compile
+	Artist       deezerArtist   `json:"artist"`
 	Contributors []deezerArtist `json:"contributors"`
-	Tracks      struct {
+	Tracks       struct {
 		Data []deezerTrack `json:"data"`
 	} `json:"tracks"`
 }
@@ -164,17 +166,17 @@ type deezerArtistFull struct {
 }

 type deezerPlaylistFull struct {
-	ID          int64  `json:"id"`
-	Title       string `json:"title"`
-	Picture     string `json:"picture"`
+	ID            int64  `json:"id"`
+	Title         string `json:"title"`
+	Picture       string `json:"picture"`
 	PictureMedium string `json:"picture_medium"`
 	PictureBig    string `json:"picture_big"`
 	PictureXL     string `json:"picture_xl"`
-	NbTracks    int    `json:"nb_tracks"`
-	Creator     struct {
+	NbTracks      int    `json:"nb_tracks"`
+	Creator       struct {
 		Name string `json:"name"`
 	} `json:"creator"`
-	Tracks      struct {
+	Tracks struct {
 		Data []deezerTrack `json:"data"`
 	} `json:"tracks"`
 }
@@ -182,11 +184,14 @@ type deezerPlaylistFull struct {
 // SearchAll searches for tracks and artists on Deezer
 // NOTE: ISRC is NOT fetched during search for performance - use GetTrackISRC when needed for download
 func (c *DeezerClient) SearchAll(ctx context.Context, query string, trackLimit, artistLimit int) (*SearchAllResult, error) {
+	GoLog("[Deezer] SearchAll: query=%q, trackLimit=%d, artistLimit=%d\n", query, trackLimit, artistLimit)
+
 	cacheKey := fmt.Sprintf("deezer:all:%s:%d:%d", query, trackLimit, artistLimit)
-	
+
 	c.cacheMu.RLock()
 	if entry, ok := c.searchCache[cacheKey]; ok && !entry.isExpired() {
 		c.cacheMu.RUnlock()
+		GoLog("[Deezer] SearchAll: returning cached result\n")
 		return entry.data.(*SearchAllResult), nil
 	}
 	c.cacheMu.RUnlock()
@@ -198,13 +203,28 @@ func (c *DeezerClient) SearchAll(ctx context.Context, query string, trackLimit,

 	// Search tracks - NO ISRC fetch for performance
 	trackURL := fmt.Sprintf("%s/track?q=%s&limit=%d", deezerSearchURL, url.QueryEscape(query), trackLimit)
+	GoLog("[Deezer] Fetching tracks from: %s\n", trackURL)
+
 	var trackResp struct {
-		Data []deezerTrack `json:"data"`
+		Data  []deezerTrack `json:"data"`
+		Error *struct {
+			Type    string `json:"type"`
+			Message string `json:"message"`
+			Code    int    `json:"code"`
+		} `json:"error"`
 	}
 	if err := c.getJSON(ctx, trackURL, &trackResp); err != nil {
+		GoLog("[Deezer] Track search failed: %v\n", err)
 		return nil, fmt.Errorf("deezer track search failed: %w", err)
 	}

+	if trackResp.Error != nil {
+		GoLog("[Deezer] API error: type=%s, code=%d, message=%s\n", trackResp.Error.Type, trackResp.Error.Code, trackResp.Error.Message)
+		return nil, fmt.Errorf("deezer API error: %s (code %d)", trackResp.Error.Message, trackResp.Error.Code)
+	}
+
+	GoLog("[Deezer] Got %d tracks from API\n", len(trackResp.Data))
+
 	for _, track := range trackResp.Data {
 		// Convert directly without fetching ISRC - much faster
 		result.Tracks = append(result.Tracks, c.convertTrack(track))
@@ -212,21 +232,37 @@ func (c *DeezerClient) SearchAll(ctx context.Context, query string, trackLimit,

 	// Search artists
 	artistURL := fmt.Sprintf("%s/artist?q=%s&limit=%d", deezerSearchURL, url.QueryEscape(query), artistLimit)
+	GoLog("[Deezer] Fetching artists from: %s\n", artistURL)
+
 	var artistResp struct {
-		Data []deezerArtist `json:"data"`
+		Data  []deezerArtist `json:"data"`
+		Error *struct {
+			Type    string `json:"type"`
+			Message string `json:"message"`
+			Code    int    `json:"code"`
+		} `json:"error"`
 	}
 	if err := c.getJSON(ctx, artistURL, &artistResp); err == nil {
-		for _, artist := range artistResp.Data {
-			result.Artists = append(result.Artists, SearchArtistResult{
-				ID:         fmt.Sprintf("deezer:%d", artist.ID),
-				Name:       artist.Name,
-				Images:     c.getBestArtistImage(artist),
-				Followers:  artist.NbFan,
-				Popularity: 0,
-			})
+		if artistResp.Error != nil {
+			GoLog("[Deezer] Artist API error: type=%s, code=%d, message=%s\n", artistResp.Error.Type, artistResp.Error.Code, artistResp.Error.Message)
+		} else {
+			GoLog("[Deezer] Got %d artists from API\n", len(artistResp.Data))
+			for _, artist := range artistResp.Data {
+				result.Artists = append(result.Artists, SearchArtistResult{
+					ID:         fmt.Sprintf("deezer:%d", artist.ID),
+					Name:       artist.Name,
+					Images:     c.getBestArtistImage(artist),
+					Followers:  artist.NbFan,
+					Popularity: 0,
+				})
+			}
 		}
+	} else {
+		GoLog("[Deezer] Artist search failed: %v\n", err)
 	}

+	GoLog("[Deezer] SearchAll complete: %d tracks, %d artists\n", len(result.Tracks), len(result.Artists))
+
 	// Cache result
 	c.cacheMu.Lock()
 	c.searchCache[cacheKey] = &cacheEntry{
@@ -241,7 +277,7 @@ func (c *DeezerClient) SearchAll(ctx context.Context, query string, trackLimit,
 // GetTrack fetches a single track by Deezer ID
 func (c *DeezerClient) GetTrack(ctx context.Context, trackID string) (*TrackResponse, error) {
 	trackURL := fmt.Sprintf(deezerTrackURL, trackID)
-	
+
 	var track deezerTrack
 	if err := c.getJSON(ctx, trackURL, &track); err != nil {
 		return nil, err
@@ -263,7 +299,7 @@ func (c *DeezerClient) GetAlbum(ctx context.Context, albumID string) (*AlbumResp
 	c.cacheMu.RUnlock()

 	albumURL := fmt.Sprintf(deezerAlbumURL, albumID)
-	
+
 	var album deezerAlbumFull
 	if err := c.getJSON(ctx, albumURL, &album); err != nil {
 		return nil, err
@@ -291,6 +327,12 @@ func (c *DeezerClient) GetAlbum(ctx context.Context, albumID string) (*AlbumResp
 	isrcMap := c.fetchISRCsParallel(ctx, album.Tracks.Data)

 	tracks := make([]AlbumTrackMetadata, 0, len(album.Tracks.Data))
+	// Normalize record_type (Deezer uses "compile" instead of "compilation")
+	albumType := album.RecordType
+	if albumType == "compile" {
+		albumType = "compilation"
+	}
+
 	for _, track := range album.Tracks.Data {
 		trackIDStr := fmt.Sprintf("%d", track.ID)
 		isrc := isrcMap[trackIDStr]
@@ -310,6 +352,7 @@ func (c *DeezerClient) GetAlbum(ctx context.Context, albumID string) (*AlbumResp
 			ExternalURL: track.Link,
 			ISRC:        isrc,
 			AlbumID:     fmt.Sprintf("deezer:%d", album.ID),
+			AlbumType:   albumType,
 		})
 	}

@@ -375,7 +418,7 @@ func (c *DeezerClient) GetArtist(ctx context.Context, artistID string) (*ArtistR
 			if albumType == "compile" {
 				albumType = "compilation"
 			}
-			
+
 			coverURL := album.CoverXL
 			if coverURL == "" {
 				coverURL = album.CoverBig
@@ -418,7 +461,7 @@ func (c *DeezerClient) GetArtist(ctx context.Context, artistID string) (*ArtistR
 // ISRC is fetched in parallel for better performance
 func (c *DeezerClient) GetPlaylist(ctx context.Context, playlistID string) (*PlaylistResponsePayload, error) {
 	playlistURL := fmt.Sprintf(deezerPlaylistURL, playlistID)
-	
+
 	var playlist deezerPlaylistFull
 	if err := c.getJSON(ctx, playlistURL, &playlist); err != nil {
 		return nil, err
@@ -482,7 +525,7 @@ func (c *DeezerClient) SearchByISRC(ctx context.Context, isrc string) (*TrackMet
 	// Use direct ISRC endpoint (API 2.0)
 	// https://api.deezer.com/2.0/track/isrc:{ISRC}
 	directURL := fmt.Sprintf("%s/track/isrc:%s", deezerBaseURL, isrc)
-	
+
 	var track deezerTrack
 	if err := c.getJSON(ctx, directURL, &track); err != nil {
 		// Fallback to search if direct endpoint fails
@@ -522,7 +565,7 @@ func (c *DeezerClient) fetchFullTrack(ctx context.Context, trackID string) (*dee
 func (c *DeezerClient) fetchISRCsParallel(ctx context.Context, tracks []deezerTrack) map[string]string {
 	result := make(map[string]string)
 	var resultMu sync.Mutex
-	
+
 	// First, check cache for existing ISRCs
 	var tracksToFetch []deezerTrack
 	c.cacheMu.RLock()
@@ -535,20 +578,20 @@ func (c *DeezerClient) fetchISRCsParallel(ctx context.Context, tracks []deezerTr
 		}
 	}
 	c.cacheMu.RUnlock()
-	
+
 	if len(tracksToFetch) == 0 {
 		return result
 	}
-	
+
 	// Use semaphore to limit concurrent requests
 	sem := make(chan struct{}, deezerMaxParallelISRC)
 	var wg sync.WaitGroup
-	
+
 	for _, track := range tracksToFetch {
 		wg.Add(1)
 		go func(t deezerTrack) {
 			defer wg.Done()
-			
+
 			// Acquire semaphore
 			select {
 			case sem <- struct{}{}:
@@ -556,24 +599,24 @@ func (c *DeezerClient) fetchISRCsParallel(ctx context.Context, tracks []deezerTr
 			case <-ctx.Done():
 				return
 			}
-			
+
 			trackIDStr := fmt.Sprintf("%d", t.ID)
 			fullTrack, err := c.fetchFullTrack(ctx, trackIDStr)
 			if err != nil || fullTrack == nil {
 				return
 			}
-			
+
 			// Store in result and cache
 			resultMu.Lock()
 			result[trackIDStr] = fullTrack.ISRC
 			resultMu.Unlock()
-			
+
 			c.cacheMu.Lock()
 			c.isrcCache[trackIDStr] = fullTrack.ISRC
 			c.cacheMu.Unlock()
 		}(track)
 	}
-	
+
 	wg.Wait()
 	return result
 }
@@ -588,23 +631,21 @@ func (c *DeezerClient) GetTrackISRC(ctx context.Context, trackID string) (string
 		return isrc, nil
 	}
 	c.cacheMu.RUnlock()
-	
+
 	// Fetch from API
 	fullTrack, err := c.fetchFullTrack(ctx, trackID)
 	if err != nil {
 		return "", err
 	}
-	
+
 	// Cache the result
 	c.cacheMu.Lock()
 	c.isrcCache[trackID] = fullTrack.ISRC
 	c.cacheMu.Unlock()
-	
+
 	return fullTrack.ISRC, nil
 }

-
-
 func (c *DeezerClient) getBestArtistImage(artist deezerArtist) string {
 	if artist.PictureXL != "" {
 		return artist.PictureXL
@@ -687,7 +728,7 @@ func parseDeezerURL(input string) (string, string, error) {
 	}

 	parts := strings.Split(strings.Trim(parsed.Path, "/"), "/")
-	
+
 	// Skip language prefix if present (e.g., /en/, /fr/)
 	if len(parts) > 0 && len(parts[0]) == 2 {
 		parts = parts[1:]
@@ -0,0 +1,315 @@
+// Package gobackend provides extension manifest parsing and validation
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+)
+
+// ExtensionType represents the type of extension
+type ExtensionType string
+
+const (
+	ExtensionTypeMetadataProvider ExtensionType = "metadata_provider"
+	ExtensionTypeDownloadProvider ExtensionType = "download_provider"
+)
+
+// SettingType represents the type of a setting field
+type SettingType string
+
+const (
+	SettingTypeString SettingType = "string"
+	SettingTypeNumber SettingType = "number"
+	SettingTypeBool   SettingType = "boolean"
+	SettingTypeSelect SettingType = "select"
+)
+
+// ExtensionPermissions defines what resources an extension can access
+type ExtensionPermissions struct {
+	Network []string `json:"network"` // List of allowed domains
+	Storage bool     `json:"storage"` // Whether extension can use storage API
+	File    bool     `json:"file"`    // Whether extension can use file API
+}
+
+// ExtensionSetting defines a configurable setting for an extension
+type ExtensionSetting struct {
+	Key         string      `json:"key"`
+	Type        SettingType `json:"type"`
+	Label       string      `json:"label"`
+	Description string      `json:"description,omitempty"`
+	Required    bool        `json:"required,omitempty"`
+	Secret      bool        `json:"secret,omitempty"`
+	Default     interface{} `json:"default,omitempty"`
+	Options     []string    `json:"options,omitempty"` // For select type
+}
+
+// QualityOption represents a quality option for download providers
+type QualityOption struct {
+	ID          string                   `json:"id"`                 // Unique identifier (e.g., "mp3_320", "opus_128")
+	Label       string                   `json:"label"`              // Display name (e.g., "MP3 320kbps")
+	Description string                   `json:"description"`        // Optional description (e.g., "Best quality MP3")
+	Settings    []QualitySpecificSetting `json:"settings,omitempty"` // Quality-specific settings
+}
+
+// QualitySpecificSetting represents a setting that's specific to a quality option
+type QualitySpecificSetting struct {
+	Key         string      `json:"key"`
+	Type        SettingType `json:"type"`
+	Label       string      `json:"label"`
+	Description string      `json:"description,omitempty"`
+	Required    bool        `json:"required,omitempty"`
+	Secret      bool        `json:"secret,omitempty"`
+	Default     interface{} `json:"default,omitempty"`
+	Options     []string    `json:"options,omitempty"` // For select type
+}
+
+// SearchBehaviorConfig defines custom search behavior for an extension
+type SearchBehaviorConfig struct {
+	Enabled         bool   `json:"enabled"`                   // Whether extension provides custom search
+	Placeholder     string `json:"placeholder,omitempty"`     // Placeholder text for search box
+	Primary         bool   `json:"primary,omitempty"`         // If true, show as primary search tab
+	Icon            string `json:"icon,omitempty"`            // Icon for search tab
+	ThumbnailRatio  string `json:"thumbnailRatio,omitempty"`  // Thumbnail aspect ratio: "square" (1:1), "wide" (16:9), "portrait" (2:3)
+	ThumbnailWidth  int    `json:"thumbnailWidth,omitempty"`  // Custom thumbnail width in pixels
+	ThumbnailHeight int    `json:"thumbnailHeight,omitempty"` // Custom thumbnail height in pixels
+}
+
+// URLHandlerConfig defines custom URL handling for an extension
+type URLHandlerConfig struct {
+	Enabled  bool     `json:"enabled"`            // Whether extension handles URLs
+	Patterns []string `json:"patterns,omitempty"` // URL patterns to match (e.g., "music.youtube.com", "soundcloud.com")
+}
+
+// TrackMatchingConfig defines custom track matching behavior
+type TrackMatchingConfig struct {
+	CustomMatching    bool   `json:"customMatching"`              // Whether extension handles matching
+	Strategy          string `json:"strategy,omitempty"`          // "isrc", "name", "duration", "custom"
+	DurationTolerance int    `json:"durationTolerance,omitempty"` // Tolerance in seconds for duration matching
+}
+
+// PostProcessingHook defines a post-processing hook
+type PostProcessingHook struct {
+	ID               string   `json:"id"`                         // Unique identifier
+	Name             string   `json:"name"`                       // Display name
+	Description      string   `json:"description,omitempty"`      // Description
+	DefaultEnabled   bool     `json:"defaultEnabled,omitempty"`   // Whether enabled by default
+	SupportedFormats []string `json:"supportedFormats,omitempty"` // Supported file formats (e.g., ["flac", "mp3"])
+}
+
+// PostProcessingConfig defines post-processing capabilities
+type PostProcessingConfig struct {
+	Enabled bool                 `json:"enabled"`         // Whether extension provides post-processing
+	Hooks   []PostProcessingHook `json:"hooks,omitempty"` // Available hooks
+}
+
+// ExtensionManifest represents the manifest.json of an extension
+type ExtensionManifest struct {
+	Name                   string                `json:"name"`
+	DisplayName            string                `json:"displayName"`
+	Version                string                `json:"version"`
+	Author                 string                `json:"author"`
+	Description            string                `json:"description"`
+	Homepage               string                `json:"homepage,omitempty"`
+	Icon                   string                `json:"icon,omitempty"` // Icon filename (e.g., "icon.png")
+	Types                  []ExtensionType       `json:"type"`
+	Permissions            ExtensionPermissions  `json:"permissions"`
+	Settings               []ExtensionSetting    `json:"settings,omitempty"`
+	QualityOptions         []QualityOption       `json:"qualityOptions,omitempty"` // Custom quality options for download providers
+	MinAppVersion          string                `json:"minAppVersion,omitempty"`
+	SkipMetadataEnrichment bool                  `json:"skipMetadataEnrichment,omitempty"` // If true, don't enrich metadata from Deezer/Spotify
+	SkipBuiltInFallback    bool                  `json:"skipBuiltInFallback,omitempty"`    // If true, don't fallback to built-in providers (tidal/qobuz/amazon)
+	SearchBehavior         *SearchBehaviorConfig `json:"searchBehavior,omitempty"`         // Custom search behavior
+	URLHandler             *URLHandlerConfig     `json:"urlHandler,omitempty"`             // Custom URL handling
+	TrackMatching          *TrackMatchingConfig  `json:"trackMatching,omitempty"`          // Custom track matching
+	PostProcessing         *PostProcessingConfig `json:"postProcessing,omitempty"`         // Post-processing hooks
+}
+
+// ManifestValidationError represents a validation error in the manifest
+type ManifestValidationError struct {
+	Field   string
+	Message string
+}
+
+func (e *ManifestValidationError) Error() string {
+	return fmt.Sprintf("manifest validation error: %s - %s", e.Field, e.Message)
+}
+
+// ParseManifest parses and validates a manifest from JSON bytes
+func ParseManifest(data []byte) (*ExtensionManifest, error) {
+	var manifest ExtensionManifest
+	if err := json.Unmarshal(data, &manifest); err != nil {
+		return nil, fmt.Errorf("failed to parse manifest JSON: %w", err)
+	}
+
+	if err := manifest.Validate(); err != nil {
+		return nil, err
+	}
+
+	return &manifest, nil
+}
+
+// Validate checks if the manifest has all required fields and valid values
+func (m *ExtensionManifest) Validate() error {
+	// Check required fields
+	if strings.TrimSpace(m.Name) == "" {
+		return &ManifestValidationError{Field: "name", Message: "name is required"}
+	}
+
+	if strings.TrimSpace(m.Version) == "" {
+		return &ManifestValidationError{Field: "version", Message: "version is required"}
+	}
+
+	if strings.TrimSpace(m.Author) == "" {
+		return &ManifestValidationError{Field: "author", Message: "author is required"}
+	}
+
+	if strings.TrimSpace(m.Description) == "" {
+		return &ManifestValidationError{Field: "description", Message: "description is required"}
+	}
+
+	if len(m.Types) == 0 {
+		return &ManifestValidationError{Field: "type", Message: "at least one type is required"}
+	}
+
+	// Validate extension types
+	for _, t := range m.Types {
+		if t != ExtensionTypeMetadataProvider && t != ExtensionTypeDownloadProvider {
+			return &ManifestValidationError{
+				Field:   "type",
+				Message: fmt.Sprintf("invalid extension type: %s (must be 'metadata_provider' or 'download_provider')", t),
+			}
+		}
+	}
+
+	// Validate settings if present
+	for i, setting := range m.Settings {
+		if strings.TrimSpace(setting.Key) == "" {
+			return &ManifestValidationError{
+				Field:   fmt.Sprintf("settings[%d].key", i),
+				Message: "setting key is required",
+			}
+		}
+
+		if setting.Type == "" {
+			return &ManifestValidationError{
+				Field:   fmt.Sprintf("settings[%d].type", i),
+				Message: "setting type is required",
+			}
+		}
+
+		// Validate setting type
+		validTypes := map[SettingType]bool{
+			SettingTypeString: true,
+			SettingTypeNumber: true,
+			SettingTypeBool:   true,
+			SettingTypeSelect: true,
+		}
+		if !validTypes[setting.Type] {
+			return &ManifestValidationError{
+				Field:   fmt.Sprintf("settings[%d].type", i),
+				Message: fmt.Sprintf("invalid setting type: %s", setting.Type),
+			}
+		}
+
+		// Select type requires options
+		if setting.Type == SettingTypeSelect && len(setting.Options) == 0 {
+			return &ManifestValidationError{
+				Field:   fmt.Sprintf("settings[%d].options", i),
+				Message: "select type requires options",
+			}
+		}
+	}
+
+	return nil
+}
+
+// HasType checks if the extension has a specific type
+func (m *ExtensionManifest) HasType(t ExtensionType) bool {
+	for _, et := range m.Types {
+		if et == t {
+			return true
+		}
+	}
+	return false
+}
+
+// IsMetadataProvider returns true if extension provides metadata
+func (m *ExtensionManifest) IsMetadataProvider() bool {
+	return m.HasType(ExtensionTypeMetadataProvider)
+}
+
+// IsDownloadProvider returns true if extension provides downloads
+func (m *ExtensionManifest) IsDownloadProvider() bool {
+	return m.HasType(ExtensionTypeDownloadProvider)
+}
+
+// IsDomainAllowed checks if a domain is in the allowed network permissions
+func (m *ExtensionManifest) IsDomainAllowed(domain string) bool {
+	domain = strings.ToLower(strings.TrimSpace(domain))
+	for _, allowed := range m.Permissions.Network {
+		allowed = strings.ToLower(strings.TrimSpace(allowed))
+		if allowed == domain {
+			return true
+		}
+		// Support wildcard subdomains (e.g., *.example.com)
+		if strings.HasPrefix(allowed, "*.") {
+			suffix := allowed[1:] // Remove the *
+			if strings.HasSuffix(domain, suffix) {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+// HasCustomSearch returns true if extension provides custom search
+func (m *ExtensionManifest) HasCustomSearch() bool {
+	return m.SearchBehavior != nil && m.SearchBehavior.Enabled
+}
+
+// HasCustomMatching returns true if extension provides custom track matching
+func (m *ExtensionManifest) HasCustomMatching() bool {
+	return m.TrackMatching != nil && m.TrackMatching.CustomMatching
+}
+
+// HasPostProcessing returns true if extension provides post-processing
+func (m *ExtensionManifest) HasPostProcessing() bool {
+	return m.PostProcessing != nil && m.PostProcessing.Enabled
+}
+
+// HasURLHandler returns true if extension handles custom URLs
+func (m *ExtensionManifest) HasURLHandler() bool {
+	return m.URLHandler != nil && m.URLHandler.Enabled && len(m.URLHandler.Patterns) > 0
+}
+
+// MatchesURL checks if a URL matches any of the extension's URL patterns
+func (m *ExtensionManifest) MatchesURL(urlStr string) bool {
+	if !m.HasURLHandler() {
+		return false
+	}
+
+	// Parse URL to get host
+	urlStr = strings.ToLower(strings.TrimSpace(urlStr))
+	for _, pattern := range m.URLHandler.Patterns {
+		pattern = strings.ToLower(strings.TrimSpace(pattern))
+		// Check if URL contains the pattern (host match)
+		if strings.Contains(urlStr, pattern) {
+			return true
+		}
+	}
+	return false
+}
+
+// GetPostProcessingHooks returns all post-processing hooks
+func (m *ExtensionManifest) GetPostProcessingHooks() []PostProcessingHook {
+	if m.PostProcessing == nil {
+		return nil
+	}
+	return m.PostProcessing.Hooks
+}
+
+// ToJSON serializes the manifest to JSON
+func (m *ExtensionManifest) ToJSON() ([]byte, error) {
+	return json.Marshal(m)
+}
@@ -0,0 +1,340 @@
+// Package gobackend provides extension runtime with sandboxed execution
+package gobackend
+
+import (
+	"net/http"
+	"net/url"
+	"sync"
+	"time"
+
+	"github.com/dop251/goja"
+)
+
+// Default timeout for JS execution (30 seconds)
+const DefaultJSTimeout = 30 * time.Second
+
+// Global auth state for extensions (stores pending auth codes)
+var (
+	extensionAuthState   = make(map[string]*ExtensionAuthState)
+	extensionAuthStateMu sync.RWMutex
+)
+
+// ExtensionAuthState holds auth state for an extension
+type ExtensionAuthState struct {
+	PendingAuthURL  string
+	AuthCode        string
+	AccessToken     string
+	RefreshToken    string
+	ExpiresAt       time.Time
+	IsAuthenticated bool
+	// PKCE support
+	PKCEVerifier  string
+	PKCEChallenge string
+}
+
+// PendingAuthRequest holds a pending OAuth request that needs Flutter to open URL
+type PendingAuthRequest struct {
+	ExtensionID string
+	AuthURL     string
+	CallbackURL string
+}
+
+// Global pending auth requests (Flutter polls this)
+var (
+	pendingAuthRequests   = make(map[string]*PendingAuthRequest)
+	pendingAuthRequestsMu sync.RWMutex
+)
+
+// GetPendingAuthRequest returns pending auth request for an extension (called from Flutter)
+func GetPendingAuthRequest(extensionID string) *PendingAuthRequest {
+	pendingAuthRequestsMu.RLock()
+	defer pendingAuthRequestsMu.RUnlock()
+	return pendingAuthRequests[extensionID]
+}
+
+// ClearPendingAuthRequest clears pending auth request (called from Flutter after opening URL)
+func ClearPendingAuthRequest(extensionID string) {
+	pendingAuthRequestsMu.Lock()
+	defer pendingAuthRequestsMu.Unlock()
+	delete(pendingAuthRequests, extensionID)
+}
+
+// SetExtensionAuthCode sets auth code for an extension (called from Flutter after OAuth callback)
+func SetExtensionAuthCode(extensionID string, authCode string) {
+	extensionAuthStateMu.Lock()
+	defer extensionAuthStateMu.Unlock()
+
+	state, exists := extensionAuthState[extensionID]
+	if !exists {
+		state = &ExtensionAuthState{}
+		extensionAuthState[extensionID] = state
+	}
+	state.AuthCode = authCode
+}
+
+// SetExtensionTokens sets access/refresh tokens for an extension
+func SetExtensionTokens(extensionID string, accessToken, refreshToken string, expiresAt time.Time) {
+	extensionAuthStateMu.Lock()
+	defer extensionAuthStateMu.Unlock()
+
+	state, exists := extensionAuthState[extensionID]
+	if !exists {
+		state = &ExtensionAuthState{}
+		extensionAuthState[extensionID] = state
+	}
+	state.AccessToken = accessToken
+	state.RefreshToken = refreshToken
+	state.ExpiresAt = expiresAt
+	state.IsAuthenticated = accessToken != ""
+}
+
+// ExtensionRuntime provides sandboxed APIs for extensions
+type ExtensionRuntime struct {
+	extensionID string
+	manifest    *ExtensionManifest
+	settings    map[string]interface{}
+	httpClient  *http.Client
+	cookieJar   http.CookieJar
+	dataDir     string
+	vm          *goja.Runtime
+}
+
+// NewExtensionRuntime creates a new runtime for an extension
+func NewExtensionRuntime(ext *LoadedExtension) *ExtensionRuntime {
+	// Create a cookie jar for this extension
+	jar, _ := newSimpleCookieJar()
+
+	runtime := &ExtensionRuntime{
+		extensionID: ext.ID,
+		manifest:    ext.Manifest,
+		settings:    make(map[string]interface{}),
+		cookieJar:   jar,
+		dataDir:     ext.DataDir,
+		vm:          ext.VM,
+	}
+
+	// Create HTTP client with redirect validation to prevent SSRF via open redirect
+	client := &http.Client{
+		Timeout: 30 * time.Second,
+		Jar:     jar,
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			// Validate redirect target domain against allowed domains
+			domain := req.URL.Hostname()
+			if !ext.Manifest.IsDomainAllowed(domain) {
+				GoLog("[Extension:%s] Redirect blocked: domain '%s' not in allowed list\n", ext.ID, domain)
+				return &RedirectBlockedError{Domain: domain}
+			}
+			// Also block redirects to private/local networks (SSRF protection)
+			if isPrivateIP(domain) {
+				GoLog("[Extension:%s] Redirect blocked: private IP '%s'\n", ext.ID, domain)
+				return &RedirectBlockedError{Domain: domain, IsPrivate: true}
+			}
+			// Default redirect limit (10)
+			if len(via) >= 10 {
+				return http.ErrUseLastResponse
+			}
+			return nil
+		},
+	}
+	runtime.httpClient = client
+
+	return runtime
+}
+
+// RedirectBlockedError is returned when a redirect is blocked due to domain validation
+type RedirectBlockedError struct {
+	Domain    string
+	IsPrivate bool
+}
+
+func (e *RedirectBlockedError) Error() string {
+	if e.IsPrivate {
+		return "redirect blocked: private/local network access denied"
+	}
+	return "redirect blocked: domain '" + e.Domain + "' not in allowed list"
+}
+
+// isPrivateIP checks if a hostname resolves to a private/local IP address
+func isPrivateIP(host string) bool {
+	// Block common private network patterns
+	// This is a simple check - for production, consider DNS resolution
+	privatePatterns := []string{
+		"localhost",
+		"127.",
+		"10.",
+		"172.16.", "172.17.", "172.18.", "172.19.",
+		"172.20.", "172.21.", "172.22.", "172.23.",
+		"172.24.", "172.25.", "172.26.", "172.27.",
+		"172.28.", "172.29.", "172.30.", "172.31.",
+		"192.168.",
+		"169.254.", // Link-local
+		"::1",      // IPv6 localhost
+		"fc00:",    // IPv6 private
+		"fe80:",    // IPv6 link-local
+	}
+
+	hostLower := host
+	for _, pattern := range privatePatterns {
+		if hostLower == pattern || len(hostLower) > len(pattern) && hostLower[:len(pattern)] == pattern {
+			return true
+		}
+	}
+
+	// Also block .local domains
+	if len(host) > 6 && host[len(host)-6:] == ".local" {
+		return true
+	}
+
+	return false
+}
+
+// simpleCookieJar is a simple in-memory cookie jar
+type simpleCookieJar struct {
+	cookies map[string][]*http.Cookie
+	mu      sync.RWMutex
+}
+
+func newSimpleCookieJar() (*simpleCookieJar, error) {
+	return &simpleCookieJar{
+		cookies: make(map[string][]*http.Cookie),
+	}, nil
+}
+
+func (j *simpleCookieJar) SetCookies(u *url.URL, cookies []*http.Cookie) {
+	j.mu.Lock()
+	defer j.mu.Unlock()
+	key := u.Host
+	j.cookies[key] = append(j.cookies[key], cookies...)
+}
+
+func (j *simpleCookieJar) Cookies(u *url.URL) []*http.Cookie {
+	j.mu.RLock()
+	defer j.mu.RUnlock()
+	return j.cookies[u.Host]
+}
+
+// SetSettings updates the runtime settings
+func (r *ExtensionRuntime) SetSettings(settings map[string]interface{}) {
+	r.settings = settings
+}
+
+// RegisterAPIs registers all sandboxed APIs to the Goja VM
+func (r *ExtensionRuntime) RegisterAPIs(vm *goja.Runtime) {
+	r.vm = vm
+
+	// HTTP client (sandboxed to allowed domains)
+	httpObj := vm.NewObject()
+	httpObj.Set("get", r.httpGet)
+	httpObj.Set("post", r.httpPost)
+	httpObj.Set("put", r.httpPut)
+	httpObj.Set("delete", r.httpDelete)
+	httpObj.Set("patch", r.httpPatch)
+	httpObj.Set("request", r.httpRequest) // Generic HTTP request (GET, POST, PUT, DELETE, etc.)
+	httpObj.Set("clearCookies", r.httpClearCookies)
+	vm.Set("http", httpObj)
+
+	// Storage API
+	storageObj := vm.NewObject()
+	storageObj.Set("get", r.storageGet)
+	storageObj.Set("set", r.storageSet)
+	storageObj.Set("remove", r.storageRemove)
+	vm.Set("storage", storageObj)
+
+	// Secure Credentials API (encrypted storage for sensitive data)
+	credentialsObj := vm.NewObject()
+	credentialsObj.Set("store", r.credentialsStore)
+	credentialsObj.Set("get", r.credentialsGet)
+	credentialsObj.Set("remove", r.credentialsRemove)
+	credentialsObj.Set("has", r.credentialsHas)
+	vm.Set("credentials", credentialsObj)
+
+	// Auth API (for OAuth and other auth flows)
+	authObj := vm.NewObject()
+	authObj.Set("openAuthUrl", r.authOpenUrl)
+	authObj.Set("getAuthCode", r.authGetCode)
+	authObj.Set("setAuthCode", r.authSetCode)
+	authObj.Set("clearAuth", r.authClear)
+	authObj.Set("isAuthenticated", r.authIsAuthenticated)
+	authObj.Set("getTokens", r.authGetTokens)
+	// PKCE support
+	authObj.Set("generatePKCE", r.authGeneratePKCE)
+	authObj.Set("getPKCE", r.authGetPKCE)
+	authObj.Set("startOAuthWithPKCE", r.authStartOAuthWithPKCE)
+	authObj.Set("exchangeCodeWithPKCE", r.authExchangeCodeWithPKCE)
+	vm.Set("auth", authObj)
+
+	// File operations (sandboxed)
+	fileObj := vm.NewObject()
+	fileObj.Set("download", r.fileDownload)
+	fileObj.Set("exists", r.fileExists)
+	fileObj.Set("delete", r.fileDelete)
+	fileObj.Set("read", r.fileRead)
+	fileObj.Set("write", r.fileWrite)
+	fileObj.Set("copy", r.fileCopy)
+	fileObj.Set("move", r.fileMove)
+	fileObj.Set("getSize", r.fileGetSize)
+	vm.Set("file", fileObj)
+
+	// FFmpeg API (for post-processing)
+	ffmpegObj := vm.NewObject()
+	ffmpegObj.Set("execute", r.ffmpegExecute)
+	ffmpegObj.Set("getInfo", r.ffmpegGetInfo)
+	ffmpegObj.Set("convert", r.ffmpegConvert)
+	vm.Set("ffmpeg", ffmpegObj)
+
+	// Track matching API
+	matchingObj := vm.NewObject()
+	matchingObj.Set("compareStrings", r.matchingCompareStrings)
+	matchingObj.Set("compareDuration", r.matchingCompareDuration)
+	matchingObj.Set("normalizeString", r.matchingNormalizeString)
+	vm.Set("matching", matchingObj)
+
+	// Utilities
+	utilsObj := vm.NewObject()
+	utilsObj.Set("base64Encode", r.base64Encode)
+	utilsObj.Set("base64Decode", r.base64Decode)
+	utilsObj.Set("md5", r.md5Hash)
+	utilsObj.Set("sha256", r.sha256Hash)
+	utilsObj.Set("hmacSHA256", r.hmacSHA256)
+	utilsObj.Set("hmacSHA256Base64", r.hmacSHA256Base64)
+	utilsObj.Set("hmacSHA1", r.hmacSHA1)
+	utilsObj.Set("parseJSON", r.parseJSON)
+	utilsObj.Set("stringifyJSON", r.stringifyJSON)
+	// Crypto utilities for developers
+	utilsObj.Set("encrypt", r.cryptoEncrypt)
+	utilsObj.Set("decrypt", r.cryptoDecrypt)
+	utilsObj.Set("generateKey", r.cryptoGenerateKey)
+	vm.Set("utils", utilsObj)
+
+	// Log object (already set in extension_manager.go, but we can enhance it)
+	logObj := vm.NewObject()
+	logObj.Set("debug", r.logDebug)
+	logObj.Set("info", r.logInfo)
+	logObj.Set("warn", r.logWarn)
+	logObj.Set("error", r.logError)
+	vm.Set("log", logObj)
+
+	// Go backend functions
+	gobackendObj := vm.NewObject()
+	gobackendObj.Set("sanitizeFilename", r.sanitizeFilenameWrapper)
+	vm.Set("gobackend", gobackendObj)
+
+	// ==================== Browser-like Polyfills ====================
+	// These make porting browser/Node.js libraries easier
+
+	// Global fetch() - Promise-style HTTP API (browser-compatible)
+	vm.Set("fetch", r.fetchPolyfill)
+
+	// Global atob/btoa - Base64 encoding (browser-compatible)
+	vm.Set("atob", r.atobPolyfill)
+	vm.Set("btoa", r.btoaPolyfill)
+
+	// TextEncoder/TextDecoder constructors
+	r.registerTextEncoderDecoder(vm)
+
+	// URL class for URL parsing
+	r.registerURLClass(vm)
+
+	// JSON global (browser-compatible)
+	r.registerJSONGlobal(vm)
+}
@@ -0,0 +1,547 @@
+// Package gobackend provides Auth API and PKCE support for extension runtime
+package gobackend
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/dop251/goja"
+)
+
+// ==================== Auth API (OAuth Support) ====================
+
+// authOpenUrl requests Flutter to open an OAuth URL
+func (r *ExtensionRuntime) authOpenUrl(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "auth URL is required",
+		})
+	}
+
+	authURL := call.Arguments[0].String()
+	callbackURL := ""
+	if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) {
+		callbackURL = call.Arguments[1].String()
+	}
+
+	// Store pending auth request for Flutter to pick up
+	pendingAuthRequestsMu.Lock()
+	pendingAuthRequests[r.extensionID] = &PendingAuthRequest{
+		ExtensionID: r.extensionID,
+		AuthURL:     authURL,
+		CallbackURL: callbackURL,
+	}
+	pendingAuthRequestsMu.Unlock()
+
+	// Update auth state
+	extensionAuthStateMu.Lock()
+	state, exists := extensionAuthState[r.extensionID]
+	if !exists {
+		state = &ExtensionAuthState{}
+		extensionAuthState[r.extensionID] = state
+	}
+	state.PendingAuthURL = authURL
+	state.AuthCode = "" // Clear any previous auth code
+	extensionAuthStateMu.Unlock()
+
+	GoLog("[Extension:%s] Auth URL requested: %s\n", r.extensionID, authURL)
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success": true,
+		"message": "Auth URL will be opened by the app",
+	})
+}
+
+// authGetCode gets the auth code (set by Flutter after OAuth callback)
+func (r *ExtensionRuntime) authGetCode(call goja.FunctionCall) goja.Value {
+	extensionAuthStateMu.RLock()
+	defer extensionAuthStateMu.RUnlock()
+
+	state, exists := extensionAuthState[r.extensionID]
+	if !exists || state.AuthCode == "" {
+		return goja.Undefined()
+	}
+
+	return r.vm.ToValue(state.AuthCode)
+}
+
+// authSetCode sets auth code and tokens (can be called by extension after token exchange)
+func (r *ExtensionRuntime) authSetCode(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(false)
+	}
+
+	// Can accept either just auth code or an object with tokens
+	arg := call.Arguments[0].Export()
+
+	extensionAuthStateMu.Lock()
+	defer extensionAuthStateMu.Unlock()
+
+	state, exists := extensionAuthState[r.extensionID]
+	if !exists {
+		state = &ExtensionAuthState{}
+		extensionAuthState[r.extensionID] = state
+	}
+
+	switch v := arg.(type) {
+	case string:
+		state.AuthCode = v
+	case map[string]interface{}:
+		if code, ok := v["code"].(string); ok {
+			state.AuthCode = code
+		}
+		if accessToken, ok := v["access_token"].(string); ok {
+			state.AccessToken = accessToken
+			state.IsAuthenticated = true
+		}
+		if refreshToken, ok := v["refresh_token"].(string); ok {
+			state.RefreshToken = refreshToken
+		}
+		if expiresIn, ok := v["expires_in"].(float64); ok {
+			state.ExpiresAt = time.Now().Add(time.Duration(expiresIn) * time.Second)
+		}
+	}
+
+	return r.vm.ToValue(true)
+}
+
+// authClear clears all auth state for the extension
+func (r *ExtensionRuntime) authClear(call goja.FunctionCall) goja.Value {
+	extensionAuthStateMu.Lock()
+	delete(extensionAuthState, r.extensionID)
+	extensionAuthStateMu.Unlock()
+
+	pendingAuthRequestsMu.Lock()
+	delete(pendingAuthRequests, r.extensionID)
+	pendingAuthRequestsMu.Unlock()
+
+	GoLog("[Extension:%s] Auth state cleared\n", r.extensionID)
+	return r.vm.ToValue(true)
+}
+
+// authIsAuthenticated checks if extension has valid auth
+func (r *ExtensionRuntime) authIsAuthenticated(call goja.FunctionCall) goja.Value {
+	extensionAuthStateMu.RLock()
+	defer extensionAuthStateMu.RUnlock()
+
+	state, exists := extensionAuthState[r.extensionID]
+	if !exists {
+		return r.vm.ToValue(false)
+	}
+
+	// Check if token is expired
+	if state.IsAuthenticated && !state.ExpiresAt.IsZero() && time.Now().After(state.ExpiresAt) {
+		return r.vm.ToValue(false)
+	}
+
+	return r.vm.ToValue(state.IsAuthenticated)
+}
+
+// authGetTokens returns current tokens (for extension to use in API calls)
+func (r *ExtensionRuntime) authGetTokens(call goja.FunctionCall) goja.Value {
+	extensionAuthStateMu.RLock()
+	defer extensionAuthStateMu.RUnlock()
+
+	state, exists := extensionAuthState[r.extensionID]
+	if !exists {
+		return r.vm.ToValue(map[string]interface{}{})
+	}
+
+	result := map[string]interface{}{
+		"access_token":     state.AccessToken,
+		"refresh_token":    state.RefreshToken,
+		"is_authenticated": state.IsAuthenticated,
+	}
+
+	if !state.ExpiresAt.IsZero() {
+		result["expires_at"] = state.ExpiresAt.Unix()
+		result["is_expired"] = time.Now().After(state.ExpiresAt)
+	}
+
+	return r.vm.ToValue(result)
+}
+
+// ==================== PKCE Support ====================
+
+// generatePKCEVerifier generates a cryptographically random code verifier
+// Length should be between 43-128 characters (RFC 7636)
+func generatePKCEVerifier(length int) (string, error) {
+	if length < 43 {
+		length = 43
+	}
+	if length > 128 {
+		length = 128
+	}
+
+	// Generate random bytes
+	bytes := make([]byte, length)
+	if _, err := rand.Read(bytes); err != nil {
+		return "", err
+	}
+
+	// Use base64url encoding without padding (RFC 7636 compliant)
+	verifier := base64.RawURLEncoding.EncodeToString(bytes)
+
+	// Trim to exact length
+	if len(verifier) > length {
+		verifier = verifier[:length]
+	}
+
+	return verifier, nil
+}
+
+// generatePKCEChallenge generates a code challenge from verifier using S256 method
+func generatePKCEChallenge(verifier string) string {
+	hash := sha256.Sum256([]byte(verifier))
+	// Base64url encode without padding (RFC 7636)
+	return base64.RawURLEncoding.EncodeToString(hash[:])
+}
+
+// authGeneratePKCE generates a PKCE code verifier and challenge pair
+// Returns: { verifier: string, challenge: string, method: "S256" }
+func (r *ExtensionRuntime) authGeneratePKCE(call goja.FunctionCall) goja.Value {
+	// Default length is 64 characters
+	length := 64
+	if len(call.Arguments) > 0 && !goja.IsUndefined(call.Arguments[0]) {
+		if l, ok := call.Arguments[0].Export().(float64); ok && l >= 43 && l <= 128 {
+			length = int(l)
+		}
+	}
+
+	verifier, err := generatePKCEVerifier(length)
+	if err != nil {
+		GoLog("[Extension:%s] PKCE generation error: %v\n", r.extensionID, err)
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	challenge := generatePKCEChallenge(verifier)
+
+	// Store in auth state for later use
+	extensionAuthStateMu.Lock()
+	state, exists := extensionAuthState[r.extensionID]
+	if !exists {
+		state = &ExtensionAuthState{}
+		extensionAuthState[r.extensionID] = state
+	}
+	state.PKCEVerifier = verifier
+	state.PKCEChallenge = challenge
+	extensionAuthStateMu.Unlock()
+
+	GoLog("[Extension:%s] PKCE generated (verifier length: %d)\n", r.extensionID, len(verifier))
+
+	return r.vm.ToValue(map[string]interface{}{
+		"verifier":  verifier,
+		"challenge": challenge,
+		"method":    "S256",
+	})
+}
+
+// authGetPKCE returns the current PKCE verifier and challenge (if generated)
+func (r *ExtensionRuntime) authGetPKCE(call goja.FunctionCall) goja.Value {
+	extensionAuthStateMu.RLock()
+	defer extensionAuthStateMu.RUnlock()
+
+	state, exists := extensionAuthState[r.extensionID]
+	if !exists || state.PKCEVerifier == "" {
+		return r.vm.ToValue(map[string]interface{}{})
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"verifier":  state.PKCEVerifier,
+		"challenge": state.PKCEChallenge,
+		"method":    "S256",
+	})
+}
+
+// authStartOAuthWithPKCE is a high-level helper that generates PKCE and opens OAuth URL
+// config: { authUrl, clientId, redirectUri, scope, extraParams }
+// Returns: { success, authUrl, pkce: { verifier, challenge } }
+func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "config object is required",
+		})
+	}
+
+	configObj := call.Arguments[0].Export()
+	config, ok := configObj.(map[string]interface{})
+	if !ok {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "config must be an object",
+		})
+	}
+
+	// Required fields
+	authURL, _ := config["authUrl"].(string)
+	clientID, _ := config["clientId"].(string)
+	redirectURI, _ := config["redirectUri"].(string)
+
+	if authURL == "" || clientID == "" || redirectURI == "" {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "authUrl, clientId, and redirectUri are required",
+		})
+	}
+
+	// Optional fields
+	scope, _ := config["scope"].(string)
+	extraParams, _ := config["extraParams"].(map[string]interface{})
+
+	// Generate PKCE
+	verifier, err := generatePKCEVerifier(64)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   fmt.Sprintf("failed to generate PKCE: %v", err),
+		})
+	}
+	challenge := generatePKCEChallenge(verifier)
+
+	// Store PKCE in auth state
+	extensionAuthStateMu.Lock()
+	state, exists := extensionAuthState[r.extensionID]
+	if !exists {
+		state = &ExtensionAuthState{}
+		extensionAuthState[r.extensionID] = state
+	}
+	state.PKCEVerifier = verifier
+	state.PKCEChallenge = challenge
+	state.AuthCode = "" // Clear any previous auth code
+	extensionAuthStateMu.Unlock()
+
+	// Build OAuth URL with PKCE parameters
+	parsedURL, err := url.Parse(authURL)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   fmt.Sprintf("invalid authUrl: %v", err),
+		})
+	}
+
+	query := parsedURL.Query()
+	query.Set("client_id", clientID)
+	query.Set("redirect_uri", redirectURI)
+	query.Set("response_type", "code")
+	query.Set("code_challenge", challenge)
+	query.Set("code_challenge_method", "S256")
+
+	if scope != "" {
+		query.Set("scope", scope)
+	}
+
+	// Add extra params
+	for k, v := range extraParams {
+		query.Set(k, fmt.Sprintf("%v", v))
+	}
+
+	parsedURL.RawQuery = query.Encode()
+	fullAuthURL := parsedURL.String()
+
+	// Store pending auth request for Flutter
+	pendingAuthRequestsMu.Lock()
+	pendingAuthRequests[r.extensionID] = &PendingAuthRequest{
+		ExtensionID: r.extensionID,
+		AuthURL:     fullAuthURL,
+		CallbackURL: redirectURI,
+	}
+	pendingAuthRequestsMu.Unlock()
+
+	GoLog("[Extension:%s] PKCE OAuth started: %s\n", r.extensionID, fullAuthURL)
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success": true,
+		"authUrl": fullAuthURL,
+		"pkce": map[string]interface{}{
+			"verifier":  verifier,
+			"challenge": challenge,
+			"method":    "S256",
+		},
+	})
+}
+
+// authExchangeCodeWithPKCE exchanges auth code for tokens using PKCE
+// config: { tokenUrl, clientId, redirectUri, code, extraParams }
+// Uses the stored PKCE verifier automatically
+func (r *ExtensionRuntime) authExchangeCodeWithPKCE(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "config object is required",
+		})
+	}
+
+	configObj := call.Arguments[0].Export()
+	config, ok := configObj.(map[string]interface{})
+	if !ok {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "config must be an object",
+		})
+	}
+
+	// Required fields
+	tokenURL, _ := config["tokenUrl"].(string)
+	clientID, _ := config["clientId"].(string)
+	redirectURI, _ := config["redirectUri"].(string)
+	code, _ := config["code"].(string)
+
+	if tokenURL == "" || clientID == "" || code == "" {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "tokenUrl, clientId, and code are required",
+		})
+	}
+
+	// Get stored PKCE verifier
+	extensionAuthStateMu.RLock()
+	state, exists := extensionAuthState[r.extensionID]
+	var verifier string
+	if exists {
+		verifier = state.PKCEVerifier
+	}
+	extensionAuthStateMu.RUnlock()
+
+	if verifier == "" {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "no PKCE verifier found - call generatePKCE or startOAuthWithPKCE first",
+		})
+	}
+
+	// Validate domain
+	if err := r.validateDomain(tokenURL); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	// Build token request body
+	formData := url.Values{}
+	formData.Set("grant_type", "authorization_code")
+	formData.Set("client_id", clientID)
+	formData.Set("code", code)
+	formData.Set("code_verifier", verifier)
+	if redirectURI != "" {
+		formData.Set("redirect_uri", redirectURI)
+	}
+
+	// Add extra params
+	if extraParams, ok := config["extraParams"].(map[string]interface{}); ok {
+		for k, v := range extraParams {
+			formData.Set(k, fmt.Sprintf("%v", v))
+		}
+	}
+
+	// Make token request
+	req, err := http.NewRequest("POST", tokenURL, strings.NewReader(formData.Encode()))
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	req.Header.Set("User-Agent", "SpotiFLAC-Extension/1.0")
+
+	resp, err := r.httpClient.Do(req)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	// Parse response
+	var tokenResp map[string]interface{}
+	if err := json.Unmarshal(body, &tokenResp); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   fmt.Sprintf("failed to parse token response: %v", err),
+			"body":    string(body),
+		})
+	}
+
+	// Check for error in response
+	if errMsg, ok := tokenResp["error"].(string); ok {
+		errDesc, _ := tokenResp["error_description"].(string)
+		return r.vm.ToValue(map[string]interface{}{
+			"success":           false,
+			"error":             errMsg,
+			"error_description": errDesc,
+		})
+	}
+
+	// Extract tokens
+	accessToken, _ := tokenResp["access_token"].(string)
+	refreshToken, _ := tokenResp["refresh_token"].(string)
+	expiresIn, _ := tokenResp["expires_in"].(float64)
+
+	if accessToken == "" {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "no access_token in response",
+			"body":    string(body),
+		})
+	}
+
+	// Store tokens in auth state
+	extensionAuthStateMu.Lock()
+	state, exists = extensionAuthState[r.extensionID]
+	if !exists {
+		state = &ExtensionAuthState{}
+		extensionAuthState[r.extensionID] = state
+	}
+	state.AccessToken = accessToken
+	state.RefreshToken = refreshToken
+	state.IsAuthenticated = true
+	if expiresIn > 0 {
+		state.ExpiresAt = time.Now().Add(time.Duration(expiresIn) * time.Second)
+	}
+	// Clear PKCE after successful exchange
+	state.PKCEVerifier = ""
+	state.PKCEChallenge = ""
+	extensionAuthStateMu.Unlock()
+
+	GoLog("[Extension:%s] PKCE token exchange successful\n", r.extensionID)
+
+	// Return full token response
+	result := map[string]interface{}{
+		"success":       true,
+		"access_token":  accessToken,
+		"refresh_token": refreshToken,
+		"token_type":    tokenResp["token_type"],
+	}
+	if expiresIn > 0 {
+		result["expires_in"] = expiresIn
+	}
+	// Include any additional fields from response
+	if scope, ok := tokenResp["scope"].(string); ok {
+		result["scope"] = scope
+	}
+
+	return r.vm.ToValue(result)
+}
@@ -0,0 +1,204 @@
+// Package gobackend provides FFmpeg API for extension runtime
+package gobackend
+
+import (
+	"fmt"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/dop251/goja"
+)
+
+// ==================== FFmpeg API (Post-Processing) ====================
+
+// FFmpegCommand holds a pending FFmpeg command for Flutter to execute
+type FFmpegCommand struct {
+	ExtensionID string
+	Command     string
+	InputPath   string
+	OutputPath  string
+	Completed   bool
+	Success     bool
+	Error       string
+	Output      string
+}
+
+// Global FFmpeg command queue
+var (
+	ffmpegCommands   = make(map[string]*FFmpegCommand)
+	ffmpegCommandsMu sync.RWMutex
+	ffmpegCommandID  int64
+)
+
+// GetPendingFFmpegCommand returns a pending FFmpeg command (called from Flutter)
+func GetPendingFFmpegCommand(commandID string) *FFmpegCommand {
+	ffmpegCommandsMu.RLock()
+	defer ffmpegCommandsMu.RUnlock()
+	return ffmpegCommands[commandID]
+}
+
+// SetFFmpegCommandResult sets the result of an FFmpeg command (called from Flutter)
+func SetFFmpegCommandResult(commandID string, success bool, output, errorMsg string) {
+	ffmpegCommandsMu.Lock()
+	defer ffmpegCommandsMu.Unlock()
+	if cmd, exists := ffmpegCommands[commandID]; exists {
+		cmd.Completed = true
+		cmd.Success = success
+		cmd.Output = output
+		cmd.Error = errorMsg
+	}
+}
+
+// ClearFFmpegCommand removes a completed FFmpeg command
+func ClearFFmpegCommand(commandID string) {
+	ffmpegCommandsMu.Lock()
+	defer ffmpegCommandsMu.Unlock()
+	delete(ffmpegCommands, commandID)
+}
+
+// ffmpegExecute queues an FFmpeg command for execution by Flutter
+func (r *ExtensionRuntime) ffmpegExecute(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "command is required",
+		})
+	}
+
+	command := call.Arguments[0].String()
+
+	// Generate unique command ID
+	ffmpegCommandsMu.Lock()
+	ffmpegCommandID++
+	cmdID := fmt.Sprintf("%s_%d", r.extensionID, ffmpegCommandID)
+	ffmpegCommands[cmdID] = &FFmpegCommand{
+		ExtensionID: r.extensionID,
+		Command:     command,
+		Completed:   false,
+	}
+	ffmpegCommandsMu.Unlock()
+
+	GoLog("[Extension:%s] FFmpeg command queued: %s\n", r.extensionID, cmdID)
+
+	// Wait for completion (with timeout)
+	timeout := 5 * time.Minute
+	start := time.Now()
+	for {
+		ffmpegCommandsMu.RLock()
+		cmd := ffmpegCommands[cmdID]
+		completed := cmd != nil && cmd.Completed
+		ffmpegCommandsMu.RUnlock()
+
+		if completed {
+			ffmpegCommandsMu.RLock()
+			result := map[string]interface{}{
+				"success": cmd.Success,
+				"output":  cmd.Output,
+			}
+			if cmd.Error != "" {
+				result["error"] = cmd.Error
+			}
+			ffmpegCommandsMu.RUnlock()
+
+			// Cleanup
+			ClearFFmpegCommand(cmdID)
+			return r.vm.ToValue(result)
+		}
+
+		if time.Since(start) > timeout {
+			ClearFFmpegCommand(cmdID)
+			return r.vm.ToValue(map[string]interface{}{
+				"success": false,
+				"error":   "FFmpeg command timed out",
+			})
+		}
+
+		time.Sleep(100 * time.Millisecond)
+	}
+}
+
+// ffmpegGetInfo gets audio file information using FFprobe
+func (r *ExtensionRuntime) ffmpegGetInfo(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "file path is required",
+		})
+	}
+
+	filePath := call.Arguments[0].String()
+
+	// Use Go's built-in audio quality function
+	quality, err := GetAudioQuality(filePath)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success":       true,
+		"bit_depth":     quality.BitDepth,
+		"sample_rate":   quality.SampleRate,
+		"total_samples": quality.TotalSamples,
+		"duration":      float64(quality.TotalSamples) / float64(quality.SampleRate),
+	})
+}
+
+// ffmpegConvert is a helper for common conversion operations
+func (r *ExtensionRuntime) ffmpegConvert(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "input and output paths are required",
+		})
+	}
+
+	inputPath := call.Arguments[0].String()
+	outputPath := call.Arguments[1].String()
+
+	// Get options if provided
+	options := map[string]interface{}{}
+	if len(call.Arguments) > 2 && !goja.IsUndefined(call.Arguments[2]) && !goja.IsNull(call.Arguments[2]) {
+		if opts, ok := call.Arguments[2].Export().(map[string]interface{}); ok {
+			options = opts
+		}
+	}
+
+	// Build FFmpeg command
+	var cmdParts []string
+	cmdParts = append(cmdParts, "-i", fmt.Sprintf("%q", inputPath))
+
+	// Audio codec
+	if codec, ok := options["codec"].(string); ok {
+		cmdParts = append(cmdParts, "-c:a", codec)
+	}
+
+	// Bitrate
+	if bitrate, ok := options["bitrate"].(string); ok {
+		cmdParts = append(cmdParts, "-b:a", bitrate)
+	}
+
+	// Sample rate
+	if sampleRate, ok := options["sample_rate"].(float64); ok {
+		cmdParts = append(cmdParts, "-ar", fmt.Sprintf("%d", int(sampleRate)))
+	}
+
+	// Channels
+	if channels, ok := options["channels"].(float64); ok {
+		cmdParts = append(cmdParts, "-ac", fmt.Sprintf("%d", int(channels)))
+	}
+
+	// Overwrite output
+	cmdParts = append(cmdParts, "-y", fmt.Sprintf("%q", outputPath))
+
+	command := strings.Join(cmdParts, " ")
+
+	// Execute via ffmpegExecute
+	execCall := goja.FunctionCall{
+		Arguments: []goja.Value{r.vm.ToValue(command)},
+	}
+	return r.ffmpegExecute(execCall)
+}
@@ -0,0 +1,523 @@
+// Package gobackend provides File API for extension runtime
+package gobackend
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+
+	"github.com/dop251/goja"
+)
+
+// ==================== File API (Sandboxed) ====================
+
+// List of allowed directories for file operations (set by Go backend for download operations)
+var (
+	allowedDownloadDirs   []string
+	allowedDownloadDirsMu sync.RWMutex
+)
+
+// SetAllowedDownloadDirs sets the list of directories where extensions can write files
+// This should be called by the Go backend when setting up download paths
+func SetAllowedDownloadDirs(dirs []string) {
+	allowedDownloadDirsMu.Lock()
+	defer allowedDownloadDirsMu.Unlock()
+	allowedDownloadDirs = dirs
+	GoLog("[Extension] Allowed download directories set: %v\n", dirs)
+}
+
+// AddAllowedDownloadDir adds a directory to the allowed list
+func AddAllowedDownloadDir(dir string) {
+	allowedDownloadDirsMu.Lock()
+	defer allowedDownloadDirsMu.Unlock()
+	absDir, err := filepath.Abs(dir)
+	if err == nil {
+		allowedDownloadDirs = append(allowedDownloadDirs, absDir)
+	}
+}
+
+// isPathInAllowedDirs checks if an absolute path is within any allowed directory
+func isPathInAllowedDirs(absPath string) bool {
+	allowedDownloadDirsMu.RLock()
+	defer allowedDownloadDirsMu.RUnlock()
+
+	for _, allowedDir := range allowedDownloadDirs {
+		if strings.HasPrefix(absPath, allowedDir) {
+			return true
+		}
+	}
+	return false
+}
+
+// validatePath checks if the path is within the extension's sandbox
+// Security: Absolute paths are BLOCKED unless they're in allowed download directories
+// Extensions should use relative paths for their own data storage
+func (r *ExtensionRuntime) validatePath(path string) (string, error) {
+	// Check if extension has file permission
+	if !r.manifest.Permissions.File {
+		return "", fmt.Errorf("file access denied: extension does not have 'file' permission")
+	}
+
+	// Clean and resolve the path
+	cleanPath := filepath.Clean(path)
+
+	// SECURITY: Block absolute paths by default
+	// Only allow if path is in explicitly allowed download directories
+	if filepath.IsAbs(cleanPath) {
+		absPath, err := filepath.Abs(cleanPath)
+		if err != nil {
+			return "", fmt.Errorf("invalid path: %w", err)
+		}
+
+		// Check if path is in allowed download directories
+		if isPathInAllowedDirs(absPath) {
+			return absPath, nil
+		}
+
+		// Block all other absolute paths
+		return "", fmt.Errorf("file access denied: absolute paths are not allowed. Use relative paths within extension sandbox")
+	}
+
+	// For relative paths, join with data directory (extension's sandbox)
+	fullPath := filepath.Join(r.dataDir, cleanPath)
+
+	// Resolve to absolute path
+	absPath, err := filepath.Abs(fullPath)
+	if err != nil {
+		return "", fmt.Errorf("invalid path: %w", err)
+	}
+
+	// Ensure path is within data directory (prevent path traversal)
+	absDataDir, _ := filepath.Abs(r.dataDir)
+	if !strings.HasPrefix(absPath, absDataDir) {
+		return "", fmt.Errorf("file access denied: path '%s' is outside sandbox", path)
+	}
+
+	return absPath, nil
+}
+
+// fileDownload downloads a file from URL to the specified path
+// Supports progress callback via options.onProgress
+func (r *ExtensionRuntime) fileDownload(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "URL and output path are required",
+		})
+	}
+
+	urlStr := call.Arguments[0].String()
+	outputPath := call.Arguments[1].String()
+
+	// Validate domain
+	if err := r.validateDomain(urlStr); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	// Validate output path (allows absolute paths for download queue)
+	fullPath, err := r.validatePath(outputPath)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	// Get options if provided
+	var onProgress goja.Callable
+	var headers map[string]string
+	if len(call.Arguments) > 2 && !goja.IsUndefined(call.Arguments[2]) && !goja.IsNull(call.Arguments[2]) {
+		optionsObj := call.Arguments[2].Export()
+		if opts, ok := optionsObj.(map[string]interface{}); ok {
+			// Extract headers
+			if h, ok := opts["headers"].(map[string]interface{}); ok {
+				headers = make(map[string]string)
+				for k, v := range h {
+					headers[k] = fmt.Sprintf("%v", v)
+				}
+			}
+			// Extract onProgress callback
+			if progressVal, ok := opts["onProgress"]; ok {
+				if callable, ok := goja.AssertFunction(r.vm.ToValue(progressVal)); ok {
+					onProgress = callable
+				}
+			}
+		}
+	}
+
+	// Create directory if needed
+	dir := filepath.Dir(fullPath)
+	if err := os.MkdirAll(dir, 0755); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   fmt.Sprintf("failed to create directory: %v", err),
+		})
+	}
+
+	// Create HTTP request
+	req, err := http.NewRequest("GET", urlStr, nil)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	// Set headers
+	for k, v := range headers {
+		req.Header.Set(k, v)
+	}
+	if req.Header.Get("User-Agent") == "" {
+		req.Header.Set("User-Agent", "SpotiFLAC-Extension/1.0")
+	}
+
+	// Download file
+	resp, err := r.httpClient.Do(req)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   fmt.Sprintf("HTTP error: %d", resp.StatusCode),
+		})
+	}
+
+	// Create output file
+	out, err := os.Create(fullPath)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   fmt.Sprintf("failed to create file: %v", err),
+		})
+	}
+	defer out.Close()
+
+	// Get content length for progress
+	contentLength := resp.ContentLength
+
+	// Copy content with progress reporting
+	var written int64
+	buf := make([]byte, 32*1024) // 32KB buffer
+	for {
+		nr, er := resp.Body.Read(buf)
+		if nr > 0 {
+			nw, ew := out.Write(buf[0:nr])
+			if nw < 0 || nr < nw {
+				nw = 0
+				if ew == nil {
+					ew = fmt.Errorf("invalid write result")
+				}
+			}
+			written += int64(nw)
+			if ew != nil {
+				return r.vm.ToValue(map[string]interface{}{
+					"success": false,
+					"error":   fmt.Sprintf("failed to write file: %v", ew),
+				})
+			}
+			if nr != nw {
+				return r.vm.ToValue(map[string]interface{}{
+					"success": false,
+					"error":   "short write",
+				})
+			}
+
+			// Report progress
+			if onProgress != nil && contentLength > 0 {
+				_, _ = onProgress(goja.Undefined(), r.vm.ToValue(written), r.vm.ToValue(contentLength))
+			}
+		}
+		if er != nil {
+			if er != io.EOF {
+				return r.vm.ToValue(map[string]interface{}{
+					"success": false,
+					"error":   fmt.Sprintf("failed to read response: %v", er),
+				})
+			}
+			break
+		}
+	}
+
+	GoLog("[Extension:%s] Downloaded %d bytes to %s\n", r.extensionID, written, fullPath)
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success": true,
+		"path":    fullPath,
+		"size":    written,
+	})
+}
+
+// fileExists checks if a file exists in the sandbox
+func (r *ExtensionRuntime) fileExists(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(false)
+	}
+
+	path := call.Arguments[0].String()
+	fullPath, err := r.validatePath(path)
+	if err != nil {
+		return r.vm.ToValue(false)
+	}
+
+	_, err = os.Stat(fullPath)
+	return r.vm.ToValue(err == nil)
+}
+
+// fileDelete deletes a file in the sandbox
+func (r *ExtensionRuntime) fileDelete(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "path is required",
+		})
+	}
+
+	path := call.Arguments[0].String()
+	fullPath, err := r.validatePath(path)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	if err := os.Remove(fullPath); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success": true,
+	})
+}
+
+// fileRead reads a file from the sandbox
+func (r *ExtensionRuntime) fileRead(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "path is required",
+		})
+	}
+
+	path := call.Arguments[0].String()
+	fullPath, err := r.validatePath(path)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	data, err := os.ReadFile(fullPath)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success": true,
+		"data":    string(data),
+	})
+}
+
+// fileWrite writes data to a file in the sandbox
+func (r *ExtensionRuntime) fileWrite(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "path and data are required",
+		})
+	}
+
+	path := call.Arguments[0].String()
+	data := call.Arguments[1].String()
+
+	fullPath, err := r.validatePath(path)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	// Create directory if needed
+	dir := filepath.Dir(fullPath)
+	if err := os.MkdirAll(dir, 0755); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   fmt.Sprintf("failed to create directory: %v", err),
+		})
+	}
+
+	if err := os.WriteFile(fullPath, []byte(data), 0644); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success": true,
+		"path":    fullPath,
+	})
+}
+
+// fileCopy copies a file within the sandbox
+func (r *ExtensionRuntime) fileCopy(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "source and destination paths are required",
+		})
+	}
+
+	srcPath := call.Arguments[0].String()
+	dstPath := call.Arguments[1].String()
+
+	fullSrc, err := r.validatePath(srcPath)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	fullDst, err := r.validatePath(dstPath)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	// Read source file
+	data, err := os.ReadFile(fullSrc)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   fmt.Sprintf("failed to read source: %v", err),
+		})
+	}
+
+	// Create destination directory if needed
+	dir := filepath.Dir(fullDst)
+	if err := os.MkdirAll(dir, 0755); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   fmt.Sprintf("failed to create directory: %v", err),
+		})
+	}
+
+	// Write to destination
+	if err := os.WriteFile(fullDst, data, 0644); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   fmt.Sprintf("failed to write destination: %v", err),
+		})
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success": true,
+		"path":    fullDst,
+	})
+}
+
+// fileMove moves/renames a file within the sandbox
+func (r *ExtensionRuntime) fileMove(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "source and destination paths are required",
+		})
+	}
+
+	srcPath := call.Arguments[0].String()
+	dstPath := call.Arguments[1].String()
+
+	fullSrc, err := r.validatePath(srcPath)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	fullDst, err := r.validatePath(dstPath)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	// Create destination directory if needed
+	dir := filepath.Dir(fullDst)
+	if err := os.MkdirAll(dir, 0755); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   fmt.Sprintf("failed to create directory: %v", err),
+		})
+	}
+
+	if err := os.Rename(fullSrc, fullDst); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   fmt.Sprintf("failed to move file: %v", err),
+		})
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success": true,
+		"path":    fullDst,
+	})
+}
+
+// fileGetSize returns the size of a file in bytes
+func (r *ExtensionRuntime) fileGetSize(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "path is required",
+		})
+	}
+
+	path := call.Arguments[0].String()
+	fullPath, err := r.validatePath(path)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	info, err := os.Stat(fullPath)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success": true,
+		"size":    info.Size(),
+	})
+}
@@ -0,0 +1,505 @@
+// Package gobackend provides HTTP API for extension runtime
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/dop251/goja"
+)
+
+// ==================== HTTP API (Sandboxed) ====================
+
+// HTTPResponse represents the response from an HTTP request
+type HTTPResponse struct {
+	StatusCode int               `json:"statusCode"`
+	Body       string            `json:"body"`
+	Headers    map[string]string `json:"headers"`
+}
+
+// validateDomain checks if the domain is allowed by the extension's permissions
+func (r *ExtensionRuntime) validateDomain(urlStr string) error {
+	parsed, err := url.Parse(urlStr)
+	if err != nil {
+		return fmt.Errorf("invalid URL: %w", err)
+	}
+
+	domain := parsed.Hostname()
+
+	// Block private/local network access (SSRF protection)
+	if isPrivateIP(domain) {
+		return fmt.Errorf("network access denied: private/local network '%s' not allowed", domain)
+	}
+
+	if !r.manifest.IsDomainAllowed(domain) {
+		return fmt.Errorf("network access denied: domain '%s' not in allowed list", domain)
+	}
+
+	return nil
+}
+
+// httpGet performs a GET request (sandboxed)
+func (r *ExtensionRuntime) httpGet(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": "URL is required",
+		})
+	}
+
+	urlStr := call.Arguments[0].String()
+
+	// Validate domain
+	if err := r.validateDomain(urlStr); err != nil {
+		GoLog("[Extension:%s] HTTP blocked: %v\n", r.extensionID, err)
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	// Get headers if provided
+	headers := make(map[string]string)
+	if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) && !goja.IsNull(call.Arguments[1]) {
+		headersObj := call.Arguments[1].Export()
+		if h, ok := headersObj.(map[string]interface{}); ok {
+			for k, v := range h {
+				headers[k] = fmt.Sprintf("%v", v)
+			}
+		}
+	}
+
+	// Create request
+	req, err := http.NewRequest("GET", urlStr, nil)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	// Set headers - user headers first
+	for k, v := range headers {
+		req.Header.Set(k, v)
+	}
+	// Only set default User-Agent if not provided by extension
+	if req.Header.Get("User-Agent") == "" {
+		req.Header.Set("User-Agent", "Spotiflac-Extension/1.0")
+	}
+
+	// Execute request
+	resp, err := r.httpClient.Do(req)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+	defer resp.Body.Close()
+
+	// Read body
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	// Extract response headers - return all values as arrays for multi-value headers (cookies, etc.)
+	respHeaders := make(map[string]interface{})
+	for k, v := range resp.Header {
+		if len(v) == 1 {
+			respHeaders[k] = v[0]
+		} else {
+			respHeaders[k] = v // Return as array if multiple values
+		}
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"statusCode": resp.StatusCode,
+		"status":     resp.StatusCode, // Alias for convenience
+		"ok":         resp.StatusCode >= 200 && resp.StatusCode < 300,
+		"body":       string(body),
+		"headers":    respHeaders,
+	})
+}
+
+// httpPost performs a POST request (sandboxed)
+func (r *ExtensionRuntime) httpPost(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": "URL is required",
+		})
+	}
+
+	urlStr := call.Arguments[0].String()
+
+	// Validate domain
+	if err := r.validateDomain(urlStr); err != nil {
+		GoLog("[Extension:%s] HTTP blocked: %v\n", r.extensionID, err)
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	// Get body if provided - support both string and object
+	var bodyStr string
+	if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) && !goja.IsNull(call.Arguments[1]) {
+		bodyArg := call.Arguments[1].Export()
+		switch v := bodyArg.(type) {
+		case string:
+			bodyStr = v
+		case map[string]interface{}, []interface{}:
+			// Auto-stringify objects and arrays to JSON
+			jsonBytes, err := json.Marshal(v)
+			if err != nil {
+				return r.vm.ToValue(map[string]interface{}{
+					"error": fmt.Sprintf("failed to stringify body: %v", err),
+				})
+			}
+			bodyStr = string(jsonBytes)
+		default:
+			// Fallback to string conversion
+			bodyStr = call.Arguments[1].String()
+		}
+	}
+
+	// Get headers if provided
+	headers := make(map[string]string)
+	if len(call.Arguments) > 2 && !goja.IsUndefined(call.Arguments[2]) && !goja.IsNull(call.Arguments[2]) {
+		headersObj := call.Arguments[2].Export()
+		if h, ok := headersObj.(map[string]interface{}); ok {
+			for k, v := range h {
+				headers[k] = fmt.Sprintf("%v", v)
+			}
+		}
+	}
+
+	// Create request
+	req, err := http.NewRequest("POST", urlStr, strings.NewReader(bodyStr))
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	// Set headers - user headers first
+	for k, v := range headers {
+		req.Header.Set(k, v)
+	}
+	// Only set defaults if not provided by extension
+	if req.Header.Get("User-Agent") == "" {
+		req.Header.Set("User-Agent", "Spotiflac-Extension/1.0")
+	}
+	if req.Header.Get("Content-Type") == "" {
+		req.Header.Set("Content-Type", "application/json")
+	}
+
+	// Execute request
+	resp, err := r.httpClient.Do(req)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+	defer resp.Body.Close()
+
+	// Read body
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	// Extract response headers - return all values as arrays for multi-value headers
+	respHeaders := make(map[string]interface{})
+	for k, v := range resp.Header {
+		if len(v) == 1 {
+			respHeaders[k] = v[0]
+		} else {
+			respHeaders[k] = v // Return as array if multiple values
+		}
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"statusCode": resp.StatusCode,
+		"status":     resp.StatusCode, // Alias for convenience
+		"ok":         resp.StatusCode >= 200 && resp.StatusCode < 300,
+		"body":       string(body),
+		"headers":    respHeaders,
+	})
+}
+
+// httpRequest performs a generic HTTP request (GET, POST, PUT, DELETE, etc.)
+// Usage: http.request(url, options) where options = { method, body, headers }
+func (r *ExtensionRuntime) httpRequest(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": "URL is required",
+		})
+	}
+
+	urlStr := call.Arguments[0].String()
+
+	// Validate domain
+	if err := r.validateDomain(urlStr); err != nil {
+		GoLog("[Extension:%s] HTTP blocked: %v\n", r.extensionID, err)
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	// Default options
+	method := "GET"
+	var bodyStr string
+	headers := make(map[string]string)
+
+	// Parse options if provided
+	if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) && !goja.IsNull(call.Arguments[1]) {
+		optionsObj := call.Arguments[1].Export()
+		if opts, ok := optionsObj.(map[string]interface{}); ok {
+			// Get method
+			if m, ok := opts["method"].(string); ok {
+				method = strings.ToUpper(m)
+			}
+
+			// Get body - support both string and object
+			if bodyArg, ok := opts["body"]; ok && bodyArg != nil {
+				switch v := bodyArg.(type) {
+				case string:
+					bodyStr = v
+				case map[string]interface{}, []interface{}:
+					// Auto-stringify objects and arrays to JSON
+					jsonBytes, err := json.Marshal(v)
+					if err != nil {
+						return r.vm.ToValue(map[string]interface{}{
+							"error": fmt.Sprintf("failed to stringify body: %v", err),
+						})
+					}
+					bodyStr = string(jsonBytes)
+				default:
+					bodyStr = fmt.Sprintf("%v", v)
+				}
+			}
+
+			// Get headers
+			if h, ok := opts["headers"].(map[string]interface{}); ok {
+				for k, v := range h {
+					headers[k] = fmt.Sprintf("%v", v)
+				}
+			}
+		}
+	}
+
+	// Create request
+	var reqBody io.Reader
+	if bodyStr != "" {
+		reqBody = strings.NewReader(bodyStr)
+	}
+
+	req, err := http.NewRequest(method, urlStr, reqBody)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	// Set headers - user headers first
+	for k, v := range headers {
+		req.Header.Set(k, v)
+	}
+	// Only set defaults if not provided by extension
+	if req.Header.Get("User-Agent") == "" {
+		req.Header.Set("User-Agent", "Spotiflac-Extension/1.0")
+	}
+	if bodyStr != "" && req.Header.Get("Content-Type") == "" {
+		req.Header.Set("Content-Type", "application/json")
+	}
+
+	// Execute request
+	resp, err := r.httpClient.Do(req)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+	defer resp.Body.Close()
+
+	// Read body
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	// Extract response headers - return all values as arrays for multi-value headers
+	respHeaders := make(map[string]interface{})
+	for k, v := range resp.Header {
+		if len(v) == 1 {
+			respHeaders[k] = v[0]
+		} else {
+			respHeaders[k] = v // Return as array if multiple values
+		}
+	}
+
+	// Return response with helper properties
+	return r.vm.ToValue(map[string]interface{}{
+		"statusCode": resp.StatusCode,
+		"status":     resp.StatusCode, // Alias for convenience
+		"ok":         resp.StatusCode >= 200 && resp.StatusCode < 300,
+		"body":       string(body),
+		"headers":    respHeaders,
+	})
+}
+
+// httpPut performs a PUT request (shortcut for http.request with method: "PUT")
+func (r *ExtensionRuntime) httpPut(call goja.FunctionCall) goja.Value {
+	return r.httpMethodShortcut("PUT", call)
+}
+
+// httpDelete performs a DELETE request (shortcut for http.request with method: "DELETE")
+func (r *ExtensionRuntime) httpDelete(call goja.FunctionCall) goja.Value {
+	return r.httpMethodShortcut("DELETE", call)
+}
+
+// httpPatch performs a PATCH request (shortcut for http.request with method: "PATCH")
+func (r *ExtensionRuntime) httpPatch(call goja.FunctionCall) goja.Value {
+	return r.httpMethodShortcut("PATCH", call)
+}
+
+// httpMethodShortcut is a helper for PUT/DELETE/PATCH shortcuts
+// Signature: http.put(url, body, headers) / http.delete(url, headers) / http.patch(url, body, headers)
+func (r *ExtensionRuntime) httpMethodShortcut(method string, call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": "URL is required",
+		})
+	}
+
+	urlStr := call.Arguments[0].String()
+
+	// Validate domain
+	if err := r.validateDomain(urlStr); err != nil {
+		GoLog("[Extension:%s] HTTP blocked: %v\n", r.extensionID, err)
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	var bodyStr string
+	headers := make(map[string]string)
+
+	// For DELETE, second arg is headers; for PUT/PATCH, second arg is body
+	if method == "DELETE" {
+		// http.delete(url, headers)
+		if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) && !goja.IsNull(call.Arguments[1]) {
+			headersObj := call.Arguments[1].Export()
+			if h, ok := headersObj.(map[string]interface{}); ok {
+				for k, v := range h {
+					headers[k] = fmt.Sprintf("%v", v)
+				}
+			}
+		}
+	} else {
+		// http.put(url, body, headers) / http.patch(url, body, headers)
+		if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) && !goja.IsNull(call.Arguments[1]) {
+			bodyArg := call.Arguments[1].Export()
+			switch v := bodyArg.(type) {
+			case string:
+				bodyStr = v
+			case map[string]interface{}, []interface{}:
+				jsonBytes, err := json.Marshal(v)
+				if err != nil {
+					return r.vm.ToValue(map[string]interface{}{
+						"error": fmt.Sprintf("failed to stringify body: %v", err),
+					})
+				}
+				bodyStr = string(jsonBytes)
+			default:
+				bodyStr = call.Arguments[1].String()
+			}
+		}
+
+		if len(call.Arguments) > 2 && !goja.IsUndefined(call.Arguments[2]) && !goja.IsNull(call.Arguments[2]) {
+			headersObj := call.Arguments[2].Export()
+			if h, ok := headersObj.(map[string]interface{}); ok {
+				for k, v := range h {
+					headers[k] = fmt.Sprintf("%v", v)
+				}
+			}
+		}
+	}
+
+	// Create request
+	var reqBody io.Reader
+	if bodyStr != "" {
+		reqBody = strings.NewReader(bodyStr)
+	}
+
+	req, err := http.NewRequest(method, urlStr, reqBody)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	// Set headers - user headers first
+	for k, v := range headers {
+		req.Header.Set(k, v)
+	}
+	if req.Header.Get("User-Agent") == "" {
+		req.Header.Set("User-Agent", "Spotiflac-Extension/1.0")
+	}
+	if bodyStr != "" && req.Header.Get("Content-Type") == "" {
+		req.Header.Set("Content-Type", "application/json")
+	}
+
+	// Execute request
+	resp, err := r.httpClient.Do(req)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+	defer resp.Body.Close()
+
+	// Read body
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	// Extract response headers
+	respHeaders := make(map[string]interface{})
+	for k, v := range resp.Header {
+		if len(v) == 1 {
+			respHeaders[k] = v[0]
+		} else {
+			respHeaders[k] = v
+		}
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"statusCode": resp.StatusCode,
+		"status":     resp.StatusCode,
+		"ok":         resp.StatusCode >= 200 && resp.StatusCode < 300,
+		"body":       string(body),
+		"headers":    respHeaders,
+	})
+}
+
+// httpClearCookies clears all cookies for this extension
+func (r *ExtensionRuntime) httpClearCookies(call goja.FunctionCall) goja.Value {
+	if jar, ok := r.cookieJar.(*simpleCookieJar); ok {
+		jar.mu.Lock()
+		jar.cookies = make(map[string][]*http.Cookie)
+		jar.mu.Unlock()
+		GoLog("[Extension:%s] Cookies cleared\n", r.extensionID)
+		return r.vm.ToValue(true)
+	}
+	return r.vm.ToValue(false)
+}
@@ -0,0 +1,151 @@
+// Package gobackend provides Track Matching API for extension runtime
+package gobackend
+
+import (
+	"strings"
+
+	"github.com/dop251/goja"
+)
+
+// ==================== Track Matching API ====================
+
+// matchingCompareStrings compares two strings with fuzzy matching
+func (r *ExtensionRuntime) matchingCompareStrings(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue(0.0)
+	}
+
+	str1 := strings.ToLower(strings.TrimSpace(call.Arguments[0].String()))
+	str2 := strings.ToLower(strings.TrimSpace(call.Arguments[1].String()))
+
+	if str1 == str2 {
+		return r.vm.ToValue(1.0)
+	}
+
+	// Calculate Levenshtein distance-based similarity
+	similarity := calculateStringSimilarity(str1, str2)
+	return r.vm.ToValue(similarity)
+}
+
+// matchingCompareDuration compares two durations with tolerance
+func (r *ExtensionRuntime) matchingCompareDuration(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue(false)
+	}
+
+	dur1 := int(call.Arguments[0].ToInteger())
+	dur2 := int(call.Arguments[1].ToInteger())
+
+	// Default tolerance: 3 seconds
+	tolerance := 3000 // milliseconds
+	if len(call.Arguments) > 2 && !goja.IsUndefined(call.Arguments[2]) {
+		tolerance = int(call.Arguments[2].ToInteger())
+	}
+
+	diff := dur1 - dur2
+	if diff < 0 {
+		diff = -diff
+	}
+
+	return r.vm.ToValue(diff <= tolerance)
+}
+
+// matchingNormalizeString normalizes a string for comparison
+func (r *ExtensionRuntime) matchingNormalizeString(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue("")
+	}
+
+	str := call.Arguments[0].String()
+	normalized := normalizeStringForMatching(str)
+	return r.vm.ToValue(normalized)
+}
+
+// calculateStringSimilarity calculates similarity between two strings (0-1)
+func calculateStringSimilarity(s1, s2 string) float64 {
+	if len(s1) == 0 && len(s2) == 0 {
+		return 1.0
+	}
+	if len(s1) == 0 || len(s2) == 0 {
+		return 0.0
+	}
+
+	// Use Levenshtein distance
+	distance := levenshteinDistance(s1, s2)
+	maxLen := len(s1)
+	if len(s2) > maxLen {
+		maxLen = len(s2)
+	}
+
+	return 1.0 - float64(distance)/float64(maxLen)
+}
+
+// levenshteinDistance calculates the Levenshtein distance between two strings
+func levenshteinDistance(s1, s2 string) int {
+	if len(s1) == 0 {
+		return len(s2)
+	}
+	if len(s2) == 0 {
+		return len(s1)
+	}
+
+	// Create matrix
+	matrix := make([][]int, len(s1)+1)
+	for i := range matrix {
+		matrix[i] = make([]int, len(s2)+1)
+		matrix[i][0] = i
+	}
+	for j := range matrix[0] {
+		matrix[0][j] = j
+	}
+
+	// Fill matrix
+	for i := 1; i <= len(s1); i++ {
+		for j := 1; j <= len(s2); j++ {
+			cost := 1
+			if s1[i-1] == s2[j-1] {
+				cost = 0
+			}
+			matrix[i][j] = min(
+				matrix[i-1][j]+1,      // deletion
+				matrix[i][j-1]+1,      // insertion
+				matrix[i-1][j-1]+cost, // substitution
+			)
+		}
+	}
+
+	return matrix[len(s1)][len(s2)]
+}
+
+// normalizeStringForMatching normalizes a string for comparison
+func normalizeStringForMatching(s string) string {
+	// Convert to lowercase
+	s = strings.ToLower(s)
+
+	// Remove common suffixes/prefixes
+	suffixes := []string{
+		" (remastered)", " (remaster)", " - remastered", " - remaster",
+		" (deluxe)", " (deluxe edition)", " - deluxe", " - deluxe edition",
+		" (explicit)", " (clean)", " [explicit]", " [clean]",
+		" (album version)", " (single version)", " (radio edit)",
+		" (feat.", " (ft.", " feat.", " ft.",
+	}
+	for _, suffix := range suffixes {
+		if idx := strings.Index(s, suffix); idx != -1 {
+			s = s[:idx]
+		}
+	}
+
+	// Remove special characters
+	var result strings.Builder
+	for _, r := range s {
+		if (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9') || r == ' ' {
+			result.WriteRune(r)
+		}
+	}
+
+	// Collapse multiple spaces
+	s = strings.Join(strings.Fields(result.String()), " ")
+
+	return strings.TrimSpace(s)
+}
@@ -0,0 +1,488 @@
+// Package gobackend provides Browser-like Polyfills for extension runtime
+package gobackend
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/dop251/goja"
+)
+
+// ==================== Browser-like Polyfills ====================
+// These polyfills make porting browser/Node.js libraries easier
+// without compromising sandbox security
+
+// fetchPolyfill implements browser-compatible fetch() API
+// Returns a Promise-like object with json(), text() methods
+func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.createFetchError("URL is required")
+	}
+
+	urlStr := call.Arguments[0].String()
+
+	// Validate domain
+	if err := r.validateDomain(urlStr); err != nil {
+		GoLog("[Extension:%s] fetch blocked: %v\n", r.extensionID, err)
+		return r.createFetchError(err.Error())
+	}
+
+	// Parse options
+	method := "GET"
+	var bodyStr string
+	headers := make(map[string]string)
+
+	if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) && !goja.IsNull(call.Arguments[1]) {
+		optionsObj := call.Arguments[1].Export()
+		if opts, ok := optionsObj.(map[string]interface{}); ok {
+			// Method
+			if m, ok := opts["method"].(string); ok {
+				method = strings.ToUpper(m)
+			}
+
+			// Body - support string, object (auto-stringify), or nil
+			if bodyArg, ok := opts["body"]; ok && bodyArg != nil {
+				switch v := bodyArg.(type) {
+				case string:
+					bodyStr = v
+				case map[string]interface{}, []interface{}:
+					jsonBytes, err := json.Marshal(v)
+					if err != nil {
+						return r.createFetchError(fmt.Sprintf("failed to stringify body: %v", err))
+					}
+					bodyStr = string(jsonBytes)
+				default:
+					bodyStr = fmt.Sprintf("%v", v)
+				}
+			}
+
+			// Headers
+			if h, ok := opts["headers"]; ok && h != nil {
+				switch hv := h.(type) {
+				case map[string]interface{}:
+					for k, v := range hv {
+						headers[k] = fmt.Sprintf("%v", v)
+					}
+				}
+			}
+		}
+	}
+
+	// Create HTTP request
+	var reqBody io.Reader
+	if bodyStr != "" {
+		reqBody = strings.NewReader(bodyStr)
+	}
+
+	req, err := http.NewRequest(method, urlStr, reqBody)
+	if err != nil {
+		return r.createFetchError(err.Error())
+	}
+
+	// Set headers - user headers first
+	for k, v := range headers {
+		req.Header.Set(k, v)
+	}
+	// Set defaults if not provided
+	if req.Header.Get("User-Agent") == "" {
+		req.Header.Set("User-Agent", "SpotiFLAC-Extension/1.0")
+	}
+	if bodyStr != "" && req.Header.Get("Content-Type") == "" {
+		req.Header.Set("Content-Type", "application/json")
+	}
+
+	// Execute request
+	resp, err := r.httpClient.Do(req)
+	if err != nil {
+		return r.createFetchError(err.Error())
+	}
+	defer resp.Body.Close()
+
+	// Read body
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return r.createFetchError(err.Error())
+	}
+
+	// Extract response headers
+	respHeaders := make(map[string]interface{})
+	for k, v := range resp.Header {
+		if len(v) == 1 {
+			respHeaders[k] = v[0]
+		} else {
+			respHeaders[k] = v
+		}
+	}
+
+	// Create Response object (browser-compatible)
+	responseObj := r.vm.NewObject()
+	responseObj.Set("ok", resp.StatusCode >= 200 && resp.StatusCode < 300)
+	responseObj.Set("status", resp.StatusCode)
+	responseObj.Set("statusText", http.StatusText(resp.StatusCode))
+	responseObj.Set("headers", respHeaders)
+	responseObj.Set("url", urlStr)
+
+	// Store body for methods
+	bodyString := string(body)
+
+	// text() method - returns body as string
+	responseObj.Set("text", func(call goja.FunctionCall) goja.Value {
+		return r.vm.ToValue(bodyString)
+	})
+
+	// json() method - parses body as JSON
+	responseObj.Set("json", func(call goja.FunctionCall) goja.Value {
+		var result interface{}
+		if err := json.Unmarshal(body, &result); err != nil {
+			GoLog("[Extension:%s] fetch json() parse error: %v\n", r.extensionID, err)
+			return goja.Undefined()
+		}
+		return r.vm.ToValue(result)
+	})
+
+	// arrayBuffer() method - returns body as array (simplified)
+	responseObj.Set("arrayBuffer", func(call goja.FunctionCall) goja.Value {
+		// Return as array of bytes
+		byteArray := make([]interface{}, len(body))
+		for i, b := range body {
+			byteArray[i] = int(b)
+		}
+		return r.vm.ToValue(byteArray)
+	})
+
+	return responseObj
+}
+
+// createFetchError creates a fetch error response
+func (r *ExtensionRuntime) createFetchError(message string) goja.Value {
+	errorObj := r.vm.NewObject()
+	errorObj.Set("ok", false)
+	errorObj.Set("status", 0)
+	errorObj.Set("statusText", "Network Error")
+	errorObj.Set("error", message)
+	errorObj.Set("text", func(call goja.FunctionCall) goja.Value {
+		return r.vm.ToValue("")
+	})
+	errorObj.Set("json", func(call goja.FunctionCall) goja.Value {
+		return goja.Undefined()
+	})
+	return errorObj
+}
+
+// atobPolyfill implements browser atob() - decode base64 to string
+func (r *ExtensionRuntime) atobPolyfill(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue("")
+	}
+	input := call.Arguments[0].String()
+	decoded, err := base64.StdEncoding.DecodeString(input)
+	if err != nil {
+		// Try URL-safe base64
+		decoded, err = base64.URLEncoding.DecodeString(input)
+		if err != nil {
+			GoLog("[Extension:%s] atob decode error: %v\n", r.extensionID, err)
+			return r.vm.ToValue("")
+		}
+	}
+	return r.vm.ToValue(string(decoded))
+}
+
+// btoaPolyfill implements browser btoa() - encode string to base64
+func (r *ExtensionRuntime) btoaPolyfill(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue("")
+	}
+	input := call.Arguments[0].String()
+	return r.vm.ToValue(base64.StdEncoding.EncodeToString([]byte(input)))
+}
+
+// registerTextEncoderDecoder registers TextEncoder and TextDecoder classes
+func (r *ExtensionRuntime) registerTextEncoderDecoder(vm *goja.Runtime) {
+	// TextEncoder constructor
+	vm.Set("TextEncoder", func(call goja.ConstructorCall) *goja.Object {
+		encoder := call.This
+		encoder.Set("encoding", "utf-8")
+
+		// encode() method - string to Uint8Array
+		encoder.Set("encode", func(call goja.FunctionCall) goja.Value {
+			if len(call.Arguments) < 1 {
+				return vm.ToValue([]byte{})
+			}
+			input := call.Arguments[0].String()
+			bytes := []byte(input)
+
+			// Return as array (Uint8Array-like)
+			result := make([]interface{}, len(bytes))
+			for i, b := range bytes {
+				result[i] = int(b)
+			}
+			return vm.ToValue(result)
+		})
+
+		// encodeInto() method
+		encoder.Set("encodeInto", func(call goja.FunctionCall) goja.Value {
+			// Simplified implementation
+			if len(call.Arguments) < 2 {
+				return vm.ToValue(map[string]interface{}{"read": 0, "written": 0})
+			}
+			input := call.Arguments[0].String()
+			return vm.ToValue(map[string]interface{}{
+				"read":    len(input),
+				"written": len([]byte(input)),
+			})
+		})
+
+		return nil
+	})
+
+	// TextDecoder constructor
+	vm.Set("TextDecoder", func(call goja.ConstructorCall) *goja.Object {
+		decoder := call.This
+
+		// Get encoding from arguments (default: utf-8)
+		encoding := "utf-8"
+		if len(call.Arguments) > 0 && !goja.IsUndefined(call.Arguments[0]) {
+			encoding = call.Arguments[0].String()
+		}
+		decoder.Set("encoding", encoding)
+		decoder.Set("fatal", false)
+		decoder.Set("ignoreBOM", false)
+
+		// decode() method - Uint8Array to string
+		decoder.Set("decode", func(call goja.FunctionCall) goja.Value {
+			if len(call.Arguments) < 1 {
+				return vm.ToValue("")
+			}
+
+			// Handle different input types
+			input := call.Arguments[0].Export()
+			var bytes []byte
+
+			switch v := input.(type) {
+			case []byte:
+				bytes = v
+			case []interface{}:
+				bytes = make([]byte, len(v))
+				for i, val := range v {
+					switch n := val.(type) {
+					case int64:
+						bytes[i] = byte(n)
+					case float64:
+						bytes[i] = byte(n)
+					case int:
+						bytes[i] = byte(n)
+					}
+				}
+			case string:
+				// Already a string, just return it
+				return vm.ToValue(v)
+			default:
+				return vm.ToValue("")
+			}
+
+			return vm.ToValue(string(bytes))
+		})
+
+		return nil
+	})
+}
+
+// registerURLClass registers the URL class for URL parsing
+func (r *ExtensionRuntime) registerURLClass(vm *goja.Runtime) {
+	vm.Set("URL", func(call goja.ConstructorCall) *goja.Object {
+		urlObj := call.This
+
+		if len(call.Arguments) < 1 {
+			urlObj.Set("href", "")
+			return nil
+		}
+
+		urlStr := call.Arguments[0].String()
+
+		// Handle relative URLs with base
+		if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) {
+			baseStr := call.Arguments[1].String()
+			baseURL, err := url.Parse(baseStr)
+			if err == nil {
+				relURL, err := url.Parse(urlStr)
+				if err == nil {
+					urlStr = baseURL.ResolveReference(relURL).String()
+				}
+			}
+		}
+
+		parsed, err := url.Parse(urlStr)
+		if err != nil {
+			urlObj.Set("href", urlStr)
+			return nil
+		}
+
+		// Set URL properties
+		urlObj.Set("href", parsed.String())
+		urlObj.Set("protocol", parsed.Scheme+":")
+		urlObj.Set("host", parsed.Host)
+		urlObj.Set("hostname", parsed.Hostname())
+		urlObj.Set("port", parsed.Port())
+		urlObj.Set("pathname", parsed.Path)
+		urlObj.Set("search", "")
+		if parsed.RawQuery != "" {
+			urlObj.Set("search", "?"+parsed.RawQuery)
+		}
+		urlObj.Set("hash", "")
+		if parsed.Fragment != "" {
+			urlObj.Set("hash", "#"+parsed.Fragment)
+		}
+		urlObj.Set("origin", parsed.Scheme+"://"+parsed.Host)
+		urlObj.Set("username", parsed.User.Username())
+		password, _ := parsed.User.Password()
+		urlObj.Set("password", password)
+
+		// searchParams object
+		searchParams := vm.NewObject()
+		queryValues := parsed.Query()
+
+		searchParams.Set("get", func(call goja.FunctionCall) goja.Value {
+			if len(call.Arguments) < 1 {
+				return goja.Null()
+			}
+			key := call.Arguments[0].String()
+			if val := queryValues.Get(key); val != "" {
+				return vm.ToValue(val)
+			}
+			return goja.Null()
+		})
+
+		searchParams.Set("getAll", func(call goja.FunctionCall) goja.Value {
+			if len(call.Arguments) < 1 {
+				return vm.ToValue([]string{})
+			}
+			key := call.Arguments[0].String()
+			return vm.ToValue(queryValues[key])
+		})
+
+		searchParams.Set("has", func(call goja.FunctionCall) goja.Value {
+			if len(call.Arguments) < 1 {
+				return vm.ToValue(false)
+			}
+			key := call.Arguments[0].String()
+			return vm.ToValue(queryValues.Has(key))
+		})
+
+		searchParams.Set("toString", func(call goja.FunctionCall) goja.Value {
+			return vm.ToValue(queryValues.Encode())
+		})
+
+		urlObj.Set("searchParams", searchParams)
+
+		// toString method
+		urlObj.Set("toString", func(call goja.FunctionCall) goja.Value {
+			return vm.ToValue(parsed.String())
+		})
+
+		// toJSON method
+		urlObj.Set("toJSON", func(call goja.FunctionCall) goja.Value {
+			return vm.ToValue(parsed.String())
+		})
+
+		return nil
+	})
+
+	// URLSearchParams constructor
+	vm.Set("URLSearchParams", func(call goja.ConstructorCall) *goja.Object {
+		paramsObj := call.This
+		values := url.Values{}
+
+		// Parse initial value if provided
+		if len(call.Arguments) > 0 && !goja.IsUndefined(call.Arguments[0]) {
+			init := call.Arguments[0].Export()
+			switch v := init.(type) {
+			case string:
+				// Parse query string
+				parsed, _ := url.ParseQuery(strings.TrimPrefix(v, "?"))
+				values = parsed
+			case map[string]interface{}:
+				for k, val := range v {
+					values.Set(k, fmt.Sprintf("%v", val))
+				}
+			}
+		}
+
+		paramsObj.Set("append", func(call goja.FunctionCall) goja.Value {
+			if len(call.Arguments) >= 2 {
+				values.Add(call.Arguments[0].String(), call.Arguments[1].String())
+			}
+			return goja.Undefined()
+		})
+
+		paramsObj.Set("delete", func(call goja.FunctionCall) goja.Value {
+			if len(call.Arguments) >= 1 {
+				values.Del(call.Arguments[0].String())
+			}
+			return goja.Undefined()
+		})
+
+		paramsObj.Set("get", func(call goja.FunctionCall) goja.Value {
+			if len(call.Arguments) < 1 {
+				return goja.Null()
+			}
+			if val := values.Get(call.Arguments[0].String()); val != "" {
+				return vm.ToValue(val)
+			}
+			return goja.Null()
+		})
+
+		paramsObj.Set("getAll", func(call goja.FunctionCall) goja.Value {
+			if len(call.Arguments) < 1 {
+				return vm.ToValue([]string{})
+			}
+			return vm.ToValue(values[call.Arguments[0].String()])
+		})
+
+		paramsObj.Set("has", func(call goja.FunctionCall) goja.Value {
+			if len(call.Arguments) < 1 {
+				return vm.ToValue(false)
+			}
+			return vm.ToValue(values.Has(call.Arguments[0].String()))
+		})
+
+		paramsObj.Set("set", func(call goja.FunctionCall) goja.Value {
+			if len(call.Arguments) >= 2 {
+				values.Set(call.Arguments[0].String(), call.Arguments[1].String())
+			}
+			return goja.Undefined()
+		})
+
+		paramsObj.Set("toString", func(call goja.FunctionCall) goja.Value {
+			return vm.ToValue(values.Encode())
+		})
+
+		return nil
+	})
+}
+
+// registerJSONGlobal ensures JSON global is properly set up
+func (r *ExtensionRuntime) registerJSONGlobal(vm *goja.Runtime) {
+	// JSON is already built-in to Goja, but we can enhance it
+	// This ensures JSON.parse and JSON.stringify work as expected
+
+	// The built-in JSON object should already work, but let's verify
+	// and add any missing functionality if needed
+	jsonScript := `
+		if (typeof JSON === 'undefined') {
+			var JSON = {
+				parse: function(text) {
+					return utils.parseJSON(text);
+				},
+				stringify: function(value, replacer, space) {
+					return utils.stringifyJSON(value);
+				}
+			};
+		}
+	`
+	_, _ = vm.RunString(jsonScript)
+}
@@ -0,0 +1,381 @@
+// Package gobackend provides Storage and Credentials API for extension runtime
+package gobackend
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+
+	"github.com/dop251/goja"
+)
+
+// ==================== Storage API ====================
+
+// getStoragePath returns the path to the extension's storage file
+func (r *ExtensionRuntime) getStoragePath() string {
+	return filepath.Join(r.dataDir, "storage.json")
+}
+
+// loadStorage loads the storage data from disk
+func (r *ExtensionRuntime) loadStorage() (map[string]interface{}, error) {
+	storagePath := r.getStoragePath()
+	data, err := os.ReadFile(storagePath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return make(map[string]interface{}), nil
+		}
+		return nil, err
+	}
+
+	var storage map[string]interface{}
+	if err := json.Unmarshal(data, &storage); err != nil {
+		return nil, err
+	}
+
+	return storage, nil
+}
+
+// saveStorage saves the storage data to disk
+func (r *ExtensionRuntime) saveStorage(storage map[string]interface{}) error {
+	storagePath := r.getStoragePath()
+	data, err := json.MarshalIndent(storage, "", "  ")
+	if err != nil {
+		return err
+	}
+
+	return os.WriteFile(storagePath, data, 0644)
+}
+
+// storageGet retrieves a value from storage
+func (r *ExtensionRuntime) storageGet(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return goja.Undefined()
+	}
+
+	key := call.Arguments[0].String()
+
+	storage, err := r.loadStorage()
+	if err != nil {
+		GoLog("[Extension:%s] Storage load error: %v\n", r.extensionID, err)
+		return goja.Undefined()
+	}
+
+	value, exists := storage[key]
+	if !exists {
+		// Return default value if provided
+		if len(call.Arguments) > 1 {
+			return call.Arguments[1]
+		}
+		return goja.Undefined()
+	}
+
+	return r.vm.ToValue(value)
+}
+
+// storageSet stores a value in storage
+func (r *ExtensionRuntime) storageSet(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue(false)
+	}
+
+	key := call.Arguments[0].String()
+	value := call.Arguments[1].Export()
+
+	storage, err := r.loadStorage()
+	if err != nil {
+		GoLog("[Extension:%s] Storage load error: %v\n", r.extensionID, err)
+		return r.vm.ToValue(false)
+	}
+
+	storage[key] = value
+
+	if err := r.saveStorage(storage); err != nil {
+		GoLog("[Extension:%s] Storage save error: %v\n", r.extensionID, err)
+		return r.vm.ToValue(false)
+	}
+
+	return r.vm.ToValue(true)
+}
+
+// storageRemove removes a value from storage
+func (r *ExtensionRuntime) storageRemove(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(false)
+	}
+
+	key := call.Arguments[0].String()
+
+	storage, err := r.loadStorage()
+	if err != nil {
+		GoLog("[Extension:%s] Storage load error: %v\n", r.extensionID, err)
+		return r.vm.ToValue(false)
+	}
+
+	delete(storage, key)
+
+	if err := r.saveStorage(storage); err != nil {
+		GoLog("[Extension:%s] Storage save error: %v\n", r.extensionID, err)
+		return r.vm.ToValue(false)
+	}
+
+	return r.vm.ToValue(true)
+}
+
+// ==================== Credentials API (Encrypted Storage) ====================
+
+// getCredentialsPath returns the path to the extension's encrypted credentials file
+func (r *ExtensionRuntime) getCredentialsPath() string {
+	return filepath.Join(r.dataDir, ".credentials.enc")
+}
+
+// getSaltPath returns the path to the extension's encryption salt file
+func (r *ExtensionRuntime) getSaltPath() string {
+	return filepath.Join(r.dataDir, ".cred_salt")
+}
+
+// getOrCreateSalt gets existing salt or creates a new random one
+func (r *ExtensionRuntime) getOrCreateSalt() ([]byte, error) {
+	saltPath := r.getSaltPath()
+
+	// Try to read existing salt
+	salt, err := os.ReadFile(saltPath)
+	if err == nil && len(salt) == 32 {
+		return salt, nil
+	}
+
+	// Generate new random salt (32 bytes)
+	salt = make([]byte, 32)
+	if _, err := io.ReadFull(rand.Reader, salt); err != nil {
+		return nil, fmt.Errorf("failed to generate salt: %w", err)
+	}
+
+	// Save salt to file
+	if err := os.WriteFile(saltPath, salt, 0600); err != nil {
+		return nil, fmt.Errorf("failed to save salt: %w", err)
+	}
+
+	return salt, nil
+}
+
+// getEncryptionKey derives an encryption key from extension ID + random salt
+func (r *ExtensionRuntime) getEncryptionKey() ([]byte, error) {
+	// Get or create per-installation random salt
+	salt, err := r.getOrCreateSalt()
+	if err != nil {
+		return nil, err
+	}
+
+	// Combine extension ID + random salt for key derivation
+	// This makes each installation unique, preventing mass decryption attacks
+	combined := append([]byte(r.extensionID), salt...)
+	hash := sha256.Sum256(combined)
+	return hash[:], nil
+}
+
+// loadCredentials loads and decrypts credentials from disk
+func (r *ExtensionRuntime) loadCredentials() (map[string]interface{}, error) {
+	credPath := r.getCredentialsPath()
+	data, err := os.ReadFile(credPath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return make(map[string]interface{}), nil
+		}
+		return nil, err
+	}
+
+	// Decrypt the data
+	key, err := r.getEncryptionKey()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get encryption key: %w", err)
+	}
+	decrypted, err := decryptAES(data, key)
+	if err != nil {
+		return nil, fmt.Errorf("failed to decrypt credentials: %w", err)
+	}
+
+	var creds map[string]interface{}
+	if err := json.Unmarshal(decrypted, &creds); err != nil {
+		return nil, err
+	}
+
+	return creds, nil
+}
+
+// saveCredentials encrypts and saves credentials to disk
+func (r *ExtensionRuntime) saveCredentials(creds map[string]interface{}) error {
+	data, err := json.Marshal(creds)
+	if err != nil {
+		return err
+	}
+
+	// Encrypt the data
+	key, err := r.getEncryptionKey()
+	if err != nil {
+		return fmt.Errorf("failed to get encryption key: %w", err)
+	}
+	encrypted, err := encryptAES(data, key)
+	if err != nil {
+		return fmt.Errorf("failed to encrypt credentials: %w", err)
+	}
+
+	credPath := r.getCredentialsPath()
+	return os.WriteFile(credPath, encrypted, 0600) // Restrictive permissions
+}
+
+// credentialsStore stores an encrypted credential
+func (r *ExtensionRuntime) credentialsStore(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "key and value are required",
+		})
+	}
+
+	key := call.Arguments[0].String()
+	value := call.Arguments[1].Export()
+
+	creds, err := r.loadCredentials()
+	if err != nil {
+		GoLog("[Extension:%s] Credentials load error: %v\n", r.extensionID, err)
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	creds[key] = value
+
+	if err := r.saveCredentials(creds); err != nil {
+		GoLog("[Extension:%s] Credentials save error: %v\n", r.extensionID, err)
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success": true,
+	})
+}
+
+// credentialsGet retrieves a decrypted credential
+func (r *ExtensionRuntime) credentialsGet(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return goja.Undefined()
+	}
+
+	key := call.Arguments[0].String()
+
+	creds, err := r.loadCredentials()
+	if err != nil {
+		GoLog("[Extension:%s] Credentials load error: %v\n", r.extensionID, err)
+		return goja.Undefined()
+	}
+
+	value, exists := creds[key]
+	if !exists {
+		// Return default value if provided
+		if len(call.Arguments) > 1 {
+			return call.Arguments[1]
+		}
+		return goja.Undefined()
+	}
+
+	return r.vm.ToValue(value)
+}
+
+// credentialsRemove removes a credential
+func (r *ExtensionRuntime) credentialsRemove(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(false)
+	}
+
+	key := call.Arguments[0].String()
+
+	creds, err := r.loadCredentials()
+	if err != nil {
+		GoLog("[Extension:%s] Credentials load error: %v\n", r.extensionID, err)
+		return r.vm.ToValue(false)
+	}
+
+	delete(creds, key)
+
+	if err := r.saveCredentials(creds); err != nil {
+		GoLog("[Extension:%s] Credentials save error: %v\n", r.extensionID, err)
+		return r.vm.ToValue(false)
+	}
+
+	return r.vm.ToValue(true)
+}
+
+// credentialsHas checks if a credential exists
+func (r *ExtensionRuntime) credentialsHas(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue(false)
+	}
+
+	key := call.Arguments[0].String()
+
+	creds, err := r.loadCredentials()
+	if err != nil {
+		return r.vm.ToValue(false)
+	}
+
+	_, exists := creds[key]
+	return r.vm.ToValue(exists)
+}
+
+// ==================== Crypto Utilities ====================
+
+// encryptAES encrypts data using AES-GCM
+func encryptAES(plaintext []byte, key []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return nil, err
+	}
+
+	nonce := make([]byte, gcm.NonceSize())
+	if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
+		return nil, err
+	}
+
+	ciphertext := gcm.Seal(nonce, nonce, plaintext, nil)
+	return ciphertext, nil
+}
+
+// decryptAES decrypts data using AES-GCM
+func decryptAES(ciphertext []byte, key []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return nil, err
+	}
+
+	nonceSize := gcm.NonceSize()
+	if len(ciphertext) < nonceSize {
+		return nil, fmt.Errorf("ciphertext too short")
+	}
+
+	nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
+	plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return plaintext, nil
+}
@@ -0,0 +1,372 @@
+// Package gobackend provides Utility functions for extension runtime
+package gobackend
+
+import (
+	"crypto/hmac"
+	"crypto/md5"
+	"crypto/rand"
+	"crypto/sha1"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/dop251/goja"
+)
+
+// ==================== Utility Functions ====================
+
+// base64Encode encodes a string to base64
+func (r *ExtensionRuntime) base64Encode(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue("")
+	}
+	input := call.Arguments[0].String()
+	return r.vm.ToValue(base64.StdEncoding.EncodeToString([]byte(input)))
+}
+
+// base64Decode decodes a base64 string
+func (r *ExtensionRuntime) base64Decode(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue("")
+	}
+	input := call.Arguments[0].String()
+	decoded, err := base64.StdEncoding.DecodeString(input)
+	if err != nil {
+		return r.vm.ToValue("")
+	}
+	return r.vm.ToValue(string(decoded))
+}
+
+// md5Hash computes MD5 hash of a string
+func (r *ExtensionRuntime) md5Hash(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue("")
+	}
+	input := call.Arguments[0].String()
+	hash := md5.Sum([]byte(input))
+	return r.vm.ToValue(hex.EncodeToString(hash[:]))
+}
+
+// sha256Hash computes SHA256 hash of a string
+func (r *ExtensionRuntime) sha256Hash(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue("")
+	}
+	input := call.Arguments[0].String()
+	hash := sha256.Sum256([]byte(input))
+	return r.vm.ToValue(hex.EncodeToString(hash[:]))
+}
+
+// hmacSHA256 computes HMAC-SHA256 of a message with a key
+func (r *ExtensionRuntime) hmacSHA256(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue("")
+	}
+	message := call.Arguments[0].String()
+	key := call.Arguments[1].String()
+
+	mac := hmac.New(sha256.New, []byte(key))
+	mac.Write([]byte(message))
+	return r.vm.ToValue(hex.EncodeToString(mac.Sum(nil)))
+}
+
+// hmacSHA256Base64 computes HMAC-SHA256 and returns base64 encoded result
+func (r *ExtensionRuntime) hmacSHA256Base64(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue("")
+	}
+	message := call.Arguments[0].String()
+	key := call.Arguments[1].String()
+
+	mac := hmac.New(sha256.New, []byte(key))
+	mac.Write([]byte(message))
+	return r.vm.ToValue(base64.StdEncoding.EncodeToString(mac.Sum(nil)))
+}
+
+// hmacSHA1 computes HMAC-SHA1 of a message with a key (for TOTP)
+// Arguments: message (string or array of bytes), key (string or array of bytes)
+// Returns: array of bytes (for TOTP dynamic truncation)
+func (r *ExtensionRuntime) hmacSHA1(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue([]byte{})
+	}
+
+	// Get key - can be string or array of bytes
+	var keyBytes []byte
+	keyArg := call.Arguments[0].Export()
+	switch k := keyArg.(type) {
+	case string:
+		keyBytes = []byte(k)
+	case []interface{}:
+		keyBytes = make([]byte, len(k))
+		for i, v := range k {
+			if num, ok := v.(int64); ok {
+				keyBytes[i] = byte(num)
+			} else if num, ok := v.(float64); ok {
+				keyBytes[i] = byte(int(num))
+			}
+		}
+	default:
+		return r.vm.ToValue([]byte{})
+	}
+
+	// Get message - can be string or array of bytes
+	var msgBytes []byte
+	msgArg := call.Arguments[1].Export()
+	switch m := msgArg.(type) {
+	case string:
+		msgBytes = []byte(m)
+	case []interface{}:
+		msgBytes = make([]byte, len(m))
+		for i, v := range m {
+			if num, ok := v.(int64); ok {
+				msgBytes[i] = byte(num)
+			} else if num, ok := v.(float64); ok {
+				msgBytes[i] = byte(int(num))
+			}
+		}
+	default:
+		return r.vm.ToValue([]byte{})
+	}
+
+	mac := hmac.New(sha1.New, keyBytes)
+	mac.Write(msgBytes)
+	result := mac.Sum(nil)
+
+	// Convert to array of numbers for JavaScript
+	jsArray := make([]interface{}, len(result))
+	for i, b := range result {
+		jsArray[i] = int(b)
+	}
+	return r.vm.ToValue(jsArray)
+}
+
+// parseJSON parses a JSON string
+func (r *ExtensionRuntime) parseJSON(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return goja.Undefined()
+	}
+	input := call.Arguments[0].String()
+
+	var result interface{}
+	if err := json.Unmarshal([]byte(input), &result); err != nil {
+		GoLog("[Extension:%s] JSON parse error: %v\n", r.extensionID, err)
+		return goja.Undefined()
+	}
+
+	return r.vm.ToValue(result)
+}
+
+// stringifyJSON converts a value to JSON string
+func (r *ExtensionRuntime) stringifyJSON(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue("")
+	}
+	input := call.Arguments[0].Export()
+
+	data, err := json.Marshal(input)
+	if err != nil {
+		GoLog("[Extension:%s] JSON stringify error: %v\n", r.extensionID, err)
+		return r.vm.ToValue("")
+	}
+
+	return r.vm.ToValue(string(data))
+}
+
+// ==================== Crypto Utilities for Extensions ====================
+
+// cryptoEncrypt encrypts a string using AES-GCM (for extension use)
+func (r *ExtensionRuntime) cryptoEncrypt(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "plaintext and key are required",
+		})
+	}
+
+	plaintext := call.Arguments[0].String()
+	keyStr := call.Arguments[1].String()
+
+	// Derive 32-byte key from provided key string
+	keyHash := sha256.Sum256([]byte(keyStr))
+
+	encrypted, err := encryptAES([]byte(plaintext), keyHash[:])
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success": true,
+		"data":    base64.StdEncoding.EncodeToString(encrypted),
+	})
+}
+
+// cryptoDecrypt decrypts a string using AES-GCM (for extension use)
+func (r *ExtensionRuntime) cryptoDecrypt(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 2 {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "ciphertext and key are required",
+		})
+	}
+
+	ciphertextB64 := call.Arguments[0].String()
+	keyStr := call.Arguments[1].String()
+
+	ciphertext, err := base64.StdEncoding.DecodeString(ciphertextB64)
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   "invalid base64 ciphertext",
+		})
+	}
+
+	// Derive 32-byte key from provided key string
+	keyHash := sha256.Sum256([]byte(keyStr))
+
+	decrypted, err := decryptAES(ciphertext, keyHash[:])
+	if err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success": true,
+		"data":    string(decrypted),
+	})
+}
+
+// cryptoGenerateKey generates a random encryption key
+func (r *ExtensionRuntime) cryptoGenerateKey(call goja.FunctionCall) goja.Value {
+	length := 32 // Default 256-bit key
+	if len(call.Arguments) > 0 && !goja.IsUndefined(call.Arguments[0]) {
+		if l, ok := call.Arguments[0].Export().(float64); ok {
+			length = int(l)
+		}
+	}
+
+	key := make([]byte, length)
+	if _, err := rand.Read(key); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
+	return r.vm.ToValue(map[string]interface{}{
+		"success": true,
+		"key":     base64.StdEncoding.EncodeToString(key),
+		"hex":     hex.EncodeToString(key),
+	})
+}
+
+// ==================== Logging Functions ====================
+
+func (r *ExtensionRuntime) logDebug(call goja.FunctionCall) goja.Value {
+	msg := r.formatLogArgs(call.Arguments)
+	GoLog("[Extension:%s:DEBUG] %s\n", r.extensionID, msg)
+	return goja.Undefined()
+}
+
+func (r *ExtensionRuntime) logInfo(call goja.FunctionCall) goja.Value {
+	msg := r.formatLogArgs(call.Arguments)
+	GoLog("[Extension:%s:INFO] %s\n", r.extensionID, msg)
+	return goja.Undefined()
+}
+
+func (r *ExtensionRuntime) logWarn(call goja.FunctionCall) goja.Value {
+	msg := r.formatLogArgs(call.Arguments)
+	GoLog("[Extension:%s:WARN] %s\n", r.extensionID, msg)
+	return goja.Undefined()
+}
+
+func (r *ExtensionRuntime) logError(call goja.FunctionCall) goja.Value {
+	msg := r.formatLogArgs(call.Arguments)
+	GoLog("[Extension:%s:ERROR] %s\n", r.extensionID, msg)
+	return goja.Undefined()
+}
+
+func (r *ExtensionRuntime) formatLogArgs(args []goja.Value) string {
+	parts := make([]string, len(args))
+	for i, arg := range args {
+		parts[i] = fmt.Sprintf("%v", arg.Export())
+	}
+	return strings.Join(parts, " ")
+}
+
+// ==================== Go Backend Wrappers ====================
+
+func (r *ExtensionRuntime) sanitizeFilenameWrapper(call goja.FunctionCall) goja.Value {
+	if len(call.Arguments) < 1 {
+		return r.vm.ToValue("")
+	}
+	input := call.Arguments[0].String()
+	return r.vm.ToValue(sanitizeFilename(input))
+}
+
+// RegisterGoBackendAPIs adds more Go backend functions to the VM
+func (r *ExtensionRuntime) RegisterGoBackendAPIs(vm *goja.Runtime) {
+	gobackendObj := vm.Get("gobackend")
+	if gobackendObj == nil || goja.IsUndefined(gobackendObj) {
+		gobackendObj = vm.NewObject()
+		vm.Set("gobackend", gobackendObj)
+	}
+
+	obj := gobackendObj.(*goja.Object)
+
+	// Expose sanitizeFilename
+	obj.Set("sanitizeFilename", func(call goja.FunctionCall) goja.Value {
+		if len(call.Arguments) < 1 {
+			return vm.ToValue("")
+		}
+		return vm.ToValue(sanitizeFilename(call.Arguments[0].String()))
+	})
+
+	// Expose getAudioQuality
+	obj.Set("getAudioQuality", func(call goja.FunctionCall) goja.Value {
+		if len(call.Arguments) < 1 {
+			return vm.ToValue(map[string]interface{}{
+				"error": "file path is required",
+			})
+		}
+
+		filePath := call.Arguments[0].String()
+		quality, err := GetAudioQuality(filePath)
+		if err != nil {
+			return vm.ToValue(map[string]interface{}{
+				"error": err.Error(),
+			})
+		}
+
+		return vm.ToValue(map[string]interface{}{
+			"bitDepth":     quality.BitDepth,
+			"sampleRate":   quality.SampleRate,
+			"totalSamples": quality.TotalSamples,
+		})
+	})
+
+	// Expose buildFilename
+	obj.Set("buildFilename", func(call goja.FunctionCall) goja.Value {
+		if len(call.Arguments) < 2 {
+			return vm.ToValue("")
+		}
+
+		template := call.Arguments[0].String()
+		metadataObj := call.Arguments[1].Export()
+
+		metadata, ok := metadataObj.(map[string]interface{})
+		if !ok {
+			return vm.ToValue("")
+		}
+
+		return vm.ToValue(buildFilenameFromTemplate(template, metadata))
+	})
+}
@@ -0,0 +1,221 @@
+// Package gobackend provides extension settings storage
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sync"
+)
+
+// ExtensionSettingsStore manages settings for all extensions
+type ExtensionSettingsStore struct {
+	mu       sync.RWMutex
+	dataDir  string
+	settings map[string]map[string]interface{} // extensionID -> settings
+}
+
+// Global settings store
+var (
+	globalSettingsStore     *ExtensionSettingsStore
+	globalSettingsStoreOnce sync.Once
+)
+
+// GetExtensionSettingsStore returns the global settings store
+func GetExtensionSettingsStore() *ExtensionSettingsStore {
+	globalSettingsStoreOnce.Do(func() {
+		globalSettingsStore = &ExtensionSettingsStore{
+			settings: make(map[string]map[string]interface{}),
+		}
+	})
+	return globalSettingsStore
+}
+
+// SetDataDir sets the data directory for settings storage
+func (s *ExtensionSettingsStore) SetDataDir(dataDir string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	s.dataDir = dataDir
+	if err := os.MkdirAll(dataDir, 0755); err != nil {
+		return fmt.Errorf("failed to create settings directory: %w", err)
+	}
+
+	// Load all existing settings
+	return s.loadAllSettings()
+}
+
+// getSettingsPath returns the path to an extension's settings file
+func (s *ExtensionSettingsStore) getSettingsPath(extensionID string) string {
+	return filepath.Join(s.dataDir, extensionID, "settings.json")
+}
+
+// loadAllSettings loads settings for all extensions from disk
+func (s *ExtensionSettingsStore) loadAllSettings() error {
+	entries, err := os.ReadDir(s.dataDir)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
+		return err
+	}
+
+	for _, entry := range entries {
+		if entry.IsDir() {
+			extensionID := entry.Name()
+			settings, err := s.loadSettings(extensionID)
+			if err != nil {
+				GoLog("[ExtensionSettings] Failed to load settings for %s: %v\n", extensionID, err)
+				continue
+			}
+			s.settings[extensionID] = settings
+		}
+	}
+
+	return nil
+}
+
+// loadSettings loads settings for a specific extension
+func (s *ExtensionSettingsStore) loadSettings(extensionID string) (map[string]interface{}, error) {
+	settingsPath := s.getSettingsPath(extensionID)
+	data, err := os.ReadFile(settingsPath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return make(map[string]interface{}), nil
+		}
+		return nil, err
+	}
+
+	var settings map[string]interface{}
+	if err := json.Unmarshal(data, &settings); err != nil {
+		return nil, err
+	}
+
+	return settings, nil
+}
+
+// saveSettings saves settings for a specific extension
+func (s *ExtensionSettingsStore) saveSettings(extensionID string, settings map[string]interface{}) error {
+	settingsPath := s.getSettingsPath(extensionID)
+
+	// Create directory if needed
+	dir := filepath.Dir(settingsPath)
+	if err := os.MkdirAll(dir, 0755); err != nil {
+		return err
+	}
+
+	data, err := json.MarshalIndent(settings, "", "  ")
+	if err != nil {
+		return err
+	}
+
+	return os.WriteFile(settingsPath, data, 0644)
+}
+
+// Get retrieves a setting value for an extension
+// Returns error if extension or key not found (gomobile compatible)
+func (s *ExtensionSettingsStore) Get(extensionID, key string) (interface{}, error) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	extSettings, exists := s.settings[extensionID]
+	if !exists {
+		return nil, fmt.Errorf("extension '%s' settings not found", extensionID)
+	}
+
+	value, exists := extSettings[key]
+	if !exists {
+		return nil, fmt.Errorf("setting '%s' not found for extension '%s'", key, extensionID)
+	}
+	return value, nil
+}
+
+// GetAll retrieves all settings for an extension
+func (s *ExtensionSettingsStore) GetAll(extensionID string) map[string]interface{} {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	extSettings, exists := s.settings[extensionID]
+	if !exists {
+		return make(map[string]interface{})
+	}
+
+	// Return a copy
+	result := make(map[string]interface{})
+	for k, v := range extSettings {
+		result[k] = v
+	}
+	return result
+}
+
+// Set stores a setting value for an extension
+func (s *ExtensionSettingsStore) Set(extensionID, key string, value interface{}) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if _, exists := s.settings[extensionID]; !exists {
+		s.settings[extensionID] = make(map[string]interface{})
+	}
+
+	s.settings[extensionID][key] = value
+
+	// Persist to disk
+	return s.saveSettings(extensionID, s.settings[extensionID])
+}
+
+// SetAll stores all settings for an extension
+func (s *ExtensionSettingsStore) SetAll(extensionID string, settings map[string]interface{}) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	s.settings[extensionID] = settings
+
+	// Persist to disk
+	return s.saveSettings(extensionID, settings)
+}
+
+// Remove removes a setting for an extension
+func (s *ExtensionSettingsStore) Remove(extensionID, key string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	extSettings, exists := s.settings[extensionID]
+	if !exists {
+		return nil
+	}
+
+	delete(extSettings, key)
+
+	// Persist to disk
+	return s.saveSettings(extensionID, extSettings)
+}
+
+// RemoveAll removes all settings for an extension
+func (s *ExtensionSettingsStore) RemoveAll(extensionID string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	delete(s.settings, extensionID)
+
+	// Remove settings file
+	settingsPath := s.getSettingsPath(extensionID)
+	if err := os.Remove(settingsPath); err != nil && !os.IsNotExist(err) {
+		return err
+	}
+
+	return nil
+}
+
+// GetAllExtensionSettings returns settings for all extensions as JSON
+func (s *ExtensionSettingsStore) GetAllExtensionSettingsJSON() (string, error) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	data, err := json.Marshal(s.settings)
+	if err != nil {
+		return "", err
+	}
+
+	return string(data), nil
+}
@@ -0,0 +1,453 @@
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+)
+
+// Extension categories
+const (
+	CategoryMetadata    = "metadata"
+	CategoryDownload    = "download"
+	CategoryUtility     = "utility"
+	CategoryLyrics      = "lyrics"
+	CategoryIntegration = "integration"
+)
+
+// StoreExtension represents an extension in the store
+type StoreExtension struct {
+	ID            string   `json:"id"`
+	Name          string   `json:"name"`
+	DisplayName   string   `json:"display_name,omitempty"`
+	Version       string   `json:"version"`
+	Author        string   `json:"author"`
+	Description   string   `json:"description"`
+	DownloadURL   string   `json:"download_url,omitempty"`
+	IconURL       string   `json:"icon_url,omitempty"`
+	Category      string   `json:"category"`
+	Tags          []string `json:"tags,omitempty"`
+	Downloads     int      `json:"downloads"`
+	UpdatedAt     string   `json:"updated_at"`
+	MinAppVersion string   `json:"min_app_version,omitempty"`
+	// Alternative camelCase fields (for flexibility)
+	DisplayNameAlt   string `json:"displayName,omitempty"`
+	DownloadURLAlt   string `json:"downloadUrl,omitempty"`
+	IconURLAlt       string `json:"iconUrl,omitempty"`
+	MinAppVersionAlt string `json:"minAppVersion,omitempty"`
+}
+
+// getDisplayName returns display name, falling back to name (private to avoid gomobile conflict)
+func (e *StoreExtension) getDisplayName() string {
+	if e.DisplayName != "" {
+		return e.DisplayName
+	}
+	if e.DisplayNameAlt != "" {
+		return e.DisplayNameAlt
+	}
+	return e.Name
+}
+
+// getDownloadURL returns download URL from either field (private to avoid gomobile conflict)
+func (e *StoreExtension) getDownloadURL() string {
+	if e.DownloadURL != "" {
+		return e.DownloadURL
+	}
+	return e.DownloadURLAlt
+}
+
+// getIconURL returns icon URL from either field (private to avoid gomobile conflict)
+func (e *StoreExtension) getIconURL() string {
+	if e.IconURL != "" {
+		return e.IconURL
+	}
+	return e.IconURLAlt
+}
+
+// getMinAppVersion returns min app version from either field (private to avoid gomobile conflict)
+func (e *StoreExtension) getMinAppVersion() string {
+	if e.MinAppVersion != "" {
+		return e.MinAppVersion
+	}
+	return e.MinAppVersionAlt
+}
+
+// StoreRegistry represents the extension registry
+type StoreRegistry struct {
+	Version    int              `json:"version"`
+	UpdatedAt  string           `json:"updated_at"`
+	Extensions []StoreExtension `json:"extensions"`
+}
+
+// StoreExtensionResponse is the normalized response sent to Flutter
+type StoreExtensionResponse struct {
+	ID               string   `json:"id"`
+	Name             string   `json:"name"`
+	DisplayName      string   `json:"display_name"`
+	Version          string   `json:"version"`
+	Author           string   `json:"author"`
+	Description      string   `json:"description"`
+	DownloadURL      string   `json:"download_url"`
+	IconURL          string   `json:"icon_url,omitempty"`
+	Category         string   `json:"category"`
+	Tags             []string `json:"tags,omitempty"`
+	Downloads        int      `json:"downloads"`
+	UpdatedAt        string   `json:"updated_at"`
+	MinAppVersion    string   `json:"min_app_version,omitempty"`
+	IsInstalled      bool     `json:"is_installed"`
+	InstalledVersion string   `json:"installed_version,omitempty"`
+	HasUpdate        bool     `json:"has_update"`
+}
+
+// ToResponse converts StoreExtension to normalized response
+func (e *StoreExtension) ToResponse() StoreExtensionResponse {
+	return StoreExtensionResponse{
+		ID:            e.ID,
+		Name:          e.Name,
+		DisplayName:   e.getDisplayName(),
+		Version:       e.Version,
+		Author:        e.Author,
+		Description:   e.Description,
+		DownloadURL:   e.getDownloadURL(),
+		IconURL:       e.getIconURL(),
+		Category:      e.Category,
+		Tags:          e.Tags,
+		Downloads:     e.Downloads,
+		UpdatedAt:     e.UpdatedAt,
+		MinAppVersion: e.getMinAppVersion(),
+	}
+}
+
+// ExtensionStore manages the extension store
+type ExtensionStore struct {
+	registryURL string
+	cacheDir    string
+	cache       *StoreRegistry
+	cacheMu     sync.RWMutex
+	cacheTime   time.Time
+	cacheTTL    time.Duration
+}
+
+var (
+	extensionStore   *ExtensionStore
+	extensionStoreMu sync.Mutex
+)
+
+const (
+	defaultRegistryURL = "https://raw.githubusercontent.com/zarzet/SpotiFLAC-Extension/main/registry.json"
+	cacheTTL           = 30 * time.Minute
+	cacheFileName      = "store_cache.json"
+)
+
+// InitExtensionStore initializes the extension store
+func InitExtensionStore(cacheDir string) *ExtensionStore {
+	extensionStoreMu.Lock()
+	defer extensionStoreMu.Unlock()
+
+	if extensionStore == nil {
+		extensionStore = &ExtensionStore{
+			registryURL: defaultRegistryURL,
+			cacheDir:    cacheDir,
+			cacheTTL:    cacheTTL,
+		}
+		// Try to load from disk cache
+		extensionStore.loadDiskCache()
+	}
+	return extensionStore
+}
+
+// GetExtensionStore returns the singleton store instance
+func GetExtensionStore() *ExtensionStore {
+	extensionStoreMu.Lock()
+	defer extensionStoreMu.Unlock()
+	return extensionStore
+}
+
+// loadDiskCache loads cached registry from disk
+func (s *ExtensionStore) loadDiskCache() {
+	if s.cacheDir == "" {
+		return
+	}
+
+	cachePath := filepath.Join(s.cacheDir, cacheFileName)
+	data, err := os.ReadFile(cachePath)
+	if err != nil {
+		return
+	}
+
+	var cacheData struct {
+		Registry  StoreRegistry `json:"registry"`
+		CacheTime int64         `json:"cache_time"`
+	}
+
+	if err := json.Unmarshal(data, &cacheData); err != nil {
+		return
+	}
+
+	s.cache = &cacheData.Registry
+	s.cacheTime = time.Unix(cacheData.CacheTime, 0)
+	LogDebug("ExtensionStore", "Loaded %d extensions from disk cache", len(s.cache.Extensions))
+}
+
+// saveDiskCache saves registry to disk cache
+func (s *ExtensionStore) saveDiskCache() {
+	if s.cacheDir == "" || s.cache == nil {
+		return
+	}
+
+	cacheData := struct {
+		Registry  StoreRegistry `json:"registry"`
+		CacheTime int64         `json:"cache_time"`
+	}{
+		Registry:  *s.cache,
+		CacheTime: s.cacheTime.Unix(),
+	}
+
+	data, err := json.Marshal(cacheData)
+	if err != nil {
+		return
+	}
+
+	cachePath := filepath.Join(s.cacheDir, cacheFileName)
+	os.WriteFile(cachePath, data, 0644)
+}
+
+// FetchRegistry fetches the extension registry from GitHub
+func (s *ExtensionStore) FetchRegistry(forceRefresh bool) (*StoreRegistry, error) {
+	s.cacheMu.Lock()
+	defer s.cacheMu.Unlock()
+
+	// Return cached if valid and not forcing refresh
+	if !forceRefresh && s.cache != nil && time.Since(s.cacheTime) < s.cacheTTL {
+		LogDebug("ExtensionStore", "Using cached registry (%d extensions)", len(s.cache.Extensions))
+		return s.cache, nil
+	}
+
+	LogInfo("ExtensionStore", "Fetching registry from %s", s.registryURL)
+
+	client := &http.Client{Timeout: 30 * time.Second}
+	resp, err := client.Get(s.registryURL)
+	if err != nil {
+		// Return cached data if available on network error
+		if s.cache != nil {
+			LogWarn("ExtensionStore", "Network error, using cached registry: %v", err)
+			return s.cache, nil
+		}
+		return nil, fmt.Errorf("failed to fetch registry: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		if s.cache != nil {
+			LogWarn("ExtensionStore", "HTTP %d, using cached registry", resp.StatusCode)
+			return s.cache, nil
+		}
+		return nil, fmt.Errorf("registry returned HTTP %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read registry: %w", err)
+	}
+
+	var registry StoreRegistry
+	if err := json.Unmarshal(body, &registry); err != nil {
+		return nil, fmt.Errorf("failed to parse registry: %w", err)
+	}
+
+	s.cache = &registry
+	s.cacheTime = time.Now()
+	s.saveDiskCache()
+
+	LogInfo("ExtensionStore", "Fetched %d extensions from registry", len(registry.Extensions))
+	return &registry, nil
+}
+
+// GetExtensionsWithStatus returns extensions with installation status
+func (s *ExtensionStore) GetExtensionsWithStatus() ([]StoreExtensionResponse, error) {
+	registry, err := s.FetchRegistry(false)
+	if err != nil {
+		return nil, err
+	}
+
+	manager := GetExtensionManager()
+	installed := make(map[string]string) // id -> version
+
+	if manager != nil {
+		for _, ext := range manager.GetAllExtensions() {
+			installed[ext.ID] = ext.Manifest.Version
+		}
+	}
+
+	result := make([]StoreExtensionResponse, len(registry.Extensions))
+	for i, ext := range registry.Extensions {
+		resp := ext.ToResponse()
+
+		if installedVersion, ok := installed[ext.ID]; ok {
+			resp.IsInstalled = true
+			resp.InstalledVersion = installedVersion
+			resp.HasUpdate = compareVersions(ext.Version, installedVersion) > 0
+		}
+
+		result[i] = resp
+	}
+
+	return result, nil
+}
+
+// DownloadExtension downloads an extension package to the specified path
+func (s *ExtensionStore) DownloadExtension(extensionID string, destPath string) error {
+	registry, err := s.FetchRegistry(false)
+	if err != nil {
+		return err
+	}
+
+	var ext *StoreExtension
+	for _, e := range registry.Extensions {
+		if e.ID == extensionID {
+			ext = &e
+			break
+		}
+	}
+
+	if ext == nil {
+		return fmt.Errorf("extension %s not found in store", extensionID)
+	}
+
+	LogInfo("ExtensionStore", "Downloading %s from %s", ext.getDisplayName(), ext.getDownloadURL())
+
+	client := &http.Client{Timeout: 5 * time.Minute}
+	resp, err := client.Get(ext.getDownloadURL())
+	if err != nil {
+		return fmt.Errorf("failed to download: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("download returned HTTP %d", resp.StatusCode)
+	}
+
+	// Create destination file
+	out, err := os.Create(destPath)
+	if err != nil {
+		return fmt.Errorf("failed to create file: %w", err)
+	}
+	defer out.Close()
+
+	_, err = io.Copy(out, resp.Body)
+	if err != nil {
+		os.Remove(destPath)
+		return fmt.Errorf("failed to write file: %w", err)
+	}
+
+	LogInfo("ExtensionStore", "Downloaded %s to %s", ext.getDisplayName(), destPath)
+	return nil
+}
+
+// GetCategories returns all available categories
+func (s *ExtensionStore) GetCategories() []string {
+	return []string{
+		CategoryMetadata,
+		CategoryDownload,
+		CategoryUtility,
+		CategoryLyrics,
+		CategoryIntegration,
+	}
+}
+
+// SearchExtensions searches extensions by query
+func (s *ExtensionStore) SearchExtensions(query string, category string) ([]StoreExtensionResponse, error) {
+	extensions, err := s.GetExtensionsWithStatus()
+	if err != nil {
+		return nil, err
+	}
+
+	if query == "" && category == "" {
+		return extensions, nil
+	}
+
+	var result []StoreExtensionResponse
+	queryLower := toLower(query)
+
+	for _, ext := range extensions {
+		// Filter by category
+		if category != "" && ext.Category != category {
+			continue
+		}
+
+		// Filter by query
+		if query != "" {
+			if !containsIgnoreCase(ext.Name, queryLower) &&
+				!containsIgnoreCase(ext.DisplayName, queryLower) &&
+				!containsIgnoreCase(ext.Description, queryLower) &&
+				!containsIgnoreCase(ext.Author, queryLower) {
+				// Check tags
+				found := false
+				for _, tag := range ext.Tags {
+					if containsIgnoreCase(tag, queryLower) {
+						found = true
+						break
+					}
+				}
+				if !found {
+					continue
+				}
+			}
+		}
+
+		result = append(result, ext)
+	}
+
+	return result, nil
+}
+
+// ClearCache clears the in-memory and disk cache
+func (s *ExtensionStore) ClearCache() {
+	s.cacheMu.Lock()
+	defer s.cacheMu.Unlock()
+
+	s.cache = nil
+	s.cacheTime = time.Time{}
+
+	if s.cacheDir != "" {
+		cachePath := filepath.Join(s.cacheDir, cacheFileName)
+		os.Remove(cachePath)
+	}
+
+	LogInfo("ExtensionStore", "Cache cleared")
+}
+
+// Helper: case-insensitive contains
+func containsIgnoreCase(s, substr string) bool {
+	return containsStr(toLower(s), substr)
+}
+
+func toLower(s string) string {
+	result := make([]byte, len(s))
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		if c >= 'A' && c <= 'Z' {
+			c += 'a' - 'A'
+		}
+		result[i] = c
+	}
+	return string(result)
+}
+
+func containsStr(s, substr string) bool {
+	return len(substr) == 0 || (len(s) >= len(substr) && findSubstring(s, substr) >= 0)
+}
+
+func findSubstring(s, substr string) int {
+	for i := 0; i <= len(s)-len(substr); i++ {
+		if s[i:i+len(substr)] == substr {
+			return i
+		}
+	}
+	return -1
+}
@@ -0,0 +1,329 @@
+package gobackend
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/dop251/goja"
+)
+
+func TestParseManifest_Valid(t *testing.T) {
+	validManifest := `{
+		"name": "test-provider",
+		"displayName": "Test Provider",
+		"version": "1.0.0",
+		"author": "Test Author",
+		"description": "A test extension",
+		"type": ["metadata_provider"],
+		"permissions": {
+			"network": ["api.test.com"],
+			"storage": true
+		}
+	}`
+
+	manifest, err := ParseManifest([]byte(validManifest))
+	if err != nil {
+		t.Fatalf("Expected valid manifest to parse, got error: %v", err)
+	}
+
+	if manifest.Name != "test-provider" {
+		t.Errorf("Expected name 'test-provider', got '%s'", manifest.Name)
+	}
+
+	if manifest.Version != "1.0.0" {
+		t.Errorf("Expected version '1.0.0', got '%s'", manifest.Version)
+	}
+
+	if !manifest.IsMetadataProvider() {
+		t.Error("Expected IsMetadataProvider() to return true")
+	}
+
+	if manifest.IsDownloadProvider() {
+		t.Error("Expected IsDownloadProvider() to return false")
+	}
+}
+
+func TestParseManifest_MissingName(t *testing.T) {
+	invalidManifest := `{
+		"version": "1.0.0",
+		"author": "Test Author",
+		"description": "A test extension",
+		"type": ["metadata_provider"]
+	}`
+
+	_, err := ParseManifest([]byte(invalidManifest))
+	if err == nil {
+		t.Fatal("Expected error for missing name")
+	}
+}
+
+func TestParseManifest_MissingType(t *testing.T) {
+	invalidManifest := `{
+		"name": "test-provider",
+		"version": "1.0.0",
+		"author": "Test Author",
+		"description": "A test extension"
+	}`
+
+	_, err := ParseManifest([]byte(invalidManifest))
+	if err == nil {
+		t.Fatal("Expected error for missing type")
+	}
+}
+
+func TestIsDomainAllowed(t *testing.T) {
+	manifest := &ExtensionManifest{
+		Permissions: ExtensionPermissions{
+			Network: []string{"api.test.com", "*.example.com"},
+		},
+	}
+
+	tests := []struct {
+		domain   string
+		expected bool
+	}{
+		{"api.test.com", true},
+		{"api.example.com", true},
+		{"sub.example.com", true},
+		{"notallowed.com", false},
+		{"test.com", false},
+	}
+
+	for _, tt := range tests {
+		result := manifest.IsDomainAllowed(tt.domain)
+		if result != tt.expected {
+			t.Errorf("IsDomainAllowed(%s) = %v, expected %v", tt.domain, result, tt.expected)
+		}
+	}
+}
+
+func TestExtensionRuntime_NetworkSandbox(t *testing.T) {
+	// Create a mock extension with limited network permissions
+	ext := &LoadedExtension{
+		ID: "test-ext",
+		Manifest: &ExtensionManifest{
+			Name: "test-ext",
+			Permissions: ExtensionPermissions{
+				Network: []string{"api.allowed.com", "*.wildcard.com"},
+			},
+		},
+		DataDir: t.TempDir(),
+	}
+
+	runtime := NewExtensionRuntime(ext)
+
+	// Test allowed domains
+	if err := runtime.validateDomain("https://api.allowed.com/path"); err != nil {
+		t.Errorf("Expected api.allowed.com to be allowed, got error: %v", err)
+	}
+
+	if err := runtime.validateDomain("https://sub.wildcard.com/path"); err != nil {
+		t.Errorf("Expected sub.wildcard.com to be allowed (wildcard), got error: %v", err)
+	}
+
+	// Test blocked domains
+	if err := runtime.validateDomain("https://blocked.com/path"); err == nil {
+		t.Error("Expected blocked.com to be denied")
+	}
+
+	if err := runtime.validateDomain("https://notallowed.com/path"); err == nil {
+		t.Error("Expected notallowed.com to be denied")
+	}
+}
+
+func TestExtensionRuntime_FileSandbox(t *testing.T) {
+	tempDir := t.TempDir()
+
+	ext := &LoadedExtension{
+		ID: "test-ext",
+		Manifest: &ExtensionManifest{
+			Name: "test-ext",
+			Permissions: ExtensionPermissions{
+				File: true, // Enable file permission for test
+			},
+		},
+		DataDir: tempDir,
+	}
+
+	runtime := NewExtensionRuntime(ext)
+
+	// Test valid path within sandbox
+	validPath, err := runtime.validatePath("test.txt")
+	if err != nil {
+		t.Errorf("Expected relative path to be valid, got error: %v", err)
+	}
+	if validPath == "" {
+		t.Error("Expected non-empty path")
+	}
+
+	// Test path traversal attack
+	_, err = runtime.validatePath("../../../etc/passwd")
+	if err == nil {
+		t.Error("Expected path traversal to be blocked")
+	}
+
+	// Test nested path within sandbox (should be allowed)
+	nestedPath, err := runtime.validatePath("subdir/file.txt")
+	if err != nil {
+		t.Errorf("Expected nested path to be valid, got error: %v", err)
+	}
+	if nestedPath == "" {
+		t.Error("Expected non-empty nested path")
+	}
+
+	// Test absolute path should be blocked (security fix)
+	// Use platform-appropriate absolute path
+	var absPath string
+	if filepath.IsAbs("C:\\Windows\\System32") {
+		absPath = "C:\\Windows\\System32\\test.txt" // Windows
+	} else {
+		absPath = "/etc/passwd" // Unix
+	}
+	_, err = runtime.validatePath(absPath)
+	if err == nil {
+		t.Error("Expected absolute path to be blocked")
+	}
+
+	// Test that extension without file permission is blocked
+	extNoFile := &LoadedExtension{
+		ID: "test-ext-no-file",
+		Manifest: &ExtensionManifest{
+			Name: "test-ext-no-file",
+			Permissions: ExtensionPermissions{
+				File: false, // No file permission
+			},
+		},
+		DataDir: tempDir,
+	}
+	runtimeNoFile := NewExtensionRuntime(extNoFile)
+	_, err = runtimeNoFile.validatePath("test.txt")
+	if err == nil {
+		t.Error("Expected file access to be denied without file permission")
+	}
+}
+
+func TestExtensionRuntime_UtilityFunctions(t *testing.T) {
+	ext := &LoadedExtension{
+		ID: "test-ext",
+		Manifest: &ExtensionManifest{
+			Name: "test-ext",
+		},
+		DataDir: t.TempDir(),
+	}
+
+	runtime := NewExtensionRuntime(ext)
+	vm := goja.New()
+	runtime.RegisterAPIs(vm)
+
+	// Test base64 encode/decode
+	result, err := vm.RunString(`utils.base64Encode("hello")`)
+	if err != nil {
+		t.Fatalf("base64Encode failed: %v", err)
+	}
+	if result.String() != "aGVsbG8=" {
+		t.Errorf("Expected 'aGVsbG8=', got '%s'", result.String())
+	}
+
+	result, err = vm.RunString(`utils.base64Decode("aGVsbG8=")`)
+	if err != nil {
+		t.Fatalf("base64Decode failed: %v", err)
+	}
+	if result.String() != "hello" {
+		t.Errorf("Expected 'hello', got '%s'", result.String())
+	}
+
+	// Test MD5
+	result, err = vm.RunString(`utils.md5("hello")`)
+	if err != nil {
+		t.Fatalf("md5 failed: %v", err)
+	}
+	if result.String() != "5d41402abc4b2a76b9719d911017c592" {
+		t.Errorf("Expected '5d41402abc4b2a76b9719d911017c592', got '%s'", result.String())
+	}
+
+	// Test JSON parse/stringify
+	result, err = vm.RunString(`utils.stringifyJSON({name: "test", value: 123})`)
+	if err != nil {
+		t.Fatalf("stringifyJSON failed: %v", err)
+	}
+	// JSON output may vary in order, just check it's valid
+	if result.String() == "" {
+		t.Error("Expected non-empty JSON string")
+	}
+}
+
+func TestExtensionRuntime_SSRFProtection(t *testing.T) {
+	// Create extension with limited network permissions
+	ext := &LoadedExtension{
+		ID: "test-ext",
+		Manifest: &ExtensionManifest{
+			Name: "test-ext",
+			Permissions: ExtensionPermissions{
+				Network: []string{"api.example.com"},
+			},
+		},
+		DataDir: t.TempDir(),
+	}
+
+	runtime := NewExtensionRuntime(ext)
+
+	// Test that private IPs are blocked (SSRF protection)
+	privateIPs := []string{
+		"http://localhost/admin",
+		"http://127.0.0.1/admin",
+		"http://192.168.1.1/admin",
+		"http://10.0.0.1/admin",
+		"http://172.16.0.1/admin",
+		"http://169.254.169.254/latest/meta-data/", // AWS metadata
+		"http://router.local/admin",
+	}
+
+	for _, url := range privateIPs {
+		err := runtime.validateDomain(url)
+		if err == nil {
+			t.Errorf("Expected private IP/host '%s' to be blocked", url)
+		}
+	}
+
+	// Test that allowed public domain still works
+	if err := runtime.validateDomain("https://api.example.com/path"); err != nil {
+		t.Errorf("Expected api.example.com to be allowed, got error: %v", err)
+	}
+}
+
+func TestIsPrivateIP(t *testing.T) {
+	tests := []struct {
+		host     string
+		expected bool
+	}{
+		// Private IPs should be blocked
+		{"localhost", true},
+		{"127.0.0.1", true},
+		{"127.0.0.2", true},
+		{"10.0.0.1", true},
+		{"10.255.255.255", true},
+		{"172.16.0.1", true},
+		{"172.31.255.255", true},
+		{"192.168.0.1", true},
+		{"192.168.255.255", true},
+		{"169.254.169.254", true}, // AWS metadata
+		{"router.local", true},
+		{"mydevice.local", true},
+
+		// Public IPs should be allowed
+		{"8.8.8.8", false},
+		{"1.1.1.1", false},
+		{"api.example.com", false},
+		{"google.com", false},
+		{"172.15.0.1", false},  // Just outside 172.16-31 range
+		{"172.32.0.1", false},  // Just outside 172.16-31 range
+		{"192.167.0.1", false}, // Not 192.168.x.x
+	}
+
+	for _, tt := range tests {
+		result := isPrivateIP(tt.host)
+		if result != tt.expected {
+			t.Errorf("isPrivateIP(%s) = %v, expected %v", tt.host, result, tt.expected)
+		}
+	}
+}
@@ -0,0 +1,118 @@
+// Package gobackend provides timeout execution for extension JS code
+package gobackend
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/dop251/goja"
+)
+
+// JSExecutionError represents an error during JS execution
+type JSExecutionError struct {
+	Message   string
+	IsTimeout bool
+}
+
+func (e *JSExecutionError) Error() string {
+	return e.Message
+}
+
+// RunWithTimeout executes JavaScript code with a timeout
+// Returns the result value and any error (including timeout)
+func RunWithTimeout(vm *goja.Runtime, script string, timeout time.Duration) (goja.Value, error) {
+	if timeout <= 0 {
+		timeout = DefaultJSTimeout
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+
+	// Channel to receive result
+	type result struct {
+		value goja.Value
+		err   error
+	}
+	resultCh := make(chan result, 1)
+
+	// Track if we've interrupted
+	var interrupted bool
+	var interruptMu sync.Mutex
+
+	// Run script in goroutine
+	go func() {
+		defer func() {
+			if r := recover(); r != nil {
+				// Check if this was our interrupt
+				interruptMu.Lock()
+				wasInterrupted := interrupted
+				interruptMu.Unlock()
+
+				if wasInterrupted {
+					resultCh <- result{nil, &JSExecutionError{
+						Message:   "execution timeout exceeded",
+						IsTimeout: true,
+					}}
+				} else {
+					resultCh <- result{nil, fmt.Errorf("panic during execution: %v", r)}
+				}
+			}
+		}()
+
+		val, err := vm.RunString(script)
+		resultCh <- result{val, err}
+	}()
+
+	// Wait for result or timeout
+	select {
+	case res := <-resultCh:
+		return res.value, res.err
+	case <-ctx.Done():
+		// Timeout - interrupt the VM
+		interruptMu.Lock()
+		interrupted = true
+		interruptMu.Unlock()
+
+		vm.Interrupt("execution timeout")
+
+		// Wait a bit for the goroutine to finish
+		select {
+		case res := <-resultCh:
+			// If we got a result after interrupt, it might be the timeout error
+			if res.err != nil {
+				return nil, res.err
+			}
+			return nil, &JSExecutionError{
+				Message:   "execution timeout exceeded",
+				IsTimeout: true,
+			}
+		case <-time.After(1 * time.Second):
+			// Force return timeout error
+			return nil, &JSExecutionError{
+				Message:   "execution timeout exceeded (force)",
+				IsTimeout: true,
+			}
+		}
+	}
+}
+
+// RunWithTimeoutAndRecover runs JS with timeout and clears interrupt state after
+// This should be used when you want to continue using the VM after a timeout
+func RunWithTimeoutAndRecover(vm *goja.Runtime, script string, timeout time.Duration) (goja.Value, error) {
+	result, err := RunWithTimeout(vm, script, timeout)
+
+	// Clear any interrupt state so VM can be reused
+	vm.ClearInterrupt()
+
+	return result, err
+}
+
+// IsTimeoutError checks if an error is a timeout error
+func IsTimeoutError(err error) bool {
+	if jsErr, ok := err.(*JSExecutionError); ok {
+		return jsErr.IsTimeout
+	}
+	return false
+}
@@ -5,14 +5,19 @@ go 1.24.0
 toolchain go1.24.5

 require (
+	github.com/dop251/goja v0.0.0-20260106131823-651366fbe6e3
 	github.com/go-flac/flacpicture v0.3.0
 	github.com/go-flac/flacvorbis v0.2.0
 	github.com/go-flac/go-flac v1.0.0
 )

 require (
+	github.com/dlclark/regexp2 v1.11.4 // indirect
+	github.com/go-sourcemap/sourcemap v2.1.3+incompatible // indirect
+	github.com/google/pprof v0.0.0-20230207041349-798e818bf904 // indirect
 	golang.org/x/mobile v0.0.0-20251209145715-2553ed8ce294 // indirect
 	golang.org/x/mod v0.31.0 // indirect
 	golang.org/x/sync v0.19.0 // indirect
+	golang.org/x/text v0.3.8 // indirect
 	golang.org/x/tools v0.40.0 // indirect
 )
@@ -1,14 +1,28 @@
+github.com/Masterminds/semver/v3 v3.2.1 h1:RN9w6+7QoMeJVGyfmbcgs28Br8cvmnucEXnY0rYXWg0=
+github.com/Masterminds/semver/v3 v3.2.1/go.mod h1:qvl/7zhW3nngYb5+80sSMF+FG2BjYrf8m9wsX0PNOMQ=
+github.com/dlclark/regexp2 v1.11.4 h1:rPYF9/LECdNymJufQKmri9gV604RvvABwgOA8un7yAo=
+github.com/dlclark/regexp2 v1.11.4/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=
+github.com/dop251/goja v0.0.0-20260106131823-651366fbe6e3 h1:bVp3yUzvSAJzu9GqID+Z96P+eu5TKnIMJSV4QaZMauM=
+github.com/dop251/goja v0.0.0-20260106131823-651366fbe6e3/go.mod h1:MxLav0peU43GgvwVgNbLAj1s/bSGboKkhuULvq/7hx4=
 github.com/go-flac/flacpicture v0.3.0 h1:LkmTxzFLIynwfhHiZsX0s8xcr3/u33MzvV89u+zOT8I=
 github.com/go-flac/flacpicture v0.3.0/go.mod h1:DPbrzVYQ3fJcvSgLFp9HXIrEQEdfdk/+m0nQCzwodZI=
 github.com/go-flac/flacvorbis v0.2.0 h1:KH0xjpkNTXFER4cszH4zeJxYcrHbUobz/RticWGOESs=
 github.com/go-flac/flacvorbis v0.2.0/go.mod h1:uIysHOtuU7OLGoCRG92bvnkg7QEqHx19qKRV6K1pBrI=
 github.com/go-flac/go-flac v1.0.0 h1:6qI9XOVLcO50xpzm3nXvO31BgDgHhnr/p/rER/K/doY=
 github.com/go-flac/go-flac v1.0.0/go.mod h1:WnZhcpmq4u1UdZMNn9LYSoASpWOCMOoxXxcWEHSzkW8=
+github.com/go-sourcemap/sourcemap v2.1.3+incompatible h1:W1iEw64niKVGogNgBN3ePyLFfuisuzeidWPMPWmECqU=
+github.com/go-sourcemap/sourcemap v2.1.3+incompatible/go.mod h1:F8jJfvm2KbVjc5NqelyYJmf/v5J0dwNLS2mL4sNA1Jg=
+github.com/google/pprof v0.0.0-20230207041349-798e818bf904 h1:4/hN5RUoecvl+RmJRE2YxKWtnnQls6rQjjW5oV7qg2U=
+github.com/google/pprof v0.0.0-20230207041349-798e818bf904/go.mod h1:uglQLonpP8qtYCYyzA+8c/9qtqgA3qsXGYqCPKARAFg=
 golang.org/x/mobile v0.0.0-20251209145715-2553ed8ce294 h1:Cr6kbEvA6nqvdHynE4CtVKlqpZB9dS1Jva/6IsHA19g=
 golang.org/x/mobile v0.0.0-20251209145715-2553ed8ce294/go.mod h1:RdZ+3sb4CVgpCFnzv+I4haEpwqFfsfzlLHs3L7ok+e0=
 golang.org/x/mod v0.31.0 h1:HaW9xtz0+kOcWKwli0ZXy79Ix+UW/vOfmWI5QVd2tgI=
 golang.org/x/mod v0.31.0/go.mod h1:43JraMp9cGx1Rx3AqioxrbrhNsLl2l/iNAvuBkrezpg=
 golang.org/x/sync v0.19.0 h1:vV+1eWNmZ5geRlYjzm2adRgW2/mcpevXNg50YZtPCE4=
 golang.org/x/sync v0.19.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
+golang.org/x/text v0.3.8 h1:nAL+RVCQ9uMn3vJZbV+MRnydTJFPf8qqY42YiA6MrqY=
+golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=
 golang.org/x/tools v0.40.0 h1:yLkxfA+Qnul4cs9QA3KnlFu0lVmd8JJfoq+E41uSutA=
 golang.org/x/tools v0.40.0/go.mod h1:Ik/tzLRlbscWpqqMRjyWYDisX8bG13FrdXp3o4Sr9lc=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
@@ -1,12 +1,17 @@
 package gobackend

 import (
+	"crypto/tls"
+	"errors"
 	"fmt"
 	"io"
 	"math/rand"
 	"net"
 	"net/http"
+	"net/url"
 	"strconv"
+	"strings"
+	"syscall"
 	"time"
 )

@@ -17,12 +22,12 @@ import (
 func getRandomUserAgent() string {
 	// Windows 10/11 Chrome format - same as PC version for maximum compatibility
 	// Some APIs may block mobile User-Agents, so we use desktop format
-	winMajor := rand.Intn(2) + 10  // Windows 10 or 11
-	
-	chromeVersion := rand.Intn(25) + 100 // Chrome 100-124
+	winMajor := rand.Intn(2) + 10 // Windows 10 or 11
+
+	chromeVersion := rand.Intn(25) + 100  // Chrome 100-124
 	chromeBuild := rand.Intn(1500) + 3000 // Build 3000-4500
-	chromePatch := rand.Intn(65) + 60 // Patch 60-125
-	
+	chromePatch := rand.Intn(65) + 60     // Patch 60-125
+
 	return fmt.Sprintf(
 		"Mozilla/5.0 (Windows NT %d.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/%d.0.%d.%d Safari/537.36",
 		winMajor,
@@ -34,46 +39,48 @@ func getRandomUserAgent() string {

 // getRandomMacUserAgent generates a random Mac Chrome User-Agent string
 // Alternative format matching referensi/backend/spotify_metadata.go exactly
-func getRandomMacUserAgent() string {
-	macMajor := rand.Intn(4) + 11  // macOS 11-14
-	macMinor := rand.Intn(5) + 4   // Minor 4-8
-	webkitMajor := rand.Intn(7) + 530
-	webkitMinor := rand.Intn(7) + 30
-	chromeMajor := rand.Intn(25) + 80
-	chromeBuild := rand.Intn(1500) + 3000
-	chromePatch := rand.Intn(65) + 60
-	safariMajor := rand.Intn(7) + 530
-	safariMinor := rand.Intn(6) + 30
-
-	return fmt.Sprintf(
-		"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_%d_%d) AppleWebKit/%d.%d (KHTML, like Gecko) Chrome/%d.0.%d.%d Safari/%d.%d",
-		macMajor,
-		macMinor,
-		webkitMajor,
-		webkitMinor,
-		chromeMajor,
-		chromeBuild,
-		chromePatch,
-		safariMajor,
-		safariMinor,
-	)
-}
+// Kept for potential future use
+// func getRandomMacUserAgent() string {
+// 	macMajor := rand.Intn(4) + 11 // macOS 11-14
+// 	macMinor := rand.Intn(5) + 4  // Minor 4-8
+// 	webkitMajor := rand.Intn(7) + 530
+// 	webkitMinor := rand.Intn(7) + 30
+// 	chromeMajor := rand.Intn(25) + 80
+// 	chromeBuild := rand.Intn(1500) + 3000
+// 	chromePatch := rand.Intn(65) + 60
+// 	safariMajor := rand.Intn(7) + 530
+// 	safariMinor := rand.Intn(6) + 30
+//
+// 	return fmt.Sprintf(
+// 		"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_%d_%d) AppleWebKit/%d.%d (KHTML, like Gecko) Chrome/%d.0.%d.%d Safari/%d.%d",
+// 		macMajor,
+// 		macMinor,
+// 		webkitMajor,
+// 		webkitMinor,
+// 		chromeMajor,
+// 		chromeBuild,
+// 		chromePatch,
+// 		safariMajor,
+// 		safariMinor,
+// 	)
+// }

 // getRandomDesktopUserAgent randomly picks between Windows and Mac User-Agent
-func getRandomDesktopUserAgent() string {
-	if rand.Intn(2) == 0 {
-		return getRandomUserAgent() // Windows
-	}
-	return getRandomMacUserAgent() // Mac
-}
+// Kept for potential future use
+// func getRandomDesktopUserAgent() string {
+// 	if rand.Intn(2) == 0 {
+// 		return getRandomUserAgent() // Windows
+// 	}
+// 	return getRandomMacUserAgent() // Mac
+// }

 // Default timeout values
 const (
-	DefaultTimeout     = 60 * time.Second  // Default HTTP timeout
-	DownloadTimeout    = 120 * time.Second // Timeout for file downloads
-	SongLinkTimeout    = 30 * time.Second  // Timeout for SongLink API
-	DefaultMaxRetries  = 3                 // Default retry count
-	DefaultRetryDelay  = 1 * time.Second   // Initial retry delay
+	DefaultTimeout    = 60 * time.Second  // Default HTTP timeout
+	DownloadTimeout   = 120 * time.Second // Timeout for file downloads
+	SongLinkTimeout   = 30 * time.Second  // Timeout for SongLink API
+	DefaultMaxRetries = 3                 // Default retry count
+	DefaultRetryDelay = 1 * time.Second   // Initial retry delay
 )

 // Shared transport with connection pooling to prevent TCP exhaustion
@@ -91,9 +98,9 @@ var sharedTransport = &http.Transport{
 	ExpectContinueTimeout: 1 * time.Second,
 	DisableKeepAlives:     false, // Enable keep-alives for connection reuse
 	ForceAttemptHTTP2:     true,
-	WriteBufferSize:       64 * 1024,  // 64KB write buffer
-	ReadBufferSize:        64 * 1024,  // 64KB read buffer
-	DisableCompression:    true,       // FLAC is already compressed
+	WriteBufferSize:       64 * 1024, // 64KB write buffer
+	ReadBufferSize:        64 * 1024, // 64KB read buffer
+	DisableCompression:    true,      // FLAC is already compressed
 }

 // Shared HTTP client for general requests (reuses connections)
@@ -134,9 +141,15 @@ func CloseIdleConnections() {
 }

 // DoRequestWithUserAgent executes an HTTP request with a random User-Agent header
+// Also checks for ISP blocking on errors
 func DoRequestWithUserAgent(client *http.Client, req *http.Request) (*http.Response, error) {
 	req.Header.Set("User-Agent", getRandomUserAgent())
-	return client.Do(req)
+	resp, err := client.Do(req)
+	if err != nil {
+		// Check for ISP blocking
+		CheckAndLogISPBlocking(err, req.URL.String(), "HTTP")
+	}
+	return resp, err
 }

 // RetryConfig holds configuration for retry logic
@@ -159,9 +172,11 @@ func DefaultRetryConfig() RetryConfig {

 // DoRequestWithRetry executes an HTTP request with retry logic and exponential backoff
 // Handles 429 (Too Many Requests) responses with Retry-After header
+// Also detects and logs ISP blocking
 func DoRequestWithRetry(client *http.Client, req *http.Request, config RetryConfig) (*http.Response, error) {
 	var lastErr error
 	delay := config.InitialDelay
+	requestURL := req.URL.String()

 	for attempt := 0; attempt <= config.MaxRetries; attempt++ {
 		// Clone request for retry (body needs to be re-readable)
@@ -171,7 +186,16 @@ func DoRequestWithRetry(client *http.Client, req *http.Request, config RetryConf
 		resp, err := client.Do(reqCopy)
 		if err != nil {
 			lastErr = err
+
+			// Check for ISP blocking on network errors
+			if CheckAndLogISPBlocking(err, requestURL, "HTTP") {
+				// Don't retry if ISP blocking is detected - it won't help
+				return nil, WrapErrorWithISPCheck(err, requestURL, "HTTP")
+			}
+
 			if attempt < config.MaxRetries {
+				GoLog("[HTTP] Request failed (attempt %d/%d): %v, retrying in %v...\n",
+					attempt+1, config.MaxRetries+1, err, delay)
 				time.Sleep(delay)
 				delay = calculateNextDelay(delay, config)
 			}
@@ -192,17 +216,43 @@ func DoRequestWithRetry(client *http.Client, req *http.Request, config RetryConf
 			}
 			lastErr = fmt.Errorf("rate limited (429)")
 			if attempt < config.MaxRetries {
+				GoLog("[HTTP] Rate limited, waiting %v before retry...\n", delay)
 				time.Sleep(delay)
 				delay = calculateNextDelay(delay, config)
 			}
 			continue
 		}

+		// Check for ISP blocking via HTTP status codes
+		// Some ISPs return 403 or 451 when blocking content
+		if resp.StatusCode == 403 || resp.StatusCode == 451 {
+			body, _ := io.ReadAll(resp.Body)
+			resp.Body.Close()
+			bodyStr := strings.ToLower(string(body))
+
+			// Check if response looks like ISP blocking page
+			ispBlockingIndicators := []string{
+				"blocked", "forbidden", "access denied", "not available in your",
+				"restricted", "censored", "unavailable for legal", "blocked by",
+			}
+
+			for _, indicator := range ispBlockingIndicators {
+				if strings.Contains(bodyStr, indicator) {
+					LogError("HTTP", "ISP BLOCKING DETECTED via HTTP %d response", resp.StatusCode)
+					LogError("HTTP", "Domain: %s", req.URL.Host)
+					LogError("HTTP", "Response contains: %s", indicator)
+					LogError("HTTP", "Suggestion: Try using a VPN or changing your DNS to 1.1.1.1 or 8.8.8.8")
+					return nil, fmt.Errorf("ISP blocking detected for %s (HTTP %d) - try using VPN or change DNS", req.URL.Host, resp.StatusCode)
+				}
+			}
+		}
+
 		// Server errors (5xx) - retry
 		if resp.StatusCode >= 500 {
 			resp.Body.Close()
 			lastErr = fmt.Errorf("server error: HTTP %d", resp.StatusCode)
 			if attempt < config.MaxRetries {
+				GoLog("[HTTP] Server error %d, retrying in %v...\n", resp.StatusCode, delay)
 				time.Sleep(delay)
 				delay = calculateNextDelay(delay, config)
 			}
@@ -219,10 +269,7 @@ func DoRequestWithRetry(client *http.Client, req *http.Request, config RetryConf
 // calculateNextDelay calculates the next delay with exponential backoff
 func calculateNextDelay(currentDelay time.Duration, config RetryConfig) time.Duration {
 	nextDelay := time.Duration(float64(currentDelay) * config.BackoffFactor)
-	if nextDelay > config.MaxDelay {
-		nextDelay = config.MaxDelay
-	}
-	return nextDelay
+	return min(nextDelay, config.MaxDelay)
 }

 // getRetryAfterDuration parses Retry-After header and returns duration
@@ -296,3 +343,172 @@ func BuildErrorMessage(apiURL string, statusCode int, responsePreview string) st
 	}
 	return msg
 }
+
+// ISPBlockingError represents an error caused by ISP blocking
+type ISPBlockingError struct {
+	Domain      string
+	Reason      string
+	OriginalErr error
+}
+
+func (e *ISPBlockingError) Error() string {
+	return fmt.Sprintf("ISP blocking detected for %s: %s", e.Domain, e.Reason)
+}
+
+// IsISPBlocking checks if an error is likely caused by ISP blocking
+// Returns the ISPBlockingError if detected, nil otherwise
+func IsISPBlocking(err error, requestURL string) *ISPBlockingError {
+	if err == nil {
+		return nil
+	}
+
+	// Extract domain from URL
+	domain := extractDomain(requestURL)
+	errStr := strings.ToLower(err.Error())
+
+	// Check for DNS resolution failure (common ISP blocking method)
+	var dnsErr *net.DNSError
+	if errors.As(err, &dnsErr) {
+		if dnsErr.IsNotFound || dnsErr.IsTemporary {
+			return &ISPBlockingError{
+				Domain:      domain,
+				Reason:      "DNS resolution failed - domain may be blocked by ISP",
+				OriginalErr: err,
+			}
+		}
+	}
+
+	// Check for connection refused (ISP firewall blocking)
+	var opErr *net.OpError
+	if errors.As(err, &opErr) {
+		if opErr.Op == "dial" {
+			// Check for specific syscall errors
+			var syscallErr syscall.Errno
+			if errors.As(opErr.Err, &syscallErr) {
+				switch syscallErr {
+				case syscall.ECONNREFUSED:
+					return &ISPBlockingError{
+						Domain:      domain,
+						Reason:      "Connection refused - port may be blocked by ISP/firewall",
+						OriginalErr: err,
+					}
+				case syscall.ECONNRESET:
+					return &ISPBlockingError{
+						Domain:      domain,
+						Reason:      "Connection reset - ISP may be intercepting traffic",
+						OriginalErr: err,
+					}
+				case syscall.ETIMEDOUT:
+					return &ISPBlockingError{
+						Domain:      domain,
+						Reason:      "Connection timed out - ISP may be blocking access",
+						OriginalErr: err,
+					}
+				case syscall.ENETUNREACH:
+					return &ISPBlockingError{
+						Domain:      domain,
+						Reason:      "Network unreachable - ISP may be blocking route",
+						OriginalErr: err,
+					}
+				case syscall.EHOSTUNREACH:
+					return &ISPBlockingError{
+						Domain:      domain,
+						Reason:      "Host unreachable - ISP may be blocking destination",
+						OriginalErr: err,
+					}
+				}
+			}
+		}
+	}
+
+	// Check for TLS handshake failure (ISP MITM or blocking HTTPS)
+	var tlsErr *tls.RecordHeaderError
+	if errors.As(err, &tlsErr) {
+		return &ISPBlockingError{
+			Domain:      domain,
+			Reason:      "TLS handshake failed - ISP may be intercepting HTTPS traffic",
+			OriginalErr: err,
+		}
+	}
+
+	// Check error message patterns for common ISP blocking indicators
+	blockingPatterns := []struct {
+		pattern string
+		reason  string
+	}{
+		{"connection reset by peer", "Connection reset - ISP may be intercepting traffic"},
+		{"connection refused", "Connection refused - port may be blocked"},
+		{"no such host", "DNS lookup failed - domain may be blocked by ISP"},
+		{"i/o timeout", "Connection timed out - ISP may be blocking access"},
+		{"network is unreachable", "Network unreachable - ISP may be blocking route"},
+		{"tls: ", "TLS error - ISP may be intercepting HTTPS traffic"},
+		{"certificate", "Certificate error - ISP may be using MITM proxy"},
+		{"eof", "Connection closed unexpectedly - ISP may be blocking"},
+		{"context deadline exceeded", "Request timed out - ISP may be throttling"},
+	}
+
+	for _, bp := range blockingPatterns {
+		if strings.Contains(errStr, bp.pattern) {
+			return &ISPBlockingError{
+				Domain:      domain,
+				Reason:      bp.reason,
+				OriginalErr: err,
+			}
+		}
+	}
+
+	return nil
+}
+
+// CheckAndLogISPBlocking checks for ISP blocking and logs if detected
+// Returns true if ISP blocking was detected
+func CheckAndLogISPBlocking(err error, requestURL string, tag string) bool {
+	ispErr := IsISPBlocking(err, requestURL)
+	if ispErr != nil {
+		LogError(tag, "ISP BLOCKING DETECTED: %s", ispErr.Error())
+		LogError(tag, "Domain: %s", ispErr.Domain)
+		LogError(tag, "Reason: %s", ispErr.Reason)
+		LogError(tag, "Original error: %v", ispErr.OriginalErr)
+		LogError(tag, "Suggestion: Try using a VPN or changing your DNS to 1.1.1.1 or 8.8.8.8")
+		return true
+	}
+	return false
+}
+
+// extractDomain extracts the domain from a URL string
+func extractDomain(rawURL string) string {
+	if rawURL == "" {
+		return "unknown"
+	}
+
+	parsed, err := url.Parse(rawURL)
+	if err != nil {
+		// Try to extract domain manually
+		rawURL = strings.TrimPrefix(rawURL, "https://")
+		rawURL = strings.TrimPrefix(rawURL, "http://")
+		if idx := strings.Index(rawURL, "/"); idx > 0 {
+			return rawURL[:idx]
+		}
+		return rawURL
+	}
+
+	if parsed.Host != "" {
+		return parsed.Host
+	}
+	return "unknown"
+}
+
+// WrapErrorWithISPCheck wraps an error with ISP blocking detection
+// If ISP blocking is detected, returns a more descriptive error
+func WrapErrorWithISPCheck(err error, requestURL string, tag string) error {
+	if err == nil {
+		return nil
+	}
+
+	if CheckAndLogISPBlocking(err, requestURL, tag) {
+		domain := extractDomain(requestURL)
+		return fmt.Errorf("ISP blocking detected for %s - try using VPN or change DNS to 1.1.1.1/8.8.8.8: %w", domain, err)
+	}
+
+	return err
+}
@@ -0,0 +1,203 @@
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+	"sync"
+	"time"
+)
+
+// LogEntry represents a single log entry
+type LogEntry struct {
+	Timestamp string `json:"timestamp"`
+	Level     string `json:"level"`
+	Tag       string `json:"tag"`
+	Message   string `json:"message"`
+}
+
+// LogBuffer stores logs in a circular buffer for retrieval by Flutter
+type LogBuffer struct {
+	entries        []LogEntry
+	maxSize        int
+	mu             sync.RWMutex
+	loggingEnabled bool // Whether logging is enabled (controlled by Flutter)
+}
+
+var (
+	globalLogBuffer *LogBuffer
+	logBufferOnce   sync.Once
+)
+
+// GetLogBuffer returns the singleton log buffer instance
+func GetLogBuffer() *LogBuffer {
+	logBufferOnce.Do(func() {
+		globalLogBuffer = &LogBuffer{
+			entries:        make([]LogEntry, 0, 1000),
+			maxSize:        1000,
+			loggingEnabled: false, // Default: disabled for performance (user can enable in settings)
+		}
+	})
+	return globalLogBuffer
+}
+
+// SetLoggingEnabled enables or disables logging
+func (lb *LogBuffer) SetLoggingEnabled(enabled bool) {
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+	lb.loggingEnabled = enabled
+}
+
+// IsLoggingEnabled returns whether logging is enabled
+func (lb *LogBuffer) IsLoggingEnabled() bool {
+	lb.mu.RLock()
+	defer lb.mu.RUnlock()
+	return lb.loggingEnabled
+}
+
+// Add adds a log entry to the buffer
+func (lb *LogBuffer) Add(level, tag, message string) {
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+
+	// Skip if logging is disabled (except for errors which are always logged)
+	if !lb.loggingEnabled && level != "ERROR" && level != "FATAL" {
+		return
+	}
+
+	entry := LogEntry{
+		Timestamp: time.Now().Format("15:04:05.000"),
+		Level:     level,
+		Tag:       tag,
+		Message:   message,
+	}
+
+	if len(lb.entries) >= lb.maxSize {
+		// Remove oldest entry
+		lb.entries = lb.entries[1:]
+	}
+	lb.entries = append(lb.entries, entry)
+
+	// Also print to logcat for debugging
+	fmt.Printf("[%s] %s\n", tag, message)
+}
+
+// GetAll returns all log entries as JSON
+func (lb *LogBuffer) GetAll() string {
+	lb.mu.RLock()
+	defer lb.mu.RUnlock()
+
+	jsonBytes, _ := json.Marshal(lb.entries)
+	return string(jsonBytes)
+}
+
+// getSince returns log entries since the given index (internal use)
+func (lb *LogBuffer) getSince(index int) ([]LogEntry, int) {
+	lb.mu.RLock()
+	defer lb.mu.RUnlock()
+
+	if index < 0 {
+		index = 0
+	}
+	if index >= len(lb.entries) {
+		return []LogEntry{}, len(lb.entries)
+	}
+
+	entries := lb.entries[index:]
+	return entries, len(lb.entries)
+}
+
+// Clear clears all log entries
+func (lb *LogBuffer) Clear() {
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+	lb.entries = lb.entries[:0]
+}
+
+// Count returns the number of log entries
+func (lb *LogBuffer) Count() int {
+	lb.mu.RLock()
+	defer lb.mu.RUnlock()
+	return len(lb.entries)
+}
+
+// Helper functions for logging with different levels
+func LogDebug(tag, format string, args ...interface{}) {
+	GetLogBuffer().Add("DEBUG", tag, fmt.Sprintf(format, args...))
+}
+
+func LogInfo(tag, format string, args ...interface{}) {
+	GetLogBuffer().Add("INFO", tag, fmt.Sprintf(format, args...))
+}
+
+func LogWarn(tag, format string, args ...interface{}) {
+	GetLogBuffer().Add("WARN", tag, fmt.Sprintf(format, args...))
+}
+
+func LogError(tag, format string, args ...interface{}) {
+	GetLogBuffer().Add("ERROR", tag, fmt.Sprintf(format, args...))
+}
+
+// GoLog is a drop-in replacement for fmt.Printf that also logs to buffer
+// It parses the tag from the format string if it starts with [Tag]
+func GoLog(format string, args ...interface{}) {
+	message := fmt.Sprintf(format, args...)
+	message = strings.TrimSuffix(message, "\n")
+
+	// Extract tag from message if present (e.g., "[Tidal] message")
+	tag := "Go"
+	level := "INFO"
+
+	if strings.HasPrefix(message, "[") {
+		endBracket := strings.Index(message, "]")
+		if endBracket > 1 {
+			tag = message[1:endBracket]
+			message = strings.TrimSpace(message[endBracket+1:])
+		}
+	}
+
+	// Determine level from message content
+	msgLower := strings.ToLower(message)
+	if strings.Contains(msgLower, "error") || strings.Contains(msgLower, "failed") || strings.HasPrefix(message, "✗") {
+		level = "ERROR"
+	} else if strings.Contains(msgLower, "warning") || strings.Contains(msgLower, "warn") {
+		level = "WARN"
+	} else if strings.HasPrefix(message, "✓") || strings.Contains(msgLower, "success") || strings.Contains(msgLower, "match found") {
+		level = "INFO"
+	} else if strings.Contains(msgLower, "searching") || strings.Contains(msgLower, "trying") || strings.Contains(msgLower, "found") {
+		level = "DEBUG"
+	}
+
+	GetLogBuffer().Add(level, tag, message)
+}
+
+// Exported functions for Flutter
+
+// GetLogs returns all logs as JSON array
+func GetLogs() string {
+	return GetLogBuffer().GetAll()
+}
+
+// GetLogsSince returns logs since the given index
+// Returns JSON: {"logs": [...], "next_index": N}
+func GetLogsSince(index int) string {
+	entries, nextIndex := GetLogBuffer().getSince(index)
+	logsJson, _ := json.Marshal(entries)
+	result := fmt.Sprintf(`{"logs":%s,"next_index":%d}`, string(logsJson), nextIndex)
+	return result
+}
+
+// ClearLogs clears all logs
+func ClearLogs() {
+	GetLogBuffer().Clear()
+}
+
+// GetLogCount returns the number of log entries
+func GetLogCount() int {
+	return GetLogBuffer().Count()
+}
+
+// SetLoggingEnabled enables or disables logging from Flutter
+func SetLoggingEnabled(enabled bool) {
+	GetLogBuffer().SetLoggingEnabled(enabled)
+}
@@ -250,29 +250,30 @@ func msToLRCTimestamp(ms int64) string {

 // convertToLRC converts lyrics to LRC format string (without metadata headers)
 // Use convertToLRCWithMetadata for full LRC with headers
-func convertToLRC(lyrics *LyricsResponse) string {
-	if lyrics == nil || len(lyrics.Lines) == 0 {
-		return ""
-	}
-
-	var builder strings.Builder
-
-	if lyrics.SyncType == "LINE_SYNCED" {
-		for _, line := range lyrics.Lines {
-			timestamp := msToLRCTimestamp(line.StartTimeMs)
-			builder.WriteString(timestamp)
-			builder.WriteString(line.Words)
-			builder.WriteString("\n")
-		}
-	} else {
-		for _, line := range lyrics.Lines {
-			builder.WriteString(line.Words)
-			builder.WriteString("\n")
-		}
-	}
-
-	return builder.String()
-}
+// Kept for potential future use
+// func convertToLRC(lyrics *LyricsResponse) string {
+// 	if lyrics == nil || len(lyrics.Lines) == 0 {
+// 		return ""
+// 	}
+//
+// 	var builder strings.Builder
+//
+// 	if lyrics.SyncType == "LINE_SYNCED" {
+// 		for _, line := range lyrics.Lines {
+// 			timestamp := msToLRCTimestamp(line.StartTimeMs)
+// 			builder.WriteString(timestamp)
+// 			builder.WriteString(line.Words)
+// 			builder.WriteString("\n")
+// 		}
+// 	} else {
+// 		for _, line := range lyrics.Lines {
+// 			builder.WriteString(line.Words)
+// 			builder.WriteString("\n")
+// 		}
+// 	}
+//
+// 	return builder.String()
+// }

 // convertToLRCWithMetadata converts lyrics to LRC format with metadata headers
 // Includes [ti:], [ar:], [by:] headers
@@ -58,7 +58,7 @@ func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
 	setComment(cmt, "ALBUM", metadata.Album)
 	setComment(cmt, "ALBUMARTIST", metadata.AlbumArtist)
 	setComment(cmt, "DATE", metadata.Date)
-	
+
 	if metadata.TrackNumber > 0 {
 		if metadata.TotalTracks > 0 {
 			setComment(cmt, "TRACKNUMBER", fmt.Sprintf("%d/%d", metadata.TrackNumber, metadata.TotalTracks))
@@ -66,15 +66,15 @@ func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
 			setComment(cmt, "TRACKNUMBER", strconv.Itoa(metadata.TrackNumber))
 		}
 	}
-	
+
 	if metadata.DiscNumber > 0 {
 		setComment(cmt, "DISCNUMBER", strconv.Itoa(metadata.DiscNumber))
 	}
-	
+
 	if metadata.ISRC != "" {
 		setComment(cmt, "ISRC", metadata.ISRC)
 	}
-	
+
 	if metadata.Description != "" {
 		setComment(cmt, "DESCRIPTION", metadata.Description)
 	}
@@ -105,7 +105,7 @@ func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
 						f.Meta = append(f.Meta[:i], f.Meta[i+1:]...)
 					}
 				}
-				
+
 				picture, err := flacpicture.NewFromImageData(
 					flacpicture.PictureTypeFrontCover,
 					"Front Cover",
@@ -162,7 +162,7 @@ func EmbedMetadataWithCoverData(filePath string, metadata Metadata, coverData []
 	setComment(cmt, "ALBUM", metadata.Album)
 	setComment(cmt, "ALBUMARTIST", metadata.AlbumArtist)
 	setComment(cmt, "DATE", metadata.Date)
-	
+
 	if metadata.TrackNumber > 0 {
 		if metadata.TotalTracks > 0 {
 			setComment(cmt, "TRACKNUMBER", fmt.Sprintf("%d/%d", metadata.TrackNumber, metadata.TotalTracks))
@@ -170,15 +170,15 @@ func EmbedMetadataWithCoverData(filePath string, metadata Metadata, coverData []
 			setComment(cmt, "TRACKNUMBER", strconv.Itoa(metadata.TrackNumber))
 		}
 	}
-	
+
 	if metadata.DiscNumber > 0 {
 		setComment(cmt, "DISCNUMBER", strconv.Itoa(metadata.DiscNumber))
 	}
-	
+
 	if metadata.ISRC != "" {
 		setComment(cmt, "ISRC", metadata.ISRC)
 	}
-	
+
 	if metadata.Description != "" {
 		setComment(cmt, "DESCRIPTION", metadata.Description)
 	}
@@ -204,7 +204,7 @@ func EmbedMetadataWithCoverData(filePath string, metadata Metadata, coverData []
 				f.Meta = append(f.Meta[:i], f.Meta[i+1:]...)
 			}
 		}
-		
+
 		picture, err := flacpicture.NewFromImageData(
 			flacpicture.PictureTypeFrontCover,
 			"Front Cover",
@@ -276,7 +276,7 @@ func ReadMetadata(filePath string) (*Metadata, error) {
 					fmt.Sscanf(discNum, "%d", &metadata.DiscNumber)
 				}
 			}
-			
+
 			// Try DATE variants
 			if metadata.Date == "" {
 				metadata.Date = getComment(cmt, "YEAR")
@@ -380,13 +380,13 @@ func ExtractLyrics(filePath string) (string, error) {
 			if err != nil {
 				continue
 			}
-			
+
 			// Try LYRICS tag first
 			lyrics, err := cmt.Get("LYRICS")
 			if err == nil && len(lyrics) > 0 && lyrics[0] != "" {
 				return lyrics[0], nil
 			}
-			
+
 			// Fallback to UNSYNCEDLYRICS
 			lyrics, err = cmt.Get("UNSYNCEDLYRICS")
 			if err == nil && len(lyrics) > 0 && lyrics[0] != "" {
@@ -400,8 +400,9 @@ func ExtractLyrics(filePath string) (string, error) {

 // AudioQuality represents audio quality info from a FLAC file
 type AudioQuality struct {
-	BitDepth   int `json:"bit_depth"`
-	SampleRate int `json:"sample_rate"`
+	BitDepth     int   `json:"bit_depth"`
+	SampleRate   int   `json:"sample_rate"`
+	TotalSamples int64 `json:"total_samples"`
 }

 // GetAudioQuality reads bit depth and sample rate from a FLAC file's StreamInfo block
@@ -419,7 +420,7 @@ func GetAudioQuality(filePath string) (AudioQuality, error) {
 	if _, err := file.Read(marker); err != nil {
 		return AudioQuality{}, fmt.Errorf("failed to read marker: %w", err)
 	}
-	
+
 	// Check if it's a FLAC file
 	if string(marker) == "fLaC" {
 		// Continue reading FLAC metadata
@@ -446,12 +447,20 @@ func GetAudioQuality(filePath string) (AudioQuality, error) {
 		// Parse bits per sample (5 bits)
 		bitsPerSample := ((int(streamInfo[12]) & 0x01) << 4) | (int(streamInfo[13]) >> 4) + 1

+		// Parse total samples (36 bits: 4 bits from byte 13, all of bytes 14-17)
+		totalSamples := int64(streamInfo[13]&0x0F)<<32 |
+			int64(streamInfo[14])<<24 |
+			int64(streamInfo[15])<<16 |
+			int64(streamInfo[16])<<8 |
+			int64(streamInfo[17])
+
 		return AudioQuality{
-			BitDepth:   bitsPerSample,
-			SampleRate: sampleRate,
+			BitDepth:     bitsPerSample,
+			SampleRate:   sampleRate,
+			TotalSamples: totalSamples,
 		}, nil
 	}
-	
+
 	// Check if it's an M4A/MP4 file (starts with size + "ftyp")
 	// First 4 bytes are size, next 4 should be "ftyp"
 	file.Seek(0, 0) // Reset to beginning
@@ -459,17 +468,16 @@ func GetAudioQuality(filePath string) (AudioQuality, error) {
 	if _, err := file.Read(header8); err != nil {
 		return AudioQuality{}, fmt.Errorf("failed to read header: %w", err)
 	}
-	
+
 	if string(header8[4:8]) == "ftyp" {
 		// It's an M4A/MP4 file, use M4A quality reader
 		file.Close() // Close before calling GetM4AQuality which opens the file again
 		return GetM4AQuality(filePath)
 	}
-	
+
 	return AudioQuality{}, fmt.Errorf("unsupported file format (not FLAC or M4A)")
 }

-
 // ========================================
 // M4A (MP4/AAC) Metadata Embedding
 // ========================================
@@ -490,21 +498,21 @@ func EmbedM4AMetadata(filePath string, metadata Metadata, coverData []byte) erro
 	}

 	// Find udta atom inside moov, or create one
-	moovSize := int(data[moovPos]<<24 | data[moovPos+1]<<16 | data[moovPos+2]<<8 | data[moovPos+3])
+	moovSize := int(uint32(data[moovPos])<<24 | uint32(data[moovPos+1])<<16 | uint32(data[moovPos+2])<<8 | uint32(data[moovPos+3]))
 	udtaPos := findAtom(data, "udta", moovPos+8)
-	
+
 	// Build new metadata atoms
 	metaAtom := buildMetaAtom(metadata, coverData)
-	
+
 	var newData []byte
 	if udtaPos >= 0 && udtaPos < moovPos+moovSize {
 		// udta exists, find meta inside it or replace
-		udtaSize := int(data[udtaPos]<<24 | data[udtaPos+1]<<16 | data[udtaPos+2]<<8 | data[udtaPos+3])
+		udtaSize := int(uint32(data[udtaPos])<<24 | uint32(data[udtaPos+1])<<16 | uint32(data[udtaPos+2])<<8 | uint32(data[udtaPos+3]))
 		metaPos := findAtom(data, "meta", udtaPos+8)
-		
+
 		if metaPos >= 0 && metaPos < udtaPos+udtaSize {
 			// Replace existing meta atom
-			metaSize := int(data[metaPos]<<24 | data[metaPos+1]<<16 | data[metaPos+2]<<8 | data[metaPos+3])
+			metaSize := int(uint32(data[metaPos])<<24 | uint32(data[metaPos+1])<<16 | uint32(data[metaPos+2])<<8 | uint32(data[metaPos+3]))
 			newData = append(newData, data[:metaPos]...)
 			newData = append(newData, metaAtom...)
 			newData = append(newData, data[metaPos+metaSize:]...)
@@ -519,7 +527,7 @@ func EmbedM4AMetadata(filePath string, metadata Metadata, coverData []byte) erro
 			newUdta[3] = byte(newUdtaSize)
 			newUdta = append(newUdta, []byte("udta")...)
 			newUdta = append(newUdta, newUdtaContent...)
-			
+
 			newData = append(newData, data[:udtaPos]...)
 			newData = append(newData, newUdta...)
 			newData = append(newData, data[udtaPos+udtaSize:]...)
@@ -535,14 +543,14 @@ func EmbedM4AMetadata(filePath string, metadata Metadata, coverData []byte) erro
 		newUdta[3] = byte(udtaSize)
 		newUdta = append(newUdta, []byte("udta")...)
 		newUdta = append(newUdta, udtaContent...)
-		
+
 		// Insert udta at end of moov
 		insertPos := moovPos + moovSize
 		newData = append(newData, data[:insertPos]...)
 		newData = append(newData, newUdta...)
 		newData = append(newData, data[insertPos:]...)
 	}
-	
+
 	// Update moov size
 	newMoovSize := moovSize + len(newData) - len(data)
 	newData[moovPos] = byte(newMoovSize >> 24)
@@ -562,7 +570,7 @@ func EmbedM4AMetadata(filePath string, metadata Metadata, coverData []byte) erro
 // findAtom finds an atom by name starting from offset
 func findAtom(data []byte, name string, offset int) int {
 	for i := offset; i < len(data)-8; {
-		size := int(data[i]<<24 | data[i+1]<<16 | data[i+2]<<8 | data[i+3])
+		size := int(uint32(data[i])<<24 | uint32(data[i+1])<<16 | uint32(data[i+2])<<8 | uint32(data[i+3]))
 		if size < 8 {
 			break
 		}
@@ -579,52 +587,52 @@ func findAtom(data []byte, name string, offset int) int {
 func buildMetaAtom(metadata Metadata, coverData []byte) []byte {
 	// Build ilst content
 	var ilst []byte
-	
+
 	// ©nam - Title
 	if metadata.Title != "" {
 		ilst = append(ilst, buildTextAtom("©nam", metadata.Title)...)
 	}
-	
+
 	// ©ART - Artist
 	if metadata.Artist != "" {
 		ilst = append(ilst, buildTextAtom("©ART", metadata.Artist)...)
 	}
-	
+
 	// ©alb - Album
 	if metadata.Album != "" {
 		ilst = append(ilst, buildTextAtom("©alb", metadata.Album)...)
 	}
-	
+
 	// aART - Album Artist
 	if metadata.AlbumArtist != "" {
 		ilst = append(ilst, buildTextAtom("aART", metadata.AlbumArtist)...)
 	}
-	
+
 	// ©day - Year/Date
 	if metadata.Date != "" {
 		ilst = append(ilst, buildTextAtom("©day", metadata.Date)...)
 	}
-	
+
 	// trkn - Track Number
 	if metadata.TrackNumber > 0 {
 		ilst = append(ilst, buildTrackNumberAtom(metadata.TrackNumber, metadata.TotalTracks)...)
 	}
-	
+
 	// disk - Disc Number
 	if metadata.DiscNumber > 0 {
 		ilst = append(ilst, buildDiscNumberAtom(metadata.DiscNumber, 0)...)
 	}
-	
+
 	// ©lyr - Lyrics
 	if metadata.Lyrics != "" {
 		ilst = append(ilst, buildTextAtom("©lyr", metadata.Lyrics)...)
 	}
-	
+
 	// covr - Cover Art
 	if len(coverData) > 0 {
 		ilst = append(ilst, buildCoverAtom(coverData)...)
 	}
-	
+
 	// Build ilst atom
 	ilstSize := 8 + len(ilst)
 	ilstAtom := make([]byte, 4)
@@ -634,7 +642,7 @@ func buildMetaAtom(metadata Metadata, coverData []byte) []byte {
 	ilstAtom[3] = byte(ilstSize)
 	ilstAtom = append(ilstAtom, []byte("ilst")...)
 	ilstAtom = append(ilstAtom, ilst...)
-	
+
 	// Build hdlr atom (required for meta)
 	hdlr := []byte{
 		0, 0, 0, 33, // size = 33
@@ -647,11 +655,11 @@ func buildMetaAtom(metadata Metadata, coverData []byte) []byte {
 		0, 0, 0, 0, // component flags mask
 		0, // null terminator
 	}
-	
+
 	// Build meta atom
 	metaContent := append([]byte{0, 0, 0, 0}, hdlr...) // version + flags + hdlr
 	metaContent = append(metaContent, ilstAtom...)
-	
+
 	metaSize := 8 + len(metaContent)
 	metaAtom := make([]byte, 4)
 	metaAtom[0] = byte(metaSize >> 24)
@@ -660,14 +668,14 @@ func buildMetaAtom(metadata Metadata, coverData []byte) []byte {
 	metaAtom[3] = byte(metaSize)
 	metaAtom = append(metaAtom, []byte("meta")...)
 	metaAtom = append(metaAtom, metaContent...)
-	
+
 	return metaAtom
 }

 // buildTextAtom builds a text metadata atom (©nam, ©ART, etc.)
 func buildTextAtom(name, value string) []byte {
 	valueBytes := []byte(value)
-	
+
 	// data atom
 	dataSize := 16 + len(valueBytes)
 	dataAtom := make([]byte, 4)
@@ -679,7 +687,7 @@ func buildTextAtom(name, value string) []byte {
 	dataAtom = append(dataAtom, 0, 0, 0, 1) // type = UTF-8
 	dataAtom = append(dataAtom, 0, 0, 0, 0) // locale
 	dataAtom = append(dataAtom, valueBytes...)
-	
+
 	// container atom
 	atomSize := 8 + len(dataAtom)
 	atom := make([]byte, 4)
@@ -689,7 +697,7 @@ func buildTextAtom(name, value string) []byte {
 	atom[3] = byte(atomSize)
 	atom = append(atom, []byte(name)...)
 	atom = append(atom, dataAtom...)
-	
+
 	return atom
 }

@@ -706,7 +714,7 @@ func buildTrackNumberAtom(track, total int) []byte {
 		byte(total >> 8), byte(total), // total tracks
 		0, 0, // padding
 	}
-	
+
 	// trkn atom
 	atomSize := 8 + len(dataAtom)
 	atom := make([]byte, 4)
@@ -716,7 +724,7 @@ func buildTrackNumberAtom(track, total int) []byte {
 	atom[3] = byte(atomSize)
 	atom = append(atom, []byte("trkn")...)
 	atom = append(atom, dataAtom...)
-	
+
 	return atom
 }

@@ -732,7 +740,7 @@ func buildDiscNumberAtom(disc, total int) []byte {
 		byte(disc >> 8), byte(disc), // disc number
 		byte(total >> 8), byte(total), // total discs
 	}
-	
+
 	// disk atom
 	atomSize := 8 + len(dataAtom)
 	atom := make([]byte, 4)
@@ -742,7 +750,7 @@ func buildDiscNumberAtom(disc, total int) []byte {
 	atom[3] = byte(atomSize)
 	atom = append(atom, []byte("disk")...)
 	atom = append(atom, dataAtom...)
-	
+
 	return atom
 }

@@ -753,7 +761,7 @@ func buildCoverAtom(coverData []byte) []byte {
 	if len(coverData) > 8 && coverData[0] == 0x89 && coverData[1] == 'P' && coverData[2] == 'N' && coverData[3] == 'G' {
 		imageType = 14 // PNG
 	}
-	
+
 	// data atom
 	dataSize := 16 + len(coverData)
 	dataAtom := make([]byte, 4)
@@ -765,7 +773,7 @@ func buildCoverAtom(coverData []byte) []byte {
 	dataAtom = append(dataAtom, 0, 0, 0, imageType) // type = JPEG or PNG
 	dataAtom = append(dataAtom, 0, 0, 0, 0)         // locale
 	dataAtom = append(dataAtom, coverData...)
-	
+
 	// covr atom
 	atomSize := 8 + len(dataAtom)
 	atom := make([]byte, 4)
@@ -775,7 +783,7 @@ func buildCoverAtom(coverData []byte) []byte {
 	atom[3] = byte(atomSize)
 	atom = append(atom, []byte("covr")...)
 	atom = append(atom, dataAtom...)
-	
+
 	return atom
 }

@@ -233,7 +233,7 @@ func PreWarmTrackCache(requests []PreWarmCacheRequest) {
 	fmt.Printf("[Cache] Pre-warm complete. Cache size: %d\n", cache.Size())
 }

-func preWarmTidalCache(isrc, trackName, artistName string) {
+func preWarmTidalCache(isrc, _, _ string) {
 	downloader := NewTidalDownloader()
 	track, err := downloader.SearchTrackByISRC(isrc)
 	if err == nil && track != nil {
@@ -272,7 +272,7 @@ func PreWarmCache(tracksJSON string) error {
 	var requests []PreWarmCacheRequest
 	// Parse JSON (simplified - in production use proper JSON parsing)
 	// For now, this is called from exports.go with proper parsing
-	
+
 	go PreWarmTrackCache(requests) // Run in background
 	return nil
 }
@@ -23,7 +23,7 @@ type ItemProgress struct {
 	ItemID        string  `json:"item_id"`
 	BytesTotal    int64   `json:"bytes_total"`
 	BytesReceived int64   `json:"bytes_received"`
-	Progress      float64 `json:"progress"` // 0.0 to 1.0
+	Progress      float64 `json:"progress"`   // 0.0 to 1.0
 	SpeedMBps     float64 `json:"speed_mbps"` // Download speed in MB/s
 	IsDownloading bool    `json:"is_downloading"`
 	Status        string  `json:"status"` // "downloading", "finalizing", "completed"
@@ -204,11 +204,12 @@ func setDownloadDir(path string) error {
 }

 // getDownloadDir returns the default download directory
-func getDownloadDir() string {
-	downloadDirMu.RLock()
-	defer downloadDirMu.RUnlock()
-	return downloadDir
-}
+// Kept for potential future use
+// func getDownloadDir() string {
+// 	downloadDirMu.RLock()
+// 	defer downloadDirMu.RUnlock()
+// 	return downloadDir
+// }

 // ItemProgressWriter wraps io.Writer to track download progress for a specific item
 type ItemProgressWriter struct {
@@ -256,7 +257,7 @@ func (pw *ItemProgressWriter) Write(p []byte) (int, error) {
 			bytesInInterval := pw.current - pw.lastBytes
 			speedMBps = float64(bytesInInterval) / (1024 * 1024) / elapsed
 		}
-		
+
 		SetItemBytesReceivedWithSpeed(pw.itemID, pw.current, speedMBps)
 		pw.lastReported = pw.current
 		pw.lastTime = now
@@ -12,6 +12,7 @@ import (
 	"path/filepath"
 	"strings"
 	"sync"
+	"time"
 )

 // QobuzDownloader handles Qobuz downloads
@@ -63,48 +64,288 @@ func qobuzArtistsMatch(expectedArtist, foundArtist string) bool {
 		return true
 	}

-	// Check first artist (before comma or feat)
-	expectedFirst := strings.Split(normExpected, ",")[0]
-	expectedFirst = strings.Split(expectedFirst, " feat")[0]
-	expectedFirst = strings.Split(expectedFirst, " ft.")[0]
-	expectedFirst = strings.TrimSpace(expectedFirst)
+	// Split expected artists by common separators (comma, feat, ft., &, and)
+	// e.g., "RADWIMPS, Toko Miura" or "RADWIMPS feat. Toko Miura"
+	expectedArtists := qobuzSplitArtists(normExpected)
+	foundArtists := qobuzSplitArtists(normFound)

-	foundFirst := strings.Split(normFound, ",")[0]
-	foundFirst = strings.Split(foundFirst, " feat")[0]
-	foundFirst = strings.Split(foundFirst, " ft.")[0]
-	foundFirst = strings.TrimSpace(foundFirst)
-
-	if expectedFirst == foundFirst {
-		return true
+	// Check if ANY expected artist matches ANY found artist
+	for _, exp := range expectedArtists {
+		for _, fnd := range foundArtists {
+			if exp == fnd {
+				return true
+			}
+			// Also check contains for partial matches
+			if strings.Contains(exp, fnd) || strings.Contains(fnd, exp) {
+				return true
+			}
+			// Check same words different order
+			if qobuzSameWordsUnordered(exp, fnd) {
+				GoLog("[Qobuz] Artist names have same words in different order: '%s' vs '%s'\n", exp, fnd)
+				return true
+			}
+		}
 	}

-	// Check if first artist is contained in the other
-	if strings.Contains(expectedFirst, foundFirst) || strings.Contains(foundFirst, expectedFirst) {
-		return true
-	}
-
-	// If scripts are different (one is ASCII, one is non-ASCII like Japanese/Chinese/Korean),
-	// assume they're the same artist with different transliteration
-	expectedASCII := qobuzIsASCIIString(expectedArtist)
-	foundASCII := qobuzIsASCIIString(foundArtist)
-	if expectedASCII != foundASCII {
-		fmt.Printf("[Qobuz] Artist names in different scripts, assuming match: '%s' vs '%s'\n", expectedArtist, foundArtist)
+	// If scripts are TRULY different (Latin vs CJK/Arabic/Cyrillic), assume match (transliteration)
+	// Don't treat Latin Extended (Polish, French, etc.) as different script
+	expectedLatin := qobuzIsLatinScript(expectedArtist)
+	foundLatin := qobuzIsLatinScript(foundArtist)
+	if expectedLatin != foundLatin {
+		GoLog("[Qobuz] Artist names in different scripts, assuming match: '%s' vs '%s'\n", expectedArtist, foundArtist)
 		return true
 	}

 	return false
 }

-// qobuzIsASCIIString checks if a string contains only ASCII characters
-func qobuzIsASCIIString(s string) bool {
-	for _, r := range s {
-		if r > 127 {
+// qobuzSplitArtists splits artist string by common separators
+func qobuzSplitArtists(artists string) []string {
+	// Replace common separators with a standard one
+	normalized := artists
+	normalized = strings.ReplaceAll(normalized, " feat. ", "|")
+	normalized = strings.ReplaceAll(normalized, " feat ", "|")
+	normalized = strings.ReplaceAll(normalized, " ft. ", "|")
+	normalized = strings.ReplaceAll(normalized, " ft ", "|")
+	normalized = strings.ReplaceAll(normalized, " & ", "|")
+	normalized = strings.ReplaceAll(normalized, " and ", "|")
+	normalized = strings.ReplaceAll(normalized, ", ", "|")
+	normalized = strings.ReplaceAll(normalized, " x ", "|")
+
+	parts := strings.Split(normalized, "|")
+	result := make([]string, 0, len(parts))
+	for _, p := range parts {
+		trimmed := strings.TrimSpace(p)
+		if trimmed != "" {
+			result = append(result, trimmed)
+		}
+	}
+	return result
+}
+
+// qobuzSameWordsUnordered checks if two strings have the same words regardless of order
+// Useful for Japanese names: "Sawano Hiroyuki" vs "Hiroyuki Sawano"
+func qobuzSameWordsUnordered(a, b string) bool {
+	wordsA := strings.Fields(a)
+	wordsB := strings.Fields(b)
+
+	// Must have same number of words
+	if len(wordsA) != len(wordsB) || len(wordsA) == 0 {
+		return false
+	}
+
+	// Sort and compare
+	sortedA := make([]string, len(wordsA))
+	sortedB := make([]string, len(wordsB))
+	copy(sortedA, wordsA)
+	copy(sortedB, wordsB)
+
+	// Simple bubble sort (usually just 2-3 words)
+	for i := 0; i < len(sortedA)-1; i++ {
+		for j := i + 1; j < len(sortedA); j++ {
+			if sortedA[i] > sortedA[j] {
+				sortedA[i], sortedA[j] = sortedA[j], sortedA[i]
+			}
+			if sortedB[i] > sortedB[j] {
+				sortedB[i], sortedB[j] = sortedB[j], sortedB[i]
+			}
+		}
+	}
+
+	for i := range sortedA {
+		if sortedA[i] != sortedB[i] {
 			return false
 		}
 	}
 	return true
 }

+// qobuzTitlesMatch checks if track titles are similar enough
+func qobuzTitlesMatch(expectedTitle, foundTitle string) bool {
+	normExpected := strings.ToLower(strings.TrimSpace(expectedTitle))
+	normFound := strings.ToLower(strings.TrimSpace(foundTitle))
+
+	// Exact match
+	if normExpected == normFound {
+		return true
+	}
+
+	// Check if one contains the other
+	if strings.Contains(normExpected, normFound) || strings.Contains(normFound, normExpected) {
+		return true
+	}
+
+	// Clean BOTH titles and compare (removes suffixes like remaster, remix, etc)
+	cleanExpected := qobuzCleanTitle(normExpected)
+	cleanFound := qobuzCleanTitle(normFound)
+
+	if cleanExpected == cleanFound {
+		return true
+	}
+
+	// Check if cleaned versions contain each other
+	if cleanExpected != "" && cleanFound != "" {
+		if strings.Contains(cleanExpected, cleanFound) || strings.Contains(cleanFound, cleanExpected) {
+			return true
+		}
+	}
+
+	// Extract core title (before any parentheses/brackets)
+	coreExpected := qobuzExtractCoreTitle(normExpected)
+	coreFound := qobuzExtractCoreTitle(normFound)
+
+	if coreExpected != "" && coreFound != "" && coreExpected == coreFound {
+		return true
+	}
+
+	// If scripts are TRULY different (Latin vs CJK/Arabic/Cyrillic), assume match (transliteration)
+	// Don't treat Latin Extended (Polish, French, etc.) as different script
+	expectedLatin := qobuzIsLatinScript(expectedTitle)
+	foundLatin := qobuzIsLatinScript(foundTitle)
+	if expectedLatin != foundLatin {
+		GoLog("[Qobuz] Titles in different scripts, assuming match: '%s' vs '%s'\n", expectedTitle, foundTitle)
+		return true
+	}
+
+	return false
+}
+
+// qobuzExtractCoreTitle extracts the main title before any parentheses or brackets
+func qobuzExtractCoreTitle(title string) string {
+	// Find first occurrence of ( or [
+	parenIdx := strings.Index(title, "(")
+	bracketIdx := strings.Index(title, "[")
+	dashIdx := strings.Index(title, " - ")
+
+	cutIdx := len(title)
+	if parenIdx > 0 && parenIdx < cutIdx {
+		cutIdx = parenIdx
+	}
+	if bracketIdx > 0 && bracketIdx < cutIdx {
+		cutIdx = bracketIdx
+	}
+	if dashIdx > 0 && dashIdx < cutIdx {
+		cutIdx = dashIdx
+	}
+
+	return strings.TrimSpace(title[:cutIdx])
+}
+
+// qobuzCleanTitle removes common suffixes from track titles for comparison
+func qobuzCleanTitle(title string) string {
+	cleaned := title
+
+	// Remove content in parentheses/brackets that are version indicators
+	// This helps match "Song (Remastered)" with "Song" or "Song (2024 Remaster)"
+	versionPatterns := []string{
+		"remaster", "remastered", "deluxe", "bonus", "single",
+		"album version", "radio edit", "original mix", "extended",
+		"club mix", "remix", "live", "acoustic", "demo",
+	}
+
+	// Remove parenthetical content if it contains version indicators
+	for {
+		startParen := strings.LastIndex(cleaned, "(")
+		endParen := strings.LastIndex(cleaned, ")")
+		if startParen >= 0 && endParen > startParen {
+			content := strings.ToLower(cleaned[startParen+1 : endParen])
+			isVersionIndicator := false
+			for _, pattern := range versionPatterns {
+				if strings.Contains(content, pattern) {
+					isVersionIndicator = true
+					break
+				}
+			}
+			if isVersionIndicator {
+				cleaned = strings.TrimSpace(cleaned[:startParen]) + cleaned[endParen+1:]
+				continue
+			}
+		}
+		break
+	}
+
+	// Same for brackets
+	for {
+		startBracket := strings.LastIndex(cleaned, "[")
+		endBracket := strings.LastIndex(cleaned, "]")
+		if startBracket >= 0 && endBracket > startBracket {
+			content := strings.ToLower(cleaned[startBracket+1 : endBracket])
+			isVersionIndicator := false
+			for _, pattern := range versionPatterns {
+				if strings.Contains(content, pattern) {
+					isVersionIndicator = true
+					break
+				}
+			}
+			if isVersionIndicator {
+				cleaned = strings.TrimSpace(cleaned[:startBracket]) + cleaned[endBracket+1:]
+				continue
+			}
+		}
+		break
+	}
+
+	// Remove trailing " - version" patterns
+	dashPatterns := []string{
+		" - remaster", " - remastered", " - single version", " - radio edit",
+		" - live", " - acoustic", " - demo", " - remix",
+	}
+	for _, pattern := range dashPatterns {
+		if strings.HasSuffix(strings.ToLower(cleaned), pattern) {
+			cleaned = cleaned[:len(cleaned)-len(pattern)]
+		}
+	}
+
+	// Remove multiple spaces
+	for strings.Contains(cleaned, "  ") {
+		cleaned = strings.ReplaceAll(cleaned, "  ", " ")
+	}
+
+	return strings.TrimSpace(cleaned)
+}
+
+// qobuzIsLatinScript checks if a string is primarily Latin script
+// Returns true for ASCII and Latin Extended characters (European languages)
+// Returns false for CJK, Arabic, Cyrillic, etc.
+func qobuzIsLatinScript(s string) bool {
+	for _, r := range s {
+		// Skip common punctuation and numbers
+		if r < 128 {
+			continue
+		}
+		// Latin Extended-A: U+0100 to U+017F (Polish, Czech, etc.)
+		// Latin Extended-B: U+0180 to U+024F
+		// Latin Extended Additional: U+1E00 to U+1EFF
+		// Latin Extended-C/D/E: various ranges
+		if (r >= 0x0100 && r <= 0x024F) || // Latin Extended A & B
+			(r >= 0x1E00 && r <= 0x1EFF) || // Latin Extended Additional
+			(r >= 0x00C0 && r <= 0x00FF) { // Latin-1 Supplement (accented chars)
+			continue
+		}
+		// CJK ranges - definitely different script
+		if (r >= 0x4E00 && r <= 0x9FFF) || // CJK Unified Ideographs
+			(r >= 0x3040 && r <= 0x309F) || // Hiragana
+			(r >= 0x30A0 && r <= 0x30FF) || // Katakana
+			(r >= 0xAC00 && r <= 0xD7AF) || // Hangul (Korean)
+			(r >= 0x0600 && r <= 0x06FF) || // Arabic
+			(r >= 0x0400 && r <= 0x04FF) { // Cyrillic
+			return false
+		}
+	}
+	return true
+}
+
+// qobuzIsASCIIString checks if a string contains only ASCII characters
+// Kept for potential future use
+// func qobuzIsASCIIString(s string) bool {
+// 	for _, r := range s {
+// 		if r > 127 {
+// 			return false
+// 		}
+// 	}
+// 	return true
+// }
+
 // containsQueryQobuz checks if a query already exists in the list
 func containsQueryQobuz(queries []string, query string) bool {
 	for _, q := range queries {
@@ -194,8 +435,8 @@ func (q *QobuzDownloader) SearchTrackByISRC(isrc string) (*QobuzTrack, error) {
 // SearchTrackByISRCWithTitle searches for a track by ISRC with duration verification
 // expectedDurationSec is the expected duration in seconds (0 to skip verification)
 func (q *QobuzDownloader) SearchTrackByISRCWithDuration(isrc string, expectedDurationSec int) (*QobuzTrack, error) {
-	fmt.Printf("[Qobuz] Searching by ISRC: %s\n", isrc)
-	
+	GoLog("[Qobuz] Searching by ISRC: %s\n", isrc)
+
 	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly93d3cucW9idXouY29tL2FwaS5qc29uLzAuMi90cmFjay9zZWFyY2g/cXVlcnk9")
 	searchURL := fmt.Sprintf("%s%s&limit=50&app_id=%s", string(apiBase), url.QueryEscape(isrc), q.appID)

@@ -223,7 +464,7 @@ func (q *QobuzDownloader) SearchTrackByISRCWithDuration(isrc string, expectedDur
 		return nil, err
 	}

-	fmt.Printf("[Qobuz] ISRC search returned %d results\n", len(result.Tracks.Items))
+	GoLog("[Qobuz] ISRC search returned %d results\n", len(result.Tracks.Items))

 	// Find ISRC matches
 	var isrcMatches []*QobuzTrack
@@ -233,7 +474,7 @@ func (q *QobuzDownloader) SearchTrackByISRCWithDuration(isrc string, expectedDur
 		}
 	}

-	fmt.Printf("[Qobuz] Found %d exact ISRC matches\n", len(isrcMatches))
+	GoLog("[Qobuz] Found %d exact ISRC matches\n", len(isrcMatches))

 	if len(isrcMatches) > 0 {
 		// Verify duration if provided
@@ -251,20 +492,20 @@ func (q *QobuzDownloader) SearchTrackByISRCWithDuration(isrc string, expectedDur
 			}

 			if len(durationVerifiedMatches) > 0 {
-				fmt.Printf("[Qobuz] ISRC match with duration verification: '%s' (expected %ds, found %ds)\n",
+				GoLog("[Qobuz] ISRC match with duration verification: '%s' (expected %ds, found %ds)\n",
 					durationVerifiedMatches[0].Title, expectedDurationSec, durationVerifiedMatches[0].Duration)
 				return durationVerifiedMatches[0], nil
 			}

 			// ISRC matches but duration doesn't
-			fmt.Printf("[Qobuz] WARNING: ISRC %s found but duration mismatch. Expected=%ds, Found=%ds. Rejecting.\n",
+			GoLog("[Qobuz] WARNING: ISRC %s found but duration mismatch. Expected=%ds, Found=%ds. Rejecting.\n",
 				isrc, expectedDurationSec, isrcMatches[0].Duration)
 			return nil, fmt.Errorf("ISRC found but duration mismatch: expected %ds, found %ds (likely different version)",
 				expectedDurationSec, isrcMatches[0].Duration)
 		}

 		// No duration to verify, return first match
-		fmt.Printf("[Qobuz] ISRC match (no duration verification): '%s'\n", isrcMatches[0].Title)
+		GoLog("[Qobuz] ISRC match (no duration verification): '%s'\n", isrcMatches[0].Title)
 		return isrcMatches[0], nil
 	}

@@ -287,6 +528,7 @@ func (q *QobuzDownloader) SearchTrackByMetadata(trackName, artistName string) (*

 // SearchTrackByMetadataWithDuration searches for a track with duration verification
 // Now includes romaji conversion for Japanese text (same as Tidal)
+// Also includes title verification to prevent wrong song downloads
 func (q *QobuzDownloader) SearchTrackByMetadataWithDuration(trackName, artistName string, expectedDurationSec int) (*QobuzTrack, error) {
 	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly93d3cucW9idXouY29tL2FwaS5qc29uLzAuMi90cmFjay9zZWFyY2g/cXVlcnk9")

@@ -318,7 +560,7 @@ func (q *QobuzDownloader) SearchTrackByMetadataWithDuration(trackName, artistNam
 			romajiQuery := cleanRomajiArtist + " " + cleanRomajiTrack
 			if !containsQueryQobuz(queries, romajiQuery) {
 				queries = append(queries, romajiQuery)
-				fmt.Printf("[Qobuz] Japanese detected, adding romaji query: %s\n", romajiQuery)
+				GoLog("[Qobuz] Japanese detected, adding romaji query: %s\n", romajiQuery)
 			}
 		}

@@ -348,7 +590,7 @@ func (q *QobuzDownloader) SearchTrackByMetadataWithDuration(trackName, artistNam
 		}
 		searchedQueries[cleanQuery] = true

-		fmt.Printf("[Qobuz] Searching for: %s\n", cleanQuery)
+		GoLog("[Qobuz] Searching for: %s\n", cleanQuery)

 		searchURL := fmt.Sprintf("%s%s&limit=50&app_id=%s", string(apiBase), url.QueryEscape(cleanQuery), q.appID)

@@ -359,7 +601,7 @@ func (q *QobuzDownloader) SearchTrackByMetadataWithDuration(trackName, artistNam

 		resp, err := DoRequestWithUserAgent(q.client, req)
 		if err != nil {
-			fmt.Printf("[Qobuz] Search error for '%s': %v\n", cleanQuery, err)
+			GoLog("[Qobuz] Search error for '%s': %v\n", cleanQuery, err)
 			continue
 		}

@@ -380,7 +622,7 @@ func (q *QobuzDownloader) SearchTrackByMetadataWithDuration(trackName, artistNam
 		resp.Body.Close()

 		if len(result.Tracks.Items) > 0 {
-			fmt.Printf("[Qobuz] Found %d results for '%s'\n", len(result.Tracks.Items), cleanQuery)
+			GoLog("[Qobuz] Found %d results for '%s'\n", len(result.Tracks.Items), cleanQuery)
 			allTracks = append(allTracks, result.Tracks.Items...)
 		}
 	}
@@ -389,11 +631,30 @@ func (q *QobuzDownloader) SearchTrackByMetadataWithDuration(trackName, artistNam
 		return nil, fmt.Errorf("no tracks found for: %s - %s", artistName, trackName)
 	}

+	// Filter by title match first (NEW - like Tidal)
+	var titleMatches []*QobuzTrack
+	for i := range allTracks {
+		track := &allTracks[i]
+		if qobuzTitlesMatch(trackName, track.Title) {
+			titleMatches = append(titleMatches, track)
+		}
+	}
+
+	GoLog("[Qobuz] Title matches: %d out of %d results\n", len(titleMatches), len(allTracks))
+
+	// If no title matches, log warning but continue with all tracks
+	tracksToCheck := titleMatches
+	if len(titleMatches) == 0 {
+		GoLog("[Qobuz] WARNING: No title matches for '%s', checking all %d results\n", trackName, len(allTracks))
+		for i := range allTracks {
+			tracksToCheck = append(tracksToCheck, &allTracks[i])
+		}
+	}
+
 	// If duration verification is requested
 	if expectedDurationSec > 0 {
 		var durationMatches []*QobuzTrack
-		for i := range allTracks {
-			track := &allTracks[i]
+		for _, track := range tracksToCheck {
 			durationDiff := track.Duration - expectedDurationSec
 			if durationDiff < 0 {
 				durationDiff = -durationDiff
@@ -407,105 +668,164 @@ func (q *QobuzDownloader) SearchTrackByMetadataWithDuration(trackName, artistNam
 			// Return best quality among duration matches
 			for _, track := range durationMatches {
 				if track.MaximumBitDepth >= 24 {
+					GoLog("[Qobuz] ✓ Match found: '%s' by '%s' (title+duration verified, hi-res)\n",
+						track.Title, track.Performer.Name)
 					return track, nil
 				}
 			}
+			GoLog("[Qobuz] ✓ Match found: '%s' by '%s' (title+duration verified)\n",
+				durationMatches[0].Title, durationMatches[0].Performer.Name)
 			return durationMatches[0], nil
 		}

 		// No duration match found
-		return nil, fmt.Errorf("no tracks found with matching duration (expected %ds)", expectedDurationSec)
+		return nil, fmt.Errorf("no tracks found with matching title and duration (expected '%s', %ds)", trackName, expectedDurationSec)
 	}

-	// No duration verification, return best quality
-	for i := range allTracks {
-		track := &allTracks[i]
+	// No duration verification, return best quality from title matches
+	for _, track := range tracksToCheck {
 		if track.MaximumBitDepth >= 24 {
+			GoLog("[Qobuz] ✓ Match found: '%s' by '%s' (title verified, hi-res)\n",
+				track.Title, track.Performer.Name)
 			return track, nil
 		}
 	}
-	return &allTracks[0], nil
+
+	if len(tracksToCheck) > 0 {
+		GoLog("[Qobuz] ✓ Match found: '%s' by '%s' (title verified)\n",
+			tracksToCheck[0].Title, tracksToCheck[0].Performer.Name)
+		return tracksToCheck[0], nil
+	}
+
+	return nil, fmt.Errorf("no matching track found for: %s - %s", artistName, trackName)
 }

-// getQobuzDownloadURLSequential requests download URL from APIs sequentially
-// Uses same URL format as PC version: /api/stream?trackId={id}&quality={quality}
-func getQobuzDownloadURLSequential(apis []string, trackID int64, quality string) (string, string, error) {
+// qobuzAPIResult holds the result from a parallel API request
+type qobuzAPIResult struct {
+	apiURL      string
+	downloadURL string
+	err         error
+	duration    time.Duration
+}
+
+// getQobuzDownloadURLParallel requests download URL from all APIs in parallel
+// "Siapa cepat dia dapat" - first successful response wins
+func getQobuzDownloadURLParallel(apis []string, trackID int64, quality string) (string, string, error) {
 	if len(apis) == 0 {
 		return "", "", fmt.Errorf("no APIs available")
 	}

-	client := NewHTTPClientWithTimeout(DefaultTimeout)
-	retryConfig := DefaultRetryConfig()
-	var errors []string
+	GoLog("[Qobuz] Requesting download URL from %d APIs in parallel...\n", len(apis))

+	resultChan := make(chan qobuzAPIResult, len(apis))
+	startTime := time.Now()
+
+	// Start all requests in parallel
 	for _, apiURL := range apis {
-		// All APIs now use same format: https://domain/api/stream?trackId={id}&quality={quality}
-		// The apiURL already includes the path, just append trackID and quality
-		reqURL := fmt.Sprintf("%s%d&quality=%s", apiURL, trackID, quality)
+		go func(api string) {
+			reqStart := time.Now()

-		fmt.Printf("[Qobuz] Trying: %s\n", reqURL)
+			client := &http.Client{
+				Timeout: 15 * time.Second,
+			}

-		req, err := http.NewRequest("GET", reqURL, nil)
-		if err != nil {
-			errors = append(errors, BuildErrorMessage(apiURL, 0, err.Error()))
-			continue
-		}
+			reqURL := fmt.Sprintf("%s%d&quality=%s", api, trackID, quality)

-		resp, err := DoRequestWithRetry(client, req, retryConfig)
-		if err != nil {
-			errors = append(errors, BuildErrorMessage(apiURL, 0, err.Error()))
-			continue
-		}
+			req, err := http.NewRequest("GET", reqURL, nil)
+			if err != nil {
+				resultChan <- qobuzAPIResult{apiURL: api, err: err, duration: time.Since(reqStart)}
+				return
+			}

-		body, err := ReadResponseBody(resp)
-		resp.Body.Close()
-		if err != nil {
-			errors = append(errors, BuildErrorMessage(apiURL, resp.StatusCode, err.Error()))
-			continue
-		}
+			resp, err := client.Do(req)
+			if err != nil {
+				resultChan <- qobuzAPIResult{apiURL: api, err: err, duration: time.Since(reqStart)}
+				return
+			}
+			defer resp.Body.Close()

-		// Check if response is HTML (error page)
-		if len(body) > 0 && body[0] == '<' {
-			errors = append(errors, BuildErrorMessage(apiURL, resp.StatusCode, "received HTML instead of JSON"))
-			continue
-		}
+			if resp.StatusCode != 200 {
+				resultChan <- qobuzAPIResult{apiURL: api, err: fmt.Errorf("HTTP %d", resp.StatusCode), duration: time.Since(reqStart)}
+				return
+			}

-		// Check for error in JSON response
-		var errorResp struct {
-			Error string `json:"error"`
-		}
-		if json.Unmarshal(body, &errorResp) == nil && errorResp.Error != "" {
-			errors = append(errors, BuildErrorMessage(apiURL, resp.StatusCode, errorResp.Error))
-			continue
-		}
+			body, err := io.ReadAll(resp.Body)
+			if err != nil {
+				resultChan <- qobuzAPIResult{apiURL: api, err: err, duration: time.Since(reqStart)}
+				return
+			}

-		var result struct {
-			URL string `json:"url"`
-		}
-		if err := json.Unmarshal(body, &result); err != nil {
-			errors = append(errors, BuildErrorMessage(apiURL, resp.StatusCode, "invalid JSON: "+err.Error()))
-			continue
-		}
+			// Check if response is HTML (error page)
+			if len(body) > 0 && body[0] == '<' {
+				resultChan <- qobuzAPIResult{apiURL: api, err: fmt.Errorf("received HTML instead of JSON"), duration: time.Since(reqStart)}
+				return
+			}

-		if result.URL != "" {
-			fmt.Printf("[Qobuz] Got download URL from: %s\n", apiURL)
-			return apiURL, result.URL, nil
-		}
+			// Check for error in JSON response
+			var errorResp struct {
+				Error string `json:"error"`
+			}
+			if json.Unmarshal(body, &errorResp) == nil && errorResp.Error != "" {
+				resultChan <- qobuzAPIResult{apiURL: api, err: fmt.Errorf("%s", errorResp.Error), duration: time.Since(reqStart)}
+				return
+			}

-		errors = append(errors, BuildErrorMessage(apiURL, resp.StatusCode, "no download URL in response"))
+			var result struct {
+				URL string `json:"url"`
+			}
+			if err := json.Unmarshal(body, &result); err != nil {
+				resultChan <- qobuzAPIResult{apiURL: api, err: fmt.Errorf("invalid JSON: %v", err), duration: time.Since(reqStart)}
+				return
+			}
+
+			if result.URL != "" {
+				resultChan <- qobuzAPIResult{apiURL: api, downloadURL: result.URL, err: nil, duration: time.Since(reqStart)}
+				return
+			}
+
+			resultChan <- qobuzAPIResult{apiURL: api, err: fmt.Errorf("no download URL in response"), duration: time.Since(reqStart)}
+		}(apiURL)
 	}

+	// Collect results - return first success
+	var errors []string
+
+	for i := 0; i < len(apis); i++ {
+		result := <-resultChan
+		if result.err == nil {
+			GoLog("[Qobuz] [Parallel] ✓ Got response from %s in %v\n", result.apiURL, result.duration)
+
+			// Drain remaining results to avoid goroutine leaks
+			go func(remaining int) {
+				for j := 0; j < remaining; j++ {
+					<-resultChan
+				}
+			}(len(apis) - i - 1)
+
+			GoLog("[Qobuz] [Parallel] Total time: %v (first success)\n", time.Since(startTime))
+			return result.apiURL, result.downloadURL, nil
+		}
+		errMsg := result.err.Error()
+		if len(errMsg) > 50 {
+			errMsg = errMsg[:50] + "..."
+		}
+		errors = append(errors, fmt.Sprintf("%s: %s", result.apiURL, errMsg))
+	}
+
+	GoLog("[Qobuz] [Parallel] All %d APIs failed in %v\n", len(apis), time.Since(startTime))
 	return "", "", fmt.Errorf("all %d Qobuz APIs failed. Errors: %v", len(apis), errors)
 }

-// GetDownloadURL gets download URL for a track - tries APIs sequentially
+// GetDownloadURL gets download URL for a track - tries ALL APIs in parallel
+// "Siapa cepat dia dapat" - first successful response wins
 func (q *QobuzDownloader) GetDownloadURL(trackID int64, quality string) (string, error) {
 	apis := q.GetAvailableAPIs()
 	if len(apis) == 0 {
 		return "", fmt.Errorf("no Qobuz API available")
 	}

-	_, downloadURL, err := getQobuzDownloadURLSequential(apis, trackID, quality)
+	// Use parallel approach - request from all APIs simultaneously
+	_, downloadURL, err := getQobuzDownloadURLParallel(apis, trackID, quality)
 	if err != nil {
 		return "", err
 	}
@@ -619,11 +939,11 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 	// OPTIMIZATION: Check cache first for track ID
 	if req.ISRC != "" {
 		if cached := GetTrackIDCache().Get(req.ISRC); cached != nil && cached.QobuzTrackID > 0 {
-			fmt.Printf("[Qobuz] Cache hit! Using cached track ID: %d\n", cached.QobuzTrackID)
+			GoLog("[Qobuz] Cache hit! Using cached track ID: %d\n", cached.QobuzTrackID)
 			// For Qobuz we need to search again to get full track info, but we can use the ID
 			track, err = downloader.SearchTrackByISRC(req.ISRC)
 			if err != nil {
-				fmt.Printf("[Qobuz] Cache hit but search failed: %v\n", err)
+				GoLog("[Qobuz] Cache hit but search failed: %v\n", err)
 				track = nil
 			}
 		}
@@ -631,22 +951,28 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {

 	// Strategy 1: Search by ISRC with duration verification
 	if track == nil && req.ISRC != "" {
-		fmt.Printf("[Qobuz] Trying ISRC search: %s\n", req.ISRC)
+		GoLog("[Qobuz] Trying ISRC search: %s\n", req.ISRC)
 		track, err = downloader.SearchTrackByISRCWithDuration(req.ISRC, expectedDurationSec)
-		// Verify artist
-		if track != nil && !qobuzArtistsMatch(req.ArtistName, track.Performer.Name) {
-			fmt.Printf("[Qobuz] Artist mismatch from ISRC search: expected '%s', got '%s'. Rejecting.\n",
-				req.ArtistName, track.Performer.Name)
-			track = nil
+		// Verify artist AND title
+		if track != nil {
+			if !qobuzArtistsMatch(req.ArtistName, track.Performer.Name) {
+				GoLog("[Qobuz] Artist mismatch from ISRC search: expected '%s', got '%s'. Rejecting.\n",
+					req.ArtistName, track.Performer.Name)
+				track = nil
+			} else if !qobuzTitlesMatch(req.TrackName, track.Title) {
+				GoLog("[Qobuz] Title mismatch from ISRC search: expected '%s', got '%s'. Rejecting.\n",
+					req.TrackName, track.Title)
+				track = nil
+			}
 		}
 	}

-	// Strategy 2: Search by metadata with duration verification
+	// Strategy 2: Search by metadata with duration verification (includes title verification)
 	if track == nil {
 		track, err = downloader.SearchTrackByMetadataWithDuration(req.TrackName, req.ArtistName, expectedDurationSec)
-		// Verify artist
+		// Verify artist (title already verified in SearchTrackByMetadataWithDuration)
 		if track != nil && !qobuzArtistsMatch(req.ArtistName, track.Performer.Name) {
-			fmt.Printf("[Qobuz] Artist mismatch from metadata search: expected '%s', got '%s'. Rejecting.\n",
+			GoLog("[Qobuz] Artist mismatch from metadata search: expected '%s', got '%s'. Rejecting.\n",
 				req.ArtistName, track.Performer.Name)
 			track = nil
 		}
@@ -661,7 +987,7 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 	}

 	// Log match found and cache the track ID
-	fmt.Printf("[Qobuz] Match found: '%s' by '%s' (duration: %ds)\n", track.Title, track.Performer.Name, track.Duration)
+	GoLog("[Qobuz] Match found: '%s' by '%s' (duration: %ds)\n", track.Title, track.Performer.Name, track.Duration)
 	if req.ISRC != "" {
 		GetTrackIDCache().SetQobuz(req.ISRC, track.ID)
 	}
@@ -695,12 +1021,12 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 	case "HI_RES_LOSSLESS":
 		qobuzQuality = "27" // 24-bit 192kHz
 	}
-	fmt.Printf("[Qobuz] Using quality: %s (mapped from %s)\n", qobuzQuality, req.Quality)
+	GoLog("[Qobuz] Using quality: %s (mapped from %s)\n", qobuzQuality, req.Quality)

 	// Get actual quality from track metadata
 	actualBitDepth := track.MaximumBitDepth
 	actualSampleRate := int(track.MaximumSamplingRate * 1000) // Convert kHz to Hz
-	fmt.Printf("[Qobuz] Actual quality: %d-bit/%.1fkHz\n", actualBitDepth, track.MaximumSamplingRate)
+	GoLog("[Qobuz] Actual quality: %d-bit/%.1fkHz\n", actualBitDepth, track.MaximumSamplingRate)

 	// Get download URL using parallel API requests
 	downloadURL, err := downloader.GetDownloadURL(track.ID, qobuzQuality)
@@ -762,7 +1088,7 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 	var coverData []byte
 	if parallelResult != nil && parallelResult.CoverData != nil {
 		coverData = parallelResult.CoverData
-		fmt.Printf("[Qobuz] Using parallel-fetched cover (%d bytes)\n", len(coverData))
+		GoLog("[Qobuz] Using parallel-fetched cover (%d bytes)\n", len(coverData))
 	}

 	if err := EmbedMetadataWithCoverData(outputPath, metadata, coverData); err != nil {
@@ -771,9 +1097,9 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {

 	// Embed lyrics from parallel fetch
 	if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
-		fmt.Printf("[Qobuz] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
+		GoLog("[Qobuz] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
 		if embedErr := EmbedLyrics(outputPath, parallelResult.LyricsLRC); embedErr != nil {
-			fmt.Printf("[Qobuz] Warning: failed to embed lyrics: %v\n", embedErr)
+			GoLog("[Qobuz] Warning: failed to embed lyrics: %v\n", embedErr)
 		} else {
 			fmt.Println("[Qobuz] Lyrics embedded successfully")
 		}
@@ -2,7 +2,6 @@ package gobackend

 import (
 	"context"
-	"encoding/base64"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -17,14 +16,14 @@ import (
 )

 const (
-	spotifyTokenURL     = "https://accounts.spotify.com/api/token"
-	playlistBaseURL     = "https://api.spotify.com/v1/playlists/%s"
-	albumBaseURL        = "https://api.spotify.com/v1/albums/%s"
-	trackBaseURL        = "https://api.spotify.com/v1/tracks/%s"
-	artistBaseURL       = "https://api.spotify.com/v1/artists/%s"
-	artistAlbumsURL     = "https://api.spotify.com/v1/artists/%s/albums"
-	searchBaseURL       = "https://api.spotify.com/v1/search"
-	
+	spotifyTokenURL = "https://accounts.spotify.com/api/token"
+	playlistBaseURL = "https://api.spotify.com/v1/playlists/%s"
+	albumBaseURL    = "https://api.spotify.com/v1/albums/%s"
+	trackBaseURL    = "https://api.spotify.com/v1/tracks/%s"
+	artistBaseURL   = "https://api.spotify.com/v1/artists/%s"
+	artistAlbumsURL = "https://api.spotify.com/v1/artists/%s/albums"
+	searchBaseURL   = "https://api.spotify.com/v1/search"
+
 	// Cache TTL settings
 	artistCacheTTL = 10 * time.Minute
 	searchCacheTTL = 5 * time.Minute
@@ -54,7 +53,7 @@ type SpotifyMetadataClient struct {
 	rng            *rand.Rand
 	rngMu          sync.Mutex
 	userAgent      string
-	
+
 	// Caches to reduce API calls
 	artistCache map[string]*cacheEntry // key: artistID
 	searchCache map[string]*cacheEntry // key: query+type
@@ -69,8 +68,10 @@ var (
 	credentialsMu      sync.RWMutex
 )

+// ErrNoSpotifyCredentials is returned when Spotify credentials are not configured
+var ErrNoSpotifyCredentials = errors.New("Spotify credentials not configured. Please set your own Client ID and Secret in Settings, or use Deezer as metadata source (free, no credentials required)")
+
 // SetSpotifyCredentials sets custom Spotify API credentials
-// Pass empty strings to use default credentials
 func SetSpotifyCredentials(clientID, clientSecret string) {
 	credentialsMu.Lock()
 	defer credentialsMu.Unlock()
@@ -78,39 +79,56 @@ func SetSpotifyCredentials(clientID, clientSecret string) {
 	customClientSecret = clientSecret
 }

-// getCredentials returns the current credentials (custom or default)
-func getCredentials() (string, string) {
+// HasSpotifyCredentials checks if Spotify credentials are configured
+func HasSpotifyCredentials() bool {
 	credentialsMu.RLock()
 	defer credentialsMu.RUnlock()
-	
+
+	// Check custom credentials first
 	if customClientID != "" && customClientSecret != "" {
-		return customClientID, customClientSecret
-	}
-	
-	// Fall back to default credentials
-	clientID := os.Getenv("SPOTIFY_CLIENT_ID")
-	if clientID == "" {
-		if decoded, err := base64.StdEncoding.DecodeString("NWY1NzNjOTYyMDQ5NGJhZTg3ODkwYzBmMDhhNjAyOTM="); err == nil {
-			clientID = string(decoded)
-		}
+		return true
 	}

-	clientSecret := os.Getenv("SPOTIFY_CLIENT_SECRET")
-	if clientSecret == "" {
-		if decoded, err := base64.StdEncoding.DecodeString("MjEyNDc2ZDliMGYzNDcyZWFhNzYyZDkwYjE5YjBiYTg="); err == nil {
-			clientSecret = string(decoded)
-		}
+	// Check environment variables
+	if os.Getenv("SPOTIFY_CLIENT_ID") != "" && os.Getenv("SPOTIFY_CLIENT_SECRET") != "" {
+		return true
 	}
-	
-	return clientID, clientSecret
+
+	return false
+}
+
+// getCredentials returns the current credentials or error if not configured
+func getCredentials() (string, string, error) {
+	credentialsMu.RLock()
+	defer credentialsMu.RUnlock()
+
+	// Check custom credentials first
+	if customClientID != "" && customClientSecret != "" {
+		return customClientID, customClientSecret, nil
+	}
+
+	// Check environment variables
+	clientID := os.Getenv("SPOTIFY_CLIENT_ID")
+	clientSecret := os.Getenv("SPOTIFY_CLIENT_SECRET")
+
+	if clientID != "" && clientSecret != "" {
+		return clientID, clientSecret, nil
+	}
+
+	// No credentials available
+	return "", "", ErrNoSpotifyCredentials
 }

 // NewSpotifyMetadataClient creates a new Spotify client
-func NewSpotifyMetadataClient() *SpotifyMetadataClient {
-	src := rand.NewSource(time.Now().UnixNano())
+// Returns error if credentials are not configured
+func NewSpotifyMetadataClient() (*SpotifyMetadataClient, error) {
+	// Get credentials - will error if not configured
+	clientID, clientSecret, err := getCredentials()
+	if err != nil {
+		return nil, err
+	}

-	// Get credentials (custom or default)
-	clientID, clientSecret := getCredentials()
+	src := rand.NewSource(time.Now().UnixNano())

 	c := &SpotifyMetadataClient{
 		httpClient:   NewHTTPClientWithTimeout(15 * time.Second), // Use shared transport for connection pooling
@@ -122,7 +140,7 @@ func NewSpotifyMetadataClient() *SpotifyMetadataClient {
 		albumCache:   make(map[string]*cacheEntry),
 	}
 	c.userAgent = c.randomUserAgent()
-	return c
+	return c, nil
 }

 // TrackMetadata represents track information
@@ -140,6 +158,7 @@ type TrackMetadata struct {
 	DiscNumber  int    `json:"disc_number,omitempty"`
 	ExternalURL string `json:"external_urls"`
 	ISRC        string `json:"isrc"`
+	AlbumType   string `json:"album_type,omitempty"` // album, single, ep, compilation
 }

 // AlbumTrackMetadata holds per-track info for album/playlist
@@ -159,6 +178,7 @@ type AlbumTrackMetadata struct {
 	ISRC        string `json:"isrc"`
 	AlbumID     string `json:"album_id,omitempty"`
 	AlbumURL    string `json:"album_url,omitempty"`
+	AlbumType   string `json:"album_type,omitempty"` // album, single, ep, compilation
 }

 // AlbumInfoMetadata holds album information
@@ -283,6 +303,7 @@ type albumSimplified struct {
 	Images      []image     `json:"images"`
 	ExternalURL externalURL `json:"external_urls"`
 	Artists     []artist    `json:"artists"`
+	AlbumType   string      `json:"album_type"` // album, single, compilation
 }

 type trackFull struct {
@@ -331,14 +352,14 @@ func (c *SpotifyMetadataClient) SearchTracks(ctx context.Context, query string,
 	}

 	searchURL := fmt.Sprintf("%s?q=%s&type=track&limit=%d", searchBaseURL, url.QueryEscape(query), limit)
-	
+
 	var response struct {
 		Tracks struct {
 			Items []trackFull `json:"items"`
 			Total int         `json:"total"`
 		} `json:"tracks"`
 	}
-	
+
 	if err := c.getJSON(ctx, searchURL, token, &response); err != nil {
 		return nil, err
 	}
@@ -363,6 +384,7 @@ func (c *SpotifyMetadataClient) SearchTracks(ctx context.Context, query string,
 			DiscNumber:  track.DiscNumber,
 			ExternalURL: track.ExternalURL.Spotify,
 			ISRC:        track.ExternalID.ISRC,
+			AlbumType:   track.Album.AlbumType,
 		})
 	}

@@ -373,7 +395,7 @@ func (c *SpotifyMetadataClient) SearchTracks(ctx context.Context, query string,
 func (c *SpotifyMetadataClient) SearchAll(ctx context.Context, query string, trackLimit, artistLimit int) (*SearchAllResult, error) {
 	// Create cache key
 	cacheKey := fmt.Sprintf("all:%s:%d:%d", query, trackLimit, artistLimit)
-	
+
 	// Check cache first
 	c.cacheMu.RLock()
 	if entry, ok := c.searchCache[cacheKey]; ok && !entry.isExpired() {
@@ -388,24 +410,24 @@ func (c *SpotifyMetadataClient) SearchAll(ctx context.Context, query string, tra
 	}

 	searchURL := fmt.Sprintf("%s?q=%s&type=track,artist&limit=%d", searchBaseURL, url.QueryEscape(query), trackLimit)
-	
+
 	var response struct {
 		Tracks struct {
 			Items []trackFull `json:"items"`
 		} `json:"tracks"`
 		Artists struct {
 			Items []struct {
-				ID         string  `json:"id"`
-				Name       string  `json:"name"`
-				Images     []image `json:"images"`
-				Followers  struct {
+				ID        string  `json:"id"`
+				Name      string  `json:"name"`
+				Images    []image `json:"images"`
+				Followers struct {
 					Total int `json:"total"`
 				} `json:"followers"`
 				Popularity int `json:"popularity"`
 			} `json:"items"`
 		} `json:"artists"`
 	}
-	
+
 	if err := c.getJSON(ctx, searchURL, token, &response); err != nil {
 		return nil, err
 	}
@@ -430,6 +452,7 @@ func (c *SpotifyMetadataClient) SearchAll(ctx context.Context, query string, tra
 			DiscNumber:  track.DiscNumber,
 			ExternalURL: track.ExternalURL.Spotify,
 			ISRC:        track.ExternalID.ISRC,
+			AlbumType:   track.Album.AlbumType,
 		})
 	}

@@ -438,7 +461,7 @@ func (c *SpotifyMetadataClient) SearchAll(ctx context.Context, query string, tra
 	if artistCount > artistLimit {
 		artistCount = artistLimit
 	}
-	
+
 	for i := 0; i < artistCount; i++ {
 		artist := response.Artists.Items[i]
 		result.Artists = append(result.Artists, SearchArtistResult{
@@ -534,7 +557,7 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s
 	// Collect all tracks (including paginated)
 	allTrackItems := data.Tracks.Items
 	nextURL := data.Tracks.Next
-	
+
 	// Fetch remaining tracks using pagination (no limit)
 	for nextURL != "" {
 		var pageData struct {
@@ -563,7 +586,7 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s
 	tracks := make([]AlbumTrackMetadata, 0, len(allTrackItems))
 	for _, item := range allTrackItems {
 		isrc := isrcMap[item.ID]
-		
+
 		tracks = append(tracks, AlbumTrackMetadata{
 			SpotifyID:   item.ID,
 			Artists:     joinArtists(item.Artists),
@@ -602,23 +625,23 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s
 // Similar to Deezer implementation for consistency
 func (c *SpotifyMetadataClient) fetchISRCsParallel(ctx context.Context, trackIDs []string, token string) map[string]string {
 	const maxParallelISRC = 10 // Max concurrent ISRC fetches
-	
+
 	result := make(map[string]string)
 	var resultMu sync.Mutex
-	
+
 	if len(trackIDs) == 0 {
 		return result
 	}
-	
+
 	// Use semaphore to limit concurrent requests
 	sem := make(chan struct{}, maxParallelISRC)
 	var wg sync.WaitGroup
-	
+
 	for _, trackID := range trackIDs {
 		wg.Add(1)
 		go func(id string) {
 			defer wg.Done()
-			
+
 			// Acquire semaphore
 			select {
 			case sem <- struct{}{}:
@@ -626,15 +649,15 @@ func (c *SpotifyMetadataClient) fetchISRCsParallel(ctx context.Context, trackIDs
 			case <-ctx.Done():
 				return
 			}
-			
+
 			isrc := c.fetchTrackISRC(ctx, id, token)
-			
+
 			resultMu.Lock()
 			result[id] = isrc
 			resultMu.Unlock()
 		}(trackID)
 	}
-	
+
 	wg.Wait()
 	return result
 }
@@ -668,7 +691,7 @@ func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, t

 	// Pre-allocate with expected capacity
 	tracks := make([]AlbumTrackMetadata, 0, data.Tracks.Total)
-	
+
 	// Add first batch of tracks
 	for _, item := range data.Tracks.Items {
 		if item.Track == nil {
@@ -695,7 +718,7 @@ func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, t

 	// Fetch remaining tracks using pagination (NO LIMIT - fetch all tracks)
 	nextURL := data.Tracks.Next
-	
+
 	for nextURL != "" {
 		var pageData struct {
 			Items []struct {
@@ -755,10 +778,10 @@ func (c *SpotifyMetadataClient) fetchArtist(ctx context.Context, artistID, token

 	// Fetch artist info
 	var artistData struct {
-		ID         string  `json:"id"`
-		Name       string  `json:"name"`
-		Images     []image `json:"images"`
-		Followers  struct {
+		ID        string  `json:"id"`
+		Name      string  `json:"name"`
+		Images    []image `json:"images"`
+		Followers struct {
 			Total int `json:"total"`
 		} `json:"followers"`
 		Popularity int `json:"popularity"`
@@ -941,15 +964,15 @@ func (c *SpotifyMetadataClient) randomUserAgent() string {
 	defer c.rngMu.Unlock()

 	// Use Mac User-Agent format (same as PC version)
-	macMajor := c.rng.Intn(4) + 11    // 11-14
-	macMinor := c.rng.Intn(5) + 4     // 4-8
-	webkitMajor := c.rng.Intn(7) + 530 // 530-536
-	webkitMinor := c.rng.Intn(7) + 30  // 30-36
-	chromeMajor := c.rng.Intn(25) + 80 // 80-104
+	macMajor := c.rng.Intn(4) + 11         // 11-14
+	macMinor := c.rng.Intn(5) + 4          // 4-8
+	webkitMajor := c.rng.Intn(7) + 530     // 530-536
+	webkitMinor := c.rng.Intn(7) + 30      // 30-36
+	chromeMajor := c.rng.Intn(25) + 80     // 80-104
 	chromeBuild := c.rng.Intn(1500) + 3000 // 3000-4499
-	chromePatch := c.rng.Intn(65) + 60 // 60-124
-	safariMajor := c.rng.Intn(7) + 530 // 530-536
-	safariMinor := c.rng.Intn(6) + 30  // 30-35
+	chromePatch := c.rng.Intn(65) + 60     // 60-124
+	safariMajor := c.rng.Intn(7) + 530     // 530-536
+	safariMinor := c.rng.Intn(6) + 30      // 30-35

 	return fmt.Sprintf(
 		"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_%d_%d) AppleWebKit/%d.%d (KHTML, like Gecko) Chrome/%d.0.%d.%d Safari/%d.%d",
@@ -249,6 +249,315 @@ import Gobackend  // Import Go framework
            GobackendClearTrackCache()
            return nil
            
+        case "setSpotifyCredentials":
+            let args = call.arguments as! [String: Any]
+            let clientId = args["client_id"] as! String
+            let clientSecret = args["client_secret"] as! String
+            GobackendSetSpotifyAPICredentials(clientId, clientSecret)
+            return nil
+            
+        case "hasSpotifyCredentials":
+            let hasCredentials = GobackendCheckSpotifyCredentials()
+            return hasCredentials
+            
+        // Log methods
+        case "getLogs":
+            let response = GobackendGetLogs()
+            return response
+            
+        case "getLogsSince":
+            let args = call.arguments as! [String: Any]
+            let index = args["index"] as? Int ?? 0
+            let response = GobackendGetLogsSince(Int(index))
+            return response
+            
+        case "clearLogs":
+            GobackendClearLogs()
+            return nil
+            
+        case "getLogCount":
+            let response = GobackendGetLogCount()
+            return response
+            
+        case "setLoggingEnabled":
+            let args = call.arguments as! [String: Any]
+            let enabled = args["enabled"] as? Bool ?? false
+            GobackendSetLoggingEnabled(enabled)
+            return nil
+            
+        // Extension System methods
+        case "initExtensionSystem":
+            let args = call.arguments as! [String: Any]
+            let extensionsDir = args["extensions_dir"] as! String
+            let dataDir = args["data_dir"] as! String
+            GobackendInitExtensionSystem(extensionsDir, dataDir, &error)
+            if let error = error { throw error }
+            return nil
+            
+        case "loadExtensionsFromDir":
+            let args = call.arguments as! [String: Any]
+            let dirPath = args["dir_path"] as! String
+            let response = GobackendLoadExtensionsFromDir(dirPath, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "loadExtensionFromPath":
+            let args = call.arguments as! [String: Any]
+            let filePath = args["file_path"] as! String
+            let response = GobackendLoadExtensionFromPath(filePath, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "unloadExtension":
+            let args = call.arguments as! [String: Any]
+            let extensionId = args["extension_id"] as! String
+            GobackendUnloadExtensionByID(extensionId, &error)
+            if let error = error { throw error }
+            return nil
+            
+        case "getInstalledExtensions":
+            let response = GobackendGetInstalledExtensions(&error)
+            if let error = error { throw error }
+            return response
+            
+        case "setExtensionEnabled":
+            let args = call.arguments as! [String: Any]
+            let extensionId = args["extension_id"] as! String
+            let enabled = args["enabled"] as? Bool ?? false
+            GobackendSetExtensionEnabledByID(extensionId, enabled, &error)
+            if let error = error { throw error }
+            return nil
+            
+        case "setProviderPriority":
+            let args = call.arguments as! [String: Any]
+            let priorityJson = args["priority"] as! String
+            GobackendSetProviderPriorityJSON(priorityJson, &error)
+            if let error = error { throw error }
+            return nil
+            
+        case "getProviderPriority":
+            let response = GobackendGetProviderPriorityJSON(&error)
+            if let error = error { throw error }
+            return response
+            
+        case "setMetadataProviderPriority":
+            let args = call.arguments as! [String: Any]
+            let priorityJson = args["priority"] as! String
+            GobackendSetMetadataProviderPriorityJSON(priorityJson, &error)
+            if let error = error { throw error }
+            return nil
+            
+        case "getMetadataProviderPriority":
+            let response = GobackendGetMetadataProviderPriorityJSON(&error)
+            if let error = error { throw error }
+            return response
+            
+        case "getExtensionSettings":
+            let args = call.arguments as! [String: Any]
+            let extensionId = args["extension_id"] as! String
+            let response = GobackendGetExtensionSettingsJSON(extensionId, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "setExtensionSettings":
+            let args = call.arguments as! [String: Any]
+            let extensionId = args["extension_id"] as! String
+            let settingsJson = args["settings"] as! String
+            GobackendSetExtensionSettingsJSON(extensionId, settingsJson, &error)
+            if let error = error { throw error }
+            return nil
+            
+        case "searchTracksWithExtensions":
+            let args = call.arguments as! [String: Any]
+            let query = args["query"] as! String
+            let limit = args["limit"] as? Int ?? 20
+            let response = GobackendSearchTracksWithExtensionsJSON(query, Int(limit), &error)
+            if let error = error { throw error }
+            return response
+            
+        case "downloadWithExtensions":
+            let requestJson = call.arguments as! String
+            let response = GobackendDownloadWithExtensionsJSON(requestJson, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "removeExtension":
+            let args = call.arguments as! [String: Any]
+            let extensionId = args["extension_id"] as! String
+            GobackendRemoveExtensionByID(extensionId, &error)
+            if let error = error { throw error }
+            return nil
+            
+        case "upgradeExtension":
+            let args = call.arguments as! [String: Any]
+            let filePath = args["file_path"] as! String
+            let response = GobackendUpgradeExtensionFromPath(filePath, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "checkExtensionUpgrade":
+            let args = call.arguments as! [String: Any]
+            let filePath = args["file_path"] as! String
+            let response = GobackendCheckExtensionUpgradeFromPath(filePath, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "cleanupExtensions":
+            GobackendCleanupExtensions()
+            return nil
+            
+        // Extension Auth API
+        case "getExtensionPendingAuth":
+            let args = call.arguments as! [String: Any]
+            let extensionId = args["extension_id"] as! String
+            let response = GobackendGetExtensionPendingAuthJSON(extensionId, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "setExtensionAuthCode":
+            let args = call.arguments as! [String: Any]
+            let extensionId = args["extension_id"] as! String
+            let authCode = args["auth_code"] as! String
+            GobackendSetExtensionAuthCodeByID(extensionId, authCode)
+            return nil
+            
+        case "setExtensionTokens":
+            let args = call.arguments as! [String: Any]
+            let extensionId = args["extension_id"] as! String
+            let accessToken = args["access_token"] as! String
+            let refreshToken = args["refresh_token"] as? String ?? ""
+            let expiresIn = args["expires_in"] as? Int ?? 0
+            GobackendSetExtensionTokensByID(extensionId, accessToken, refreshToken, Int(expiresIn))
+            return nil
+            
+        case "clearExtensionPendingAuth":
+            let args = call.arguments as! [String: Any]
+            let extensionId = args["extension_id"] as! String
+            GobackendClearExtensionPendingAuthByID(extensionId)
+            return nil
+            
+        case "isExtensionAuthenticated":
+            let args = call.arguments as! [String: Any]
+            let extensionId = args["extension_id"] as! String
+            let response = GobackendIsExtensionAuthenticatedByID(extensionId)
+            return response
+            
+        case "getAllPendingAuthRequests":
+            let response = GobackendGetAllPendingAuthRequestsJSON(&error)
+            if let error = error { throw error }
+            return response
+            
+        // Extension FFmpeg API
+        case "getPendingFFmpegCommand":
+            let args = call.arguments as! [String: Any]
+            let commandId = args["command_id"] as! String
+            let response = GobackendGetPendingFFmpegCommandJSON(commandId, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "setFFmpegCommandResult":
+            let args = call.arguments as! [String: Any]
+            let commandId = args["command_id"] as! String
+            let success = args["success"] as? Bool ?? false
+            let output = args["output"] as? String ?? ""
+            let errorMsg = args["error"] as? String ?? ""
+            GobackendSetFFmpegCommandResult(commandId, success, output, errorMsg)
+            return nil
+            
+        case "getAllPendingFFmpegCommands":
+            let response = GobackendGetAllPendingFFmpegCommandsJSON(&error)
+            if let error = error { throw error }
+            return response
+            
+        // Extension Custom Search API
+        case "customSearchWithExtension":
+            let args = call.arguments as! [String: Any]
+            let extensionId = args["extension_id"] as! String
+            let query = args["query"] as! String
+            let optionsJson = args["options"] as? String ?? ""
+            let response = GobackendCustomSearchWithExtensionJSON(extensionId, query, optionsJson, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "getSearchProviders":
+            let response = GobackendGetSearchProvidersJSON(&error)
+            if let error = error { throw error }
+            return response
+            
+        // Extension URL Handler API
+        case "handleURLWithExtension":
+            let args = call.arguments as! [String: Any]
+            let url = args["url"] as! String
+            let response = GobackendHandleURLWithExtensionJSON(url, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "findURLHandler":
+            let args = call.arguments as! [String: Any]
+            let url = args["url"] as! String
+            let response = GobackendFindURLHandlerJSON(url)
+            return response
+            
+        case "getURLHandlers":
+            let response = GobackendGetURLHandlersJSON(&error)
+            if let error = error { throw error }
+            return response
+            
+        // Extension Post-Processing API
+        case "runPostProcessing":
+            let args = call.arguments as! [String: Any]
+            let filePath = args["file_path"] as! String
+            let metadataJson = args["metadata"] as? String ?? ""
+            let response = GobackendRunPostProcessingJSON(filePath, metadataJson, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "getPostProcessingProviders":
+            let response = GobackendGetPostProcessingProvidersJSON(&error)
+            if let error = error { throw error }
+            return response
+            
+        // Extension Store
+        case "initExtensionStore":
+            let args = call.arguments as! [String: Any]
+            let cacheDir = args["cache_dir"] as! String
+            GobackendInitExtensionStoreJSON(cacheDir, &error)
+            if let error = error { throw error }
+            return nil
+            
+        case "getStoreExtensions":
+            let args = call.arguments as! [String: Any]
+            let forceRefresh = args["force_refresh"] as? Bool ?? false
+            let response = GobackendGetStoreExtensionsJSON(forceRefresh, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "searchStoreExtensions":
+            let args = call.arguments as! [String: Any]
+            let query = args["query"] as? String ?? ""
+            let category = args["category"] as? String ?? ""
+            let response = GobackendSearchStoreExtensionsJSON(query, category, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "getStoreCategories":
+            let response = GobackendGetStoreCategoriesJSON(&error)
+            if let error = error { throw error }
+            return response
+            
+        case "downloadStoreExtension":
+            let args = call.arguments as! [String: Any]
+            let extensionId = args["extension_id"] as! String
+            let destDir = args["dest_dir"] as! String
+            let response = GobackendDownloadStoreExtensionJSON(extensionId, destDir, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "clearStoreCache":
+            GobackendClearStoreCacheJSON(&error)
+            if let error = error { throw error }
+            return nil
+            
        default:
            throw NSError(
                domain: "SpotiFLAC",
@@ -1,8 +1,8 @@
 /// App version and info constants
 /// Update version here only - all other files will reference this
 class AppInfo {
-  static const String version = '2.2.0';
-  static const String buildNumber = '46';
+  static const String version = '3.0.0';
+  static const String buildNumber = '57';
  static const String fullVersion = '$version+$buildNumber';
  
  
@@ -1,7 +1,10 @@
+import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:path_provider/path_provider.dart';
 import 'package:spotiflac_android/app.dart';
 import 'package:spotiflac_android/providers/download_queue_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
 import 'package:spotiflac_android/services/notification_service.dart';
 import 'package:spotiflac_android/services/share_intent_service.dart';

@@ -24,14 +27,42 @@ void main() async {
 }

 /// Widget to eagerly initialize providers that need to load data on startup
-class _EagerInitialization extends ConsumerWidget {
+class _EagerInitialization extends ConsumerStatefulWidget {
  const _EagerInitialization({required this.child});
  final Widget child;

  @override
-  Widget build(BuildContext context, WidgetRef ref) {
+  ConsumerState<_EagerInitialization> createState() => _EagerInitializationState();
+}
+
+class _EagerInitializationState extends ConsumerState<_EagerInitialization> {
+  @override
+  void initState() {
+    super.initState();
+    _initializeExtensions();
+  }
+
+  Future<void> _initializeExtensions() async {
+    try {
+      final appDir = await getApplicationDocumentsDirectory();
+      final extensionsDir = '${appDir.path}/extensions';
+      final dataDir = '${appDir.path}/extension_data';
+      
+      // Create directories if needed
+      await Directory(extensionsDir).create(recursive: true);
+      await Directory(dataDir).create(recursive: true);
+      
+      // Initialize extension system
+      await ref.read(extensionProvider.notifier).initialize(extensionsDir, dataDir);
+    } catch (e) {
+      debugPrint('Failed to initialize extensions: $e');
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
    // Eagerly initialize download history provider to load from storage
    ref.watch(downloadHistoryProvider);
-    return child;
+    return widget.child;
  }
 }
@@ -19,6 +19,7 @@ enum DownloadErrorType {
  notFound,    // Track not found on any service
  rateLimit,   // Rate limited by service
  network,     // Network/connection error
+  permission,  // File/folder permission error
 }

@JsonSerializable()
@@ -88,6 +89,8 @@ class DownloadItem {
        return 'Rate limit reached, try again later';
      case DownloadErrorType.network:
        return 'Connection failed, check your internet';
+      case DownloadErrorType.permission:
+        return 'Cannot write to folder, check storage permission';
      default:
        return error ?? 'An error occurred';
    }
@@ -51,4 +51,5 @@ const _$DownloadErrorTypeEnumMap = {
  DownloadErrorType.notFound: 'notFound',
  DownloadErrorType.rateLimit: 'rateLimit',
  DownloadErrorType.network: 'network',
+  DownloadErrorType.permission: 'permission',
 };
@@ -18,11 +18,18 @@ class AppSettings {
  final bool hasSearchedBefore; // Hide helper text after first search
  final String folderOrganization; // none, artist, album, artist_album
  final String historyViewMode; // list, grid
+  final String historyFilterMode; // all, albums, singles
  final bool askQualityBeforeDownload; // Show quality picker before each download
  final String spotifyClientId; // Custom Spotify client ID (empty = use default)
  final String spotifyClientSecret; // Custom Spotify client secret (empty = use default)
  final bool useCustomSpotifyCredentials; // Whether to use custom credentials (if set)
  final String metadataSource; // spotify, deezer - source for search and metadata
+  final bool enableLogging; // Enable detailed logging for debugging
+  final bool useExtensionProviders; // Use extension providers for downloads when available
+  final String? searchProvider; // null/empty = default (Deezer/Spotify), otherwise extension ID
+  final bool separateSingles; // Separate singles/EPs into their own folder
+  final String albumFolderStructure; // artist_album or album_only
+  final bool showExtensionStore; // Show Extension Store tab in navigation

  const AppSettings({
    this.defaultService = 'tidal',
@@ -39,11 +46,18 @@ class AppSettings {
    this.hasSearchedBefore = false, // Default: show helper text
    this.folderOrganization = 'none', // Default: no folder organization
    this.historyViewMode = 'grid', // Default: grid view
+    this.historyFilterMode = 'all', // Default: show all
    this.askQualityBeforeDownload = true, // Default: ask quality before download
    this.spotifyClientId = '', // Default: use built-in credentials
    this.spotifyClientSecret = '', // Default: use built-in credentials
    this.useCustomSpotifyCredentials = true, // Default: use custom if set
    this.metadataSource = 'deezer', // Default: Deezer (no rate limit)
+    this.enableLogging = false, // Default: disabled for performance
+    this.useExtensionProviders = true, // Default: use extensions when available
+    this.searchProvider, // Default: null (use Deezer/Spotify)
+    this.separateSingles = false, // Default: disabled
+    this.albumFolderStructure = 'artist_album', // Default: Albums/Artist/Album
+    this.showExtensionStore = true, // Default: show store
  });

  AppSettings copyWith({
@@ -61,11 +75,19 @@ class AppSettings {
    bool? hasSearchedBefore,
    String? folderOrganization,
    String? historyViewMode,
+    String? historyFilterMode,
    bool? askQualityBeforeDownload,
    String? spotifyClientId,
    String? spotifyClientSecret,
    bool? useCustomSpotifyCredentials,
    String? metadataSource,
+    bool? enableLogging,
+    bool? useExtensionProviders,
+    String? searchProvider,
+    bool clearSearchProvider = false, // Set to true to clear searchProvider to null
+    bool? separateSingles,
+    String? albumFolderStructure,
+    bool? showExtensionStore,
  }) {
    return AppSettings(
      defaultService: defaultService ?? this.defaultService,
@@ -82,11 +104,18 @@ class AppSettings {
      hasSearchedBefore: hasSearchedBefore ?? this.hasSearchedBefore,
      folderOrganization: folderOrganization ?? this.folderOrganization,
      historyViewMode: historyViewMode ?? this.historyViewMode,
+      historyFilterMode: historyFilterMode ?? this.historyFilterMode,
      askQualityBeforeDownload: askQualityBeforeDownload ?? this.askQualityBeforeDownload,
      spotifyClientId: spotifyClientId ?? this.spotifyClientId,
      spotifyClientSecret: spotifyClientSecret ?? this.spotifyClientSecret,
      useCustomSpotifyCredentials: useCustomSpotifyCredentials ?? this.useCustomSpotifyCredentials,
      metadataSource: metadataSource ?? this.metadataSource,
+      enableLogging: enableLogging ?? this.enableLogging,
+      useExtensionProviders: useExtensionProviders ?? this.useExtensionProviders,
+      searchProvider: clearSearchProvider ? null : (searchProvider ?? this.searchProvider),
+      separateSingles: separateSingles ?? this.separateSingles,
+      albumFolderStructure: albumFolderStructure ?? this.albumFolderStructure,
+      showExtensionStore: showExtensionStore ?? this.showExtensionStore,
    );
  }

@@ -21,12 +21,19 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
  hasSearchedBefore: json['hasSearchedBefore'] as bool? ?? false,
  folderOrganization: json['folderOrganization'] as String? ?? 'none',
  historyViewMode: json['historyViewMode'] as String? ?? 'grid',
+  historyFilterMode: json['historyFilterMode'] as String? ?? 'all',
  askQualityBeforeDownload: json['askQualityBeforeDownload'] as bool? ?? true,
  spotifyClientId: json['spotifyClientId'] as String? ?? '',
  spotifyClientSecret: json['spotifyClientSecret'] as String? ?? '',
  useCustomSpotifyCredentials:
      json['useCustomSpotifyCredentials'] as bool? ?? true,
  metadataSource: json['metadataSource'] as String? ?? 'deezer',
+  enableLogging: json['enableLogging'] as bool? ?? false,
+  useExtensionProviders: json['useExtensionProviders'] as bool? ?? true,
+  searchProvider: json['searchProvider'] as String?,
+  separateSingles: json['separateSingles'] as bool? ?? false,
+  albumFolderStructure: json['albumFolderStructure'] as String? ?? 'artist_album',
+  showExtensionStore: json['showExtensionStore'] as bool? ?? true,
 );

 Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
@@ -45,9 +52,16 @@ Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
      'hasSearchedBefore': instance.hasSearchedBefore,
      'folderOrganization': instance.folderOrganization,
      'historyViewMode': instance.historyViewMode,
+      'historyFilterMode': instance.historyFilterMode,
      'askQualityBeforeDownload': instance.askQualityBeforeDownload,
      'spotifyClientId': instance.spotifyClientId,
      'spotifyClientSecret': instance.spotifyClientSecret,
      'useCustomSpotifyCredentials': instance.useCustomSpotifyCredentials,
      'metadataSource': instance.metadataSource,
+      'enableLogging': instance.enableLogging,
+      'useExtensionProviders': instance.useExtensionProviders,
+      'searchProvider': instance.searchProvider,
+      'separateSingles': instance.separateSingles,
+      'albumFolderStructure': instance.albumFolderStructure,
+      'showExtensionStore': instance.showExtensionStore,
    };
@@ -18,6 +18,8 @@ class Track {
  final String? releaseDate;
  final String? deezerId;
  final ServiceAvailability? availability;
+  final String? source; // Extension ID that provided this track (null for built-in sources)
+  final String? albumType; // album, single, ep, compilation (from metadata API)

  const Track({
    required this.id,
@@ -33,10 +35,18 @@ class Track {
    this.releaseDate,
    this.deezerId,
    this.availability,
+    this.source,
+    this.albumType,
  });

+  /// Check if this track is a single (based on album_type metadata)
+  bool get isSingle => albumType == 'single' || albumType == 'ep';
+
  factory Track.fromJson(Map<String, dynamic> json) => _$TrackFromJson(json);
  Map<String, dynamic> toJson() => _$TrackToJson(this);
+  
+  /// Check if this track is from an extension
+  bool get isFromExtension => source != null && source!.isNotEmpty;
 }

@JsonSerializable()
@@ -24,6 +24,8 @@ Track _$TrackFromJson(Map<String, dynamic> json) => Track(
      : ServiceAvailability.fromJson(
          json['availability'] as Map<String, dynamic>,
        ),
+  source: json['source'] as String?,
+  albumType: json['albumType'] as String?,
 );

 Map<String, dynamic> _$TrackToJson(Track instance) => <String, dynamic>{
@@ -40,6 +42,8 @@ Map<String, dynamic> _$TrackToJson(Track instance) => <String, dynamic>{
  'releaseDate': instance.releaseDate,
  'deezerId': instance.deezerId,
  'availability': instance.availability,
+  'source': instance.source,
+  'albumType': instance.albumType,
 };

 ServiceAvailability _$ServiceAvailabilityFromJson(Map<String, dynamic> json) =>
@@ -0,0 +1,715 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/services/platform_bridge.dart';
+import 'package:spotiflac_android/utils/logger.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
+
+final _log = AppLogger('ExtensionProvider');
+
+/// Represents an installed extension
+class Extension {
+  final String id;
+  final String name;
+  final String displayName;
+  final String version;
+  final String author;
+  final String description;
+  final bool enabled;
+  final String status; // 'loaded', 'error', 'disabled'
+  final String? errorMessage;
+  final String? iconPath; // Path to extension icon
+  final List<String> permissions;
+  final List<ExtensionSetting> settings;
+  final List<QualityOption> qualityOptions; // Custom quality options for download providers
+  final bool hasMetadataProvider;
+  final bool hasDownloadProvider;
+  final bool skipMetadataEnrichment; // If true, use metadata from extension instead of enriching
+  final SearchBehavior? searchBehavior; // Custom search behavior
+  final URLHandler? urlHandler; // Custom URL handling
+  final TrackMatching? trackMatching; // Custom track matching
+  final PostProcessing? postProcessing; // Post-processing hooks
+
+  const Extension({
+    required this.id,
+    required this.name,
+    required this.displayName,
+    required this.version,
+    required this.author,
+    required this.description,
+    required this.enabled,
+    required this.status,
+    this.errorMessage,
+    this.iconPath,
+    this.permissions = const [],
+    this.settings = const [],
+    this.qualityOptions = const [],
+    this.hasMetadataProvider = false,
+    this.hasDownloadProvider = false,
+    this.skipMetadataEnrichment = false,
+    this.searchBehavior,
+    this.urlHandler,
+    this.trackMatching,
+    this.postProcessing,
+  });
+
+  factory Extension.fromJson(Map<String, dynamic> json) {
+    return Extension(
+      id: json['id'] as String? ?? '',
+      name: json['name'] as String? ?? '',
+      displayName: json['display_name'] as String? ?? json['name'] as String? ?? '',
+      version: json['version'] as String? ?? '0.0.0',
+      author: json['author'] as String? ?? 'Unknown',
+      description: json['description'] as String? ?? '',
+      enabled: json['enabled'] as bool? ?? false,
+      status: json['status'] as String? ?? 'loaded',
+      errorMessage: json['error_message'] as String?,
+      iconPath: json['icon_path'] as String?,
+      permissions: (json['permissions'] as List<dynamic>?)?.cast<String>() ?? [],
+      settings: (json['settings'] as List<dynamic>?)
+          ?.map((s) => ExtensionSetting.fromJson(s as Map<String, dynamic>))
+          .toList() ?? [],
+      qualityOptions: (json['quality_options'] as List<dynamic>?)
+          ?.map((q) => QualityOption.fromJson(q as Map<String, dynamic>))
+          .toList() ?? [],
+      hasMetadataProvider: json['has_metadata_provider'] as bool? ?? false,
+      hasDownloadProvider: json['has_download_provider'] as bool? ?? false,
+      skipMetadataEnrichment: json['skip_metadata_enrichment'] as bool? ?? false,
+      searchBehavior: json['search_behavior'] != null 
+          ? SearchBehavior.fromJson(json['search_behavior'] as Map<String, dynamic>)
+          : null,
+      urlHandler: json['url_handler'] != null
+          ? URLHandler.fromJson(json['url_handler'] as Map<String, dynamic>)
+          : null,
+      trackMatching: json['track_matching'] != null
+          ? TrackMatching.fromJson(json['track_matching'] as Map<String, dynamic>)
+          : null,
+      postProcessing: json['post_processing'] != null
+          ? PostProcessing.fromJson(json['post_processing'] as Map<String, dynamic>)
+          : null,
+    );
+  }
+
+  Extension copyWith({
+    String? id,
+    String? name,
+    String? displayName,
+    String? version,
+    String? author,
+    String? description,
+    bool? enabled,
+    String? status,
+    String? errorMessage,
+    String? iconPath,
+    List<String>? permissions,
+    List<ExtensionSetting>? settings,
+    List<QualityOption>? qualityOptions,
+    bool? hasMetadataProvider,
+    bool? hasDownloadProvider,
+    bool? skipMetadataEnrichment,
+    SearchBehavior? searchBehavior,
+    URLHandler? urlHandler,
+    TrackMatching? trackMatching,
+    PostProcessing? postProcessing,
+  }) {
+    return Extension(
+      id: id ?? this.id,
+      name: name ?? this.name,
+      displayName: displayName ?? this.displayName,
+      version: version ?? this.version,
+      author: author ?? this.author,
+      description: description ?? this.description,
+      enabled: enabled ?? this.enabled,
+      status: status ?? this.status,
+      errorMessage: errorMessage ?? this.errorMessage,
+      iconPath: iconPath ?? this.iconPath,
+      permissions: permissions ?? this.permissions,
+      settings: settings ?? this.settings,
+      qualityOptions: qualityOptions ?? this.qualityOptions,
+      hasMetadataProvider: hasMetadataProvider ?? this.hasMetadataProvider,
+      hasDownloadProvider: hasDownloadProvider ?? this.hasDownloadProvider,
+      skipMetadataEnrichment: skipMetadataEnrichment ?? this.skipMetadataEnrichment,
+      searchBehavior: searchBehavior ?? this.searchBehavior,
+      urlHandler: urlHandler ?? this.urlHandler,
+      trackMatching: trackMatching ?? this.trackMatching,
+      postProcessing: postProcessing ?? this.postProcessing,
+    );
+  }
+
+  bool get hasCustomSearch => searchBehavior?.enabled ?? false;
+  bool get hasURLHandler => urlHandler?.enabled ?? false;
+  bool get hasCustomMatching => trackMatching?.customMatching ?? false;
+  bool get hasPostProcessing => postProcessing?.enabled ?? false;
+}
+
+/// Custom search behavior configuration
+class SearchBehavior {
+  final bool enabled;
+  final String? placeholder;
+  final bool primary;
+  final String? icon;
+  final String? thumbnailRatio; // "square" (1:1), "wide" (16:9), "portrait" (2:3)
+  final int? thumbnailWidth;
+  final int? thumbnailHeight;
+
+  const SearchBehavior({
+    required this.enabled,
+    this.placeholder,
+    this.primary = false,
+    this.icon,
+    this.thumbnailRatio,
+    this.thumbnailWidth,
+    this.thumbnailHeight,
+  });
+
+  factory SearchBehavior.fromJson(Map<String, dynamic> json) {
+    return SearchBehavior(
+      enabled: json['enabled'] as bool? ?? false,
+      placeholder: json['placeholder'] as String?,
+      primary: json['primary'] as bool? ?? false,
+      icon: json['icon'] as String?,
+      thumbnailRatio: json['thumbnailRatio'] as String?,
+      thumbnailWidth: json['thumbnailWidth'] as int?,
+      thumbnailHeight: json['thumbnailHeight'] as int?,
+    );
+  }
+
+  /// Get thumbnail size based on configuration
+  /// Returns (width, height) tuple
+  (double, double) getThumbnailSize({double defaultSize = 56}) {
+    // If custom dimensions specified, use them
+    if (thumbnailWidth != null && thumbnailHeight != null) {
+      return (thumbnailWidth!.toDouble(), thumbnailHeight!.toDouble());
+    }
+    
+    // Otherwise use ratio presets
+    switch (thumbnailRatio) {
+      case 'wide': // 16:9 - YouTube style
+        return (defaultSize * 16 / 9, defaultSize);
+      case 'portrait': // 2:3 - Poster style
+        return (defaultSize * 2 / 3, defaultSize);
+      case 'square': // 1:1 - Album art style
+      default:
+        return (defaultSize, defaultSize);
+    }
+  }
+}
+
+/// Custom track matching configuration
+class TrackMatching {
+  final bool customMatching;
+  final String? strategy; // "isrc", "name", "duration", "custom"
+  final int durationTolerance; // in seconds
+
+  const TrackMatching({
+    required this.customMatching,
+    this.strategy,
+    this.durationTolerance = 3,
+  });
+
+  factory TrackMatching.fromJson(Map<String, dynamic> json) {
+    return TrackMatching(
+      customMatching: json['customMatching'] as bool? ?? false,
+      strategy: json['strategy'] as String?,
+      durationTolerance: json['durationTolerance'] as int? ?? 3,
+    );
+  }
+}
+
+/// Post-processing configuration
+class PostProcessing {
+  final bool enabled;
+  final List<PostProcessingHook> hooks;
+
+  const PostProcessing({
+    required this.enabled,
+    this.hooks = const [],
+  });
+
+  factory PostProcessing.fromJson(Map<String, dynamic> json) {
+    return PostProcessing(
+      enabled: json['enabled'] as bool? ?? false,
+      hooks: (json['hooks'] as List<dynamic>?)
+          ?.map((h) => PostProcessingHook.fromJson(h as Map<String, dynamic>))
+          .toList() ?? [],
+    );
+  }
+}
+
+/// URL handler configuration for custom URL patterns
+class URLHandler {
+  final bool enabled;
+  final List<String> patterns;
+
+  const URLHandler({
+    required this.enabled,
+    this.patterns = const [],
+  });
+
+  factory URLHandler.fromJson(Map<String, dynamic> json) {
+    return URLHandler(
+      enabled: json['enabled'] as bool? ?? false,
+      patterns: (json['patterns'] as List<dynamic>?)?.cast<String>() ?? [],
+    );
+  }
+
+  /// Check if a URL matches any of the patterns
+  bool matchesURL(String url) {
+    if (!enabled || patterns.isEmpty) return false;
+    final lowerUrl = url.toLowerCase();
+    for (final pattern in patterns) {
+      if (lowerUrl.contains(pattern.toLowerCase())) {
+        return true;
+      }
+    }
+    return false;
+  }
+}
+
+/// A post-processing hook
+class PostProcessingHook {
+  final String id;
+  final String name;
+  final String? description;
+  final bool defaultEnabled;
+  final List<String> supportedFormats;
+
+  const PostProcessingHook({
+    required this.id,
+    required this.name,
+    this.description,
+    this.defaultEnabled = false,
+    this.supportedFormats = const [],
+  });
+
+  factory PostProcessingHook.fromJson(Map<String, dynamic> json) {
+    return PostProcessingHook(
+      id: json['id'] as String? ?? '',
+      name: json['name'] as String? ?? '',
+      description: json['description'] as String?,
+      defaultEnabled: json['defaultEnabled'] as bool? ?? false,
+      supportedFormats: (json['supportedFormats'] as List<dynamic>?)?.cast<String>() ?? [],
+    );
+  }
+}
+
+/// Represents a quality option for download providers
+class QualityOption {
+  final String id;
+  final String label;
+  final String? description;
+  final List<QualitySpecificSetting> settings; // Quality-specific settings
+
+  const QualityOption({
+    required this.id,
+    required this.label,
+    this.description,
+    this.settings = const [],
+  });
+
+  factory QualityOption.fromJson(Map<String, dynamic> json) {
+    return QualityOption(
+      id: json['id'] as String? ?? '',
+      label: json['label'] as String? ?? '',
+      description: json['description'] as String?,
+      settings: (json['settings'] as List<dynamic>?)
+          ?.map((s) => QualitySpecificSetting.fromJson(s as Map<String, dynamic>))
+          .toList() ?? [],
+    );
+  }
+}
+
+/// Represents a setting that's specific to a quality option
+class QualitySpecificSetting {
+  final String key;
+  final String label;
+  final String type; // 'string', 'number', 'boolean', 'select'
+  final dynamic defaultValue;
+  final String? description;
+  final List<String>? options; // For select type
+  final bool required;
+  final bool secret;
+
+  const QualitySpecificSetting({
+    required this.key,
+    required this.label,
+    required this.type,
+    this.defaultValue,
+    this.description,
+    this.options,
+    this.required = false,
+    this.secret = false,
+  });
+
+  factory QualitySpecificSetting.fromJson(Map<String, dynamic> json) {
+    return QualitySpecificSetting(
+      key: json['key'] as String? ?? '',
+      label: json['label'] as String? ?? '',
+      type: json['type'] as String? ?? 'string',
+      defaultValue: json['default'],
+      description: json['description'] as String?,
+      options: (json['options'] as List<dynamic>?)?.cast<String>(),
+      required: json['required'] as bool? ?? false,
+      secret: json['secret'] as bool? ?? false,
+    );
+  }
+}
+
+/// Represents a setting field for an extension
+class ExtensionSetting {
+  final String key;
+  final String label;
+  final String type; // 'string', 'number', 'boolean', 'select'
+  final dynamic defaultValue;
+  final String? description;
+  final List<String>? options; // For select type
+  final bool required;
+
+  const ExtensionSetting({
+    required this.key,
+    required this.label,
+    required this.type,
+    this.defaultValue,
+    this.description,
+    this.options,
+    this.required = false,
+  });
+
+  factory ExtensionSetting.fromJson(Map<String, dynamic> json) {
+    return ExtensionSetting(
+      key: json['key'] as String? ?? '',
+      label: json['label'] as String? ?? '',
+      type: json['type'] as String? ?? 'string',
+      defaultValue: json['default'],
+      description: json['description'] as String?,
+      options: (json['options'] as List<dynamic>?)?.cast<String>(),
+      required: json['required'] as bool? ?? false,
+    );
+  }
+}
+
+/// State for extension management
+class ExtensionState {
+  final List<Extension> extensions;
+  final List<String> providerPriority;
+  final List<String> metadataProviderPriority;
+  final bool isLoading;
+  final String? error;
+  final bool isInitialized;
+
+  const ExtensionState({
+    this.extensions = const [],
+    this.providerPriority = const [],
+    this.metadataProviderPriority = const [],
+    this.isLoading = false,
+    this.error,
+    this.isInitialized = false,
+  });
+
+  ExtensionState copyWith({
+    List<Extension>? extensions,
+    List<String>? providerPriority,
+    List<String>? metadataProviderPriority,
+    bool? isLoading,
+    String? error,
+    bool? isInitialized,
+  }) {
+    return ExtensionState(
+      extensions: extensions ?? this.extensions,
+      providerPriority: providerPriority ?? this.providerPriority,
+      metadataProviderPriority: metadataProviderPriority ?? this.metadataProviderPriority,
+      isLoading: isLoading ?? this.isLoading,
+      error: error,
+      isInitialized: isInitialized ?? this.isInitialized,
+    );
+  }
+}
+
+
+/// Provider for managing extensions
+class ExtensionNotifier extends Notifier<ExtensionState> {
+  @override
+  ExtensionState build() {
+    return const ExtensionState();
+  }
+
+  /// Initialize the extension system
+  Future<void> initialize(String extensionsDir, String dataDir) async {
+    if (state.isInitialized) return;
+    
+    state = state.copyWith(isLoading: true, error: null);
+    
+    try {
+      await PlatformBridge.initExtensionSystem(extensionsDir, dataDir);
+      await loadExtensions(extensionsDir);
+      await loadProviderPriority();
+      await loadMetadataProviderPriority();
+      state = state.copyWith(isInitialized: true, isLoading: false);
+      _log.i('Extension system initialized');
+    } catch (e) {
+      _log.e('Failed to initialize extension system: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+    }
+  }
+
+  /// Load all extensions from directory
+  Future<void> loadExtensions(String dirPath) async {
+    state = state.copyWith(isLoading: true, error: null);
+    
+    try {
+      final result = await PlatformBridge.loadExtensionsFromDir(dirPath);
+      _log.d('Load extensions result: $result');
+      await refreshExtensions();
+      state = state.copyWith(isLoading: false);
+    } catch (e) {
+      _log.e('Failed to load extensions: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+    }
+  }
+
+  /// Refresh the list of installed extensions
+  Future<void> refreshExtensions() async {
+    try {
+      final list = await PlatformBridge.getInstalledExtensions();
+      final extensions = list.map((e) => Extension.fromJson(e)).toList();
+      state = state.copyWith(extensions: extensions);
+      _log.d('Loaded ${extensions.length} extensions');
+      
+      // Log search behavior for extensions that have it
+      for (final ext in extensions) {
+        if (ext.searchBehavior != null) {
+          _log.d('Extension ${ext.id}: thumbnailRatio=${ext.searchBehavior!.thumbnailRatio}');
+        }
+      }
+    } catch (e) {
+      _log.e('Failed to refresh extensions: $e');
+      state = state.copyWith(error: e.toString());
+    }
+  }
+
+  /// Clear any error state
+  void clearError() {
+    state = state.copyWith(error: null);
+  }
+
+  /// Install extension from file (auto-upgrades if already installed with newer version)
+  Future<bool> installExtension(String filePath) async {
+    state = state.copyWith(isLoading: true, error: null);
+    
+    try {
+      final result = await PlatformBridge.loadExtensionFromPath(filePath);
+      _log.i('Installed extension: ${result['name']}');
+      await refreshExtensions();
+      state = state.copyWith(isLoading: false);
+      return true;
+    } catch (e) {
+      _log.e('Failed to install extension: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+      return false;
+    }
+  }
+
+  /// Check if a package file is an upgrade for an existing extension
+  /// Returns: {extension_id, current_version, new_version, can_upgrade, is_installed}
+  Future<Map<String, dynamic>> checkExtensionUpgrade(String filePath) async {
+    try {
+      return await PlatformBridge.checkExtensionUpgrade(filePath);
+    } catch (e) {
+      _log.e('Failed to check extension upgrade: $e');
+      return {'error': e.toString()};
+    }
+  }
+
+  /// Upgrade an existing extension from a new package file
+  Future<bool> upgradeExtension(String filePath) async {
+    state = state.copyWith(isLoading: true, error: null);
+    
+    try {
+      final result = await PlatformBridge.upgradeExtension(filePath);
+      _log.i('Upgraded extension: ${result['display_name']} to v${result['version']}');
+      await refreshExtensions();
+      state = state.copyWith(isLoading: false);
+      return true;
+    } catch (e) {
+      _log.e('Failed to upgrade extension: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+      return false;
+    }
+  }
+
+  /// Uninstall/remove an extension
+  Future<bool> removeExtension(String extensionId) async {
+    state = state.copyWith(isLoading: true, error: null);
+    
+    try {
+      await PlatformBridge.removeExtension(extensionId);
+      _log.i('Removed extension: $extensionId');
+      await refreshExtensions();
+      state = state.copyWith(isLoading: false);
+      return true;
+    } catch (e) {
+      _log.e('Failed to remove extension: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+      return false;
+    }
+  }
+
+  /// Enable or disable an extension
+  Future<void> setExtensionEnabled(String extensionId, bool enabled) async {
+    try {
+      await PlatformBridge.setExtensionEnabled(extensionId, enabled);
+      _log.d('Set extension $extensionId enabled: $enabled');
+      
+      // Get extension info before updating state
+      final ext = state.extensions.where((e) => e.id == extensionId).firstOrNull;
+      
+      // Update local state
+      final extensions = state.extensions.map((e) {
+        if (e.id == extensionId) {
+          return e.copyWith(enabled: enabled);
+        }
+        return e;
+      }).toList();
+      
+      state = state.copyWith(extensions: extensions);
+      
+      // If disabling an extension, reset related settings
+      if (!enabled && ext != null) {
+        final settings = ref.read(settingsProvider);
+        
+        // If this extension was the search provider, clear it and reset to Deezer
+        if (settings.searchProvider == extensionId) {
+          ref.read(settingsProvider.notifier).setSearchProvider(null);
+          ref.read(settingsProvider.notifier).setMetadataSource('deezer');
+          _log.d('Cleared search provider and reset to Deezer because extension $extensionId was disabled');
+        }
+        
+        // If this extension was the default download service, reset to Tidal
+        if (ext.hasDownloadProvider && settings.defaultService == extensionId) {
+          ref.read(settingsProvider.notifier).setDefaultService('tidal');
+          _log.d('Reset default service to Tidal because extension $extensionId was disabled');
+        }
+      }
+    } catch (e) {
+      _log.e('Failed to set extension enabled: $e');
+      state = state.copyWith(error: e.toString());
+    }
+  }
+
+  /// Get settings for an extension
+  Future<Map<String, dynamic>> getExtensionSettings(String extensionId) async {
+    try {
+      return await PlatformBridge.getExtensionSettings(extensionId);
+    } catch (e) {
+      _log.e('Failed to get extension settings: $e');
+      return {};
+    }
+  }
+
+  /// Update settings for an extension
+  Future<void> setExtensionSettings(String extensionId, Map<String, dynamic> settings) async {
+    try {
+      await PlatformBridge.setExtensionSettings(extensionId, settings);
+      _log.d('Updated settings for extension: $extensionId');
+    } catch (e) {
+      _log.e('Failed to set extension settings: $e');
+      state = state.copyWith(error: e.toString());
+    }
+  }
+
+  /// Load provider priority order
+  Future<void> loadProviderPriority() async {
+    try {
+      final priority = await PlatformBridge.getProviderPriority();
+      state = state.copyWith(providerPriority: priority);
+    } catch (e) {
+      _log.e('Failed to load provider priority: $e');
+    }
+  }
+
+  /// Set provider priority order
+  Future<void> setProviderPriority(List<String> priority) async {
+    try {
+      await PlatformBridge.setProviderPriority(priority);
+      state = state.copyWith(providerPriority: priority);
+      _log.d('Updated provider priority: $priority');
+    } catch (e) {
+      _log.e('Failed to set provider priority: $e');
+      state = state.copyWith(error: e.toString());
+    }
+  }
+
+  /// Load metadata provider priority order
+  Future<void> loadMetadataProviderPriority() async {
+    try {
+      final priority = await PlatformBridge.getMetadataProviderPriority();
+      state = state.copyWith(metadataProviderPriority: priority);
+    } catch (e) {
+      _log.e('Failed to load metadata provider priority: $e');
+    }
+  }
+
+  /// Set metadata provider priority order
+  Future<void> setMetadataProviderPriority(List<String> priority) async {
+    try {
+      await PlatformBridge.setMetadataProviderPriority(priority);
+      state = state.copyWith(metadataProviderPriority: priority);
+      _log.d('Updated metadata provider priority: $priority');
+    } catch (e) {
+      _log.e('Failed to set metadata provider priority: $e');
+      state = state.copyWith(error: e.toString());
+    }
+  }
+
+  /// Cleanup all extensions (call on app close)
+  Future<void> cleanup() async {
+    try {
+      await PlatformBridge.cleanupExtensions();
+      _log.d('Extensions cleaned up');
+    } catch (e) {
+      _log.e('Failed to cleanup extensions: $e');
+    }
+  }
+
+  /// Get extension by ID
+  Extension? getExtension(String extensionId) {
+    try {
+      return state.extensions.firstWhere((ext) => ext.id == extensionId);
+    } catch (_) {
+      return null;
+    }
+  }
+
+  /// Get all enabled extensions
+  List<Extension> get enabledExtensions {
+    return state.extensions.where((ext) => ext.enabled).toList();
+  }
+
+  /// Get all download providers (built-in + extensions)
+  List<String> getAllDownloadProviders() {
+    final providers = ['tidal', 'qobuz', 'amazon'];
+    for (final ext in state.extensions) {
+      if (ext.enabled && ext.hasDownloadProvider) {
+        providers.add(ext.id);
+      }
+    }
+    return providers;
+  }
+
+  /// Get all metadata providers (built-in + extensions)
+  List<String> getAllMetadataProviders() {
+    final providers = ['deezer', 'spotify'];
+    for (final ext in state.extensions) {
+      if (ext.enabled && ext.hasMetadataProvider) {
+        providers.add(ext.id);
+      }
+    }
+    return providers;
+  }
+  /// Get all extensions that provide custom search
+  List<Extension> get searchProviders {
+    return state.extensions.where((ext) => ext.enabled && ext.hasCustomSearch).toList();
+  }
+}
+
+final extensionProvider = NotifierProvider<ExtensionNotifier, ExtensionState>(
+  ExtensionNotifier.new,
+);
@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:spotiflac_android/models/settings.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
+import 'package:spotiflac_android/utils/logger.dart';

 const _settingsKey = 'app_settings';
 const _migrationVersionKey = 'settings_migration_version';
@@ -26,6 +27,9 @@ class SettingsNotifier extends Notifier<AppSettings> {
      
      // Apply Spotify credentials to Go backend on load
      _applySpotifyCredentials();
+      
+      // Sync logging state
+      LogBuffer.loggingEnabled = state.enableLogging;
    }
  }

@@ -56,18 +60,16 @@ class SettingsNotifier extends Notifier<AppSettings> {

  /// Apply current Spotify credentials to Go backend
  Future<void> _applySpotifyCredentials() async {
-    // Only apply custom credentials if enabled and both fields are set
-    if (state.useCustomSpotifyCredentials && 
-        state.spotifyClientId.isNotEmpty && 
+    // Only apply if both fields are set
+    if (state.spotifyClientId.isNotEmpty && 
        state.spotifyClientSecret.isNotEmpty) {
      await PlatformBridge.setSpotifyCredentials(
        state.spotifyClientId,
        state.spotifyClientSecret,
      );
-    } else {
-      // Clear to use default
-      await PlatformBridge.setSpotifyCredentials('', '');
    }
+    // Note: If credentials are empty, Spotify API will return error
+    // User should use Deezer as metadata source instead
  }

  void setDefaultService(String service) {
@@ -144,6 +146,11 @@ class SettingsNotifier extends Notifier<AppSettings> {
    _saveSettings();
  }

+  void setHistoryFilterMode(String mode) {
+    state = state.copyWith(historyFilterMode: mode);
+    _saveSettings();
+  }
+
  void setAskQualityBeforeDownload(bool enabled) {
    state = state.copyWith(askQualityBeforeDownload: enabled);
    _saveSettings();
@@ -187,6 +194,42 @@ class SettingsNotifier extends Notifier<AppSettings> {
    state = state.copyWith(metadataSource: source);
    _saveSettings();
  }
+
+  void setSearchProvider(String? provider) {
+    if (provider == null || provider.isEmpty) {
+      state = state.copyWith(clearSearchProvider: true);
+    } else {
+      state = state.copyWith(searchProvider: provider);
+    }
+    _saveSettings();
+  }
+
+  void setEnableLogging(bool enabled) {
+    state = state.copyWith(enableLogging: enabled);
+    _saveSettings();
+    // Sync logging state to LogBuffer
+    LogBuffer.loggingEnabled = enabled;
+  }
+
+  void setUseExtensionProviders(bool enabled) {
+    state = state.copyWith(useExtensionProviders: enabled);
+    _saveSettings();
+  }
+
+  void setSeparateSingles(bool enabled) {
+    state = state.copyWith(separateSingles: enabled);
+    _saveSettings();
+  }
+
+  void setAlbumFolderStructure(String structure) {
+    state = state.copyWith(albumFolderStructure: structure);
+    _saveSettings();
+  }
+
+  void setShowExtensionStore(bool enabled) {
+    state = state.copyWith(showExtensionStore: enabled);
+    _saveSettings();
+  }
 }

 final settingsProvider = NotifierProvider<SettingsNotifier, AppSettings>(
@@ -0,0 +1,286 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/services/platform_bridge.dart';
+import 'package:spotiflac_android/utils/logger.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+
+final _log = AppLogger('StoreProvider');
+
+/// Extension categories
+class StoreCategory {
+  static const String metadata = 'metadata';
+  static const String download = 'download';
+  static const String utility = 'utility';
+  static const String lyrics = 'lyrics';
+  static const String integration = 'integration';
+
+  static const List<String> all = [metadata, download, utility, lyrics, integration];
+
+  static String getDisplayName(String category) {
+    switch (category) {
+      case metadata:
+        return 'Metadata';
+      case download:
+        return 'Download';
+      case utility:
+        return 'Utility';
+      case lyrics:
+        return 'Lyrics';
+      case integration:
+        return 'Integration';
+      default:
+        return category;
+    }
+  }
+}
+
+/// Represents an extension in the store
+class StoreExtension {
+  final String id;
+  final String name;
+  final String displayName;
+  final String version;
+  final String author;
+  final String description;
+  final String downloadUrl;
+  final String? iconUrl;
+  final String category;
+  final List<String> tags;
+  final int downloads;
+  final String updatedAt;
+  final String? minAppVersion;
+  final bool isInstalled;
+  final String? installedVersion;
+  final bool hasUpdate;
+
+  const StoreExtension({
+    required this.id,
+    required this.name,
+    required this.displayName,
+    required this.version,
+    required this.author,
+    required this.description,
+    required this.downloadUrl,
+    this.iconUrl,
+    required this.category,
+    this.tags = const [],
+    this.downloads = 0,
+    required this.updatedAt,
+    this.minAppVersion,
+    this.isInstalled = false,
+    this.installedVersion,
+    this.hasUpdate = false,
+  });
+
+  factory StoreExtension.fromJson(Map<String, dynamic> json) {
+    return StoreExtension(
+      id: json['id'] as String? ?? '',
+      name: json['name'] as String? ?? '',
+      displayName: json['display_name'] as String? ?? json['name'] as String? ?? '',
+      version: json['version'] as String? ?? '0.0.0',
+      author: json['author'] as String? ?? 'Unknown',
+      description: json['description'] as String? ?? '',
+      downloadUrl: json['download_url'] as String? ?? '',
+      iconUrl: json['icon_url'] as String?,
+      category: json['category'] as String? ?? 'utility',
+      tags: (json['tags'] as List<dynamic>?)?.cast<String>() ?? [],
+      downloads: json['downloads'] as int? ?? 0,
+      updatedAt: json['updated_at'] as String? ?? '',
+      minAppVersion: json['min_app_version'] as String?,
+      isInstalled: json['is_installed'] as bool? ?? false,
+      installedVersion: json['installed_version'] as String?,
+      hasUpdate: json['has_update'] as bool? ?? false,
+    );
+  }
+}
+
+/// State for extension store
+class StoreState {
+  final List<StoreExtension> extensions;
+  final String? selectedCategory;
+  final String searchQuery;
+  final bool isLoading;
+  final bool isDownloading;
+  final String? downloadingId;
+  final String? error;
+  final bool isInitialized;
+
+  const StoreState({
+    this.extensions = const [],
+    this.selectedCategory,
+    this.searchQuery = '',
+    this.isLoading = false,
+    this.isDownloading = false,
+    this.downloadingId,
+    this.error,
+    this.isInitialized = false,
+  });
+
+  StoreState copyWith({
+    List<StoreExtension>? extensions,
+    String? selectedCategory,
+    bool clearCategory = false,
+    String? searchQuery,
+    bool? isLoading,
+    bool? isDownloading,
+    String? downloadingId,
+    bool clearDownloadingId = false,
+    String? error,
+    bool clearError = false,
+    bool? isInitialized,
+  }) {
+    return StoreState(
+      extensions: extensions ?? this.extensions,
+      selectedCategory: clearCategory ? null : (selectedCategory ?? this.selectedCategory),
+      searchQuery: searchQuery ?? this.searchQuery,
+      isLoading: isLoading ?? this.isLoading,
+      isDownloading: isDownloading ?? this.isDownloading,
+      downloadingId: clearDownloadingId ? null : (downloadingId ?? this.downloadingId),
+      error: clearError ? null : (error ?? this.error),
+      isInitialized: isInitialized ?? this.isInitialized,
+    );
+  }
+
+  /// Get filtered extensions based on category and search
+  List<StoreExtension> get filteredExtensions {
+    var result = extensions;
+
+    if (selectedCategory != null) {
+      result = result.where((e) => e.category == selectedCategory).toList();
+    }
+
+    if (searchQuery.isNotEmpty) {
+      final query = searchQuery.toLowerCase();
+      result = result.where((e) =>
+        e.name.toLowerCase().contains(query) ||
+        e.displayName.toLowerCase().contains(query) ||
+        e.description.toLowerCase().contains(query) ||
+        e.author.toLowerCase().contains(query) ||
+        e.tags.any((t) => t.toLowerCase().contains(query))
+      ).toList();
+    }
+
+    return result;
+  }
+}
+
+/// Provider for managing extension store
+class StoreNotifier extends Notifier<StoreState> {
+  @override
+  StoreState build() {
+    return const StoreState();
+  }
+
+  /// Initialize the store
+  Future<void> initialize(String cacheDir) async {
+    if (state.isInitialized) return;
+
+    state = state.copyWith(isLoading: true, clearError: true);
+
+    try {
+      await PlatformBridge.initExtensionStore(cacheDir);
+      await refresh();
+      state = state.copyWith(isInitialized: true, isLoading: false);
+      _log.i('Extension store initialized');
+    } catch (e) {
+      _log.e('Failed to initialize store: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+    }
+  }
+
+  /// Refresh extensions from store
+  Future<void> refresh({bool forceRefresh = false}) async {
+    state = state.copyWith(isLoading: true, clearError: true);
+
+    try {
+      final extensions = await PlatformBridge.getStoreExtensions(forceRefresh: forceRefresh);
+      state = state.copyWith(
+        extensions: extensions.map((e) => StoreExtension.fromJson(e)).toList(),
+        isLoading: false,
+      );
+      _log.d('Loaded ${state.extensions.length} extensions from store');
+    } catch (e) {
+      _log.e('Failed to refresh store: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+    }
+  }
+
+  /// Set category filter
+  void setCategory(String? category) {
+    if (category == null) {
+      state = state.copyWith(clearCategory: true);
+    } else {
+      state = state.copyWith(selectedCategory: category);
+    }
+  }
+
+  /// Set search query
+  void setSearchQuery(String query) {
+    state = state.copyWith(searchQuery: query);
+  }
+
+  /// Clear search
+  void clearSearch() {
+    state = state.copyWith(searchQuery: '', clearCategory: true);
+  }
+
+  /// Download and install extension
+  Future<bool> installExtension(String extensionId, String tempDir, String extensionsDir) async {
+    state = state.copyWith(isDownloading: true, downloadingId: extensionId, clearError: true);
+
+    try {
+      _log.i('Downloading extension: $extensionId');
+      final downloadPath = await PlatformBridge.downloadStoreExtension(extensionId, tempDir);
+
+      _log.i('Installing extension from: $downloadPath');
+      final extNotifier = ref.read(extensionProvider.notifier);
+      final success = await extNotifier.installExtension(downloadPath);
+
+      if (success) {
+        _log.i('Extension installed: $extensionId');
+        await refresh();
+      }
+
+      state = state.copyWith(isDownloading: false, clearDownloadingId: true);
+      return success;
+    } catch (e) {
+      _log.e('Failed to install extension: $e');
+      state = state.copyWith(isDownloading: false, clearDownloadingId: true, error: e.toString());
+      return false;
+    }
+  }
+
+  /// Update an installed extension
+  Future<bool> updateExtension(String extensionId, String tempDir) async {
+    state = state.copyWith(isDownloading: true, downloadingId: extensionId, clearError: true);
+
+    try {
+      _log.i('Downloading update for: $extensionId');
+      final downloadPath = await PlatformBridge.downloadStoreExtension(extensionId, tempDir);
+
+      _log.i('Upgrading extension from: $downloadPath');
+      final extNotifier = ref.read(extensionProvider.notifier);
+      final success = await extNotifier.upgradeExtension(downloadPath);
+
+      if (success) {
+        _log.i('Extension updated: $extensionId');
+        await refresh();
+      }
+
+      state = state.copyWith(isDownloading: false, clearDownloadingId: true);
+      return success;
+    } catch (e) {
+      _log.e('Failed to update extension: $e');
+      state = state.copyWith(isDownloading: false, clearDownloadingId: true, error: e.toString());
+      return false;
+    }
+  }
+
+  /// Clear error
+  void clearError() {
+    state = state.copyWith(clearError: true);
+  }
+}
+
+final storeProvider = NotifierProvider<StoreNotifier, StoreState>(
+  StoreNotifier.new,
+);
@@ -1,6 +1,11 @@
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:spotiflac_android/models/track.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
+import 'package:spotiflac_android/utils/logger.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+
+final _log = AppLogger('TrackProvider');

 class TrackState {
  final List<Track> tracks;
@@ -15,6 +20,7 @@ class TrackState {
  final List<ArtistAlbum>? artistAlbums; // For artist page
  final List<SearchArtist>? searchArtists; // For search results
  final bool hasSearchText; // For back button handling
+  final String? searchExtensionId; // Extension ID used for current search results

  const TrackState({
    this.tracks = const [],
@@ -29,6 +35,7 @@ class TrackState {
    this.artistAlbums,
    this.searchArtists,
    this.hasSearchText = false,
+    this.searchExtensionId,
  });

  bool get hasContent => tracks.isNotEmpty || artistAlbums != null || (searchArtists != null && searchArtists!.isNotEmpty);
@@ -46,6 +53,7 @@ class TrackState {
    List<ArtistAlbum>? artistAlbums,
    List<SearchArtist>? searchArtists,
    bool? hasSearchText,
+    String? searchExtensionId,
  }) {
    return TrackState(
      tracks: tracks ?? this.tracks,
@@ -60,6 +68,7 @@ class TrackState {
      artistAlbums: artistAlbums ?? this.artistAlbums,
      searchArtists: searchArtists ?? this.searchArtists,
      hasSearchText: hasSearchText ?? this.hasSearchText,
+      searchExtensionId: searchExtensionId,
    );
  }
 }
@@ -122,6 +131,59 @@ class TrackNotifier extends Notifier<TrackState> {
    state = TrackState(isLoading: true, hasSearchText: state.hasSearchText);

    try {
+      // First, check if any extension can handle this URL
+      final extensionHandler = await PlatformBridge.findURLHandler(url);
+      if (extensionHandler != null) {
+        _log.i('Found extension URL handler: $extensionHandler for URL: $url');
+        final result = await PlatformBridge.handleURLWithExtension(url);
+        if (!_isRequestValid(requestId)) return;
+        
+        if (result != null) {
+          final type = result['type'] as String?;
+          final extensionId = result['extension_id'] as String?;
+          
+          if (type == 'track' && result['track'] != null) {
+            final trackData = result['track'] as Map<String, dynamic>;
+            final track = _parseSearchTrack(trackData, source: extensionId);
+            state = TrackState(
+              tracks: [track],
+              isLoading: false,
+              coverUrl: track.coverUrl,
+              searchExtensionId: extensionId,
+            );
+            return;
+          } else if ((type == 'album' || type == 'playlist') && result['tracks'] != null) {
+            final trackList = result['tracks'] as List<dynamic>;
+            final tracks = trackList.map((t) => _parseSearchTrack(t as Map<String, dynamic>, source: extensionId)).toList();
+            state = TrackState(
+              tracks: tracks,
+              isLoading: false,
+              albumId: result['album']?['id'] as String?,
+              albumName: result['name'] as String? ?? result['album']?['name'] as String?,
+              playlistName: type == 'playlist' ? result['name'] as String? : null,
+              coverUrl: result['cover_url'] as String?,
+              searchExtensionId: extensionId,
+            );
+            return;
+          } else if (type == 'artist' && result['artist'] != null) {
+            final artistData = result['artist'] as Map<String, dynamic>;
+            final albumsList = artistData['albums'] as List<dynamic>? ?? [];
+            final albums = albumsList.map((a) => _parseArtistAlbum(a as Map<String, dynamic>)).toList();
+            state = TrackState(
+              tracks: [],
+              isLoading: false,
+              artistId: artistData['id'] as String?,
+              artistName: artistData['name'] as String?,
+              coverUrl: artistData['image_url'] as String? ?? artistData['images'] as String?,
+              artistAlbums: albums,
+              searchExtensionId: extensionId,
+            );
+            return;
+          }
+        }
+      }
+      
+      // No extension handler found, try Spotify URL parsing
      final parsed = await PlatformBridge.parseSpotifyUrl(url);
      if (!_isRequestValid(requestId)) return; // Request cancelled
      
@@ -207,31 +269,109 @@ class TrackNotifier extends Notifier<TrackState> {
    state = TrackState(isLoading: true, hasSearchText: state.hasSearchText);

    try {
+      // Check if extension providers should be used for search
+      final settings = ref.read(settingsProvider);
+      final extensionState = ref.read(extensionProvider);
+      final hasActiveMetadataExtensions = extensionState.extensions.any(
+        (e) => e.enabled && e.hasMetadataProvider,
+      );
+      final useExtensions = settings.useExtensionProviders && hasActiveMetadataExtensions;
+
      // Use Deezer or Spotify based on settings
      final source = metadataSource ?? 'deezer';
      
-      // Debug log to show which source is being used
-      // ignore: avoid_print
-      print('[Search] Using metadata source: $source for query: "$query"');
+      _log.i('Search started: source=$source, query="$query", useExtensions=$useExtensions');
      
      Map<String, dynamic> results;
-      if (source == 'deezer') {
-        results = await PlatformBridge.searchDeezerAll(query, trackLimit: 20, artistLimit: 5);
-        // ignore: avoid_print
-        print('[Search] Deezer returned ${(results['tracks'] as List?)?.length ?? 0} tracks');
-      } else {
-        results = await PlatformBridge.searchSpotifyAll(query, trackLimit: 20, artistLimit: 5);
-        // ignore: avoid_print
-        print('[Search] Spotify returned ${(results['tracks'] as List?)?.length ?? 0} tracks');
+      List<Track> extensionTracks = [];
+      
+      // Try extension providers first if enabled
+      if (useExtensions) {
+        try {
+          _log.d('Calling extension search API...');
+          final extResults = await PlatformBridge.searchTracksWithExtensions(query, limit: 20);
+          _log.i('Extensions returned ${extResults.length} tracks');
+          
+          // Parse extension results
+          for (final t in extResults) {
+            try {
+              extensionTracks.add(_parseSearchTrack(t));
+            } catch (e) {
+              _log.e('Failed to parse extension track: $e', e);
+            }
+          }
+        } catch (e) {
+          _log.w('Extension search failed, falling back to built-in: $e');
+        }
      }
      
-      if (!_isRequestValid(requestId)) return; // Request cancelled
+      // Also search with built-in providers
+      if (source == 'deezer') {
+        _log.d('Calling Deezer search API...');
+        results = await PlatformBridge.searchDeezerAll(query, trackLimit: 20, artistLimit: 5);
+        _log.i('Deezer returned ${(results['tracks'] as List?)?.length ?? 0} tracks, ${(results['artists'] as List?)?.length ?? 0} artists');
+      } else {
+        _log.d('Calling Spotify search API...');
+        results = await PlatformBridge.searchSpotifyAll(query, trackLimit: 20, artistLimit: 5);
+        _log.i('Spotify returned ${(results['tracks'] as List?)?.length ?? 0} tracks, ${(results['artists'] as List?)?.length ?? 0} artists');
+      }
+      
+      if (!_isRequestValid(requestId)) {
+        _log.w('Search request cancelled (requestId=$requestId)');
+        return;
+      }
      
      final trackList = results['tracks'] as List<dynamic>? ?? [];
      final artistList = results['artists'] as List<dynamic>? ?? [];
      
-      final tracks = trackList.map((t) => _parseSearchTrack(t as Map<String, dynamic>)).toList();
-      final artists = artistList.map((a) => _parseSearchArtist(a as Map<String, dynamic>)).toList();
+      _log.d('Raw results: ${trackList.length} tracks, ${artistList.length} artists');
+      
+      // Parse tracks with error handling per item
+      final tracks = <Track>[];
+      
+      // Add extension tracks first (they have priority)
+      tracks.addAll(extensionTracks);
+      
+      // Add built-in provider tracks, avoiding duplicates by ISRC
+      final existingIsrcs = extensionTracks
+          .where((t) => t.isrc != null && t.isrc!.isNotEmpty)
+          .map((t) => t.isrc!)
+          .toSet();
+      
+      for (int i = 0; i < trackList.length; i++) {
+        final t = trackList[i];
+        try {
+          if (t is Map<String, dynamic>) {
+            final track = _parseSearchTrack(t);
+            // Skip if we already have this track from extensions
+            if (track.isrc != null && existingIsrcs.contains(track.isrc)) {
+              continue;
+            }
+            tracks.add(track);
+          } else {
+            _log.w('Track[$i] is not a Map: ${t.runtimeType}');
+          }
+        } catch (e) {
+          _log.e('Failed to parse track[$i]: $e', e);
+        }
+      }
+      
+      // Parse artists with error handling per item
+      final artists = <SearchArtist>[];
+      for (int i = 0; i < artistList.length; i++) {
+        final a = artistList[i];
+        try {
+          if (a is Map<String, dynamic>) {
+            artists.add(_parseSearchArtist(a));
+          } else {
+            _log.w('Artist[$i] is not a Map: ${a.runtimeType}');
+          }
+        } catch (e) {
+          _log.e('Failed to parse artist[$i]: $e', e);
+        }
+      }
+      
+      _log.i('Search complete: ${tracks.length} tracks (${extensionTracks.length} from extensions), ${artists.length} artists parsed successfully');
      
      state = TrackState(
        tracks: tracks,
@@ -239,9 +379,56 @@ class TrackNotifier extends Notifier<TrackState> {
        isLoading: false,
        hasSearchText: state.hasSearchText,
      );
-    } catch (e) {
-      if (!_isRequestValid(requestId)) return; // Request cancelled
-      // Preserve hasSearchText on error so user stays on search screen
+    } catch (e, stackTrace) {
+      if (!_isRequestValid(requestId)) return;
+      _log.e('Search failed: $e', e, stackTrace);
+      state = TrackState(isLoading: false, error: e.toString(), hasSearchText: state.hasSearchText);
+    }
+  }
+
+  /// Perform custom search using a specific extension
+  Future<void> customSearch(String extensionId, String query, {Map<String, dynamic>? options}) async {
+    // Increment request ID to cancel any pending requests
+    final requestId = ++_currentRequestId;
+
+    // Preserve hasSearchText during search
+    state = TrackState(isLoading: true, hasSearchText: state.hasSearchText);
+
+    try {
+      _log.i('Custom search started: extension=$extensionId, query="$query"');
+      
+      final results = await PlatformBridge.customSearchWithExtension(extensionId, query, options: options);
+      
+      if (!_isRequestValid(requestId)) {
+        _log.w('Custom search request cancelled (requestId=$requestId)');
+        return;
+      }
+      
+      _log.i('Custom search returned ${results.length} tracks');
+      
+      // Parse tracks with error handling per item, setting source to extension ID
+      final tracks = <Track>[];
+      for (int i = 0; i < results.length; i++) {
+        final t = results[i];
+        try {
+          tracks.add(_parseSearchTrack(t, source: extensionId));
+        } catch (e) {
+          _log.e('Failed to parse custom search track[$i]: $e', e);
+        }
+      }
+      
+      _log.i('Custom search complete: ${tracks.length} tracks parsed (source=$extensionId)');
+      
+      state = TrackState(
+        tracks: tracks,
+        searchArtists: [], // Custom search doesn't return artists
+        isLoading: false,
+        hasSearchText: state.hasSearchText,
+        searchExtensionId: extensionId, // Store which extension was used
+      );
+    } catch (e, stackTrace) {
+      if (!_isRequestValid(requestId)) return;
+      _log.e('Custom search failed: $e', e, stackTrace);
      state = TrackState(isLoading: false, error: e.toString(), hasSearchText: state.hasSearchText);
    }
  }
@@ -309,19 +496,30 @@ class TrackNotifier extends Notifier<TrackState> {
    );
  }

-  Track _parseSearchTrack(Map<String, dynamic> data) {
+  Track _parseSearchTrack(Map<String, dynamic> data, {String? source}) {
+    // Handle duration_ms which might be int or double
+    int durationMs = 0;
+    final durationValue = data['duration_ms'];
+    if (durationValue is int) {
+      durationMs = durationValue;
+    } else if (durationValue is double) {
+      durationMs = durationValue.toInt();
+    }
+    
    return Track(
-      id: data['spotify_id'] as String? ?? '',
-      name: data['name'] as String? ?? '',
-      artistName: data['artists'] as String? ?? '',
-      albumName: data['album_name'] as String? ?? '',
-      albumArtist: data['album_artist'] as String?,
-      coverUrl: data['images'] as String?,
-      isrc: data['isrc'] as String?,
-      duration: ((data['duration_ms'] as int? ?? 0) / 1000).round(),
+      id: (data['spotify_id'] ?? data['id'] ?? '').toString(),
+      name: (data['name'] ?? '').toString(),
+      artistName: (data['artists'] ?? data['artist'] ?? '').toString(),
+      albumName: (data['album_name'] ?? data['album'] ?? '').toString(),
+      albumArtist: data['album_artist']?.toString(),
+      coverUrl: data['images']?.toString(),
+      isrc: data['isrc']?.toString(),
+      duration: (durationMs / 1000).round(),
      trackNumber: data['track_number'] as int?,
      discNumber: data['disc_number'] as int?,
-      releaseDate: data['release_date'] as String?,
+      releaseDate: data['release_date']?.toString(),
+      source: source ?? data['source']?.toString() ?? data['provider_id']?.toString(),
+      albumType: data['album_type']?.toString(),
    );
  }

@@ -7,6 +7,7 @@ import 'package:spotiflac_android/models/download_item.dart';
 import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
+import 'package:spotiflac_android/widgets/download_service_picker.dart';

 /// Simple in-memory cache for album tracks
 class _AlbumCache {
@@ -316,10 +317,16 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
  void _downloadTrack(BuildContext context, Track track) {
    final settings = ref.read(settingsProvider);
    if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, (quality, service) {
-        ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
-      }, trackName: track.name, artistName: track.artistName, coverUrl: track.coverUrl);
+      DownloadServicePicker.show(
+        context,
+        trackName: track.name,
+        artistName: track.artistName,
+        coverUrl: track.coverUrl,
+        onSelect: (quality, service) {
+          ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
+          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
+        },
+      );
    } else {
      ref.read(downloadQueueProvider.notifier).addToQueue(track, settings.defaultService);
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
@@ -331,84 +338,21 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
    if (tracks == null || tracks.isEmpty) return;
    final settings = ref.read(settingsProvider);
    if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, (quality, service) {
-        ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, service, qualityOverride: quality);
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
-      }, trackName: '${tracks.length} tracks', artistName: widget.albumName);
+      DownloadServicePicker.show(
+        context,
+        trackName: '${tracks.length} tracks',
+        artistName: widget.albumName,
+        onSelect: (quality, service) {
+          ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, service, qualityOverride: quality);
+          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
+        },
+      );
    } else {
      ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, settings.defaultService);
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
    }
  }

-  void _showQualityPicker(BuildContext context, void Function(String quality, String service) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
-    final colorScheme = Theme.of(context).colorScheme;
-    final settings = ref.read(settingsProvider);
-    String selectedService = settings.defaultService;
-    
-    showModalBottomSheet(
-      context: context,
-      backgroundColor: colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
-      isScrollControlled: true,
-      builder: (context) => StatefulBuilder(
-        builder: (context, setModalState) => SafeArea(
-          child: SingleChildScrollView(
-            child: Column(
-              mainAxisSize: MainAxisSize.min,
-              crossAxisAlignment: CrossAxisAlignment.start,
-              children: [
-                if (trackName != null) ...[
-                  _TrackInfoHeader(trackName: trackName, artistName: artistName, coverUrl: coverUrl),
-                  Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-                ] else ...[
-                  const SizedBox(height: 8),
-                  Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
-                ],
-                // Service selector
-                Padding(
-                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-                  child: Text('Download From', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
-                ),
-                Padding(
-                  padding: const EdgeInsets.symmetric(horizontal: 20),
-                  child: Row(
-                    children: [
-                      _ServiceChip(label: 'Tidal', isSelected: selectedService == 'tidal', onTap: () => setModalState(() => selectedService = 'tidal')),
-                      const SizedBox(width: 8),
-                      _ServiceChip(label: 'Qobuz', isSelected: selectedService == 'qobuz', onTap: () => setModalState(() => selectedService = 'qobuz')),
-                      const SizedBox(width: 8),
-                      _ServiceChip(label: 'Amazon', isSelected: selectedService == 'amazon', onTap: () => setModalState(() => selectedService = 'amazon')),
-                    ],
-                  ),
-                ),
-                Padding(
-                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-                  child: Text('Select Quality', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
-                ),
-                // Disclaimer
-                Padding(
-                  padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
-                  child: Text(
-                    'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
-                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                      color: colorScheme.onSurfaceVariant,
-                      fontStyle: FontStyle.italic,
-                    ),
-                  ),
-                ),
-                _QualityOption(title: 'FLAC Lossless', subtitle: '16-bit / 44.1kHz', icon: Icons.music_note, onTap: () { Navigator.pop(context); onSelect('LOSSLESS', selectedService); }),
-                _QualityOption(title: 'Hi-Res FLAC', subtitle: '24-bit / up to 96kHz', icon: Icons.high_quality, onTap: () { Navigator.pop(context); onSelect('HI_RES', selectedService); }),
-                _QualityOption(title: 'Hi-Res FLAC Max', subtitle: '24-bit / up to 192kHz', icon: Icons.four_k, onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS', selectedService); }),
-                const SizedBox(height: 16),
-              ],
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-
  /// Build error widget with special handling for rate limit (429)
  Widget _buildErrorWidget(String error, ColorScheme colorScheme) {
    final isRateLimit = error.contains('429') || 
@@ -473,148 +417,6 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
  }
 }

-class _QualityOption extends StatelessWidget {
-  final String title;
-  final String subtitle;
-  final IconData icon;
-  final VoidCallback onTap;
-
-  const _QualityOption({required this.title, required this.subtitle, required this.icon, required this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return ListTile(
-      contentPadding: const EdgeInsets.symmetric(horizontal: 24, vertical: 4),
-      leading: Container(padding: const EdgeInsets.all(10), decoration: BoxDecoration(color: colorScheme.primaryContainer, borderRadius: BorderRadius.circular(12)), child: Icon(icon, color: colorScheme.onPrimaryContainer, size: 20)),
-      title: Text(title, style: const TextStyle(fontWeight: FontWeight.w500)),
-      subtitle: Text(subtitle, style: TextStyle(color: colorScheme.onSurfaceVariant)),
-      onTap: onTap,
-    );
-  }
-}
-
-class _ServiceChip extends StatelessWidget {
-  final String label;
-  final bool isSelected;
-  final VoidCallback onTap;
-  const _ServiceChip({required this.label, required this.isSelected, required this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Expanded(
-      child: GestureDetector(
-        onTap: onTap,
-        child: AnimatedContainer(
-          duration: const Duration(milliseconds: 200),
-          padding: const EdgeInsets.symmetric(vertical: 10),
-          decoration: BoxDecoration(
-            color: isSelected ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
-            borderRadius: BorderRadius.circular(12),
-            border: isSelected ? null : Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-          ),
-          child: Text(
-            label,
-            textAlign: TextAlign.center,
-            style: TextStyle(
-              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
-              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-}
-
-class _TrackInfoHeader extends StatefulWidget {
-  final String trackName;
-  final String? artistName;
-  final String? coverUrl;
-  const _TrackInfoHeader({required this.trackName, this.artistName, this.coverUrl});
-
-  @override
-  State<_TrackInfoHeader> createState() => _TrackInfoHeaderState();
-}
-
-class _TrackInfoHeaderState extends State<_TrackInfoHeader> {
-  bool _expanded = false;
-  bool _isOverflowing = false;
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Material(
-      color: Colors.transparent,
-      child: InkWell(
-        onTap: _isOverflowing ? () => setState(() => _expanded = !_expanded) : null,
-        borderRadius: const BorderRadius.only(topLeft: Radius.circular(28), topRight: Radius.circular(28)),
-        child: Column(
-          children: [
-            const SizedBox(height: 8),
-            Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2))),
-            Padding(
-              padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
-              child: Row(
-                children: [
-                  ClipRRect(
-                    borderRadius: BorderRadius.circular(8),
-                    child: widget.coverUrl != null
-                        ? Image.network(widget.coverUrl!, width: 56, height: 56, fit: BoxFit.cover,
-                            errorBuilder: (_, e, s) => Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)))
-                        : Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)),
-                  ),
-                  const SizedBox(width: 12),
-                  Expanded(
-                    child: LayoutBuilder(
-                      builder: (context, constraints) {
-                        final titleStyle = Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600);
-                        final titleSpan = TextSpan(text: widget.trackName, style: titleStyle);
-                        final titlePainter = TextPainter(text: titleSpan, maxLines: 1, textDirection: TextDirection.ltr)..layout(maxWidth: constraints.maxWidth);
-                        final titleOverflows = titlePainter.didExceedMaxLines;
-                        
-                        WidgetsBinding.instance.addPostFrameCallback((_) {
-                          if (mounted && _isOverflowing != titleOverflows) {
-                            setState(() => _isOverflowing = titleOverflows);
-                          }
-                        });
-                        
-                        return Column(
-                          crossAxisAlignment: CrossAxisAlignment.start,
-                          children: [
-                            Text(
-                              widget.trackName,
-                              style: titleStyle,
-                              maxLines: _expanded ? 10 : 1,
-                              overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
-                            ),
-                            if (widget.artistName != null) ...[
-                              const SizedBox(height: 2),
-                              Text(
-                                widget.artistName!,
-                                style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
-                                maxLines: _expanded ? 3 : 1,
-                                overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
-                              ),
-                            ],
-                          ],
-                        );
-                      },
-                    ),
-                  ),
-                  if (_isOverflowing || _expanded)
-                    Icon(_expanded ? Icons.expand_less : Icons.expand_more, color: colorScheme.onSurfaceVariant, size: 20),
-                ],
-              ),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
-
 /// Separate Consumer widget for each track - only rebuilds when this specific track's status changes
 class _AlbumTrackItem extends ConsumerWidget {
  final Track track;
@@ -159,6 +159,11 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
  }

  Widget _buildAppBar(BuildContext context, ColorScheme colorScheme) {
+    // Validate image URL - must be non-null, non-empty, and have a valid host
+    final hasValidImage = widget.coverUrl != null && 
+                          widget.coverUrl!.isNotEmpty &&
+                          Uri.tryParse(widget.coverUrl!)?.hasAuthority == true;
+    
    return SliverAppBar(
      expandedHeight: 280,
      pinned: true,
@@ -169,8 +174,15 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
        background: Stack(
          fit: StackFit.expand,
          children: [
-            if (widget.coverUrl != null)
-              CachedNetworkImage(imageUrl: widget.coverUrl!, fit: BoxFit.cover, color: Colors.black.withValues(alpha: 0.5), colorBlendMode: BlendMode.darken, memCacheWidth: 600),
+            if (hasValidImage)
+              CachedNetworkImage(
+                imageUrl: widget.coverUrl!, 
+                fit: BoxFit.cover, 
+                color: Colors.black.withValues(alpha: 0.5), 
+                colorBlendMode: BlendMode.darken, 
+                memCacheWidth: 600,
+                errorWidget: (context, url, error) => Container(color: colorScheme.surfaceContainerHighest),
+              ),
            Container(
              decoration: BoxDecoration(
                gradient: LinearGradient(
@@ -192,8 +204,16 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
                    boxShadow: [BoxShadow(color: Colors.black.withValues(alpha: 0.3), blurRadius: 20, offset: const Offset(0, 10))],
                  ),
                  child: ClipOval(
-                    child: widget.coverUrl != null
-                        ? CachedNetworkImage(imageUrl: widget.coverUrl!, fit: BoxFit.cover, memCacheWidth: 280)
+                    child: hasValidImage
+                        ? CachedNetworkImage(
+                            imageUrl: widget.coverUrl!, 
+                            fit: BoxFit.cover, 
+                            memCacheWidth: 280,
+                            errorWidget: (context, url, error) => Container(
+                              color: colorScheme.surfaceContainerHighest, 
+                              child: Icon(Icons.person, size: 48, color: colorScheme.onSurfaceVariant),
+                            ),
+                          )
                        : Container(color: colorScheme.surfaceContainerHighest, child: Icon(Icons.person, size: 48, color: colorScheme.onSurfaceVariant)),
                  ),
                ),
@@ -0,0 +1,573 @@
+import 'dart:io';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:cached_network_image/cached_network_image.dart';
+import 'package:open_filex/open_filex.dart';
+import 'package:spotiflac_android/providers/download_queue_provider.dart';
+import 'package:spotiflac_android/screens/track_metadata_screen.dart';
+
+/// Screen to display downloaded tracks from a specific album
+class DownloadedAlbumScreen extends ConsumerStatefulWidget {
+  final String albumName;
+  final String artistName;
+  final String? coverUrl;
+
+  const DownloadedAlbumScreen({
+    super.key,
+    required this.albumName,
+    required this.artistName,
+    this.coverUrl,
+  });
+
+  @override
+  ConsumerState<DownloadedAlbumScreen> createState() => _DownloadedAlbumScreenState();
+}
+
+class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
+  // Multi-select state
+  bool _isSelectionMode = false;
+  final Set<String> _selectedIds = {};
+
+  /// Get tracks for this album from history provider (reactive)
+  List<DownloadHistoryItem> _getAlbumTracks(List<DownloadHistoryItem> allItems) {
+    return allItems.where((item) {
+      final itemKey = '${item.albumName}|${item.albumArtist ?? item.artistName}';
+      final albumKey = '${widget.albumName}|${widget.artistName}';
+      return itemKey == albumKey;
+    }).toList()
+      ..sort((a, b) {
+        final aNum = a.trackNumber ?? 999;
+        final bNum = b.trackNumber ?? 999;
+        if (aNum != bNum) return aNum.compareTo(bNum);
+        return a.trackName.compareTo(b.trackName);
+      });
+  }
+
+  void _enterSelectionMode(String itemId) {
+    HapticFeedback.mediumImpact();
+    setState(() {
+      _isSelectionMode = true;
+      _selectedIds.add(itemId);
+    });
+  }
+
+  void _exitSelectionMode() {
+    setState(() {
+      _isSelectionMode = false;
+      _selectedIds.clear();
+    });
+  }
+
+  void _toggleSelection(String itemId) {
+    setState(() {
+      if (_selectedIds.contains(itemId)) {
+        _selectedIds.remove(itemId);
+        if (_selectedIds.isEmpty) {
+          _isSelectionMode = false;
+        }
+      } else {
+        _selectedIds.add(itemId);
+      }
+    });
+  }
+
+  void _selectAll(List<DownloadHistoryItem> tracks) {
+    setState(() {
+      _selectedIds.addAll(tracks.map((e) => e.id));
+    });
+  }
+
+  Future<void> _deleteSelected(List<DownloadHistoryItem> currentTracks) async {
+    final count = _selectedIds.length;
+    final confirmed = await showDialog<bool>(
+      context: context,
+      builder: (ctx) => AlertDialog(
+        title: const Text('Delete Selected'),
+        content: Text('Delete $count ${count == 1 ? 'track' : 'tracks'} from this album?\n\nThis will also delete the files from storage.'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(ctx, false),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.pop(ctx, true),
+            style: FilledButton.styleFrom(
+              backgroundColor: Theme.of(context).colorScheme.error,
+            ),
+            child: const Text('Delete'),
+          ),
+        ],
+      ),
+    );
+
+    if (confirmed == true && mounted) {
+      final historyNotifier = ref.read(downloadHistoryProvider.notifier);
+      final idsToDelete = _selectedIds.toList();
+      
+      int deletedCount = 0;
+      for (final id in idsToDelete) {
+        final item = currentTracks.where((e) => e.id == id).firstOrNull;
+        if (item != null) {
+          try {
+            final file = File(item.filePath);
+            if (await file.exists()) {
+              await file.delete();
+            }
+          } catch (_) {}
+          historyNotifier.removeFromHistory(id);
+          deletedCount++;
+        }
+      }
+      
+      _exitSelectionMode();
+      
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(content: Text('Deleted $deletedCount ${deletedCount == 1 ? 'track' : 'tracks'}')),
+        );
+      }
+    }
+  }
+
+  Future<void> _openFile(String filePath) async {
+    try {
+      await OpenFilex.open(filePath);
+    } catch (e) {
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(content: Text('Cannot open file: $e')),
+        );
+      }
+    }
+  }
+
+  void _navigateToMetadataScreen(DownloadHistoryItem item) {
+    Navigator.push(context, PageRouteBuilder(
+      transitionDuration: const Duration(milliseconds: 300),
+      reverseTransitionDuration: const Duration(milliseconds: 250),
+      pageBuilder: (context, animation, secondaryAnimation) => TrackMetadataScreen(item: item),
+      transitionsBuilder: (context, animation, secondaryAnimation, child) => FadeTransition(opacity: animation, child: child),
+    ));
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final bottomPadding = MediaQuery.of(context).padding.bottom;
+    
+    // Watch history and get tracks for this album (reactive!)
+    final allHistoryItems = ref.watch(downloadHistoryProvider.select((s) => s.items));
+    final tracks = _getAlbumTracks(allHistoryItems);
+    
+    // Auto-pop if album has less than 2 tracks (no longer an "album")
+    if (tracks.length < 2) {
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        if (mounted) Navigator.pop(context);
+      });
+      return const SizedBox.shrink();
+    }
+    
+    // Clean up selected IDs that no longer exist
+    final validIds = tracks.map((t) => t.id).toSet();
+    _selectedIds.removeWhere((id) => !validIds.contains(id));
+    if (_selectedIds.isEmpty && _isSelectionMode) {
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        if (mounted) setState(() => _isSelectionMode = false);
+      });
+    }
+
+    return PopScope(
+      canPop: !_isSelectionMode,
+      onPopInvokedWithResult: (didPop, result) {
+        if (!didPop && _isSelectionMode) {
+          _exitSelectionMode();
+        }
+      },
+      child: Scaffold(
+        body: Stack(
+          children: [
+            CustomScrollView(
+              slivers: [
+                _buildAppBar(context, colorScheme),
+                _buildInfoCard(context, colorScheme, tracks),
+                _buildTrackListHeader(context, colorScheme, tracks),
+                _buildTrackList(context, colorScheme, tracks),
+                SliverToBoxAdapter(child: SizedBox(height: _isSelectionMode ? 120 : 32)),
+              ],
+            ),
+            
+            // Bottom Selection Action Bar
+            AnimatedPositioned(
+              duration: const Duration(milliseconds: 250),
+              curve: Curves.easeOutCubic,
+              left: 0,
+              right: 0,
+              bottom: _isSelectionMode ? 0 : -(200 + bottomPadding),
+              child: _buildSelectionBottomBar(context, colorScheme, tracks, bottomPadding),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildAppBar(BuildContext context, ColorScheme colorScheme) {
+    return SliverAppBar(
+      expandedHeight: 280,
+      pinned: true,
+      stretch: true,
+      backgroundColor: colorScheme.surface,
+      surfaceTintColor: Colors.transparent,
+      flexibleSpace: FlexibleSpaceBar(
+        background: Stack(
+          fit: StackFit.expand,
+          children: [
+            if (widget.coverUrl != null)
+              CachedNetworkImage(
+                imageUrl: widget.coverUrl!,
+                fit: BoxFit.cover,
+                color: Colors.black.withValues(alpha: 0.5),
+                colorBlendMode: BlendMode.darken,
+                memCacheWidth: 600,
+              ),
+            Container(
+              decoration: BoxDecoration(
+                gradient: LinearGradient(
+                  begin: Alignment.topCenter,
+                  end: Alignment.bottomCenter,
+                  colors: [
+                    Colors.transparent,
+                    colorScheme.surface.withValues(alpha: 0.8),
+                    colorScheme.surface,
+                  ],
+                  stops: const [0.0, 0.7, 1.0],
+                ),
+              ),
+            ),
+            Center(
+              child: Padding(
+                padding: const EdgeInsets.only(top: 60),
+                child: Container(
+                  width: 140,
+                  height: 140,
+                  decoration: BoxDecoration(
+                    borderRadius: BorderRadius.circular(16),
+                    boxShadow: [
+                      BoxShadow(
+                        color: Colors.black.withValues(alpha: 0.3),
+                        blurRadius: 20,
+                        offset: const Offset(0, 10),
+                      ),
+                    ],
+                  ),
+                  child: ClipRRect(
+                    borderRadius: BorderRadius.circular(16),
+                    child: widget.coverUrl != null
+                        ? CachedNetworkImage(imageUrl: widget.coverUrl!, fit: BoxFit.cover, memCacheWidth: 280)
+                        : Container(
+                            color: colorScheme.surfaceContainerHighest,
+                            child: Icon(Icons.album, size: 48, color: colorScheme.onSurfaceVariant),
+                          ),
+                  ),
+                ),
+              ),
+            ),
+          ],
+        ),
+        stretchModes: const [StretchMode.zoomBackground, StretchMode.blurBackground],
+      ),
+      leading: IconButton(
+        icon: Container(
+          padding: const EdgeInsets.all(8),
+          decoration: BoxDecoration(color: colorScheme.surface.withValues(alpha: 0.8), shape: BoxShape.circle),
+          child: Icon(Icons.arrow_back, color: colorScheme.onSurface),
+        ),
+        onPressed: () => Navigator.pop(context),
+      ),
+    );
+  }
+
+  Widget _buildInfoCard(BuildContext context, ColorScheme colorScheme, List<DownloadHistoryItem> tracks) {
+    return SliverToBoxAdapter(
+      child: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Card(
+          elevation: 0,
+          color: colorScheme.surfaceContainerLow,
+          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+          child: Padding(
+            padding: const EdgeInsets.all(20),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text(
+                  widget.albumName,
+                  style: Theme.of(context).textTheme.headlineSmall?.copyWith(fontWeight: FontWeight.bold, color: colorScheme.onSurface),
+                ),
+                const SizedBox(height: 4),
+                Text(
+                  widget.artistName,
+                  style: Theme.of(context).textTheme.bodyLarge?.copyWith(color: colorScheme.onSurfaceVariant),
+                ),
+                const SizedBox(height: 12),
+                Row(
+                  children: [
+                    Container(
+                      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
+                      decoration: BoxDecoration(color: colorScheme.primaryContainer, borderRadius: BorderRadius.circular(20)),
+                      child: Row(
+                        mainAxisSize: MainAxisSize.min,
+                        children: [
+                          Icon(Icons.download_done, size: 14, color: colorScheme.onPrimaryContainer),
+                          const SizedBox(width: 4),
+                          Text('${tracks.length} downloaded', style: TextStyle(color: colorScheme.onPrimaryContainer, fontWeight: FontWeight.w600, fontSize: 12)),
+                        ],
+                      ),
+                    ),
+                    const SizedBox(width: 8),
+                    if (_getCommonQuality(tracks) != null)
+                      Container(
+                        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
+                        decoration: BoxDecoration(
+                          color: _getCommonQuality(tracks)!.startsWith('24') 
+                              ? colorScheme.tertiaryContainer 
+                              : colorScheme.surfaceContainerHighest,
+                          borderRadius: BorderRadius.circular(20),
+                        ),
+                        child: Text(
+                          _getCommonQuality(tracks)!,
+                          style: TextStyle(
+                            color: _getCommonQuality(tracks)!.startsWith('24') 
+                                ? colorScheme.onTertiaryContainer 
+                                : colorScheme.onSurfaceVariant,
+                            fontWeight: FontWeight.w600,
+                            fontSize: 12,
+                          ),
+                        ),
+                      ),
+                  ],
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  String? _getCommonQuality(List<DownloadHistoryItem> tracks) {
+    if (tracks.isEmpty) return null;
+    final firstQuality = tracks.first.quality;
+    if (firstQuality == null) return null;
+    for (final track in tracks) {
+      if (track.quality != firstQuality) return null;
+    }
+    return firstQuality;
+  }
+
+  Widget _buildTrackListHeader(BuildContext context, ColorScheme colorScheme, List<DownloadHistoryItem> tracks) {
+    return SliverToBoxAdapter(
+      child: Padding(
+        padding: const EdgeInsets.fromLTRB(20, 8, 20, 8),
+        child: Row(
+          children: [
+            Icon(Icons.queue_music, size: 20, color: colorScheme.primary),
+            const SizedBox(width: 8),
+            Text('Tracks', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600, color: colorScheme.onSurface)),
+            const Spacer(),
+            if (!_isSelectionMode)
+              TextButton.icon(
+                onPressed: tracks.isNotEmpty ? () => _enterSelectionMode(tracks.first.id) : null,
+                icon: const Icon(Icons.checklist, size: 18),
+                label: const Text('Select'),
+                style: TextButton.styleFrom(visualDensity: VisualDensity.compact),
+              ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildTrackList(BuildContext context, ColorScheme colorScheme, List<DownloadHistoryItem> tracks) {
+    return SliverList(
+      delegate: SliverChildBuilderDelegate(
+        (context, index) {
+          final track = tracks[index];
+          return KeyedSubtree(
+            key: ValueKey(track.id),
+            child: _buildTrackItem(context, colorScheme, track),
+          );
+        },
+        childCount: tracks.length,
+      ),
+    );
+  }
+
+  Widget _buildTrackItem(BuildContext context, ColorScheme colorScheme, DownloadHistoryItem track) {
+    final isSelected = _selectedIds.contains(track.id);
+    
+    return Padding(
+      padding: const EdgeInsets.symmetric(horizontal: 8),
+      child: Card(
+        elevation: 0,
+        color: isSelected ? colorScheme.primaryContainer.withValues(alpha: 0.3) : Colors.transparent,
+        margin: const EdgeInsets.symmetric(vertical: 2),
+        child: ListTile(
+          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+          onTap: _isSelectionMode 
+              ? () => _toggleSelection(track.id)
+              : () => _navigateToMetadataScreen(track),
+          onLongPress: _isSelectionMode ? null : () => _enterSelectionMode(track.id),
+          leading: Row(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              if (_isSelectionMode) ...[
+                Container(
+                  width: 24,
+                  height: 24,
+                  decoration: BoxDecoration(
+                    color: isSelected ? colorScheme.primary : Colors.transparent,
+                    shape: BoxShape.circle,
+                    border: Border.all(color: isSelected ? colorScheme.primary : colorScheme.outline, width: 2),
+                  ),
+                  child: isSelected 
+                      ? Icon(Icons.check, color: colorScheme.onPrimary, size: 16)
+                      : null,
+                ),
+                const SizedBox(width: 12),
+              ],
+              SizedBox(
+                width: 24,
+                child: Text(
+                  track.trackNumber?.toString() ?? '-',
+                  style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                    color: colorScheme.onSurfaceVariant,
+                    fontWeight: FontWeight.w500,
+                  ),
+                  textAlign: TextAlign.center,
+                ),
+              ),
+            ],
+          ),
+          title: Text(
+            track.trackName,
+            maxLines: 1,
+            overflow: TextOverflow.ellipsis,
+            style: Theme.of(context).textTheme.bodyLarge?.copyWith(fontWeight: FontWeight.w500),
+          ),
+          subtitle: Text(
+            track.artistName,
+            maxLines: 1,
+            overflow: TextOverflow.ellipsis,
+            style: TextStyle(color: colorScheme.onSurfaceVariant),
+          ),
+          trailing: _isSelectionMode ? null : IconButton(
+            onPressed: () => _openFile(track.filePath),
+            icon: Icon(Icons.play_arrow, color: colorScheme.primary),
+            style: IconButton.styleFrom(
+              backgroundColor: colorScheme.primaryContainer.withValues(alpha: 0.3),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildSelectionBottomBar(BuildContext context, ColorScheme colorScheme, List<DownloadHistoryItem> tracks, double bottomPadding) {
+    final selectedCount = _selectedIds.length;
+    final allSelected = selectedCount == tracks.length && tracks.isNotEmpty;
+    
+    return Container(
+      decoration: BoxDecoration(
+        color: colorScheme.surfaceContainerHigh,
+        borderRadius: const BorderRadius.vertical(top: Radius.circular(28)),
+        boxShadow: [
+          BoxShadow(
+            color: Colors.black.withValues(alpha: 0.15),
+            blurRadius: 12,
+            offset: const Offset(0, -4),
+          ),
+        ],
+      ),
+      child: SafeArea(
+        top: false,
+        child: Padding(
+          padding: EdgeInsets.fromLTRB(16, 16, 16, bottomPadding > 0 ? 8 : 16),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              Container(
+                width: 32,
+                height: 4,
+                margin: const EdgeInsets.only(bottom: 16),
+                decoration: BoxDecoration(
+                  color: colorScheme.outlineVariant,
+                  borderRadius: BorderRadius.circular(2),
+                ),
+              ),
+              Row(
+                children: [
+                  IconButton.filledTonal(
+                    onPressed: _exitSelectionMode,
+                    icon: const Icon(Icons.close),
+                    style: IconButton.styleFrom(
+                      backgroundColor: colorScheme.surfaceContainerHighest,
+                    ),
+                  ),
+                  const SizedBox(width: 12),
+                  Expanded(
+                    child: Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: [
+                        Text(
+                          '$selectedCount selected',
+                          style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
+                        ),
+                        Text(
+                          allSelected ? 'All tracks selected' : 'Tap tracks to select',
+                          style: Theme.of(context).textTheme.bodySmall?.copyWith(color: colorScheme.onSurfaceVariant),
+                        ),
+                      ],
+                    ),
+                  ),
+                  TextButton.icon(
+                    onPressed: () {
+                      if (allSelected) {
+                        _exitSelectionMode();
+                      } else {
+                        _selectAll(tracks);
+                      }
+                    },
+                    icon: Icon(allSelected ? Icons.deselect : Icons.select_all, size: 20),
+                    label: Text(allSelected ? 'Deselect' : 'Select All'),
+                    style: TextButton.styleFrom(foregroundColor: colorScheme.primary),
+                  ),
+                ],
+              ),
+              const SizedBox(height: 16),
+              SizedBox(
+                width: double.infinity,
+                child: FilledButton.icon(
+                  onPressed: selectedCount > 0 ? () => _deleteSelected(tracks) : null,
+                  icon: const Icon(Icons.delete_outline),
+                  label: Text(
+                    selectedCount > 0 
+                        ? 'Delete $selectedCount ${selectedCount == 1 ? 'track' : 'tracks'}'
+                        : 'Select tracks to delete',
+                  ),
+                  style: FilledButton.styleFrom(
+                    backgroundColor: selectedCount > 0 ? colorScheme.error : colorScheme.surfaceContainerHighest,
+                    foregroundColor: selectedCount > 0 ? colorScheme.onError : colorScheme.onSurfaceVariant,
+                    padding: const EdgeInsets.symmetric(vertical: 16),
+                    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+                  ),
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
@@ -8,11 +8,14 @@ import 'package:spotiflac_android/models/track.dart';
 import 'package:spotiflac_android/providers/track_provider.dart';
 import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
 import 'package:spotiflac_android/screens/track_metadata_screen.dart';
 import 'package:spotiflac_android/screens/album_screen.dart';
 import 'package:spotiflac_android/screens/artist_screen.dart';
+import 'package:spotiflac_android/services/csv_import_service.dart';
 import 'package:spotiflac_android/screens/playlist_screen.dart';
 import 'package:spotiflac_android/models/download_item.dart';
+import 'package:spotiflac_android/widgets/download_service_picker.dart';

 class HomeTab extends ConsumerStatefulWidget {
  const HomeTab({super.key});
@@ -77,12 +80,31 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
  }

  Future<void> _performSearch(String query) async {
-    // Skip if same query already searched
-    if (_lastSearchQuery == query) return;
-    _lastSearchQuery = query;
-    
    final settings = ref.read(settingsProvider);
-    await ref.read(trackProvider.notifier).search(query, metadataSource: settings.metadataSource);
+    final extState = ref.read(extensionProvider);
+    final searchProvider = settings.searchProvider;
+    
+    // Skip if same query already searched with same provider
+    final searchKey = '${searchProvider ?? 'default'}:$query';
+    if (_lastSearchQuery == searchKey) return;
+    _lastSearchQuery = searchKey;
+    
+    // Check if extension search provider is set AND still enabled
+    final isExtensionEnabled = searchProvider != null && 
+        searchProvider.isNotEmpty &&
+        extState.extensions.any((e) => e.id == searchProvider && e.enabled);
+    
+    if (isExtensionEnabled) {
+      // Use custom search from extension
+      await ref.read(trackProvider.notifier).customSearch(searchProvider, query);
+    } else {
+      // Use default search (Deezer/Spotify)
+      // Also clear searchProvider if it was set but extension is disabled
+      if (searchProvider != null && searchProvider.isNotEmpty && !isExtensionEnabled) {
+        ref.read(settingsProvider.notifier).setSearchProvider(null);
+      }
+      await ref.read(trackProvider.notifier).search(query, metadataSource: settings.metadataSource);
+    }
    ref.read(settingsProvider.notifier).setHasSearchedBefore();
  }

@@ -172,10 +194,16 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
      final settings = ref.read(settingsProvider);
      
      if (settings.askQualityBeforeDownload) {
-        _showQualityPicker(context, (quality, service) {
-          ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
-          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
-        }, trackName: track.name, artistName: track.artistName, coverUrl: track.coverUrl);
+        DownloadServicePicker.show(
+          context,
+          trackName: track.name,
+          artistName: track.artistName,
+          coverUrl: track.coverUrl,
+          onSelect: (quality, service) {
+            ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
+            ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
+          },
+        );
      } else {
        ref.read(downloadQueueProvider.notifier).addToQueue(track, settings.defaultService);
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
@@ -183,87 +211,103 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
    }
  }

-  void _showQualityPicker(BuildContext context, void Function(String quality, String service) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
-    final colorScheme = Theme.of(context).colorScheme;
-    final settings = ref.read(settingsProvider);
-    String selectedService = settings.defaultService;
+  Future<void> _importCsv(BuildContext context, WidgetRef ref) async {
+    // Show loading dialog with progress
+    int currentProgress = 0;
+    int totalTracks = 0;
    
-    showModalBottomSheet(
-      context: context,
-      backgroundColor: colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
-      isScrollControlled: true,
-      builder: (context) => StatefulBuilder(
-        builder: (context, setModalState) => SafeArea(
-          child: SingleChildScrollView(
-            child: Column(
-              mainAxisSize: MainAxisSize.min,
-              crossAxisAlignment: CrossAxisAlignment.start,
-              children: [
-                if (trackName != null) ...[
-                  _TrackInfoHeader(trackName: trackName, artistName: artistName, coverUrl: coverUrl),
-                  Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-                ] else ...[
-                  const SizedBox(height: 8),
-                  Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
+    // Use StatefulBuilder to update dialog content
+    bool dialogShown = false;
+    StateSetter? setDialogState;
+    
+    void showProgressDialog() {
+      if (dialogShown || !mounted) return;
+      dialogShown = true;
+      showDialog(
+        context: this.context,
+        barrierDismissible: false,
+        builder: (dialogCtx) => StatefulBuilder(
+          builder: (dialogCtx, setState) {
+            setDialogState = setState;
+            return AlertDialog(
+              content: Column(
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  const CircularProgressIndicator(),
+                  const SizedBox(height: 16),
+                  Text(
+                    totalTracks > 0 
+                        ? 'Fetching metadata... $currentProgress/$totalTracks'
+                        : 'Reading CSV...',
+                  ),
                ],
-                // Service selector
-                Padding(
-                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-                  child: Text('Download From', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
-                ),
-                Padding(
-                  padding: const EdgeInsets.symmetric(horizontal: 20),
-                  child: Row(
-                    children: [
-                      _ServiceChip(label: 'Tidal', isSelected: selectedService == 'tidal', onTap: () => setModalState(() => selectedService = 'tidal')),
-                      const SizedBox(width: 8),
-                      _ServiceChip(label: 'Qobuz', isSelected: selectedService == 'qobuz', onTap: () => setModalState(() => selectedService = 'qobuz')),
-                      const SizedBox(width: 8),
-                      _ServiceChip(label: 'Amazon', isSelected: selectedService == 'amazon', onTap: () => setModalState(() => selectedService = 'amazon')),
-                    ],
-                  ),
-                ),
-                Padding(
-                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-                  child: Text('Select Quality', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
-                ),
-                // Disclaimer
-                Padding(
-                  padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
-                  child: Text(
-                    'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
-                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                      color: colorScheme.onSurfaceVariant,
-                      fontStyle: FontStyle.italic,
-                    ),
-                  ),
-                ),
-                _QualityPickerOption(
-                  title: 'FLAC Lossless',
-                  subtitle: '16-bit / 44.1kHz',
-                  icon: Icons.music_note,
-                  onTap: () { Navigator.pop(context); onSelect('LOSSLESS', selectedService); },
-                ),
-                _QualityPickerOption(
-                  title: 'Hi-Res FLAC',
-                  subtitle: '24-bit / up to 96kHz',
-                  icon: Icons.high_quality,
-                  onTap: () { Navigator.pop(context); onSelect('HI_RES', selectedService); },
-                ),
-                _QualityPickerOption(
-                  title: 'Hi-Res FLAC Max',
-                  subtitle: '24-bit / up to 192kHz',
-                  icon: Icons.four_k,
-                  onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS', selectedService); },
-                ),
-                const SizedBox(height: 16),
-              ],
-            ),
-          ),
+              ),
+            );
+          },
        ),
-      ),
+      );
+    }
+    
+    final tracks = await CsvImportService.pickAndParseCsv(
+      onProgress: (current, total) {
+        currentProgress = current;
+        totalTracks = total;
+        if (!dialogShown && total > 0) {
+          showProgressDialog();
+        }
+        setDialogState?.call(() {});
+      },
    );
+    
+    // Close progress dialog
+    if (dialogShown && mounted) {
+      Navigator.of(this.context).pop();
+    }
+    
+    if (tracks.isNotEmpty) {
+      final settings = ref.read(settingsProvider);
+      
+      if (!mounted) return;
+      
+      // Optionally show confirmation dialog
+      final confirmed = await showDialog<bool>(
+        context: this.context,
+        builder: (dialogCtx) => AlertDialog(
+          title: const Text('Import Playlist'),
+          content: Text('Found ${tracks.length} tracks in CSV. Add them to download queue?'),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(dialogCtx, false),
+              child: const Text('Cancel'),
+            ),
+            FilledButton(
+              onPressed: () => Navigator.pop(dialogCtx, true),
+              child: const Text('Import'),
+            ),
+          ],
+        ),
+      );
+
+      if (confirmed == true) {
+        ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, settings.defaultService);
+        if (mounted) {
+           ScaffoldMessenger.of(this.context).showSnackBar(
+            SnackBar(
+              content: Text('Added ${tracks.length} tracks to queue'),
+              action: SnackBarAction(
+                label: 'View Queue',
+                onPressed: () {
+                   // Navigate to queue tab (handled by main_shell index)
+                   // We don't have direct access to set index here easily without provider
+                },
+              ),
+            ),
+          );
+        }
+      }
+    } else {
+       // Only show error if pick was not cancelled (handled inside service logging usually, but maybe show snackbar if file empty)
+    }
  }

  @override
@@ -286,9 +330,14 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
    final error = ref.watch(trackProvider.select((s) => s.error));
    final hasSearchedBefore = ref.watch(settingsProvider.select((s) => s.hasSearchedBefore));
    
+    // Watch extension state to update search hint when extensions load/change
+    ref.watch(extensionProvider.select((s) => s.isInitialized));
+    ref.watch(extensionProvider.select((s) => s.extensions));
+    
    final colorScheme = Theme.of(context).colorScheme;
    final hasResults = _isTyping || tracks.isNotEmpty || (searchArtists != null && searchArtists.isNotEmpty) || isLoading;
    final screenHeight = MediaQuery.of(context).size.height;
+    final topPadding = MediaQuery.of(context).padding.top;
    final historyItems = ref.watch(downloadHistoryProvider.select((s) => s.items));

    return Scaffold(
@@ -297,24 +346,32 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
        slivers: [
          // App Bar - always present
          SliverAppBar(
-            expandedHeight: 130,
+            expandedHeight: 120 + topPadding,
            collapsedHeight: kToolbarHeight,
            floating: false,
            pinned: true,
            backgroundColor: colorScheme.surface,
            surfaceTintColor: Colors.transparent,
            automaticallyImplyLeading: false,
-            flexibleSpace: FlexibleSpaceBar(
-              expandedTitleScale: 1.3,
-              titlePadding: const EdgeInsets.only(left: 24, bottom: 16),
-              title: Text(
-                'Home',
-                style: TextStyle(
-                  fontSize: 28,
-                  fontWeight: FontWeight.bold,
-                  color: colorScheme.onSurface,
-                ),
-              ),
+            flexibleSpace: LayoutBuilder(
+              builder: (context, constraints) {
+                final maxHeight = 120 + topPadding;
+                final minHeight = kToolbarHeight + topPadding;
+                final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
+                
+                return FlexibleSpaceBar(
+                  expandedTitleScale: 1.0,
+                  titlePadding: const EdgeInsets.only(left: 24, bottom: 16),
+                  title: Text(
+                    'Home',
+                    style: TextStyle(
+                      fontSize: 20 + (14 * expandRatio), // 20 -> 34
+                      fontWeight: FontWeight.bold,
+                      color: colorScheme.onSurface,
+                    ),
+                  ),
+                );
+              },
            ),
          ),
          
@@ -329,12 +386,27 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
                      children: [
                        SizedBox(height: screenHeight * 0.06),
                        Container(
-                          padding: const EdgeInsets.all(24),
+                          width: 96,
+                          height: 96,
                          decoration: BoxDecoration(
-                            color: colorScheme.primaryContainer.withValues(alpha: 0.3),
+                            color: colorScheme.primary,
                            shape: BoxShape.circle,
                          ),
-                          child: Icon(Icons.music_note, size: 48, color: colorScheme.primary),
+                          child: Image.asset(
+                            'assets/images/logo-transparant.png',
+                            color: colorScheme.onPrimary, // Tint with onPrimary color
+                            fit: BoxFit.contain,
+                            errorBuilder: (_, _, _) => ClipRRect(
+                              // Fallback to original logo if transparent one is missing
+                              borderRadius: BorderRadius.circular(24),
+                              child: Image.asset(
+                                'assets/images/logo.png',
+                                width: 96,
+                                height: 96,
+                                fit: BoxFit.cover,
+                              ),
+                            ),
+                          ),
                        ),
                        const SizedBox(height: 16),
                        Text(
@@ -651,6 +723,11 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
  }

  Widget _buildArtistCard(SearchArtist artist, ColorScheme colorScheme) {
+    // Validate image URL - must be non-null, non-empty, and have a valid host
+    final hasValidImage = artist.imageUrl != null && 
+                          artist.imageUrl!.isNotEmpty &&
+                          Uri.tryParse(artist.imageUrl!)?.hasAuthority == true;
+    
    return GestureDetector(
      onTap: () => _navigateToArtist(artist.id, artist.name, artist.imageUrl),
      child: Container(
@@ -666,12 +743,17 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
                color: colorScheme.surfaceContainerHighest,
              ),
              child: ClipOval(
-                child: artist.imageUrl != null
+                child: hasValidImage
                    ? CachedNetworkImage(
                        imageUrl: artist.imageUrl!,
                        fit: BoxFit.cover,
                        memCacheWidth: 200,
                        memCacheHeight: 200,
+                        errorWidget: (context, url, error) => Icon(
+                          Icons.person,
+                          color: colorScheme.onSurfaceVariant,
+                          size: 44,
+                        ),
                      )
                    : Icon(Icons.person, color: colorScheme.onSurfaceVariant, size: 44),
              ),
@@ -703,6 +785,32 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
    ));
  }

+  /// Get search hint based on selected provider
+  String _getSearchHint() {
+    final settings = ref.read(settingsProvider);
+    final searchProvider = settings.searchProvider;
+    final extState = ref.read(extensionProvider);
+    
+    // If extension system not initialized yet, show default hint
+    if (!extState.isInitialized) {
+      return 'Paste Spotify URL or search...';
+    }
+    
+    if (searchProvider != null && searchProvider.isNotEmpty) {
+      final ext = extState.extensions.where((e) => e.id == searchProvider).firstOrNull;
+      // Only show extension placeholder if extension exists AND is enabled
+      if (ext != null && ext.enabled) {
+        if (ext.searchBehavior?.placeholder != null) {
+          return ext.searchBehavior!.placeholder!;
+        }
+        return 'Search with ${ext.displayName}...';
+      }
+      // Extension not found or disabled - clear the search provider setting
+      // and return default hint
+    }
+    return 'Paste Spotify URL or search...';
+  }
+
  Widget _buildSearchBar(ColorScheme colorScheme) {
    final hasText = _urlController.text.isNotEmpty;
    
@@ -711,7 +819,7 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
      focusNode: _searchFocusNode,
      autofocus: false,
      decoration: InputDecoration(
-        hintText: 'Paste Spotify URL or search...',
+        hintText: _getSearchHint(),
        filled: true,
        fillColor: colorScheme.surfaceContainerHighest,
        border: OutlineInputBorder(
@@ -736,12 +844,18 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
                onPressed: _clearAndRefresh,
                tooltip: 'Clear',
              )
-            else
+            else ...[
+              IconButton(
+                icon: const Icon(Icons.file_upload_outlined),
+                onPressed: () => _importCsv(context, ref),
+                tooltip: 'Import CSV',
+              ),
              IconButton(
                icon: const Icon(Icons.paste),
                onPressed: _pasteFromClipboard,
                tooltip: 'Paste',
              ),
+            ],
          ],
        ),
        contentPadding: const EdgeInsets.symmetric(horizontal: 20, vertical: 16),
@@ -771,147 +885,6 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient

 }

-class _QualityPickerOption extends StatelessWidget {
-  final String title;
-  final String subtitle;
-  final IconData icon;
-  final VoidCallback onTap;
-  const _QualityPickerOption({required this.title, required this.subtitle, required this.icon, required this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return ListTile(
-      contentPadding: const EdgeInsets.symmetric(horizontal: 24, vertical: 4),
-      leading: Container(padding: const EdgeInsets.all(10), decoration: BoxDecoration(color: colorScheme.primaryContainer, borderRadius: BorderRadius.circular(12)), child: Icon(icon, color: colorScheme.onPrimaryContainer, size: 20)),
-      title: Text(title, style: const TextStyle(fontWeight: FontWeight.w500)),
-      subtitle: Text(subtitle, style: TextStyle(color: colorScheme.onSurfaceVariant)),
-      onTap: onTap,
-    );
-  }
-}
-
-class _ServiceChip extends StatelessWidget {
-  final String label;
-  final bool isSelected;
-  final VoidCallback onTap;
-  const _ServiceChip({required this.label, required this.isSelected, required this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Expanded(
-      child: GestureDetector(
-        onTap: onTap,
-        child: AnimatedContainer(
-          duration: const Duration(milliseconds: 200),
-          padding: const EdgeInsets.symmetric(vertical: 10),
-          decoration: BoxDecoration(
-            color: isSelected ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
-            borderRadius: BorderRadius.circular(12),
-            border: isSelected ? null : Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-          ),
-          child: Text(
-            label,
-            textAlign: TextAlign.center,
-            style: TextStyle(
-              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
-              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-}
-
-class _TrackInfoHeader extends StatefulWidget {
-  final String trackName;
-  final String? artistName;
-  final String? coverUrl;
-  const _TrackInfoHeader({required this.trackName, this.artistName, this.coverUrl});
-
-  @override
-  State<_TrackInfoHeader> createState() => _TrackInfoHeaderState();
-}
-
-class _TrackInfoHeaderState extends State<_TrackInfoHeader> {
-  bool _expanded = false;
-  bool _isOverflowing = false;
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Material(
-      color: Colors.transparent,
-      child: InkWell(
-        onTap: _isOverflowing ? () => setState(() => _expanded = !_expanded) : null,
-        borderRadius: const BorderRadius.only(topLeft: Radius.circular(28), topRight: Radius.circular(28)),
-        child: Column(
-          children: [
-            const SizedBox(height: 8),
-            Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2))),
-            Padding(
-              padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
-              child: Row(
-                children: [
-                  ClipRRect(
-                    borderRadius: BorderRadius.circular(8),
-                    child: widget.coverUrl != null
-                        ? Image.network(widget.coverUrl!, width: 56, height: 56, fit: BoxFit.cover,
-                            errorBuilder: (_, e, s) => Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)))
-                        : Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)),
-                  ),
-                  const SizedBox(width: 12),
-                  Expanded(
-                    child: LayoutBuilder(
-                      builder: (context, constraints) {
-                        final titleStyle = Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600);
-                        final titleSpan = TextSpan(text: widget.trackName, style: titleStyle);
-                        final titlePainter = TextPainter(text: titleSpan, maxLines: 1, textDirection: TextDirection.ltr)..layout(maxWidth: constraints.maxWidth);
-                        final titleOverflows = titlePainter.didExceedMaxLines;
-                        
-                        WidgetsBinding.instance.addPostFrameCallback((_) {
-                          if (mounted && _isOverflowing != titleOverflows) {
-                            setState(() => _isOverflowing = titleOverflows);
-                          }
-                        });
-                        
-                        return Column(
-                          crossAxisAlignment: CrossAxisAlignment.start,
-                          children: [
-                            Text(
-                              widget.trackName,
-                              style: titleStyle,
-                              maxLines: _expanded ? 10 : 1,
-                              overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
-                            ),
-                            if (widget.artistName != null) ...[
-                              const SizedBox(height: 2),
-                              Text(
-                                widget.artistName!,
-                                style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
-                                maxLines: _expanded ? 3 : 1,
-                                overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
-                              ),
-                            ],
-                          ],
-                        );
-                      },
-                    ),
-                  ),
-                  if (_isOverflowing || _expanded)
-                    Icon(_expanded ? Icons.expand_less : Icons.expand_more, color: colorScheme.onSurfaceVariant, size: 20),
-                ],
-              ),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
-
 /// Separate Consumer widget for each track item - only rebuilds when this specific track's status changes
 class _TrackItemWithStatus extends ConsumerWidget {
  final Track track;
@@ -941,6 +914,28 @@ class _TrackItemWithStatus extends ConsumerWidget {
      return state.isDownloaded(track.id);
    }));
    
+    // Get thumbnail size from extension if track is from extension
+    double thumbWidth = 56;
+    double thumbHeight = 56;
+    
+    // Get extension ID from track.source or from TrackState.searchExtensionId
+    final trackState = ref.watch(trackProvider);
+    final extensionId = track.source ?? trackState.searchExtensionId;
+    
+    if (extensionId != null && extensionId.isNotEmpty) {
+      final extState = ref.watch(extensionProvider);
+      final extension = extState.extensions.where((e) => e.id == extensionId).firstOrNull;
+      if (extension?.searchBehavior != null) {
+        final size = extension!.searchBehavior!.getThumbnailSize(defaultSize: 56);
+        thumbWidth = size.$1;
+        thumbHeight = size.$2;
+        // Debug: log only when using custom size
+        if (thumbWidth != 56 || thumbHeight != 56) {
+          debugPrint('[Thumbnail] ${track.name}: using ${thumbWidth.toInt()}x${thumbHeight.toInt()} from ${extension.id}');
+        }
+      }
+    }
+    
    final isQueued = queueItem != null;
    final isDownloading = queueItem?.status == DownloadStatus.downloading;
    final isFinalizing = queueItem?.status == DownloadStatus.finalizing;
@@ -961,21 +956,21 @@ class _TrackItemWithStatus extends ConsumerWidget {
            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
            child: Row(
              children: [
-                // Album art
+                // Album art with dynamic size based on extension config
                ClipRRect(
                  borderRadius: BorderRadius.circular(10),
                  child: track.coverUrl != null
                      ? CachedNetworkImage(
                          imageUrl: track.coverUrl!,
-                          width: 56,
-                          height: 56,
+                          width: thumbWidth,
+                          height: thumbHeight,
                          fit: BoxFit.cover,
-                          memCacheWidth: 112,
-                          memCacheHeight: 112,
+                          memCacheWidth: (thumbWidth * 2).toInt(),
+                          memCacheHeight: (thumbHeight * 2).toInt(),
                        )
                      : Container(
-                          width: 56,
-                          height: 56,
+                          width: thumbWidth,
+                          height: thumbHeight,
                          color: colorScheme.surfaceContainerHighest,
                          child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant),
                        ),
@@ -1012,7 +1007,7 @@ class _TrackItemWithStatus extends ConsumerWidget {
          Divider(
            height: 1,
            thickness: 1,
-            indent: 80,
+            indent: thumbWidth + 24, // Adjust divider indent based on thumbnail width
            endIndent: 12,
            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
          ),
@@ -6,6 +6,7 @@ import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
 import 'package:spotiflac_android/providers/track_provider.dart';
 import 'package:spotiflac_android/screens/home_tab.dart';
+import 'package:spotiflac_android/screens/store_tab.dart';
 import 'package:spotiflac_android/screens/queue_tab.dart';
 import 'package:spotiflac_android/screens/settings/settings_tab.dart';
 import 'package:spotiflac_android/services/share_intent_service.dart';
@@ -62,6 +63,9 @@ class _MainShellState extends ConsumerState<MainShell> {
  }

  void _handleSharedUrl(String url) {
+    // Pop any existing screens (Album, Artist, Settings sub-pages) to return to root
+    Navigator.of(context).popUntil((route) => route.isFirst);
+    
    // Navigate to Home tab
    if (_currentIndex != 0) {
      _onNavTap(0);
@@ -118,6 +122,8 @@ class _MainShellState extends ConsumerState<MainShell> {
  void _onPageChanged(int index) {
    if (_currentIndex != index) {
      setState(() => _currentIndex = index);
+      // Unfocus any text field when switching tabs to prevent keyboard from appearing
+      FocusScope.of(context).unfocus();
    }
  }

@@ -169,6 +175,7 @@ class _MainShellState extends ConsumerState<MainShell> {
  Widget build(BuildContext context) {
    final queueState = ref.watch(downloadQueueProvider.select((s) => s.queuedCount));
    final trackState = ref.watch(trackProvider);
+    final showStore = ref.watch(settingsProvider.select((s) => s.showExtensionStore));
    
    // Check if keyboard is visible (bottom inset > 0 means keyboard is showing)
    final isKeyboardVisible = MediaQuery.of(context).viewInsets.bottom > 0;
@@ -182,6 +189,61 @@ class _MainShellState extends ConsumerState<MainShell> {
                   !trackState.isLoading &&
                   !isKeyboardVisible;

+    // Build tabs and destinations based on settings
+    final tabs = <Widget>[
+      const HomeTab(),
+      QueueTab(
+        parentPageController: _pageController,
+        parentPageIndex: 1,
+        nextPageIndex: showStore ? 2 : 3,
+      ),
+      if (showStore) const StoreTab(),
+      const SettingsTab(),
+    ];
+
+    final destinations = <NavigationDestination>[
+      const NavigationDestination(
+        icon: Icon(Icons.home_outlined),
+        selectedIcon: Icon(Icons.home),
+        label: 'Home',
+      ),
+      NavigationDestination(
+        icon: Badge(
+          isLabelVisible: queueState > 0,
+          label: Text('$queueState'),
+          child: const Icon(Icons.history_outlined),
+        ),
+        selectedIcon: Badge(
+          isLabelVisible: queueState > 0,
+          label: Text('$queueState'),
+          child: const Icon(Icons.history),
+        ),
+        label: 'History',
+      ),
+      if (showStore)
+        const NavigationDestination(
+          icon: Icon(Icons.store_outlined),
+          selectedIcon: Icon(Icons.store),
+          label: 'Store',
+        ),
+      const NavigationDestination(
+        icon: Icon(Icons.settings_outlined),
+        selectedIcon: Icon(Icons.settings),
+        label: 'Settings',
+      ),
+    ];
+
+    // Clamp current index if tabs changed
+    final maxIndex = tabs.length - 1;
+    if (_currentIndex > maxIndex) {
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        if (mounted) {
+          setState(() => _currentIndex = maxIndex);
+          _pageController.jumpToPage(maxIndex);
+        }
+      });
+    }
+
    return PopScope(
      canPop: canPop,
      onPopInvokedWithResult: (didPop, result) async {
@@ -198,45 +260,17 @@ class _MainShellState extends ConsumerState<MainShell> {
        body: PageView(
          controller: _pageController,
          onPageChanged: _onPageChanged,
-          physics: const BouncingScrollPhysics(),
-          children: const [
-            HomeTab(),
-            QueueTab(),
-            SettingsTab(),
-          ],
+          physics: const ClampingScrollPhysics(),
+          children: tabs,
        ),
        bottomNavigationBar: NavigationBar(
-          selectedIndex: _currentIndex,
+          selectedIndex: _currentIndex.clamp(0, maxIndex),
          onDestinationSelected: _onNavTap,
          animationDuration: const Duration(milliseconds: 200),
          backgroundColor: Theme.of(context).brightness == Brightness.dark
              ? Color.alphaBlend(Colors.white.withValues(alpha: 0.05), Theme.of(context).colorScheme.surface)
              : Color.alphaBlend(Colors.black.withValues(alpha: 0.03), Theme.of(context).colorScheme.surface),
-          destinations: [
-            const NavigationDestination(
-              icon: Icon(Icons.home_outlined),
-              selectedIcon: Icon(Icons.home),
-              label: 'Home',
-            ),
-            NavigationDestination(
-              icon: Badge(
-                isLabelVisible: queueState > 0,
-                label: Text('$queueState'),
-                child: const Icon(Icons.history_outlined),
-              ),
-              selectedIcon: Badge(
-                isLabelVisible: queueState > 0,
-                label: Text('$queueState'),
-                child: const Icon(Icons.history),
-              ),
-              label: 'History',
-            ),
-            const NavigationDestination(
-              icon: Icon(Icons.settings_outlined),
-              selectedIcon: Icon(Icons.settings),
-              label: 'Settings',
-            ),
-          ],
+          destinations: destinations,
        ),
      ),
    );
@@ -6,6 +6,7 @@ import 'package:spotiflac_android/models/track.dart';
 import 'package:spotiflac_android/models/download_item.dart';
 import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/widgets/download_service_picker.dart';

 /// Playlist detail screen with Material Expressive 3 design
 class PlaylistScreen extends ConsumerWidget {
@@ -168,10 +169,16 @@ class PlaylistScreen extends ConsumerWidget {
  void _downloadTrack(BuildContext context, WidgetRef ref, Track track) {
    final settings = ref.read(settingsProvider);
    if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, ref, (quality, service) {
-        ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
-      }, trackName: track.name, artistName: track.artistName, coverUrl: track.coverUrl);
+      DownloadServicePicker.show(
+        context,
+        trackName: track.name,
+        artistName: track.artistName,
+        coverUrl: track.coverUrl,
+        onSelect: (quality, service) {
+          ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
+          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
+        },
+      );
    } else {
      ref.read(downloadQueueProvider.notifier).addToQueue(track, settings.defaultService);
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
@@ -182,222 +189,20 @@ class PlaylistScreen extends ConsumerWidget {
    if (tracks.isEmpty) return;
    final settings = ref.read(settingsProvider);
    if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, ref, (quality, service) {
-        ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, service, qualityOverride: quality);
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
-      }, trackName: '${tracks.length} tracks', artistName: playlistName);
+      DownloadServicePicker.show(
+        context,
+        trackName: '${tracks.length} tracks',
+        artistName: playlistName,
+        onSelect: (quality, service) {
+          ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, service, qualityOverride: quality);
+          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
+        },
+      );
    } else {
      ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, settings.defaultService);
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
    }
  }
-
-  void _showQualityPicker(BuildContext context, WidgetRef ref, void Function(String quality, String service) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
-    final colorScheme = Theme.of(context).colorScheme;
-    final settings = ref.read(settingsProvider);
-    String selectedService = settings.defaultService;
-    
-    showModalBottomSheet(
-      context: context,
-      backgroundColor: colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
-      isScrollControlled: true,
-      builder: (context) => StatefulBuilder(
-        builder: (context, setModalState) => SafeArea(
-          child: SingleChildScrollView(
-            child: Column(
-              mainAxisSize: MainAxisSize.min,
-              crossAxisAlignment: CrossAxisAlignment.start,
-              children: [
-                if (trackName != null) ...[
-                  _TrackInfoHeader(trackName: trackName, artistName: artistName, coverUrl: coverUrl),
-                  Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-                ] else ...[
-                  const SizedBox(height: 8),
-                  Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
-                ],
-                // Service selector
-                Padding(
-                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-                  child: Text('Download From', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
-                ),
-                Padding(
-                  padding: const EdgeInsets.symmetric(horizontal: 20),
-                  child: Row(
-                    children: [
-                      _ServiceChip(label: 'Tidal', isSelected: selectedService == 'tidal', onTap: () => setModalState(() => selectedService = 'tidal')),
-                      const SizedBox(width: 8),
-                      _ServiceChip(label: 'Qobuz', isSelected: selectedService == 'qobuz', onTap: () => setModalState(() => selectedService = 'qobuz')),
-                      const SizedBox(width: 8),
-                      _ServiceChip(label: 'Amazon', isSelected: selectedService == 'amazon', onTap: () => setModalState(() => selectedService = 'amazon')),
-                    ],
-                  ),
-                ),
-                Padding(padding: const EdgeInsets.fromLTRB(24, 16, 24, 8), child: Text('Select Quality', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold))),
-                // Disclaimer
-                Padding(
-                  padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
-                  child: Text(
-                    'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
-                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                      color: colorScheme.onSurfaceVariant,
-                      fontStyle: FontStyle.italic,
-                    ),
-                  ),
-                ),
-                _QualityOption(title: 'FLAC Lossless', subtitle: '16-bit / 44.1kHz', icon: Icons.music_note, onTap: () { Navigator.pop(context); onSelect('LOSSLESS', selectedService); }),
-                _QualityOption(title: 'Hi-Res FLAC', subtitle: '24-bit / up to 96kHz', icon: Icons.high_quality, onTap: () { Navigator.pop(context); onSelect('HI_RES', selectedService); }),
-                _QualityOption(title: 'Hi-Res FLAC Max', subtitle: '24-bit / up to 192kHz', icon: Icons.four_k, onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS', selectedService); }),
-                const SizedBox(height: 16),
-              ],
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-}
-
-class _QualityOption extends StatelessWidget {
-  final String title;
-  final String subtitle;
-  final IconData icon;
-  final VoidCallback onTap;
-
-  const _QualityOption({required this.title, required this.subtitle, required this.icon, required this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return ListTile(
-      contentPadding: const EdgeInsets.symmetric(horizontal: 24, vertical: 4),
-      leading: Container(padding: const EdgeInsets.all(10), decoration: BoxDecoration(color: colorScheme.primaryContainer, borderRadius: BorderRadius.circular(12)), child: Icon(icon, color: colorScheme.onPrimaryContainer, size: 20)),
-      title: Text(title, style: const TextStyle(fontWeight: FontWeight.w500)),
-      subtitle: Text(subtitle, style: TextStyle(color: colorScheme.onSurfaceVariant)),
-      onTap: onTap,
-    );
-  }
-}
-
-class _ServiceChip extends StatelessWidget {
-  final String label;
-  final bool isSelected;
-  final VoidCallback onTap;
-  const _ServiceChip({required this.label, required this.isSelected, required this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Expanded(
-      child: GestureDetector(
-        onTap: onTap,
-        child: AnimatedContainer(
-          duration: const Duration(milliseconds: 200),
-          padding: const EdgeInsets.symmetric(vertical: 10),
-          decoration: BoxDecoration(
-            color: isSelected ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
-            borderRadius: BorderRadius.circular(12),
-            border: isSelected ? null : Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-          ),
-          child: Text(
-            label,
-            textAlign: TextAlign.center,
-            style: TextStyle(
-              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
-              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-}
-
-class _TrackInfoHeader extends StatefulWidget {
-  final String trackName;
-  final String? artistName;
-  final String? coverUrl;
-  const _TrackInfoHeader({required this.trackName, this.artistName, this.coverUrl});
-
-  @override
-  State<_TrackInfoHeader> createState() => _TrackInfoHeaderState();
-}
-
-class _TrackInfoHeaderState extends State<_TrackInfoHeader> {
-  bool _expanded = false;
-  bool _isOverflowing = false;
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Material(
-      color: Colors.transparent,
-      child: InkWell(
-        onTap: _isOverflowing ? () => setState(() => _expanded = !_expanded) : null,
-        borderRadius: const BorderRadius.only(topLeft: Radius.circular(28), topRight: Radius.circular(28)),
-        child: Column(
-          children: [
-            const SizedBox(height: 8),
-            Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2))),
-            Padding(
-              padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
-              child: Row(
-                children: [
-                  ClipRRect(
-                    borderRadius: BorderRadius.circular(8),
-                    child: widget.coverUrl != null
-                        ? Image.network(widget.coverUrl!, width: 56, height: 56, fit: BoxFit.cover,
-                            errorBuilder: (_, e, s) => Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)))
-                        : Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)),
-                  ),
-                  const SizedBox(width: 12),
-                  Expanded(
-                    child: LayoutBuilder(
-                      builder: (context, constraints) {
-                        final titleStyle = Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600);
-                        final titleSpan = TextSpan(text: widget.trackName, style: titleStyle);
-                        final titlePainter = TextPainter(text: titleSpan, maxLines: 1, textDirection: TextDirection.ltr)..layout(maxWidth: constraints.maxWidth);
-                        final titleOverflows = titlePainter.didExceedMaxLines;
-                        
-                        WidgetsBinding.instance.addPostFrameCallback((_) {
-                          if (mounted && _isOverflowing != titleOverflows) {
-                            setState(() => _isOverflowing = titleOverflows);
-                          }
-                        });
-                        
-                        return Column(
-                          crossAxisAlignment: CrossAxisAlignment.start,
-                          children: [
-                            Text(
-                              widget.trackName,
-                              style: titleStyle,
-                              maxLines: _expanded ? 10 : 1,
-                              overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
-                            ),
-                            if (widget.artistName != null) ...[
-                              const SizedBox(height: 2),
-                              Text(
-                                widget.artistName!,
-                                style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
-                                maxLines: _expanded ? 3 : 1,
-                                overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
-                              ),
-                            ],
-                          ],
-                        );
-                      },
-                    ),
-                  ),
-                  if (_isOverflowing || _expanded)
-                    Icon(_expanded ? Icons.expand_less : Icons.expand_more, color: colorScheme.onSurfaceVariant, size: 20),
-                ],
-              ),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
 }

 /// Separate Consumer widget for each track - only rebuilds when this specific track's status changes
@@ -13,45 +13,45 @@ class AboutPage extends StatelessWidget {
    final topPadding = MediaQuery.of(context).padding.top;

    return PopScope(
-      canPop: true,
+      canPop: true, // Always allow back gesture
      child: Scaffold(
        body: CustomScrollView(
          slivers: [
            // Collapsing App Bar with back button
            SliverAppBar(
-              expandedHeight: 120 + topPadding,
-              collapsedHeight: kToolbarHeight,
-              floating: false,
-              pinned: true,
-              backgroundColor: colorScheme.surface,
-              surfaceTintColor: Colors.transparent,
-              leading: IconButton(
-                icon: const Icon(Icons.arrow_back),
-                onPressed: () => Navigator.pop(context),
-              ),
-              flexibleSpace: LayoutBuilder(
-                builder: (context, constraints) {
-                  final maxHeight = 120 + topPadding;
-                  final minHeight = kToolbarHeight + topPadding;
-                  final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
-                  // When collapsed (expandRatio=0): left=56 to avoid back button
-                  // When expanded (expandRatio=1): left=24 for normal padding
-                  final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
-                  return FlexibleSpaceBar(
-                    expandedTitleScale: 1.0,
-                    titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
-                    title: Text(
-                      'About',
-                      style: TextStyle(
-                        fontSize: 20 + (8 * expandRatio), // 20 -> 28
-                        fontWeight: FontWeight.bold,
-                        color: colorScheme.onSurface,
-                      ),
-                    ),
-                  );
-                },
-              ),
+            expandedHeight: 120 + topPadding,
+            collapsedHeight: kToolbarHeight,
+            floating: false,
+            pinned: true,
+            backgroundColor: colorScheme.surface,
+            surfaceTintColor: Colors.transparent,
+            leading: IconButton(
+              icon: const Icon(Icons.arrow_back),
+              onPressed: () => Navigator.pop(context),
            ),
+            flexibleSpace: LayoutBuilder(
+              builder: (context, constraints) {
+                final maxHeight = 120 + topPadding;
+                final minHeight = kToolbarHeight + topPadding;
+                final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
+                // When collapsed (expandRatio=0): left=56 to avoid back button
+                // When expanded (expandRatio=1): left=24 for normal padding
+                final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
+                return FlexibleSpaceBar(
+                  expandedTitleScale: 1.0,
+                  titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+                  title: Text(
+                    'About',
+                    style: TextStyle(
+                      fontSize: 20 + (8 * expandRatio), // 20 -> 28
+                      fontWeight: FontWeight.bold,
+                      color: colorScheme.onSurface,
+                    ),
+                  ),
+                );
+              },
+            ),
+          ),

          // App header card with logo and description
          SliverToBoxAdapter(
@@ -109,14 +109,14 @@ class AboutPage extends StatelessWidget {
                  githubUsername: 'sachinsenal0x64',
                  showDivider: true,
                ),
-                SettingsItem(
+                _AboutSettingsItem(
                  icon: Icons.cloud_outlined,
                  title: 'DoubleDouble',
                  subtitle: 'Amazing API for Amazon Music downloads. Thank you for making it free!',
                  onTap: () => _launchUrl('https://doubledouble.top'),
                  showDivider: true,
                ),
-                SettingsItem(
+                _AboutSettingsItem(
                  icon: Icons.music_note_outlined,
                  title: 'DAB Music',
                  subtitle: 'The best Qobuz streaming API. Hi-Res downloads wouldn\'t be possible without this!',
@@ -220,7 +220,7 @@ class AboutPage extends StatelessWidget {
          const SliverToBoxAdapter(child: SizedBox(height: 16)),
        ],
      ),
-      ),
+    ),
    );
  }

@@ -249,30 +249,26 @@ class _AppHeaderCard extends StatelessWidget {
      padding: const EdgeInsets.all(24),
      child: Column(
        children: [
+          // App logo
          // App logo
          Container(
            width: 88,
            height: 88,
            decoration: BoxDecoration(
-              color: colorScheme.primaryContainer,
-              borderRadius: BorderRadius.circular(24),
-              boxShadow: [
-                BoxShadow(
-                  color: colorScheme.primary.withValues(alpha: 0.2),
-                  blurRadius: 16,
-                  offset: const Offset(0, 4),
-                ),
-              ],
+              color: colorScheme.primary,
+              shape: BoxShape.circle,
            ),
-            child: ClipRRect(
-              borderRadius: BorderRadius.circular(24),
-              child: Image.asset(
-                'assets/images/logo.png',
-                fit: BoxFit.cover,
-                errorBuilder: (_, _, _) => Icon(
-                  Icons.music_note,
-                  size: 48,
-                  color: colorScheme.onPrimaryContainer,
+            child: Image.asset(
+              'assets/images/logo-transparant.png',
+              color: colorScheme.onPrimary, // Tint with onPrimary color
+              fit: BoxFit.contain,
+              errorBuilder: (_, _, _) => ClipRRect(
+                borderRadius: BorderRadius.circular(24),
+                child: Image.asset(
+                  'assets/images/logo.png',
+                  width: 88,
+                  height: 88,
+                  fit: BoxFit.cover,
                ),
              ),
            ),
@@ -417,3 +413,80 @@ class _ContributorItem extends StatelessWidget {
    await launchUrl(uri, mode: LaunchMode.inAppBrowserView);
  }
 }
+
+/// Settings item with 40x40 icon area to align with contributor avatars
+class _AboutSettingsItem extends StatelessWidget {
+  final IconData icon;
+  final String title;
+  final String? subtitle;
+  final VoidCallback? onTap;
+  final bool showDivider;
+
+  const _AboutSettingsItem({
+    required this.icon,
+    required this.title,
+    this.subtitle,
+    this.onTap,
+    this.showDivider = true,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        InkWell(
+          onTap: onTap,
+          splashColor: colorScheme.primary.withValues(alpha: 0.12),
+          highlightColor: colorScheme.primary.withValues(alpha: 0.08),
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
+            child: Row(
+              children: [
+                // Icon with 40x40 size to match avatar
+                SizedBox(
+                  width: 40,
+                  height: 40,
+                  child: Icon(icon, color: colorScheme.onSurfaceVariant, size: 24),
+                ),
+                const SizedBox(width: 16),
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        title,
+                        style: Theme.of(context).textTheme.bodyLarge,
+                      ),
+                      if (subtitle != null) ...[
+                        const SizedBox(height: 2),
+                        Text(
+                          subtitle!,
+                          style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                            color: colorScheme.onSurfaceVariant,
+                          ),
+                        ),
+                      ],
+                    ],
+                  ),
+                ),
+                if (onTap != null)
+                  Icon(Icons.chevron_right, color: colorScheme.onSurfaceVariant),
+              ],
+            ),
+          ),
+        ),
+        if (showDivider)
+          Divider(
+            height: 1,
+            thickness: 1,
+            indent: 76, // 20 + 40 + 16 = 76 (same as contributor item)
+            endIndent: 20,
+            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+          ),
+      ],
+    );
+  }
+}
@@ -15,80 +15,120 @@ class AppearanceSettingsPage extends ConsumerWidget {
    final topPadding = MediaQuery.of(context).padding.top;

    return PopScope(
-      canPop: true,
+      canPop: true, // Always allow back gesture
      child: Scaffold(
        body: CustomScrollView(
          slivers: [
            // Collapsing App Bar with back button
            SliverAppBar(
-              expandedHeight: 120 + topPadding,
-              collapsedHeight: kToolbarHeight,
-              floating: false,
-              pinned: true,
-              backgroundColor: colorScheme.surface,
-              surfaceTintColor: Colors.transparent,
-              leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
-              flexibleSpace: _AppBarTitle(title: 'Appearance', topPadding: topPadding),
+            expandedHeight: 120 + topPadding,
+            collapsedHeight: kToolbarHeight,
+            floating: false,
+            pinned: true,
+            backgroundColor: colorScheme.surface,
+            surfaceTintColor: Colors.transparent,
+            leading: IconButton(
+              icon: const Icon(Icons.arrow_back),
+              onPressed: () => Navigator.pop(context),
+            ),
+            flexibleSpace: _AppBarTitle(
+              title: 'Appearance',
+              topPadding: topPadding,
+            ),
+          ),
+
+            // Preview Section
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.symmetric(
+                  horizontal: 16,
+                  vertical: 8,
+                ),
+                child: _ThemePreviewCard(),
+              ),
+            ),
+
+            // Color section
+            const SliverToBoxAdapter(
+              child: SettingsSectionHeader(title: 'Color'),
            ),

-            // Theme section
-            const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Theme')),
            SliverToBoxAdapter(
              child: SettingsGroup(
                children: [
-                  _ThemeModeSelector(
-                    currentMode: themeSettings.themeMode,
-                    onChanged: (mode) => ref.read(themeProvider.notifier).setThemeMode(mode),
-                  ),
                  SettingsSwitchItem(
-                    icon: Icons.brightness_2,
-                    title: 'AMOLED Dark',
-                    subtitle: 'Pure black background for OLED screens',
-                    value: themeSettings.useAmoled,
-                    onChanged: (value) => ref.read(themeProvider.notifier).setUseAmoled(value),
+                    icon: Icons.wallpaper,
+                    title: 'Dynamic Color',
+                    subtitle: 'Use colors from your wallpaper',
+                    value: themeSettings.useDynamicColor,
+                    onChanged: (value) => ref
+                        .read(themeProvider.notifier)
+                        .setUseDynamicColor(value),
                    showDivider: false,
                  ),
                ],
              ),
            ),
+            if (!themeSettings.useDynamicColor)
+              SliverToBoxAdapter(
+                child: Padding(
+                  padding: const EdgeInsets.fromLTRB(16, 12, 16, 0),
+                  child: _ColorPalettePicker(
+                    currentColor: themeSettings.seedColorValue,
+                    onColorSelected: (color) =>
+                        ref.read(themeProvider.notifier).setSeedColor(color),
+                  ),
+                ),
+              ),

-            // Color section
-            const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Color')),
+            // Theme section
+            const SliverToBoxAdapter(
+              child: SettingsSectionHeader(title: 'Theme'),
+            ),
            SliverToBoxAdapter(
              child: SettingsGroup(
                children: [
-                  SettingsSwitchItem(
-                    icon: Icons.auto_awesome,
-                    title: 'Dynamic Color',
-                    subtitle: 'Use colors from your wallpaper',
-                    value: themeSettings.useDynamicColor,
-                    onChanged: (value) => ref.read(themeProvider.notifier).setUseDynamicColor(value),
-                    showDivider: !themeSettings.useDynamicColor,
+                  _ThemeModeSelector(
+                    currentMode: themeSettings.themeMode,
+                    onChanged: (mode) =>
+                        ref.read(themeProvider.notifier).setThemeMode(mode),
                  ),
-                  if (!themeSettings.useDynamicColor)
-                    _ColorPicker(
-                      currentColor: themeSettings.seedColorValue,
-                      onColorSelected: (color) => ref.read(themeProvider.notifier).setSeedColor(color),
+                  if (Theme.of(context).brightness == Brightness.dark)
+                    SettingsSwitchItem(
+                      icon: Icons.brightness_2,
+                      title: 'AMOLED Dark',
+                      subtitle: 'Pure black background',
+                      value: themeSettings.useAmoled,
+                      onChanged: (value) =>
+                          ref.read(themeProvider.notifier).setUseAmoled(value),
+                      showDivider: false,
                    ),
                ],
              ),
            ),

            // Layout section
-            const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Layout')),
+            const SliverToBoxAdapter(
+              child: SettingsSectionHeader(title: 'Layout'),
+            ),
            SliverToBoxAdapter(
              child: SettingsGroup(
                children: [
                  _HistoryViewSelector(
                    currentMode: settings.historyViewMode,
-                    onChanged: (mode) => ref.read(settingsProvider.notifier).setHistoryViewMode(mode),
+                    onChanged: (mode) => ref
+                        .read(settingsProvider.notifier)
+                        .setHistoryViewMode(mode),
                  ),
                ],
              ),
            ),

            // Fill remaining for scroll
-            const SliverFillRemaining(hasScrollBody: false, child: SizedBox()),
+            const SliverFillRemaining(
+              hasScrollBody: false,
+              child: SizedBox(height: 32),
+            ),
          ],
        ),
      ),
@@ -96,11 +136,275 @@ class AppearanceSettingsPage extends ConsumerWidget {
  }
 }

+/// A simplified preview of how the app looks with current settings
+class _ThemePreviewCard extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+
+    return RepaintBoundary(
+      child: Container(
+        height: 200,
+        width: double.infinity,
+        decoration: BoxDecoration(
+          color: colorScheme
+              .surfaceContainerHighest, // Background similar to reference
+          borderRadius: BorderRadius.circular(28),
+        ),
+        clipBehavior: Clip.antiAlias,
+        child: Stack(
+          children: [
+            // Decorative background blobs
+            Positioned(
+              top: -50,
+              right: -50,
+              child: Container(
+                width: 200,
+                height: 200,
+                decoration: BoxDecoration(
+                  shape: BoxShape.circle,
+                  color: colorScheme.primaryContainer.withValues(alpha: 0.5),
+                ),
+              ),
+            ),
+            Positioned(
+              bottom: -30,
+              left: -30,
+              child: Container(
+                width: 150,
+                height: 150,
+                decoration: BoxDecoration(
+                  shape: BoxShape.circle,
+                  color: colorScheme.tertiaryContainer.withValues(alpha: 0.5),
+                ),
+              ),
+            ),
+
+            // Foreground "fake UI"
+            Center(
+              child: Container(
+                width: 260,
+                height: 140,
+                padding: const EdgeInsets.all(16),
+                decoration: BoxDecoration(
+                  color: colorScheme.surface,
+                  borderRadius: BorderRadius.circular(20),
+                  boxShadow: [
+                    BoxShadow(
+                      color: Colors.black.withValues(alpha: 0.1),
+                      blurRadius: 12, // Reduced from 20 for performance
+                      offset: const Offset(0, 8),
+                    ),
+                  ],
+                ),
+                child: Row(
+                  children: [
+                    // Fake Album Art
+                    Container(
+                      width: 108,
+                      height: 108,
+                      decoration: BoxDecoration(
+                        color: colorScheme.primary,
+                        borderRadius: BorderRadius.circular(16),
+                      ),
+                      child: Icon(
+                        Icons.music_note,
+                        color: colorScheme.onPrimary,
+                        size: 48,
+                      ),
+                    ),
+                    const SizedBox(width: 16),
+
+                    // Fake Text Info
+                    Expanded(
+                      child: Column(
+                        crossAxisAlignment: CrossAxisAlignment.start,
+                        mainAxisAlignment: MainAxisAlignment.center,
+                        children: [
+                          Container(
+                            width: double.infinity,
+                            height: 14,
+                            decoration: BoxDecoration(
+                              color: colorScheme.onSurface,
+                              borderRadius: BorderRadius.circular(4),
+                            ),
+                          ),
+                          const SizedBox(height: 8),
+                          Container(
+                            width: 80,
+                            height: 10,
+                            decoration: BoxDecoration(
+                              color: colorScheme.primary,
+                              borderRadius: BorderRadius.circular(4),
+                            ),
+                          ),
+                          const SizedBox(height: 24),
+                          Row(
+                            children: [
+                              Icon(
+                                Icons.skip_previous,
+                                size: 24,
+                                color: colorScheme.onSurfaceVariant,
+                              ),
+                              const SizedBox(width: 12),
+                              Icon(
+                                Icons.play_circle_fill,
+                                size: 32,
+                                color: colorScheme.primary,
+                              ),
+                              const SizedBox(width: 12),
+                              Icon(
+                                Icons.skip_next,
+                                size: 24,
+                                color: colorScheme.onSurfaceVariant,
+                              ),
+                            ],
+                          ),
+                        ],
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+
+            // Label badge
+            Positioned(
+              bottom: 12,
+              right: 12,
+              child: Container(
+                padding: const EdgeInsets.symmetric(
+                  horizontal: 10,
+                  vertical: 4,
+                ),
+                decoration: BoxDecoration(
+                  color: Colors.black.withValues(alpha: 0.6),
+                  borderRadius: BorderRadius.circular(20),
+                ),
+                child: Text(
+                  isDark ? 'Dark Mode' : 'Light Mode',
+                  style: const TextStyle(
+                    color: Colors.white,
+                    fontSize: 10,
+                    fontWeight: FontWeight.bold,
+                  ),
+                ),
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _ColorPalettePicker extends StatelessWidget {
+  final int currentColor;
+  final ValueChanged<Color> onColorSelected;
+  const _ColorPalettePicker({
+    required this.currentColor,
+    required this.onColorSelected,
+  });
+
+  static const _colors = [
+    Color(0xFF1DB954),
+    Color(0xFF6750A4),
+    Color(0xFF0061A4),
+    Color(0xFF006E1C),
+    Color(0xFFBA1A1A),
+    Color(0xFF984061),
+    Color(0xFF7D5260),
+    Color(0xFF006874),
+  ];
+
+  @override
+  Widget build(BuildContext context) {
+    return SingleChildScrollView(
+      scrollDirection: Axis.horizontal,
+      child: Row(
+        children: _colors.map((color) {
+          final isSelected = color.toARGB32() == currentColor;
+          return Padding(
+            padding: const EdgeInsets.only(right: 12),
+            child: GestureDetector(
+              onTap: () => onColorSelected(color),
+              child: _ColorPaletteItem(color: color, isSelected: isSelected),
+            ),
+          );
+        }).toList(),
+      ),
+    );
+  }
+}
+
+class _ColorPaletteItem extends StatelessWidget {
+  final Color color;
+  final bool isSelected;
+
+  const _ColorPaletteItem({required this.color, required this.isSelected});
+
+  @override
+  Widget build(BuildContext context) {
+    final scheme = ColorScheme.fromSeed(
+      seedColor: color,
+      brightness: Theme.of(context).brightness,
+    );
+    final size = 64.0;
+
+    return Stack(
+      children: [
+        Container(
+          width: size,
+          height: size,
+          decoration: BoxDecoration(borderRadius: BorderRadius.circular(20)),
+          clipBehavior: Clip.antiAlias,
+          child: Column(
+            children: [
+              Expanded(
+                child: Row(
+                  children: [
+                    Expanded(child: Container(color: scheme.primaryContainer)),
+                    Expanded(child: Container(color: scheme.tertiaryContainer)),
+                  ],
+                ),
+              ),
+              Expanded(
+                child: Row(
+                  children: [
+                    Expanded(
+                      child: Container(color: scheme.secondaryContainer),
+                    ),
+                    Expanded(child: Container(color: scheme.surfaceContainer)),
+                  ],
+                ),
+              ),
+            ],
+          ),
+        ),
+        if (isSelected)
+          Positioned.fill(
+            child: Center(
+              child: Container(
+                padding: const EdgeInsets.all(4),
+                decoration: const BoxDecoration(
+                  color: Colors.white,
+                  shape: BoxShape.circle,
+                ),
+                child: Icon(Icons.check, size: 16, color: scheme.primary),
+              ),
+            ),
+          ),
+      ],
+    );
+  }
+}
+
 /// Optimized app bar title with animation
 class _AppBarTitle extends StatelessWidget {
  final String title;
  final double topPadding;
-  
+
  const _AppBarTitle({required this.title, required this.topPadding});

  @override
@@ -110,7 +414,9 @@ class _AppBarTitle extends StatelessWidget {
      builder: (context, constraints) {
        final maxHeight = 120 + topPadding;
        final minHeight = kToolbarHeight + topPadding;
-        final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
+        final expandRatio =
+            ((constraints.maxHeight - minHeight) / (maxHeight - minHeight))
+                .clamp(0.0, 1.0);
        final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
        return FlexibleSpaceBar(
          expandedTitleScale: 1.0,
@@ -132,19 +438,39 @@ class _AppBarTitle extends StatelessWidget {
 class _ThemeModeSelector extends StatelessWidget {
  final ThemeMode currentMode;
  final ValueChanged<ThemeMode> onChanged;
-  const _ThemeModeSelector({required this.currentMode, required this.onChanged});
+  const _ThemeModeSelector({
+    required this.currentMode,
+    required this.onChanged,
+  });

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(12),
-      child: Row(children: [
-        _ThemeModeChip(icon: Icons.brightness_auto, label: 'System', isSelected: currentMode == ThemeMode.system, onTap: () => onChanged(ThemeMode.system)),
-        const SizedBox(width: 8),
-        _ThemeModeChip(icon: Icons.light_mode, label: 'Light', isSelected: currentMode == ThemeMode.light, onTap: () => onChanged(ThemeMode.light)),
-        const SizedBox(width: 8),
-        _ThemeModeChip(icon: Icons.dark_mode, label: 'Dark', isSelected: currentMode == ThemeMode.dark, onTap: () => onChanged(ThemeMode.dark)),
-      ]),
+      child: Row(
+        children: [
+          _ThemeModeChip(
+            icon: Icons.brightness_auto,
+            label: 'System',
+            isSelected: currentMode == ThemeMode.system,
+            onTap: () => onChanged(ThemeMode.system),
+          ),
+          const SizedBox(width: 8),
+          _ThemeModeChip(
+            icon: Icons.light_mode,
+            label: 'Light',
+            isSelected: currentMode == ThemeMode.light,
+            onTap: () => onChanged(ThemeMode.light),
+          ),
+          const SizedBox(width: 8),
+          _ThemeModeChip(
+            icon: Icons.dark_mode,
+            label: 'Dark',
+            isSelected: currentMode == ThemeMode.dark,
+            onTap: () => onChanged(ThemeMode.dark),
+          ),
+        ],
+      ),
    );
  }
 }
@@ -154,27 +480,41 @@ class _ThemeModeChip extends StatelessWidget {
  final String label;
  final bool isSelected;
  final VoidCallback onTap;
-  const _ThemeModeChip({required this.icon, required this.label, required this.isSelected, required this.onTap});
+  const _ThemeModeChip({
+    required this.icon,
+    required this.label,
+    required this.isSelected,
+    required this.onTap,
+  });

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final isDark = Theme.of(context).brightness == Brightness.dark;
-    
+
    // Unselected chips need contrast with card background
    // Card uses: dark = white 8% overlay, light = surfaceContainerHighest
    // So chips use: dark = white 5% overlay (darker), light = black 5% overlay (darker than card)
-    final unselectedColor = isDark 
-        ? Color.alphaBlend(Colors.white.withValues(alpha: 0.05), colorScheme.surface)
-        : Color.alphaBlend(Colors.black.withValues(alpha: 0.05), colorScheme.surfaceContainerHighest);
-    
+    final unselectedColor = isDark
+        ? Color.alphaBlend(
+            Colors.white.withValues(alpha: 0.05),
+            colorScheme.surface,
+          )
+        : Color.alphaBlend(
+            Colors.black.withValues(alpha: 0.05),
+            colorScheme.surfaceContainerHighest,
+          );
+
    return Expanded(
      child: Container(
        decoration: BoxDecoration(
          color: isSelected ? colorScheme.primaryContainer : unselectedColor,
          borderRadius: BorderRadius.circular(12),
-          border: !isDark && !isSelected 
-              ? Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5), width: 1)
+          border: !isDark && !isSelected
+              ? Border.all(
+                  color: colorScheme.outlineVariant.withValues(alpha: 0.5),
+                  width: 1,
+                )
              : null,
        ),
        child: Material(
@@ -185,13 +525,29 @@ class _ThemeModeChip extends StatelessWidget {
            borderRadius: BorderRadius.circular(12),
            child: Padding(
              padding: const EdgeInsets.symmetric(vertical: 14),
-              child: Column(children: [
-                Icon(icon, color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant),
-                const SizedBox(height: 6),
-                Text(label, style: TextStyle(fontSize: 12,
-                  fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
-                  color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant)),
-              ]),
+              child: Column(
+                children: [
+                  Icon(
+                    icon,
+                    color: isSelected
+                        ? colorScheme.onPrimaryContainer
+                        : colorScheme.onSurfaceVariant,
+                  ),
+                  const SizedBox(height: 6),
+                  Text(
+                    label,
+                    style: TextStyle(
+                      fontSize: 12,
+                      fontWeight: isSelected
+                          ? FontWeight.w600
+                          : FontWeight.normal,
+                      color: isSelected
+                          ? colorScheme.onPrimaryContainer
+                          : colorScheme.onSurfaceVariant,
+                    ),
+                  ),
+                ],
+              ),
            ),
          ),
        ),
@@ -200,49 +556,13 @@ class _ThemeModeChip extends StatelessWidget {
  }
 }

-class _ColorPicker extends StatelessWidget {
-  final int currentColor;
-  final ValueChanged<Color> onColorSelected;
-  const _ColorPicker({required this.currentColor, required this.onColorSelected});
-
-  static const _colors = [
-    Color(0xFF1DB954), Color(0xFF6750A4), Color(0xFF0061A4), Color(0xFF006E1C),
-    Color(0xFFBA1A1A), Color(0xFF984061), Color(0xFF7D5260), Color(0xFF006874), Color(0xFFFF6F00),
-  ];
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Padding(
-      padding: const EdgeInsets.fromLTRB(20, 8, 20, 16),
-      child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
-        Text('Accent Color', style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant)),
-        const SizedBox(height: 12),
-        Wrap(spacing: 12, runSpacing: 12, children: _colors.map((color) {
-          final isSelected = color.toARGB32() == currentColor;
-          return GestureDetector(
-            onTap: () => onColorSelected(color),
-            child: AnimatedContainer(
-              duration: const Duration(milliseconds: 200),
-              width: 44, height: 44,
-              decoration: BoxDecoration(
-                color: color, shape: BoxShape.circle,
-                border: isSelected ? Border.all(color: colorScheme.onSurface, width: 3) : null,
-                boxShadow: isSelected ? [BoxShadow(color: color.withValues(alpha: 0.4), blurRadius: 8, spreadRadius: 2)] : null,
-              ),
-              child: isSelected ? const Icon(Icons.check, color: Colors.white, size: 20) : null,
-            ),
-          );
-        }).toList()),
-      ]),
-    );
-  }
-}
-
 class _HistoryViewSelector extends StatelessWidget {
  final String currentMode;
  final ValueChanged<String> onChanged;
-  const _HistoryViewSelector({required this.currentMode, required this.onChanged});
+  const _HistoryViewSelector({
+    required this.currentMode,
+    required this.onChanged,
+  });

  @override
  Widget build(BuildContext context) {
@@ -254,13 +574,30 @@ class _HistoryViewSelector extends StatelessWidget {
        children: [
          Padding(
            padding: const EdgeInsets.only(left: 8, bottom: 8),
-            child: Text('History View', style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant)),
+            child: Text(
+              'History View',
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                color: colorScheme.onSurfaceVariant,
+              ),
+            ),
+          ),
+          Row(
+            children: [
+              _ViewModeChip(
+                icon: Icons.view_list,
+                label: 'List',
+                isSelected: currentMode == 'list',
+                onTap: () => onChanged('list'),
+              ),
+              const SizedBox(width: 8),
+              _ViewModeChip(
+                icon: Icons.grid_view,
+                label: 'Grid',
+                isSelected: currentMode == 'grid',
+                onTap: () => onChanged('grid'),
+              ),
+            ],
          ),
-          Row(children: [
-            _ViewModeChip(icon: Icons.view_list, label: 'List', isSelected: currentMode == 'list', onTap: () => onChanged('list')),
-            const SizedBox(width: 8),
-            _ViewModeChip(icon: Icons.grid_view, label: 'Grid', isSelected: currentMode == 'grid', onTap: () => onChanged('grid')),
-          ]),
        ],
      ),
    );
@@ -272,25 +609,39 @@ class _ViewModeChip extends StatelessWidget {
  final String label;
  final bool isSelected;
  final VoidCallback onTap;
-  const _ViewModeChip({required this.icon, required this.label, required this.isSelected, required this.onTap});
+  const _ViewModeChip({
+    required this.icon,
+    required this.label,
+    required this.isSelected,
+    required this.onTap,
+  });

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final isDark = Theme.of(context).brightness == Brightness.dark;
-    
+
    // Unselected chips need contrast with card background
-    final unselectedColor = isDark 
-        ? Color.alphaBlend(Colors.white.withValues(alpha: 0.05), colorScheme.surface)
-        : Color.alphaBlend(Colors.black.withValues(alpha: 0.05), colorScheme.surfaceContainerHighest);
-    
+    final unselectedColor = isDark
+        ? Color.alphaBlend(
+            Colors.white.withValues(alpha: 0.05),
+            colorScheme.surface,
+          )
+        : Color.alphaBlend(
+            Colors.black.withValues(alpha: 0.05),
+            colorScheme.surfaceContainerHighest,
+          );
+
    return Expanded(
      child: Container(
        decoration: BoxDecoration(
          color: isSelected ? colorScheme.primaryContainer : unselectedColor,
          borderRadius: BorderRadius.circular(12),
-          border: !isDark && !isSelected 
-              ? Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5), width: 1)
+          border: !isDark && !isSelected
+              ? Border.all(
+                  color: colorScheme.outlineVariant.withValues(alpha: 0.5),
+                  width: 1,
+                )
              : null,
        ),
        child: Material(
@@ -301,13 +652,29 @@ class _ViewModeChip extends StatelessWidget {
            borderRadius: BorderRadius.circular(12),
            child: Padding(
              padding: const EdgeInsets.symmetric(vertical: 14),
-              child: Column(children: [
-                Icon(icon, color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant),
-                const SizedBox(height: 6),
-                Text(label, style: TextStyle(fontSize: 12,
-                  fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
-                  color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant)),
-              ]),
+              child: Column(
+                children: [
+                  Icon(
+                    icon,
+                    color: isSelected
+                        ? colorScheme.onPrimaryContainer
+                        : colorScheme.onSurfaceVariant,
+                  ),
+                  const SizedBox(height: 6),
+                  Text(
+                    label,
+                    style: TextStyle(
+                      fontSize: 12,
+                      fontWeight: isSelected
+                          ? FontWeight.w600
+                          : FontWeight.normal,
+                      color: isSelected
+                          ? colorScheme.onPrimaryContainer
+                          : colorScheme.onSurfaceVariant,
+                    ),
+                  ),
+                ],
+              ),
            ),
          ),
        ),
@@ -0,0 +1,724 @@
+import 'dart:io';
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:file_picker/file_picker.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/screens/settings/extension_detail_page.dart';
+import 'package:spotiflac_android/screens/settings/provider_priority_page.dart';
+import 'package:spotiflac_android/screens/settings/metadata_provider_priority_page.dart';
+import 'package:spotiflac_android/widgets/settings_group.dart';
+
+class ExtensionsPage extends ConsumerStatefulWidget {
+  const ExtensionsPage({super.key});
+
+  @override
+  ConsumerState<ExtensionsPage> createState() => _ExtensionsPageState();
+}
+
+class _ExtensionsPageState extends ConsumerState<ExtensionsPage> {
+  @override
+  void initState() {
+    super.initState();
+    _initializeExtensions();
+  }
+
+  Future<void> _initializeExtensions() async {
+    final extState = ref.read(extensionProvider);
+    if (!extState.isInitialized) {
+      final appDir = await getApplicationDocumentsDirectory();
+      final extensionsDir = '${appDir.path}/extensions';
+      final dataDir = '${appDir.path}/extension_data';
+      
+      // Create directories if they don't exist
+      await Directory(extensionsDir).create(recursive: true);
+      await Directory(dataDir).create(recursive: true);
+      
+      await ref.read(extensionProvider.notifier).initialize(extensionsDir, dataDir);
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final extState = ref.watch(extensionProvider);
+    final colorScheme = Theme.of(context).colorScheme;
+    final topPadding = MediaQuery.of(context).padding.top;
+
+    return PopScope(
+      canPop: true, // Always allow back gesture
+      child: Scaffold(
+        body: CustomScrollView(
+          slivers: [
+          // App Bar
+          SliverAppBar(
+            expandedHeight: 120 + topPadding,
+            collapsedHeight: kToolbarHeight,
+            floating: false,
+            pinned: true,
+            backgroundColor: colorScheme.surface,
+            surfaceTintColor: Colors.transparent,
+            leading: IconButton(
+              icon: const Icon(Icons.arrow_back),
+              onPressed: () => Navigator.pop(context),
+            ),
+            flexibleSpace: LayoutBuilder(
+              builder: (context, constraints) {
+                final maxHeight = 120 + topPadding;
+                final minHeight = kToolbarHeight + topPadding;
+                final expandRatio = ((constraints.maxHeight - minHeight) /
+                        (maxHeight - minHeight))
+                    .clamp(0.0, 1.0);
+                final leftPadding = 56 - (32 * expandRatio);
+                return FlexibleSpaceBar(
+                  expandedTitleScale: 1.0,
+                  titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+                  title: Text(
+                    'Extensions',
+                    style: TextStyle(
+                      fontSize: 20 + (8 * expandRatio),
+                      fontWeight: FontWeight.bold,
+                      color: colorScheme.onSurface,
+                    ),
+                  ),
+                );
+              },
+            ),
+          ),
+
+          // Loading indicator
+          if (extState.isLoading)
+            const SliverToBoxAdapter(
+              child: Padding(
+                padding: EdgeInsets.all(32),
+                child: Center(child: CircularProgressIndicator()),
+              ),
+            ),
+
+          // Error message
+          if (extState.error != null)
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Container(
+                  padding: const EdgeInsets.all(12),
+                  decoration: BoxDecoration(
+                    color: colorScheme.errorContainer,
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                  child: Row(
+                    children: [
+                      Icon(Icons.error_outline, color: colorScheme.error),
+                      const SizedBox(width: 12),
+                      Expanded(
+                        child: Text(
+                          extState.error!,
+                          style: TextStyle(color: colorScheme.onErrorContainer),
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+            ),
+
+          // Provider Priority
+          const SliverToBoxAdapter(
+            child: SettingsSectionHeader(title: 'Provider Priority'),
+          ),
+          SliverToBoxAdapter(
+            child: SettingsGroup(
+              children: [
+                _DownloadPriorityItem(),
+                _MetadataPriorityItem(),
+                _SearchProviderSelector(),
+              ],
+            ),
+          ),
+
+          // Installed Extensions
+          const SliverToBoxAdapter(
+            child: SettingsSectionHeader(title: 'Installed Extensions'),
+          ),
+
+          if (extState.extensions.isEmpty && !extState.isLoading)
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.symmetric(horizontal: 16),
+                child: Container(
+                  padding: const EdgeInsets.all(24),
+                  decoration: BoxDecoration(
+                    color: colorScheme.surfaceContainerHighest.withValues(alpha: 0.3),
+                    borderRadius: BorderRadius.circular(16),
+                  ),
+                  child: Column(
+                    children: [
+                      Icon(
+                        Icons.extension_outlined,
+                        size: 48,
+                        color: colorScheme.onSurfaceVariant,
+                      ),
+                      const SizedBox(height: 12),
+                      Text(
+                        'No extensions installed',
+                        style: Theme.of(context).textTheme.titleMedium?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                      const SizedBox(height: 4),
+                      Text(
+                        'Install .spotiflac-ext files to add new providers',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                        textAlign: TextAlign.center,
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+            ),
+
+          if (extState.extensions.isNotEmpty)
+            SliverToBoxAdapter(
+              child: SettingsGroup(
+                children: extState.extensions.asMap().entries.map((entry) {
+                  final index = entry.key;
+                  final ext = entry.value;
+                  return _ExtensionItem(
+                    extension: ext,
+                    showDivider: index < extState.extensions.length - 1,
+                    onTap: () => Navigator.push(
+                      context,
+                      MaterialPageRoute(
+                        builder: (_) => ExtensionDetailPage(extensionId: ext.id),
+                      ),
+                    ),
+                    onToggle: (enabled) => ref
+                        .read(extensionProvider.notifier)
+                        .setExtensionEnabled(ext.id, enabled),
+                  );
+                }).toList(),
+              ),
+            ),
+
+          // Install button
+          SliverToBoxAdapter(
+            child: Padding(
+              padding: const EdgeInsets.all(16),
+              child: FilledButton.icon(
+                onPressed: _installExtension,
+                icon: const Icon(Icons.add),
+                label: const Text('Install Extension'),
+                style: FilledButton.styleFrom(
+                  padding: const EdgeInsets.symmetric(vertical: 16),
+                  shape: RoundedRectangleBorder(
+                    borderRadius: BorderRadius.circular(16),
+                  ),
+                ),
+              ),
+            ),
+          ),
+
+          // Info section
+          SliverToBoxAdapter(
+            child: Padding(
+              padding: const EdgeInsets.fromLTRB(16, 8, 16, 32),
+              child: Container(
+                padding: const EdgeInsets.all(12),
+                decoration: BoxDecoration(
+                  color: colorScheme.tertiaryContainer.withValues(alpha: 0.3),
+                  borderRadius: BorderRadius.circular(12),
+                ),
+                child: Row(
+                  children: [
+                    Icon(Icons.info_outline, size: 20, color: colorScheme.tertiary),
+                    const SizedBox(width: 12),
+                    Expanded(
+                      child: Text(
+                        'Extensions can add new metadata and download providers. '
+                        'Only install extensions from trusted sources.',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onTertiaryContainer,
+                        ),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+          ),
+        ],
+      ),
+    ),
+    );
+  }
+
+  Future<void> _installExtension() async {
+    final result = await FilePicker.platform.pickFiles(
+      type: FileType.any,
+      allowMultiple: false,
+    );
+
+    if (result != null && result.files.isNotEmpty) {
+      final file = result.files.first;
+      if (file.path != null) {
+        if (!file.path!.endsWith('.spotiflac-ext')) {
+          if (mounted) {
+            ScaffoldMessenger.of(context).showSnackBar(
+              const SnackBar(
+                content: Text('Please select a .spotiflac-ext file'),
+              ),
+            );
+          }
+          return;
+        }
+
+        final success = await ref
+            .read(extensionProvider.notifier)
+            .installExtension(file.path!);
+
+        if (mounted) {
+          final extState = ref.read(extensionProvider);
+          String message;
+          if (success) {
+            message = 'Extension installed successfully';
+          } else {
+            // Parse friendly error message
+            message = _getFriendlyErrorMessage(extState.error);
+          }
+          
+          // Clear the error from state to avoid showing it twice (in error container)
+          ref.read(extensionProvider.notifier).clearError();
+          
+          ScaffoldMessenger.of(context).showSnackBar(
+            SnackBar(content: Text(message)),
+          );
+        }
+      }
+    }
+  }
+
+  /// Parse error message to be more user-friendly
+  String _getFriendlyErrorMessage(String? error) {
+    if (error == null) return 'Failed to install extension';
+    
+    String message = error;
+    
+    // Remove PlatformException wrapper if present
+    // Format: PlatformException(ERROR, actual message, null, null)
+    if (message.contains('PlatformException')) {
+      // Try to extract the actual error message
+      final match = RegExp(r'PlatformException\([^,]+,\s*([^,]+(?:,[^,]+)?),').firstMatch(message);
+      if (match != null) {
+        message = match.group(1)?.trim() ?? message;
+      } else {
+        // Fallback: try simpler extraction
+        final simpleMatch = RegExp(r'PlatformException\([^,]+,\s*(.+?),\s*null').firstMatch(message);
+        if (simpleMatch != null) {
+          message = simpleMatch.group(1)?.trim() ?? message;
+        }
+      }
+    }
+    
+    // Clean up any remaining artifacts
+    message = message.replaceAll(RegExp(r',\s*null\s*,\s*null\)?$'), '');
+    message = message.replaceAll(RegExp(r'^\s*,\s*'), '');
+    
+    return message;
+  }
+}
+
+class _ExtensionItem extends StatelessWidget {
+  final Extension extension;
+  final bool showDivider;
+  final VoidCallback onTap;
+  final ValueChanged<bool> onToggle;
+
+  const _ExtensionItem({
+    required this.extension,
+    required this.showDivider,
+    required this.onTap,
+    required this.onToggle,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final hasError = extension.status == 'error';
+
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        InkWell(
+          onTap: onTap,
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+            child: Row(
+              children: [
+                // Extension icon
+                Container(
+                  width: 44,
+                  height: 44,
+                  decoration: BoxDecoration(
+                    color: hasError
+                        ? colorScheme.errorContainer
+                        : colorScheme.primaryContainer,
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                  child: extension.iconPath != null && extension.iconPath!.isNotEmpty
+                      ? ClipRRect(
+                          borderRadius: BorderRadius.circular(12),
+                          child: Image.file(
+                            File(extension.iconPath!),
+                            width: 44,
+                            height: 44,
+                            fit: BoxFit.cover,
+                            errorBuilder: (context, error, stackTrace) => Icon(
+                              hasError ? Icons.error_outline : Icons.extension,
+                              color: hasError
+                                  ? colorScheme.error
+                                  : colorScheme.onPrimaryContainer,
+                            ),
+                          ),
+                        )
+                      : Icon(
+                          hasError ? Icons.error_outline : Icons.extension,
+                          color: hasError
+                              ? colorScheme.error
+                              : colorScheme.onPrimaryContainer,
+                        ),
+                ),
+                const SizedBox(width: 16),
+                // Extension info
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        extension.displayName,
+                        style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                          fontWeight: FontWeight.w500,
+                        ),
+                      ),
+                      const SizedBox(height: 2),
+                      Text(
+                        hasError
+                            ? extension.errorMessage ?? 'Error loading extension'
+                            : 'v${extension.version} by ${extension.author}',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: hasError
+                              ? colorScheme.error
+                              : colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+                // Toggle switch
+                Switch(
+                  value: extension.enabled,
+                  onChanged: hasError ? null : onToggle,
+                ),
+              ],
+            ),
+          ),
+        ),
+        if (showDivider)
+          Divider(
+            height: 1,
+            thickness: 1,
+            indent: 76,
+            endIndent: 16,
+            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+          ),
+      ],
+    );
+  }
+}
+
+class _DownloadPriorityItem extends ConsumerWidget {
+  const _DownloadPriorityItem();
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final extState = ref.watch(extensionProvider);
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    // Check if any extension has download provider
+    final hasDownloadExtensions = extState.extensions
+        .any((e) => e.enabled && e.hasDownloadProvider);
+    
+    return InkWell(
+      onTap: hasDownloadExtensions 
+          ? () => Navigator.push(
+              context,
+              MaterialPageRoute(
+                builder: (_) => const ProviderPriorityPage(),
+              ),
+            )
+          : null,
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+        child: Row(
+          children: [
+            Icon(
+              Icons.download,
+              color: hasDownloadExtensions 
+                  ? colorScheme.onSurfaceVariant 
+                  : colorScheme.outline,
+            ),
+            const SizedBox(width: 16),
+            Expanded(
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Text(
+                    'Download Priority',
+                    style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                      color: hasDownloadExtensions 
+                          ? null 
+                          : colorScheme.outline,
+                    ),
+                  ),
+                  const SizedBox(height: 2),
+                  Text(
+                    hasDownloadExtensions 
+                        ? 'Set download service order'
+                        : 'No extensions with download provider',
+                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: colorScheme.onSurfaceVariant,
+                    ),
+                  ),
+                ],
+              ),
+            ),
+            Icon(
+              Icons.chevron_right,
+              color: hasDownloadExtensions 
+                  ? colorScheme.onSurfaceVariant 
+                  : colorScheme.outline,
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _MetadataPriorityItem extends ConsumerWidget {
+  const _MetadataPriorityItem();
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final extState = ref.watch(extensionProvider);
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    // Check if any extension has metadata provider
+    final hasMetadataExtensions = extState.extensions
+        .any((e) => e.enabled && e.hasMetadataProvider);
+    
+    return InkWell(
+      onTap: hasMetadataExtensions 
+          ? () => Navigator.push(
+              context,
+              MaterialPageRoute(
+                builder: (_) => const MetadataProviderPriorityPage(),
+              ),
+            )
+          : null,
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+        child: Row(
+          children: [
+            Icon(
+              Icons.search,
+              color: hasMetadataExtensions 
+                  ? colorScheme.onSurfaceVariant 
+                  : colorScheme.outline,
+            ),
+            const SizedBox(width: 16),
+            Expanded(
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Text(
+                    'Metadata Priority',
+                    style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                      color: hasMetadataExtensions 
+                          ? null 
+                          : colorScheme.outline,
+                    ),
+                  ),
+                  const SizedBox(height: 2),
+                  Text(
+                    hasMetadataExtensions 
+                        ? 'Set search & metadata source order'
+                        : 'No extensions with metadata provider',
+                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: colorScheme.onSurfaceVariant,
+                    ),
+                  ),
+                ],
+              ),
+            ),
+            Icon(
+              Icons.chevron_right,
+              color: hasMetadataExtensions 
+                  ? colorScheme.onSurfaceVariant 
+                  : colorScheme.outline,
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _SearchProviderSelector extends ConsumerWidget {
+  const _SearchProviderSelector();
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final settings = ref.watch(settingsProvider);
+    final extState = ref.watch(extensionProvider);
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    // Get extensions with custom search
+    final searchProviders = extState.extensions
+        .where((e) => e.enabled && e.hasCustomSearch)
+        .toList();
+    
+    // Get current provider name
+    String currentProviderName = 'Default (Deezer/Spotify)';
+    if (settings.searchProvider != null && settings.searchProvider!.isNotEmpty) {
+      final ext = searchProviders.where((e) => e.id == settings.searchProvider).firstOrNull;
+      currentProviderName = ext?.displayName ?? settings.searchProvider!;
+    }
+    
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        InkWell(
+          onTap: searchProviders.isEmpty 
+              ? null 
+              : () => _showSearchProviderPicker(context, ref, settings, searchProviders),
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+            child: Row(
+              children: [
+                Icon(
+                  Icons.manage_search,
+                  color: searchProviders.isEmpty 
+                      ? colorScheme.outline 
+                      : colorScheme.onSurfaceVariant,
+                ),
+                const SizedBox(width: 16),
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        'Search Provider',
+                        style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                          color: searchProviders.isEmpty 
+                              ? colorScheme.outline 
+                              : null,
+                        ),
+                      ),
+                      const SizedBox(height: 2),
+                      Text(
+                        searchProviders.isEmpty 
+                            ? 'No extensions with custom search'
+                            : currentProviderName,
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+                Icon(
+                  Icons.chevron_right,
+                  color: searchProviders.isEmpty 
+                      ? colorScheme.outline 
+                      : colorScheme.onSurfaceVariant,
+                ),
+              ],
+            ),
+          ),
+        ),
+      ],
+    );
+  }
+
+  void _showSearchProviderPicker(
+    BuildContext context,
+    WidgetRef ref,
+    dynamic settings,
+    List<Extension> searchProviders,
+  ) {
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    showModalBottomSheet(
+      context: context,
+      backgroundColor: colorScheme.surfaceContainerHigh,
+      shape: const RoundedRectangleBorder(
+        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
+      ),
+      builder: (ctx) => SafeArea(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 24, 24, 8),
+              child: Text(
+                'Search Provider',
+                style: Theme.of(context).textTheme.titleLarge?.copyWith(
+                  fontWeight: FontWeight.bold,
+                ),
+              ),
+            ),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 0, 24, 16),
+              child: Text(
+                'Choose which service to use for searching tracks',
+                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                  color: colorScheme.onSurfaceVariant,
+                ),
+              ),
+            ),
+            // Default option
+            ListTile(
+              leading: Icon(Icons.music_note, color: colorScheme.primary),
+              title: const Text('Default (Deezer/Spotify)'),
+              subtitle: const Text('Use built-in search'),
+              trailing: (settings.searchProvider == null || settings.searchProvider!.isEmpty)
+                  ? Icon(Icons.check_circle, color: colorScheme.primary)
+                  : Icon(Icons.circle_outlined, color: colorScheme.outline),
+              onTap: () {
+                ref.read(settingsProvider.notifier).setSearchProvider(null);
+                Navigator.pop(ctx);
+              },
+            ),
+            // Extension options
+            ...searchProviders.map((ext) => ListTile(
+              leading: Icon(Icons.extension, color: colorScheme.secondary),
+              title: Text(ext.displayName),
+              subtitle: Text(ext.searchBehavior?.placeholder ?? 'Custom search'),
+              trailing: settings.searchProvider == ext.id
+                  ? Icon(Icons.check_circle, color: colorScheme.primary)
+                  : Icon(Icons.circle_outlined, color: colorScheme.outline),
+              onTap: () {
+                ref.read(settingsProvider.notifier).setSearchProvider(ext.id);
+                Navigator.pop(ctx);
+              },
+            )),
+            const SizedBox(height: 16),
+          ],
+        ),
+      ),
+    );
+  }
+}
@@ -0,0 +1,801 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:share_plus/share_plus.dart' show ShareParams, SharePlus;
+import 'package:spotiflac_android/utils/logger.dart';
+import 'package:spotiflac_android/widgets/settings_group.dart';
+
+class LogScreen extends StatefulWidget {
+  const LogScreen({super.key});
+
+  @override
+  State<LogScreen> createState() => _LogScreenState();
+}
+
+class _LogScreenState extends State<LogScreen> {
+  final ScrollController _scrollController = ScrollController();
+  final TextEditingController _searchController = TextEditingController();
+  String _selectedLevel = 'ALL';
+  String _searchQuery = '';
+  bool _autoScroll = true;
+
+  final List<String> _levels = ['ALL', 'DEBUG', 'INFO', 'WARN', 'ERROR'];
+
+  @override
+  void initState() {
+    super.initState();
+    LogBuffer().addListener(_onLogUpdate);
+    // Start polling Go backend logs
+    LogBuffer().startGoLogPolling();
+  }
+
+  @override
+  void dispose() {
+    LogBuffer().removeListener(_onLogUpdate);
+    // Stop polling when leaving screen
+    LogBuffer().stopGoLogPolling();
+    _scrollController.dispose();
+    _searchController.dispose();
+    super.dispose();
+  }
+
+  void _onLogUpdate() {
+    if (mounted) {
+      setState(() {});
+      if (_autoScroll && _scrollController.hasClients) {
+        WidgetsBinding.instance.addPostFrameCallback((_) {
+          if (_scrollController.hasClients) {
+            _scrollController.animateTo(
+              _scrollController.position.maxScrollExtent,
+              duration: const Duration(milliseconds: 100),
+              curve: Curves.easeOut,
+            );
+          }
+        });
+      }
+    }
+  }
+
+  List<LogEntry> get _filteredLogs {
+    return LogBuffer().filter(
+      level: _selectedLevel,
+      search: _searchQuery.isEmpty ? null : _searchQuery,
+    );
+  }
+
+  void _copyLogs() {
+    final logs = LogBuffer().export();
+    Clipboard.setData(ClipboardData(text: logs));
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        content: const Text('Logs copied to clipboard'),
+        behavior: SnackBarBehavior.floating,
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+        duration: const Duration(seconds: 2),
+      ),
+    );
+  }
+
+  void _shareLogs() {
+    final logs = LogBuffer().export();
+    SharePlus.instance.share(ShareParams(text: logs, subject: 'SpotiFLAC Logs'));
+  }
+
+  void _clearLogs() {
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Clear Logs'),
+        content: const Text('Are you sure you want to clear all logs?'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () {
+              LogBuffer().clear();
+              Navigator.pop(context);
+            },
+            child: const Text('Clear'),
+          ),
+        ],
+      ),
+    );
+  }
+
+  Color _getLevelColor(String level, ColorScheme colorScheme) {
+    switch (level) {
+      case 'ERROR':
+      case 'FATAL':
+        return colorScheme.error;
+      case 'WARN':
+        return Colors.orange;
+      case 'INFO':
+        return colorScheme.primary;
+      case 'DEBUG':
+      default:
+        return colorScheme.onSurfaceVariant;
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final topPadding = MediaQuery.of(context).padding.top;
+    final logs = _filteredLogs;
+
+    return PopScope(
+      canPop: true, // Always allow back gesture
+      child: Scaffold(
+        body: CustomScrollView(
+          controller: _scrollController,
+          slivers: [
+            // Collapsing App Bar with back button - same as other settings pages
+            SliverAppBar(
+            expandedHeight: 120 + topPadding,
+            collapsedHeight: kToolbarHeight,
+            floating: false,
+            pinned: true,
+            backgroundColor: colorScheme.surface,
+            surfaceTintColor: Colors.transparent,
+            leading: IconButton(
+              icon: const Icon(Icons.arrow_back),
+              onPressed: () => Navigator.pop(context),
+            ),
+            actions: [
+              IconButton(
+                icon: Icon(_autoScroll ? Icons.vertical_align_bottom : Icons.vertical_align_center),
+                tooltip: _autoScroll ? 'Auto-scroll ON' : 'Auto-scroll OFF',
+                onPressed: () => setState(() => _autoScroll = !_autoScroll),
+              ),
+              IconButton(
+                icon: const Icon(Icons.copy),
+                tooltip: 'Copy logs',
+                onPressed: _copyLogs,
+              ),
+              PopupMenuButton<String>(
+                icon: const Icon(Icons.more_vert),
+                onSelected: (value) {
+                  switch (value) {
+                    case 'share':
+                      _shareLogs();
+                      break;
+                    case 'clear':
+                      _clearLogs();
+                      break;
+                  }
+                },
+                itemBuilder: (context) => [
+                  const PopupMenuItem(
+                    value: 'share',
+                    child: ListTile(
+                      leading: Icon(Icons.share),
+                      title: Text('Share logs'),
+                      contentPadding: EdgeInsets.zero,
+                    ),
+                  ),
+                  const PopupMenuItem(
+                    value: 'clear',
+                    child: ListTile(
+                      leading: Icon(Icons.delete_outline),
+                        title: Text('Clear logs'),
+                        contentPadding: EdgeInsets.zero,
+                      ),
+                    ),
+                  ],
+                ),
+              ],
+              flexibleSpace: LayoutBuilder(
+                builder: (context, constraints) {
+                  final maxHeight = 120 + topPadding;
+                  final minHeight = kToolbarHeight + topPadding;
+                  final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
+                  final leftPadding = 56 - (32 * expandRatio);
+                  return FlexibleSpaceBar(
+                    expandedTitleScale: 1.0,
+                    titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+                    title: Text(
+                      'Logs',
+                      style: TextStyle(
+                        fontSize: 20 + (8 * expandRatio),
+                        fontWeight: FontWeight.bold,
+                        color: colorScheme.onSurface,
+                      ),
+                    ),
+                  );
+                },
+              ),
+            ),
+
+            // Filter section
+            const SliverToBoxAdapter(
+              child: SettingsSectionHeader(title: 'Filter'),
+            ),
+            SliverToBoxAdapter(
+              child: SettingsGroup(
+                children: [
+                  // Level filter
+                  Padding(
+                    padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
+                    child: Row(
+                      children: [
+                        Icon(Icons.filter_list, color: colorScheme.onSurfaceVariant),
+                        const SizedBox(width: 16),
+                        Expanded(
+                          child: Column(
+                            crossAxisAlignment: CrossAxisAlignment.start,
+                            children: [
+                              Text('Level', style: Theme.of(context).textTheme.bodyLarge),
+                              const SizedBox(height: 2),
+                              Text(
+                                'Filter logs by severity',
+                                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                                  color: colorScheme.onSurfaceVariant,
+                                ),
+                              ),
+                            ],
+                          ),
+                        ),
+                        DropdownButton<String>(
+                          value: _selectedLevel,
+                          underline: const SizedBox(),
+                          items: _levels.map((level) {
+                            return DropdownMenuItem(
+                              value: level,
+                              child: Text(
+                                level,
+                                style: TextStyle(
+                                  color: level == 'ALL' 
+                                      ? colorScheme.onSurface 
+                                      : _getLevelColor(level, colorScheme),
+                                  fontWeight: FontWeight.w500,
+                                ),
+                              ),
+                            );
+                          }).toList(),
+                          onChanged: (value) {
+                            if (value != null) {
+                              setState(() => _selectedLevel = value);
+                            }
+                          },
+                        ),
+                      ],
+                    ),
+                  ),
+                  Divider(
+                    height: 1,
+                    indent: 56,
+                    endIndent: 20,
+                    color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+                  ),
+                  // Search field
+                  Padding(
+                    padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
+                    child: Row(
+                      children: [
+                        Icon(Icons.search, color: colorScheme.onSurfaceVariant),
+                        const SizedBox(width: 16),
+                        Expanded(
+                          child: TextField(
+                            controller: _searchController,
+                            decoration: InputDecoration(
+                              hintText: 'Search logs...',
+                              isDense: true,
+                              contentPadding: const EdgeInsets.symmetric(
+                                horizontal: 16,
+                                vertical: 12,
+                              ),
+                              border: OutlineInputBorder(
+                                borderRadius: BorderRadius.circular(12),
+                                borderSide: BorderSide.none,
+                              ),
+                              filled: true,
+                              fillColor: colorScheme.surfaceContainerHighest,
+                              suffixIcon: _searchQuery.isNotEmpty
+                                  ? IconButton(
+                                      icon: const Icon(Icons.clear, size: 20),
+                                      onPressed: () {
+                                        _searchController.clear();
+                                        setState(() => _searchQuery = '');
+                                      },
+                                    )
+                                  : null,
+                            ),
+                            onChanged: (value) {
+                              setState(() => _searchQuery = value);
+                            },
+                          ),
+                        ),
+                      ],
+                    ),
+                  ),
+                ],
+              ),
+            ),
+
+            // Log entries section
+            SliverToBoxAdapter(
+              child: SettingsSectionHeader(
+                title: 'Entries (${logs.length}${_selectedLevel != 'ALL' || _searchQuery.isNotEmpty ? ' filtered' : ''})',
+              ),
+            ),
+            
+            // Error summary card - shows detected issues
+            SliverToBoxAdapter(
+              child: _LogSummaryCard(logs: LogBuffer().entries),
+            ),
+            
+            // Log list
+            logs.isEmpty
+                ? SliverToBoxAdapter(
+                    child: SettingsGroup(
+                      children: [
+                        Padding(
+                          padding: const EdgeInsets.symmetric(vertical: 48),
+                          child: Column(
+                            mainAxisSize: MainAxisSize.min,
+                            children: [
+                              Icon(
+                                Icons.article_outlined,
+                                size: 48,
+                                color: colorScheme.onSurfaceVariant.withValues(alpha: 0.5),
+                              ),
+                              const SizedBox(height: 16),
+                              Text(
+                                'No logs yet',
+                                style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                                  color: colorScheme.onSurfaceVariant,
+                                ),
+                              ),
+                              const SizedBox(height: 4),
+                              Text(
+                                'Logs will appear here as you use the app',
+                                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                                  color: colorScheme.onSurfaceVariant.withValues(alpha: 0.7),
+                                ),
+                              ),
+                            ],
+                          ),
+                        ),
+                      ],
+                    ),
+                  )
+                : SliverToBoxAdapter(
+                    child: SettingsGroup(
+                      children: [
+                        ...logs.asMap().entries.map((entry) {
+                          final index = entry.key;
+                          final log = entry.value;
+                          return _LogEntryTile(
+                            entry: log,
+                            levelColor: _getLevelColor(log.level, colorScheme),
+                            showDivider: index < logs.length - 1,
+                          );
+                        }),
+                      ],
+                    ),
+                  ),
+
+            // Bottom padding
+            const SliverToBoxAdapter(child: SizedBox(height: 32)),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _LogEntryTile extends StatelessWidget {
+  final LogEntry entry;
+  final Color levelColor;
+  final bool showDivider;
+
+  const _LogEntryTile({
+    required this.entry,
+    required this.levelColor,
+    this.showDivider = true,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isError = entry.level == 'ERROR' || entry.level == 'FATAL';
+
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        Container(
+          width: double.infinity,
+          padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
+          decoration: BoxDecoration(
+            color: isError 
+                ? colorScheme.errorContainer.withValues(alpha: 0.2)
+                : null,
+          ),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              // Header: time, level, tag
+              Row(
+                children: [
+                  Text(
+                    entry.formattedTime,
+                    style: TextStyle(
+                      fontSize: 11,
+                      fontFamily: 'monospace',
+                      color: colorScheme.onSurfaceVariant,
+                    ),
+                  ),
+                  const SizedBox(width: 8),
+                  Container(
+                    padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+                    decoration: BoxDecoration(
+                      color: levelColor.withValues(alpha: 0.15),
+                      borderRadius: BorderRadius.circular(6),
+                    ),
+                    child: Text(
+                      entry.level,
+                      style: TextStyle(
+                        fontSize: 10,
+                        fontWeight: FontWeight.bold,
+                        color: levelColor,
+                      ),
+                    ),
+                  ),
+                  if (entry.isFromGo) ...[
+                    const SizedBox(width: 4),
+                    Container(
+                      padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
+                      decoration: BoxDecoration(
+                        color: Colors.teal.withValues(alpha: 0.15),
+                        borderRadius: BorderRadius.circular(4),
+                      ),
+                      child: const Text(
+                        'Go',
+                        style: TextStyle(
+                          fontSize: 9,
+                          fontWeight: FontWeight.bold,
+                          color: Colors.teal,
+                        ),
+                      ),
+                    ),
+                  ],
+                  const SizedBox(width: 8),
+                  Expanded(
+                    child: Text(
+                      entry.tag,
+                      style: TextStyle(
+                        fontSize: 11,
+                        fontWeight: FontWeight.w600,
+                        color: colorScheme.primary,
+                      ),
+                      overflow: TextOverflow.ellipsis,
+                    ),
+                  ),
+                ],
+              ),
+              const SizedBox(height: 6),
+              // Message
+              Text(
+                entry.message,
+                style: TextStyle(
+                  fontSize: 13,
+                  fontFamily: 'monospace',
+                  color: colorScheme.onSurface,
+                  height: 1.4,
+                ),
+              ),
+              // Error if present
+              if (entry.error != null) ...[
+                const SizedBox(height: 4),
+                Text(
+                  entry.error!,
+                  style: TextStyle(
+                    fontSize: 12,
+                    fontFamily: 'monospace',
+                    color: colorScheme.error,
+                    height: 1.3,
+                  ),
+                ),
+              ],
+            ],
+          ),
+        ),
+        if (showDivider)
+          Divider(
+            height: 1,
+            indent: 20,
+            endIndent: 20,
+            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+          ),
+      ],
+    );
+  }
+}
+
+/// Summary card showing detected issues in logs
+class _LogSummaryCard extends StatelessWidget {
+  final List<LogEntry> logs;
+
+  const _LogSummaryCard({required this.logs});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    // Analyze logs for issues
+    final analysis = _analyzeLogs();
+    
+    // Don't show if no issues detected
+    if (!analysis.hasIssues) {
+      return const SizedBox.shrink();
+    }
+
+    return Padding(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
+      child: Card(
+        elevation: 0,
+        color: analysis.hasISPBlocking 
+            ? colorScheme.errorContainer.withValues(alpha: 0.5)
+            : colorScheme.tertiaryContainer.withValues(alpha: 0.5),
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+        child: Padding(
+          padding: const EdgeInsets.all(16),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              // Header
+              Row(
+                children: [
+                  Icon(
+                    analysis.hasISPBlocking ? Icons.block : Icons.warning_amber_rounded,
+                    size: 20,
+                    color: analysis.hasISPBlocking ? colorScheme.error : colorScheme.tertiary,
+                  ),
+                  const SizedBox(width: 8),
+                  Text(
+                    'Issue Summary',
+                    style: Theme.of(context).textTheme.titleSmall?.copyWith(
+                      fontWeight: FontWeight.bold,
+                      color: colorScheme.onSurface,
+                    ),
+                  ),
+                ],
+              ),
+              const SizedBox(height: 12),
+              
+              // ISP Blocking detected
+              if (analysis.hasISPBlocking) ...[
+                _IssueBadge(
+                  icon: Icons.block,
+                  label: 'ISP BLOCKING DETECTED',
+                  description: 'Your ISP may be blocking access to download services',
+                  suggestion: 'Try using a VPN or change DNS to 1.1.1.1 or 8.8.8.8',
+                  color: colorScheme.error,
+                  domains: analysis.blockedDomains,
+                ),
+                const SizedBox(height: 8),
+              ],
+              
+              // Rate limiting
+              if (analysis.hasRateLimit) ...[
+                _IssueBadge(
+                  icon: Icons.speed,
+                  label: 'RATE LIMITED',
+                  description: 'Too many requests to the service',
+                  suggestion: 'Wait a few minutes before trying again',
+                  color: Colors.orange,
+                ),
+                const SizedBox(height: 8),
+              ],
+              
+              // Network errors
+              if (analysis.hasNetworkError && !analysis.hasISPBlocking) ...[
+                _IssueBadge(
+                  icon: Icons.wifi_off,
+                  label: 'NETWORK ERROR',
+                  description: 'Connection issues detected',
+                  suggestion: 'Check your internet connection',
+                  color: colorScheme.tertiary,
+                ),
+                const SizedBox(height: 8),
+              ],
+              
+              // Track not found
+              if (analysis.hasNotFound) ...[
+                _IssueBadge(
+                  icon: Icons.search_off,
+                  label: 'TRACK NOT FOUND',
+                  description: 'Some tracks could not be found on download services',
+                  suggestion: 'The track may not be available in lossless quality',
+                  color: colorScheme.onSurfaceVariant,
+                ),
+              ],
+              
+              // Error count
+              const SizedBox(height: 12),
+              Text(
+                'Total errors: ${analysis.errorCount}',
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                  color: colorScheme.onSurfaceVariant,
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  _LogAnalysis _analyzeLogs() {
+    int errorCount = 0;
+    bool hasISPBlocking = false;
+    bool hasRateLimit = false;
+    bool hasNetworkError = false;
+    bool hasNotFound = false;
+    final Set<String> blockedDomains = {};
+
+    for (final log in logs) {
+      if (log.level == 'ERROR' || log.level == 'FATAL') {
+        errorCount++;
+      }
+
+      final msgLower = log.message.toLowerCase();
+      final errorLower = (log.error ?? '').toLowerCase();
+      final combined = '$msgLower $errorLower';
+
+      // Check for ISP blocking (detected by Go backend)
+      if (combined.contains('isp blocking') ||
+          combined.contains('isp may be') ||
+          combined.contains('blocked by isp') ||
+          combined.contains('connection reset') ||
+          combined.contains('connection refused')) {
+        hasISPBlocking = true;
+        
+        // Try to extract domain
+        final domainMatch = RegExp(r'domain:\s*([^\s,]+)', caseSensitive: false).firstMatch(combined);
+        if (domainMatch != null) {
+          blockedDomains.add(domainMatch.group(1)!);
+        }
+      }
+
+      // Check for rate limiting
+      if (combined.contains('rate limit') ||
+          combined.contains('429') ||
+          combined.contains('too many requests')) {
+        hasRateLimit = true;
+      }
+
+      // Check for network errors
+      if (combined.contains('connection') ||
+          combined.contains('timeout') ||
+          combined.contains('network') ||
+          combined.contains('dial')) {
+        hasNetworkError = true;
+      }
+
+      // Check for not found
+      if (combined.contains('not found') ||
+          combined.contains('no results') ||
+          combined.contains('could not find')) {
+        hasNotFound = true;
+      }
+    }
+
+    return _LogAnalysis(
+      errorCount: errorCount,
+      hasISPBlocking: hasISPBlocking,
+      hasRateLimit: hasRateLimit,
+      hasNetworkError: hasNetworkError,
+      hasNotFound: hasNotFound,
+      blockedDomains: blockedDomains.toList(),
+    );
+  }
+}
+
+class _LogAnalysis {
+  final int errorCount;
+  final bool hasISPBlocking;
+  final bool hasRateLimit;
+  final bool hasNetworkError;
+  final bool hasNotFound;
+  final List<String> blockedDomains;
+
+  _LogAnalysis({
+    required this.errorCount,
+    required this.hasISPBlocking,
+    required this.hasRateLimit,
+    required this.hasNetworkError,
+    required this.hasNotFound,
+    required this.blockedDomains,
+  });
+
+  bool get hasIssues => errorCount > 0 || hasISPBlocking || hasRateLimit || hasNetworkError || hasNotFound;
+}
+
+class _IssueBadge extends StatelessWidget {
+  final IconData icon;
+  final String label;
+  final String description;
+  final String suggestion;
+  final Color color;
+  final List<String>? domains;
+
+  const _IssueBadge({
+    required this.icon,
+    required this.label,
+    required this.description,
+    required this.suggestion,
+    required this.color,
+    this.domains,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    return Container(
+      width: double.infinity,
+      padding: const EdgeInsets.all(12),
+      decoration: BoxDecoration(
+        color: color.withValues(alpha: 0.1),
+        borderRadius: BorderRadius.circular(8),
+        border: Border.all(color: color.withValues(alpha: 0.3)),
+      ),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Row(
+            children: [
+              Icon(icon, size: 16, color: color),
+              const SizedBox(width: 6),
+              Text(
+                label,
+                style: TextStyle(
+                  fontSize: 12,
+                  fontWeight: FontWeight.bold,
+                  color: color,
+                ),
+              ),
+            ],
+          ),
+          const SizedBox(height: 6),
+          Text(
+            description,
+            style: Theme.of(context).textTheme.bodySmall?.copyWith(
+              color: colorScheme.onSurface,
+            ),
+          ),
+          if (domains != null && domains!.isNotEmpty) ...[
+            const SizedBox(height: 4),
+            Text(
+              'Affected: ${domains!.join(", ")}',
+              style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                color: colorScheme.onSurfaceVariant,
+                fontFamily: 'monospace',
+                fontSize: 11,
+              ),
+            ),
+          ],
+          const SizedBox(height: 6),
+          Row(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Icon(Icons.lightbulb_outline, size: 14, color: colorScheme.primary),
+              const SizedBox(width: 4),
+              Expanded(
+                child: Text(
+                  suggestion,
+                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                    color: colorScheme.primary,
+                    fontStyle: FontStyle.italic,
+                  ),
+                ),
+              ),
+            ],
+          ),
+        ],
+      ),
+    );
+  }
+}
@@ -0,0 +1,366 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+
+class MetadataProviderPriorityPage extends ConsumerStatefulWidget {
+  const MetadataProviderPriorityPage({super.key});
+
+  @override
+  ConsumerState<MetadataProviderPriorityPage> createState() => _MetadataProviderPriorityPageState();
+}
+
+class _MetadataProviderPriorityPageState extends ConsumerState<MetadataProviderPriorityPage> {
+  late List<String> _providers;
+  bool _hasChanges = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _loadProviders();
+  }
+
+  void _loadProviders() {
+    final extState = ref.read(extensionProvider);
+    final allProviders = ref.read(extensionProvider.notifier).getAllMetadataProviders();
+    
+    // Use saved priority if available, otherwise use default order
+    if (extState.metadataProviderPriority.isNotEmpty) {
+      _providers = List.from(extState.metadataProviderPriority);
+      // Add any new providers not in saved priority
+      for (final provider in allProviders) {
+        if (!_providers.contains(provider)) {
+          _providers.add(provider);
+        }
+      }
+      // Remove providers that no longer exist
+      _providers.removeWhere((p) => !allProviders.contains(p));
+    } else {
+      _providers = allProviders;
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final topPadding = MediaQuery.of(context).padding.top;
+
+    return PopScope(
+      canPop: !_hasChanges,
+      onPopInvokedWithResult: (didPop, result) async {
+        if (didPop) return;
+        final shouldPop = await _confirmDiscard(context);
+        if (shouldPop && context.mounted) {
+          Navigator.pop(context);
+        }
+      },
+      child: Scaffold(
+        body: CustomScrollView(
+          slivers: [
+            // App Bar
+            SliverAppBar(
+              expandedHeight: 120 + topPadding,
+              collapsedHeight: kToolbarHeight,
+              floating: false,
+              pinned: true,
+              backgroundColor: colorScheme.surface,
+              surfaceTintColor: Colors.transparent,
+              leading: IconButton(
+                icon: const Icon(Icons.arrow_back),
+                onPressed: () async {
+                  if (_hasChanges) {
+                    final shouldPop = await _confirmDiscard(context);
+                    if (shouldPop && context.mounted) {
+                      Navigator.pop(context);
+                    }
+                  } else {
+                    Navigator.pop(context);
+                  }
+                },
+              ),
+              actions: [
+                if (_hasChanges)
+                  TextButton(
+                    onPressed: _saveChanges,
+                    child: const Text('Save'),
+                  ),
+              ],
+              flexibleSpace: LayoutBuilder(
+                builder: (context, constraints) {
+                  final maxHeight = 120 + topPadding;
+                  final minHeight = kToolbarHeight + topPadding;
+                  final expandRatio = ((constraints.maxHeight - minHeight) /
+                          (maxHeight - minHeight))
+                      .clamp(0.0, 1.0);
+                  final leftPadding = 56 - (32 * expandRatio);
+                  return FlexibleSpaceBar(
+                    expandedTitleScale: 1.0,
+                    titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+                    title: Text(
+                      'Metadata Priority',
+                      style: TextStyle(
+                        fontSize: 20 + (8 * expandRatio),
+                        fontWeight: FontWeight.bold,
+                        color: colorScheme.onSurface,
+                      ),
+                    ),
+                  );
+                },
+              ),
+            ),
+
+            // Description
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Text(
+                  'Drag to reorder metadata providers. The app will try providers '
+                  'from top to bottom when searching for tracks and fetching metadata.',
+                  style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                    color: colorScheme.onSurfaceVariant,
+                  ),
+                ),
+              ),
+            ),
+
+            // Provider list
+            SliverPadding(
+              padding: const EdgeInsets.symmetric(horizontal: 16),
+              sliver: SliverReorderableList(
+                itemCount: _providers.length,
+                itemBuilder: (context, index) {
+                  final provider = _providers[index];
+                  return _MetadataProviderItem(
+                    key: ValueKey(provider),
+                    provider: provider,
+                    index: index,
+                    isFirst: index == 0,
+                    isLast: index == _providers.length - 1,
+                  );
+                },
+                onReorder: (oldIndex, newIndex) {
+                  setState(() {
+                    if (newIndex > oldIndex) {
+                      newIndex -= 1;
+                    }
+                    final item = _providers.removeAt(oldIndex);
+                    _providers.insert(newIndex, item);
+                    _hasChanges = true;
+                  });
+                },
+              ),
+            ),
+
+            // Info section
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Container(
+                  padding: const EdgeInsets.all(12),
+                  decoration: BoxDecoration(
+                    color: colorScheme.tertiaryContainer.withValues(alpha: 0.3),
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                  child: Row(
+                    children: [
+                      Icon(Icons.info_outline, size: 20, color: colorScheme.tertiary),
+                      const SizedBox(width: 12),
+                      Expanded(
+                        child: Text(
+                          'Deezer has no rate limits and is recommended as primary. '
+                          'Spotify may rate limit after many requests.',
+                          style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                            color: colorScheme.onTertiaryContainer,
+                          ),
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+            ),
+
+            const SliverToBoxAdapter(child: SizedBox(height: 32)),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Future<bool> _confirmDiscard(BuildContext context) async {
+    final result = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Discard Changes?'),
+        content: const Text('You have unsaved changes. Do you want to discard them?'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context, false),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.pop(context, true),
+            child: const Text('Discard'),
+          ),
+        ],
+      ),
+    );
+    return result ?? false;
+  }
+
+  Future<void> _saveChanges() async {
+    await ref.read(extensionProvider.notifier).setMetadataProviderPriority(_providers);
+    setState(() {
+      _hasChanges = false;
+    });
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('Metadata provider priority saved')),
+      );
+    }
+  }
+}
+
+class _MetadataProviderItem extends StatelessWidget {
+  final String provider;
+  final int index;
+  final bool isFirst;
+  final bool isLast;
+
+  const _MetadataProviderItem({
+    super.key,
+    required this.provider,
+    required this.index,
+    required this.isFirst,
+    required this.isLast,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+
+    final backgroundColor = isDark
+        ? Color.alphaBlend(
+            Colors.white.withValues(alpha: 0.05),
+            colorScheme.surface,
+          )
+        : colorScheme.surfaceContainerHigh;
+
+    final info = _getProviderInfo(provider);
+
+    return Padding(
+      padding: const EdgeInsets.only(bottom: 8),
+      child: Material(
+        color: backgroundColor,
+        borderRadius: BorderRadius.circular(16),
+        child: ReorderableDragStartListener(
+          index: index,
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+            child: Row(
+              children: [
+                // Priority number
+                Container(
+                  width: 28,
+                  height: 28,
+                  decoration: BoxDecoration(
+                    color: isFirst
+                        ? colorScheme.primaryContainer
+                        : colorScheme.surfaceContainerHighest,
+                    shape: BoxShape.circle,
+                  ),
+                  child: Center(
+                    child: Text(
+                      '${index + 1}',
+                      style: TextStyle(
+                        fontWeight: FontWeight.bold,
+                        color: isFirst
+                            ? colorScheme.onPrimaryContainer
+                            : colorScheme.onSurfaceVariant,
+                      ),
+                    ),
+                  ),
+                ),
+                const SizedBox(width: 16),
+                // Provider icon
+                Icon(
+                  info.icon,
+                  color: info.isBuiltIn
+                      ? colorScheme.primary
+                      : colorScheme.secondary,
+                ),
+                const SizedBox(width: 12),
+                // Provider name
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        info.name,
+                        style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                          fontWeight: FontWeight.w500,
+                        ),
+                      ),
+                      Text(
+                        info.description,
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+                // Drag handle
+                Icon(
+                  Icons.drag_handle,
+                  color: colorScheme.onSurfaceVariant,
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  _MetadataProviderInfo _getProviderInfo(String provider) {
+    switch (provider) {
+      case 'deezer':
+        return _MetadataProviderInfo(
+          name: 'Deezer',
+          icon: Icons.album,
+          description: 'No rate limits',
+          isBuiltIn: true,
+        );
+      case 'spotify':
+        return _MetadataProviderInfo(
+          name: 'Spotify',
+          icon: Icons.music_note,
+          description: 'May rate limit',
+          isBuiltIn: true,
+        );
+      default:
+        // Extension provider
+        return _MetadataProviderInfo(
+          name: provider,
+          icon: Icons.extension,
+          description: 'Extension',
+          isBuiltIn: false,
+        );
+    }
+  }
+}
+
+class _MetadataProviderInfo {
+  final String name;
+  final IconData icon;
+  final String description;
+  final bool isBuiltIn;
+
+  _MetadataProviderInfo({
+    required this.name,
+    required this.icon,
+    required this.description,
+    required this.isBuiltIn,
+  });
+}
@@ -0,0 +1,369 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+
+class ProviderPriorityPage extends ConsumerStatefulWidget {
+  const ProviderPriorityPage({super.key});
+
+  @override
+  ConsumerState<ProviderPriorityPage> createState() => _ProviderPriorityPageState();
+}
+
+class _ProviderPriorityPageState extends ConsumerState<ProviderPriorityPage> {
+  late List<String> _providers;
+  bool _hasChanges = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _loadProviders();
+  }
+
+  void _loadProviders() {
+    final extState = ref.read(extensionProvider);
+    final allProviders = ref.read(extensionProvider.notifier).getAllDownloadProviders();
+    
+    // Use saved priority if available, otherwise use default order
+    if (extState.providerPriority.isNotEmpty) {
+      // Start with saved priority
+      _providers = List.from(extState.providerPriority);
+      // Add any new providers not in saved priority
+      for (final provider in allProviders) {
+        if (!_providers.contains(provider)) {
+          _providers.add(provider);
+        }
+      }
+      // Remove providers that no longer exist
+      _providers.removeWhere((p) => !allProviders.contains(p));
+    } else {
+      _providers = allProviders;
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final topPadding = MediaQuery.of(context).padding.top;
+
+    return PopScope(
+      canPop: !_hasChanges,
+      onPopInvokedWithResult: (didPop, result) async {
+        if (didPop) return;
+        final shouldPop = await _confirmDiscard(context);
+        if (shouldPop && context.mounted) {
+          Navigator.pop(context);
+        }
+      },
+      child: Scaffold(
+        body: CustomScrollView(
+          slivers: [
+            // App Bar
+            SliverAppBar(
+              expandedHeight: 120 + topPadding,
+              collapsedHeight: kToolbarHeight,
+              floating: false,
+              pinned: true,
+              backgroundColor: colorScheme.surface,
+              surfaceTintColor: Colors.transparent,
+              leading: IconButton(
+                icon: const Icon(Icons.arrow_back),
+                onPressed: () async {
+                  if (_hasChanges) {
+                    final shouldPop = await _confirmDiscard(context);
+                    if (shouldPop && context.mounted) {
+                      Navigator.pop(context);
+                    }
+                  } else {
+                    Navigator.pop(context);
+                  }
+                },
+              ),
+              actions: [
+                if (_hasChanges)
+                  TextButton(
+                    onPressed: _saveChanges,
+                    child: const Text('Save'),
+                  ),
+              ],
+              flexibleSpace: LayoutBuilder(
+                builder: (context, constraints) {
+                  final maxHeight = 120 + topPadding;
+                  final minHeight = kToolbarHeight + topPadding;
+                  final expandRatio = ((constraints.maxHeight - minHeight) /
+                          (maxHeight - minHeight))
+                      .clamp(0.0, 1.0);
+                  final leftPadding = 56 - (32 * expandRatio);
+                  return FlexibleSpaceBar(
+                    expandedTitleScale: 1.0,
+                    titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+                    title: Text(
+                      'Provider Priority',
+                      style: TextStyle(
+                        fontSize: 20 + (8 * expandRatio),
+                        fontWeight: FontWeight.bold,
+                        color: colorScheme.onSurface,
+                      ),
+                    ),
+                  );
+                },
+              ),
+            ),
+
+            // Description
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Text(
+                  'Drag to reorder download providers. The app will try providers '
+                  'from top to bottom when downloading tracks.',
+                  style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                    color: colorScheme.onSurfaceVariant,
+                  ),
+                ),
+              ),
+            ),
+
+            // Provider list
+            SliverPadding(
+              padding: const EdgeInsets.symmetric(horizontal: 16),
+              sliver: SliverReorderableList(
+                itemCount: _providers.length,
+                itemBuilder: (context, index) {
+                  final provider = _providers[index];
+                  return _ProviderItem(
+                    key: ValueKey(provider),
+                    provider: provider,
+                    index: index,
+                    isFirst: index == 0,
+                    isLast: index == _providers.length - 1,
+                  );
+                },
+                onReorder: (oldIndex, newIndex) {
+                  setState(() {
+                    if (newIndex > oldIndex) {
+                      newIndex -= 1;
+                    }
+                    final item = _providers.removeAt(oldIndex);
+                    _providers.insert(newIndex, item);
+                    _hasChanges = true;
+                  });
+                },
+              ),
+            ),
+
+            // Info section
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Container(
+                  padding: const EdgeInsets.all(12),
+                  decoration: BoxDecoration(
+                    color: colorScheme.tertiaryContainer.withValues(alpha: 0.3),
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                  child: Row(
+                    children: [
+                      Icon(Icons.info_outline, size: 20, color: colorScheme.tertiary),
+                      const SizedBox(width: 12),
+                      Expanded(
+                        child: Text(
+                          'If a track is not available on the first provider, '
+                          'the app will automatically try the next one.',
+                          style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                            color: colorScheme.onTertiaryContainer,
+                          ),
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+            ),
+
+            const SliverToBoxAdapter(child: SizedBox(height: 32)),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Future<bool> _confirmDiscard(BuildContext context) async {
+    final result = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Discard Changes?'),
+        content: const Text('You have unsaved changes. Do you want to discard them?'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context, false),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.pop(context, true),
+            child: const Text('Discard'),
+          ),
+        ],
+      ),
+    );
+    return result ?? false;
+  }
+
+  Future<void> _saveChanges() async {
+    await ref.read(extensionProvider.notifier).setProviderPriority(_providers);
+    setState(() {
+      _hasChanges = false;
+    });
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('Provider priority saved')),
+      );
+    }
+  }
+}
+
+class _ProviderItem extends StatelessWidget {
+  final String provider;
+  final int index;
+  final bool isFirst;
+  final bool isLast;
+
+  const _ProviderItem({
+    super.key,
+    required this.provider,
+    required this.index,
+    required this.isFirst,
+    required this.isLast,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+
+    final backgroundColor = isDark
+        ? Color.alphaBlend(
+            Colors.white.withValues(alpha: 0.05),
+            colorScheme.surface,
+          )
+        : colorScheme.surfaceContainerHigh;
+
+    // Get provider info
+    final info = _getProviderInfo(provider);
+
+    return Padding(
+      padding: const EdgeInsets.only(bottom: 8),
+      child: Material(
+        color: backgroundColor,
+        borderRadius: BorderRadius.circular(16),
+        child: ReorderableDragStartListener(
+          index: index,
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+            child: Row(
+              children: [
+                // Priority number
+                Container(
+                  width: 28,
+                  height: 28,
+                  decoration: BoxDecoration(
+                    color: isFirst
+                        ? colorScheme.primaryContainer
+                        : colorScheme.surfaceContainerHighest,
+                    shape: BoxShape.circle,
+                  ),
+                  child: Center(
+                    child: Text(
+                      '${index + 1}',
+                      style: TextStyle(
+                        fontWeight: FontWeight.bold,
+                        color: isFirst
+                            ? colorScheme.onPrimaryContainer
+                            : colorScheme.onSurfaceVariant,
+                      ),
+                    ),
+                  ),
+                ),
+                const SizedBox(width: 16),
+                // Provider icon
+                Icon(
+                  info.icon,
+                  color: info.isBuiltIn
+                      ? colorScheme.primary
+                      : colorScheme.secondary,
+                ),
+                const SizedBox(width: 12),
+                // Provider name
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        info.name,
+                        style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                          fontWeight: FontWeight.w500,
+                        ),
+                      ),
+                      Text(
+                        info.isBuiltIn ? 'Built-in' : 'Extension',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+                // Drag handle
+                Icon(
+                  Icons.drag_handle,
+                  color: colorScheme.onSurfaceVariant,
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  _ProviderInfo _getProviderInfo(String provider) {
+    switch (provider) {
+      case 'tidal':
+        return _ProviderInfo(
+          name: 'Tidal',
+          icon: Icons.music_note,
+          isBuiltIn: true,
+        );
+      case 'qobuz':
+        return _ProviderInfo(
+          name: 'Qobuz',
+          icon: Icons.album,
+          isBuiltIn: true,
+        );
+      case 'amazon':
+        return _ProviderInfo(
+          name: 'Amazon Music',
+          icon: Icons.shopping_bag,
+          isBuiltIn: true,
+        );
+      default:
+        // Extension provider
+        return _ProviderInfo(
+          name: provider,
+          icon: Icons.extension,
+          isBuiltIn: false,
+        );
+    }
+  }
+}
+
+class _ProviderInfo {
+  final String name;
+  final IconData icon;
+  final bool isBuiltIn;
+
+  _ProviderInfo({
+    required this.name,
+    required this.icon,
+    required this.isBuiltIn,
+  });
+}
@@ -3,8 +3,10 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:spotiflac_android/constants/app_info.dart';
 import 'package:spotiflac_android/screens/settings/appearance_settings_page.dart';
 import 'package:spotiflac_android/screens/settings/download_settings_page.dart';
+import 'package:spotiflac_android/screens/settings/extensions_page.dart';
 import 'package:spotiflac_android/screens/settings/options_settings_page.dart';
 import 'package:spotiflac_android/screens/settings/about_page.dart';
+import 'package:spotiflac_android/screens/settings/log_screen.dart';
 import 'package:spotiflac_android/widgets/settings_group.dart';

 class SettingsTab extends ConsumerWidget {
@@ -13,29 +15,41 @@ class SettingsTab extends ConsumerWidget {
  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final colorScheme = Theme.of(context).colorScheme;
+    final topPadding = MediaQuery.of(context).padding.top;

    return CustomScrollView(
      slivers: [
        // Collapsing App Bar
        SliverAppBar(
-          expandedHeight: 130,
+          expandedHeight: 120 + topPadding,
          collapsedHeight: kToolbarHeight,
          floating: false,
          pinned: true,
          backgroundColor: colorScheme.surface,
          surfaceTintColor: Colors.transparent,
          automaticallyImplyLeading: false,
-          flexibleSpace: FlexibleSpaceBar(
-            expandedTitleScale: 1.3,
-            titlePadding: const EdgeInsets.only(left: 24, bottom: 16),
-            title: Text(
-              'Settings',
-              style: TextStyle(
-                fontSize: 28,
-                fontWeight: FontWeight.bold,
-                color: colorScheme.onSurface,
-              ),
-            ),
+          flexibleSpace: LayoutBuilder(
+            builder: (context, constraints) {
+              final maxHeight = 120 + topPadding;
+              final minHeight = kToolbarHeight + topPadding;
+              final expandRatio =
+                  ((constraints.maxHeight - minHeight) /
+                          (maxHeight - minHeight))
+                      .clamp(0.0, 1.0);
+
+              return FlexibleSpaceBar(
+                expandedTitleScale: 1.0,
+                titlePadding: const EdgeInsets.only(left: 24, bottom: 16),
+                title: Text(
+                  'Settings',
+                  style: TextStyle(
+                    fontSize: 20 + (14 * expandRatio), // 20 -> 34
+                    fontWeight: FontWeight.bold,
+                    color: colorScheme.onSurface,
+                  ),
+                ),
+              );
+            },
          ),
        ),

@@ -48,7 +62,8 @@ class SettingsTab extends ConsumerWidget {
                icon: Icons.palette_outlined,
                title: 'Appearance',
                subtitle: 'Theme, colors, display',
-                onTap: () => _navigateTo(context, const AppearanceSettingsPage()),
+                onTap: () =>
+                    _navigateTo(context, const AppearanceSettingsPage()),
              ),
              SettingsItem(
                icon: Icons.download_outlined,
@@ -61,16 +76,28 @@ class SettingsTab extends ConsumerWidget {
                title: 'Options',
                subtitle: 'Fallback, lyrics, cover art, updates',
                onTap: () => _navigateTo(context, const OptionsSettingsPage()),
+              ),
+              SettingsItem(
+                icon: Icons.extension_outlined,
+                title: 'Extensions',
+                subtitle: 'Manage download providers',
+                onTap: () => _navigateTo(context, const ExtensionsPage()),
                showDivider: false,
              ),
            ],
          ),
        ),

-        // Second group: About
+        // Second group: Logs & About
        SliverToBoxAdapter(
          child: SettingsGroup(
            children: [
+              SettingsItem(
+                icon: Icons.article_outlined,
+                title: 'Logs',
+                subtitle: 'View app logs for debugging',
+                onTap: () => _navigateTo(context, const LogScreen()),
+              ),
              SettingsItem(
                icon: Icons.info_outline,
                title: 'About',
@@ -81,7 +108,7 @@ class SettingsTab extends ConsumerWidget {
            ],
          ),
        ),
-        
+
        // Fill remaining space
        const SliverFillRemaining(hasScrollBody: false, child: SizedBox()),
      ],
@@ -89,6 +116,27 @@ class SettingsTab extends ConsumerWidget {
  }

  void _navigateTo(BuildContext context, Widget page) {
-    Navigator.of(context).push(MaterialPageRoute(builder: (_) => page));
+    Navigator.of(context).push(
+      // Use PageRouteBuilder for better predictive back gesture support
+      // MaterialPageRoute can cause freeze on some devices with gesture navigation
+      PageRouteBuilder(
+        pageBuilder: (context, animation, secondaryAnimation) => page,
+        transitionsBuilder: (context, animation, secondaryAnimation, child) {
+          // Use slide transition similar to MaterialPageRoute
+          const begin = Offset(1.0, 0.0);
+          const end = Offset.zero;
+          const curve = Curves.easeInOut;
+          var tween = Tween(begin: begin, end: end).chain(
+            CurveTween(curve: curve),
+          );
+          return SlideTransition(
+            position: animation.drive(tween),
+            child: child,
+          );
+        },
+        transitionDuration: const Duration(milliseconds: 300),
+        reverseTransitionDuration: const Duration(milliseconds: 250),
+      ),
+    );
  }
 }
@@ -66,24 +66,38 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
      }
    } else if (Platform.isAndroid) {
      // Check storage permission
-      PermissionStatus storageStatus;
+      bool storageGranted = false;
+      
      if (_androidSdkVersion >= 33) {
-        storageStatus = await Permission.audio.status;
+        // Android 13+: Need BOTH MANAGE_EXTERNAL_STORAGE AND READ_MEDIA_AUDIO
+        final manageStatus = await Permission.manageExternalStorage.status;
+        final audioStatus = await Permission.audio.status;
+        debugPrint('[Permission] Android 13+ check: MANAGE_EXTERNAL_STORAGE=$manageStatus, READ_MEDIA_AUDIO=$audioStatus');
+        storageGranted = manageStatus.isGranted && audioStatus.isGranted;
      } else if (_androidSdkVersion >= 30) {
-        storageStatus = await Permission.manageExternalStorage.status;
+        // Android 11-12: Need MANAGE_EXTERNAL_STORAGE only
+        final manageStatus = await Permission.manageExternalStorage.status;
+        debugPrint('[Permission] Android 11-12 check: MANAGE_EXTERNAL_STORAGE=$manageStatus');
+        storageGranted = manageStatus.isGranted;
      } else {
-        storageStatus = await Permission.storage.status;
+        // Android 10 and below: Use legacy storage permission
+        final storageStatus = await Permission.storage.status;
+        debugPrint('[Permission] Android 10- check: STORAGE=$storageStatus');
+        storageGranted = storageStatus.isGranted;
      }
      
+      debugPrint('[Permission] Final storageGranted=$storageGranted');
+      
      // Check notification permission (Android 13+)
      PermissionStatus notificationStatus = PermissionStatus.granted;
      if (_androidSdkVersion >= 33) {
        notificationStatus = await Permission.notification.status;
+        debugPrint('[Permission] Notification=$notificationStatus');
      }
      
      if (mounted) {
        setState(() {
-          _storagePermissionGranted = storageStatus.isGranted;
+          _storagePermissionGranted = storageGranted;
          _notificationPermissionGranted = notificationStatus.isGranted;
        });
      }
@@ -97,17 +111,57 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
      if (Platform.isIOS) {
        setState(() => _storagePermissionGranted = true);
      } else if (Platform.isAndroid) {
-        PermissionStatus status;
+        bool allGranted = false;
        
        if (_androidSdkVersion >= 33) {
-          // Android 13+: Use audio permission
-          status = await Permission.audio.request();
+          // Android 13+: Need BOTH MANAGE_EXTERNAL_STORAGE AND READ_MEDIA_AUDIO
+          
+          // First check/request MANAGE_EXTERNAL_STORAGE
+          var manageStatus = await Permission.manageExternalStorage.status;
+          if (!manageStatus.isGranted) {
+            if (mounted) {
+              final shouldOpen = await showDialog<bool>(
+                context: context,
+                builder: (context) => AlertDialog(
+                  title: const Text('Storage Access Required'),
+                  content: const Text(
+                    'SpotiFLAC needs "All files access" permission to save music files to your chosen folder.\n\n'
+                    'Please enable "Allow access to manage all files" in the next screen.',
+                  ),
+                  actions: [
+                    TextButton(
+                      onPressed: () => Navigator.pop(context, false),
+                      child: const Text('Cancel'),
+                    ),
+                    FilledButton(
+                      onPressed: () => Navigator.pop(context, true),
+                      child: const Text('Open Settings'),
+                    ),
+                  ],
+                ),
+              );
+              
+              if (shouldOpen == true) {
+                await Permission.manageExternalStorage.request();
+                // Re-check after returning from settings
+                await Future.delayed(const Duration(milliseconds: 500));
+                manageStatus = await Permission.manageExternalStorage.status;
+              }
+            }
+          }
+          
+          // Then request READ_MEDIA_AUDIO (this shows a dialog)
+          var audioStatus = await Permission.audio.status;
+          if (!audioStatus.isGranted && manageStatus.isGranted) {
+            audioStatus = await Permission.audio.request();
+          }
+          
+          allGranted = manageStatus.isGranted && audioStatus.isGranted;
+          
        } else if (_androidSdkVersion >= 30) {
-          // Android 11-12: Need MANAGE_EXTERNAL_STORAGE
-          // This opens system settings, not a dialog
-          status = await Permission.manageExternalStorage.status;
-          if (!status.isGranted) {
-            // Show explanation dialog first
+          // Android 11-12: Need MANAGE_EXTERNAL_STORAGE only
+          var manageStatus = await Permission.manageExternalStorage.status;
+          if (!manageStatus.isGranted) {
            if (mounted) {
              final shouldOpen = await showDialog<bool>(
                context: context,
@@ -131,23 +185,33 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
              );
              
              if (shouldOpen == true) {
-                status = await Permission.manageExternalStorage.request();
+                await Permission.manageExternalStorage.request();
+                // Re-check after returning from settings
+                await Future.delayed(const Duration(milliseconds: 500));
+                manageStatus = await Permission.manageExternalStorage.status;
              }
            }
          }
+          allGranted = manageStatus.isGranted;
+          
        } else {
          // Android 10 and below: Use legacy storage permission
-          status = await Permission.storage.request();
+          final status = await Permission.storage.request();
+          allGranted = status.isGranted;
+          
+          if (status.isPermanentlyDenied) {
+            _showPermissionDeniedDialog('Storage');
+            setState(() => _isLoading = false);
+            return;
+          }
        }
        
-        if (status.isGranted) {
+        if (allGranted) {
          setState(() => _storagePermissionGranted = true);
-        } else if (status.isPermanentlyDenied) {
-          _showPermissionDeniedDialog('Storage');
        } else {
          if (mounted) {
            ScaffoldMessenger.of(context).showSnackBar(
-              const SnackBar(content: Text('Permission denied. Please grant permission to continue.')),
+              const SnackBar(content: Text('Permission denied. Please grant all permissions to continue.')),
            );
          }
        }
@@ -380,11 +444,10 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
          _clientIdController.text.trim(),
          _clientSecretController.text.trim(),
        );
-        ref.read(settingsProvider.notifier).setUseCustomSpotifyCredentials(true);
-        // Set search source to Spotify when using custom credentials
+        // Set search source to Spotify when credentials are provided
        ref.read(settingsProvider.notifier).setMetadataSource('spotify');
      } else {
-        // Use Deezer as default search source
+        // Use Deezer as default search source (free, no credentials required)
        ref.read(settingsProvider.notifier).setMetadataSource('deezer');
      }
      
@@ -0,0 +1,751 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:spotiflac_android/providers/store_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+
+class ExtensionDetailsScreen extends ConsumerStatefulWidget {
+  final StoreExtension extension;
+
+  const ExtensionDetailsScreen({super.key, required this.extension});
+
+  @override
+  ConsumerState<ExtensionDetailsScreen> createState() =>
+      _ExtensionDetailsScreenState();
+}
+
+class _ExtensionDetailsScreenState
+    extends ConsumerState<ExtensionDetailsScreen> {
+
+  @override
+  Widget build(BuildContext context) {
+    // Watch store provider to get latest state of this extension (e.g. if updated/installed)
+    final storeState = ref.watch(storeProvider);
+
+    // Find our extension in the store state to get the latest status
+    // If not found in current store state (rare), fallback to widget.extension
+    final liveExtension =
+        storeState.extensions
+            .where((e) => e.id == widget.extension.id)
+            .firstOrNull ??
+        widget.extension;
+
+    final isDownloading = storeState.downloadingId == liveExtension.id;
+    final colorScheme = Theme.of(context).colorScheme;
+
+    return Scaffold(
+      body: CustomScrollView(
+        slivers: [
+          _buildAppBar(context, liveExtension, colorScheme),
+          _buildInfoCard(context, liveExtension, colorScheme, isDownloading),
+          _buildSectionHeader(
+            context,
+            'About',
+            Icons.info_outline,
+            colorScheme,
+          ),
+          _buildDescription(context, liveExtension, colorScheme),
+
+          if (liveExtension.tags.isNotEmpty) ...[
+            _buildSectionHeader(context, 'Tags', Icons.tag, colorScheme),
+            _buildTags(context, liveExtension, colorScheme),
+          ],
+
+          _buildSectionHeader(
+            context,
+            'Information',
+            Icons.table_chart_outlined,
+            colorScheme,
+          ),
+          _buildMetadataTable(context, liveExtension, colorScheme),
+
+          _buildSectionHeader(
+            context,
+            'Capabilities',
+            Icons.extension_outlined,
+            colorScheme,
+          ),
+          _buildCapabilities(context, liveExtension, colorScheme),
+
+          const SliverToBoxAdapter(child: SizedBox(height: 32)),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildAppBar(
+    BuildContext context,
+    StoreExtension ext,
+    ColorScheme colorScheme,
+  ) {
+    return SliverAppBar(
+      expandedHeight: 200,
+      pinned: true,
+      stretch: true,
+      backgroundColor: colorScheme.surface,
+      surfaceTintColor: Colors.transparent,
+      flexibleSpace: FlexibleSpaceBar(
+        background: Center(
+          child: Padding(
+            padding: const EdgeInsets.only(top: kToolbarHeight),
+            child: Container(
+              width: 100,
+              height: 100,
+              decoration: BoxDecoration(
+                borderRadius: BorderRadius.circular(24),
+                color: colorScheme.surfaceContainerHighest,
+                boxShadow: [
+                  BoxShadow(
+                    color: Colors.black.withValues(alpha: 0.1),
+                    blurRadius: 16,
+                    offset: const Offset(0, 4),
+                  ),
+                ],
+              ),
+              child: ClipRRect(
+                borderRadius: BorderRadius.circular(24),
+                child: ext.iconUrl != null && ext.iconUrl!.isNotEmpty
+                    ? Image.network(
+                        ext.iconUrl!,
+                        fit: BoxFit.cover,
+                        errorBuilder: (context, error, stackTrace) =>
+                            _buildFallbackIcon(ext, colorScheme, 50),
+                      )
+                    : _buildFallbackIcon(ext, colorScheme, 50),
+              ),
+            ),
+          ),
+        ),
+      ),
+      leading: IconButton(
+        icon: const Icon(Icons.arrow_back),
+        onPressed: () => Navigator.pop(context),
+      ),
+    );
+  }
+
+  Widget _buildFallbackIcon(
+    StoreExtension ext,
+    ColorScheme colorScheme,
+    double size,
+  ) {
+    return Container(
+      color: colorScheme.surfaceContainerHighest,
+      child: Icon(
+        _getCategoryIcon(ext.category),
+        size: size,
+        color: colorScheme.onSurfaceVariant,
+      ),
+    );
+  }
+
+  Widget _buildInfoCard(
+    BuildContext context,
+    StoreExtension ext,
+    ColorScheme colorScheme,
+    bool isDownloading,
+  ) {
+    return SliverToBoxAdapter(
+      child: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Card(
+          elevation: 0,
+          color: colorScheme.surfaceContainerLow,
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(20),
+          ),
+          child: Padding(
+            padding: const EdgeInsets.all(20),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Row(
+                  children: [
+                    Expanded(
+                      child: Column(
+                        crossAxisAlignment: CrossAxisAlignment.start,
+                        children: [
+                          Text(
+                            ext.displayName,
+                            style: Theme.of(context).textTheme.headlineSmall
+                                ?.copyWith(
+                                  fontWeight: FontWeight.bold,
+                                  color: colorScheme.onSurface,
+                                ),
+                          ),
+                          const SizedBox(height: 4),
+                          Text(
+                            'by ${ext.author}',
+                            style: Theme.of(context).textTheme.bodyLarge
+                                ?.copyWith(color: colorScheme.onSurfaceVariant),
+                          ),
+                        ],
+                      ),
+                    ),
+                  ],
+                ),
+
+                const SizedBox(height: 16),
+
+                // Badges row
+                Wrap(
+                  spacing: 8,
+                  runSpacing: 8,
+                  children: [
+                    _Badge(
+                      label: 'v${ext.version}',
+                      color: colorScheme.secondaryContainer,
+                      textColor: colorScheme.onSecondaryContainer,
+                    ),
+                    _Badge(
+                      label: _getCategoryName(ext.category),
+                      color: colorScheme.tertiaryContainer,
+                      textColor: colorScheme.onTertiaryContainer,
+                    ),
+                    if (ext.isInstalled)
+                      _Badge(
+                        label: 'Installed',
+                        color: colorScheme.primaryContainer,
+                        textColor: colorScheme.onPrimaryContainer,
+                        icon: Icons.check,
+                      ),
+                  ],
+                ),
+
+                const SizedBox(height: 24),
+
+                // Action Buttons
+                if (isDownloading)
+                  Center(
+                    child: CircularProgressIndicator(
+                      color: colorScheme.primary,
+                    ),
+                  )
+                else ...[
+                  if (ext.hasUpdate)
+                    FilledButton.icon(
+                      onPressed: () => _updateExtension(ext),
+                      icon: const Icon(Icons.update),
+                      label: Text('Update to v${ext.version}'),
+                      style: FilledButton.styleFrom(
+                        minimumSize: const Size.fromHeight(52),
+                        shape: RoundedRectangleBorder(
+                          borderRadius: BorderRadius.circular(16),
+                        ),
+                      ),
+                    )
+                  else if (ext.isInstalled)
+                    Row(
+                      children: [
+                        Expanded(
+                          child: OutlinedButton.icon(
+                            onPressed: null,
+                            icon: const Icon(Icons.check),
+                            label: const Text('Installed'),
+                            style: OutlinedButton.styleFrom(
+                              minimumSize: const Size(0, 52),
+                              shape: RoundedRectangleBorder(
+                                borderRadius: BorderRadius.circular(16),
+                              ),
+                            ),
+                          ),
+                        ),
+                        const SizedBox(width: 12),
+                        IconButton.filled(
+                          onPressed: () => _uninstallExtension(ext),
+                          icon: const Icon(Icons.delete_outline),
+                          style: IconButton.styleFrom(
+                            backgroundColor: colorScheme.errorContainer,
+                            foregroundColor: colorScheme.onErrorContainer,
+                            minimumSize: const Size(52, 52),
+                            shape: RoundedRectangleBorder(
+                              borderRadius: BorderRadius.circular(16),
+                            ),
+                          ),
+                          tooltip: 'Uninstall',
+                        ),
+                      ],
+                    )
+                  else
+                    FilledButton.icon(
+                      onPressed: () => _installExtension(ext),
+                      icon: const Icon(Icons.download),
+                      label: const Text('Install Extension'),
+                      style: FilledButton.styleFrom(
+                        minimumSize: const Size.fromHeight(52),
+                        shape: RoundedRectangleBorder(
+                          borderRadius: BorderRadius.circular(16),
+                        ),
+                      ),
+                    ),
+                ],
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildSectionHeader(
+    BuildContext context,
+    String title,
+    IconData icon,
+    ColorScheme colorScheme,
+  ) {
+    return SliverToBoxAdapter(
+      child: Padding(
+        padding: const EdgeInsets.fromLTRB(20, 8, 20, 8),
+        child: Row(
+          children: [
+            Icon(icon, size: 20, color: colorScheme.primary),
+            const SizedBox(width: 8),
+            Text(
+              title,
+              style: Theme.of(context).textTheme.titleMedium?.copyWith(
+                fontWeight: FontWeight.w600,
+                color: colorScheme.onSurface,
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildDescription(
+    BuildContext context,
+    StoreExtension ext,
+    ColorScheme colorScheme,
+  ) {
+    return SliverToBoxAdapter(
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 8),
+        child: Text(
+          ext.description,
+          style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+            height: 1.5,
+            color: colorScheme.onSurface,
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildTags(
+    BuildContext context,
+    StoreExtension ext,
+    ColorScheme colorScheme,
+  ) {
+    return SliverToBoxAdapter(
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 8),
+        child: Wrap(
+          spacing: 8,
+          runSpacing: 8,
+          children: ext.tags
+              .map(
+                (tag) => Chip(
+                  label: Text(tag),
+                  backgroundColor: colorScheme.surfaceContainer,
+                  labelStyle: Theme.of(context).textTheme.bodySmall?.copyWith(
+                    color: colorScheme.onSurfaceVariant,
+                  ),
+                  side: BorderSide.none,
+                  shape: RoundedRectangleBorder(
+                    borderRadius: BorderRadius.circular(20),
+                  ),
+                ),
+              )
+              .toList(),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildMetadataTable(
+    BuildContext context,
+    StoreExtension ext,
+    ColorScheme colorScheme,
+  ) {
+    return SliverPadding(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+      sliver: SliverToBoxAdapter(
+        child: Card(
+          elevation: 0,
+          color: colorScheme.surfaceContainer,
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(16),
+          ),
+          child: Column(
+            children: [
+              _MetadataRow(
+                label: 'Updated',
+                value: ext.updatedAt.isNotEmpty
+                    ? _formatDate(ext.updatedAt)
+                    : '-',
+                colorScheme: colorScheme,
+              ),
+              _MetadataRow(
+                label: 'ID',
+                value: ext.id,
+                colorScheme: colorScheme,
+              ),
+              _MetadataRow(
+                label: 'Min App Version',
+                value: ext.minAppVersion ?? 'Any',
+                colorScheme: colorScheme,
+                isLast: true,
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildCapabilities(
+    BuildContext context,
+    StoreExtension ext,
+    ColorScheme colorScheme,
+  ) {
+    // Determine capabilities based on category
+    final isMetadataProvider = ext.category == 'metadata' || ext.category == 'integration';
+    final isDownloadProvider = ext.category == 'download';
+    final isLyricsProvider = ext.category == 'lyrics';
+    final isUtility = ext.category == 'utility';
+
+    return SliverPadding(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+      sliver: SliverToBoxAdapter(
+        child: Card(
+          elevation: 0,
+          color: colorScheme.surfaceContainer,
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(16),
+          ),
+          child: Column(
+            children: [
+              _CapabilityRow(
+                icon: Icons.search,
+                label: 'Metadata Provider',
+                enabled: isMetadataProvider,
+                colorScheme: colorScheme,
+              ),
+              _CapabilityRow(
+                icon: Icons.download,
+                label: 'Download Provider',
+                enabled: isDownloadProvider,
+                colorScheme: colorScheme,
+              ),
+              _CapabilityRow(
+                icon: Icons.lyrics,
+                label: 'Lyrics Provider',
+                enabled: isLyricsProvider,
+                colorScheme: colorScheme,
+              ),
+              _CapabilityRow(
+                icon: Icons.build,
+                label: 'Utility Functions',
+                enabled: isUtility,
+                colorScheme: colorScheme,
+                isLast: true,
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  String _formatDate(String dateStr) {
+    try {
+      final date = DateTime.parse(dateStr);
+      final now = DateTime.now();
+      final diff = now.difference(date);
+      
+      if (diff.inDays == 0) {
+        return 'Today';
+      } else if (diff.inDays == 1) {
+        return 'Yesterday';
+      } else if (diff.inDays < 7) {
+        return '${diff.inDays} days ago';
+      } else if (diff.inDays < 30) {
+        return '${(diff.inDays / 7).floor()} weeks ago';
+      } else if (diff.inDays < 365) {
+        return '${(diff.inDays / 30).floor()} months ago';
+      } else {
+        return '${date.year}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
+      }
+    } catch (_) {
+      return dateStr.split('T').first;
+    }
+  }
+
+  IconData _getCategoryIcon(String category) {
+    switch (category) {
+      case 'metadata':
+        return Icons.label_outline;
+      case 'download':
+        return Icons.download_outlined;
+      case 'utility':
+        return Icons.build_outlined;
+      case 'lyrics':
+        return Icons.lyrics_outlined;
+      case 'integration':
+        return Icons.link;
+      default:
+        return Icons.extension;
+    }
+  }
+
+  String _getCategoryName(String category) {
+    switch (category) {
+      case 'metadata':
+        return 'Metadata';
+      case 'download':
+        return 'Download';
+      case 'utility':
+        return 'Utility';
+      case 'lyrics':
+        return 'Lyrics';
+      case 'integration':
+        return 'Integration';
+      default:
+        return category;
+    }
+  }
+
+  Future<void> _installExtension(StoreExtension ext) async {
+    final tempDir = await getTemporaryDirectory();
+    final appDir = await getApplicationDocumentsDirectory();
+    final extensionsDir = '${appDir.path}/extensions';
+
+    final success = await ref
+        .read(storeProvider.notifier)
+        .installExtension(ext.id, tempDir.path, extensionsDir);
+
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(
+            success
+                ? '${ext.displayName} installed.'
+                : 'Failed to install ${ext.displayName}',
+          ),
+          behavior: SnackBarBehavior.floating,
+        ),
+      );
+    }
+  }
+
+  Future<void> _updateExtension(StoreExtension ext) async {
+    final tempDir = await getTemporaryDirectory();
+
+    final success = await ref
+        .read(storeProvider.notifier)
+        .updateExtension(ext.id, tempDir.path);
+
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(
+            success
+                ? '${ext.displayName} updated.'
+                : 'Failed to update ${ext.displayName}',
+          ),
+          behavior: SnackBarBehavior.floating,
+        ),
+      );
+    }
+  }
+
+  Future<void> _uninstallExtension(StoreExtension ext) async {
+    final confirm = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Uninstall Extension?'),
+        content: Text('Are you sure you want to remove ${ext.displayName}?'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context, false),
+            child: const Text('Cancel'),
+          ),
+          TextButton(
+            onPressed: () => Navigator.pop(context, true),
+            child: Text(
+              'Uninstall',
+              style: TextStyle(color: Theme.of(context).colorScheme.error),
+            ),
+          ),
+        ],
+      ),
+    );
+
+    if (confirm == true) {
+      await ref.read(extensionProvider.notifier).removeExtension(ext.id);
+      await ref.read(storeProvider.notifier).refresh();
+      if (mounted) {
+        Navigator.pop(context);
+      }
+    }
+  }
+}
+
+class _Badge extends StatelessWidget {
+  final String label;
+  final Color color;
+  final Color textColor;
+  final IconData? icon;
+
+  const _Badge({
+    required this.label,
+    required this.color,
+    required this.textColor,
+    this.icon,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
+      decoration: BoxDecoration(
+        color: color,
+        borderRadius: BorderRadius.circular(8),
+      ),
+      child: Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          if (icon != null) ...[
+            Icon(icon, size: 14, color: textColor),
+            const SizedBox(width: 4),
+          ],
+          Text(
+            label,
+            style: TextStyle(
+              fontSize: 12,
+              fontWeight: FontWeight.w600,
+              color: textColor,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class _MetadataRow extends StatelessWidget {
+  final String label;
+  final String value;
+  final ColorScheme colorScheme;
+  final bool isLast;
+
+  const _MetadataRow({
+    required this.label,
+    required this.value,
+    required this.colorScheme,
+    this.isLast = false,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+          child: Row(
+            mainAxisAlignment: MainAxisAlignment.spaceBetween,
+            children: [
+              Text(
+                label,
+                style: TextStyle(
+                  color: colorScheme.onSurfaceVariant,
+                  fontSize: 14,
+                ),
+              ),
+              Expanded(
+                child: Text(
+                  value,
+                  textAlign: TextAlign.end,
+                  style: TextStyle(
+                    color: colorScheme.onSurface,
+                    fontWeight: FontWeight.w500,
+                    fontSize: 14,
+                  ),
+                  overflow: TextOverflow.ellipsis,
+                ),
+              ),
+            ],
+          ),
+        ),
+        if (!isLast)
+          Divider(
+            height: 1,
+            thickness: 1,
+            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+            indent: 16,
+            endIndent: 16,
+          ),
+      ],
+    );
+  }
+}
+
+class _CapabilityRow extends StatelessWidget {
+  final IconData icon;
+  final String label;
+  final bool enabled;
+  final ColorScheme colorScheme;
+  final bool isLast;
+
+  const _CapabilityRow({
+    required this.icon,
+    required this.label,
+    required this.enabled,
+    required this.colorScheme,
+    this.isLast = false,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+          child: Row(
+            children: [
+              Icon(
+                icon,
+                size: 20,
+                color: enabled ? colorScheme.primary : colorScheme.outline,
+              ),
+              const SizedBox(width: 12),
+              Expanded(
+                child: Text(
+                  label,
+                  style: TextStyle(
+                    color: colorScheme.onSurface,
+                    fontSize: 14,
+                  ),
+                ),
+              ),
+              Icon(
+                enabled ? Icons.check_circle : Icons.cancel_outlined,
+                size: 20,
+                color: enabled ? colorScheme.primary : colorScheme.outline,
+              ),
+            ],
+          ),
+        ),
+        if (!isLast)
+          Divider(
+            height: 1,
+            thickness: 1,
+            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+            indent: 16,
+            endIndent: 16,
+          ),
+      ],
+    );
+  }
+}
@@ -0,0 +1,622 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:spotiflac_android/providers/store_provider.dart';
+import 'package:spotiflac_android/widgets/settings_group.dart';
+import 'package:spotiflac_android/screens/store/extension_details_screen.dart';
+
+class StoreTab extends ConsumerStatefulWidget {
+  const StoreTab({super.key});
+
+  @override
+  ConsumerState<StoreTab> createState() => _StoreTabState();
+}
+
+class _StoreTabState extends ConsumerState<StoreTab> {
+  final _searchController = TextEditingController();
+  bool _isInitialized = false;
+
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addPostFrameCallback((_) => _initialize());
+  }
+
+  Future<void> _initialize() async {
+    if (_isInitialized) return;
+    _isInitialized = true;
+
+    final cacheDir = await getApplicationCacheDirectory();
+
+    // Check if widget is still mounted after async operation
+    if (!mounted) return;
+
+    await ref.read(storeProvider.notifier).initialize(cacheDir.path);
+  }
+
+  @override
+  void dispose() {
+    _searchController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final state = ref.watch(storeProvider);
+    final colorScheme = Theme.of(context).colorScheme;
+    final topPadding = MediaQuery.of(context).padding.top;
+
+    return Scaffold(
+      body: RefreshIndicator(
+        onRefresh: () =>
+            ref.read(storeProvider.notifier).refresh(forceRefresh: true),
+        child: CustomScrollView(
+          slivers: [
+            // App Bar - consistent with other tabs
+            SliverAppBar(
+              expandedHeight: 120 + topPadding,
+              collapsedHeight: kToolbarHeight,
+              floating: false,
+              pinned: true,
+              backgroundColor: colorScheme.surface,
+              surfaceTintColor: Colors.transparent,
+              automaticallyImplyLeading: false,
+              flexibleSpace: LayoutBuilder(
+                builder: (context, constraints) {
+                  final maxHeight = 120 + topPadding;
+                  final minHeight = kToolbarHeight + topPadding;
+                  final expandRatio =
+                      ((constraints.maxHeight - minHeight) /
+                              (maxHeight - minHeight))
+                          .clamp(0.0, 1.0);
+
+                  return FlexibleSpaceBar(
+                    expandedTitleScale: 1.0,
+                    titlePadding: const EdgeInsets.only(left: 24, bottom: 16),
+                    title: Text(
+                      'Store',
+                      style: TextStyle(
+                        fontSize: 20 + (14 * expandRatio),
+                        fontWeight: FontWeight.bold,
+                        color: colorScheme.onSurface,
+                      ),
+                    ),
+                  );
+                },
+              ),
+            ),
+
+            // Search Bar
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
+                child: TextField(
+                  controller: _searchController,
+                  decoration: InputDecoration(
+                    hintText: 'Search extensions...',
+                    prefixIcon: const Icon(Icons.search),
+                    suffixIcon: _searchController.text.isNotEmpty
+                        ? IconButton(
+                            icon: const Icon(Icons.clear),
+                            onPressed: () {
+                              _searchController.clear();
+                              ref
+                                  .read(storeProvider.notifier)
+                                  .setSearchQuery('');
+                            },
+                          )
+                        : null,
+                    border: OutlineInputBorder(
+                      borderRadius: BorderRadius.circular(28),
+                      borderSide: BorderSide.none,
+                    ),
+                    filled: true,
+                    fillColor: Theme.of(context).brightness == Brightness.dark
+                        ? Color.alphaBlend(
+                            Colors.white.withValues(alpha: 0.08),
+                            colorScheme.surface,
+                          )
+                        : colorScheme.surfaceContainerHighest,
+                    contentPadding: const EdgeInsets.symmetric(
+                      horizontal: 16,
+                      vertical: 12,
+                    ),
+                  ),
+                  onChanged: (value) {
+                    ref.read(storeProvider.notifier).setSearchQuery(value);
+                    setState(() {}); // Update suffix icon
+                  },
+                ),
+              ),
+            ),
+
+            // Category Chips
+            SliverToBoxAdapter(
+              child: SingleChildScrollView(
+                scrollDirection: Axis.horizontal,
+                padding: const EdgeInsets.symmetric(
+                  horizontal: 16,
+                  vertical: 8,
+                ),
+                child: Row(
+                  children: [
+                    _CategoryChip(
+                      label: 'All',
+                      icon: Icons.apps,
+                      isSelected: state.selectedCategory == null,
+                      onTap: () =>
+                          ref.read(storeProvider.notifier).setCategory(null),
+                    ),
+                    const SizedBox(width: 8),
+                    _CategoryChip(
+                      label: 'Metadata',
+                      icon: Icons.label_outline,
+                      isSelected:
+                          state.selectedCategory == StoreCategory.metadata,
+                      onTap: () => ref
+                          .read(storeProvider.notifier)
+                          .setCategory(StoreCategory.metadata),
+                    ),
+                    const SizedBox(width: 8),
+                    _CategoryChip(
+                      label: 'Download',
+                      icon: Icons.download_outlined,
+                      isSelected:
+                          state.selectedCategory == StoreCategory.download,
+                      onTap: () => ref
+                          .read(storeProvider.notifier)
+                          .setCategory(StoreCategory.download),
+                    ),
+                    const SizedBox(width: 8),
+                    _CategoryChip(
+                      label: 'Utility',
+                      icon: Icons.build_outlined,
+                      isSelected:
+                          state.selectedCategory == StoreCategory.utility,
+                      onTap: () => ref
+                          .read(storeProvider.notifier)
+                          .setCategory(StoreCategory.utility),
+                    ),
+                    const SizedBox(width: 8),
+                    _CategoryChip(
+                      label: 'Lyrics',
+                      icon: Icons.lyrics_outlined,
+                      isSelected:
+                          state.selectedCategory == StoreCategory.lyrics,
+                      onTap: () => ref
+                          .read(storeProvider.notifier)
+                          .setCategory(StoreCategory.lyrics),
+                    ),
+                    const SizedBox(width: 8),
+                    _CategoryChip(
+                      label: 'Integration',
+                      icon: Icons.link,
+                      isSelected:
+                          state.selectedCategory == StoreCategory.integration,
+                      onTap: () => ref
+                          .read(storeProvider.notifier)
+                          .setCategory(StoreCategory.integration),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+
+            // Content
+            if (state.isLoading && state.extensions.isEmpty)
+              const SliverFillRemaining(
+                child: Center(child: CircularProgressIndicator()),
+              )
+            else if (state.error != null && state.extensions.isEmpty)
+              SliverFillRemaining(
+                child: _buildErrorState(state.error!, colorScheme),
+              )
+            else if (state.filteredExtensions.isEmpty)
+              SliverFillRemaining(child: _buildEmptyState(state, colorScheme))
+            else ...[
+              // Extensions count
+              SliverToBoxAdapter(
+                child: Padding(
+                  padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
+                  child: Text(
+                    '${state.filteredExtensions.length} ${state.filteredExtensions.length == 1 ? 'extension' : 'extensions'}',
+                    style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                      color: colorScheme.onSurfaceVariant,
+                    ),
+                  ),
+                ),
+              ),
+
+              // Extensions list in grouped card (like queue_tab)
+              SliverToBoxAdapter(
+                child: Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 16),
+                  child: SettingsGroup(
+                    children: state.filteredExtensions.asMap().entries.map((
+                      entry,
+                    ) {
+                      final index = entry.key;
+                      final ext = entry.value;
+                      return _ExtensionItem(
+                        extension: ext,
+                        showDivider:
+                            index < state.filteredExtensions.length - 1,
+                        isDownloading: state.downloadingId == ext.id,
+                        onInstall: () => _installExtension(ext),
+                        onUpdate: () => _updateExtension(ext),
+                        onTap: () => _showExtensionDetails(ext),
+                      );
+                    }).toList(),
+                  ),
+                ),
+              ),
+
+              // Bottom padding
+              const SliverToBoxAdapter(child: SizedBox(height: 16)),
+            ],
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildErrorState(String error, ColorScheme colorScheme) {
+    return Center(
+      child: Padding(
+        padding: const EdgeInsets.all(32),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Icon(Icons.error_outline, size: 64, color: colorScheme.error),
+            const SizedBox(height: 16),
+            Text(
+              'Failed to load store',
+              style: Theme.of(context).textTheme.titleMedium,
+            ),
+            const SizedBox(height: 8),
+            Text(
+              error,
+              style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                color: colorScheme.onSurfaceVariant,
+              ),
+              textAlign: TextAlign.center,
+            ),
+            const SizedBox(height: 24),
+            FilledButton.icon(
+              onPressed: () =>
+                  ref.read(storeProvider.notifier).refresh(forceRefresh: true),
+              icon: const Icon(Icons.refresh),
+              label: const Text('Retry'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildEmptyState(StoreState state, ColorScheme colorScheme) {
+    final hasFilters =
+        state.searchQuery.isNotEmpty || state.selectedCategory != null;
+
+    return Center(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Icon(
+            hasFilters ? Icons.search_off : Icons.extension_off,
+            size: 64,
+            color: colorScheme.onSurfaceVariant,
+          ),
+          const SizedBox(height: 16),
+          Text(
+            hasFilters ? 'No extensions found' : 'No extensions available',
+            style: Theme.of(context).textTheme.titleMedium?.copyWith(
+              color: colorScheme.onSurfaceVariant,
+            ),
+          ),
+          if (hasFilters) ...[
+            const SizedBox(height: 8),
+            TextButton(
+              onPressed: () {
+                _searchController.clear();
+                ref.read(storeProvider.notifier).clearSearch();
+              },
+              child: const Text('Clear filters'),
+            ),
+          ],
+        ],
+      ),
+    );
+  }
+
+  void _showExtensionDetails(StoreExtension ext) {
+    Navigator.of(context).push(
+      MaterialPageRoute(
+        builder: (context) => ExtensionDetailsScreen(extension: ext),
+      ),
+    );
+  }
+
+  Future<void> _installExtension(StoreExtension ext) async {
+    final tempDir = await getTemporaryDirectory();
+    final appDir = await getApplicationDocumentsDirectory();
+    final extensionsDir = '${appDir.path}/extensions';
+
+    final success = await ref
+        .read(storeProvider.notifier)
+        .installExtension(ext.id, tempDir.path, extensionsDir);
+
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(
+            success
+                ? '${ext.displayName} installed. Enable it in Settings > Extensions'
+                : 'Failed to install ${ext.displayName}',
+          ),
+          behavior: SnackBarBehavior.floating,
+        ),
+      );
+    }
+  }
+
+  Future<void> _updateExtension(StoreExtension ext) async {
+    final tempDir = await getTemporaryDirectory();
+
+    final success = await ref
+        .read(storeProvider.notifier)
+        .updateExtension(ext.id, tempDir.path);
+
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(
+            success
+                ? '${ext.displayName} updated to v${ext.version}'
+                : 'Failed to update ${ext.displayName}',
+          ),
+          behavior: SnackBarBehavior.floating,
+        ),
+      );
+    }
+  }
+}
+
+class _CategoryChip extends StatelessWidget {
+  final String label;
+  final IconData icon;
+  final bool isSelected;
+  final VoidCallback onTap;
+
+  const _CategoryChip({
+    required this.label,
+    required this.icon,
+    required this.isSelected,
+    required this.onTap,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return FilterChip(
+      label: Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [Icon(icon, size: 16), const SizedBox(width: 6), Text(label)],
+      ),
+      selected: isSelected,
+      onSelected: (_) => onTap(),
+      showCheckmark: false,
+    );
+  }
+}
+
+class _ExtensionItem extends StatelessWidget {
+  final StoreExtension extension;
+  final bool showDivider;
+  final bool isDownloading;
+  final VoidCallback onInstall;
+  final VoidCallback onUpdate;
+  final VoidCallback? onTap;
+
+  const _ExtensionItem({
+    required this.extension,
+    required this.showDivider,
+    required this.isDownloading,
+    required this.onInstall,
+    required this.onUpdate,
+    this.onTap,
+  });
+
+  IconData _getCategoryIcon(String category) {
+    switch (category) {
+      case StoreCategory.metadata:
+        return Icons.label_outline;
+      case StoreCategory.download:
+        return Icons.download_outlined;
+      case StoreCategory.utility:
+        return Icons.build_outlined;
+      case StoreCategory.lyrics:
+        return Icons.lyrics_outlined;
+      case StoreCategory.integration:
+        return Icons.link;
+      default:
+        return Icons.extension;
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        InkWell(
+          onTap: onTap,
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+            child: Row(
+              children: [
+                // Extension icon - custom or category-based
+                Container(
+                  width: 44,
+                  height: 44,
+                  decoration: BoxDecoration(
+                    color: extension.isInstalled
+                        ? colorScheme.primaryContainer
+                        : colorScheme.surfaceContainerHighest,
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                  clipBehavior: Clip.antiAlias,
+                  child:
+                      extension.iconUrl != null && extension.iconUrl!.isNotEmpty
+                      ? Image.network(
+                          extension.iconUrl!,
+                          width: 44,
+                          height: 44,
+                          fit: BoxFit.cover,
+                          errorBuilder: (context, error, stackTrace) => Icon(
+                            _getCategoryIcon(extension.category),
+                            color: extension.isInstalled
+                                ? colorScheme.onPrimaryContainer
+                                : colorScheme.onSurfaceVariant,
+                          ),
+                          loadingBuilder: (context, child, loadingProgress) {
+                            if (loadingProgress == null) return child;
+                            return Center(
+                              child: SizedBox(
+                                width: 20,
+                                height: 20,
+                                child: CircularProgressIndicator(
+                                  strokeWidth: 2,
+                                  value:
+                                      loadingProgress.expectedTotalBytes != null
+                                      ? loadingProgress.cumulativeBytesLoaded /
+                                            loadingProgress.expectedTotalBytes!
+                                      : null,
+                                ),
+                              ),
+                            );
+                          },
+                        )
+                      : Icon(
+                          _getCategoryIcon(extension.category),
+                          color: extension.isInstalled
+                              ? colorScheme.onPrimaryContainer
+                              : colorScheme.onSurfaceVariant,
+                        ),
+                ),
+                const SizedBox(width: 16),
+                // Extension info
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Row(
+                        children: [
+                          Expanded(
+                            child: Text(
+                              extension.displayName,
+                              style: Theme.of(context).textTheme.bodyLarge
+                                  ?.copyWith(fontWeight: FontWeight.w500),
+                            ),
+                          ),
+                          // Version badge
+                          Container(
+                            padding: const EdgeInsets.symmetric(
+                              horizontal: 6,
+                              vertical: 2,
+                            ),
+                            decoration: BoxDecoration(
+                              color: colorScheme.surfaceContainerHighest,
+                              borderRadius: BorderRadius.circular(6),
+                            ),
+                            child: Text(
+                              'v${extension.version}',
+                              style: Theme.of(context).textTheme.labelSmall
+                                  ?.copyWith(
+                                    color: colorScheme.onSurfaceVariant,
+                                  ),
+                            ),
+                          ),
+                        ],
+                      ),
+                      const SizedBox(height: 2),
+                      Text(
+                        'by ${extension.author}',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                      const SizedBox(height: 4),
+                      Text(
+                        extension.description,
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                        maxLines: 2,
+                        overflow: TextOverflow.ellipsis,
+                      ),
+                    ],
+                  ),
+                ),
+                const SizedBox(width: 12),
+                // Action button
+                if (isDownloading)
+                  const SizedBox(
+                    width: 24,
+                    height: 24,
+                    child: CircularProgressIndicator(strokeWidth: 2),
+                  )
+                else if (extension.hasUpdate)
+                  FilledButton.tonal(
+                    onPressed: onUpdate,
+                    style: FilledButton.styleFrom(
+                      padding: const EdgeInsets.symmetric(horizontal: 12),
+                      minimumSize: const Size(0, 36),
+                    ),
+                    child: const Text('Update'),
+                  )
+                else if (extension.isInstalled)
+                  OutlinedButton(
+                    onPressed: null,
+                    style: OutlinedButton.styleFrom(
+                      padding: const EdgeInsets.symmetric(horizontal: 12),
+                      minimumSize: const Size(0, 36),
+                    ),
+                    child: Row(
+                      mainAxisSize: MainAxisSize.min,
+                      children: [
+                        Icon(Icons.check, size: 16, color: colorScheme.outline),
+                        const SizedBox(width: 4),
+                        Text(
+                          'Installed',
+                          style: TextStyle(color: colorScheme.outline),
+                        ),
+                      ],
+                    ),
+                  )
+                else
+                  FilledButton(
+                    onPressed: onInstall,
+                    style: FilledButton.styleFrom(
+                      padding: const EdgeInsets.symmetric(horizontal: 12),
+                      minimumSize: const Size(0, 36),
+                    ),
+                    child: const Text('Install'),
+                  ),
+              ],
+            ),
+          ),
+        ),
+        if (showDivider)
+          Divider(
+            height: 1,
+            thickness: 1,
+            indent: 76,
+            endIndent: 16,
+            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+          ),
+      ],
+    );
+  }
+}
@@ -34,7 +34,13 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
  }

  Future<void> _checkFile() async {
-    final file = File(widget.item.filePath);
+    // Strip EXISTS: prefix from legacy history items
+    var filePath = widget.item.filePath;
+    if (filePath.startsWith('EXISTS:')) {
+      filePath = filePath.substring(7);
+    }
+    
+    final file = File(filePath);
    final exists = await file.exists();
    int? size;
    
@@ -67,6 +73,12 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
  int? get discNumber => item.discNumber;
  String? get releaseDate => item.releaseDate;
  String? get isrc => item.isrc;
+  
+  // Clean filePath - strip EXISTS: prefix from legacy history items
+  String get cleanFilePath {
+    final path = item.filePath;
+    return path.startsWith('EXISTS:') ? path.substring(7) : path;
+  }
  int? get bitDepth => item.bitDepth;
  int? get sampleRate => item.sampleRate;

@@ -353,19 +365,24 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
            // Metadata grid
            _buildMetadataGrid(context, colorScheme),
            
-            // Spotify link button
+            // Streaming service link button
            if (item.spotifyId != null && item.spotifyId!.isNotEmpty) ...[
              const SizedBox(height: 8),
-              OutlinedButton.icon(
-                onPressed: () => _openSpotifyUrl(context),
-                icon: const Icon(Icons.open_in_new, size: 18),
-                label: const Text('Open in Spotify'),
-                style: OutlinedButton.styleFrom(
-                  padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
-                  shape: RoundedRectangleBorder(
-                    borderRadius: BorderRadius.circular(12),
-                  ),
-                ),
+              Builder(
+                builder: (context) {
+                  final isDeezer = item.spotifyId!.contains('deezer');
+                  return OutlinedButton.icon(
+                    onPressed: () => _openServiceUrl(context),
+                    icon: const Icon(Icons.open_in_new, size: 18),
+                    label: Text(isDeezer ? 'Open in Deezer' : 'Open in Spotify'),
+                    style: OutlinedButton.styleFrom(
+                      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
+                      shape: RoundedRectangleBorder(
+                        borderRadius: BorderRadius.circular(12),
+                      ),
+                    ),
+                  );
+                }
              ),
            ],
          ],
@@ -374,16 +391,24 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
    );
  }

-  Future<void> _openSpotifyUrl(BuildContext context) async {
+  Future<void> _openServiceUrl(BuildContext context) async {
    if (item.spotifyId == null) return;
    
-    final webUrl = 'https://open.spotify.com/track/${item.spotifyId}';
-    final spotifyUri = Uri.parse('spotify:track:${item.spotifyId}');
+    final isDeezer = item.spotifyId!.contains('deezer');
+    final rawId = item.spotifyId!.replaceAll('deezer:', '');
+    
+    final webUrl = isDeezer 
+        ? 'https://www.deezer.com/track/$rawId'
+        : 'https://open.spotify.com/track/$rawId';
+        
+    final appUri = isDeezer
+        ? Uri.parse('deezer://www.deezer.com/track/$rawId')
+        : Uri.parse('spotify:track:$rawId');
    
    try {
-      // Try to open in Spotify app first using URI scheme
+      // Try to open in App first using URI scheme
      final launched = await launchUrl(
-        spotifyUri,
+        appUri,
        mode: LaunchMode.externalApplication,
      );
      
@@ -406,7 +431,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
        if (context.mounted) {
          _copyToClipboard(context, webUrl);
          ScaffoldMessenger.of(context).showSnackBar(
-            const SnackBar(content: Text('Spotify URL copied to clipboard')),
+            SnackBar(content: Text('${isDeezer ? 'Deezer' : 'Spotify'} URL copied to clipboard')),
          );
        }
      }
@@ -429,7 +454,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
      _MetadataItem('Album', albumName),
      if (trackNumber != null && trackNumber! > 0)
        _MetadataItem('Track number', trackNumber.toString()),
-      if (discNumber != null && discNumber! > 1)
+      if (discNumber != null && discNumber! > 0)
        _MetadataItem('Disc number', discNumber.toString()),
      if (item.duration != null)
        _MetadataItem('Duration', _formatDuration(item.duration!)),
@@ -439,11 +464,18 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
        _MetadataItem('Release date', releaseDate!),
      if (isrc != null && isrc!.isNotEmpty)
        _MetadataItem('ISRC', isrc!),
-      if (item.spotifyId != null && item.spotifyId!.isNotEmpty)
-        _MetadataItem('Spotify ID', item.spotifyId!),
+    ];
+    
+    if (item.spotifyId != null && item.spotifyId!.isNotEmpty) {
+      final isDeezer = item.spotifyId!.contains('deezer');
+      final cleanId = item.spotifyId!.replaceAll('deezer:', '');
+      items.add(_MetadataItem(isDeezer ? 'Deezer ID' : 'Spotify ID', cleanId));
+    }
+    
+    items.addAll([
      _MetadataItem('Service', item.service.toUpperCase()),
      _MetadataItem('Downloaded', _formatFullDate(item.downloadedAt)),
-    ];
+    ]);

    return Column(
      children: items.map((metadata) {
@@ -495,7 +527,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
  }

  Widget _buildFileInfoCard(BuildContext context, ColorScheme colorScheme, bool fileExists, int? fileSize) {
-    final fileName = item.filePath.split(Platform.pathSeparator).last;
+    final fileName = cleanFilePath.split(Platform.pathSeparator).last;
    final fileExtension = fileName.contains('.') ? fileName.split('.').last.toUpperCase() : 'Unknown';
    
    return Card(
@@ -611,7 +643,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
            
            // File path
            InkWell(
-              onTap: () => _copyToClipboard(context, item.filePath),
+              onTap: () => _copyToClipboard(context, cleanFilePath),
              borderRadius: BorderRadius.circular(12),
              child: Container(
                padding: const EdgeInsets.all(12),
@@ -623,7 +655,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
                  children: [
                    Expanded(
                      child: Text(
-                        item.filePath,
+                        cleanFilePath,
                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
                          fontFamily: 'monospace',
                          color: colorScheme.onSurfaceVariant,
@@ -756,7 +788,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
        item.spotifyId ?? '',
        item.trackName,
        item.artistName,
-        filePath: _fileExists ? item.filePath : null, // Try embedded lyrics first
+        filePath: _fileExists ? cleanFilePath : null, // Try embedded lyrics first
      ).timeout(
        const Duration(seconds: 20),
        onTimeout: () => '', // Return empty string on timeout
@@ -813,7 +845,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
        Expanded(
          flex: 2,
          child: FilledButton.icon(
-            onPressed: fileExists ? () => _openFile(context, item.filePath) : null,
+            onPressed: fileExists ? () => _openFile(context, cleanFilePath) : null,
            icon: const Icon(Icons.play_arrow),
            label: const Text('Play'),
            style: FilledButton.styleFrom(
@@ -870,7 +902,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
              title: const Text('Copy file path'),
              onTap: () {
                Navigator.pop(context);
-                _copyToClipboard(context, item.filePath);
+                _copyToClipboard(context, cleanFilePath);
              },
            ),
            ListTile(
@@ -913,7 +945,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
            onPressed: () async {
              // Delete the file first
              try {
-                final file = File(item.filePath);
+                final file = File(cleanFilePath);
                if (await file.exists()) {
                  await file.delete();
                }
@@ -964,7 +996,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
  }

  Future<void> _shareFile(BuildContext context) async {
-    final file = File(item.filePath);
+    final file = File(cleanFilePath);
    if (!await file.exists()) {
      if (context.mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
@@ -976,7 +1008,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
    
    await SharePlus.instance.share(
      ShareParams(
-        files: [XFile(item.filePath)],
+        files: [XFile(cleanFilePath)],
        text: '${item.trackName} - ${item.artistName}',
      ),
    );
@@ -0,0 +1,256 @@
+import 'dart:io';
+import 'package:file_picker/file_picker.dart';
+import 'package:spotiflac_android/models/track.dart';
+import 'package:spotiflac_android/services/platform_bridge.dart';
+import 'package:spotiflac_android/utils/logger.dart';
+
+class CsvImportService {
+  static final _log = AppLogger('CsvImportService');
+
+  /// Pick and parse CSV file, then enrich metadata from Deezer
+  /// [onProgress] callback receives (current, total) for progress updates
+  static Future<List<Track>> pickAndParseCsv({
+    void Function(int current, int total)? onProgress,
+  }) async {
+    try {
+      final FilePickerResult? result = await FilePicker.platform.pickFiles(
+        type: FileType.custom,
+        allowedExtensions: ['csv'],
+      );
+
+      if (result != null && result.files.single.path != null) {
+        final file = File(result.files.single.path!);
+        final content = await file.readAsString();
+        final tracks = _parseCsv(content);
+        
+        // Enrich tracks with metadata from Deezer (cover URL, duration, etc.)
+        if (tracks.isNotEmpty) {
+          return await _enrichTracksMetadata(tracks, onProgress: onProgress);
+        }
+        return tracks;
+      }
+    } catch (e) {
+      _log.e('Error picking/parsing CSV: $e');
+    }
+    return [];
+  }
+
+  /// Enrich tracks with metadata from Deezer using ISRC or search
+  /// This fetches cover URL, duration, and other metadata that CSV doesn't have
+  static Future<List<Track>> _enrichTracksMetadata(
+    List<Track> tracks, {
+    void Function(int current, int total)? onProgress,
+  }) async {
+    _log.i('Enriching metadata for ${tracks.length} tracks from Deezer...');
+    final enrichedTracks = <Track>[];
+    
+    for (int i = 0; i < tracks.length; i++) {
+      final track = tracks[i];
+      onProgress?.call(i + 1, tracks.length);
+      
+      // Only enrich if missing cover/duration
+      if (track.coverUrl == null || track.duration == 0) {
+        Map<String, dynamic>? trackData;
+        
+        // Try ISRC first if available
+        if (track.isrc != null && track.isrc!.isNotEmpty) {
+          try {
+            trackData = await PlatformBridge.searchDeezerByISRC(track.isrc!);
+            _log.d('ISRC enrichment success for ${track.name}');
+          } catch (e) {
+            _log.w('ISRC search failed for ${track.name}, trying text search...');
+          }
+        }
+        
+        // Fallback to text search if ISRC failed or not available
+        if (trackData == null) {
+          try {
+            final query = '${track.artistName} ${track.name}';
+            final searchResult = await PlatformBridge.searchDeezerAll(query, trackLimit: 5);
+            
+            if (searchResult.containsKey('tracks')) {
+              final tracksList = searchResult['tracks'] as List<dynamic>?;
+              if (tracksList != null && tracksList.isNotEmpty) {
+                // Find best match by comparing names
+                for (final result in tracksList) {
+                  final resultMap = result as Map<String, dynamic>;
+                  final resultName = (resultMap['name'] as String?)?.toLowerCase() ?? '';
+                  final trackNameLower = track.name.toLowerCase();
+                  
+                  // Check if track name matches (contains or equals)
+                  if (resultName.contains(trackNameLower) || trackNameLower.contains(resultName)) {
+                    trackData = resultMap;
+                    _log.d('Text search match for ${track.name}: $resultName');
+                    break;
+                  }
+                }
+                
+                // If no exact match, use first result
+                if (trackData == null && tracksList.isNotEmpty) {
+                  trackData = tracksList.first as Map<String, dynamic>;
+                  _log.d('Using first search result for ${track.name}');
+                }
+              }
+            }
+          } catch (e) {
+            _log.w('Text search also failed for ${track.name}: $e');
+          }
+        }
+        
+        // Apply enriched data if found
+        if (trackData != null) {
+          final coverUrl = trackData['images'] as String?;
+          final durationMs = trackData['duration_ms'] as int? ?? 0;
+          final deezerIdRaw = trackData['spotify_id'] as String?;
+          
+          enrichedTracks.add(Track(
+            id: deezerIdRaw ?? track.id,
+            name: trackData['name'] as String? ?? track.name,
+            artistName: trackData['artists'] as String? ?? track.artistName,
+            albumName: trackData['album_name'] as String? ?? track.albumName,
+            albumArtist: trackData['album_artist'] as String?,
+            coverUrl: coverUrl ?? track.coverUrl,
+            isrc: trackData['isrc'] as String? ?? track.isrc,
+            duration: durationMs > 0 ? durationMs ~/ 1000 : track.duration,
+            trackNumber: trackData['track_number'] as int? ?? track.trackNumber,
+            discNumber: trackData['disc_number'] as int? ?? track.discNumber,
+            releaseDate: trackData['release_date'] as String? ?? track.releaseDate,
+          ));
+          
+          _log.d('Enriched: ${track.name} - cover: ${coverUrl != null}, duration: ${durationMs ~/ 1000}s');
+          
+          // Small delay to avoid rate limiting
+          if (i < tracks.length - 1) {
+            await Future.delayed(const Duration(milliseconds: 100));
+          }
+          continue;
+        }
+      }
+      
+      // Keep original track if enrichment failed or not needed
+      enrichedTracks.add(track);
+    }
+    
+    _log.i('Enrichment complete: ${enrichedTracks.length} tracks');
+    return enrichedTracks;
+  }
+
+  static List<Track> _parseCsv(String content) {
+    final List<Track> tracks = [];
+    final lines = content.split(RegExp(r'\r\n|\r|\n')); // Handle various newline formats
+    if (lines.isEmpty) return tracks;
+
+    // Detect headers line (assume first non-empty line)
+    int startIdx = 0;
+    while (startIdx < lines.length && lines[startIdx].trim().isEmpty) {
+      startIdx++;
+    }
+    if (startIdx >= lines.length) return tracks;
+
+    final headers = _parseLine(lines[startIdx]);
+    final colMap = <String, int>{};
+    for (int i = 0; i < headers.length; i++) {
+        // Normalize header: lowercase, trim, remove quotes
+        String h = _cleanValue(headers[i]).toLowerCase();
+        colMap[h] = i;
+    }
+
+    _log.d('CSV Headers: ${colMap.keys.toList()}');
+
+    // Parse rows
+    for (int i = startIdx + 1; i < lines.length; i++) {
+      final line = lines[i].trim();
+      if (line.isEmpty) continue;
+
+      final values = _parseLine(line);
+      
+      // Helper to get value securely
+      String? getVal(List<String> keys) {
+        return _getValue(values, colMap, keys);
+      }
+
+      String? trackName = getVal(['track name', 'track', 'name', 'title']);
+      String? artistName = getVal(['artist name', 'artist']);
+      String? albumName = getVal(['album name', 'album']);
+      String? isrc = getVal(['isrc']); // Often formatted with leading/trailing quotes
+      String? spotifyId = getVal(['spotify - id', 'spotify id', 'id', 'uri']); // Uri might need parsing
+
+      // If 'spotify uri' contains the id: 'spotify:track:ID'
+      if (spotifyId != null && spotifyId.startsWith('spotify:track:')) {
+        spotifyId = spotifyId.replaceAll('spotify:track:', '');
+      }
+
+      // Basic validation: Need at least name and artist, OR a spotify ID
+      if ((trackName != null && trackName.isNotEmpty && artistName != null) || (spotifyId != null && spotifyId.isNotEmpty)) {
+          tracks.add(Track(
+              id: spotifyId ?? 'csv_${DateTime.now().millisecondsSinceEpoch}_$i', 
+              name: trackName ?? 'Unknown Track',
+              artistName: artistName ?? 'Unknown Artist',
+              albumName: albumName ?? 'Unknown Album',
+              isrc: isrc,
+              duration: 0, // Will be updated by enrichment later
+              coverUrl: null, // Will be fetched by enrichment
+          ));
+      }
+    }
+    
+    _log.i('Parsed ${tracks.length} tracks from CSV');
+    return tracks;
+  }
+  
+  static String? _getValue(List<String> values, Map<String, int> colMap, List<String> possibleKeys) {
+      for (final key in possibleKeys) {
+          if (colMap.containsKey(key)) {
+              final index = colMap[key]!;
+              if (index < values.length) {
+                   return _cleanValue(values[index]);
+              }
+          }
+      }
+      return null;
+  }
+
+  static String _cleanValue(String val) {
+    val = val.trim();
+    if (val.startsWith('"') && val.endsWith('"') && val.length >= 2) {
+      val = val.substring(1, val.length - 1);
+    }
+    // Handle double quotes escape in CSV ("" -> ")
+    val = val.replaceAll('""', '"');
+    return val;
+  }
+
+  // Robust CSV Line Parser
+  static List<String> _parseLine(String line) {
+     final List<String> result = [];
+     bool inQuote = false;
+     StringBuffer buffer = StringBuffer();
+     
+     for (int i=0; i<line.length; i++) {
+         String char = line[i];
+         if (char == '"') {
+             // Look ahead to check for escaped quote
+             if (i + 1 < line.length && line[i+1] == '"') {
+                buffer.write('"'); // Keep format for now, _cleanValue handles unescaping logic differently... 
+                // Wait, standard CSV: "Thumb ""Up""" -> Thumb "Up"
+                // My _cleanValue handles it, so I should just preserve raw content here mostly, 
+                // BUT I need to know if " toggles inQuote.
+                // Escaped "" does NOT toggle inQuote mode effectively (it counts as literal char inside quote).
+                buffer.write('"'); // Write 1st quote
+                i++; // Skip next quote char loop
+                buffer.write('"'); // Write 2nd quote
+             } else {
+                inQuote = !inQuote;
+                buffer.write(char);
+             }
+         } else if (char == ',' && !inQuote) {
+             result.add(buffer.toString());
+             buffer.clear();
+         } else {
+             buffer.write(char);
+         }
+     }
+     result.add(buffer.toString());
+     return result;
+  }
+}
@@ -1,5 +1,8 @@
 import 'dart:convert';
 import 'package:flutter/services.dart';
+import 'package:spotiflac_android/utils/logger.dart';
+
+final _log = AppLogger('PlatformBridge');

 /// Bridge to communicate with Go backend via platform channels
 class PlatformBridge {
@@ -7,18 +10,21 @@ class PlatformBridge {

  /// Parse and validate Spotify URL
  static Future<Map<String, dynamic>> parseSpotifyUrl(String url) async {
+    _log.d('parseSpotifyUrl: $url');
    final result = await _channel.invokeMethod('parseSpotifyUrl', {'url': url});
    return jsonDecode(result as String) as Map<String, dynamic>;
  }

  /// Get Spotify metadata from URL
  static Future<Map<String, dynamic>> getSpotifyMetadata(String url) async {
+    _log.d('getSpotifyMetadata: $url');
    final result = await _channel.invokeMethod('getSpotifyMetadata', {'url': url});
    return jsonDecode(result as String) as Map<String, dynamic>;
  }

  /// Search Spotify
  static Future<Map<String, dynamic>> searchSpotify(String query, {int limit = 10}) async {
+    _log.d('searchSpotify: "$query" (limit: $limit)');
    final result = await _channel.invokeMethod('searchSpotify', {
      'query': query,
      'limit': limit,
@@ -28,6 +34,7 @@ class PlatformBridge {

  /// Search Spotify for tracks and artists
  static Future<Map<String, dynamic>> searchSpotifyAll(String query, {int trackLimit = 15, int artistLimit = 3}) async {
+    _log.d('searchSpotifyAll: "$query"');
    final result = await _channel.invokeMethod('searchSpotifyAll', {
      'query': query,
      'track_limit': trackLimit,
@@ -38,6 +45,7 @@ class PlatformBridge {

  /// Check track availability on streaming services
  static Future<Map<String, dynamic>> checkAvailability(String spotifyId, String isrc) async {
+    _log.d('checkAvailability: $spotifyId (ISRC: $isrc)');
    final result = await _channel.invokeMethod('checkAvailability', {
      'spotify_id': spotifyId,
      'isrc': isrc,
@@ -67,6 +75,7 @@ class PlatformBridge {
    String? itemId,
    int durationMs = 0,
  }) async {
+    _log.i('downloadTrack: "$trackName" by $artistName via $service');
    final request = jsonEncode({
      'isrc': isrc,
      'service': service,
@@ -90,7 +99,13 @@ class PlatformBridge {
    });
    
    final result = await _channel.invokeMethod('downloadTrack', request);
-    return jsonDecode(result as String) as Map<String, dynamic>;
+    final response = jsonDecode(result as String) as Map<String, dynamic>;
+    if (response['success'] == true) {
+      _log.i('Download success: ${response['file_path']}');
+    } else {
+      _log.w('Download failed: ${response['error']}');
+    }
+    return response;
  }

  /// Download with automatic fallback to other services
@@ -115,6 +130,7 @@ class PlatformBridge {
    String? itemId,
    int durationMs = 0,
  }) async {
+    _log.i('downloadWithFallback: "$trackName" by $artistName (preferred: $preferredService)');
    final request = jsonEncode({
      'isrc': isrc,
      'service': preferredService,
@@ -138,7 +154,22 @@ class PlatformBridge {
    });
    
    final result = await _channel.invokeMethod('downloadWithFallback', request);
-    return jsonDecode(result as String) as Map<String, dynamic>;
+    final response = jsonDecode(result as String) as Map<String, dynamic>;
+    if (response['success'] == true) {
+      final service = response['service'] ?? 'unknown';
+      final filePath = response['file_path'] ?? '';
+      final bitDepth = response['actual_bit_depth'];
+      final sampleRate = response['actual_sample_rate'];
+      final qualityStr = bitDepth != null && sampleRate != null 
+          ? ' ($bitDepth-bit/${(sampleRate / 1000).toStringAsFixed(1)}kHz)'
+          : '';
+      _log.i('Download success via $service$qualityStr: $filePath');
+    } else {
+      final error = response['error'] ?? 'Unknown error';
+      final errorType = response['error_type'] ?? '';
+      _log.e('Download failed: $error (type: $errorType)');
+    }
+    return response;
  }

  /// Get download progress (legacy single download)
@@ -300,7 +331,6 @@ class PlatformBridge {
  }

  /// Set custom Spotify API credentials
-  /// Pass empty strings to use default credentials
  static Future<void> setSpotifyCredentials(String clientId, String clientSecret) async {
    await _channel.invokeMethod('setSpotifyCredentials', {
      'client_id': clientId,
@@ -308,6 +338,13 @@ class PlatformBridge {
    });
  }

+  /// Check if Spotify credentials are configured
+  /// Returns true if credentials are available (custom or env vars)
+  static Future<bool> hasSpotifyCredentials() async {
+    final result = await _channel.invokeMethod('hasSpotifyCredentials');
+    return result as bool;
+  }
+
  /// Pre-warm track ID cache for album/playlist tracks
  /// This runs in background and returns immediately
  /// Speeds up subsequent downloads by caching ISRC → Track ID mappings
@@ -377,4 +414,449 @@ class PlatformBridge {
    final result = await _channel.invokeMethod('getSpotifyMetadataWithFallback', {'url': url});
    return jsonDecode(result as String) as Map<String, dynamic>;
  }
+
+  // ==================== GO BACKEND LOGS ====================
+
+  /// Get all logs from Go backend
+  static Future<List<Map<String, dynamic>>> getGoLogs() async {
+    final result = await _channel.invokeMethod('getLogs');
+    final logs = jsonDecode(result as String) as List<dynamic>;
+    return logs.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  /// Get logs since a specific index (for incremental updates)
+  static Future<Map<String, dynamic>> getGoLogsSince(int index) async {
+    final result = await _channel.invokeMethod('getLogsSince', {'index': index});
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Clear Go backend logs
+  static Future<void> clearGoLogs() async {
+    await _channel.invokeMethod('clearLogs');
+  }
+
+  /// Get Go backend log count
+  static Future<int> getGoLogCount() async {
+    final result = await _channel.invokeMethod('getLogCount');
+    return result as int;
+  }
+
+  /// Enable or disable Go backend logging
+  static Future<void> setGoLoggingEnabled(bool enabled) async {
+    await _channel.invokeMethod('setLoggingEnabled', {'enabled': enabled});
+  }
+
+  // ==================== EXTENSION SYSTEM ====================
+
+  /// Initialize the extension system
+  static Future<void> initExtensionSystem(String extensionsDir, String dataDir) async {
+    _log.d('initExtensionSystem: $extensionsDir, $dataDir');
+    await _channel.invokeMethod('initExtensionSystem', {
+      'extensions_dir': extensionsDir,
+      'data_dir': dataDir,
+    });
+  }
+
+  /// Load all extensions from directory
+  static Future<Map<String, dynamic>> loadExtensionsFromDir(String dirPath) async {
+    _log.d('loadExtensionsFromDir: $dirPath');
+    final result = await _channel.invokeMethod('loadExtensionsFromDir', {
+      'dir_path': dirPath,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Load a single extension from file
+  static Future<Map<String, dynamic>> loadExtensionFromPath(String filePath) async {
+    _log.d('loadExtensionFromPath: $filePath');
+    final result = await _channel.invokeMethod('loadExtensionFromPath', {
+      'file_path': filePath,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Unload an extension
+  static Future<void> unloadExtension(String extensionId) async {
+    _log.d('unloadExtension: $extensionId');
+    await _channel.invokeMethod('unloadExtension', {
+      'extension_id': extensionId,
+    });
+  }
+
+  /// Remove an extension completely (unload + delete files)
+  static Future<void> removeExtension(String extensionId) async {
+    _log.d('removeExtension: $extensionId');
+    await _channel.invokeMethod('removeExtension', {
+      'extension_id': extensionId,
+    });
+  }
+
+  /// Upgrade an existing extension from a new package file
+  static Future<Map<String, dynamic>> upgradeExtension(String filePath) async {
+    _log.d('upgradeExtension: $filePath');
+    final result = await _channel.invokeMethod('upgradeExtension', {
+      'file_path': filePath,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Check if a package file is an upgrade for an existing extension
+  static Future<Map<String, dynamic>> checkExtensionUpgrade(String filePath) async {
+    _log.d('checkExtensionUpgrade: $filePath');
+    final result = await _channel.invokeMethod('checkExtensionUpgrade', {
+      'file_path': filePath,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Get all installed extensions
+  static Future<List<Map<String, dynamic>>> getInstalledExtensions() async {
+    final result = await _channel.invokeMethod('getInstalledExtensions');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  /// Enable or disable an extension
+  static Future<void> setExtensionEnabled(String extensionId, bool enabled) async {
+    _log.d('setExtensionEnabled: $extensionId = $enabled');
+    await _channel.invokeMethod('setExtensionEnabled', {
+      'extension_id': extensionId,
+      'enabled': enabled,
+    });
+  }
+
+  /// Set provider priority order
+  static Future<void> setProviderPriority(List<String> providerIds) async {
+    _log.d('setProviderPriority: $providerIds');
+    await _channel.invokeMethod('setProviderPriority', {
+      'priority': jsonEncode(providerIds),
+    });
+  }
+
+  /// Get provider priority order
+  static Future<List<String>> getProviderPriority() async {
+    final result = await _channel.invokeMethod('getProviderPriority');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as String).toList();
+  }
+
+  /// Set metadata provider priority order
+  static Future<void> setMetadataProviderPriority(List<String> providerIds) async {
+    _log.d('setMetadataProviderPriority: $providerIds');
+    await _channel.invokeMethod('setMetadataProviderPriority', {
+      'priority': jsonEncode(providerIds),
+    });
+  }
+
+  /// Get metadata provider priority order
+  static Future<List<String>> getMetadataProviderPriority() async {
+    final result = await _channel.invokeMethod('getMetadataProviderPriority');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as String).toList();
+  }
+
+  /// Get extension settings
+  static Future<Map<String, dynamic>> getExtensionSettings(String extensionId) async {
+    final result = await _channel.invokeMethod('getExtensionSettings', {
+      'extension_id': extensionId,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Set extension settings
+  static Future<void> setExtensionSettings(String extensionId, Map<String, dynamic> settings) async {
+    _log.d('setExtensionSettings: $extensionId');
+    await _channel.invokeMethod('setExtensionSettings', {
+      'extension_id': extensionId,
+      'settings': jsonEncode(settings),
+    });
+  }
+
+  /// Search tracks using extension providers
+  static Future<List<Map<String, dynamic>>> searchTracksWithExtensions(String query, {int limit = 20}) async {
+    _log.d('searchTracksWithExtensions: "$query"');
+    final result = await _channel.invokeMethod('searchTracksWithExtensions', {
+      'query': query,
+      'limit': limit,
+    });
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  /// Download with extension providers (includes fallback)
+  static Future<Map<String, dynamic>> downloadWithExtensions({
+    required String isrc,
+    required String spotifyId,
+    required String trackName,
+    required String artistName,
+    required String albumName,
+    String? albumArtist,
+    String? coverUrl,
+    required String outputDir,
+    required String filenameFormat,
+    String quality = 'LOSSLESS',
+    bool embedLyrics = true,
+    bool embedMaxQualityCover = true,
+    int trackNumber = 1,
+    int discNumber = 1,
+    int totalTracks = 1,
+    String? releaseDate,
+    String? itemId,
+    int durationMs = 0,
+    String? source, // Extension ID that provided this track (prioritize this extension)
+  }) async {
+    _log.i('downloadWithExtensions: "$trackName" by $artistName${source != null ? ' (source: $source)' : ''}');
+    final request = jsonEncode({
+      'isrc': isrc,
+      'spotify_id': spotifyId,
+      'track_name': trackName,
+      'artist_name': artistName,
+      'album_name': albumName,
+      'album_artist': albumArtist ?? artistName,
+      'cover_url': coverUrl,
+      'output_dir': outputDir,
+      'filename_format': filenameFormat,
+      'quality': quality,
+      'embed_lyrics': embedLyrics,
+      'embed_max_quality_cover': embedMaxQualityCover,
+      'track_number': trackNumber,
+      'disc_number': discNumber,
+      'total_tracks': totalTracks,
+      'release_date': releaseDate ?? '',
+      'item_id': itemId ?? '',
+      'duration_ms': durationMs,
+      'source': source ?? '', // Extension ID that provided this track
+    });
+    
+    final result = await _channel.invokeMethod('downloadWithExtensions', request);
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Cleanup all extensions (call on app close)
+  static Future<void> cleanupExtensions() async {
+    _log.d('cleanupExtensions');
+    await _channel.invokeMethod('cleanupExtensions');
+  }
+
+  // ==================== EXTENSION AUTH API ====================
+
+  /// Get pending auth request for an extension (if any)
+  static Future<Map<String, dynamic>?> getExtensionPendingAuth(String extensionId) async {
+    final result = await _channel.invokeMethod('getExtensionPendingAuth', {
+      'extension_id': extensionId,
+    });
+    if (result == null) return null;
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Set auth code for an extension (after OAuth callback)
+  static Future<void> setExtensionAuthCode(String extensionId, String authCode) async {
+    _log.d('setExtensionAuthCode: $extensionId');
+    await _channel.invokeMethod('setExtensionAuthCode', {
+      'extension_id': extensionId,
+      'auth_code': authCode,
+    });
+  }
+
+  /// Set tokens for an extension (after token exchange)
+  static Future<void> setExtensionTokens(
+    String extensionId, {
+    required String accessToken,
+    String? refreshToken,
+    int? expiresIn,
+  }) async {
+    _log.d('setExtensionTokens: $extensionId');
+    await _channel.invokeMethod('setExtensionTokens', {
+      'extension_id': extensionId,
+      'access_token': accessToken,
+      'refresh_token': refreshToken ?? '',
+      'expires_in': expiresIn ?? 0,
+    });
+  }
+
+  /// Clear pending auth request for an extension
+  static Future<void> clearExtensionPendingAuth(String extensionId) async {
+    await _channel.invokeMethod('clearExtensionPendingAuth', {
+      'extension_id': extensionId,
+    });
+  }
+
+  /// Check if extension is authenticated
+  static Future<bool> isExtensionAuthenticated(String extensionId) async {
+    final result = await _channel.invokeMethod('isExtensionAuthenticated', {
+      'extension_id': extensionId,
+    });
+    return result as bool;
+  }
+
+  /// Get all pending auth requests (for polling)
+  static Future<List<Map<String, dynamic>>> getAllPendingAuthRequests() async {
+    final result = await _channel.invokeMethod('getAllPendingAuthRequests');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  // ==================== EXTENSION FFMPEG API ====================
+
+  /// Get pending FFmpeg command for execution
+  static Future<Map<String, dynamic>?> getPendingFFmpegCommand(String commandId) async {
+    final result = await _channel.invokeMethod('getPendingFFmpegCommand', {
+      'command_id': commandId,
+    });
+    if (result == null) return null;
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Set FFmpeg command result
+  static Future<void> setFFmpegCommandResult(
+    String commandId, {
+    required bool success,
+    String output = '',
+    String error = '',
+  }) async {
+    await _channel.invokeMethod('setFFmpegCommandResult', {
+      'command_id': commandId,
+      'success': success,
+      'output': output,
+      'error': error,
+    });
+  }
+
+  /// Get all pending FFmpeg commands
+  static Future<List<Map<String, dynamic>>> getAllPendingFFmpegCommands() async {
+    final result = await _channel.invokeMethod('getAllPendingFFmpegCommands');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  // ==================== EXTENSION CUSTOM SEARCH ====================
+
+  /// Perform custom search using an extension
+  static Future<List<Map<String, dynamic>>> customSearchWithExtension(
+    String extensionId,
+    String query, {
+    Map<String, dynamic>? options,
+  }) async {
+    final result = await _channel.invokeMethod('customSearchWithExtension', {
+      'extension_id': extensionId,
+      'query': query,
+      'options': options != null ? jsonEncode(options) : '',
+    });
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  /// Get all extensions that provide custom search
+  static Future<List<Map<String, dynamic>>> getSearchProviders() async {
+    final result = await _channel.invokeMethod('getSearchProviders');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  // ==================== EXTENSION URL HANDLER ====================
+
+  /// Handle a URL with any matching extension
+  /// Returns null if no extension can handle the URL
+  static Future<Map<String, dynamic>?> handleURLWithExtension(String url) async {
+    try {
+      final result = await _channel.invokeMethod('handleURLWithExtension', {
+        'url': url,
+      });
+      if (result == null || result == '') return null;
+      return jsonDecode(result as String) as Map<String, dynamic>;
+    } catch (e) {
+      // No extension found or error handling URL
+      return null;
+    }
+  }
+
+  /// Find an extension that can handle the given URL
+  /// Returns extension ID or null if none found
+  static Future<String?> findURLHandler(String url) async {
+    final result = await _channel.invokeMethod('findURLHandler', {
+      'url': url,
+    });
+    if (result == null || result == '') return null;
+    return result as String;
+  }
+
+  /// Get all extensions that handle custom URLs
+  static Future<List<Map<String, dynamic>>> getURLHandlers() async {
+    final result = await _channel.invokeMethod('getURLHandlers');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  // ==================== EXTENSION POST-PROCESSING ====================
+
+  /// Run post-processing hooks on a file
+  static Future<Map<String, dynamic>> runPostProcessing(
+    String filePath, {
+    Map<String, dynamic>? metadata,
+  }) async {
+    final result = await _channel.invokeMethod('runPostProcessing', {
+      'file_path': filePath,
+      'metadata': metadata != null ? jsonEncode(metadata) : '',
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Get all extensions that provide post-processing
+  static Future<List<Map<String, dynamic>>> getPostProcessingProviders() async {
+    final result = await _channel.invokeMethod('getPostProcessingProviders');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  // ==================== EXTENSION STORE ====================
+
+  /// Initialize extension store
+  static Future<void> initExtensionStore(String cacheDir) async {
+    _log.d('initExtensionStore: $cacheDir');
+    await _channel.invokeMethod('initExtensionStore', {'cache_dir': cacheDir});
+  }
+
+  /// Get all extensions from store with installation status
+  static Future<List<Map<String, dynamic>>> getStoreExtensions({bool forceRefresh = false}) async {
+    _log.d('getStoreExtensions (forceRefresh: $forceRefresh)');
+    final result = await _channel.invokeMethod('getStoreExtensions', {
+      'force_refresh': forceRefresh,
+    });
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  /// Search extensions in store
+  static Future<List<Map<String, dynamic>>> searchStoreExtensions(String query, {String? category}) async {
+    _log.d('searchStoreExtensions: "$query" (category: $category)');
+    final result = await _channel.invokeMethod('searchStoreExtensions', {
+      'query': query,
+      'category': category ?? '',
+    });
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  /// Get store categories
+  static Future<List<String>> getStoreCategories() async {
+    final result = await _channel.invokeMethod('getStoreCategories');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.cast<String>();
+  }
+
+  /// Download extension from store
+  static Future<String> downloadStoreExtension(String extensionId, String destDir) async {
+    _log.i('downloadStoreExtension: $extensionId to $destDir');
+    final result = await _channel.invokeMethod('downloadStoreExtension', {
+      'extension_id': extensionId,
+      'dest_dir': destDir,
+    });
+    return result as String;
+  }
+
+  /// Clear store cache
+  static Future<void> clearStoreCache() async {
+    _log.d('clearStoreCache');
+    await _channel.invokeMethod('clearStoreCache');
+  }
 }
@@ -7,11 +7,9 @@ class AppTheme {
  static const Color defaultSeedColor = Color(kDefaultSeedColor);

  /// Create light theme
-  static ThemeData light({
-    ColorScheme? dynamicScheme,
-    Color? seedColor,
-  }) {
-    final scheme = dynamicScheme ??
+  static ThemeData light({ColorScheme? dynamicScheme, Color? seedColor}) {
+    final scheme =
+        dynamicScheme ??
        ColorScheme.fromSeed(
          seedColor: seedColor ?? defaultSeedColor,
          brightness: Brightness.light,
@@ -45,7 +43,8 @@ class AppTheme {
    Color? seedColor,
    bool isAmoled = false,
  }) {
-    final scheme = dynamicScheme ??
+    final scheme =
+        dynamicScheme ??
        ColorScheme.fromSeed(
          seedColor: seedColor ?? defaultSeedColor,
          brightness: Brightness.dark,
@@ -75,34 +74,41 @@ class AppTheme {
  }

  /// AppBar theme
-  static AppBarTheme _appBarTheme(ColorScheme scheme, {bool isAmoled = false}) => AppBarTheme(
-        elevation: 0,
-        scrolledUnderElevation: isAmoled ? 0 : 3,
-        backgroundColor: isAmoled ? Colors.black : scheme.surface,
-        foregroundColor: scheme.onSurface,
-        surfaceTintColor: isAmoled ? Colors.transparent : scheme.surfaceTint,
-        centerTitle: true,
-        titleTextStyle: TextStyle(
-          color: scheme.onSurface,
-          fontSize: 22,
-          fontWeight: FontWeight.w500,
-        ),
-      );
+  static AppBarTheme _appBarTheme(
+    ColorScheme scheme, {
+    bool isAmoled = false,
+  }) => AppBarTheme(
+    elevation: 0,
+    scrolledUnderElevation: isAmoled ? 0 : 3,
+    backgroundColor: isAmoled ? Colors.black : scheme.surface,
+    foregroundColor: scheme.onSurface,
+    surfaceTintColor: isAmoled ? Colors.transparent : scheme.surfaceTint,
+    centerTitle: true,
+    titleTextStyle: TextStyle(
+      color: scheme.onSurface,
+      fontSize: 22,
+      fontWeight: FontWeight.w500,
+    ),
+  );

  /// Card theme
  static CardThemeData _cardTheme(ColorScheme scheme) => CardThemeData(
-        elevation: 0,
-        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
-        color: scheme.surfaceContainerLow,
-        surfaceTintColor: scheme.surfaceTint,
-      );
+    elevation: 0,
+    shape: RoundedRectangleBorder(
+      borderRadius: BorderRadius.circular(16),
+    ), // 12 -> 16
+    color: scheme.surfaceContainerLow,
+    surfaceTintColor: scheme.surfaceTint,
+  );

  /// Elevated button theme
  static ElevatedButtonThemeData _elevatedButtonTheme(ColorScheme scheme) =>
      ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          elevation: 1,
-          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(16),
+          ), // 20 -> 16
          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
        ),
      );
@@ -111,7 +117,9 @@ class AppTheme {
  static FilledButtonThemeData _filledButtonTheme(ColorScheme scheme) =>
      FilledButtonThemeData(
        style: FilledButton.styleFrom(
-          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(16),
+          ), // 20 -> 16
          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
        ),
      );
@@ -120,7 +128,9 @@ class AppTheme {
  static OutlinedButtonThemeData _outlinedButtonTheme(ColorScheme scheme) =>
      OutlinedButtonThemeData(
        style: OutlinedButton.styleFrom(
-          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(16),
+          ), // 20 -> 16
          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
        ),
      );
@@ -129,7 +139,9 @@ class AppTheme {
  static TextButtonThemeData _textButtonTheme(ColorScheme scheme) =>
      TextButtonThemeData(
        style: TextButton.styleFrom(
-          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(16),
+          ), // 20 -> 16
          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
        ),
      );
@@ -147,52 +159,63 @@ class AppTheme {
  static InputDecorationTheme _inputDecorationTheme(ColorScheme scheme) =>
      InputDecorationTheme(
        filled: true,
-        fillColor: scheme.surfaceContainerHighest,
+        fillColor: scheme.surfaceContainerHighest.withValues(
+          alpha: 0.3,
+        ), // Added transparency
        border: OutlineInputBorder(
-          borderRadius: BorderRadius.circular(12),
+          borderRadius: BorderRadius.circular(16), // 12 -> 16
          borderSide: BorderSide.none,
        ),
        enabledBorder: OutlineInputBorder(
-          borderRadius: BorderRadius.circular(12),
+          borderRadius: BorderRadius.circular(16), // 12 -> 16
          borderSide: BorderSide.none,
        ),
        focusedBorder: OutlineInputBorder(
-          borderRadius: BorderRadius.circular(12),
+          borderRadius: BorderRadius.circular(16), // 12 -> 16
          borderSide: BorderSide(color: scheme.primary, width: 2),
        ),
        errorBorder: OutlineInputBorder(
-          borderRadius: BorderRadius.circular(12),
+          borderRadius: BorderRadius.circular(16), // 12 -> 16
          borderSide: BorderSide(color: scheme.error, width: 1),
        ),
-        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
+        contentPadding: const EdgeInsets.symmetric(
+          horizontal: 20,
+          vertical: 16,
+        ), // consistent padding
      );

  /// List tile theme
-  static ListTileThemeData _listTileTheme(ColorScheme scheme) => ListTileThemeData(
-        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+  static ListTileThemeData _listTileTheme(ColorScheme scheme) =>
+      ListTileThemeData(
+        shape: RoundedRectangleBorder(
+          borderRadius: BorderRadius.circular(16),
+        ), // 12 -> 16
        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
      );

  /// Dialog theme
  static DialogThemeData _dialogTheme(ColorScheme scheme) => DialogThemeData(
-        elevation: 6,
-        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(28)),
-        backgroundColor: scheme.surfaceContainerHigh,
-        surfaceTintColor: scheme.surfaceTint,
-      );
+    elevation: 6,
+    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(28)),
+    backgroundColor: scheme.surfaceContainerHigh,
+    surfaceTintColor: scheme.surfaceTint,
+  );

  /// Navigation bar theme
-  static NavigationBarThemeData _navigationBarTheme(ColorScheme scheme, {bool isAmoled = false}) =>
-      NavigationBarThemeData(
-        elevation: 0,
-        backgroundColor: isAmoled ? Colors.black : scheme.surfaceContainer,
-        indicatorColor: scheme.secondaryContainer,
-        surfaceTintColor: isAmoled ? Colors.transparent : scheme.surfaceTint,
-        labelBehavior: NavigationDestinationLabelBehavior.alwaysShow,
-      );
+  static NavigationBarThemeData _navigationBarTheme(
+    ColorScheme scheme, {
+    bool isAmoled = false,
+  }) => NavigationBarThemeData(
+    elevation: 0,
+    backgroundColor: isAmoled ? Colors.black : scheme.surfaceContainer,
+    indicatorColor: scheme.secondaryContainer,
+    surfaceTintColor: isAmoled ? Colors.transparent : scheme.surfaceTint,
+    labelBehavior: NavigationDestinationLabelBehavior.alwaysShow,
+  );

  /// SnackBar theme
-  static SnackBarThemeData _snackBarTheme(ColorScheme scheme) => SnackBarThemeData(
+  static SnackBarThemeData _snackBarTheme(ColorScheme scheme) =>
+      SnackBarThemeData(
        behavior: SnackBarBehavior.floating,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
        backgroundColor: scheme.inverseSurface,
@@ -200,40 +223,44 @@ class AppTheme {
      );

  /// Progress indicator theme
-  static ProgressIndicatorThemeData _progressIndicatorTheme(ColorScheme scheme) =>
-      ProgressIndicatorThemeData(
-        color: scheme.primary,
-        linearTrackColor: scheme.surfaceContainerHighest,
-        circularTrackColor: scheme.surfaceContainerHighest,
-      );
+  static ProgressIndicatorThemeData _progressIndicatorTheme(
+    ColorScheme scheme,
+  ) => ProgressIndicatorThemeData(
+    color: scheme.primary,
+    linearTrackColor: scheme.surfaceContainerHighest,
+    circularTrackColor: scheme.surfaceContainerHighest,
+  );

  /// Switch theme
  static SwitchThemeData _switchTheme(ColorScheme scheme) => SwitchThemeData(
-        thumbColor: WidgetStateProperty.resolveWith((states) {
-          if (states.contains(WidgetState.selected)) {
-            return scheme.onPrimary;
-          }
-          return scheme.outline;
-        }),
-        trackColor: WidgetStateProperty.resolveWith((states) {
-          if (states.contains(WidgetState.selected)) {
-            return scheme.primary;
-          }
-          return scheme.surfaceContainerHighest;
-        }),
-      );
+    thumbColor: WidgetStateProperty.resolveWith((states) {
+      if (states.contains(WidgetState.selected)) {
+        return scheme.onPrimary;
+      }
+      return scheme.outline;
+    }),
+    trackColor: WidgetStateProperty.resolveWith((states) {
+      if (states.contains(WidgetState.selected)) {
+        return scheme.primary;
+      }
+      return scheme.surfaceContainerHighest;
+    }),
+    thumbIcon: WidgetStateProperty.resolveWith((states) {
+      if (states.contains(WidgetState.selected)) {
+        return Icon(Icons.check, color: scheme.primary);
+      }
+      return null;
+    }),
+  );

  /// Chip theme
  static ChipThemeData _chipTheme(ColorScheme scheme) => ChipThemeData(
-        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
-        backgroundColor: scheme.surfaceContainerLow,
-        selectedColor: scheme.secondaryContainer,
-      );
+    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
+    backgroundColor: scheme.surfaceContainerLow,
+    selectedColor: scheme.secondaryContainer,
+  );

  /// Divider theme
-  static DividerThemeData _dividerTheme(ColorScheme scheme) => DividerThemeData(
-        color: scheme.outlineVariant,
-        thickness: 1,
-        space: 1,
-      );
+  static DividerThemeData _dividerTheme(ColorScheme scheme) =>
+      DividerThemeData(color: scheme.outlineVariant, thickness: 1, space: 1);
 }
@@ -1,7 +1,234 @@
+import 'dart:async';
+import 'dart:collection';
+import 'package:flutter/foundation.dart';
 import 'package:logger/logger.dart';
+import 'package:spotiflac_android/services/platform_bridge.dart';
+
+/// Log entry with timestamp and level
+class LogEntry {
+  final DateTime timestamp;
+  final String level;
+  final String tag;
+  final String message;
+  final String? error;
+  final bool isFromGo; // Track if this log came from Go backend
+
+  LogEntry({
+    required this.timestamp,
+    required this.level,
+    required this.tag,
+    required this.message,
+    this.error,
+    this.isFromGo = false,
+  });
+
+  String get formattedTime {
+    final h = timestamp.hour.toString().padLeft(2, '0');
+    final m = timestamp.minute.toString().padLeft(2, '0');
+    final s = timestamp.second.toString().padLeft(2, '0');
+    final ms = timestamp.millisecond.toString().padLeft(3, '0');
+    return '$h:$m:$s.$ms';
+  }
+
+  @override
+  String toString() {
+    final errorPart = error != null ? ' | $error' : '';
+    final goPart = isFromGo ? ' [Go]' : '';
+    return '[$formattedTime] [$level]$goPart [$tag] $message$errorPart';
+  }
+}
+
+/// Circular buffer for storing logs in memory
+class LogBuffer extends ChangeNotifier {
+  static final LogBuffer _instance = LogBuffer._internal();
+  factory LogBuffer() => _instance;
+  LogBuffer._internal();
+
+  static const int maxEntries = 500;
+  final Queue<LogEntry> _entries = Queue<LogEntry>();
+  Timer? _goLogTimer;
+  int _lastGoLogIndex = 0;
+  
+  /// Whether logging is enabled (controlled by settings)
+  /// User must enable "Detailed Logging" in settings to capture logs
+  static bool _loggingEnabled = false;
+  static bool get loggingEnabled => _loggingEnabled;
+  static set loggingEnabled(bool value) {
+    _loggingEnabled = value;
+    // Also notify Go backend about logging state
+    if (value) {
+      PlatformBridge.setGoLoggingEnabled(true).catchError((_) {});
+    } else {
+      PlatformBridge.setGoLoggingEnabled(false).catchError((_) {});
+    }
+  }
+
+  List<LogEntry> get entries => _entries.toList();
+  int get length => _entries.length;
+
+  void add(LogEntry entry) {
+    // Skip adding if logging is disabled (except for errors which are always logged)
+    if (!_loggingEnabled && entry.level != 'ERROR' && entry.level != 'FATAL') {
+      return;
+    }
+    
+    if (_entries.length >= maxEntries) {
+      _entries.removeFirst();
+    }
+    _entries.add(entry);
+    notifyListeners();
+  }
+
+  /// Start polling Go backend logs
+  void startGoLogPolling() {
+    _goLogTimer?.cancel();
+    _goLogTimer = Timer.periodic(const Duration(milliseconds: 500), (_) async {
+      await _fetchGoLogs();
+    });
+  }
+
+  /// Stop polling Go backend logs
+  void stopGoLogPolling() {
+    _goLogTimer?.cancel();
+    _goLogTimer = null;
+  }
+
+  /// Fetch logs from Go backend since last index
+  Future<void> _fetchGoLogs() async {
+    try {
+      final result = await PlatformBridge.getGoLogsSince(_lastGoLogIndex);
+      final logs = result['logs'] as List<dynamic>? ?? [];
+      final nextIndex = result['next_index'] as int? ?? _lastGoLogIndex;
+      
+      for (final log in logs) {
+        final timestamp = log['timestamp'] as String? ?? '';
+        final level = log['level'] as String? ?? 'INFO';
+        final tag = log['tag'] as String? ?? 'Go';
+        final message = log['message'] as String? ?? '';
+        
+        // Parse timestamp (format: "15:04:05.000")
+        DateTime parsedTime = DateTime.now();
+        if (timestamp.isNotEmpty) {
+          try {
+            final parts = timestamp.split(':');
+            if (parts.length >= 3) {
+              final secParts = parts[2].split('.');
+              parsedTime = DateTime(
+                parsedTime.year, parsedTime.month, parsedTime.day,
+                int.parse(parts[0]), int.parse(parts[1]),
+                int.parse(secParts[0]),
+                secParts.length > 1 ? int.parse(secParts[1]) : 0,
+              );
+            }
+          } catch (_) {
+            // Use current time if parsing fails
+          }
+        }
+        
+        add(LogEntry(
+          timestamp: parsedTime,
+          level: level,
+          tag: tag,
+          message: message,
+          isFromGo: true,
+        ));
+      }
+      
+      _lastGoLogIndex = nextIndex;
+    } catch (e) {
+      // Ignore errors - Go backend might not be ready
+      if (kDebugMode) {
+        debugPrint('Failed to fetch Go logs: $e');
+      }
+    }
+  }
+
+  void clear() {
+    _entries.clear();
+    _lastGoLogIndex = 0;
+    // Also clear Go backend logs
+    PlatformBridge.clearGoLogs().catchError((_) {});
+    notifyListeners();
+  }
+
+  String export() {
+    final buffer = StringBuffer();
+    buffer.writeln('SpotiFLAC Log Export');
+    buffer.writeln('Generated: ${DateTime.now().toIso8601String()}');
+    buffer.writeln('Entries: ${_entries.length}');
+    buffer.writeln('=' * 60);
+    buffer.writeln();
+    for (final entry in _entries) {
+      buffer.writeln(entry.toString());
+    }
+    return buffer.toString();
+  }
+
+  List<LogEntry> filter({String? level, String? tag, String? search}) {
+    return _entries.where((entry) {
+      if (level != null && level != 'ALL' && entry.level != level) {
+        return false;
+      }
+      if (tag != null && !entry.tag.toLowerCase().contains(tag.toLowerCase())) {
+        return false;
+      }
+      if (search != null && search.isNotEmpty) {
+        final searchLower = search.toLowerCase();
+        return entry.message.toLowerCase().contains(searchLower) ||
+            entry.tag.toLowerCase().contains(searchLower) ||
+            (entry.error?.toLowerCase().contains(searchLower) ?? false);
+      }
+      return true;
+    }).toList();
+  }
+}
+
+/// Custom log output that writes to both console and buffer
+class BufferedOutput extends LogOutput {
+  final String tag;
+
+  BufferedOutput(this.tag);
+
+  @override
+  void output(OutputEvent event) {
+    // Print to console in debug mode
+    if (kDebugMode) {
+      for (final line in event.lines) {
+        debugPrint(line);
+      }
+    }
+
+    // Add to buffer
+    final level = _levelToString(event.level);
+    final message = event.lines.join('\n');
+    
+    LogBuffer().add(LogEntry(
+      timestamp: DateTime.now(),
+      level: level,
+      tag: tag,
+      message: message,
+    ));
+  }
+
+  String _levelToString(Level level) {
+    switch (level) {
+      case Level.debug:
+        return 'DEBUG';
+      case Level.info:
+        return 'INFO';
+      case Level.warning:
+        return 'WARN';
+      case Level.error:
+        return 'ERROR';
+      case Level.fatal:
+        return 'FATAL';
+      default:
+        return 'LOG';
+    }
+  }
+}

 /// Global logger instance for the app
-/// Uses pretty printer in debug mode for readable output
 final log = Logger(
  printer: PrettyPrinter(
    methodCount: 0,
@@ -15,14 +242,76 @@ final log = Logger(
 );

 /// Logger with class/tag prefix for better traceability
+/// Now also writes to LogBuffer for in-app viewing
+/// Works in both debug and release mode
 class AppLogger {
  final String _tag;
-  
-  AppLogger(this._tag);
-  
-  void d(String message) => log.d('[$_tag] $message');
-  void i(String message) => log.i('[$_tag] $message');
-  void w(String message) => log.w('[$_tag] $message');
-  void e(String message, [Object? error, StackTrace? stackTrace]) => 
-      log.e('[$_tag] $message', error: error, stackTrace: stackTrace);
+  late final Logger? _logger;
+
+  AppLogger(this._tag) {
+    // Only create Logger instance in debug mode
+    // In release mode, we write directly to LogBuffer
+    if (kDebugMode) {
+      _logger = Logger(
+        printer: SimplePrinter(printTime: false, colors: false),
+        output: BufferedOutput(_tag),
+        level: Level.debug,
+      );
+    } else {
+      _logger = null;
+    }
+  }
+
+  void _addToBuffer(String level, String message, {String? error}) {
+    LogBuffer().add(LogEntry(
+      timestamp: DateTime.now(),
+      level: level,
+      tag: _tag,
+      message: message,
+      error: error,
+    ));
+  }
+
+  void d(String message) {
+    if (kDebugMode) {
+      _logger?.d(message);
+    } else {
+      // In release mode, write directly to buffer
+      _addToBuffer('DEBUG', message);
+    }
+  }
+
+  void i(String message) {
+    if (kDebugMode) {
+      _logger?.i(message);
+    } else {
+      _addToBuffer('INFO', message);
+    }
+  }
+
+  void w(String message) {
+    if (kDebugMode) {
+      _logger?.w(message);
+    } else {
+      _addToBuffer('WARN', message);
+    }
+  }
+
+  void e(String message, [Object? error, StackTrace? stackTrace]) {
+    if (error != null) {
+      _addToBuffer('ERROR', message, error: error.toString());
+      if (kDebugMode) {
+        debugPrint('[$_tag] ERROR: $message | $error');
+        if (stackTrace != null) {
+          debugPrint(stackTrace.toString());
+        }
+      }
+    } else {
+      if (kDebugMode) {
+        _logger?.e(message);
+      } else {
+        _addToBuffer('ERROR', message);
+      }
+    }
+  }
 }
@@ -0,0 +1,483 @@
+import 'dart:io';
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
+
+/// Built-in service info with quality options
+class BuiltInService {
+  final String id;
+  final String label;
+  final List<QualityOption> qualityOptions;
+
+  const BuiltInService({
+    required this.id,
+    required this.label,
+    required this.qualityOptions,
+  });
+}
+
+/// Default quality options for built-in services (Tidal, Qobuz, Amazon)
+const _builtInServices = [
+  BuiltInService(
+    id: 'tidal',
+    label: 'Tidal',
+    qualityOptions: [
+      QualityOption(id: 'LOSSLESS', label: 'FLAC Lossless', description: '16-bit / 44.1kHz'),
+      QualityOption(id: 'HI_RES', label: 'Hi-Res FLAC', description: '24-bit / up to 96kHz'),
+      QualityOption(id: 'HI_RES_LOSSLESS', label: 'Hi-Res FLAC Max', description: '24-bit / up to 192kHz'),
+    ],
+  ),
+  BuiltInService(
+    id: 'qobuz',
+    label: 'Qobuz',
+    qualityOptions: [
+      QualityOption(id: 'LOSSLESS', label: 'FLAC Lossless', description: '16-bit / 44.1kHz'),
+      QualityOption(id: 'HI_RES', label: 'Hi-Res FLAC', description: '24-bit / up to 96kHz'),
+      QualityOption(id: 'HI_RES_LOSSLESS', label: 'Hi-Res FLAC Max', description: '24-bit / up to 192kHz'),
+    ],
+  ),
+  BuiltInService(
+    id: 'amazon',
+    label: 'Amazon',
+    qualityOptions: [
+      QualityOption(id: 'LOSSLESS', label: 'FLAC Lossless', description: '16-bit / 44.1kHz'),
+      QualityOption(id: 'HI_RES', label: 'Hi-Res FLAC', description: '24-bit / up to 96kHz'),
+      QualityOption(id: 'HI_RES_LOSSLESS', label: 'Hi-Res FLAC Max', description: '24-bit / up to 192kHz'),
+    ],
+  ),
+];
+
+/// A reusable widget for selecting download service (built-in + extensions)
+class DownloadServicePicker extends ConsumerStatefulWidget {
+  final String? trackName;
+  final String? artistName;
+  final String? coverUrl;
+  final void Function(String quality, String service) onSelect;
+
+  const DownloadServicePicker({
+    super.key,
+    this.trackName,
+    this.artistName,
+    this.coverUrl,
+    required this.onSelect,
+  });
+
+  @override
+  ConsumerState<DownloadServicePicker> createState() => _DownloadServicePickerState();
+
+  /// Show the download service picker as a modal bottom sheet
+  static void show(
+    BuildContext context, {
+    String? trackName,
+    String? artistName,
+    String? coverUrl,
+    required void Function(String quality, String service) onSelect,
+  }) {
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    showModalBottomSheet(
+      context: context,
+      backgroundColor: colorScheme.surfaceContainerHigh,
+      shape: const RoundedRectangleBorder(
+        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
+      ),
+      isScrollControlled: true,
+      builder: (context) => DownloadServicePicker(
+        trackName: trackName,
+        artistName: artistName,
+        coverUrl: coverUrl,
+        onSelect: onSelect,
+      ),
+    );
+  }
+}
+
+class _DownloadServicePickerState extends ConsumerState<DownloadServicePicker> {
+  late String _selectedService;
+
+  @override
+  void initState() {
+    super.initState();
+    _selectedService = ref.read(settingsProvider).defaultService;
+  }
+
+  /// Get quality options for the selected service
+  List<QualityOption> _getQualityOptions() {
+    // Check if it's a built-in service
+    final builtIn = _builtInServices.where((s) => s.id == _selectedService).firstOrNull;
+    if (builtIn != null) {
+      return builtIn.qualityOptions;
+    }
+
+    // Check if it's an extension
+    final extensionState = ref.read(extensionProvider);
+    final ext = extensionState.extensions.where((e) => e.id == _selectedService).firstOrNull;
+    if (ext != null && ext.qualityOptions.isNotEmpty) {
+      return ext.qualityOptions;
+    }
+
+    // Default quality options if extension doesn't specify any
+    return const [
+      QualityOption(id: 'DEFAULT', label: 'Default Quality', description: 'Best available'),
+    ];
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final extensionState = ref.watch(extensionProvider);
+    
+    // Get enabled download provider extensions
+    final downloadExtensions = extensionState.extensions
+        .where((ext) => ext.enabled && ext.hasDownloadProvider)
+        .toList();
+
+    final qualityOptions = _getQualityOptions();
+
+    return SafeArea(
+      child: SingleChildScrollView(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            // Track info header (if provided)
+            if (widget.trackName != null) ...[
+              _TrackInfoHeader(
+                trackName: widget.trackName!,
+                artistName: widget.artistName,
+                coverUrl: widget.coverUrl,
+              ),
+              Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+            ] else ...[
+              const SizedBox(height: 8),
+              Center(
+                child: Container(
+                  width: 40,
+                  height: 4,
+                  decoration: BoxDecoration(
+                    color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4),
+                    borderRadius: BorderRadius.circular(2),
+                  ),
+                ),
+              ),
+            ],
+
+            // Service selector section
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
+              child: Text(
+                'Download From',
+                style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
+              ),
+            ),
+
+            // Built-in services
+            Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 20),
+              child: Wrap(
+                spacing: 8,
+                runSpacing: 8,
+                children: [
+                  // Built-in services
+                  for (final service in _builtInServices)
+                    _ServiceChip(
+                      label: service.label,
+                      isSelected: _selectedService == service.id,
+                      onTap: () => setState(() => _selectedService = service.id),
+                    ),
+                  // Extension services
+                  for (final ext in downloadExtensions)
+                    _ServiceChip(
+                      label: ext.displayName,
+                      isSelected: _selectedService == ext.id,
+                      onTap: () => setState(() => _selectedService = ext.id),
+                      iconPath: ext.iconPath,
+                    ),
+                ],
+              ),
+            ),
+
+            // Quality selector section
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
+              child: Text(
+                'Select Quality',
+                style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
+              ),
+            ),
+
+            // Disclaimer for built-in services
+            if (_builtInServices.any((s) => s.id == _selectedService))
+              Padding(
+                padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
+                child: Text(
+                  'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
+                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                    color: colorScheme.onSurfaceVariant,
+                    fontStyle: FontStyle.italic,
+                  ),
+                ),
+              ),
+
+            // Quality options
+            for (final quality in qualityOptions)
+              _QualityOption(
+                title: quality.label,
+                subtitle: quality.description ?? '',
+                icon: _getQualityIcon(quality.id),
+                onTap: () {
+                  Navigator.pop(context);
+                  widget.onSelect(quality.id, _selectedService);
+                },
+              ),
+
+            const SizedBox(height: 16),
+          ],
+        ),
+      ),
+    );
+  }
+
+  IconData _getQualityIcon(String qualityId) {
+    switch (qualityId.toUpperCase()) {
+      case 'HI_RES_LOSSLESS':
+        return Icons.four_k;
+      case 'HI_RES':
+        return Icons.high_quality;
+      case 'LOSSLESS':
+        return Icons.music_note;
+      case 'MP3_320':
+      case 'MP3':
+        return Icons.audiotrack;
+      case 'OPUS':
+      case 'OPUS_128':
+        return Icons.graphic_eq;
+      default:
+        return Icons.music_note;
+    }
+  }
+}
+
+
+class _QualityOption extends StatelessWidget {
+  final String title;
+  final String subtitle;
+  final IconData icon;
+  final VoidCallback onTap;
+
+  const _QualityOption({
+    required this.title,
+    required this.subtitle,
+    required this.icon,
+    required this.onTap,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return ListTile(
+      contentPadding: const EdgeInsets.symmetric(horizontal: 24, vertical: 4),
+      leading: Container(
+        padding: const EdgeInsets.all(10),
+        decoration: BoxDecoration(
+          color: colorScheme.primaryContainer,
+          borderRadius: BorderRadius.circular(12),
+        ),
+        child: Icon(icon, color: colorScheme.onPrimaryContainer, size: 20),
+      ),
+      title: Text(title, style: const TextStyle(fontWeight: FontWeight.w500)),
+      subtitle: subtitle.isNotEmpty
+          ? Text(subtitle, style: TextStyle(color: colorScheme.onSurfaceVariant))
+          : null,
+      onTap: onTap,
+    );
+  }
+}
+
+class _ServiceChip extends StatelessWidget {
+  final String label;
+  final bool isSelected;
+  final VoidCallback onTap;
+  final String? iconPath;
+
+  const _ServiceChip({
+    required this.label,
+    required this.isSelected,
+    required this.onTap,
+    this.iconPath,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return GestureDetector(
+      onTap: onTap,
+      child: AnimatedContainer(
+        duration: const Duration(milliseconds: 200),
+        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
+        decoration: BoxDecoration(
+          color: isSelected ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
+          borderRadius: BorderRadius.circular(12),
+          border: isSelected ? null : Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+        ),
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            if (iconPath != null) ...[
+              ClipRRect(
+                borderRadius: BorderRadius.circular(4),
+                child: Image.file(
+                  File(iconPath!),
+                  width: 18,
+                  height: 18,
+                  fit: BoxFit.cover,
+                  errorBuilder: (context, error, stackTrace) => Icon(
+                    Icons.extension,
+                    size: 18,
+                    color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
+                  ),
+                ),
+              ),
+              const SizedBox(width: 6),
+            ],
+            Text(
+              label,
+              style: TextStyle(
+                fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
+                color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _TrackInfoHeader extends StatefulWidget {
+  final String trackName;
+  final String? artistName;
+  final String? coverUrl;
+
+  const _TrackInfoHeader({
+    required this.trackName,
+    this.artistName,
+    this.coverUrl,
+  });
+
+  @override
+  State<_TrackInfoHeader> createState() => _TrackInfoHeaderState();
+}
+
+class _TrackInfoHeaderState extends State<_TrackInfoHeader> {
+  bool _expanded = false;
+  bool _isOverflowing = false;
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return Material(
+      color: Colors.transparent,
+      child: InkWell(
+        onTap: _isOverflowing ? () => setState(() => _expanded = !_expanded) : null,
+        borderRadius: const BorderRadius.only(
+          topLeft: Radius.circular(28),
+          topRight: Radius.circular(28),
+        ),
+        child: Column(
+          children: [
+            const SizedBox(height: 8),
+            Container(
+              width: 40,
+              height: 4,
+              decoration: BoxDecoration(
+                color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4),
+                borderRadius: BorderRadius.circular(2),
+              ),
+            ),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
+              child: Row(
+                children: [
+                  ClipRRect(
+                    borderRadius: BorderRadius.circular(8),
+                    child: widget.coverUrl != null
+                        ? Image.network(
+                            widget.coverUrl!,
+                            width: 56,
+                            height: 56,
+                            fit: BoxFit.cover,
+                            errorBuilder: (context, error, stackTrace) => Container(
+                              width: 56,
+                              height: 56,
+                              color: colorScheme.surfaceContainerHighest,
+                              child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant),
+                            ),
+                          )
+                        : Container(
+                            width: 56,
+                            height: 56,
+                            color: colorScheme.surfaceContainerHighest,
+                            child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant),
+                          ),
+                  ),
+                  const SizedBox(width: 12),
+                  Expanded(
+                    child: LayoutBuilder(
+                      builder: (context, constraints) {
+                        final titleStyle = Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600);
+                        final titleSpan = TextSpan(text: widget.trackName, style: titleStyle);
+                        final titlePainter = TextPainter(
+                          text: titleSpan,
+                          maxLines: 1,
+                          textDirection: TextDirection.ltr,
+                        )..layout(maxWidth: constraints.maxWidth);
+                        final titleOverflows = titlePainter.didExceedMaxLines;
+
+                        WidgetsBinding.instance.addPostFrameCallback((_) {
+                          if (mounted && _isOverflowing != titleOverflows) {
+                            setState(() => _isOverflowing = titleOverflows);
+                          }
+                        });
+
+                        return Column(
+                          crossAxisAlignment: CrossAxisAlignment.start,
+                          children: [
+                            Text(
+                              widget.trackName,
+                              style: titleStyle,
+                              maxLines: _expanded ? 10 : 1,
+                              overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
+                            ),
+                            if (widget.artistName != null) ...[
+                              const SizedBox(height: 2),
+                              Text(
+                                widget.artistName!,
+                                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                                  color: colorScheme.onSurfaceVariant,
+                                ),
+                                maxLines: _expanded ? 3 : 1,
+                                overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
+                              ),
+                            ],
+                          ],
+                        );
+                      },
+                    ),
+                  ),
+                  if (_isOverflowing || _expanded)
+                    Icon(
+                      _expanded ? Icons.expand_less : Icons.expand_more,
+                      color: colorScheme.onSurfaceVariant,
+                      size: 20,
+                    ),
+                ],
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
@@ -72,7 +72,7 @@ class SettingsItem extends StatelessWidget {
        InkWell(
          onTap: onTap,
          splashColor: colorScheme.primary.withValues(alpha: 0.12),
-          highlightColor: colorScheme.primary.withValues(alpha: 0.08),
+          highlightColor: Colors.transparent,
          child: Padding(
            padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 16),
            child: Row(
@@ -133,6 +133,7 @@ class SettingsSwitchItem extends StatelessWidget {
  final bool value;
  final ValueChanged<bool>? onChanged;
  final bool showDivider;
+  final bool enabled;

  const SettingsSwitchItem({
    super.key,
@@ -142,53 +143,60 @@ class SettingsSwitchItem extends StatelessWidget {
    required this.value,
    this.onChanged,
    this.showDivider = true,
+    this.enabled = true,
  });

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
+    final isDisabled = !enabled || onChanged == null;
    
    return Column(
      mainAxisSize: MainAxisSize.min,
      children: [
-        InkWell(
-          onTap: onChanged != null ? () => onChanged!(!value) : null,
-          splashColor: colorScheme.primary.withValues(alpha: 0.12),
-          highlightColor: colorScheme.primary.withValues(alpha: 0.08),
-          child: Padding(
-            padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
-            child: Row(
-              children: [
-                if (icon != null) ...[
-                  Icon(icon, color: colorScheme.onSurfaceVariant, size: 24),
-                  const SizedBox(width: 16),
-                ],
-                Expanded(
-                  child: Column(
-                    crossAxisAlignment: CrossAxisAlignment.start,
-                    children: [
-                      Text(
-                        title,
-                        style: Theme.of(context).textTheme.bodyLarge,
-                      ),
-                      if (subtitle != null) ...[
-                        const SizedBox(height: 2),
+        Opacity(
+          opacity: isDisabled ? 0.5 : 1.0,
+          child: InkWell(
+            onTap: isDisabled ? null : () => onChanged!(!value),
+            splashColor: colorScheme.primary.withValues(alpha: 0.12),
+            highlightColor: Colors.transparent,
+            child: Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
+              child: Row(
+                children: [
+                  if (icon != null) ...[
+                    Icon(icon, color: isDisabled ? colorScheme.outline : colorScheme.onSurfaceVariant, size: 24),
+                    const SizedBox(width: 16),
+                  ],
+                  Expanded(
+                    child: Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: [
                        Text(
-                          subtitle!,
-                          style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                            color: colorScheme.onSurfaceVariant,
+                          title,
+                          style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                            color: isDisabled ? colorScheme.outline : null,
                          ),
                        ),
+                        if (subtitle != null) ...[
+                          const SizedBox(height: 2),
+                          Text(
+                            subtitle!,
+                            style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                              color: isDisabled ? colorScheme.outline : colorScheme.onSurfaceVariant,
+                            ),
+                          ),
+                        ],
                      ],
-                    ],
+                    ),
                  ),
-                ),
-                const SizedBox(width: 8),
-                Switch(
-                  value: value,
-                  onChanged: onChanged,
-                ),
-              ],
+                  const SizedBox(width: 8),
+                  Switch(
+                    value: value,
+                    onChanged: isDisabled ? null : onChanged,
+                  ),
+                ],
+              ),
            ),
          ),
        ),
@@ -1,7 +1,7 @@
 name: spotiflac_android
 description: Download Spotify tracks in FLAC from Tidal, Qobuz & Amazon Music
 publish_to: "none"
-version: 2.2.0+46
+version: 3.0.0+57

 environment:
  sdk: ^3.10.0
@@ -1,7 +1,7 @@
 name: spotiflac_android
 description: Download Spotify tracks in FLAC from Tidal, Qobuz & Amazon Music
 publish_to: "none"
-version: 2.2.0+46
+version: 3.0.0+57

 environment:
  sdk: ^3.10.0
Author	SHA1	Message	Date
zarzet	18bc079632	Merge dev into main: v3.0.0 stable release	2026-01-14 18:08:30 +07:00
zarzet	4091a9c499	release: v3.0.0 stable with Extension System	2026-01-14 01:57:30 +07:00
zarzet	9346f2d149	fix: bottom overflow in Folder Organization dialog	2026-01-14 01:00:52 +07:00
zarzet	8ab52959e8	refactor: simplify parallel download result handling in tidal/qobuz	2026-01-14 00:57:04 +07:00
zarzet	bad95e99c8	fix: remove unused getDownloadURLSequential from tidal.go Replaced by parallel version for faster API responses	2026-01-14 00:39:59 +07:00
zarzet	dbd7fd70be	fix: remove unused function and fix bit shifting warnings - Remove unused getQobuzDownloadURLSequential (replaced by parallel version) - Fix bit shifting on byte values in metadata.go (cast to uint32 before shift)	2026-01-14 00:38:46 +07:00
zarzet	125d070cfe	fix: remove duplicate --- separator in release notes Extract changelog now strips trailing --- from CHANGELOG.md sections	2026-01-13 23:51:59 +07:00
zarzet	15acf181d1	fix: back gesture freeze on Android 13+ and add album folder structure setting - Add PopScope with canPop:true to all settings pages for predictive back gesture support - Change settings navigation to use PageRouteBuilder instead of MaterialPageRoute - Add album folder structure setting (artist_album vs album_only) - Fix extension search result parsing to handle both array and object formats - Update CHANGELOG Fixes back gesture freeze issue on OnePlus and other Android 13+ devices with gesture navigation	2026-01-13 23:48:02 +07:00
zarzet	e049f9b868	fix: improve artist matching for multi-artist tracks and add cover logging	2026-01-13 20:55:46 +07:00
zarzet	6a886c5276	fix: handle Japanese artist name order in Tidal/Qobuz matching	2026-01-13 20:31:05 +07:00
zarzet	1ec190bfe7	fix: multiple bugfixes for v3.0.0-beta.2	2026-01-13 20:12:35 +07:00
zarzet	7ca032b3f5	fix: remove unnecessary PopScope to prevent back gesture freeze Removes PopScope wrapper from settings pages that don't need it. PopScope with canPop: true was causing race condition with Android gesture navigation, freezing the app.	2026-01-13 18:18:41 +07:00
zarzet	13b917d1a0	fix: preserve directory structure when extracting extension packages	2026-01-13 17:50:12 +07:00
zarzet	961072e2ac	security: use per-installation random salt for credential encryption	2026-01-13 17:44:14 +07:00
zarzet	8a7815268b	security: improve extension sandbox security - Add file permission requirement for extensions - Bump version to 3.0.0-beta.1	2026-01-13 17:41:24 +07:00
zarzet	c7e1ffd926	chore: bump version to 3.0.0-alpha.4	2026-01-13 06:01:12 +07:00
zarzet	729ab01a5f	feat(extension): add HMAC-SHA1 utility, artist URL handler, and store refresh fix - Add utils.hmacSHA1(key, message) for extensions - Add artist type handling in track_provider for extension URL results - Fix extension store not refreshing after uninstall - Update CHANGELOG with new features and Spotify Web extension	2026-01-13 05:54:19 +07:00
zarzet	0a16be4395	feat(extension): add HMAC-SHA1 utility, artist URL handler, and store refresh fix - Add utils.hmacSHA1(key, message) for cryptographic operations in extensions - Add artist type handling in track_provider for extension URL results - Fix extension store not refreshing after uninstall - Update CHANGELOG with new features and Spotify Web extension docs	2026-01-13 05:53:30 +07:00
zarzet	47cdb5564a	fix(store): refresh store after extension uninstall to update isInstalled status	2026-01-13 04:30:25 +07:00
zarzet	f7d5a24d17	refactor(extension): split extension_runtime.go into multiple files + add HMAC-SHA256	2026-01-13 04:17:00 +07:00
zarzet	8daff4d0a4	feat: improve Extension Store with custom icons and various fixes - Support custom extension icons from registry (iconUrl field) - Support both camelCase and snake_case in registry JSON - Fix download file extension (.spotiflac-ext) - New extensions start disabled by default - Preserve enabled state on extension upgrade - Add toggle to show/hide Store tab in Settings > Options - Reorder tabs: Home, History, Store, Settings	2026-01-13 01:01:43 +07:00
zarzet	a38d66fd41	feat: add Extension Store for browsing and installing extensions	2026-01-13 00:03:39 +07:00
zarzet	0cab01780d	fix: gomobile compatibility for HandleURLWithExtension return type	2026-01-12 23:43:57 +07:00
zarzet	4afc14dee8	chore: increase log buffer size from 500 to 1000 entries	2026-01-12 23:18:47 +07:00
zarzet	00753ffe86	chore: increase log buffer size from 500 to 1000 entries	2026-01-12 23:17:30 +07:00
zarzet	523b1edc44	feat(extension): add custom URL handler support for extensions - Add URLHandlerConfig to extension manifest (Go) - Add HandleURL method to extension providers (Go) - Add export functions for URL handling (Go) - Add URLHandler class to extension_provider.dart (Flutter) - Add platform bridge methods for URL handling (Flutter) - Update fetchFromUrl to check extension URL handlers first - Add Android/iOS native handlers for extension URL routing - Update CHANGELOG with new feature	2026-01-12 22:22:25 +07:00
zarzet	4966a84614	chore: bump version to 3.0.0-alpha.3	2026-01-12 22:02:29 +07:00
zarzet	9247a775fa	feat(extension): add browser-like polyfills for easier library porting - Add fetch() API with json(), text(), arrayBuffer() methods - Add atob()/btoa() global Base64 functions - Add TextEncoder/TextDecoder classes for UTF-8 encoding - Add URL/URLSearchParams classes for URL parsing - Update documentation with polyfill usage examples - All polyfills work within sandbox security model	2026-01-12 21:18:04 +07:00
zarzet	b185b51b31	merge: sync bugfixes from main (permission error, Android 13+ storage)	2026-01-12 19:59:09 +07:00
zarzet	d98960d053	fix: permission error message and Android 13+ storage permission - Fixed download showing 'Song not found' when actually permission error - Added permission error type detection in Go backend - Android 13+ now requests both MANAGE_EXTERNAL_STORAGE and READ_MEDIA_AUDIO - MANAGE_EXTERNAL_STORAGE opens Settings (system-level) - READ_MEDIA_AUDIO shows dialog (app-level, resets on clear data) - Proper permission check before showing 'granted' status	2026-01-12 19:56:12 +07:00
zarzet	d417743654	chore: bump version to 2.2.9	2026-01-12 18:47:53 +07:00
zarzet	c4bea124fb	perf: parallel API calls for Tidal and Qobuz download URLs - Tidal: Request download URL from all 8 APIs simultaneously - Qobuz: Request download URL from all 2 APIs simultaneously - First successful response wins ('siapa cepat dia dapat') - Significantly reduces download URL fetch time - Amazon remains sequential due to rate limiting requirements This improves download speed by eliminating sequential API fallback delays.	2026-01-12 18:32:59 +07:00
zarzet	c37410b5de	feat: add Separate Singles Folder option - Add albumType field to Track model with isSingle getter - Add separateSingles setting in AppSettings - Modify _buildOutputDir() to organize into Albums/ and Singles/ folders - Add UI toggle in download settings page - Parse album_type/record_type from Spotify and Deezer APIs When enabled, singles are saved to a separate 'Singles' folder	2026-01-12 18:27:38 +07:00
zarzet	b90c94125c	merge: sync bugfix from main (duplicate history fix)	2026-01-12 18:26:06 +07:00
zarzet	efbf5d4c5b	fix: prevent duplicate entries in download history - Add duplicate detection in addToHistory() by spotifyId, deezerId, or ISRC - Replace existing entry and move to top when re-downloading same track - Add _deduplicateHistory() to clean up existing duplicates on app load - Auto-save after removing duplicates from storage Fixes duplicate history entries when downloading same track multiple times	2026-01-12 18:25:38 +07:00
zarzet	35532b0c73	feat(extension): Enhanced HTTP API for YouTube Music support - Add http.put(), http.delete(), http.patch() shortcut methods - Add persistent cookie jar per extension - Add http.clearCookies() to clear session - Fix User-Agent header respect (no longer overwritten) - Return multi-value headers as arrays (Set-Cookie support) - Auto-stringify objects in POST/PUT/PATCH body - Add response.ok and response.status properties - Update documentation with YouTube Music example	2026-01-12 06:37:18 +07:00
zarzet	4c09b988e4	Merge main into dev (sync v2.2.8 features)	2026-01-12 06:22:22 +07:00
zarzet	c673581c32	feat: multi-select batch delete and album grouping in history - Add multi-select mode with long-press to select tracks - Add bottom action bar for selection (Material 3 style) - Add filter tabs: All/Albums/Singles - Add album grouping view when Albums filter selected - Add DownloadedAlbumScreen for viewing tracks in an album - Reactive UI updates when tracks deleted - Auto-pop when album has <2 tracks - Update issue templates with (Stable Version) text - Bump version to 2.2.8	2026-01-12 06:18:32 +07:00
zarzet	bcd718b178	fix: reset settings when extension is disabled - Reset metadata source to Deezer when search provider extension is disabled - Reset default service to Tidal when download provider extension is disabled - Check extension enabled state in Options page (Primary Provider) - Check extension enabled state in Download Settings (Service selector) - Show extension download providers in service selector when enabled	2026-01-12 02:26:18 +07:00
zarzet	2b9357cb6d	feat: remove default Spotify credentials, require user's own API key - Remove hardcoded Spotify client ID/secret from Go backend - Spotify now requires user to provide their own credentials - Deezer remains free (no credentials required) - Update UI to show 'Free' badge for Deezer, 'API Key' for Spotify - Show warning card when Spotify selected without credentials - Add hasSpotifyCredentials check to platform bridge	2026-01-12 02:10:40 +07:00
zarzet	26d84041c7	fix: initialize extension system at app start for proper search hint - Move extension system initialization to main.dart _EagerInitialization - Show default search hint until extension system is initialized - Watch extension state changes to update search hint dynamically	2026-01-12 01:58:44 +07:00
zarzet	93b4047143	fix: persist extension enabled state and clear search provider when disabled - Save enabled state to settings store when extension is enabled/disabled - Restore enabled state from settings store when extension is loaded - Clear searchProvider setting when the extension is disabled - Update search hint to check if extension is still enabled	2026-01-12 01:56:16 +07:00
zarzet	a6d488696b	chore: add extension API feature request template and ignore docs folder	2026-01-12 01:22:23 +07:00
zarzet	3dbd131e49	fix: iOS extension auth function names (use ByID suffix)	2026-01-12 01:02:16 +07:00
zarzet	57cb575483	feat: add extension system with skipBuiltInFallback support - Add extension manager, manifest, runtime, providers, settings - Add extension provider and UI pages (extensions, detail, priority) - Add download service picker widget - Add metadata provider priority page - Add source field to Track model for extension tracking - Add skipBuiltInFallback manifest option to skip built-in providers - Update download queue to use source extension first - Add extension upgrade support without data loss	2026-01-12 00:17:52 +07:00
zarzet	24ef66be4c	Merge branch 'main' of https://github.com/zarzet/SpotiFLAC-Mobile	2026-01-11 06:41:54 +07:00
zarzet	d07a49f605	UI modernization: Global theme update, redesigned Options/Download settings, and smart filename editor	2026-01-11 06:41:34 +07:00
zarzet	4eba28db7a	v2.2.7: CSV import metadata enrichment with Deezer fallback	2026-01-11 06:09:48 +07:00
zarzet	b73a3f8912	Add CSV import and optimize Appearance settings	2026-01-11 05:56:30 +07:00
zarzet	9f47f2ce85	UI Modernization: Unified app bars, updated logos, improved settings & Deezer support	2026-01-11 04:28:41 +07:00
zarzet	f2aca734a3	fix: improve logging for release builds and UI improvements - Fix Flutter logs not appearing in release mode by bypassing Logger package - Add detailed logging for Deezer search API calls - Replace music_note icon with app logo on home screen - Remove shadow/border from logo in About and Home screens - Align icon size (40x40) with avatar in About page for consistent layout	2026-01-11 02:27:26 +07:00
Zarz Eleutherius	09cb637a86	Update VirusTotal link in README.md	2026-01-10 19:27:48 +07:00
zarzet	11e7034cec	v2.2.5: In-app logging, ISP blocking detection, Latin script fix	2026-01-10 19:03:39 +07:00
zarzet	f12c18d76b	Add issue templates, update workflow SDK, fix about logo	2026-01-10 16:53:41 +07:00
zarzet	0da39a1b8b	chore: update NDK to r27d LTS (27.3.13750724) for 16KB page size support	2026-01-10 16:48:52 +07:00
Zarz Eleutherius	f29fe5054c	Updated VirusTotal badge link in README Updated VirusTotal badge link to the latest report.	2026-01-10 16:09:39 +07:00
zarzet	c8c0164964	chore: update targetSdk to 36 (Android 16) with timeout handler	2026-01-10 04:51:15 +07:00
zarzet	52dd657913	fix: improve search result parsing robustness for edge cases	2026-01-10 04:48:32 +07:00
zarzet	c30f9fe412	fix(ios): add setSpotifyCredentials method to AppDelegate	2026-01-10 04:36:28 +07:00