docs: update Paxsenix integration to include all supported providers

fix: improve lyrics error detection and add new donor
- Detect error JSON payloads from Apple Music and QQMusic proxies - Add lyricsHasUsableText validation for usable lyrics content - Skip empty word lines in synced lyrics parsing - Add ClearAll method to lyrics cache - Handle TimeoutException properly in track metadata screen - Add laflame to recent donors list
2026-07-03 03:15:51 +02:00 · 2026-02-14 17:26:53 +07:00 · 2026-02-14 17:25:17 +07:00 · 2026-02-14 02:18:43 +07:00 · 2026-02-14 02:15:36 +07:00 · 2026-02-14 01:42:18 +07:00
173 changed files with 77151 additions and 15247 deletions
@@ -1,4 +1,3 @@
 github: zarzet
 ko_fi: zarzet
-buy_me_a_coffee: zarzet

@@ -15,7 +15,7 @@ jobs:
    
    steps:
      - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
        with:
          fetch-depth: 2  # Need previous commit to compare

@@ -0,0 +1,44 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'site/**'
+      - '.github/workflows/pages.yml'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: site
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4
@@ -60,23 +60,23 @@ jobs:
          df -h

      - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6

      - name: Setup Java
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
        with:
          distribution: "temurin"
          java-version: "17"

      - name: Setup Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
-          go-version: "1.25"
+          go-version: "1.26"
          cache-dependency-path: go_backend/go.sum

      # Cache Gradle for faster builds
      - name: Cache Gradle
-        uses: actions/cache@v4
+        uses: actions/cache@v5
        with:
          path: |
            ~/.gradle/caches
@@ -158,7 +158,7 @@ jobs:
          ls -la

      - name: Upload APK artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
        with:
          name: android-apk
          path: build/app/outputs/flutter-apk/SpotiFLAC-*.apk
@@ -169,17 +169,17 @@ jobs:

    steps:
      - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6

      - name: Setup Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
        with:
-          go-version: "1.25"
+          go-version: "1.26"
          cache-dependency-path: go_backend/go.sum

      # Cache CocoaPods
      - name: Cache CocoaPods
-        uses: actions/cache@v4
+        uses: actions/cache@v5
        with:
          path: ios/Pods
          key: pods-${{ runner.os }}-${{ hashFiles('ios/Podfile.lock') }}
@@ -295,7 +295,7 @@ jobs:
          fi

      - name: Upload IPA artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
        with:
          name: ios-ipa
          path: build/ios/ipa/SpotiFLAC-*.ipa
@@ -308,7 +308,7 @@ jobs:

    steps:
      - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6

      - name: Extract changelog for version
        id: changelog
@@ -338,13 +338,13 @@ jobs:
          cat /tmp/changelog.txt

      - name: Download Android APK
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
        with:
          name: android-apk
          path: ./release

      - name: Download iOS IPA
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
        with:
          name: ios-ipa
          path: ./release
@@ -385,7 +385,7 @@ jobs:
          cat /tmp/release_body.txt

      - name: Create Release
-        uses: softprops/action-gh-release@v1
+        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ needs.get-version.outputs.version }}
          name: SpotiFLAC ${{ needs.get-version.outputs.version }}
@@ -403,16 +403,16 @@ jobs:

    steps:
      - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6

      - name: Download Android APK
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
        with:
          name: android-apk
          path: ./release

      - name: Download iOS IPA
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
        with:
          name: ios-ipa
          path: ./release
@@ -1,5 +1,588 @@
 # Changelog

+## [3.6.8] - 2026-02-14
+
+### Added
+
+- **Lyrics Source Tracking**: Track Metadata screen now displays the source of loaded lyrics (LRCLIB, Musixmatch, Netease, Apple Music, QQ Music, Embedded, or Extension)
+  - New `getLyricsLRCWithSource` API returns lyrics with source metadata
+  - Source badge appears below lyrics section in Track Metadata screen
+- **Dedicated Lyrics Provider Priority Page**: Lyrics providers can now be configured from a dedicated settings page with full-screen reorderable list
+  - Replaced inline bottom sheet with `LyricsProviderPriorityPage`
+  - Cleaner UI with provider descriptions and priority ordering
+- **Paxsenix Integration**: Added Paxsenix API as official lyrics proxy partner for Apple Music, QQ Music, Musixmatch, and Netease sources
+  - Listed in About page and Partners page on project site
+  - README updated with partner attribution
+
+### Fixed
+
+- **LRC Background Vocal Preservation**: Apple Music/QQ Music `[bg:...]` background vocal tags are now preserved during LRC parsing instead of being stripped
+  - Background vocals attach to the previous timed line in exported LRC files
+- **LRC Display Improvements**:
+  - Inline word-by-word timestamps (`<mm:ss.xx>`) are stripped from lyrics display
+  - Speaker prefixes (`v1:`, `v2:`) are removed for cleaner display
+  - Multi-line background vocals converted to readable secondary vocal lines
+- **Apple Music Lyrics Case Sensitivity**: Fixed `lyricsType` comparison to use case-insensitive matching for "Syllable" type
+
+### Changed
+
+- Track Metadata lyrics fetching now uses `getLyricsLRCWithSource` for consistent source attribution across embedded and online lyrics
+
+---
+
+## [3.6.7] - 2026-02-13
+
+### Added
+
+- "Advanced Filename Templates" - new placeholders for custom track/disc formatting and date patterns
+  - `{track_raw}` and `{disc_raw}` - unpadded raw numbers
+  - `{track:N}` and `{disc:N}` - zero-padded to N digits (e.g. `{track:02}` → `01`)
+  - `{date}` - full release date from metadata
+  - `{date:%Y-%m-%d}` - date formatting with strftime patterns
+  - "Show advanced tags" toggle in Settings > Download > Filename Format to reveal these placeholders
+- Low-RAM / ARM32-only device profiling - detects constrained devices at startup and reduces image cache (120 items / 24 MiB) and disables overscroll effects for smoother performance
+- Responsive selection bar on artist screen - switches to compact stacked layout on narrow screens (< 430dp) or large text scale (> 1.15x)
+- Quality picker dialog before downloading individual tracks from artist screen (when "Ask quality before download" is enabled)
+- Project website with GitHub Pages deployment workflow
+  - Mobile burger menu navigation for all site pages
+- Go filename template test suite
+- "Lyrics Provider" extension type - extensions can now provide lyrics (synced or plain text) via `fetchLyrics()` function
+  - Lyrics provider extensions are called before built-in providers, giving extensions highest priority
+  - New `lyrics_provider` manifest type alongside `metadata_provider` and `download_provider`
+  - Shows "Lyrics Provider" capability badge on extension detail page
+- "Lyrics Providers" settings - configurable provider cascade order and per-provider options
+  - Reorderable provider list: LRCLIB, Musixmatch, Netease, Apple Music, QQ Music
+  - Netease: toggle translated/romanized lyrics appending
+  - Apple Music / QQ Music: multi-person word-by-word speaker tags
+  - Musixmatch: selectable language code for localized lyrics
+- "Documentation Search" - global search modal on all site pages
+  - Opens with Ctrl+K / Cmd+K / `/` keyboard shortcuts on every page
+  - Search button with bordered pill styling in desktop nav and mobile hamburger menu
+  - On non-docs pages, search results navigate to the docs page at the matching section
+  - Full keyboard navigation: arrow keys, Enter to select, Esc to close
+
+### Fixed
+
+- Fixed ICU plural syntax errors in DE, ES, PT, RU translations - incorrect `=1` clause was causing missing plural forms
+- Fixed featured-artist regex incorrectly splitting on `&` character (e.g. "Simon & Garfunkel" was being split) - removed `&` from separator pattern
+- Fixed `{date}` placeholder not working in filename templates - release date was not being passed to the template builder across all providers (Amazon, Qobuz, Tidal, YouTube, extensions)
+
+### Changed
+
+- Improved Go backend metadata handling - filename builder now supports fallback metadata keys and automatic type conversion for more robust template rendering
+- Extension providers now pass full metadata set to filename builder (track, disc, year, date, release_date)
+- Updated translations: added filename advanced tags strings (EN, ID), regenerated all locale dart files
+- Updated app screenshot assets
+
+---
+
+## [3.6.6] - 2026-02-12
+
+### Added
+
+- "Filter Contributing Artists in Album Artist" setting - strips featured/contributing artists from Album Artist metadata tag
+- Library scan notifications (Android and iOS) - shows progress, completion, failure, and cancellation status
+- Collapsible "Artist Name Filters" section in download settings UI
+
+### Fixed
+
+- Fixed downloads not working on iOS - missing `downloadByStrategy` and `downloadFromYouTube` method channel handlers in AppDelegate.swift
+- Fixed extended metadata (genre, label, copyright) lost during service fallback (e.g. Tidal unavailable, falls back to Qobuz) - Go backend now enriches metadata from Deezer by ISRC before download and preserves it through the fallback chain
+- Fixed local library showing incorrect "16-bit" quality label for lossy formats (MP3, Opus) - now displays actual bitrate (e.g. "MP3 320kbps")
+- Fixed inaccurate Opus/Vorbis duration calculation (e.g. 4:11 showing as 8:44) - now reads granule position from last Ogg page for precise duration
+- Fixed MP3 duration/bitrate inaccuracy for VBR files - added Xing/Info and VBRI header parsing with MPEG2/2.5 bitrate table support
+- Fixed Track Metadata screen showing scan date instead of file date for local library items
+- Fixed SAF content URI paths displayed as raw `content://` strings in Track Metadata - now shows human-readable paths
+
+### Changed
+
+- Removed legacy iOS download handlers (`downloadTrack`, `downloadWithFallback`, `downloadFromYouTube`) - iOS now uses `downloadByStrategy` only
+- Updated translations from Crowdin (all 14 languages)
+
+---
+
+## [3.6.5] - 2026-02-10
+
+### Highlights
+
+- **Audio Format Conversion**: Convert between FLAC, MP3, and Opus directly from Track Metadata screen with full metadata and cover art preservation
+- **PC v7.0.8 Backend Merge**: Adopts several Go backend improvements from SpotiFLAC PC v7.0.8 including Amazon encrypted stream support, SpotFetch metadata fallback, and Qobuz API update
+- **Amazon Music Re-enabled**: Amazon provider back in service with new API
+
+### Added
+
+- "Use Primary Artist Only" setting: strips featured artists from folder names (e.g. "Justin Bieber, Quavo" becomes "Justin Bieber") for cleaner folder organization
+  - Supports separators: `, ` `;` `&` `feat.` `ft.` `featuring` `with` `x`
+  - Available in Settings > Download > below "Use Album Artist for folders"
+- Audio format conversion from Track Metadata screen
+  - Convert between FLAC, MP3, and Opus formats (any direction)
+  - Selectable bitrate: 128k, 192k, 256k, 320k
+  - Full metadata and cover art preservation during conversion
+  - Confirmation dialog before converting (original file deleted after)
+  - SAF storage support: copies to temp, converts, writes back via SAF
+  - Download history automatically updated with new file path
+- Unified download request contract (`DownloadRequestPayload`) for all providers/flows
+  - Includes full superset fields: lyrics mode, genre/label/copyright, provider IDs, SAF params, cover/quality settings
+  - Added strategy flags in payload: `use_extensions`, `use_fallback`
+- New Go unified router entrypoint: `DownloadByStrategy(requestJSON)`
+  - Routing priority: YouTube service -> extension fallback -> built-in fallback -> direct service
+- New Android method channel handler: `"downloadByStrategy"` -> `Gobackend.downloadByStrategy(...)`
+- SpotFetch metadata fallback integration for Spotify-blocked regions
+  - New backend client for `spotify.afkarxyz.fun/api`
+  - Automatic fallback in Spotify metadata fetch path when primary source fails
+- Lyrics extraction now supports MP3 (ID3v2) and Opus/OGG (Vorbis comments) in addition to FLAC
+  - Includes heuristic detection of lyrics stored in Comment fields
+- Edit Metadata now supports manual cover selection (pick/replace cover image) and embeds it into audio tags on save
+- Save Lyrics now shows an immediate in-progress snackbar (`Saving lyrics...`) so users know the operation has started
+
+### Changed
+
+- Merged several Go backend improvements from SpotiFLAC PC v7.0.8: Amazon new API with encrypted stream/decryption support, SpotFetch metadata fallback for Spotify-blocked regions, multi-format lyrics extraction (MP3/Opus/OGG), Qobuz Jumo API update.
+- Download queue execution now builds one payload and uses a single bridge entrypoint (`PlatformBridge.downloadByStrategy`) instead of branching into multiple bridge methods
+- Dart `downloadByStrategy` now sends a single request to Go (`downloadByStrategy` channel); routing concern is centralized in Go backend
+- Legacy Dart bridge methods (`downloadTrack`, `downloadWithFallback`, `downloadWithExtensions`, `downloadFromYouTube`) are now thin wrappers and marked `@Deprecated`
+- Qobuz downloader updated to latest Jumo API contract (`/get` endpoint, required headers)
+- Amazon download flow now returns `decryption_key` from Go and performs decryption in Flutter (local file + SAF paths)
+- Amazon now uses the new `amazon.afkarxyz.fun` API flow (ASIN-based track endpoint + legacy fallback) with encrypted stream support
+- Amazon ASIN extraction rewritten with robust URL/query-param parsing and regex fallback
+- Amazon provider re-enabled in download service picker and download settings (alongside Tidal, Qobuz, and YouTube picker flow)
+- Track Metadata cover UI now refreshes from the embedded file after Edit Metadata/Re-enrich, so the displayed art matches actual file tags
+- Edit Metadata cover section moved to the top of the form and now previews current embedded cover before replacement (plus selected replacement preview)
+- Edit Metadata cover preview enlarged (120px to 160px) with shadow, side-by-side layout for current vs selected cover, and label repositioned below image
+
+### Fixed
+
+- Fixed lyrics mode "External .LRC" still embedding lyrics into metadata - `lyrics_mode` was not being sent to Go backend for single-service downloads and YouTube provider, causing Go to default to "embed"
+- Fixed `flutter_local_notifications` v20 breaking changes - migrated all `initialize()`, `show()`, and `cancel()` calls from positional parameters to named parameters
+- Fixed SAF duplicate folder bug: concurrent batch downloads creating empty folders with `(1)`, `(2)`, `(3)` suffixes - added synchronized lock to `ensureDocumentDir` in Kotlin with duplicate detection and cleanup
+- Track Metadata lyrics section now hides "Embed Lyrics" when lyrics are already embedded in file, preventing redundant embed attempts
+- Fixed lyrics embed path to support FLAC/MP3/Opus consistently (including SAF files) without forcing unsupported parser paths
+- Inconsistent parameter parity across download paths
+  - `downloadWithExtensions` now carries `copyright`
+  - YouTube path now carries `embed_max_quality_cover` and metadata parity fields
+- Inconsistent success response metadata between direct/fallback flows
+  - Added shared Go response builder for `DownloadTrack` and `DownloadWithFallback`
+  - Success responses now consistently include `genre`, `label`, `copyright`, and `lyrics_lrc`
+- YouTube success response now also includes extended metadata fields (`cover_url`, `genre`, `label`, `copyright`) for parity with other providers
+- Fixed `Save Lyrics` crash on Android (`java.lang.Integer cannot be cast to java.lang.Long`) by normalizing `duration_ms` channel argument as `Number -> Long`
+- Fixed FLAC Re-enrich cover edge case where metadata could be written without cover when temp cover file creation failed; FLAC cover embed now uses in-memory bytes and verifies cover after write
+- Fixed FLAC picture-block embed robustness by detecting image MIME via magic bytes (JPEG/PNG/GIF/WEBP) instead of relying on filename extension
+- Fixed MP3/Opus metadata rewrite flows to preserve existing embedded cover when no new cover is available
+- Fixed Library tab cover not updating after manual cover edit/re-embed for downloaded tracks
+  - Queue/Library now prefers embedded cover art extracted from local files (not just cached `coverUrl`)
+  - Added per-track extraction cache with file-modification invalidation so updated embedded art is reflected in Library
+  - Extraction is now on-demand for edited tracks only (not full-library reload)
+  - Returning from Track Metadata now refreshes cover cache only for the affected track
+  - Cover refresh is now skipped when file modification time is unchanged, removing unnecessary flash when simply opening/closing metadata screen
+- Fixed repeated cover preview extraction in Track Metadata screen (`track_cover_preview_*`) causing visible flash when reopening
+  - Added in-memory preview cache keyed by file path so reopening metadata reuses existing preview without re-extract
+  - Cache validation uses file modification time for filesystem paths; SAF paths are refreshed only after successful edit actions
+  - Queue/Library now also compares SAF file last-modified (`getSafFileModTimes`) before refreshing embedded-cover cache
+  - Preview cache key is now stable per track item (not volatile temp SAF path), eliminating false cache misses on SAF-backed files
+  - Track Metadata no longer auto-extracts cover preview on every screen open; extraction now runs only after actual edit/re-enrich changes (or when explicitly forced)
+- Track metadata edits/re-enrich now sync updated tags back into `downloadHistoryProvider` + SQLite history rows
+  - Non-Library screens that read download history (Home/album/history views) now reflect updated title/artist/album/tags without manual rescan
+  - Track Metadata back-navigation now returns an explicit update result after successful edits/re-enrich, enabling History-tab cover refresh fallback when SAF timestamps are unreliable
+
+### Performance
+
+- Configured Flutter image cache limits (240 entries / 60 MiB) and added `ResizeImage` wrappers for cover art precaching across all screens, reducing peak memory usage on cover-heavy pages
+- Added LRU eviction to Deezer cache with configurable max entries per cache type (search/album/artist/ISRC) and periodic expired-entry cleanup to prevent unbounded memory growth in long sessions
+- Download progress notifications are now normalized (2-decimal progress, 1-decimal speed, 0.1 MiB byte steps) and deduplicated by track/artist/percent/queue-count, reducing notification overhead during batch downloads
+- Each queue item now uses a dedicated `ConsumerWidget` with per-item `.select()` instead of rebuilding the entire list on any item change; items are wrapped in `RepaintBoundary` for paint isolation
+- Queue/Library search indexes are now built on-demand per item instead of upfront for all items, with bounded LRU caches (max 4000 entries)
+- `copyWith` now preserves derived lookup indexes (ISRC map, track key set) when items list is unchanged, avoiding O(n) rebuild on every scan progress update
+- Scan progress polling now compares values before calling `setState`, skipping unnecessary widget rebuilds when nothing changed
+- Added in-flight flag to download progress and library scan polling to prevent concurrent timer callbacks from overlapping
+- New `DownloadedEmbeddedCoverResolver` service replaces per-screen cover extraction logic with a shared bounded cache (160 entries), mod-time validation, and throttled refresh checks
+- Multiple embedded cover change callbacks are now coalesced into a single frame via `addPostFrameCallback`, preventing redundant rebuilds
+- Downloaded album screen now caches filtered/sorted track lists and reuses them when the source data reference is unchanged
+- Home tab recent downloads now use single-pass aggregation instead of building full per-album lists, and store only IDs instead of full item objects for the clear-all action
+- Removed duplicate `_downloadedSpotifyIds` Set and `_isrcSet` (both now use existing map lookups), removed unused `_isTyping` state in home tab
+- Track cache pre-warming is now capped at 80 tracks per request to avoid excessive backend calls on large playlists
+- About page contributor avatars now use `memCacheWidth`/`memCacheHeight` to decode at display size instead of full resolution
+- Orphaned download cleanup now checks file existence in parallel (chunk 16) instead of sequentially
+- Local library `findByTrackAndArtist` now uses O(1) map lookup (`_byTrackKey`) instead of O(n) linear scan
+- Local library database load and SharedPreferences fetch now run in parallel
+- Legacy mod-time backfill now uses chunked parallel `File.stat` (chunk 24) with per-chunk cancel check
+- Downloaded album screen now caches disc grouping, sorted disc numbers, common quality, and embedded cover path with reference-identity invalidation
+- Local album screen common quality is now computed once during cache rebuild instead of per-build
+- Batch delete in album screens now uses O(1) map lookup (`tracksById`) instead of `.where().firstOrNull`
+- Cache management page now fires all async init calls in parallel and uses chunked async directory deletion (chunk 24)
+- Cover resolver preview file existence check is now throttled (2.2s interval) to reduce synchronous I/O in build path
+- History and library database DELETE operations are now chunked (500 per batch) to stay within SQLite variable limits
+- Library database `cleanupMissingFiles` now checks file existence in parallel (chunk 16) and deletes in batched SQL
+
+### Security
+
+- All logs (Go and Dart) now automatically redact Bearer tokens, access/refresh tokens, client secrets, API keys, and passwords using regex-based sanitization before storage
+- Extension auth URLs are now validated for HTTPS-only, no embedded credentials, and no private/local network targets before opening
+- Auth URLs in logs are summarized to scheme+host+path only (query params stripped) to prevent token leakage; token exchange error bodies are truncated and sanitized
+- Extension HTTP requests now block URLs with embedded credentials (`user:pass@host`)
+- Extension storage files changed from `0644` to `0600` (owner-only read/write)
+- All SAF relative directory paths are now sanitized per-segment with `.`/`..` filtering; all user-provided file names pass through `sanitizeFilename()` before use
+- Extension ID is sanitized before building download destination path
+- Log export device info now shows Build ID and Security Patch level instead of masked Device ID
+
+### Technical
+
+- Centralized request serialization in `PlatformBridge` via shared invoke helper and unified payload model
+- Go strategy router normalizes incoming service casing before dispatch
+- Extension runtime: `customSearch` now passes query/options via VM globals instead of string interpolation, preventing parser edge cases on certain devices
+- Extension runtime: JS panic handler now logs full stack trace for easier debugging
+- `DownloadQueueLookup` expanded with `byItemId` map and `itemIds` list for O(1) queue item access from UI
+- Non-error/non-fatal log entries are now skipped entirely (not just hidden) when detailed logging is disabled, reducing buffer growth and Go log polling overhead
+
+### Removed
+
+- Buy Me a Coffee references removed from donate page, FUNDING.yml, README, and all localization files (account suspended)
+
+---
+
+## [3.6.0] - 2026-02-09
+
+### Highlights
+
+- **YouTube Provider (Lossy)**: New download option via Cobalt API for tracks not available on lossless services
+  - Opus 256kbps (recommended) or MP3 320kbps quality options
+  - Full metadata embedding: cover art, title, artist, album, track/disc number, year, ISRC
+  - Lyrics fetching from lrclib.net with embed and external .lrc support
+  - Works as fallback when Tidal/Qobuz/Amazon downloads fail
+- **Edit Metadata**: Edit embedded metadata directly from the Track Metadata screen (FLAC, MP3, Opus)
+  - Editable fields: Title, Artist, Album, Album Artist, Date, Track#, Disc#, Genre, ISRC
+  - Advanced fields: Label, Copyright, Composer, Comment
+  - FLAC: native Go writer, MP3/Opus: FFmpeg-based writer
+  - UI refreshes in-place after save without needing to re-open the screen
+  - iOS and Android support
+
+### Added
+
+- Save Cover Art: download high-quality album art as standalone .jpg from track metadata screen
+- Save Lyrics (.lrc): fetch and save lyrics as standalone .lrc file without downloading the song
+- Re-enrich Metadata: re-embed metadata, cover art, and lyrics into existing audio files without re-downloading (FLAC native, MP3/Opus via FFmpeg)
+- Re-enrich now supports local library items: searches Spotify/Deezer by track name + artist to fetch complete metadata from the internet, then embeds cover art, lyrics, genre, label, and all tags into the file
+- YouTube download provider using Cobalt API with SongLink/Odesli integration for Spotify/Deezer ID → YouTube URL conversion
+- SpotubeDL as fallback Cobalt proxy when primary API fails
+- YouTube video ID detection for YT Music extension compatibility
+- Parallel cover art and lyrics fetching during YouTube download
+- Queue progress now shows "X.X MB" instead of "0%" for streaming downloads where total size is unknown (Cobalt tunnel mode)
+- Full metadata pipeline for YouTube downloads: cover art, lyrics, title, artist, album, track#, disc#, year, ISRC
+
+### Changed
+
+- Removed Tidal HIGH (lossy AAC) quality option - use YouTube provider for lossy downloads instead
+- Simplified download service picker by removing dead lossy format code
+- Removed Amazon from download settings UI (now only used as automatic fallback)
+- Cleaned up dead disabled-chip code in download service selector
+
+### Fixed
+
+- Fixed `error.api.youtube.login` by using YouTube Music URLs instead of regular YouTube URLs for Cobalt requests
+- Fixed SongLink to prioritize `youtubeMusic` platform URL over `youtube` for Cobalt compatibility
+- Fixed YouTube metadata not being overwritten by setting `DisableMetadata: true` in Cobalt requests
+- Fixed ISRC validation in metadata enrichment flow - invalid ISRCs no longer trigger failed Deezer lookups
+- Fixed YouTube metadata enrichment to work like other providers (SongLink Deezer ID extraction, proper metadata embedding)
+- Go metadata parsers now read Composer, Comment, Label, Copyright from FLAC, MP3 (ID3v2.2/v2.3/v2.4), and Opus/OGG files
+- Added proper COMM frame parser for ID3v2 (handles language code + description prefix correctly)
+- Fixed Re-enrich Metadata failing on SAF storage files (`content://` URIs) - Kotlin now copies SAF file to temp, Go processes temp file, then writes back for FLAC or returns temp path for FFmpeg (MP3/Opus)
+- Fixed Save Cover Art and Save Lyrics crashing on SAF-stored download history items - now saves to temp then writes to SAF tree via `createSafFileFromPath`
+- Fixed `_getFileDirectory()` crash when called with `content://` URI by adding SAF guard
+- Fixed `readAudioMetadata` Kotlin handler not handling SAF URIs - now copies to temp for reading
+- Added metadata summary log in Re-enrich flow showing all fields before embedding (title, artist, album, track#, disc#, date, ISRC, genre, label)
+
+---
+
+## [3.5.3] - 2026-02-09
+
+### Added
+
+- CSV import flow now includes a new option: **Skip already downloaded songs** before enqueueing tracks
+- Added regression test suite for cross-script matching behavior in Go backend (`go_backend/matching_test.go`)
+
+### Changed
+
+- CSV import confirmation dialog now supports filtering out tracks already present in download history (matched by Spotify ID and ISRC)
+- CSV import enqueue feedback now reports added/skipped counts when duplicate downloads are skipped
+- Home search now prioritizes **Recent Access** when search field is focused with empty input, even if old search results still exist in memory
+- Search filter/result sections are now hidden while Recent Access mode is active to avoid stale-result overlap
+- Recent Access now shows a localized empty-state message when no recent items are available
+- Normalized collapsing AppBar top inset across iOS/Android so header height/animation stays visually consistent on Apple devices
+- Storage & Cache UX improved: `Clear all cache` now preserves web/runtime cache by default (optional), with explicit warnings/actions for runtime cache resets
+- Local library settings now include a display count for tracks excluded because they already exist in download history
+- Responsive layout tuning applied across key screens to reduce hardcoded-height overflow issues on smaller devices
+
+### Fixed
+
+- Fixed false-positive cross-script matching in Qobuz/Tidal where unrelated titles/artists in different scripts could be incorrectly accepted
+- Cross-script title/artist matching now requires transliteration-aware normalization and strict similarity checks instead of auto-accepting script differences
+- Qobuz metadata fallback no longer scans all results when zero title matches are found; title verification is now required
+- Qobuz metadata final validation now rejects results when title does not match expected track name
+- Fixed Home search regression where Recent Access panel could disappear after previous searches
+- Fixed Local Library card/layout crash caused by `Flex` usage under unbounded height constraints
+- Hardened FFmpeg metadata embedding temp-file naming to prevent rare collisions during parallel downloads/fallback flows (Qobuz → Tidal) that could cause missing embedded metadata
+- Fixed SAF external lyrics naming where some providers saved `.lrc` files as `.lrc.txt`; LRC export now uses neutral MIME to preserve `.lrc` extension
+
+## [3.5.2] - 2026-02-08
+
+### Performance
+
+- Home tab search result sections are now virtualized with `SliverList` (lazy item build) instead of eager `Column` rendering, reducing frame drops on large result sets
+- Home tab now narrows Riverpod subscriptions using field-level `select(...)` for search/provider state to reduce unnecessary full-tab rebuilds
+- Search provider dropdown now watches only required fields (`searchProvider`, `metadataSource`, `extensions`) instead of full provider states
+- Track row rendering in Home search now receives precomputed thumbnail sizing/local-library flags from parent to avoid repeated per-item provider watches
+- Removed thumbnail `debugPrint` calls inside track row `build()` to reduce runtime overhead during scrolling/rebuilds
+- Queue tab root subscription no longer watches full queue item list; it now watches only queue presence (`items.isNotEmpty`) to avoid full Library UI rebuilds on every progress tick
+- Queue download header/list rendering has been isolated into dedicated `Consumer` slivers; header now watches only queue length (`items.length`) while item list watches queue item updates
+- Queue filter/sort computations are now centralized and memoized per filter mode within a build pass (`all`/`albums`/`singles`), reducing repeated list transforms for chip counts and page content
+- Selection bottom bar content is now computed only when selection mode is active, removing hidden-state heavy list preparation
+- File existence checks in queue/library rows now use per-path `ValueNotifier` + `ValueListenableBuilder` updates instead of triggering global `setState`, reducing unnecessary whole-tab repaints
+
+### Changed
+
+- Replaced date range filter with sorting options in Library tab: Latest, Oldest, A-Z, Z-A
+- Sorting applies to all views: unified items, downloaded albums, and local library albums
+- Local library items now use file modification time (`fileModTime`) for sorting instead of scan time, providing more accurate chronological ordering
+- Removed redundant manual "Export Failed Downloads" button from Library UI (auto-export setting in Settings is sufficient)
+- Library filters (quality, format, source) now correctly apply to album tabs and update tab chip counts (All/Albums/Singles)
+
+### Fixed
+
+- Fixed local library scan crashing on Samsung One UI devices due to MediaStore URI mismatch in SAF tree traversal
+- Added MediaStore URI fallback in SAF file reader: when SAF permission is denied for Samsung-returned MediaStore URIs, automatically retries using READ_MEDIA_AUDIO permission
+- Hardened SAF scan with per-directory and per-file error handling: scan now skips problematic files instead of aborting entirely
+- Added visited directory tracking to prevent infinite loops from circular SAF references
+- Fixed metadata enrichment cascading failure after one queued download fails: metadata APIs (Deezer, SongLink, Spotify) now use isolated `metadataTransport` so failed download connections cannot poison metadata requests
+- Added immediate connection cleanup on every download failure path (error response and exception), not only periodic cleanup every N downloads
+- Fixed incremental SAF scan edge case where `lastModified()` failure could misclassify existing files as removed (`removedUris`)
+- Fixed tracks marked "In Library" still showing active download button - download button now shows as completed (checkmark) for local library tracks across all screens (album, playlist, artist, home/search)
+- Fixed FFmpeg M4A-to-FLAC conversion erroneously triggered on already-existing FLAC files when re-downloading duplicates via Tidal
+- Fixed SAF download creating empty artist/album folders when re-downloading duplicate tracks; directory is now only created after confirming the file does not already exist
+
+## [3.5.1] - 2026-02-08
+
+### Performance
+
+- Removed PaletteService (palette_generator) from all screens for faster navigation and reduced memory usage
+- Album, Playlist, Downloaded Album, Local Album, and Track Metadata screens now use blurred cover art as header background instead of dominant color extraction
+- Removed `palette_generator` dependency
+- App startup now renders immediately (`runApp`) while service initialization runs asynchronously in eager init
+- Main shell provider subscriptions now use field-level `select(...)` to reduce unnecessary rebuilds
+- Settings persistence now uses single-flight + queued save coalescing to avoid redundant disk writes
+- Progress polling cadence adjusted to 800ms for download queue, local library scan progress, and Go log polling
+- Android foreground download service progress updates are throttled (change-based updates + 5s heartbeat)
+- SAF history repair is now batched (`20` items per batch) and capped per launch (`60`) to reduce startup I/O spikes
+- Incremental library scan now builds final item list in-memory instead of reloading from database
+- Local cover images in queue/library use direct `Image.file` with `errorBuilder` instead of `FutureBuilder` existence check
+- CSV parser `_parseLine` rewritten: correct escaped-quote handling, no quote characters in output
+- Removed unused legacy screen files (`home_screen.dart`, `queue_screen.dart`, `settings_screen.dart`, `settings_tab.dart`)
+- Incremental local library scan now merges delta results in-memory and sorts once, avoiding full-state reload churn
+- Queue local cover rendering now uses direct `Image.file` + `errorBuilder` (removed repeated async file-exists checks)
+
+### Added
+
+- Auto-cleanup orphaned downloads on history load (files that no longer exist are automatically removed from history)
+
+### Changed
+
+- Removed legacy screen files that were no longer used after the tab/part refactor:
+  - `lib/screens/home_screen.dart`
+  - `lib/screens/queue_screen.dart`
+  - `lib/screens/settings_screen.dart`
+  - `lib/screens/settings_tab.dart`
+- Concurrent download limit increased from `3` to `5` (settings clamp + Options UI chips now support `1..5`)
+- Download queue now uses a single parallel scheduler path; `1` concurrency is handled as parallel-with-limit-1 (no separate sequential engine)
+- Download queue now listens to settings updates in real-time so concurrency/output settings stay in sync while queue is active
+
+### Fixed
+
+- CSV parser now correctly handles escaped quotes (`""`) inside quoted fields during import
+- Fixed dynamic concurrency update during active downloads: changing limit (e.g. `1 -> 3`) now schedules additional queued items without waiting current active item to finish
+- Queue scheduler now re-checks capacity/queued items on short intervals to avoid blocking on long-running single active download
+
+### Dependencies
+
+#### Flutter
+- `flutter_local_notifications` 19.x → 20.0.0 (breaking: all positional params converted to named params)
+- `connectivity_plus` 6.x → 7.0.0
+- `flutter_secure_storage` 9.x → 10.0.0
+- Removed `palette_generator` dependency
+
+#### Go
+- `go-flac/go-flac` v1.0.0 → v2.0.4
+- `go-flac/flacvorbis` v0.2.0 → v2.0.2
+- `go-flac/flacpicture` v0.3.0 → v2.0.2
+- Go toolchain 1.24 → 1.25.7
+
+#### Android
+- Android Gradle Plugin 8.x → 9.0.0
+- Kotlin 2.1.x → 2.3.10
+- `desugar_jdk_libs` → 2.1.5
+- `kotlinx-coroutines-android` → 1.10.2
+- `lifecycle-runtime-ktx` → 2.10.0
+- `activity-ktx` → 1.12.3
+
+#### CI/CD
+- `actions/cache` v4 → v5
+- `actions/checkout` v4 → v6
+- `actions/setup-go` v5 → v6
+- `actions/setup-java` v4 → v5
+- `softprops/action-gh-release` v1 → v2
+- GitHub artifact actions updated
+
+---
+
+## [3.5.0] - 2026-02-07
+
+### Highlights
+
+- **SAF Storage (Android 10+)**: Proper Storage Access Framework support for download destination (content URIs)
+  - Select download folder via SAF tree picker
+  - Downloads now write to SAF file descriptors (`/proc/self/fd/*`) instead of raw filesystem paths
+  - Works around Android 10+ scoped storage permission errors
+- **Modern Onboarding Experience**: Completely redesigned Setup and Tutorial screens
+
+### Added
+
+- Home feed disk caching via SharedPreferences for instant restore on app startup
+- SAF display path resolver in native Android layer (converts tree URIs to readable paths)
+- New settings fields for storage mode + SAF tree URI
+- SAF platform bridge methods: pick tree, stat/exists/delete, open content URI, copy to temp, write back to SAF
+- SAF library scan mode (DocumentFile traversal + metadata read)
+- Incremental library scanning for filesystem and SAF paths (only scans new/modified files and detects removed files)
+- Force Full Scan action in Library Settings to rescan all files on demand
+- Downloaded files are now excluded from Local Library scan results to prevent duplicate entries
+- Legacy library rows now support `file_mod_time` backfill before incremental scans (faster follow-up scans after upgrade)
+- Library UI toggle to show SAF-repaired history items
+- Scan cancelled banner + retry action for library scans
+- Android DocumentFile dependency for SAF operations
+- Post-processing API v2 (SAF-aware, ready to replace v1)
+- Donate page in Settings with Ko-fi and Buy Me a Coffee links
+- Per-App Language support on Android 13+ (locale_config.xml)
+- Interactive tutorial with working search bar simulation and clickable download buttons
+- Tutorial completion state is persisted after onboarding
+- Visual feedback animations for page transitions, entrance effects, and feature lists
+- New dedicated welcome step in setup wizard with improved branding
+
+### Changed
+
+- Download pipeline supports `output_path` + `output_ext` for Go backend
+- Tidal/Qobuz/Amazon/Extension downloads use SAF-aware output when enabled
+- Post-processing hooks run for SAF content URIs (via temp file bridge)
+- File operations in Library/Queue/Track screens now SAF-aware (`open`, `exists`, `delete`, `stat`)
+- Local Library scan defaults to incremental mode; full rescan is available via Force Full Scan
+- Local library database upgraded to schema v3 with `file_mod_time` tracking for incremental scan cache
+- Platform channels expanded with incremental scan APIs (`scanLibraryFolderIncremental`) on Android and iOS
+- Android platform channel adds `getSafFileModTimes` for SAF legacy cache backfill
+- Android build tooling upgraded to Gradle 9.3.1 (wrapper)
+- Android build path validated with Java 25 (Gradle/Kotlin/assemble debug)
+- SAF tree picker flow in `MainActivity` migrated to Activity Result API (`registerForActivityResult`)
+- `MainActivity` host migrated to `FlutterFragmentActivity` for SAF picker compatibility
+- Legacy `startActivityForResult` / `onActivityResult` SAF picker path removed
+- Setup screen UI polish: smaller logo, thin outline borders on text fields
+- Removed support section from About page (moved to Donate page)
+- Qobuz squid.wtf region fallback for blocked regions
+- Setup screen converted to PageView flow with animated progress bar and modern card layouts
+- Tutorial screen aligned with Setup Screen design, updated typography and softened UI shapes
+- Larger, more accessible navigation buttons for onboarding flow
+- Reduced visual noise by removing unnecessary glow effects
+
+### Fixed
+
+- Android 10+ `permission denied` when writing to `/storage/emulated/0` (now handled via SAF)
+- SAF history repair: auto-resolve missing content URIs using tree + filename
+- SAF download fallback: retry in app-private storage when SAF write fails
+- Tidal DASH manifest writing when output path is a file descriptor (no invalid `.m4a` path)
+- External LRC output in SAF mode
+- Restored old-device renderer fallback while using `FlutterFragmentActivity` by injecting shell args from a custom `FlutterFragment` (`--enable-impeller=false` on problematic devices)
+- Preserved Flutter fragment creation behavior (cached engine, engine group, new engine) while adding Impeller fallback support
+- SAF tree picker result now consistently returns `tree_uri` payload with persisted URI permission handling
+- SAF share file now copies to temp before sharing (fixes share from SAF content URI)
+- Home feed not updating after installing extension with homeFeed capability (no longer requires app restart)
+- Library scan hero card showing 0 tracks during scan (now shows scanned file count in real-time)
+- Library folder picker no longer requires MANAGE_EXTERNAL_STORAGE on Android 10+ (uses SAF tree picker)
+- One-time SAF migration prompt for users updating from pre-SAF versions
+- Fixed `fileModTime` propagation across Go/Android/Dart so incremental scan cache is stored and reused correctly
+- Fixed SAF incremental scan key mismatch (`lastModified` vs `fileModTime`) and normalized result fields (`skippedCount`, `totalFiles`)
+- Fixed incremental scan progress when all files are skipped (`scanned_files` now reaches total files)
+- Removed duplicate `"removeExtension"` branch in Android method channel handler (eliminates Kotlin duplicate-branch warning)
+
+---
+
+## [3.4.2] - 2026-02-04
+
+### Improved
+
+- **Mobile Network Reliability**: All providers (Qobuz, Tidal, Amazon, Deezer) now have retry logic with exponential backoff
+  - Increased API timeouts: 15s → 25s (Deezer, Qobuz, Tidal), 30s (Amazon)
+  - Up to 3 retry attempts per API call (500ms → 1s → 2s backoff)
+  - Retryable: timeout, connection reset/refused, EOF, HTTP 5xx, HTTP 429
+- **SongLink ID Extraction**: Extract QobuzID/TidalID directly from SongLink URLs
+  - New fields in `TrackAvailability`: `QobuzID`, `TidalID`
+  - Qobuz/Tidal now use direct Track ID from SongLink instead of re-parsing URLs
+- **Qobuz Download Flow**: New Strategy 3 - get QobuzID from SongLink before ISRC search
+  - Cache hit now uses `GetTrackByID()` directly instead of searching again
+  - Pre-warm cache tries SongLink first before direct ISRC search
+- **Tidal Download Flow**: Use `availability.TidalID` directly from SongLink struct
+
+---
+
+## [3.4.1] - 2026-02-04
+
+### Fixed
+
+- Metadata Priority order now persists after app restart
+- Download Provider Priority order now persists after app restart
+
+---
+
+## [3.4.0] - 2026-02-03
+
+### Highlights
+
+- **Local Library Scanning** ([#117](https://github.com/zarzet/SpotiFLAC-Mobile/issues/117)): Scan existing music collection to detect duplicates (FLAC, M4A, MP3, Opus, OGG)
+- **Duplicate Detection** ([#117](https://github.com/zarzet/SpotiFLAC-Mobile/issues/117)): "In Library" badge on tracks matching by ISRC or track name + artist
+- **Unified Library Tab**: History renamed to Library, shows Downloaded + Local Library tracks with source badges
+
+### Added
+
+- Local Album Screen with cover art, disc grouping, and selection mode
+- Albums tab shows local library albums with folder icon badge
+- Singles filter includes local library singles
+- Advanced library filters: Source, Quality, Format, Date
+- Cover art extraction from embedded tags (FLAC, MP3, Opus/Ogg)
+- "Already in Library" notification when downloading existing tracks
+- Spotify secrets now stored in secure storage (`flutter_secure_storage`)
+- **Multi-Service Link Support**: Share links from Deezer, Tidal, and YouTube Music (in addition to Spotify)
+  - Deezer: Full support for track, album, playlist, artist links
+  - Tidal: Track links converted via SongLink to Spotify/Deezer for metadata
+  - YouTube Music: Handled via ytmusic extension URL handler
+- Local library tracks now open metadata screen on tap
+
+### Changed
+
+- Extension HTTP sandbox enforces HTTPS and blocks private IPs
+- Extension file sandbox validates paths with boundary-safe checks
+
+### Fixed
+
+- Search filter bar now only appears after results load, not during loading
+- MP3/Ogg metadata parsing (ID3v2 extended headers, Ogg packet reassembly)
+- Library scan metadata (ISRC, disc number, release date)
+- Cover cache robustness (size + mtime cache key)
+- Local library selection and delete in list/grid views
+- Albums/Singles count includes local library items
+
+---
+
+## [3.3.6] - 2026-02-02
+
+### Added
+
+- **WiFi-Only Download Mode**: Pause downloads on mobile data, auto-resume on WiFi (Settings > Download > Download Network)
+- Added `connectivity_plus: ^6.0.3` dependency
+
+---
+
 ## [3.3.5] - 2026-02-01

 Same as 3.3.1 but fixes crash issues caused by FFmpeg.
@@ -30,7 +613,7 @@ Same as 3.3.1 but fixes crash issues caused by FFmpeg.
 - **Lossy Bitrate Options**: MP3 (320/256/192/128kbps), Opus (128/96/64kbps)
 - **Search Filters**: Filter results by type (Tracks, Artists, Albums, Playlists)
 - **Album/Playlist Search**: Deezer search now includes albums and playlists
- **New Languages**: Turkish (Kaan, BedirhanGltkn), Japanese (Re*Index.(ot_inc))
+- **New Languages**: Turkish (Kaan, BedirhanGltkn), Japanese (Re\*Index.(ot_inc))
 - **Optional All Files Access**: Android 13+ no longer requires full storage access; enable in Settings if needed
 - **Improved VPN Compatibility**: Better HTTP/2 support for users behind VPN or restricted networks

@@ -131,31 +714,26 @@ Same as 3.3.1 but fixes crash issues caused by FFmpeg.
  - Perfect for players like Samsung Music that prefer external .lrc files
  - LRC files include metadata headers (title, artist, by:SpotiFLAC-Mobile)
  - Works with all download services (Tidal, Qobuz, Amazon)
-
 - **CSV Import Quality Selection**: Choose audio quality when importing CSV playlists
  - Quality picker now appears before adding CSV tracks to download queue
  - Select between FLAC qualities (Lossless, Hi-Res, Hi-Res Max) or MP3
  - Respects "Ask quality before download" setting - uses default quality if disabled
-
  - **Persistent Cover Image Cache**: Album/track cover images now cached to persistent storage instead of temporary directory
  - Cover images no longer disappear when app is closed or device restarts
  - Cache stored in `app_flutter/cover_cache/` directory (not cleared by system)
  - Maximum 1000 images cached for up to 365 days
  - Covers are cached when displayed in History, Home, Album, Artist, or any other screen
  - New `CoverCacheManager` service with `clearCache()` and `getStats()` methods for future cache management
-
 - **Extended Metadata from Deezer Enrichment**: Track downloads now include label, copyright, and genre metadata from Deezer
  - New fields in `ExtTrackMetadata`: `label`, `copyright`, `genre`
  - Metadata fetched during `enrichTrack()` via Deezer album API
  - Embedded as FLAC Vorbis comments: `GENRE`, `ORGANIZATION` (label), `COPYRIGHT`
  - Works for both extension downloads and built-in provider downloads (Tidal, Qobuz, Amazon)
-
 - **Track Metadata Screen Extended Info**: Genre, label, and copyright now displayed in track metadata screen
  - Added `genre`, `label`, `copyright` fields to `DownloadHistoryItem` model
  - Metadata is stored in download history and persists across app restarts
  - New localization strings: `trackGenre`, `trackLabel`, `trackCopyright`
-
- **`utils.randomUserAgent()` for Extensions**: New utility function for extensions to get random browser User-Agent strings
+- `**utils.randomUserAgent()` for Extensions\*\*: New utility function for extensions to get random browser User-Agent strings
  - Returns modern Chrome User-Agent format: `Chrome/{120-145}.0.{6000-7499}.{100-299}` with `Windows NT 10.0`
  - Useful for extensions that need to rotate User-Agents to avoid detection

@@ -164,7 +742,6 @@ Same as 3.3.1 but fixes crash issues caused by FFmpeg.
 - **Portuguese Language Bug**: Fixed locale parsing for languages with country codes (e.g., pt_PT, es_ES)
  - App now correctly loads Portuguese and Spanish translations
  - Updated Portuguese label to "Português (Brasil)"
-
 - **VM Race Condition Panic**: Fixed `panic during execution: runtime error: index out of range [-2]` crash when switching search providers
  - Root cause: Goja VM was being accessed concurrently by multiple goroutines without synchronization
  - Added `VMMu sync.Mutex` to `LoadedExtension` struct
@@ -173,16 +750,13 @@ Same as 3.3.1 but fixes crash issues caused by FFmpeg.
    - `EnrichTrack`, `CheckAvailability`, `GetDownloadURL`, `Download`
    - `CustomSearch`, `HandleURL`, `MatchTrack`, `PostProcess`
  - Prevents race conditions when rapidly switching between extension search providers
-
 - **Tidal Release Date Fallback**: Fixed missing release date in FLAC metadata when downloading from Tidal
  - Now uses Tidal API's release date when `req.ReleaseDate` is empty
  - Ensures release date is always embedded in downloaded files
-
 - **Extended Metadata for M4A→FLAC Conversion**: Fixed genre, label, and copyright not being embedded when converting Amazon M4A to FLAC
  - Flutter now extracts extended metadata from Go backend response
  - Passes `genre`, `label`, `copyright` parameters to `_embedMetadataAndCover()`
  - Tags correctly embedded during FFmpeg conversion
-
 - **Extended Metadata for MP3 Conversion**: Genre, label, and copyright now embedded in MP3 files when converting from FLAC
  - Added `genre`, `label`, `copyright` parameters to `_embedMetadataToMp3()`
  - Tags embedded as ID3v2: `GENRE`, `ORGANIZATION` (label), `COPYRIGHT`
@@ -243,7 +817,6 @@ Same as 3.3.1 but fixes crash issues caused by FFmpeg.
  - `go_backend/httputil.go`: Updated `getRandomUserAgent()` to use modern Chrome versions
  - `go_backend/tidal.go`: Added release date fallback logic
  - `go_backend/exports.go`: Added `Genre`, `Label`, `Copyright` fields to `DownloadResponse`
-
 - **Flutter Changes**:
  - `lib/services/cover_cache_manager.dart`: New persistent cache manager for cover images (365 days, 1000 images max)
  - `lib/widgets/cached_cover_image.dart`: Wrapper widget for CachedNetworkImage with persistent cache
@@ -268,7 +841,6 @@ Same as 3.3.1 but fixes crash issues caused by FFmpeg.
  - Spanish: Credits 125 ([@credits125](https://crowdin.com/profile/credits125))
  - Portuguese: Pedro Marcondes ([@justapedro](https://crowdin.com/profile/justapedro))
  - Russian: Владислав ([@odinokiy_kot](https://crowdin.com/profile/odinokiy_kot))
-
 - **Quick Search Provider Switcher** ([#76](https://github.com/zarzet/SpotiFLAC-Mobile/issues/76)): Dropdown menu in search bar for instant provider switching
  - Tap the search icon to reveal a dropdown menu with all available search providers
  - Shows default provider (Deezer based on metadata source setting) at the top
@@ -278,56 +850,46 @@ Same as 3.3.1 but fixes crash issues caused by FFmpeg.
  - Search hint text updates immediately when switching providers
  - Re-triggers search automatically if there's existing text in the search bar
  - Eliminates need to navigate to Settings > Extensions > Search Provider
-
 - **Extension Button Setting Type** ([#74](https://github.com/zarzet/SpotiFLAC-Mobile/issues/74)): New setting type for extension actions
  - Extensions can define `button` type in manifest settings
  - Triggers JavaScript function when tapped (e.g., start OAuth flow)
  - Useful for authentication, manual sync, or any custom action
-
 - **Genre & Label Metadata** ([#75](https://github.com/zarzet/SpotiFLAC-Mobile/issues/75)): Downloaded tracks now include genre and record label information
  - Fetches genre and label from Deezer album API for each track
  - Embeds GENRE, ORGANIZATION (label), and COPYRIGHT tags into FLAC files
  - Works automatically when Deezer track ID is available (via ISRC matching)
  - Supports all download services (Tidal, Qobuz, Amazon) and extension downloads
-
 - **MP3 Quality Option** ([#69](https://github.com/zarzet/SpotiFLAC-Mobile/issues/69)): Optional MP3 download format with FLAC-to-MP3 conversion
  - New "Enable MP3 Option" toggle in Settings > Download > Audio Quality
  - When enabled, MP3 (320kbps) appears as a quality option alongside FLAC options
  - Available in both the quality picker dialog and default quality settings
  - Works with all services (Tidal, Qobuz, Amazon) and extensions
-
 - **MP3 Metadata Embedding**: Full metadata support for MP3 files
  - Cover art embedded using ID3v2 tags
  - Synced lyrics embedded (fetched from lrclib.net)
  - All metadata preserved: title, artist, album, album artist, track/disc number, date, ISRC
  - Automatic tag conversion from Vorbis comments (FLAC) to ID3v2 (MP3)
-
 - **Dominant Color Header**: Album, Playlist, Downloaded Album, and Track Metadata screens now feature dynamic header backgrounds
  - Extracts dominant color from cover art using `palette_generator`
  - Creates a gradient from dominant color to theme surface color
  - Smooth 500ms color transition animation
-
 - **Larger Cover Art**: Cover images on detail screens are now 50% of screen width (previously 140px fixed)
  - More prominent album artwork display
  - Larger shadow and rounded corners (20px radius)
  - Higher resolution cover caching
-
 - **Sticky Title**: Title appears in AppBar when scrolling past the info card
  - Smooth fade-in animation (200ms) when scrolling down
  - Title hidden when header is expanded (shows in info card instead)
  - AppBar uses theme color (surface) for clean, native look
  - Works on Album, Playlist, Downloaded Album, Track Metadata, and Artist screens
-
 - **Artist Name in Album Screen**: Album info card now displays artist name below album title
  - Extracted from first track's artist metadata
  - Styled with `onSurfaceVariant` color for visual hierarchy
-
 - **Disc Separation for Multi-Disc Albums** ([#70](https://github.com/zarzet/SpotiFLAC-Mobile/issues/70)): Downloaded albums with multiple discs now display tracks grouped by disc
  - Visual disc separator header showing "Disc 1", "Disc 2", etc.
  - Tracks sorted by disc number first, then by track number
  - Single-disc albums display normally without separators
  - Fixes confusion when albums have duplicate track numbers across discs
-
 - **Album Grouping in Recents** ([#70](https://github.com/zarzet/SpotiFLAC-Mobile/issues/70)): Downloads now show as albums instead of individual tracks in the Recent section
  - Prevents flooding the recents list when downloading full albums
  - Groups tracks by album name and artist
@@ -340,7 +902,6 @@ Same as 3.3.1 but fixes crash issues caused by FFmpeg.
  - MP3 files now saved in the same folder as FLAC (no separate MP3 subfolder)
  - Original FLAC file automatically deleted after successful conversion
  - New `embedMetadataToMp3()` method for MP3-specific tag embedding
-
 - **Sticky Header Theme Integration**: AppBar background uses `colorScheme.surface` instead of dominant color when collapsed
  - Dark theme: Black background with white text
  - Light theme: White background with black text
@@ -352,12 +913,10 @@ Same as 3.3.1 but fixes crash issues caused by FFmpeg.
  - MP3 files now show "320kbps" instead of FLAC's bit depth/sample rate
  - History no longer stores FLAC audio specs for converted MP3 files
  - Both File Info badges and metadata grid show correct MP3 quality
-
 - **Empty Catch Blocks**: Fixed analyzer warnings for empty catch blocks
  - `download_queue_provider.dart`: Added comments explaining why polling errors are silently ignored
  - `track_provider.dart`: Added comments explaining why availability check errors are silently ignored
  - `ffmpeg_service.dart`: Added proper error logging for temp file cleanup failures
-
 - **Russian Plural Forms**: Fixed ICU syntax warnings in Russian localization
  - Removed redundant `=1` clauses that were overriding `one` plural category
  - Affected 10 plural strings including track counts and delete confirmations
@@ -377,24 +936,20 @@ Same as 3.3.1 but fixes crash issues caused by FFmpeg.
  - Thread-safe cache with automatic expiration
  - Cache key based on artist, track, and duration
  - Log indicator shows "(cached)" when lyrics are served from cache
-
 - **Lyrics Duration Matching**: Improved lyrics accuracy with duration-based matching
  - Compares track duration with lrclib.net results
  - 10-second tolerance to handle version differences (radio edit, remaster, etc.)
  - Prioritizes synced lyrics over plain text when duration matches
  - Falls back gracefully if no duration match found
-
 - **Deezer Cover Art Upgrade**: Cover art from Deezer CDN now automatically upgraded to maximum quality
  - Detects Deezer CDN URLs (`cdn-images.dzcdn.net`)
  - Upgrades cover resolution to 1800x1800 (max available)
  - Works alongside existing cover upgrade
-
 - **Live Search for Extensions**: Search-as-you-type functionality for extension search
  - 800ms debounce delay to prevent excessive API calls
  - Minimum 3 characters required before searching
  - Concurrency control to prevent race conditions in extension runtime
  - Queues pending searches if a search is already in progress
-
 - **Russian Language Support**: Added Russian (Русский) translation - 99% complete
  - Translated via Crowdin community contributions
  - Covers all UI elements, settings, and error messages
@@ -405,12 +960,10 @@ Same as 3.3.1 but fixes crash issues caused by FFmpeg.
  - Added per-directory build lock using `sync.Map` and `sync.Mutex`
  - Double-check locking pattern ensures index is built only once
  - Significantly improves performance during CSV import with many tracks
-
 - **Queue Tab Scroll Exception**: Fixed Flutter rendering exception with NestedScrollView
  - Disabled Material 3 stretch overscroll indicator that caused `_StretchController` assertion
  - Wrapped NestedScrollView with ScrollConfiguration to prevent `setState during build` errors
  - Issue was especially noticeable during rapid queue updates (CSV import)
-
 - **CSV Import**: Fixed CSV export not being parsed correctly
  - Added support for `Artist Name(s)` header (with parentheses)
  - Added support for `Track URI` header for track IDs
@@ -477,4 +1030,4 @@ SpotiFLAC 3.0 introduces a powerful extension system that allows third-party int

 ---

-*For older versions, see [GitHub Releases](https://github.com/zarzet/SpotiFLAC-Mobile/releases)*
+_For older versions, see [GitHub Releases_](https://github.com/zarzet/SpotiFLAC-Mobile/releases)
@@ -1,5 +1,5 @@
 [![GitHub All Releases](https://img.shields.io/github/downloads/zarzet/SpotiFLAC-Mobile/total?style=for-the-badge&refresh=1)](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/516142f029a4f3642a899832a6f600acf07040170a98c106cd03222cf584d9a3)
+[![VirusTotal](https://img.shields.io/badge/VirusTotal-Safe-brightgreen?style=for-the-badge&logo=virustotal)](https://www.virustotal.com/gui/file/40f8f1914287dea317122a837f98b0ddf7af3205adc2f84a350d767e0a6a345c)
 [![Crowdin](https://img.shields.io/badge/HELP%20TRANSLATE%20ON-CROWDIN-%2321252b?style=for-the-badge&logo=crowdin)](https://crowdin.com/project/spotiflac-mobile)

 <div align="center">
@@ -24,15 +24,6 @@ Download music in true lossless FLAC from Tidal, Qobuz & Amazon Music — no acc
  <img src="assets/images/4.jpg?v=2" width="200" />
 </p>

-## Search Source
-
-SpotiFLAC supports multiple search sources for finding music metadata:
-
-| Source | Setup |
-|--------|-------|
-| **Deezer** (Default) | No setup required |
-| **Extensions** | Install additional search providers from the Store |
-
 ## 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.
@@ -54,15 +45,8 @@ Download music in true lossless FLAC from Tidal, Qobuz & Amazon Music for Window

 ## Telegram

-<p align="center">
-  <a href="https://t.me/spotiflac">
-    <img src="https://img.shields.io/badge/Telegram-Channel-2CA5E0?style=for-the-badge&logo=telegram&logoColor=white" alt="Telegram Channel">
-  </a>
-
-  <a href="https://t.me/spotiflac_chat">
-    <img src="https://img.shields.io/badge/Telegram-Community-2CA5E0?style=for-the-badge&logo=telegram&logoColor=white" alt="Telegram Community">
-  </a>
-</p>
+[![Telegram Channel](https://img.shields.io/badge/CHANNEL-2CA5E0?style=for-the-badge&logo=telegram&logoColor=white)](https://t.me/spotiflac)
+[![Telegram Community](https://img.shields.io/badge/COMMUNITY-2CA5E0?style=for-the-badge&logo=telegram&logoColor=white)](https://t.me/spotiflac_chat)

 ## FAQ

@@ -87,9 +71,9 @@ A: Some countries have restricted access to certain streaming service APIs. If d

 ### Want to support SpotiFLAC-Mobile?

-_If this software is useful and brings you value, consider supporting the project by buying me a coffee. Your support helps keep development going._
+_If this software is useful and brings you value, consider supporting the project. Your support helps keep development going._

-[![Ko-fi](https://ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/zarzet) <a href="https://www.buymeacoffee.com/zarzet" target="_blank"><img src="https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png" alt="Buy Me A Coffee" style="height: 40px !important;width: 150px !important;" ></a>
+[![Ko-fi](https://ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/zarzet)


 ## Disclaimer
@@ -108,6 +92,16 @@ You are solely responsible for:
 The software is provided "as is", without warranty of any kind. The author assumes no liability for any bans, damages, or legal issues arising from its use.


+## API Credits
+
+- **Tidal**: [hifi-api](https://github.com/binimum/hifi-api), [music.binimum.org](https://music.binimum.org), [qqdl.site](https://qqdl.site), [squid.wtf](https://squid.wtf), [spotisaver.net](https://spotisaver.net)
+- **Qobuz**: [dabmusic.xyz](https://dabmusic.xyz), [squid.wtf](https://squid.wtf), [jumo-dl](https://jumo-dl.pages.dev)
+- **Amazon**: [AfkarXYZ](https://github.com/afkarxyz)
+- **Lyrics**: [LRCLib](https://lrclib.net), [Paxsenix](https://lyrics.paxsenix.org) (Apple Music/QQ Music lyrics proxy)
+- **YouTube Audio**: [Cobalt](https://cobalt.tools) via [qwkuns.me](https://qwkuns.me), [SpotubeDL](https://spotubedl.com)
+- **Track Linking**: [SongLink / Odesli](https://odesli.co), [IDHS](https://github.com/sjdonado/idonthavespotify)
+
+
 > [!TIP]
 >
 > **Star Us**, You will receive all release notifications from GitHub without any delay ~
@@ -96,11 +96,13 @@ repositories {
 }

 dependencies {
-    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.1.4")
+    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.1.5")
    
    // Include all AAR and JAR files from libs folder
    implementation(fileTree(mapOf("dir" to "libs", "include" to listOf("*.jar", "*.aar"))))
    
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3")
-    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.7.0")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.10.2")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.10.0")
+    implementation("androidx.documentfile:documentfile:1.1.0")
+    implementation("androidx.activity:activity-ktx:1.12.3")
 }
@@ -20,9 +20,9 @@
        android:label="SpotiFLAC"
        android:name="${applicationName}"
        android:icon="@mipmap/ic_launcher"
-        android:requestLegacyExternalStorage="true"
-        android:usesCleartextTraffic="true"
-        android:enableOnBackInvokedCallback="true">
+        android:usesCleartextTraffic="false"
+        android:enableOnBackInvokedCallback="true"
+        android:localeConfig="@xml/locale_config">

        <activity
            android:name=".MainActivity"
@@ -43,7 +43,7 @@
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>

-            <!-- Handle Spotify URL sharing -->
+            <!-- Handle music URL sharing (Spotify, Deezer, Tidal, YT Music) -->
            <intent-filter>
                <action android:name="android.intent.action.SEND" />
                <category android:name="android.intent.category.DEFAULT" />
@@ -57,6 +57,33 @@
                <category android:name="android.intent.category.BROWSABLE" />
                <data android:scheme="https" android:host="open.spotify.com" />
            </intent-filter>
+
+            <!-- Handle Deezer deep links -->
+            <intent-filter android:autoVerify="true">
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="https" android:host="www.deezer.com" />
+                <data android:scheme="https" android:host="deezer.com" />
+                <data android:scheme="https" android:host="deezer.page.link" />
+            </intent-filter>
+
+            <!-- Handle Tidal deep links -->
+            <intent-filter android:autoVerify="true">
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="https" android:host="tidal.com" />
+                <data android:scheme="https" android:host="listen.tidal.com" />
+            </intent-filter>
+
+            <!-- Handle YouTube Music deep links -->
+            <intent-filter android:autoVerify="true">
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="https" android:host="music.youtube.com" />
+            </intent-filter>
        </activity>

        <!-- Download Service -->
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<locale-config xmlns:android="http://schemas.android.com/apk/res/android">
+    <locale android:name="en" />
+    <locale android:name="ru" />
+    <locale android:name="es-ES" />
+    <locale android:name="id" />
+    <locale android:name="pt-PT" />
+    <locale android:name="ja" />
+    <locale android:name="tr" />
+    <locale android:name="de" />
+    <locale android:name="fr" />
+    <locale android:name="hi" />
+    <locale android:name="ko" />
+    <locale android:name="nl" />
+    <locale android:name="zh" />
+</locale-config>
@@ -22,7 +22,7 @@ subprojects {
            }
            
            // Add desugaring dependency to all Android subprojects
-            project.dependencies.add("coreLibraryDesugaring", "com.android.tools:desugar_jdk_libs:2.1.4")
+            project.dependencies.add("coreLibraryDesugaring", "com.android.tools:desugar_jdk_libs:2.1.5")
        }
        
        tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {
@@ -1,2 +1,2 @@
-org.gradle.jvmargs=-Xmx8G -XX:MaxMetaspaceSize=4G -XX:ReservedCodeCacheSize=512m -XX:+HeapDumpOnOutOfMemoryError
+org.gradle.jvmargs=-Xmx4G -XX:MaxMetaspaceSize=2G -XX:ReservedCodeCacheSize=256m -XX:+HeapDumpOnOutOfMemoryError
 android.useAndroidX=true
@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.1-all.zip
@@ -19,8 +19,8 @@ pluginManagement {

 plugins {
    id("dev.flutter.flutter-plugin-loader") version "1.0.0"
-    id("com.android.application") version "8.11.1" apply false
-    id("org.jetbrains.kotlin.android") version "2.3.0" apply false
+    id("com.android.application") version "8.13.2" apply false
+    id("org.jetbrains.kotlin.android") version "2.2.21" apply false
 }

 include(":app")
@@ -17,6 +17,13 @@ import (
 	"time"
 )

+// Amazon API timeout and retry configuration for mobile networks
+const (
+	amazonAPITimeoutMobile = 30 * time.Second // Longer timeout for unstable mobile networks
+	amazonMaxRetries       = 2                // Number of retry attempts
+	amazonRetryDelay       = 500 * time.Millisecond
+)
+
 type AmazonDownloader struct {
 	client *http.Client
 }
@@ -24,6 +31,8 @@ type AmazonDownloader struct {
 var (
 	globalAmazonDownloader *AmazonDownloader
 	amazonDownloaderOnce   sync.Once
+	amazonASINRegex        = regexp.MustCompile(`(?i)^B[0-9A-Z]{9}$`)
+	amazonASINFindRegex    = regexp.MustCompile(`(?i)B[0-9A-Z]{9}`)
 )

 // AfkarXYZResponse is the response from AfkarXYZ API
@@ -36,13 +45,10 @@ type AfkarXYZResponse struct {
 	} `json:"data"`
 }

-func amazonIsASCIIString(s string) bool {
-	for _, r := range s {
-		if r > 127 {
-			return false
-		}
-	}
-	return true
+// AmazonStreamResponse is the new response format from amazon.afkarxyz.fun/api/track/{asin}
+type AmazonStreamResponse struct {
+	StreamURL     string `json:"streamUrl"`
+	DecryptionKey string `json:"decryptionKey"`
 }

 func NewAmazonDownloader() *AmazonDownloader {
@@ -54,40 +60,195 @@ func NewAmazonDownloader() *AmazonDownloader {
 	return globalAmazonDownloader
 }

-func (a *AmazonDownloader) downloadFromAfkarXYZ(amazonURL string) (string, string, error) {
-	apiURL := "https://amazon.afkarxyz.fun/convert?url=" + url.QueryEscape(amazonURL)
+// fetchAmazonURLWithRetry fetches from AfkarXYZ API with retry logic for mobile networks.
+// Returns downloadURL, suggested fileName, optional decryptionKey.
+func (a *AmazonDownloader) fetchAmazonURLWithRetry(amazonURL string) (string, string, string, error) {
+	var lastErr error
+	for attempt := 0; attempt <= amazonMaxRetries; attempt++ {
+		if attempt > 0 {
+			delay := amazonRetryDelay * time.Duration(1<<(attempt-1)) // Exponential backoff
+			GoLog("[Amazon] Retry %d/%d after %v...\n", attempt, amazonMaxRetries, delay)
+			time.Sleep(delay)
+		}

-	GoLog("[Amazon] Fetching from AfkarXYZ API...\n")
+		downloadURL, fileName, decryptionKey, err := a.doAfkarXYZRequest(amazonURL)
+		if err == nil {
+			return downloadURL, fileName, decryptionKey, nil
+		}

-	req, err := http.NewRequest("GET", apiURL, nil)
+		lastErr = err
+		errStr := strings.ToLower(err.Error())
+
+		// Check if error is retryable
+		isRetryable := strings.Contains(errStr, "timeout") ||
+			strings.Contains(errStr, "connection reset") ||
+			strings.Contains(errStr, "connection refused") ||
+			strings.Contains(errStr, "eof") ||
+			strings.Contains(errStr, "status 5") ||
+			strings.Contains(errStr, "status 429") ||
+			strings.Contains(errStr, "http 429")
+
+		if !isRetryable {
+			return "", "", "", err
+		}
+
+		GoLog("[Amazon] Attempt %d failed (retryable): %v\n", attempt+1, err)
+	}
+
+	return "", "", "", fmt.Errorf("all %d attempts failed: %w", amazonMaxRetries+1, lastErr)
+}
+
+func normalizeAmazonASIN(candidate string) string {
+	trimmed := strings.TrimSpace(candidate)
+	if trimmed == "" {
+		return ""
+	}
+
+	if decoded, err := url.QueryUnescape(trimmed); err == nil {
+		trimmed = decoded
+	}
+
+	trimmed = strings.ToUpper(trimmed)
+	if idx := strings.IndexAny(trimmed, "?#&/"); idx >= 0 {
+		trimmed = trimmed[:idx]
+	}
+
+	if amazonASINRegex.MatchString(trimmed) {
+		return trimmed
+	}
+
+	return ""
+}
+
+func extractAmazonASIN(amazonURL string) string {
+	raw := strings.TrimSpace(amazonURL)
+	if raw == "" {
+		return ""
+	}
+
+	parsed, err := url.Parse(raw)
+	if err == nil {
+		query := parsed.Query()
+
+		// Prefer track-level ASIN when URL also contains albumAsin.
+		for _, key := range []string{"trackAsin", "trackasin", "trackASIN", "asin", "ASIN", "i"} {
+			if asin := normalizeAmazonASIN(query.Get(key)); asin != "" {
+				return asin
+			}
+		}
+
+		path := strings.Trim(parsed.Path, "/")
+		if path != "" {
+			segments := strings.Split(path, "/")
+
+			for i := 0; i < len(segments)-1; i++ {
+				segment := strings.ToLower(strings.TrimSpace(segments[i]))
+				if segment == "track" || segment == "tracks" {
+					if asin := normalizeAmazonASIN(segments[i+1]); asin != "" {
+						return asin
+					}
+				}
+			}
+
+			if asin := normalizeAmazonASIN(segments[len(segments)-1]); asin != "" {
+				return asin
+			}
+		}
+	}
+
+	match := amazonASINFindRegex.FindString(strings.ToUpper(raw))
+	return normalizeAmazonASIN(match)
+}
+
+// doAfkarXYZRequest performs a single request to Amazon API.
+// It tries new endpoint first, then falls back to legacy /convert endpoint.
+func (a *AmazonDownloader) doAfkarXYZRequest(amazonURL string) (string, string, string, error) {
+	asin := extractAmazonASIN(amazonURL)
+	if asin != "" {
+		GoLog("[Amazon] Using ASIN: %s\n", asin)
+		downloadURL, fileName, decryptKey, err := a.doAfkarXYZRequestNew(asin)
+		if err == nil {
+			return downloadURL, fileName, decryptKey, nil
+		}
+		GoLog("[Amazon] New API failed for ASIN %s, trying legacy endpoint: %v\n", asin, err)
+	}
+	return a.doAfkarXYZRequestLegacy(amazonURL)
+}
+
+func (a *AmazonDownloader) doAfkarXYZRequestNew(asin string) (string, string, string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), amazonAPITimeoutMobile)
+	defer cancel()
+
+	apiURL := fmt.Sprintf("https://amazon.afkarxyz.fun/api/track/%s", asin)
+	req, err := http.NewRequestWithContext(ctx, "GET", apiURL, nil)
 	if err != nil {
-		return "", "", fmt.Errorf("failed to create request: %w", err)
+		return "", "", "", fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36")
+
+	resp, err := a.client.Do(req)
+	if err != nil {
+		return "", "", "", fmt.Errorf("failed to call Amazon API: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return "", "", "", fmt.Errorf("Amazon API returned status %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", "", "", fmt.Errorf("failed to read response: %w", err)
+	}
+
+	var apiResp AmazonStreamResponse
+	if err := json.Unmarshal(body, &apiResp); err != nil {
+		return "", "", "", fmt.Errorf("failed to decode response: %w", err)
+	}
+
+	if strings.TrimSpace(apiResp.StreamURL) == "" {
+		return "", "", "", fmt.Errorf("Amazon API returned empty stream URL")
+	}
+
+	fileName := asin + ".m4a"
+	return apiResp.StreamURL, fileName, strings.TrimSpace(apiResp.DecryptionKey), nil
+}
+
+func (a *AmazonDownloader) doAfkarXYZRequestLegacy(amazonURL string) (string, string, string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), amazonAPITimeoutMobile)
+	defer cancel()
+
+	apiURL := "https://amazon.afkarxyz.fun/convert?url=" + url.QueryEscape(amazonURL)
+	req, err := http.NewRequestWithContext(ctx, "GET", apiURL, nil)
+	if err != nil {
+		return "", "", "", fmt.Errorf("failed to create legacy request: %w", err)
 	}

 	req.Header.Set("User-Agent", getRandomUserAgent())

 	resp, err := a.client.Do(req)
 	if err != nil {
-		return "", "", fmt.Errorf("failed to call AfkarXYZ API: %w", err)
+		return "", "", "", fmt.Errorf("failed to call legacy AfkarXYZ API: %w", err)
 	}
 	defer resp.Body.Close()

 	if resp.StatusCode != 200 {
-		return "", "", fmt.Errorf("AfkarXYZ API returned status %d", resp.StatusCode)
+		return "", "", "", fmt.Errorf("legacy AfkarXYZ API returned status %d", resp.StatusCode)
 	}

 	body, err := io.ReadAll(resp.Body)
 	if err != nil {
-		return "", "", fmt.Errorf("failed to read response: %w", err)
+		return "", "", "", fmt.Errorf("failed to read legacy response: %w", err)
 	}

 	var apiResp AfkarXYZResponse
 	if err := json.Unmarshal(body, &apiResp); err != nil {
-		return "", "", fmt.Errorf("failed to decode response: %w", err)
+		return "", "", "", fmt.Errorf("failed to decode legacy response: %w", err)
 	}

-	if !apiResp.Success || apiResp.Data.DirectLink == "" {
-		return "", "", fmt.Errorf("AfkarXYZ API failed or no download link found")
+	if !apiResp.Success || strings.TrimSpace(apiResp.Data.DirectLink) == "" {
+		return "", "", "", fmt.Errorf("legacy AfkarXYZ API failed or no download link found")
 	}

 	fileName := apiResp.Data.FileName
@@ -98,12 +259,25 @@ func (a *AmazonDownloader) downloadFromAfkarXYZ(amazonURL string) (string, strin
 	reg := regexp.MustCompile(`[<>:"/\\|?*]`)
 	fileName = reg.ReplaceAllString(fileName, "")

-	GoLog("[Amazon] AfkarXYZ returned: %s (%.2f MB)\n", fileName, float64(apiResp.Data.FileSize)/(1024*1024))
-
-	return apiResp.Data.DirectLink, fileName, nil
+	return apiResp.Data.DirectLink, fileName, "", nil
 }

-func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath, itemID string) error {
+func (a *AmazonDownloader) downloadFromAfkarXYZ(amazonURL string) (string, string, string, error) {
+	GoLog("[Amazon] Fetching from AfkarXYZ API...\n")
+
+	downloadURL, fileName, decryptionKey, err := a.fetchAmazonURLWithRetry(amazonURL)
+	if err != nil {
+		return "", "", "", err
+	}
+
+	if decryptionKey != "" {
+		GoLog("[Amazon] AfkarXYZ returned encrypted stream (decryption key available)\n")
+	}
+	GoLog("[Amazon] AfkarXYZ returned: %s\n", fileName)
+	return downloadURL, fileName, decryptionKey, nil
+}
+
+func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath string, outputFD int, itemID string) error {
 	ctx := context.Background()

 	if itemID != "" {
@@ -142,7 +316,7 @@ func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath, itemID string)
 		SetItemBytesTotal(itemID, expectedSize)
 	}

-	out, err := os.Create(outputPath)
+	out, err := openOutputForWrite(outputPath, outputFD)
 	if err != nil {
 		return err
 	}
@@ -161,23 +335,23 @@ func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath, itemID string)
 	closeErr := out.Close()

 	if err != nil {
-		os.Remove(outputPath)
+		cleanupOutputOnError(outputPath, outputFD)
 		if isDownloadCancelled(itemID) {
 			return ErrDownloadCancelled
 		}
 		return fmt.Errorf("download interrupted: %w", err)
 	}
 	if flushErr != nil {
-		os.Remove(outputPath)
+		cleanupOutputOnError(outputPath, outputFD)
 		return fmt.Errorf("failed to flush buffer: %w", flushErr)
 	}
 	if closeErr != nil {
-		os.Remove(outputPath)
+		cleanupOutputOnError(outputPath, outputFD)
 		return fmt.Errorf("failed to close file: %w", closeErr)
 	}

 	if expectedSize > 0 && written != expectedSize {
-		os.Remove(outputPath)
+		cleanupOutputOnError(outputPath, outputFD)
 		return fmt.Errorf("incomplete download: expected %d bytes, got %d bytes", expectedSize, written)
 	}

@@ -187,54 +361,74 @@ func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath, itemID string)

 // AmazonDownloadResult contains download result with quality info
 type AmazonDownloadResult struct {
-	FilePath    string
-	BitDepth    int
-	SampleRate  int
-	Title       string
-	Artist      string
-	Album       string
-	ReleaseDate string
-	TrackNumber int
-	DiscNumber  int
-	ISRC        string
+	FilePath      string
+	BitDepth      int
+	SampleRate    int
+	Title         string
+	Artist        string
+	Album         string
+	ReleaseDate   string
+	TrackNumber   int
+	DiscNumber    int
+	ISRC          string
+	LyricsLRC     string
+	DecryptionKey string
 }

 func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	downloader := NewAmazonDownloader()

-	if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
-		return AmazonDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
+	isSafOutput := isFDOutput(req.OutputFD) || strings.TrimSpace(req.OutputPath) != ""
+	if !isSafOutput {
+		if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
+			return AmazonDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
+		}
+	}
+
+	amazonURL := ""
+	if req.ISRC != "" {
+		if cached := GetTrackIDCache().Get(req.ISRC); cached != nil && cached.AmazonURL != "" {
+			amazonURL = cached.AmazonURL
+			GoLog("[Amazon] Cache hit! Using cached Amazon URL for ISRC %s\n", req.ISRC)
+		}
 	}

 	songlink := NewSongLinkClient()
 	var availability *TrackAvailability
 	var err error

-	if deezerID, found := strings.CutPrefix(req.SpotifyID, "deezer:"); found {
-		GoLog("[Amazon] Using Deezer ID for SongLink lookup: %s\n", deezerID)
-		availability, err = songlink.CheckAvailabilityFromDeezer(deezerID)
-	} else if req.SpotifyID != "" {
-		availability, err = songlink.CheckTrackAvailability(req.SpotifyID, req.ISRC)
-	} else {
-		return AmazonDownloadResult{}, fmt.Errorf("no valid Spotify or Deezer ID provided for Amazon lookup")
+	if amazonURL == "" {
+		if deezerID, found := strings.CutPrefix(req.SpotifyID, "deezer:"); found {
+			GoLog("[Amazon] Using Deezer ID for SongLink lookup: %s\n", deezerID)
+			availability, err = songlink.CheckAvailabilityFromDeezer(deezerID)
+		} else if req.SpotifyID != "" {
+			availability, err = songlink.CheckTrackAvailability(req.SpotifyID, req.ISRC)
+		} else {
+			return AmazonDownloadResult{}, fmt.Errorf("no valid Spotify or Deezer ID provided for Amazon lookup")
+		}
+
+		if err != nil {
+			return AmazonDownloadResult{}, fmt.Errorf("failed to check Amazon availability via SongLink: %w", err)
+		}
+
+		if !availability.Amazon || availability.AmazonURL == "" {
+			return AmazonDownloadResult{}, fmt.Errorf("track not available on Amazon Music (SongLink returned no Amazon URL)")
+		}
+
+		amazonURL = availability.AmazonURL
+		if req.ISRC != "" {
+			GetTrackIDCache().SetAmazonURL(req.ISRC, amazonURL)
+		}
 	}

-	if err != nil {
-		return AmazonDownloadResult{}, fmt.Errorf("failed to check Amazon availability via SongLink: %w", err)
-	}
-
-	if !availability.Amazon || availability.AmazonURL == "" {
-		return AmazonDownloadResult{}, fmt.Errorf("track not available on Amazon Music (SongLink returned no Amazon URL)")
-	}
-
-	if req.OutputDir != "." {
+	if !isSafOutput && req.OutputDir != "." {
 		if err := os.MkdirAll(req.OutputDir, 0755); err != nil {
 			return AmazonDownloadResult{}, fmt.Errorf("failed to create output directory: %w", err)
 		}
 	}

 	// Download using AfkarXYZ API
-	downloadURL, _, err := downloader.downloadFromAfkarXYZ(availability.AmazonURL)
+	downloadURL, afkarFileName, decryptionKey, err := downloader.downloadFromAfkarXYZ(amazonURL)
 	if err != nil {
 		return AmazonDownloadResult{}, fmt.Errorf("failed to get download URL from AfkarXYZ: %w", err)
 	}
@@ -247,13 +441,25 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		"album":  req.AlbumName,
 		"track":  req.TrackNumber,
 		"year":   extractYear(req.ReleaseDate),
+		"date":   req.ReleaseDate,
 		"disc":   req.DiscNumber,
 	})
-	filename = sanitizeFilename(filename) + ".flac"
-	outputPath := filepath.Join(req.OutputDir, filename)
-
-	if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
-		return AmazonDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
+	var outputPath string
+	if isSafOutput {
+		outputPath = strings.TrimSpace(req.OutputPath)
+		if outputPath == "" && isFDOutput(req.OutputFD) {
+			outputPath = fmt.Sprintf("/proc/self/fd/%d", req.OutputFD)
+		}
+	} else {
+		outputExt := strings.ToLower(filepath.Ext(afkarFileName))
+		if outputExt == "" {
+			outputExt = ".flac"
+		}
+		filename = sanitizeFilename(filename) + outputExt
+		outputPath = filepath.Join(req.OutputDir, filename)
+		if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
+			return AmazonDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
+		}
 	}

 	// START PARALLEL: Fetch cover and lyrics while downloading audio
@@ -273,13 +479,19 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	}()

 	// Download audio file with item ID for progress tracking
-	if err := downloader.DownloadFile(downloadURL, outputPath, req.ItemID); err != nil {
+	if err := downloader.DownloadFile(downloadURL, outputPath, req.OutputFD, req.ItemID); err != nil {
 		if errors.Is(err, ErrDownloadCancelled) {
 			return AmazonDownloadResult{}, ErrDownloadCancelled
 		}
 		return AmazonDownloadResult{}, fmt.Errorf("download failed: %w", err)
 	}

+	actualOutputPath := outputPath
+	needsDecryption := strings.TrimSpace(decryptionKey) != ""
+	if needsDecryption {
+		GoLog("[Amazon] Download requires decryption; deferring decrypt to Flutter FFmpeg path\n")
+	}
+
 	// Wait for parallel operations to complete
 	<-parallelDone

@@ -288,7 +500,6 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		SetItemFinalizing(req.ItemID)
 	}

-	existingMeta, metaErr := ReadMetadata(outputPath)
 	actualTrackNum := req.TrackNumber
 	actualDiscNum := req.DiscNumber
 	actualDate := req.ReleaseDate
@@ -296,25 +507,28 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	actualTitle := req.TrackName
 	actualArtist := req.ArtistName

-	if metaErr == nil && existingMeta != nil {
-		if existingMeta.TrackNumber > 0 && (req.TrackNumber == 0 || req.TrackNumber == 1) {
-			actualTrackNum = existingMeta.TrackNumber
-			GoLog("[Amazon] Using track number from file: %d (request had: %d)\n", actualTrackNum, req.TrackNumber)
+	if !needsDecryption {
+		existingMeta, metaErr := ReadMetadata(actualOutputPath)
+		if metaErr == nil && existingMeta != nil {
+			if existingMeta.TrackNumber > 0 && (req.TrackNumber == 0 || req.TrackNumber == 1) {
+				actualTrackNum = existingMeta.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
+				GoLog("[Amazon] Using disc number from file: %d (request had: %d)\n", actualDiscNum, req.DiscNumber)
+			}
+			if existingMeta.Date != "" && req.ReleaseDate == "" {
+				actualDate = existingMeta.Date
+				GoLog("[Amazon] Using release date from file: %s\n", actualDate)
+			}
+			if existingMeta.Album != "" && req.AlbumName == "" {
+				actualAlbum = existingMeta.Album
+				GoLog("[Amazon] Using album from file: %s\n", actualAlbum)
+			}
+			GoLog("[Amazon] Existing metadata - Title: %s, Artist: %s, Album: %s, Date: %s\n",
+				existingMeta.Title, existingMeta.Artist, existingMeta.Album, existingMeta.Date)
 		}
-		if existingMeta.DiscNumber > 0 && (req.DiscNumber == 0 || req.DiscNumber == 1) {
-			actualDiscNum = existingMeta.DiscNumber
-			GoLog("[Amazon] Using disc number from file: %d (request had: %d)\n", actualDiscNum, req.DiscNumber)
-		}
-		if existingMeta.Date != "" && req.ReleaseDate == "" {
-			actualDate = existingMeta.Date
-			GoLog("[Amazon] Using release date from file: %s\n", actualDate)
-		}
-		if existingMeta.Album != "" && req.AlbumName == "" {
-			actualAlbum = existingMeta.Album
-			GoLog("[Amazon] Using album from file: %s\n", actualAlbum)
-		}
-		GoLog("[Amazon] Existing metadata - Title: %s, Artist: %s, Album: %s, Date: %s\n",
-			existingMeta.Title, existingMeta.Artist, existingMeta.Album, existingMeta.Date)
 	}

 	metadata := Metadata{
@@ -337,7 +551,7 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		coverData = parallelResult.CoverData
 		GoLog("[Amazon] Using parallel-fetched cover (%d bytes)\n", len(coverData))
 	} else {
-		existingCover, coverErr := ExtractCoverArt(outputPath)
+		existingCover, coverErr := ExtractCoverArt(actualOutputPath)
 		if coverErr == nil && len(existingCover) > 0 {
 			coverData = existingCover
 			GoLog("[Amazon] Using existing cover from Amazon file (%d bytes)\n", len(coverData))
@@ -346,59 +560,78 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		}
 	}

-	if err := EmbedMetadataWithCoverData(outputPath, metadata, coverData); err != nil {
-		GoLog("[Amazon] Warning: failed to embed metadata: %v\n", err)
-	}
-
-	if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
-		lyricsMode := req.LyricsMode
-		if lyricsMode == "" {
-			lyricsMode = "embed"
-		}
-
-		if lyricsMode == "external" || lyricsMode == "both" {
-			GoLog("[Amazon] Saving external LRC file...\n")
-			if lrcPath, lrcErr := SaveLRCFile(outputPath, parallelResult.LyricsLRC); lrcErr != nil {
-				GoLog("[Amazon] Warning: failed to save LRC file: %v\n", lrcErr)
-			} else {
-				GoLog("[Amazon] LRC file saved: %s\n", lrcPath)
+	if isSafOutput || needsDecryption {
+		GoLog("[Amazon] SAF output detected - skipping in-backend metadata/lyrics embedding (handled in Flutter)\n")
+	} else {
+		isFlacOutput := strings.HasSuffix(strings.ToLower(actualOutputPath), ".flac")
+		if isFlacOutput {
+			if err := EmbedMetadataWithCoverData(actualOutputPath, metadata, coverData); err != nil {
+				GoLog("[Amazon] Warning: failed to embed metadata: %v\n", err)
 			}
+		} else {
+			GoLog("[Amazon] Non-FLAC output detected (%s), skipping native metadata embedding\n", filepath.Ext(actualOutputPath))
 		}

-		if lyricsMode == "embed" || lyricsMode == "both" {
-			GoLog("[Amazon] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
-			if embedErr := EmbedLyrics(outputPath, parallelResult.LyricsLRC); embedErr != nil {
-				GoLog("[Amazon] Warning: failed to embed lyrics: %v\n", embedErr)
-			} else {
-				GoLog("[Amazon] Lyrics embedded successfully\n")
+		if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
+			lyricsMode := req.LyricsMode
+			if lyricsMode == "" {
+				lyricsMode = "embed"
 			}
+
+			if lyricsMode == "external" || lyricsMode == "both" {
+				GoLog("[Amazon] Saving external LRC file...\n")
+				if lrcPath, lrcErr := SaveLRCFile(actualOutputPath, parallelResult.LyricsLRC); lrcErr != nil {
+					GoLog("[Amazon] Warning: failed to save LRC file: %v\n", lrcErr)
+				} else {
+					GoLog("[Amazon] LRC file saved: %s\n", lrcPath)
+				}
+			}
+
+			if (lyricsMode == "embed" || lyricsMode == "both") && isFlacOutput {
+				GoLog("[Amazon] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
+				if embedErr := EmbedLyrics(actualOutputPath, parallelResult.LyricsLRC); embedErr != nil {
+					GoLog("[Amazon] Warning: failed to embed lyrics: %v\n", embedErr)
+				} else {
+					GoLog("[Amazon] Lyrics embedded successfully\n")
+				}
+			} else if (lyricsMode == "embed" || lyricsMode == "both") && !isFlacOutput {
+				GoLog("[Amazon] Skipping embedded lyrics for non-FLAC output\n")
+			}
+		} else if req.EmbedLyrics {
+			GoLog("[Amazon] No lyrics available from parallel fetch\n")
 		}
-	} else if req.EmbedLyrics {
-		GoLog("[Amazon] No lyrics available from parallel fetch\n")
 	}

 	GoLog("[Amazon] Downloaded successfully from Amazon Music\n")

-	quality, err := GetAudioQuality(outputPath)
-	if err != nil {
-		GoLog("[Amazon] Warning: couldn't read quality from file: %v\n", err)
+	quality := AudioQuality{}
+	if isSafOutput || needsDecryption {
+		GoLog("[Amazon] SAF output detected - skipping post-write file inspection in backend\n")
 	} else {
-		GoLog("[Amazon] Actual quality: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
-	}
+		quality, err = GetAudioQuality(actualOutputPath)
+		if err != nil {
+			GoLog("[Amazon] Warning: couldn't read quality from file: %v\n", err)
+		} else {
+			GoLog("[Amazon] Actual quality: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
+		}

-	finalMeta, metaReadErr := ReadMetadata(outputPath)
-	if metaReadErr == nil && finalMeta != nil {
-		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
-		if finalMeta.Date != "" {
-			req.ReleaseDate = finalMeta.Date
+		finalMeta, metaReadErr := ReadMetadata(actualOutputPath)
+		if metaReadErr == nil && finalMeta != nil {
+			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
+			if finalMeta.Date != "" {
+				req.ReleaseDate = finalMeta.Date
+			}
 		}
 	}

-	// Add to ISRC index for fast duplicate checking
-	AddToISRCIndex(req.OutputDir, req.ISRC, outputPath)
+	// Add to ISRC index for fast duplicate checking.
+	// When decryption is pending in Flutter, postpone indexing until final file is settled.
+	if !isSafOutput && !needsDecryption {
+		AddToISRCIndex(req.OutputDir, req.ISRC, actualOutputPath)
+	}

 	bitDepth := 0
 	sampleRate := 0
@@ -407,16 +640,23 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		sampleRate = quality.SampleRate
 	}

+	lyricsLRC := ""
+	if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
+		lyricsLRC = parallelResult.LyricsLRC
+	}
+
 	return AmazonDownloadResult{
-		FilePath:    outputPath,
-		BitDepth:    bitDepth,
-		SampleRate:  sampleRate,
-		Title:       req.TrackName,
-		Artist:      req.ArtistName,
-		Album:       req.AlbumName,
-		ReleaseDate: req.ReleaseDate,
-		TrackNumber: actualTrackNum,
-		DiscNumber:  actualDiscNum,
-		ISRC:        req.ISRC,
+		FilePath:      outputPath,
+		BitDepth:      bitDepth,
+		SampleRate:    sampleRate,
+		Title:         req.TrackName,
+		Artist:        req.ArtistName,
+		Album:         req.AlbumName,
+		ReleaseDate:   req.ReleaseDate,
+		TrackNumber:   actualTrackNum,
+		DiscNumber:    actualDiscNum,
+		ISRC:          req.ISRC,
+		LyricsLRC:     lyricsLRC,
+		DecryptionKey: decryptionKey,
 	}, nil
 }
@@ -0,0 +1,46 @@
+package gobackend
+
+import "testing"
+
+func TestExtractAmazonASIN(t *testing.T) {
+	tests := []struct {
+		name string
+		url  string
+		want string
+	}{
+		{
+			name: "prefers trackAsin over albumAsin",
+			url:  "https://music.amazon.com/albums/B0ALBUM123?trackAsin=B0TRACK456&musicTerritory=US",
+			want: "B0TRACK456",
+		},
+		{
+			name: "extract from tracks path",
+			url:  "https://music.amazon.com/tracks/B0CYQHGWZJ?musicTerritory=US",
+			want: "B0CYQHGWZJ",
+		},
+		{
+			name: "extract from plain query asin",
+			url:  "https://example.com/?asin=B0CYQHGWZJ",
+			want: "B0CYQHGWZJ",
+		},
+		{
+			name: "fallback regex",
+			url:  "https://example.com/path/B0CYQHGWZJ",
+			want: "B0CYQHGWZJ",
+		},
+		{
+			name: "invalid url",
+			url:  "https://music.amazon.com/tracks/not-valid",
+			want: "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := extractAmazonASIN(tt.url)
+			if got != tt.want {
+				t.Fatalf("extractAmazonASIN() = %q, want %q", got, tt.want)
+			}
+		})
+	}
+}
@@ -23,15 +23,28 @@ const (
 	deezerCacheTTL = 10 * time.Minute

 	deezerMaxParallelISRC = 10
+
+	// Deezer API timeout and retry configuration for mobile networks
+	deezerAPITimeoutMobile = 25 * time.Second
+	deezerMaxRetries       = 2
+	deezerRetryDelay       = 500 * time.Millisecond
+
+	deezerMaxSearchCacheEntries = 300
+	deezerMaxAlbumCacheEntries  = 200
+	deezerMaxArtistCacheEntries = 200
+	deezerMaxISRCCacheEntries   = 4000
+	deezerCacheCleanupInterval  = 5 * time.Minute
 )

 type DeezerClient struct {
-	httpClient  *http.Client
-	searchCache map[string]*cacheEntry
-	albumCache  map[string]*cacheEntry
-	artistCache map[string]*cacheEntry
-	isrcCache   map[string]string
-	cacheMu     sync.RWMutex
+	httpClient           *http.Client
+	searchCache          map[string]*cacheEntry
+	albumCache           map[string]*cacheEntry
+	artistCache          map[string]*cacheEntry
+	isrcCache            map[string]string
+	cacheMu              sync.RWMutex
+	lastCacheCleanup     time.Time
+	cacheCleanupInterval time.Duration
 }

 var (
@@ -42,16 +55,111 @@ var (
 func GetDeezerClient() *DeezerClient {
 	deezerClientOnce.Do(func() {
 		deezerClient = &DeezerClient{
-			httpClient:  NewHTTPClientWithTimeout(15 * time.Second),
-			searchCache: make(map[string]*cacheEntry),
-			albumCache:  make(map[string]*cacheEntry),
-			artistCache: make(map[string]*cacheEntry),
-			isrcCache:   make(map[string]string),
+			httpClient:           NewMetadataHTTPClient(deezerAPITimeoutMobile),
+			searchCache:          make(map[string]*cacheEntry),
+			albumCache:           make(map[string]*cacheEntry),
+			artistCache:          make(map[string]*cacheEntry),
+			isrcCache:            make(map[string]string),
+			cacheCleanupInterval: deezerCacheCleanupInterval,
 		}
 	})
 	return deezerClient
 }

+func (c *DeezerClient) pruneExpiredCacheEntriesLocked(
+	cache map[string]*cacheEntry,
+	now time.Time,
+) {
+	for key, entry := range cache {
+		if entry == nil || now.After(entry.expiresAt) {
+			delete(cache, key)
+		}
+	}
+}
+
+func (c *DeezerClient) trimCacheEntriesLocked(
+	cache map[string]*cacheEntry,
+	maxEntries int,
+) {
+	if maxEntries <= 0 || len(cache) <= maxEntries {
+		return
+	}
+
+	for len(cache) > maxEntries {
+		var oldestKey string
+		var oldestExpiry time.Time
+		first := true
+		for key, entry := range cache {
+			expiry := time.Time{}
+			if entry != nil {
+				expiry = entry.expiresAt
+			}
+			if first || expiry.Before(oldestExpiry) {
+				first = false
+				oldestKey = key
+				oldestExpiry = expiry
+			}
+		}
+		if oldestKey == "" {
+			return
+		}
+		delete(cache, oldestKey)
+	}
+}
+
+func (c *DeezerClient) trimStringCacheEntriesLocked(
+	cache map[string]string,
+	maxEntries int,
+) {
+	if maxEntries <= 0 || len(cache) <= maxEntries {
+		return
+	}
+
+	toRemove := len(cache) - maxEntries
+	for key := range cache {
+		delete(cache, key)
+		toRemove--
+		if toRemove <= 0 {
+			return
+		}
+	}
+}
+
+func (c *DeezerClient) maybeCleanupCachesLocked(now time.Time) {
+	periodicCleanupDue := c.cacheCleanupInterval > 0 &&
+		(c.lastCacheCleanup.IsZero() ||
+			now.Sub(c.lastCacheCleanup) >= c.cacheCleanupInterval)
+
+	if periodicCleanupDue {
+		c.pruneExpiredCacheEntriesLocked(c.searchCache, now)
+		c.pruneExpiredCacheEntriesLocked(c.albumCache, now)
+		c.pruneExpiredCacheEntriesLocked(c.artistCache, now)
+		c.lastCacheCleanup = now
+	}
+
+	if len(c.searchCache) > deezerMaxSearchCacheEntries {
+		if !periodicCleanupDue {
+			c.pruneExpiredCacheEntriesLocked(c.searchCache, now)
+		}
+		c.trimCacheEntriesLocked(c.searchCache, deezerMaxSearchCacheEntries)
+	}
+	if len(c.albumCache) > deezerMaxAlbumCacheEntries {
+		if !periodicCleanupDue {
+			c.pruneExpiredCacheEntriesLocked(c.albumCache, now)
+		}
+		c.trimCacheEntriesLocked(c.albumCache, deezerMaxAlbumCacheEntries)
+	}
+	if len(c.artistCache) > deezerMaxArtistCacheEntries {
+		if !periodicCleanupDue {
+			c.pruneExpiredCacheEntriesLocked(c.artistCache, now)
+		}
+		c.trimCacheEntriesLocked(c.artistCache, deezerMaxArtistCacheEntries)
+	}
+	if len(c.isrcCache) > deezerMaxISRCCacheEntries {
+		c.trimStringCacheEntriesLocked(c.isrcCache, deezerMaxISRCCacheEntries)
+	}
+}
+
 type deezerTrack struct {
 	ID            int64             `json:"id"`
 	Title         string            `json:"title"`
@@ -409,10 +517,12 @@ func (c *DeezerClient) SearchAll(ctx context.Context, query string, trackLimit,
 	GoLog("[Deezer] SearchAll complete: %d tracks, %d artists, %d albums, %d playlists\n", len(result.Tracks), len(result.Artists), len(result.Albums), len(result.Playlists))

 	c.cacheMu.Lock()
+	now := time.Now()
 	c.searchCache[cacheKey] = &cacheEntry{
 		data:      result,
-		expiresAt: time.Now().Add(deezerCacheTTL),
+		expiresAt: now.Add(deezerCacheTTL),
 	}
+	c.maybeCleanupCachesLocked(now)
 	c.cacheMu.Unlock()

 	return result, nil
@@ -550,10 +660,12 @@ func (c *DeezerClient) GetAlbum(ctx context.Context, albumID string) (*AlbumResp
 	}

 	c.cacheMu.Lock()
+	now := time.Now()
 	c.albumCache[albumID] = &cacheEntry{
 		data:      result,
-		expiresAt: time.Now().Add(deezerCacheTTL),
+		expiresAt: now.Add(deezerCacheTTL),
 	}
+	c.maybeCleanupCachesLocked(now)
 	c.cacheMu.Unlock()

 	return result, nil
@@ -633,10 +745,12 @@ func (c *DeezerClient) GetArtist(ctx context.Context, artistID string) (*ArtistR
 	}

 	c.cacheMu.Lock()
+	now := time.Now()
 	c.artistCache[artistID] = &cacheEntry{
 		data:      result,
-		expiresAt: time.Now().Add(deezerCacheTTL),
+		expiresAt: now.Add(deezerCacheTTL),
 	}
+	c.maybeCleanupCachesLocked(now)
 	c.cacheMu.Unlock()

 	return result, nil
@@ -802,6 +916,7 @@ func (c *DeezerClient) fetchISRCsParallel(ctx context.Context, tracks []deezerTr
 		for trackIDStr, isrc := range directISRCs {
 			c.isrcCache[trackIDStr] = isrc
 		}
+		c.maybeCleanupCachesLocked(time.Now())
 		c.cacheMu.Unlock()
 	}

@@ -836,6 +951,7 @@ func (c *DeezerClient) fetchISRCsParallel(ctx context.Context, tracks []deezerTr

 			c.cacheMu.Lock()
 			c.isrcCache[trackIDStr] = fullTrack.ISRC
+			c.maybeCleanupCachesLocked(time.Now())
 			c.cacheMu.Unlock()
 		}(track)
 	}
@@ -859,6 +975,7 @@ func (c *DeezerClient) GetTrackISRC(ctx context.Context, trackID string) (string

 	c.cacheMu.Lock()
 	c.isrcCache[trackID] = fullTrack.ISRC
+	c.maybeCleanupCachesLocked(time.Now())
 	c.cacheMu.Unlock()

 	return fullTrack.ISRC, nil
@@ -941,10 +1058,12 @@ func (c *DeezerClient) GetAlbumExtendedMetadata(ctx context.Context, albumID str
 	}

 	c.cacheMu.Lock()
+	now := time.Now()
 	c.searchCache[cacheKey] = &cacheEntry{
 		data:      result,
-		expiresAt: time.Now().Add(deezerCacheTTL),
+		expiresAt: now.Add(deezerCacheTTL),
 	}
+	c.maybeCleanupCachesLocked(now)
 	c.cacheMu.Unlock()

 	GoLog("[Deezer] Album metadata fetched - Genre: %s, Label: %s\n", result.Genre, result.Label)
@@ -992,6 +1111,42 @@ func (c *DeezerClient) GetExtendedMetadataByISRC(ctx context.Context, isrc strin
 }

 func (c *DeezerClient) getJSON(ctx context.Context, endpoint string, dst interface{}) error {
+	var lastErr error
+
+	for attempt := 0; attempt <= deezerMaxRetries; attempt++ {
+		if attempt > 0 {
+			delay := deezerRetryDelay * time.Duration(1<<(attempt-1)) // Exponential backoff
+			GoLog("[Deezer] Retry %d/%d after %v...\n", attempt, deezerMaxRetries, delay)
+			time.Sleep(delay)
+		}
+
+		err := c.doGetJSON(ctx, endpoint, dst)
+		if err == nil {
+			return nil
+		}
+
+		lastErr = err
+		errStr := err.Error()
+
+		// Check if error is retryable
+		isRetryable := strings.Contains(errStr, "timeout") ||
+			strings.Contains(errStr, "connection reset") ||
+			strings.Contains(errStr, "connection refused") ||
+			strings.Contains(errStr, "EOF") ||
+			strings.Contains(errStr, "status 5") ||
+			strings.Contains(errStr, "status 429")
+
+		if !isRetryable {
+			return err
+		}
+
+		GoLog("[Deezer] Attempt %d failed (retryable): %v\n", attempt+1, err)
+	}
+
+	return fmt.Errorf("all %d attempts failed: %w", deezerMaxRetries+1, lastErr)
+}
+
+func (c *DeezerClient) doGetJSON(ctx context.Context, endpoint string, dst interface{}) error {
 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
 	if err != nil {
 		return err
@@ -47,7 +47,7 @@ type LoadedExtension struct {
 	ID        string             `json:"id"`
 	Manifest  *ExtensionManifest `json:"manifest"`
 	VM        *goja.Runtime      `json:"-"`
-	VMMu      sync.Mutex         `json:"-"` // Mutex to prevent concurrent VM access
+	VMMu      sync.Mutex         `json:"-"`
 	Enabled   bool               `json:"enabled"`
 	Error     string             `json:"error,omitempty"`
 	DataDir   string             `json:"data_dir"`
@@ -58,8 +58,8 @@ type LoadedExtension struct {
 type ExtensionManager struct {
 	mu            sync.RWMutex
 	extensions    map[string]*LoadedExtension
-	extensionsDir string // Base directory for extensions
-	dataDir       string // Base directory for extension data
+	extensionsDir string
+	dataDir       string
 }

 var (
@@ -98,7 +98,6 @@ func (m *ExtensionManager) LoadExtensionFromFile(filePath string) (*LoadedExtens
 		return nil, fmt.Errorf("Invalid file format. Please select a .spotiflac-ext file")
 	}

-	// Open the zip file
 	zipReader, err := zip.OpenReader(filePath)
 	if err != nil {
 		return nil, fmt.Errorf("Cannot open extension file. The file may be corrupted or not a valid extension package")
@@ -221,7 +220,6 @@ func (m *ExtensionManager) LoadExtensionFromFile(filePath string) (*LoadedExtens
 		SourceDir: extDir,
 	}

-	// Initialize Goja VM
 	if err := m.initializeVM(ext); err != nil {
 		ext.Error = err.Error()
 		ext.Enabled = false
@@ -268,13 +266,11 @@ func (m *ExtensionManager) initializeVM(ext *LoadedExtension) error {
 		return goja.Undefined()
 	})

-	// Run the extension code
 	_, err = vm.RunString(string(jsCode))
 	if err != nil {
 		return fmt.Errorf("failed to execute extension code: %w", err)
 	}

-	// Verify extension was registered
 	if registeredExtension == nil || goja.IsUndefined(registeredExtension) {
 		return fmt.Errorf("extension did not call registerExtension()")
 	}
@@ -291,9 +287,7 @@ func (m *ExtensionManager) UnloadExtension(extensionID string) error {
 		return fmt.Errorf("Extension not found")
 	}

-	// Call cleanup if VM is initialized
 	if ext.VM != nil {
-		// Try to call cleanup function
 		cleanup, err := ext.VM.RunString("typeof extension !== 'undefined' && typeof extension.cleanup === 'function' ? extension.cleanup() : null")
 		if err != nil {
 			GoLog("[Extension] Error calling cleanup for %s: %v\n", extensionID, err)
@@ -302,7 +296,6 @@ func (m *ExtensionManager) UnloadExtension(extensionID string) error {
 		}
 	}

-	// Remove from registry
 	delete(m.extensions, extensionID)
 	GoLog("[Extension] Unloaded extension: %s\n", extensionID)

@@ -343,7 +336,6 @@ func (m *ExtensionManager) SetExtensionEnabled(extensionID string, enabled bool)
 	ext.Enabled = enabled
 	GoLog("[Extension] %s %s\n", extensionID, map[bool]string{true: "enabled", false: "disabled"}[enabled])

-	// Persist enabled state to settings store
 	store := GetExtensionSettingsStore()
 	if err := store.Set(extensionID, "_enabled", enabled); err != nil {
 		GoLog("[Extension] Failed to persist enabled state for %s: %v\n", extensionID, err)
@@ -438,7 +430,6 @@ func (m *ExtensionManager) loadExtensionFromDirectory(dirPath string) (*LoadedEx
 		}
 	}

-	// Initialize Goja VM
 	if err := m.initializeVM(ext); err != nil {
 		ext.Error = err.Error()
 		ext.Enabled = false
@@ -457,12 +448,10 @@ func (m *ExtensionManager) RemoveExtension(extensionID string) error {
 		return err
 	}

-	// Unload first
 	if err := m.UnloadExtension(extensionID); err != nil {
 		return err
 	}

-	// Remove source directory
 	if ext.SourceDir != "" {
 		if err := os.RemoveAll(ext.SourceDir); err != nil {
 			GoLog("[Extension] Warning: failed to remove source dir: %v\n", err)
@@ -484,7 +473,6 @@ func (m *ExtensionManager) UpgradeExtension(filePath string) (*LoadedExtension,
 		return nil, fmt.Errorf("Invalid file format. Please select a .spotiflac-ext file")
 	}

-	// Open the zip file
 	zipReader, err := zip.OpenReader(filePath)
 	if err != nil {
 		return nil, fmt.Errorf("Cannot open extension file. The file may be corrupted or not a valid extension package")
@@ -548,11 +536,9 @@ func (m *ExtensionManager) UpgradeExtension(filePath string) (*LoadedExtension,
 	extDir := existing.SourceDir
 	wasEnabled := existing.Enabled

-	// Cleanup and unload existing extension
 	m.CleanupExtension(existing.ID)
 	m.UnloadExtension(existing.ID)

-	// Remove old source files but keep data directory
 	if extDir != "" {
 		if err := os.RemoveAll(extDir); err != nil {
 			GoLog("[Extension] Warning: failed to remove old source dir: %v\n", err)
@@ -634,11 +620,11 @@ type ExtensionUpgradeInfo struct {
 func (m *ExtensionManager) checkExtensionUpgradeInternal(filePath string) (*ExtensionUpgradeInfo, error) {
 	// Validate file extension
 	if !strings.HasSuffix(strings.ToLower(filePath), ".spotiflac-ext") {
-		return nil, fmt.Errorf("Invalid file format")
+		return nil, fmt.Errorf("Invalid file format. Please select a .spotiflac-ext file")
 	}

-	// Open the zip file
 	zipReader, err := zip.OpenReader(filePath)
+
 	if err != nil {
 		return nil, fmt.Errorf("Cannot open extension file")
 	}
@@ -727,6 +713,7 @@ func (m *ExtensionManager) GetInstalledExtensionsJSON() (string, error) {
 		Permissions            []string               `json:"permissions"`
 		HasMetadataProvider    bool                   `json:"has_metadata_provider"`
 		HasDownloadProvider    bool                   `json:"has_download_provider"`
+		HasLyricsProvider      bool                   `json:"has_lyrics_provider"`
 		SkipMetadataEnrichment bool                   `json:"skip_metadata_enrichment"`
 		SearchBehavior         *SearchBehaviorConfig  `json:"search_behavior,omitempty"`
 		TrackMatching          *TrackMatchingConfig   `json:"track_matching,omitempty"`
@@ -784,6 +771,7 @@ func (m *ExtensionManager) GetInstalledExtensionsJSON() (string, error) {
 			Permissions:            permissions,
 			HasMetadataProvider:    ext.Manifest.IsMetadataProvider(),
 			HasDownloadProvider:    ext.Manifest.IsDownloadProvider(),
+			HasLyricsProvider:      ext.Manifest.IsLyricsProvider(),
 			SkipMetadataEnrichment: ext.Manifest.SkipMetadataEnrichment,
 			SearchBehavior:         ext.Manifest.SearchBehavior,
 			TrackMatching:          ext.Manifest.TrackMatching,
@@ -12,6 +12,7 @@ type ExtensionType string
 const (
 	ExtensionTypeMetadataProvider ExtensionType = "metadata_provider"
 	ExtensionTypeDownloadProvider ExtensionType = "download_provider"
+	ExtensionTypeLyricsProvider   ExtensionType = "lyrics_provider"
 )

 type SettingType string
@@ -167,15 +168,14 @@ func (m *ExtensionManifest) Validate() error {
 	}

 	for _, t := range m.Types {
-		if t != ExtensionTypeMetadataProvider && t != ExtensionTypeDownloadProvider {
+		if t != ExtensionTypeMetadataProvider && t != ExtensionTypeDownloadProvider && t != ExtensionTypeLyricsProvider {
 			return &ManifestValidationError{
 				Field:   "type",
-				Message: fmt.Sprintf("invalid extension type: %s (must be 'metadata_provider' or 'download_provider')", t),
+				Message: fmt.Sprintf("invalid extension type: %s (must be 'metadata_provider', 'download_provider', or 'lyrics_provider')", t),
 			}
 		}
 	}

-	// Validate settings if present
 	for i, setting := range m.Settings {
 		if strings.TrimSpace(setting.Key) == "" {
 			return &ManifestValidationError{
@@ -227,6 +227,10 @@ func (m *ExtensionManifest) IsDownloadProvider() bool {
 	return m.HasType(ExtensionTypeDownloadProvider)
 }

+func (m *ExtensionManifest) IsLyricsProvider() bool {
+	return m.HasType(ExtensionTypeLyricsProvider)
+}
+
 func (m *ExtensionManifest) IsDomainAllowed(domain string) bool {
 	domain = strings.ToLower(strings.TrimSpace(domain))
 	for _, allowed := range m.Permissions.Network {
@@ -236,7 +240,7 @@ func (m *ExtensionManifest) IsDomainAllowed(domain string) bool {
 		}
 		// Support wildcard subdomains (e.g., *.example.com)
 		if strings.HasPrefix(allowed, "*.") {
-			suffix := allowed[1:] // Remove the *
+			suffix := allowed[1:]
 			if strings.HasSuffix(domain, suffix) {
 				return true
 			}
@@ -269,7 +273,6 @@ func (m *ExtensionManifest) MatchesURL(urlStr string) bool {
 	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
 		}
@@ -1,8 +1,11 @@
 package gobackend

 import (
+	"fmt"
+	"net"
 	"net/http"
 	"net/url"
+	"strings"
 	"sync"
 	"time"

@@ -103,8 +106,16 @@ func NewExtensionRuntime(ext *LoadedExtension) *ExtensionRuntime {
 		Timeout: 30 * time.Second,
 		Jar:     jar,
 		CheckRedirect: func(req *http.Request, via []*http.Request) error {
-			// Validate redirect target domain against allowed domains
+			if req.URL.Scheme != "https" {
+				GoLog("[Extension:%s] Redirect blocked: non-https scheme '%s'\n", ext.ID, req.URL.Scheme)
+				return fmt.Errorf("redirect blocked: only https is allowed")
+			}
+
 			domain := req.URL.Hostname()
+			if domain == "" {
+				GoLog("[Extension:%s] Redirect blocked: missing hostname\n", ext.ID)
+				return fmt.Errorf("redirect blocked: hostname is required")
+			}
 			if !ext.Manifest.IsDomainAllowed(domain) {
 				GoLog("[Extension:%s] Redirect blocked: domain '%s' not in allowed list\n", ext.ID, domain)
 				return &RedirectBlockedError{Domain: domain}
@@ -113,7 +124,6 @@ func NewExtensionRuntime(ext *LoadedExtension) *ExtensionRuntime {
 				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
 			}
@@ -139,35 +149,48 @@ func (e *RedirectBlockedError) Error() string {

 // 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.",
-		"::1",
-		"fc00:",
-		"fe80:",
+	hostLower := strings.ToLower(strings.TrimSpace(host))
+	if hostLower == "" {
+		return false
 	}

-	hostLower := host
-	for _, pattern := range privatePatterns {
-		if hostLower == pattern || len(hostLower) > len(pattern) && hostLower[:len(pattern)] == pattern {
+	if hostLower == "localhost" || strings.HasSuffix(hostLower, ".local") {
+		return true
+	}
+
+	if ip := net.ParseIP(hostLower); ip != nil {
+		return isPrivateIPAddr(ip)
+	}
+
+	ips, err := net.LookupIP(hostLower)
+	if err != nil {
+		return false
+	}
+
+	for _, ip := range ips {
+		if isPrivateIPAddr(ip) {
 			return true
 		}
 	}

-	// Also block .local domains
-	if len(host) > 6 && host[len(host)-6:] == ".local" {
+	return false
+}
+
+func isPrivateIPAddr(ip net.IP) bool {
+	if ip == nil {
+		return false
+	}
+	if ip.IsLoopback() ||
+		ip.IsPrivate() ||
+		ip.IsLinkLocalUnicast() ||
+		ip.IsLinkLocalMulticast() ||
+		ip.IsMulticast() ||
+		ip.IsUnspecified() {
+		return true
+	}
+	if !ip.IsGlobalUnicast() {
 		return true
 	}
-
 	return false
 }

@@ -202,7 +225,6 @@ func (r *ExtensionRuntime) SetSettings(settings map[string]interface{}) {
 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)
@@ -239,7 +261,6 @@ func (r *ExtensionRuntime) RegisterAPIs(vm *goja.Runtime) {
 	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)
@@ -257,7 +278,6 @@ func (r *ExtensionRuntime) RegisterAPIs(vm *goja.Runtime) {
 	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)
@@ -18,6 +18,43 @@ import (

 // ==================== Auth API (OAuth Support) ====================

+func validateExtensionAuthURL(urlStr string) error {
+	parsed, err := url.Parse(urlStr)
+	if err != nil {
+		return fmt.Errorf("invalid auth URL: %w", err)
+	}
+
+	if parsed.Scheme != "https" {
+		return fmt.Errorf("invalid auth URL: only https is allowed")
+	}
+
+	host := parsed.Hostname()
+	if host == "" {
+		return fmt.Errorf("invalid auth URL: hostname is required")
+	}
+
+	if parsed.User != nil {
+		return fmt.Errorf("invalid auth URL: embedded credentials are not allowed")
+	}
+
+	if isPrivateIP(host) {
+		return fmt.Errorf("invalid auth URL: private/local network is not allowed")
+	}
+
+	return nil
+}
+
+func summarizeURLForLog(urlStr string) string {
+	parsed, err := url.Parse(urlStr)
+	if err != nil {
+		return urlStr
+	}
+	if parsed.Host == "" {
+		return parsed.Scheme + "://"
+	}
+	return fmt.Sprintf("%s://%s%s", parsed.Scheme, parsed.Host, parsed.Path)
+}
+
 func (r *ExtensionRuntime) authOpenUrl(call goja.FunctionCall) goja.Value {
 	if len(call.Arguments) < 1 {
 		return r.vm.ToValue(map[string]interface{}{
@@ -32,6 +69,13 @@ func (r *ExtensionRuntime) authOpenUrl(call goja.FunctionCall) goja.Value {
 		callbackURL = call.Arguments[1].String()
 	}

+	if err := validateExtensionAuthURL(authURL); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}
+
 	pendingAuthRequestsMu.Lock()
 	pendingAuthRequests[r.extensionID] = &PendingAuthRequest{
 		ExtensionID: r.extensionID,
@@ -50,7 +94,7 @@ func (r *ExtensionRuntime) authOpenUrl(call goja.FunctionCall) goja.Value {
 	state.AuthCode = ""
 	extensionAuthStateMu.Unlock()

-	GoLog("[Extension:%s] Auth URL requested: %s\n", r.extensionID, authURL)
+	GoLog("[Extension:%s] Auth URL requested: %s\n", r.extensionID, summarizeURLForLog(authURL))

 	return r.vm.ToValue(map[string]interface{}{
 		"success": true,
@@ -121,7 +165,6 @@ func (r *ExtensionRuntime) authClear(call goja.FunctionCall) goja.Value {
 	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()
@@ -194,7 +237,6 @@ func generatePKCEChallenge(verifier string) string {
 }

 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 {
@@ -247,9 +289,7 @@ func (r *ExtensionRuntime) authGetPKCE(call goja.FunctionCall) goja.Value {
 	})
 }

-// 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{}{
@@ -267,7 +307,6 @@ func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.V
 		})
 	}

-	// Required fields
 	authURL, _ := config["authUrl"].(string)
 	clientID, _ := config["clientId"].(string)
 	redirectURI, _ := config["redirectUri"].(string)
@@ -278,12 +317,16 @@ func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.V
 			"error":   "authUrl, clientId, and redirectUri are required",
 		})
 	}
+	if err := validateExtensionAuthURL(authURL); err != nil {
+		return r.vm.ToValue(map[string]interface{}{
+			"success": false,
+			"error":   err.Error(),
+		})
+	}

-	// 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{}{
@@ -293,7 +336,6 @@ func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.V
 	}
 	challenge := generatePKCEChallenge(verifier)

-	// Store PKCE in auth state
 	extensionAuthStateMu.Lock()
 	state, exists := extensionAuthState[r.extensionID]
 	if !exists {
@@ -302,10 +344,9 @@ func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.V
 	}
 	state.PKCEVerifier = verifier
 	state.PKCEChallenge = challenge
-	state.AuthCode = "" // Clear any previous auth code
+	state.AuthCode = ""
 	extensionAuthStateMu.Unlock()

-	// Build OAuth URL with PKCE parameters
 	parsedURL, err := url.Parse(authURL)
 	if err != nil {
 		return r.vm.ToValue(map[string]interface{}{
@@ -325,7 +366,6 @@ func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.V
 		query.Set("scope", scope)
 	}

-	// Add extra params
 	for k, v := range extraParams {
 		query.Set(k, fmt.Sprintf("%v", v))
 	}
@@ -333,7 +373,6 @@ func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.V
 	parsedURL.RawQuery = query.Encode()
 	fullAuthURL := parsedURL.String()

-	// Store pending auth request for Flutter
 	pendingAuthRequestsMu.Lock()
 	pendingAuthRequests[r.extensionID] = &PendingAuthRequest{
 		ExtensionID: r.extensionID,
@@ -342,7 +381,7 @@ func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.V
 	}
 	pendingAuthRequestsMu.Unlock()

-	GoLog("[Extension:%s] PKCE OAuth started: %s\n", r.extensionID, fullAuthURL)
+	GoLog("[Extension:%s] PKCE OAuth started: %s\n", r.extensionID, summarizeURLForLog(fullAuthURL))

 	return r.vm.ToValue(map[string]interface{}{
 		"success": true,
@@ -452,13 +491,17 @@ func (r *ExtensionRuntime) authExchangeCodeWithPKCE(call goja.FunctionCall) goja
 			"error":   err.Error(),
 		})
 	}
+	bodyPreview := sanitizeSensitiveLogText(string(body))
+	if len(bodyPreview) > 1000 {
+		bodyPreview = bodyPreview[:1000] + "...[truncated]"
+	}

 	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),
+			"body":    bodyPreview,
 		})
 	}

@@ -479,7 +522,7 @@ func (r *ExtensionRuntime) authExchangeCodeWithPKCE(call goja.FunctionCall) goja
 		return r.vm.ToValue(map[string]interface{}{
 			"success": false,
 			"error":   "no access_token in response",
-			"body":    string(body),
+			"body":    bodyPreview,
 		})
 	}

@@ -64,7 +64,6 @@ func (r *ExtensionRuntime) ffmpegExecute(call goja.FunctionCall) goja.Value {

 	command := call.Arguments[0].String()

-	// Generate unique command ID
 	ffmpegCommandsMu.Lock()
 	ffmpegCommandID++
 	cmdID := fmt.Sprintf("%s_%d", r.extensionID, ffmpegCommandID)
@@ -77,7 +76,6 @@ func (r *ExtensionRuntime) ffmpegExecute(call goja.FunctionCall) goja.Value {

 	GoLog("[Extension:%s] FFmpeg command queued: %s\n", r.extensionID, cmdID)

-	// Wait for completion (with timeout)
 	timeout := 5 * time.Minute
 	start := time.Now()
 	for {
@@ -97,7 +95,6 @@ func (r *ExtensionRuntime) ffmpegExecute(call goja.FunctionCall) goja.Value {
 			}
 			ffmpegCommandsMu.RUnlock()

-			// Cleanup
 			ClearFFmpegCommand(cmdID)
 			return r.vm.ToValue(result)
 		}
@@ -124,7 +121,6 @@ func (r *ExtensionRuntime) ffmpegGetInfo(call goja.FunctionCall) goja.Value {

 	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{}{
@@ -153,7 +149,6 @@ func (r *ExtensionRuntime) ffmpegConvert(call goja.FunctionCall) goja.Value {
 	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 {
@@ -161,36 +156,29 @@ func (r *ExtensionRuntime) ffmpegConvert(call goja.FunctionCall) goja.Value {
 		}
 	}

-	// 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)},
 	}
@@ -41,15 +41,40 @@ func isPathInAllowedDirs(absPath string) bool {
 	defer allowedDownloadDirsMu.RUnlock()

 	for _, allowedDir := range allowedDownloadDirs {
-		if strings.HasPrefix(absPath, allowedDir) {
+		if isPathWithinBase(allowedDir, absPath) {
 			return true
 		}
 	}
 	return false
 }

+func isPathWithinBase(baseDir, targetPath string) bool {
+	baseAbs, err := filepath.Abs(baseDir)
+	if err != nil {
+		return false
+	}
+	targetAbs, err := filepath.Abs(targetPath)
+	if err != nil {
+		return false
+	}
+
+	rel, err := filepath.Rel(baseAbs, targetAbs)
+	if err != nil {
+		return false
+	}
+	rel = filepath.Clean(rel)
+	if rel == "." {
+		return true
+	}
+
+	prefix := ".." + string(filepath.Separator)
+	if rel == ".." || strings.HasPrefix(rel, prefix) {
+		return false
+	}
+	return true
+}
+
 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")
 	}
@@ -77,7 +102,7 @@ func (r *ExtensionRuntime) validatePath(path string) (string, error) {
 	}

 	absDataDir, _ := filepath.Abs(r.dataDir)
-	if !strings.HasPrefix(absPath, absDataDir) {
+	if !isPathWithinBase(absDataDir, absPath) {
 		return "", fmt.Errorf("file access denied: path '%s' is outside sandbox", path)
 	}

@@ -323,7 +348,6 @@ func (r *ExtensionRuntime) fileWrite(call goja.FunctionCall) goja.Value {
 		})
 	}

-	// Create directory if needed
 	dir := filepath.Dir(fullPath)
 	if err := os.MkdirAll(dir, 0755); err != nil {
 		return r.vm.ToValue(map[string]interface{}{
@@ -26,9 +26,21 @@ func (r *ExtensionRuntime) validateDomain(urlStr string) error {
 		return fmt.Errorf("invalid URL: %w", err)
 	}

-	domain := parsed.Hostname()
+	if parsed.Scheme == "" {
+		return fmt.Errorf("invalid URL: scheme is required")
+	}
+	if parsed.Scheme != "https" {
+		return fmt.Errorf("network access denied: only https is allowed")
+	}
+	if parsed.User != nil {
+		return fmt.Errorf("invalid URL: embedded credentials are not allowed")
+	}
+
+	domain := parsed.Hostname()
+	if domain == "" {
+		return fmt.Errorf("invalid URL: hostname is required")
+	}

-	// Block private/local network access (SSRF protection)
 	if isPrivateIP(domain) {
 		return fmt.Errorf("network access denied: private/local network '%s' not allowed", domain)
 	}
@@ -9,7 +9,6 @@ import (

 // ==================== 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)
@@ -22,12 +21,10 @@ func (r *ExtensionRuntime) matchingCompareStrings(call goja.FunctionCall) goja.V
 		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)
@@ -36,8 +33,7 @@ func (r *ExtensionRuntime) matchingCompareDuration(call goja.FunctionCall) goja.
 	dur1 := int(call.Arguments[0].ToInteger())
 	dur2 := int(call.Arguments[1].ToInteger())

-	// Default tolerance: 3 seconds
-	tolerance := 3000 // milliseconds
+	tolerance := 3000
 	if len(call.Arguments) > 2 && !goja.IsUndefined(call.Arguments[2]) {
 		tolerance = int(call.Arguments[2].ToInteger())
 	}
@@ -50,7 +46,6 @@ func (r *ExtensionRuntime) matchingCompareDuration(call goja.FunctionCall) goja.
 	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("")
@@ -61,7 +56,6 @@ func (r *ExtensionRuntime) matchingNormalizeString(call goja.FunctionCall) goja.
 	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
@@ -70,7 +64,6 @@ func calculateStringSimilarity(s1, s2 string) float64 {
 		return 0.0
 	}

-	// Use Levenshtein distance
 	distance := levenshteinDistance(s1, s2)
 	maxLen := len(s1)
 	if len(s2) > maxLen {
@@ -80,7 +73,6 @@ func calculateStringSimilarity(s1, s2 string) float64 {
 	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)
@@ -89,7 +81,6 @@ func levenshteinDistance(s1, s2 string) int {
 		return len(s1)
 	}

-	// Create matrix
 	matrix := make([][]int, len(s1)+1)
 	for i := range matrix {
 		matrix[i] = make([]int, len(s2)+1)
@@ -99,7 +90,6 @@ func levenshteinDistance(s1, s2 string) int {
 		matrix[0][j] = j
 	}

-	// Fill matrix
 	for i := 1; i <= len(s1); i++ {
 		for j := 1; j <= len(s2); j++ {
 			cost := 1
@@ -107,9 +97,9 @@ func levenshteinDistance(s1, s2 string) int {
 				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
+				matrix[i-1][j]+1,
+				matrix[i][j-1]+1,
+				matrix[i-1][j-1]+cost,
 			)
 		}
 	}
@@ -117,12 +107,9 @@ func levenshteinDistance(s1, s2 string) int {
 	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",
@@ -136,7 +123,6 @@ func normalizeStringForMatching(s string) string {
 		}
 	}

-	// Remove special characters
 	var result strings.Builder
 	for _, r := range s {
 		if (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9') || r == ' ' {
@@ -144,7 +130,6 @@ func normalizeStringForMatching(s string) string {
 		}
 	}

-	// Collapse multiple spaces
 	s = strings.Join(strings.Fields(result.String()), " ")

 	return strings.TrimSpace(s)
@@ -25,14 +25,11 @@ func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
 	}

 	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)
@@ -40,7 +37,6 @@ func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
 	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)
 			}
@@ -61,7 +57,6 @@ func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
 				}
 			}

-			// Headers
 			if h, ok := opts["headers"]; ok && h != nil {
 				switch hv := h.(type) {
 				case map[string]interface{}:
@@ -73,7 +68,6 @@ func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
 		}
 	}

-	// Create HTTP request
 	var reqBody io.Reader
 	if bodyStr != "" {
 		reqBody = strings.NewReader(bodyStr)
@@ -84,11 +78,9 @@ func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
 		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")
 	}
@@ -96,20 +88,17 @@ func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
 		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 {
@@ -119,7 +108,6 @@ func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
 		}
 	}

-	// Create Response object (browser-compatible)
 	responseObj := r.vm.NewObject()
 	responseObj.Set("ok", resp.StatusCode >= 200 && resp.StatusCode < 300)
 	responseObj.Set("status", resp.StatusCode)
@@ -127,15 +115,12 @@ func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
 	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 {
@@ -145,9 +130,7 @@ func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
 		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)
@@ -182,7 +165,6 @@ func (r *ExtensionRuntime) atobPolyfill(call goja.FunctionCall) goja.Value {
 	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)
@@ -203,12 +185,10 @@ func (r *ExtensionRuntime) btoaPolyfill(call goja.FunctionCall) goja.Value {

 // 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{})
@@ -216,7 +196,6 @@ func (r *ExtensionRuntime) registerTextEncoderDecoder(vm *goja.Runtime) {
 			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)
@@ -224,7 +203,6 @@ func (r *ExtensionRuntime) registerTextEncoderDecoder(vm *goja.Runtime) {
 			return vm.ToValue(result)
 		})

-		// encodeInto() method
 		encoder.Set("encodeInto", func(call goja.FunctionCall) goja.Value {
 			// Simplified implementation
 			if len(call.Arguments) < 2 {
@@ -240,11 +218,9 @@ func (r *ExtensionRuntime) registerTextEncoderDecoder(vm *goja.Runtime) {
 		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()
@@ -253,13 +229,11 @@ func (r *ExtensionRuntime) registerTextEncoderDecoder(vm *goja.Runtime) {
 		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

@@ -279,7 +253,6 @@ func (r *ExtensionRuntime) registerTextEncoderDecoder(vm *goja.Runtime) {
 					}
 				}
 			case string:
-				// Already a string, just return it
 				return vm.ToValue(v)
 			default:
 				return vm.ToValue("")
@@ -292,7 +265,6 @@ func (r *ExtensionRuntime) registerTextEncoderDecoder(vm *goja.Runtime) {
 	})
 }

-// 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
@@ -304,7 +276,6 @@ func (r *ExtensionRuntime) registerURLClass(vm *goja.Runtime) {

 		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)
@@ -322,7 +293,6 @@ func (r *ExtensionRuntime) registerURLClass(vm *goja.Runtime) {
 			return nil
 		}

-		// Set URL properties
 		urlObj.Set("href", parsed.String())
 		urlObj.Set("protocol", parsed.Scheme+":")
 		urlObj.Set("host", parsed.Host)
@@ -342,10 +312,9 @@ func (r *ExtensionRuntime) registerURLClass(vm *goja.Runtime) {
 		password, _ := parsed.User.Password()
 		urlObj.Set("password", password)

-		// searchParams object
-		searchParams := vm.NewObject()
 		queryValues := parsed.Query()

+		searchParams := vm.NewObject()
 		searchParams.Set("get", func(call goja.FunctionCall) goja.Value {
 			if len(call.Arguments) < 1 {
 				return goja.Null()
@@ -379,12 +348,10 @@ func (r *ExtensionRuntime) registerURLClass(vm *goja.Runtime) {

 		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())
 		})
@@ -392,17 +359,14 @@ func (r *ExtensionRuntime) registerURLClass(vm *goja.Runtime) {
 		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{}:
@@ -468,10 +432,6 @@ func (r *ExtensionRuntime) registerURLClass(vm *goja.Runtime) {
 // 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 = {
@@ -46,7 +46,7 @@ func (r *ExtensionRuntime) saveStorage(storage map[string]interface{}) error {
 		return err
 	}

-	return os.WriteFile(storagePath, data, 0644)
+	return os.WriteFile(storagePath, data, 0600)
 }

 func (r *ExtensionRuntime) storageGet(call goja.FunctionCall) goja.Value {
@@ -15,7 +15,6 @@ type ExtensionSettingsStore struct {
 	settings map[string]map[string]interface{} // extensionID -> settings
 }

-// Global settings store
 var (
 	globalSettingsStore     *ExtensionSettingsStore
 	globalSettingsStoreOnce sync.Once
@@ -129,7 +128,6 @@ func (s *ExtensionSettingsStore) GetAll(extensionID string) map[string]interface
 		return make(map[string]interface{})
 	}

-	// Return a copy
 	result := make(map[string]interface{})
 	for k, v := range extSettings {
 		result[k] = v
@@ -156,7 +154,6 @@ func (s *ExtensionSettingsStore) SetAll(extensionID string, settings map[string]

 	s.settings[extensionID] = settings

-	// Persist to disk
 	return s.saveSettings(extensionID, settings)
 }

@@ -171,7 +168,6 @@ func (s *ExtensionSettingsStore) Remove(extensionID, key string) error {

 	delete(extSettings, key)

-	// Persist to disk
 	return s.saveSettings(extensionID, extSettings)
 }

@@ -5,13 +5,13 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/url"
 	"os"
 	"path/filepath"
 	"sync"
 	"time"
 )

-// Extension categories
 const (
 	CategoryMetadata    = "metadata"
 	CategoryDownload    = "download"
@@ -145,7 +145,6 @@ func InitExtensionStore(cacheDir string) *ExtensionStore {
 			cacheDir:    cacheDir,
 			cacheTTL:    cacheTTL,
 		}
-		// Try to load from disk cache
 		extensionStore.loadDiskCache()
 	}
 	return extensionStore
@@ -208,18 +207,20 @@ 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
 	}

+	if err := requireHTTPSURL(s.registryURL, "registry"); err != nil {
+		return nil, err
+	}
+
 	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
@@ -303,6 +304,10 @@ func (s *ExtensionStore) DownloadExtension(extensionID string, destPath string)
 		return fmt.Errorf("extension %s not found in store", extensionID)
 	}

+	if err := requireHTTPSURL(ext.getDownloadURL(), "extension download"); err != nil {
+		return err
+	}
+
 	LogInfo("ExtensionStore", "Downloading %s from %s", ext.getDisplayName(), ext.getDownloadURL())

 	client := &http.Client{Timeout: 5 * time.Minute}
@@ -332,6 +337,20 @@ func (s *ExtensionStore) DownloadExtension(extensionID string, destPath string)
 	return nil
 }

+func requireHTTPSURL(rawURL string, context string) error {
+	if rawURL == "" {
+		return fmt.Errorf("%s URL is empty", context)
+	}
+	parsed, err := url.Parse(rawURL)
+	if err != nil || parsed.Host == "" {
+		return fmt.Errorf("%s URL is invalid: %s", context, rawURL)
+	}
+	if parsed.Scheme != "https" {
+		return fmt.Errorf("%s URL must use https: %s", context, rawURL)
+	}
+	return nil
+}
+
 func (s *ExtensionStore) GetCategories() []string {
 	return []string{
 		CategoryMetadata,
@@ -112,7 +112,6 @@ func TestExtensionRuntime_NetworkSandbox(t *testing.T) {

 	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)
 	}
@@ -121,7 +120,6 @@ func TestExtensionRuntime_NetworkSandbox(t *testing.T) {
 		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")
 	}
@@ -139,7 +137,7 @@ func TestExtensionRuntime_FileSandbox(t *testing.T) {
 		Manifest: &ExtensionManifest{
 			Name: "test-ext",
 			Permissions: ExtensionPermissions{
-				File: true, // Enable file permission for test
+				File: true,
 			},
 		},
 		DataDir: tempDir,
@@ -147,7 +145,6 @@ func TestExtensionRuntime_FileSandbox(t *testing.T) {

 	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)
@@ -156,13 +153,11 @@ func TestExtensionRuntime_FileSandbox(t *testing.T) {
 		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)
@@ -171,26 +166,23 @@ func TestExtensionRuntime_FileSandbox(t *testing.T) {
 		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
+		absPath = "C:\\Windows\\System32\\test.txt"
 	} else {
-		absPath = "/etc/passwd" // Unix
+		absPath = "/etc/passwd"
 	}
 	_, 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
+				File: false,
 			},
 		},
 		DataDir: tempDir,
@@ -215,7 +207,6 @@ func TestExtensionRuntime_UtilityFunctions(t *testing.T) {
 	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)
@@ -232,7 +223,6 @@ func TestExtensionRuntime_UtilityFunctions(t *testing.T) {
 		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)
@@ -241,7 +231,6 @@ func TestExtensionRuntime_UtilityFunctions(t *testing.T) {
 		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)
@@ -267,7 +256,6 @@ func TestExtensionRuntime_SSRFProtection(t *testing.T) {

 	runtime := NewExtensionRuntime(ext)

-	// Test that private IPs are blocked (SSRF protection)
 	privateIPs := []string{
 		"http://localhost/admin",
 		"http://127.0.0.1/admin",
@@ -285,7 +273,6 @@ func TestExtensionRuntime_SSRFProtection(t *testing.T) {
 		}
 	}

-	// 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)
 	}
@@ -296,7 +283,6 @@ func TestIsPrivateIP(t *testing.T) {
 		host     string
 		expected bool
 	}{
-		// Private IPs should be blocked
 		{"localhost", true},
 		{"127.0.0.1", true},
 		{"127.0.0.2", true},
@@ -306,18 +292,17 @@ func TestIsPrivateIP(t *testing.T) {
 		{"172.31.255.255", true},
 		{"192.168.0.1", true},
 		{"192.168.255.255", true},
-		{"169.254.169.254", true}, // AWS metadata
+		{"169.254.169.254", true},
 		{"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
+		{"172.15.0.1", false},
+		{"172.32.0.1", false},
+		{"192.167.0.1", false},
 	}

 	for _, tt := range tests {
@@ -4,13 +4,13 @@ package gobackend
 import (
 	"context"
 	"fmt"
+	"runtime/debug"
 	"sync"
 	"time"

 	"github.com/dop251/goja"
 )

-// JSExecutionError represents an error during JS execution
 type JSExecutionError struct {
 	Message   string
 	IsTimeout bool
@@ -20,8 +20,6 @@ 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
@@ -30,22 +28,18 @@ func RunWithTimeout(vm *goja.Runtime, script string, timeout time.Duration) (goj
 	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()
@@ -56,6 +50,7 @@ func RunWithTimeout(vm *goja.Runtime, script string, timeout time.Duration) (goj
 						IsTimeout: true,
 					}}
 				} else {
+					GoLog("[ExtensionRuntime] panic during JS execution: %v\n%s\n", r, string(debug.Stack()))
 					resultCh <- result{nil, fmt.Errorf("panic during execution: %v", r)}
 				}
 			}
@@ -65,22 +60,18 @@ func RunWithTimeout(vm *goja.Runtime, script string, timeout time.Duration) (goj
 		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
 			}
@@ -89,7 +80,6 @@ func RunWithTimeout(vm *goja.Runtime, script string, timeout time.Duration) (goj
 				IsTimeout: true,
 			}
 		case <-time.After(1 * time.Second):
-			// Force return timeout error
 			return nil, &JSExecutionError{
 				Message:   "execution timeout exceeded (force)",
 				IsTimeout: true,
@@ -109,7 +99,6 @@ func RunWithTimeoutAndRecover(vm *goja.Runtime, script string, timeout time.Dura
 	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
@@ -3,28 +3,35 @@ package gobackend
 import (
 	"fmt"
 	"regexp"
+	"strconv"
 	"strings"
+	"time"
 )

-var invalidChars = regexp.MustCompile(`[<>:"/\\|?*\x00-\x1f]`)
+var (
+	invalidChars                   = regexp.MustCompile(`[<>:"/\\|?*\x00-\x1f]`)
+	multiUnderscore                = regexp.MustCompile(`_+`)
+	formattedNumberPlaceholderExpr = regexp.MustCompile(`\{(track|disc):([0-9]+)\}`)
+	dateFormatPlaceholderExpr      = regexp.MustCompile(`\{date:([^{}]+)\}`)
+	yearPattern                    = regexp.MustCompile(`\d{4}`)
+)

 func sanitizeFilename(filename string) string {
 	sanitized := invalidChars.ReplaceAllString(filename, "_")
-	
+
 	sanitized = strings.TrimSpace(sanitized)
 	sanitized = strings.Trim(sanitized, ".")
-	
-	multiUnderscore := regexp.MustCompile(`_+`)
+
 	sanitized = multiUnderscore.ReplaceAllString(sanitized, "_")
-	
+
 	if len(sanitized) > 200 {
 		sanitized = sanitized[:200]
 	}
-	
+
 	if sanitized == "" {
 		sanitized = "untitled"
 	}
-	
+
 	return sanitized
 }

@@ -32,45 +39,120 @@ func buildFilenameFromTemplate(template string, metadata map[string]interface{})
 	if template == "" {
 		template = "{artist} - {title}"
 	}
-	
-	result := template
-	
-	placeholders := map[string]string{
-		"{title}":  getString(metadata, "title"),
-		"{artist}": getString(metadata, "artist"),
-		"{album}":  getString(metadata, "album"),
-		"{track}":  formatTrackNumber(getInt(metadata, "track")),
-		"{year}":   getString(metadata, "year"),
-		"{disc}":   formatDiscNumber(getInt(metadata, "disc")),
+
+	result := replaceFormattedNumberPlaceholders(template, metadata)
+	result = replaceDateFormatPlaceholders(result, metadata)
+
+	dateValue := getDateValue(metadata)
+	yearValue := getString(metadata, "year")
+	if yearValue == "" {
+		yearValue = extractYear(dateValue)
 	}
-	
+
+	placeholders := map[string]string{
+		"{title}":     getString(metadata, "title"),
+		"{artist}":    getString(metadata, "artist"),
+		"{album}":     getString(metadata, "album"),
+		"{track}":     formatTrackNumber(getInt(metadata, "track")),
+		"{track_raw}": formatRawNumber(getInt(metadata, "track")),
+		"{year}":      yearValue,
+		"{date}":      dateValue,
+		"{disc}":      formatDiscNumber(getInt(metadata, "disc")),
+		"{disc_raw}":  formatRawNumber(getInt(metadata, "disc")),
+	}
+
 	for placeholder, value := range placeholders {
 		result = strings.ReplaceAll(result, placeholder, value)
 	}
-	
+
 	return result
 }

+func replaceFormattedNumberPlaceholders(template string, metadata map[string]interface{}) string {
+	return formattedNumberPlaceholderExpr.ReplaceAllStringFunc(template, func(match string) string {
+		parts := formattedNumberPlaceholderExpr.FindStringSubmatch(match)
+		if len(parts) != 3 {
+			return ""
+		}
+
+		number := getInt(metadata, parts[1])
+		width, err := strconv.Atoi(parts[2])
+		if err != nil {
+			return ""
+		}
+
+		return formatNumberWithWidth(number, width)
+	})
+}
+
+func replaceDateFormatPlaceholders(template string, metadata map[string]interface{}) string {
+	return dateFormatPlaceholderExpr.ReplaceAllStringFunc(template, func(match string) string {
+		parts := dateFormatPlaceholderExpr.FindStringSubmatch(match)
+		if len(parts) != 2 {
+			return ""
+		}
+
+		return formatDateWithPattern(getDateValue(metadata), parts[1])
+	})
+}
+
+func getDateValue(metadata map[string]interface{}) string {
+	date := getString(metadata, "date")
+	if date != "" {
+		return date
+	}
+
+	releaseDate := getString(metadata, "release_date")
+	if releaseDate != "" {
+		return releaseDate
+	}
+
+	return getString(metadata, "year")
+}
+
 func getString(m map[string]interface{}, key string) string {
 	if v, ok := m[key]; ok {
-		if s, ok := v.(string); ok {
-			return strings.TrimSpace(s)
+		switch value := v.(type) {
+		case string:
+			return strings.TrimSpace(value)
+		case int:
+			return strconv.Itoa(value)
+		case int64:
+			return strconv.FormatInt(value, 10)
+		case float64:
+			return strconv.Itoa(int(value))
 		}
 	}
 	return ""
 }

 func getInt(m map[string]interface{}, key string) int {
-	if v, ok := m[key]; ok {
-		switch n := v.(type) {
-		case int:
-			return n
-		case int64:
-			return int(n)
-		case float64:
-			return int(n)
+	candidateKeys := []string{key}
+	switch key {
+	case "track":
+		candidateKeys = append(candidateKeys, "track_number")
+	case "disc":
+		candidateKeys = append(candidateKeys, "disc_number")
+	}
+
+	for _, candidate := range candidateKeys {
+		if v, ok := m[candidate]; ok {
+			switch n := v.(type) {
+			case int:
+				return n
+			case int64:
+				return int(n)
+			case float64:
+				return int(n)
+			case string:
+				parsed, err := strconv.Atoi(strings.TrimSpace(n))
+				if err == nil {
+					return parsed
+				}
+			}
 		}
 	}
+
 	return 0
 }

@@ -88,6 +170,129 @@ func formatDiscNumber(n int) string {
 	return fmt.Sprintf("%d", n)
 }

+func formatRawNumber(n int) string {
+	if n <= 0 {
+		return ""
+	}
+	return fmt.Sprintf("%d", n)
+}
+
+func formatNumberWithWidth(n int, width int) string {
+	if n <= 0 || width <= 0 {
+		return ""
+	}
+	if width <= 1 {
+		return formatRawNumber(n)
+	}
+	return fmt.Sprintf("%0*d", width, n)
+}
+
+func formatDateWithPattern(rawDate string, strftimePattern string) string {
+	if rawDate == "" || strftimePattern == "" {
+		return ""
+	}
+
+	parsedDate, ok := parseMetadataDate(rawDate)
+	if !ok {
+		return ""
+	}
+
+	goLayout := convertStrftimeToGoLayout(strftimePattern)
+	if goLayout == "" {
+		return ""
+	}
+
+	return parsedDate.Format(goLayout)
+}
+
+func parseMetadataDate(rawDate string) (time.Time, bool) {
+	clean := strings.TrimSpace(rawDate)
+	if clean == "" {
+		return time.Time{}, false
+	}
+
+	layouts := []string{
+		time.RFC3339Nano,
+		time.RFC3339,
+		"2006-01-02",
+		"2006-01",
+		"2006",
+		"2006/01/02",
+		"2006/01",
+		"2006.01.02",
+		"2006.01",
+	}
+
+	for _, layout := range layouts {
+		parsed, err := time.Parse(layout, clean)
+		if err == nil {
+			return parsed, true
+		}
+	}
+
+	if len(clean) >= 10 {
+		parsed, err := time.Parse("2006-01-02", clean[:10])
+		if err == nil {
+			return parsed, true
+		}
+	}
+
+	yearMatch := yearPattern.FindString(clean)
+	if yearMatch == "" {
+		return time.Time{}, false
+	}
+
+	year, err := strconv.Atoi(yearMatch)
+	if err != nil || year <= 0 {
+		return time.Time{}, false
+	}
+
+	return time.Date(year, time.January, 1, 0, 0, 0, 0, time.UTC), true
+}
+
+func convertStrftimeToGoLayout(pattern string) string {
+	if pattern == "" {
+		return ""
+	}
+
+	var builder strings.Builder
+	for i := 0; i < len(pattern); i++ {
+		ch := pattern[i]
+		if ch != '%' {
+			builder.WriteByte(ch)
+			continue
+		}
+
+		if i+1 >= len(pattern) {
+			builder.WriteByte('%')
+			break
+		}
+
+		i++
+		switch pattern[i] {
+		case 'Y':
+			builder.WriteString("2006")
+		case 'y':
+			builder.WriteString("06")
+		case 'm':
+			builder.WriteString("01")
+		case 'd':
+			builder.WriteString("02")
+		case 'b':
+			builder.WriteString("Jan")
+		case 'B':
+			builder.WriteString("January")
+		case '%':
+			builder.WriteByte('%')
+		default:
+			builder.WriteByte('%')
+			builder.WriteByte(pattern[i])
+		}
+	}
+
+	return builder.String()
+}
+
 func extractYear(date string) string {
 	if len(date) >= 4 {
 		return date[:4]
@@ -0,0 +1,85 @@
+package gobackend
+
+import "testing"
+
+func TestBuildFilenameFromTemplate_WithRawTrackAndDisc(t *testing.T) {
+	metadata := map[string]interface{}{
+		"title":  "Song Name",
+		"artist": "Artist Name",
+		"album":  "Album Name",
+		"track":  1,
+		"disc":   2,
+		"year":   "2025",
+	}
+
+	formatted := buildFilenameFromTemplate(
+		"{artist} - {track} - {track_raw} - d{disc} - d{disc_raw} - {title}",
+		metadata,
+	)
+
+	expected := "Artist Name - 01 - 1 - d2 - d2 - Song Name"
+	if formatted != expected {
+		t.Fatalf("expected %q, got %q", expected, formatted)
+	}
+}
+
+func TestBuildFilenameFromTemplate_RawPlaceholdersEmptyWhenZero(t *testing.T) {
+	metadata := map[string]interface{}{
+		"title":  "Song Name",
+		"artist": "Artist Name",
+		"track":  0,
+		"disc":   0,
+	}
+
+	formatted := buildFilenameFromTemplate("{track_raw}-{disc_raw}-{title}", metadata)
+	expected := "--Song Name"
+	if formatted != expected {
+		t.Fatalf("expected %q, got %q", expected, formatted)
+	}
+}
+
+func TestBuildFilenameFromTemplate_InlineNumberFormatting(t *testing.T) {
+	metadata := map[string]interface{}{
+		"track": 3,
+		"disc":  2,
+	}
+
+	formatted := buildFilenameFromTemplate("{track:1}-{track:02}-{disc:03}", metadata)
+	expected := "3-03-002"
+	if formatted != expected {
+		t.Fatalf("expected %q, got %q", expected, formatted)
+	}
+}
+
+func TestBuildFilenameFromTemplate_DateStrftimeFormatting(t *testing.T) {
+	metadata := map[string]interface{}{
+		"artist":       "Artist Name",
+		"title":        "Song Name",
+		"release_date": "2024-03-09",
+		"track_number": 7,
+		"disc_number":  1,
+	}
+
+	formatted := buildFilenameFromTemplate(
+		"{artist} - {track:02} - {title} - {date:%Y-%m-%d} - {year}",
+		metadata,
+	)
+	expected := "Artist Name - 07 - Song Name - 2024-03-09 - 2024"
+	if formatted != expected {
+		t.Fatalf("expected %q, got %q", expected, formatted)
+	}
+}
+
+func TestBuildFilenameFromTemplate_DateStrftimeFormattingWithYearOnly(t *testing.T) {
+	metadata := map[string]interface{}{
+		"artist": "Artist Name",
+		"title":  "Song Name",
+		"date":   "2019",
+	}
+
+	formatted := buildFilenameFromTemplate("{date:%Y}-{date:%m}-{date:%d}", metadata)
+	expected := "2019-01-01"
+	if formatted != expected {
+		t.Fatalf("expected %q, got %q", expected, formatted)
+	}
+}
@@ -2,16 +2,16 @@ module github.com/zarz/spotiflac_android/go_backend

 go 1.25.0

-toolchain go1.25.6
+toolchain go1.26.0

 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
+	github.com/go-flac/flacpicture/v2 v2.0.2
+	github.com/go-flac/flacvorbis/v2 v2.0.2
+	github.com/go-flac/go-flac/v2 v2.0.4
 	github.com/refraction-networking/utls v1.8.2
-	golang.org/x/mobile v0.0.0-20260120165949-40bd9ace6ce4
-	golang.org/x/net v0.49.0
+	golang.org/x/mobile v0.0.0-20260209203831-923679eb55af
+	golang.org/x/net v0.50.0
 )

 require (
@@ -20,10 +20,10 @@ require (
 	github.com/go-sourcemap/sourcemap v2.1.3+incompatible // indirect
 	github.com/google/pprof v0.0.0-20230207041349-798e818bf904 // indirect
 	github.com/klauspost/compress v1.17.4 // indirect
-	golang.org/x/crypto v0.47.0 // indirect
-	golang.org/x/mod v0.32.0 // indirect
+	golang.org/x/crypto v0.48.0 // indirect
+	golang.org/x/mod v0.33.0 // indirect
 	golang.org/x/sync v0.19.0 // indirect
-	golang.org/x/sys v0.40.0 // indirect
-	golang.org/x/text v0.33.0 // indirect
-	golang.org/x/tools v0.41.0 // indirect
+	golang.org/x/sys v0.41.0 // indirect
+	golang.org/x/text v0.34.0 // indirect
+	golang.org/x/tools v0.42.0 // indirect
 )
@@ -2,16 +2,18 @@ github.com/Masterminds/semver/v3 v3.2.1 h1:RN9w6+7QoMeJVGyfmbcgs28Br8cvmnucEXnY0
 github.com/Masterminds/semver/v3 v3.2.1/go.mod h1:qvl/7zhW3nngYb5+80sSMF+FG2BjYrf8m9wsX0PNOMQ=
 github.com/andybalholm/brotli v1.0.6 h1:Yf9fFpf49Zrxb9NlQaluyE92/+X7UVHlhMNJN2sxfOI=
 github.com/andybalholm/brotli v1.0.6/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 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-flac/flacpicture/v2 v2.0.2 h1:HCaJIVZpxnpdWs6G3ECEVRelzqS5xOi1Ba1AGmtXbzE=
+github.com/go-flac/flacpicture/v2 v2.0.2/go.mod h1:DMZBPWPAmdLqNhqFSy5ZBs9wyBzOekXutGfP7/TFCuo=
+github.com/go-flac/flacvorbis/v2 v2.0.2 h1:xCL3OhxrxWkHrbWUBvGNe+6FQ03yLmBbz0v5z4V2PoQ=
+github.com/go-flac/flacvorbis/v2 v2.0.2/go.mod h1:SwTB5gs13VaM/N7rstwPoUsPibiMKklgwybYP9dYo2g=
+github.com/go-flac/go-flac/v2 v2.0.4 h1:atf/kFa8U9idtkA//NO22XGr+MzQLeXZecnmP9sYBf0=
+github.com/go-flac/go-flac/v2 v2.0.4/go.mod h1:sYOlTKxutMW0RDYF+KlD6Zn+VOCZlIFQG/r/usPveCs=
 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/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
@@ -20,23 +22,43 @@ github.com/google/pprof v0.0.0-20230207041349-798e818bf904 h1:4/hN5RUoecvl+RmJRE
 github.com/google/pprof v0.0.0-20230207041349-798e818bf904/go.mod h1:uglQLonpP8qtYCYyzA+8c/9qtqgA3qsXGYqCPKARAFg=
 github.com/klauspost/compress v1.17.4 h1:Ej5ixsIri7BrIjBkRZLTo6ghwrEtHFk7ijlczPW4fZ4=
 github.com/klauspost/compress v1.17.4/go.mod h1:/dCuZOvVtNoHsyb+cuJD3itjs3NbnF6KH9zAO4BDxPM=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/refraction-networking/utls v1.8.2 h1:j4Q1gJj0xngdeH+Ox/qND11aEfhpgoEvV+S9iJ2IdQo=
 github.com/refraction-networking/utls v1.8.2/go.mod h1:jkSOEkLqn+S/jtpEHPOsVv/4V4EVnelwbMQl4vCWXAM=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 golang.org/x/crypto v0.47.0 h1:V6e3FRj+n4dbpw86FJ8Fv7XVOql7TEwpHapKoMJ/GO8=
 golang.org/x/crypto v0.47.0/go.mod h1:ff3Y9VzzKbwSSEzWqJsJVBnWmRwRSHt/6Op5n9bQc4A=
-golang.org/x/mobile v0.0.0-20260120165949-40bd9ace6ce4 h1:C3JuLOLhdaE75vk5m7u18NvZciRk+lnO34xcXl3NPTU=
-golang.org/x/mobile v0.0.0-20260120165949-40bd9ace6ce4/go.mod h1:yHJY0EGzMJ0i5ONrrhdpDSSnoyres5LO7D2hSIbJJ5I=
+golang.org/x/crypto v0.48.0 h1:/VRzVqiRSggnhY7gNRxPauEQ5Drw9haKdM0jqfcCFts=
+golang.org/x/crypto v0.48.0/go.mod h1:r0kV5h3qnFPlQnBSrULhlsRfryS2pmewsg+XfMgkVos=
+golang.org/x/mobile v0.0.0-20260204172633-1dceadbbeea3 h1:NiJtT7g4ncNFVjVZMAYNBrPSNhIjFYPj8UKA8MEw2A4=
+golang.org/x/mobile v0.0.0-20260204172633-1dceadbbeea3/go.mod h1:wReH3Q1agKmmLapipWFnd4NSs8KPz3fK6mSEZjXLkrg=
+golang.org/x/mobile v0.0.0-20260209203831-923679eb55af h1:VqXrZNyqFISxo0rNDFZQlRDRIp7RXSJDeh/LbrK+W1k=
+golang.org/x/mobile v0.0.0-20260209203831-923679eb55af/go.mod h1:tbwefIr7RlQD1OpZ0KEZ9nux/uiihAOGdafgZfJkmII=
 golang.org/x/mod v0.32.0 h1:9F4d3PHLljb6x//jOyokMv3eX+YDeepZSEo3mFJy93c=
 golang.org/x/mod v0.32.0/go.mod h1:SgipZ/3h2Ci89DlEtEXWUk/HteuRin+HHhN+WbNhguU=
+golang.org/x/mod v0.33.0 h1:tHFzIWbBifEmbwtGz65eaWyGiGZatSrT9prnU8DbVL8=
+golang.org/x/mod v0.33.0/go.mod h1:swjeQEj+6r7fODbD2cqrnje9PnziFuw4bmLbBZFrQ5w=
 golang.org/x/net v0.49.0 h1:eeHFmOGUTtaaPSGNmjBKpbng9MulQsJURQUAfUwY++o=
 golang.org/x/net v0.49.0/go.mod h1:/ysNB2EvaqvesRkuLAyjI1ycPZlQHM3q01F02UY/MV8=
+golang.org/x/net v0.50.0 h1:ucWh9eiCGyDR3vtzso0WMQinm2Dnt8cFMuQa9K33J60=
+golang.org/x/net v0.50.0/go.mod h1:UgoSli3F/pBgdJBHCTc+tp3gmrU4XswgGRgtnwWTfyM=
 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/sys v0.40.0 h1:DBZZqJ2Rkml6QMQsZywtnjnnGvHza6BTfYFWY9kjEWQ=
 golang.org/x/sys v0.40.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
+golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
 golang.org/x/text v0.33.0 h1:B3njUFyqtHDUI5jMn1YIr5B0IE2U0qck04r6d4KPAxE=
 golang.org/x/text v0.33.0/go.mod h1:LuMebE6+rBincTi9+xWTY8TztLzKHc/9C1uBCG27+q8=
+golang.org/x/text v0.34.0 h1:oL/Qq0Kdaqxa1KbNeMKwQq0reLCCaFtqu2eNuSeNHbk=
+golang.org/x/text v0.34.0/go.mod h1:homfLqTYRFyVYemLBFl5GgL/DWEiH5wcsQ5gSh1yziA=
 golang.org/x/tools v0.41.0 h1:a9b8iMweWG+S0OBnlU36rzLp20z1Rp10w+IY2czHTQc=
 golang.org/x/tools v0.41.0/go.mod h1:XSY6eDqxVNiYgezAVqqCeihT4j1U2CCsqvH3WhQpnlg=
+golang.org/x/tools v0.42.0 h1:uNgphsn75Tdz5Ji2q36v/nsFSfR/9BRFvqhGBaJGd5k=
+golang.org/x/tools v0.42.0/go.mod h1:Ma6lCIwGZvHK6XtgbswSoWroEkhugApmsXyrUmBhfr0=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
@@ -16,7 +16,6 @@ import (
 )

 func getRandomUserAgent() string {
-	// Chrome version 120-145 (modern range)
 	chromeVersion := rand.Intn(26) + 120
 	chromeBuild := rand.Intn(1500) + 6000
 	chromePatch := rand.Intn(200) + 100
@@ -56,6 +55,27 @@ var sharedTransport = &http.Transport{
 	DisableCompression:    true,
 }

+// metadataTransport is a separate transport for metadata API calls (Deezer, Spotify, SongLink).
+// Isolated from download traffic so that download failures cannot poison
+// the connection pool used by metadata enrichment.
+var metadataTransport = &http.Transport{
+	DialContext: (&net.Dialer{
+		Timeout:   30 * time.Second,
+		KeepAlive: 30 * time.Second,
+	}).DialContext,
+	MaxIdleConns:          30,
+	MaxIdleConnsPerHost:   5,
+	MaxConnsPerHost:       10,
+	IdleConnTimeout:       90 * time.Second,
+	TLSHandshakeTimeout:   10 * time.Second,
+	ExpectContinueTimeout: 1 * time.Second,
+	DisableKeepAlives:     false,
+	ForceAttemptHTTP2:     true,
+	WriteBufferSize:       32 * 1024,
+	ReadBufferSize:        32 * 1024,
+	DisableCompression:    true,
+}
+
 var sharedClient = &http.Client{
 	Transport: sharedTransport,
 	Timeout:   DefaultTimeout,
@@ -73,6 +93,15 @@ func NewHTTPClientWithTimeout(timeout time.Duration) *http.Client {
 	}
 }

+// NewMetadataHTTPClient creates an HTTP client using the isolated metadata transport.
+// Use this for API calls that should not be affected by download traffic.
+func NewMetadataHTTPClient(timeout time.Duration) *http.Client {
+	return &http.Client{
+		Transport: metadataTransport,
+		Timeout:   timeout,
+	}
+}
+
 func GetSharedClient() *http.Client {
 	return sharedClient
 }
@@ -83,6 +112,7 @@ func GetDownloadClient() *http.Client {

 func CloseIdleConnections() {
 	sharedTransport.CloseIdleConnections()
+	metadataTransport.CloseIdleConnections()
 }

 // Also checks for ISP blocking on errors
@@ -118,7 +148,6 @@ func DoRequestWithRetry(client *http.Client, req *http.Request, config RetryConf
 	requestURL := req.URL.String()

 	for attempt := 0; attempt <= config.MaxRetries; attempt++ {
-		// Clone request for retry (body needs to be re-readable)
 		reqCopy := req.Clone(req.Context())
 		reqCopy.Header.Set("User-Agent", getRandomUserAgent())

@@ -126,9 +155,7 @@ func DoRequestWithRetry(client *http.Client, req *http.Request, config RetryConf
 		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")
 			}

@@ -35,7 +35,6 @@ func newUTLSTransport() *utlsTransport {
 }

 func (t *utlsTransport) RoundTrip(req *http.Request) (*http.Response, error) {
-	// For non-HTTPS, use standard transport
 	if req.URL.Scheme != "https" {
 		return sharedTransport.RoundTrip(req)
 	}
@@ -44,29 +43,24 @@ func (t *utlsTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 	port := t.getPort(req.URL)
 	addr := net.JoinHostPort(host, port)

-	// Dial TCP connection
 	conn, err := t.dialer.DialContext(req.Context(), "tcp", addr)
 	if err != nil {
 		return nil, err
 	}

-	// Create uTLS connection with Chrome fingerprint (supports HTTP/2 ALPN)
 	tlsConn := utls.UClient(conn, &utls.Config{
 		ServerName: host,
-		NextProtos: []string{"h2", "http/1.1"}, // Prefer HTTP/2
+		NextProtos: []string{"h2", "http/1.1"},
 	}, utls.HelloChrome_Auto)

-	// Perform TLS handshake
 	if err := tlsConn.Handshake(); err != nil {
 		conn.Close()
 		return nil, err
 	}

-	// Check if server supports HTTP/2
 	negotiatedProto := tlsConn.ConnectionState().NegotiatedProtocol

 	if negotiatedProto == "h2" {
-		// Use HTTP/2 transport
 		h2Transport := &http2.Transport{
 			DialTLSContext: func(ctx context.Context, network, addr string, cfg *tls.Config) (net.Conn, error) {
 				return tlsConn, nil
@@ -77,7 +71,6 @@ func (t *utlsTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 		return h2Transport.RoundTrip(req)
 	}

-	// Fallback to HTTP/1.1
 	transport := &http.Transport{
 		DialTLSContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
 			return tlsConn, nil
@@ -0,0 +1,616 @@
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+)
+
+// LibraryScanResult represents metadata from a scanned audio file
+type LibraryScanResult struct {
+	ID          string `json:"id"`
+	TrackName   string `json:"trackName"`
+	ArtistName  string `json:"artistName"`
+	AlbumName   string `json:"albumName"`
+	AlbumArtist string `json:"albumArtist,omitempty"`
+	FilePath    string `json:"filePath"`
+	CoverPath   string `json:"coverPath,omitempty"`
+	ScannedAt   string `json:"scannedAt"`
+	FileModTime int64  `json:"fileModTime,omitempty"` // Unix timestamp in milliseconds
+	ISRC        string `json:"isrc,omitempty"`
+	TrackNumber int    `json:"trackNumber,omitempty"`
+	DiscNumber  int    `json:"discNumber,omitempty"`
+	Duration    int    `json:"duration,omitempty"`
+	ReleaseDate string `json:"releaseDate,omitempty"`
+	BitDepth    int    `json:"bitDepth,omitempty"`
+	SampleRate  int    `json:"sampleRate,omitempty"`
+	Bitrate     int    `json:"bitrate,omitempty"` // kbps, for lossy formats (MP3, Opus, Vorbis)
+	Genre       string `json:"genre,omitempty"`
+	Format      string `json:"format,omitempty"`
+}
+
+type LibraryScanProgress struct {
+	TotalFiles   int     `json:"total_files"`
+	ScannedFiles int     `json:"scanned_files"`
+	CurrentFile  string  `json:"current_file"`
+	ErrorCount   int     `json:"error_count"`
+	ProgressPct  float64 `json:"progress_pct"`
+	IsComplete   bool    `json:"is_complete"`
+}
+
+// IncrementalScanResult contains results of an incremental library scan
+type IncrementalScanResult struct {
+	Scanned      []LibraryScanResult `json:"scanned"`      // New or updated files
+	DeletedPaths []string            `json:"deletedPaths"` // Files that no longer exist
+	SkippedCount int                 `json:"skippedCount"` // Files that were unchanged
+	TotalFiles   int                 `json:"totalFiles"`   // Total files in folder
+}
+
+var (
+	libraryScanProgress   LibraryScanProgress
+	libraryScanProgressMu sync.RWMutex
+	libraryScanCancel     chan struct{}
+	libraryScanCancelMu   sync.Mutex
+	libraryCoverCacheDir  string
+	libraryCoverCacheMu   sync.RWMutex
+)
+
+var supportedAudioFormats = map[string]bool{
+	".flac": true,
+	".m4a":  true,
+	".mp3":  true,
+	".opus": true,
+	".ogg":  true,
+}
+
+func SetLibraryCoverCacheDir(cacheDir string) {
+	libraryCoverCacheMu.Lock()
+	libraryCoverCacheDir = cacheDir
+	libraryCoverCacheMu.Unlock()
+}
+
+func ScanLibraryFolder(folderPath string) (string, error) {
+	if folderPath == "" {
+		return "[]", fmt.Errorf("folder path is empty")
+	}
+
+	info, err := os.Stat(folderPath)
+	if err != nil {
+		return "[]", fmt.Errorf("folder not found: %w", err)
+	}
+	if !info.IsDir() {
+		return "[]", fmt.Errorf("path is not a folder: %s", folderPath)
+	}
+
+	libraryScanProgressMu.Lock()
+	libraryScanProgress = LibraryScanProgress{}
+	libraryScanProgressMu.Unlock()
+
+	libraryScanCancelMu.Lock()
+	if libraryScanCancel != nil {
+		close(libraryScanCancel)
+	}
+	libraryScanCancel = make(chan struct{})
+	cancelCh := libraryScanCancel
+	libraryScanCancelMu.Unlock()
+
+	var audioFiles []string
+	err = filepath.Walk(folderPath, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return nil
+		}
+
+		select {
+		case <-cancelCh:
+			return fmt.Errorf("scan cancelled")
+		default:
+		}
+
+		if !info.IsDir() {
+			ext := strings.ToLower(filepath.Ext(path))
+			if supportedAudioFormats[ext] {
+				audioFiles = append(audioFiles, path)
+			}
+		}
+		return nil
+	})
+
+	if err != nil {
+		return "[]", err
+	}
+
+	totalFiles := len(audioFiles)
+	libraryScanProgressMu.Lock()
+	libraryScanProgress.TotalFiles = totalFiles
+	libraryScanProgressMu.Unlock()
+
+	if totalFiles == 0 {
+		libraryScanProgressMu.Lock()
+		libraryScanProgress.IsComplete = true
+		libraryScanProgressMu.Unlock()
+		return "[]", nil
+	}
+
+	GoLog("[LibraryScan] Found %d audio files to scan\n", totalFiles)
+
+	results := make([]LibraryScanResult, 0, totalFiles)
+	scanTime := time.Now().UTC().Format(time.RFC3339)
+	errorCount := 0
+
+	for i, filePath := range audioFiles {
+		select {
+		case <-cancelCh:
+			return "[]", fmt.Errorf("scan cancelled")
+		default:
+		}
+
+		libraryScanProgressMu.Lock()
+		libraryScanProgress.ScannedFiles = i + 1
+		libraryScanProgress.CurrentFile = filepath.Base(filePath)
+		libraryScanProgress.ProgressPct = float64(i+1) / float64(totalFiles) * 100
+		libraryScanProgressMu.Unlock()
+
+		result, err := scanAudioFile(filePath, scanTime)
+		if err != nil {
+			errorCount++
+			GoLog("[LibraryScan] Error scanning %s: %v\n", filePath, err)
+			continue
+		}
+
+		results = append(results, *result)
+	}
+
+	libraryScanProgressMu.Lock()
+	libraryScanProgress.ErrorCount = errorCount
+	libraryScanProgress.IsComplete = true
+	libraryScanProgressMu.Unlock()
+
+	GoLog("[LibraryScan] Scan complete: %d tracks found, %d errors\n", len(results), errorCount)
+
+	jsonBytes, err := json.Marshal(results)
+	if err != nil {
+		return "[]", fmt.Errorf("failed to marshal results: %w", err)
+	}
+
+	return string(jsonBytes), nil
+}
+
+func scanAudioFile(filePath, scanTime string) (*LibraryScanResult, error) {
+	ext := strings.ToLower(filepath.Ext(filePath))
+
+	result := &LibraryScanResult{
+		ID:        generateLibraryID(filePath),
+		FilePath:  filePath,
+		ScannedAt: scanTime,
+		Format:    strings.TrimPrefix(ext, "."),
+	}
+
+	// Get file modification time
+	if info, err := os.Stat(filePath); err == nil {
+		result.FileModTime = info.ModTime().UnixMilli()
+	}
+
+	libraryCoverCacheMu.RLock()
+	coverCacheDir := libraryCoverCacheDir
+	libraryCoverCacheMu.RUnlock()
+	if coverCacheDir != "" && ext != ".m4a" {
+		coverPath, err := SaveCoverToCache(filePath, coverCacheDir)
+		if err == nil && coverPath != "" {
+			result.CoverPath = coverPath
+		}
+	}
+
+	switch ext {
+	case ".flac":
+		return scanFLACFile(filePath, result)
+	case ".m4a":
+		return scanM4AFile(filePath, result)
+	case ".mp3":
+		return scanMP3File(filePath, result)
+	case ".opus", ".ogg":
+		return scanOggFile(filePath, result)
+	default:
+		return scanFromFilename(filePath, result)
+	}
+}
+
+func scanFLACFile(filePath string, result *LibraryScanResult) (*LibraryScanResult, error) {
+	metadata, err := ReadMetadata(filePath)
+	if err != nil {
+		return scanFromFilename(filePath, result)
+	}
+
+	result.TrackName = metadata.Title
+	result.ArtistName = metadata.Artist
+	result.AlbumName = metadata.Album
+	result.AlbumArtist = metadata.AlbumArtist
+	result.ISRC = metadata.ISRC
+	result.TrackNumber = metadata.TrackNumber
+	result.DiscNumber = metadata.DiscNumber
+	result.ReleaseDate = metadata.Date
+	result.Genre = metadata.Genre
+
+	quality, err := GetAudioQuality(filePath)
+	if err == nil {
+		result.BitDepth = quality.BitDepth
+		result.SampleRate = quality.SampleRate
+		if quality.SampleRate > 0 && quality.TotalSamples > 0 {
+			result.Duration = int(quality.TotalSamples / int64(quality.SampleRate))
+		}
+	}
+
+	if result.TrackName == "" {
+		result.TrackName = strings.TrimSuffix(filepath.Base(filePath), filepath.Ext(filePath))
+	}
+	if result.ArtistName == "" {
+		result.ArtistName = "Unknown Artist"
+	}
+	if result.AlbumName == "" {
+		result.AlbumName = "Unknown Album"
+	}
+
+	return result, nil
+}
+
+func scanM4AFile(filePath string, result *LibraryScanResult) (*LibraryScanResult, error) {
+	quality, err := GetM4AQuality(filePath)
+	if err == nil {
+		result.BitDepth = quality.BitDepth
+		result.SampleRate = quality.SampleRate
+	}
+
+	return scanFromFilename(filePath, result)
+}
+
+func scanMP3File(filePath string, result *LibraryScanResult) (*LibraryScanResult, error) {
+	metadata, err := ReadID3Tags(filePath)
+	if err != nil {
+		GoLog("[LibraryScan] ID3 read error for %s: %v\n", filePath, err)
+		return scanFromFilename(filePath, result)
+	}
+
+	result.TrackName = metadata.Title
+	result.ArtistName = metadata.Artist
+	result.AlbumName = metadata.Album
+	result.AlbumArtist = metadata.AlbumArtist
+	result.TrackNumber = metadata.TrackNumber
+	result.DiscNumber = metadata.DiscNumber
+	result.Genre = metadata.Genre
+	if metadata.Date != "" {
+		result.ReleaseDate = metadata.Date
+	} else {
+		result.ReleaseDate = metadata.Year
+	}
+	result.ISRC = metadata.ISRC
+
+	quality, err := GetMP3Quality(filePath)
+	if err == nil {
+		result.SampleRate = quality.SampleRate
+		result.BitDepth = quality.BitDepth // 0 for lossy
+		result.Duration = quality.Duration
+		if quality.Bitrate > 0 {
+			result.Bitrate = quality.Bitrate / 1000 // convert bps to kbps
+		}
+	}
+
+	if result.TrackName == "" {
+		result.TrackName = strings.TrimSuffix(filepath.Base(filePath), filepath.Ext(filePath))
+	}
+	if result.ArtistName == "" {
+		result.ArtistName = "Unknown Artist"
+	}
+	if result.AlbumName == "" {
+		result.AlbumName = "Unknown Album"
+	}
+
+	return result, nil
+}
+
+func scanOggFile(filePath string, result *LibraryScanResult) (*LibraryScanResult, error) {
+	metadata, err := ReadOggVorbisComments(filePath)
+	if err != nil {
+		GoLog("[LibraryScan] Ogg/Opus read error for %s: %v\n", filePath, err)
+		return scanFromFilename(filePath, result)
+	}
+
+	result.TrackName = metadata.Title
+	result.ArtistName = metadata.Artist
+	result.AlbumName = metadata.Album
+	result.AlbumArtist = metadata.AlbumArtist
+	result.ISRC = metadata.ISRC
+	result.TrackNumber = metadata.TrackNumber
+	result.DiscNumber = metadata.DiscNumber
+	result.Genre = metadata.Genre
+	result.ReleaseDate = metadata.Date
+
+	quality, err := GetOggQuality(filePath)
+	if err == nil {
+		result.SampleRate = quality.SampleRate
+		result.BitDepth = quality.BitDepth // 0 for lossy
+		result.Duration = quality.Duration
+		if quality.Bitrate > 0 {
+			result.Bitrate = quality.Bitrate / 1000 // convert bps to kbps
+		}
+	}
+
+	if result.TrackName == "" {
+		result.TrackName = strings.TrimSuffix(filepath.Base(filePath), filepath.Ext(filePath))
+	}
+	if result.ArtistName == "" {
+		result.ArtistName = "Unknown Artist"
+	}
+	if result.AlbumName == "" {
+		result.AlbumName = "Unknown Album"
+	}
+
+	return result, nil
+}
+
+func scanFromFilename(filePath string, result *LibraryScanResult) (*LibraryScanResult, error) {
+	filename := strings.TrimSuffix(filepath.Base(filePath), filepath.Ext(filePath))
+
+	parts := strings.SplitN(filename, " - ", 2)
+	if len(parts) == 2 {
+		if len(parts[0]) <= 3 && isNumeric(parts[0]) {
+			result.TrackName = parts[1]
+			result.ArtistName = "Unknown Artist"
+		} else {
+			result.ArtistName = parts[0]
+			result.TrackName = parts[1]
+		}
+	} else {
+		if len(filename) > 3 && isNumeric(filename[:2]) {
+			title := strings.TrimLeft(filename[2:], " .-")
+			result.TrackName = title
+		} else {
+			result.TrackName = filename
+		}
+		result.ArtistName = "Unknown Artist"
+	}
+
+	dir := filepath.Dir(filePath)
+	result.AlbumName = filepath.Base(dir)
+	if result.AlbumName == "." || result.AlbumName == "" {
+		result.AlbumName = "Unknown Album"
+	}
+
+	return result, nil
+}
+
+func isNumeric(s string) bool {
+	for _, c := range s {
+		if c < '0' || c > '9' {
+			return false
+		}
+	}
+	return len(s) > 0
+}
+
+func generateLibraryID(filePath string) string {
+	return fmt.Sprintf("lib_%x", hashString(filePath))
+}
+
+func hashString(s string) uint32 {
+	var hash uint32 = 5381
+	for _, c := range s {
+		hash = ((hash << 5) + hash) + uint32(c)
+	}
+	return hash
+}
+
+func GetLibraryScanProgress() string {
+	libraryScanProgressMu.RLock()
+	defer libraryScanProgressMu.RUnlock()
+
+	jsonBytes, _ := json.Marshal(libraryScanProgress)
+	return string(jsonBytes)
+}
+
+func CancelLibraryScan() {
+	libraryScanCancelMu.Lock()
+	defer libraryScanCancelMu.Unlock()
+
+	if libraryScanCancel != nil {
+		close(libraryScanCancel)
+		libraryScanCancel = nil
+	}
+}
+
+func ReadAudioMetadata(filePath string) (string, error) {
+	scanTime := time.Now().UTC().Format(time.RFC3339)
+	result, err := scanAudioFile(filePath, scanTime)
+	if err != nil {
+		return "", err
+	}
+
+	jsonBytes, err := json.Marshal(result)
+	if err != nil {
+		return "", fmt.Errorf("failed to marshal result: %w", err)
+	}
+
+	return string(jsonBytes), nil
+}
+
+// ScanLibraryFolderIncremental performs an incremental scan of the library folder
+// existingFilesJSON is a JSON object mapping filePath -> modTime (unix millis)
+// Only files that are new or have changed modification time will be scanned
+func ScanLibraryFolderIncremental(folderPath, existingFilesJSON string) (string, error) {
+	if folderPath == "" {
+		return "{}", fmt.Errorf("folder path is empty")
+	}
+
+	info, err := os.Stat(folderPath)
+	if err != nil {
+		return "{}", fmt.Errorf("folder not found: %w", err)
+	}
+	if !info.IsDir() {
+		return "{}", fmt.Errorf("path is not a folder: %s", folderPath)
+	}
+
+	// Parse existing files map
+	existingFiles := make(map[string]int64)
+	if existingFilesJSON != "" && existingFilesJSON != "{}" {
+		if err := json.Unmarshal([]byte(existingFilesJSON), &existingFiles); err != nil {
+			GoLog("[LibraryScan] Warning: failed to parse existing files JSON: %v\n", err)
+		}
+	}
+
+	GoLog("[LibraryScan] Incremental scan starting, %d existing files in database\n", len(existingFiles))
+
+	// Reset progress
+	libraryScanProgressMu.Lock()
+	libraryScanProgress = LibraryScanProgress{}
+	libraryScanProgressMu.Unlock()
+
+	// Setup cancellation
+	libraryScanCancelMu.Lock()
+	if libraryScanCancel != nil {
+		close(libraryScanCancel)
+	}
+	libraryScanCancel = make(chan struct{})
+	cancelCh := libraryScanCancel
+	libraryScanCancelMu.Unlock()
+
+	// Collect all audio files with their mod times
+	type fileInfo struct {
+		path    string
+		modTime int64
+	}
+	var currentFiles []fileInfo
+	currentPathSet := make(map[string]bool)
+
+	err = filepath.Walk(folderPath, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return nil
+		}
+
+		select {
+		case <-cancelCh:
+			return fmt.Errorf("scan cancelled")
+		default:
+		}
+
+		if !info.IsDir() {
+			ext := strings.ToLower(filepath.Ext(path))
+			if supportedAudioFormats[ext] {
+				currentFiles = append(currentFiles, fileInfo{
+					path:    path,
+					modTime: info.ModTime().UnixMilli(),
+				})
+				currentPathSet[path] = true
+			}
+		}
+		return nil
+	})
+
+	if err != nil {
+		return "{}", err
+	}
+
+	totalFiles := len(currentFiles)
+	libraryScanProgressMu.Lock()
+	libraryScanProgress.TotalFiles = totalFiles
+	libraryScanProgressMu.Unlock()
+
+	// Find files to scan (new or modified)
+	var filesToScan []fileInfo
+	skippedCount := 0
+
+	for _, f := range currentFiles {
+		existingModTime, exists := existingFiles[f.path]
+		if !exists {
+			// New file
+			filesToScan = append(filesToScan, f)
+		} else if f.modTime != existingModTime {
+			// Modified file
+			filesToScan = append(filesToScan, f)
+		} else {
+			// Unchanged file - skip
+			skippedCount++
+		}
+	}
+
+	// Find deleted files
+	var deletedPaths []string
+	for existingPath := range existingFiles {
+		if !currentPathSet[existingPath] {
+			deletedPaths = append(deletedPaths, existingPath)
+		}
+	}
+
+	GoLog("[LibraryScan] Incremental: %d to scan, %d skipped, %d deleted\n",
+		len(filesToScan), skippedCount, len(deletedPaths))
+
+	if len(filesToScan) == 0 {
+		libraryScanProgressMu.Lock()
+		libraryScanProgress.ScannedFiles = totalFiles
+		libraryScanProgress.IsComplete = true
+		libraryScanProgress.ProgressPct = 100
+		libraryScanProgressMu.Unlock()
+
+		result := IncrementalScanResult{
+			Scanned:      []LibraryScanResult{},
+			DeletedPaths: deletedPaths,
+			SkippedCount: skippedCount,
+			TotalFiles:   totalFiles,
+		}
+		jsonBytes, _ := json.Marshal(result)
+		return string(jsonBytes), nil
+	}
+
+	// Scan the files that need scanning
+	results := make([]LibraryScanResult, 0, len(filesToScan))
+	scanTime := time.Now().UTC().Format(time.RFC3339)
+	errorCount := 0
+
+	for i, f := range filesToScan {
+		select {
+		case <-cancelCh:
+			return "{}", fmt.Errorf("scan cancelled")
+		default:
+		}
+
+		libraryScanProgressMu.Lock()
+		libraryScanProgress.ScannedFiles = skippedCount + i + 1
+		libraryScanProgress.CurrentFile = filepath.Base(f.path)
+		libraryScanProgress.ProgressPct = float64(skippedCount+i+1) / float64(totalFiles) * 100
+		libraryScanProgressMu.Unlock()
+
+		result, err := scanAudioFile(f.path, scanTime)
+		if err != nil {
+			errorCount++
+			GoLog("[LibraryScan] Error scanning %s: %v\n", f.path, err)
+			continue
+		}
+
+		results = append(results, *result)
+	}
+
+	libraryScanProgressMu.Lock()
+	libraryScanProgress.ErrorCount = errorCount
+	libraryScanProgress.IsComplete = true
+	libraryScanProgress.ScannedFiles = totalFiles
+	libraryScanProgress.ProgressPct = 100
+	libraryScanProgressMu.Unlock()
+
+	GoLog("[LibraryScan] Incremental scan complete: %d scanned, %d skipped, %d deleted, %d errors\n",
+		len(results), skippedCount, len(deletedPaths), errorCount)
+
+	scanResult := IncrementalScanResult{
+		Scanned:      results,
+		DeletedPaths: deletedPaths,
+		SkippedCount: skippedCount,
+		TotalFiles:   totalFiles,
+	}
+
+	jsonBytes, err := json.Marshal(scanResult)
+	if err != nil {
+		return "{}", fmt.Errorf("failed to marshal results: %w", err)
+	}
+
+	return string(jsonBytes), nil
+}
@@ -3,6 +3,7 @@ package gobackend
 import (
 	"encoding/json"
 	"fmt"
+	"regexp"
 	"strings"
 	"sync"
 	"time"
@@ -22,30 +23,55 @@ type LogBuffer struct {
 	loggingEnabled bool
 }

+const (
+	defaultLogBufferSize = 500
+	maxLogMessageLength  = 500
+)
+
 var (
 	globalLogBuffer *LogBuffer
 	logBufferOnce   sync.Once
+
+	authorizationBearerPattern = regexp.MustCompile(`(?i)\bAuthorization\b\s*[:=]\s*Bearer\s+[A-Za-z0-9._~+/\-]+=*`)
+	genericKeyValuePattern     = regexp.MustCompile(`(?i)\b(access[_\s-]?token|refresh[_\s-]?token|id[_\s-]?token|client[_\s-]?secret|authorization|password|api[_\s-]?key)\b(\s*[:=]\s*)([^\s,;]+)`)
+	queryTokenPattern          = regexp.MustCompile(`(?i)([?&](?:access_token|refresh_token|id_token|token|client_secret|api_key|apikey|password)=)[^&\s]+`)
+	bearerTokenPattern         = regexp.MustCompile(`(?i)\bBearer\s+[A-Za-z0-9._~+/\-]+=*`)
 )

-// GetLogBuffer returns the singleton log buffer instance
+func sanitizeSensitiveLogText(message string) string {
+	redacted := message
+	redacted = authorizationBearerPattern.ReplaceAllString(redacted, "Authorization: Bearer [REDACTED]")
+	redacted = genericKeyValuePattern.ReplaceAllString(redacted, `${1}${2}[REDACTED]`)
+	redacted = queryTokenPattern.ReplaceAllString(redacted, `${1}[REDACTED]`)
+	redacted = bearerTokenPattern.ReplaceAllString(redacted, "Bearer [REDACTED]")
+	return redacted
+}
+
 func GetLogBuffer() *LogBuffer {
 	logBufferOnce.Do(func() {
 		globalLogBuffer = &LogBuffer{
-			entries:        make([]LogEntry, 0, 1000),
-			maxSize:        1000,
+			entries:        make([]LogEntry, 0, defaultLogBufferSize),
+			maxSize:        defaultLogBufferSize,
 			loggingEnabled: false, // Default: disabled for performance (user can enable in settings)
 		}
 	})
 	return globalLogBuffer
 }

+func truncateLogMessage(message string) string {
+	runes := []rune(message)
+	if len(runes) <= maxLogMessageLength {
+		return message
+	}
+	return string(runes[:maxLogMessageLength]) + "...[truncated]"
+}
+
 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()
@@ -60,6 +86,9 @@ func (lb *LogBuffer) Add(level, tag, message string) {
 		return
 	}

+	message = sanitizeSensitiveLogText(message)
+	message = truncateLogMessage(message)
+
 	entry := LogEntry{
 		Timestamp: time.Now().Format("15:04:05.000"),
 		Level:     level,
@@ -75,7 +104,6 @@ func (lb *LogBuffer) Add(level, tag, message string) {
 	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()
@@ -99,21 +127,18 @@ func (lb *LogBuffer) getSince(index int) ([]LogEntry, int) {
 	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...))
 }
@@ -163,15 +188,10 @@ func GoLog(format string, args ...interface{}) {
 	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)
@@ -179,17 +199,14 @@ func GetLogsSince(index int) string {
 	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)
 }
@@ -20,6 +20,140 @@ const (
 	durationToleranceSec = 10.0
 )

+// Lyrics provider names (used in settings and cascade ordering)
+const (
+	LyricsProviderLRCLIB     = "lrclib"
+	LyricsProviderNetease    = "netease"
+	LyricsProviderMusixmatch = "musixmatch"
+	LyricsProviderAppleMusic = "apple_music"
+	LyricsProviderQQMusic    = "qqmusic"
+)
+
+// DefaultLyricsProviders is the default cascade order for lyrics fetching.
+// LRCLIB first (no proxy dependency), then the others.
+var DefaultLyricsProviders = []string{
+	LyricsProviderLRCLIB,
+	LyricsProviderMusixmatch,
+	LyricsProviderNetease,
+	LyricsProviderAppleMusic,
+	LyricsProviderQQMusic,
+}
+
+// Global lyrics provider configuration
+var (
+	lyricsProvidersMu sync.RWMutex
+	lyricsProviders   []string // ordered list of enabled providers
+)
+
+// LyricsFetchOptions controls optional provider-specific enhancements.
+type LyricsFetchOptions struct {
+	IncludeTranslationNetease  bool   `json:"include_translation_netease"`
+	IncludeRomanizationNetease bool   `json:"include_romanization_netease"`
+	MultiPersonWordByWord      bool   `json:"multi_person_word_by_word"`
+	MusixmatchLanguage         string `json:"musixmatch_language,omitempty"`
+}
+
+var defaultLyricsFetchOptions = LyricsFetchOptions{
+	IncludeTranslationNetease:  false,
+	IncludeRomanizationNetease: false,
+	MultiPersonWordByWord:      true,
+	MusixmatchLanguage:         "",
+}
+
+var (
+	lyricsFetchOptionsMu sync.RWMutex
+	lyricsFetchOptions   = defaultLyricsFetchOptions
+)
+
+// SetLyricsProviderOrder sets the ordered list of lyrics providers to try.
+// Providers not in the list are disabled. An empty list resets to defaults.
+func SetLyricsProviderOrder(providers []string) {
+	lyricsProvidersMu.Lock()
+	defer lyricsProvidersMu.Unlock()
+
+	if len(providers) == 0 {
+		lyricsProviders = nil
+		return
+	}
+
+	// Validate provider names
+	validNames := map[string]bool{
+		LyricsProviderLRCLIB:     true,
+		LyricsProviderNetease:    true,
+		LyricsProviderMusixmatch: true,
+		LyricsProviderAppleMusic: true,
+		LyricsProviderQQMusic:    true,
+	}
+
+	var valid []string
+	for _, p := range providers {
+		normalized := strings.ToLower(strings.TrimSpace(p))
+		if validNames[normalized] {
+			valid = append(valid, normalized)
+		}
+	}
+
+	lyricsProviders = valid
+	GoLog("[Lyrics] Provider order set to: %v\n", valid)
+}
+
+// GetLyricsProviderOrder returns the current lyrics provider order.
+func GetLyricsProviderOrder() []string {
+	lyricsProvidersMu.RLock()
+	defer lyricsProvidersMu.RUnlock()
+
+	if len(lyricsProviders) == 0 {
+		return DefaultLyricsProviders
+	}
+
+	result := make([]string, len(lyricsProviders))
+	copy(result, lyricsProviders)
+	return result
+}
+
+// GetAvailableLyricsProviders returns metadata about all available providers.
+func GetAvailableLyricsProviders() []map[string]interface{} {
+	return []map[string]interface{}{
+		{"id": LyricsProviderLRCLIB, "name": "LRCLIB", "has_proxy_dependency": false, "description": "Open-source synced lyrics database"},
+		{"id": LyricsProviderNetease, "name": "Netease", "has_proxy_dependency": false, "description": "NetEase Cloud Music (good for Asian songs)"},
+		{"id": LyricsProviderMusixmatch, "name": "Musixmatch", "has_proxy_dependency": true, "description": "Largest lyrics database (multi-language)"},
+		{"id": LyricsProviderAppleMusic, "name": "Apple Music", "has_proxy_dependency": true, "description": "Word-by-word synced lyrics"},
+		{"id": LyricsProviderQQMusic, "name": "QQ Music", "has_proxy_dependency": true, "description": "QQ Music lyrics (good for Chinese songs)"},
+	}
+}
+
+func normalizeLyricsFetchOptions(opts LyricsFetchOptions) LyricsFetchOptions {
+	opts.MusixmatchLanguage = strings.ToLower(strings.TrimSpace(opts.MusixmatchLanguage))
+	opts.MusixmatchLanguage = regexp.MustCompile(`[^a-z0-9\-_]`).ReplaceAllString(opts.MusixmatchLanguage, "")
+	if len(opts.MusixmatchLanguage) > 16 {
+		opts.MusixmatchLanguage = opts.MusixmatchLanguage[:16]
+	}
+	return opts
+}
+
+// SetLyricsFetchOptions sets provider-specific lyric fetch behavior.
+func SetLyricsFetchOptions(opts LyricsFetchOptions) {
+	normalized := normalizeLyricsFetchOptions(opts)
+
+	lyricsFetchOptionsMu.Lock()
+	defer lyricsFetchOptionsMu.Unlock()
+	lyricsFetchOptions = normalized
+
+	GoLog("[Lyrics] Fetch options set: translation=%v romanization=%v multi_person=%v musixmatch_lang=%q\n",
+		normalized.IncludeTranslationNetease,
+		normalized.IncludeRomanizationNetease,
+		normalized.MultiPersonWordByWord,
+		normalized.MusixmatchLanguage,
+	)
+}
+
+// GetLyricsFetchOptions returns current provider-specific lyric fetch behavior.
+func GetLyricsFetchOptions() LyricsFetchOptions {
+	lyricsFetchOptionsMu.RLock()
+	defer lyricsFetchOptionsMu.RUnlock()
+	return lyricsFetchOptions
+}
+
 type lyricsCacheEntry struct {
 	response  *LyricsResponse
 	expiresAt time.Time
@@ -90,6 +224,15 @@ func (c *lyricsCache) Size() int {
 	return len(c.cache)
 }

+func (c *lyricsCache) ClearAll() int {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	cleared := len(c.cache)
+	c.cache = make(map[string]*lyricsCacheEntry)
+	return cleared
+}
+
 type LRCLibResponse struct {
 	ID           int     `json:"id"`
 	Name         string  `json:"name"`
@@ -139,7 +282,7 @@ func (c *LyricsClient) FetchLyricsWithMetadata(artist, track string) (*LyricsRes
 	if err != nil {
 		return nil, fmt.Errorf("failed to create request: %w", err)
 	}
-	req.Header.Set("User-Agent", "SpotiFLAC-Android/1.0")
+	req.Header.Set("User-Agent", getRandomUserAgent())

 	resp, err := c.httpClient.Do(req)
 	if err != nil {
@@ -174,7 +317,7 @@ func (c *LyricsClient) FetchLyricsFromLRCLibSearch(query string, durationSec flo
 	if err != nil {
 		return nil, fmt.Errorf("failed to create request: %w", err)
 	}
-	req.Header.Set("User-Agent", "SpotiFLAC-Android/1.0")
+	req.Header.Set("User-Agent", getRandomUserAgent())

 	resp, err := c.httpClient.Do(req)
 	if err != nil {
@@ -240,68 +383,203 @@ func (c *LyricsClient) durationMatches(lrcDuration, targetDuration float64) bool

 func (c *LyricsClient) FetchLyricsAllSources(spotifyID, trackName, artistName string, durationSec float64) (*LyricsResponse, error) {
 	primaryArtist := normalizeArtistName(artistName)
+	fetchOptions := GetLyricsFetchOptions()

+	extManager := GetExtensionManager()
+	var extensionProviders []*ExtensionProviderWrapper
+	if extManager != nil {
+		extensionProviders = extManager.GetLyricsProviders()
+	}
+
+	var cachedNonExtension *LyricsResponse
 	if cached, found := globalLyricsCache.Get(artistName, trackName, durationSec); found {
-		fmt.Printf("[Lyrics] Cache hit for: %s - %s\n", artistName, trackName)
-		cachedCopy := *cached
-		cachedCopy.Source = cached.Source + " (cached)"
+		isExtensionCache := strings.HasPrefix(cached.Source, "Extension:")
+		if len(extensionProviders) == 0 || isExtensionCache {
+			fmt.Printf("[Lyrics] Cache hit for: %s - %s\n", artistName, trackName)
+			cachedCopy := *cached
+			cachedCopy.Source = cached.Source + " (cached)"
+			return &cachedCopy, nil
+		}
+
+		// If extension providers are currently enabled, don't let stale built-in cache
+		// mask newly installed/activated extensions.
+		cachedNonExtension = cached
+		GoLog("[Lyrics] Ignoring cached non-extension lyrics because extension providers are available\n")
+	}
+
+	isValidResult := func(l *LyricsResponse) bool {
+		return lyricsHasUsableText(l)
+	}
+
+	// Try extension lyrics providers first
+	if len(extensionProviders) > 0 {
+		for _, provider := range extensionProviders {
+			GoLog("[Lyrics] Trying extension lyrics provider: %s\n", provider.extension.ID)
+			lyrics, err := provider.FetchLyrics(trackName, artistName, "", durationSec)
+			if err == nil && isValidResult(lyrics) {
+				GoLog("[Lyrics] Got lyrics from extension: %s\n", provider.extension.ID)
+				globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
+				return lyrics, nil
+			}
+			if err != nil {
+				GoLog("[Lyrics] Extension %s failed: %v\n", provider.extension.ID, err)
+			}
+		}
+	}
+
+	if cachedNonExtension != nil {
+		cachedCopy := *cachedNonExtension
+		cachedCopy.Source = cachedNonExtension.Source + " (cached fallback)"
+		GoLog("[Lyrics] Extension providers unavailable for this track, using cached built-in lyrics\n")
 		return &cachedCopy, nil
 	}

-	var lyrics *LyricsResponse
-	var err error
-
-	isValidResult := func(l *LyricsResponse) bool {
-		return l != nil && (len(l.Lines) > 0 || l.Instrumental)
-	}
-
-	lyrics, err = c.FetchLyricsWithMetadata(primaryArtist, trackName)
-	if err == nil && isValidResult(lyrics) {
-		lyrics.Source = "LRCLIB"
-		globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
-		return lyrics, nil
-	}
-
-	if primaryArtist != artistName {
-		lyrics, err = c.FetchLyricsWithMetadata(artistName, trackName)
-		if err == nil && isValidResult(lyrics) {
-			lyrics.Source = "LRCLIB"
-			globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
-			return lyrics, nil
-		}
-	}
-
+	// Get configured provider order
+	providerOrder := GetLyricsProviderOrder()
 	simplifiedTrack := simplifyTrackName(trackName)
-	if simplifiedTrack != trackName {
-		lyrics, err = c.FetchLyricsWithMetadata(primaryArtist, simplifiedTrack)
+
+	GoLog("[Lyrics] Searching for: %s - %s (providers: %v)\n", artistName, trackName, providerOrder)
+
+	// Cascade through all configured built-in providers
+	for _, providerName := range providerOrder {
+		GoLog("[Lyrics] Trying provider: %s\n", providerName)
+
+		var lyrics *LyricsResponse
+		var err error
+
+		switch providerName {
+		case LyricsProviderLRCLIB:
+			lyrics, err = c.tryLRCLIB(primaryArtist, artistName, trackName, simplifiedTrack, durationSec)
+
+		case LyricsProviderNetease:
+			neteaseClient := NewNeteaseClient()
+			lyrics, err = neteaseClient.FetchLyrics(
+				trackName,
+				primaryArtist,
+				durationSec,
+				fetchOptions.IncludeTranslationNetease,
+				fetchOptions.IncludeRomanizationNetease,
+			)
+			if err != nil && primaryArtist != artistName {
+				lyrics, err = neteaseClient.FetchLyrics(
+					trackName,
+					artistName,
+					durationSec,
+					fetchOptions.IncludeTranslationNetease,
+					fetchOptions.IncludeRomanizationNetease,
+				)
+			}
+			if err != nil && simplifiedTrack != trackName {
+				lyrics, err = neteaseClient.FetchLyrics(
+					simplifiedTrack,
+					primaryArtist,
+					durationSec,
+					fetchOptions.IncludeTranslationNetease,
+					fetchOptions.IncludeRomanizationNetease,
+				)
+			}
+
+		case LyricsProviderMusixmatch:
+			musixmatchClient := NewMusixmatchClient()
+			lyrics, err = musixmatchClient.FetchLyrics(
+				trackName,
+				primaryArtist,
+				durationSec,
+				fetchOptions.MusixmatchLanguage,
+			)
+			if err != nil && primaryArtist != artistName {
+				lyrics, err = musixmatchClient.FetchLyrics(
+					trackName,
+					artistName,
+					durationSec,
+					fetchOptions.MusixmatchLanguage,
+				)
+			}
+
+		case LyricsProviderAppleMusic:
+			appleClient := NewAppleMusicClient()
+			lyrics, err = appleClient.FetchLyrics(trackName, primaryArtist, durationSec, fetchOptions.MultiPersonWordByWord)
+			if err != nil && primaryArtist != artistName {
+				lyrics, err = appleClient.FetchLyrics(trackName, artistName, durationSec, fetchOptions.MultiPersonWordByWord)
+			}
+
+		case LyricsProviderQQMusic:
+			qqClient := NewQQMusicClient()
+			lyrics, err = qqClient.FetchLyrics(trackName, primaryArtist, durationSec, fetchOptions.MultiPersonWordByWord)
+			if err != nil && primaryArtist != artistName {
+				lyrics, err = qqClient.FetchLyrics(trackName, artistName, durationSec, fetchOptions.MultiPersonWordByWord)
+			}
+
+		default:
+			GoLog("[Lyrics] Unknown provider: %s, skipping\n", providerName)
+			continue
+		}
+
 		if err == nil && isValidResult(lyrics) {
-			lyrics.Source = "LRCLIB (simplified)"
+			GoLog("[Lyrics] Got lyrics from: %s\n", providerName)
 			globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
 			return lyrics, nil
 		}
-	}

-	query := primaryArtist + " " + trackName
-	lyrics, err = c.FetchLyricsFromLRCLibSearch(query, durationSec)
-	if err == nil && isValidResult(lyrics) {
-		lyrics.Source = "LRCLIB Search"
-		globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
-		return lyrics, nil
-	}
-
-	if simplifiedTrack != trackName {
-		query = primaryArtist + " " + simplifiedTrack
-		lyrics, err = c.FetchLyricsFromLRCLibSearch(query, durationSec)
-		if err == nil && isValidResult(lyrics) {
-			lyrics.Source = "LRCLIB Search (simplified)"
-			globalLyricsCache.Set(artistName, trackName, durationSec, lyrics)
-			return lyrics, nil
+		if err != nil {
+			GoLog("[Lyrics] Provider %s failed: %v\n", providerName, err)
 		}
 	}

 	return nil, fmt.Errorf("lyrics not found from any source")
 }

+// tryLRCLIB attempts all LRCLIB search strategies (exact match, simplified, search).
+func (c *LyricsClient) tryLRCLIB(primaryArtist, artistName, trackName, simplifiedTrack string, durationSec float64) (*LyricsResponse, error) {
+	var lyrics *LyricsResponse
+	var err error
+
+	// 1. Exact match with primary artist
+	lyrics, err = c.FetchLyricsWithMetadata(primaryArtist, trackName)
+	if err == nil && lyrics != nil && (len(lyrics.Lines) > 0 || lyrics.Instrumental) {
+		lyrics.Source = "LRCLIB"
+		return lyrics, nil
+	}
+
+	// 2. Exact match with full artist name
+	if primaryArtist != artistName {
+		lyrics, err = c.FetchLyricsWithMetadata(artistName, trackName)
+		if err == nil && lyrics != nil && (len(lyrics.Lines) > 0 || lyrics.Instrumental) {
+			lyrics.Source = "LRCLIB"
+			return lyrics, nil
+		}
+	}
+
+	// 3. Simplified track name
+	if simplifiedTrack != trackName {
+		lyrics, err = c.FetchLyricsWithMetadata(primaryArtist, simplifiedTrack)
+		if err == nil && lyrics != nil && (len(lyrics.Lines) > 0 || lyrics.Instrumental) {
+			lyrics.Source = "LRCLIB (simplified)"
+			return lyrics, nil
+		}
+	}
+
+	// 4. Search by query
+	query := primaryArtist + " " + trackName
+	lyrics, err = c.FetchLyricsFromLRCLibSearch(query, durationSec)
+	if err == nil && lyrics != nil && (len(lyrics.Lines) > 0 || lyrics.Instrumental) {
+		lyrics.Source = "LRCLIB Search"
+		return lyrics, nil
+	}
+
+	// 5. Search with simplified track name
+	if simplifiedTrack != trackName {
+		query = primaryArtist + " " + simplifiedTrack
+		lyrics, err = c.FetchLyricsFromLRCLibSearch(query, durationSec)
+		if err == nil && lyrics != nil && (len(lyrics.Lines) > 0 || lyrics.Instrumental) {
+			lyrics.Source = "LRCLIB Search (simplified)"
+			return lyrics, nil
+		}
+	}
+
+	return nil, fmt.Errorf("LRCLIB: no lyrics found")
+}
+
 func (c *LyricsClient) parseLRCLibResponse(resp *LRCLibResponse) *LyricsResponse {
 	result := &LyricsResponse{
 		Instrumental: resp.Instrumental,
@@ -339,10 +617,20 @@ func parseSyncedLyrics(syncedLyrics string) []LyricsLine {
 			continue
 		}

+		// Preserve Apple/QQ background vocal tags by attaching them to
+		// the previous timed line. This keeps [bg:...] in final exported LRC.
+		if strings.HasPrefix(line, "[bg:") && len(lines) > 0 {
+			lines[len(lines)-1].Words = strings.TrimSpace(lines[len(lines)-1].Words + "\n" + line)
+			continue
+		}
+
 		matches := lrcPattern.FindStringSubmatch(line)
 		if len(matches) == 5 {
 			startMs := lrcTimestampToMs(matches[1], matches[2], matches[3])
 			words := strings.TrimSpace(matches[4])
+			if words == "" {
+				continue
+			}

 			lines = append(lines, LyricsLine{
 				StartTimeMs: startMs,
@@ -363,6 +651,63 @@ func parseSyncedLyrics(syncedLyrics string) []LyricsLine {
 	return lines
 }

+func lyricsHasUsableText(lyrics *LyricsResponse) bool {
+	if lyrics == nil {
+		return false
+	}
+	if lyrics.Instrumental {
+		return true
+	}
+	if strings.TrimSpace(lyrics.PlainLyrics) != "" {
+		return true
+	}
+	for _, line := range lyrics.Lines {
+		if strings.TrimSpace(line.Words) != "" {
+			return true
+		}
+	}
+	return false
+}
+
+// detectLyricsErrorPayload extracts human-readable error messages from
+// JSON payloads returned by lyrics proxies when no lyric is available.
+func detectLyricsErrorPayload(raw string) (string, bool) {
+	trimmed := strings.TrimSpace(raw)
+	if trimmed == "" || !strings.HasPrefix(trimmed, "{") {
+		return "", false
+	}
+
+	var payload map[string]interface{}
+	if err := json.Unmarshal([]byte(trimmed), &payload); err != nil {
+		return "", false
+	}
+
+	lyricsKeys := []string{"lyrics", "lyric", "lrc", "content", "lines", "syncedLyrics", "unsyncedLyrics"}
+	hasLyricsKey := false
+	for _, key := range lyricsKeys {
+		if _, ok := payload[key]; ok {
+			hasLyricsKey = true
+			break
+		}
+	}
+
+	errorKeys := []string{"message", "error", "detail", "reason"}
+	for _, key := range errorKeys {
+		if msg, ok := payload[key].(string); ok {
+			msg = strings.TrimSpace(msg)
+			if msg != "" && !hasLyricsKey {
+				return msg, true
+			}
+		}
+	}
+
+	if success, ok := payload["success"].(bool); ok && !success && !hasLyricsKey {
+		return "request unsuccessful", true
+	}
+
+	return "", false
+}
+
 func lrcTimestampToMs(minutes, seconds, centiseconds string) int64 {
 	min, _ := strconv.ParseInt(minutes, 10, 64)
 	sec, _ := strconv.ParseInt(seconds, 10, 64)
@@ -376,12 +721,16 @@ func lrcTimestampToMs(minutes, seconds, centiseconds string) int64 {
 }

 func msToLRCTimestamp(ms int64) string {
+	return fmt.Sprintf("[%s]", msToLRCTimestampInline(ms))
+}
+
+func msToLRCTimestampInline(ms int64) string {
 	totalSeconds := ms / 1000
 	minutes := totalSeconds / 60
 	seconds := totalSeconds % 60
 	centiseconds := (ms % 1000) / 10

-	return fmt.Sprintf("[%02d:%02d.%02d]", minutes, seconds, centiseconds)
+	return fmt.Sprintf("%02d:%02d.%02d", minutes, seconds, centiseconds)
 }

 func convertToLRCWithMetadata(lyrics *LyricsResponse, trackName, artistName string) string {
@@ -0,0 +1,381 @@
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"regexp"
+	"strings"
+	"sync"
+	"time"
+)
+
+// AppleMusicClient fetches lyrics from Apple Music.
+// Uses a scraped JWT token for search and a proxy for lyrics.
+type AppleMusicClient struct {
+	httpClient *http.Client
+}
+
+// Apple Music token manager — singleton with mutex for thread safety
+type appleTokenManager struct {
+	mu    sync.Mutex
+	token string
+}
+
+var globalAppleTokenManager = &appleTokenManager{}
+
+func (m *appleTokenManager) getToken(client *http.Client) (string, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	if m.token != "" {
+		return m.token, nil
+	}
+
+	// Step 1: Fetch the Apple Music beta page
+	req, err := http.NewRequest("GET", "https://beta.music.apple.com", nil)
+	if err != nil {
+		return "", fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("failed to fetch Apple Music page: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read Apple Music page: %w", err)
+	}
+
+	// Step 2: Find the index JS file URL
+	indexJsRegex := regexp.MustCompile(`/assets/index~[^/]+\.js`)
+	match := indexJsRegex.Find(body)
+	if match == nil {
+		return "", fmt.Errorf("could not find index JS script URL on Apple Music page")
+	}
+
+	indexJsURL := "https://beta.music.apple.com" + string(match)
+
+	// Step 3: Fetch the JS file
+	jsReq, err := http.NewRequest("GET", indexJsURL, nil)
+	if err != nil {
+		return "", fmt.Errorf("failed to create JS request: %w", err)
+	}
+	jsReq.Header.Set("User-Agent", getRandomUserAgent())
+
+	jsResp, err := client.Do(jsReq)
+	if err != nil {
+		return "", fmt.Errorf("failed to fetch Apple Music JS: %w", err)
+	}
+	defer jsResp.Body.Close()
+
+	jsBody, err := io.ReadAll(jsResp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read Apple Music JS: %w", err)
+	}
+
+	// Step 4: Extract JWT token (starts with eyJh)
+	tokenRegex := regexp.MustCompile(`eyJh[^"]*`)
+	tokenMatch := tokenRegex.Find(jsBody)
+	if tokenMatch == nil {
+		return "", fmt.Errorf("could not find JWT token in Apple Music JS")
+	}
+
+	m.token = string(tokenMatch)
+	GoLog("[AppleMusic] Token obtained successfully (length: %d)\n", len(m.token))
+	return m.token, nil
+}
+
+func (m *appleTokenManager) clearToken() {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.token = ""
+}
+
+// Apple Music API response models
+type appleMusicSearchResponse struct {
+	Results struct {
+		Songs *struct {
+			Data []struct {
+				ID   string `json:"id"`
+				Type string `json:"type"`
+			} `json:"data"`
+		} `json:"songs"`
+	} `json:"results"`
+	Resources *struct {
+		Songs map[string]struct {
+			Attributes struct {
+				Name       string `json:"name"`
+				ArtistName string `json:"artistName"`
+				AlbumName  string `json:"albumName"`
+				URL        string `json:"url"`
+				Artwork    struct {
+					URL string `json:"url"`
+				} `json:"artwork"`
+			} `json:"attributes"`
+		} `json:"songs"`
+	} `json:"resources"`
+}
+
+// PaxResponse represents the lyrics proxy response for word-by-word / line lyrics
+type paxResponse struct {
+	Type    string      `json:"type"`    // "Syllable" or "Line"
+	Content []paxLyrics `json:"content"` // List of lyric lines
+}
+
+type paxLyrics struct {
+	Text           []paxLyricDetail `json:"text"`
+	Timestamp      int              `json:"timestamp"`
+	OppositeTurn   bool             `json:"oppositeTurn"`
+	Background     bool             `json:"background"`
+	BackgroundText []paxLyricDetail `json:"backgroundText"`
+	EndTime        int              `json:"endtime"`
+}
+
+type paxLyricDetail struct {
+	Text      string `json:"text"`
+	Part      bool   `json:"part"`
+	Timestamp *int   `json:"timestamp"`
+	EndTime   *int   `json:"endtime"`
+}
+
+func NewAppleMusicClient() *AppleMusicClient {
+	return &AppleMusicClient{
+		httpClient: NewMetadataHTTPClient(20 * time.Second),
+	}
+}
+
+// SearchSong searches for a song on Apple Music and returns its ID.
+func (c *AppleMusicClient) SearchSong(trackName, artistName string) (string, error) {
+	query := trackName + " " + artistName
+	if strings.TrimSpace(query) == "" {
+		return "", fmt.Errorf("empty search query")
+	}
+
+	token, err := globalAppleTokenManager.getToken(c.httpClient)
+	if err != nil {
+		return "", fmt.Errorf("apple music token error: %w", err)
+	}
+
+	encodedQuery := url.QueryEscape(query)
+	searchURL := fmt.Sprintf(
+		"https://amp-api.music.apple.com/v1/catalog/us/search?term=%s&types=songs&limit=5&l=en-US&platform=web&format[resources]=map&include[songs]=artists&extend=artistUrl",
+		encodedQuery,
+	)
+
+	req, err := http.NewRequest("GET", searchURL, nil)
+	if err != nil {
+		return "", fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Authorization", "Bearer "+token)
+	req.Header.Set("Origin", "https://music.apple.com")
+	req.Header.Set("Referer", "https://music.apple.com/")
+	req.Header.Set("User-Agent", getRandomUserAgent())
+	req.Header.Set("Accept", "application/json")
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("apple music search failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == 401 {
+		globalAppleTokenManager.clearToken()
+		return "", fmt.Errorf("apple music token expired")
+	}
+
+	if resp.StatusCode != 200 {
+		return "", fmt.Errorf("apple music search returned HTTP %d", resp.StatusCode)
+	}
+
+	var searchResp appleMusicSearchResponse
+	if err := json.NewDecoder(resp.Body).Decode(&searchResp); err != nil {
+		return "", fmt.Errorf("failed to decode apple music response: %w", err)
+	}
+
+	if searchResp.Results.Songs == nil || len(searchResp.Results.Songs.Data) == 0 {
+		return "", fmt.Errorf("no songs found on apple music")
+	}
+
+	return searchResp.Results.Songs.Data[0].ID, nil
+}
+
+// FetchLyricsByID fetches lyrics from the paxsenix proxy using Apple Music song ID.
+func (c *AppleMusicClient) FetchLyricsByID(songID string) (string, error) {
+	lyricsURL := fmt.Sprintf("https://lyrics.paxsenix.org/apple-music/lyrics?id=%s", songID)
+
+	req, err := http.NewRequest("GET", lyricsURL, nil)
+	if err != nil {
+		return "", fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("apple music lyrics fetch failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return "", fmt.Errorf("apple music lyrics proxy returned HTTP %d", resp.StatusCode)
+	}
+
+	bodyBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read lyrics response: %w", err)
+	}
+
+	bodyStr := strings.TrimSpace(string(bodyBytes))
+	if bodyStr == "" {
+		return "", fmt.Errorf("empty lyrics response from apple music")
+	}
+
+	return bodyStr, nil
+}
+
+// formatPaxLyricsToLRC converts a pax proxy response to standard LRC format.
+func formatPaxLyricsToLRC(rawJSON string, multiPersonWordByWord bool) (string, error) {
+	// Try to parse as PaxResponse first
+	var paxResp paxResponse
+	if err := json.Unmarshal([]byte(rawJSON), &paxResp); err == nil && paxResp.Content != nil {
+		return formatPaxContent(paxResp.Type, paxResp.Content, multiPersonWordByWord), nil
+	}
+
+	// Try to parse as a direct list of PaxLyrics
+	var directLyrics []paxLyrics
+	if err := json.Unmarshal([]byte(rawJSON), &directLyrics); err == nil && len(directLyrics) > 0 {
+		return formatPaxContent("Syllable", directLyrics, multiPersonWordByWord), nil
+	}
+
+	return "", fmt.Errorf("failed to parse pax lyrics response")
+}
+
+func appendPaxLyricDetail(builder *strings.Builder, details []paxLyricDetail) {
+	lastStart := ""
+
+	for _, syllable := range details {
+		if syllable.Timestamp != nil {
+			start := fmt.Sprintf("<%s>", msToLRCTimestampInline(int64(*syllable.Timestamp)))
+			if start != lastStart {
+				builder.WriteString(start)
+				lastStart = start
+			}
+		}
+
+		builder.WriteString(syllable.Text)
+		if !syllable.Part {
+			builder.WriteString(" ")
+		}
+
+		if syllable.EndTime != nil {
+			builder.WriteString(fmt.Sprintf("<%s>", msToLRCTimestampInline(int64(*syllable.EndTime))))
+		}
+	}
+}
+
+func formatPaxContent(lyricsType string, content []paxLyrics, multiPersonWordByWord bool) string {
+	var sb strings.Builder
+
+	for i, line := range content {
+		if i > 0 {
+			sb.WriteString("\n")
+		}
+
+		timestamp := msToLRCTimestamp(int64(line.Timestamp))
+
+		if strings.EqualFold(lyricsType, "Syllable") {
+			sb.WriteString(timestamp)
+			if multiPersonWordByWord {
+				if line.OppositeTurn {
+					sb.WriteString("v2:")
+				} else {
+					sb.WriteString("v1:")
+				}
+			}
+
+			appendPaxLyricDetail(&sb, line.Text)
+
+			if line.Background && multiPersonWordByWord && len(line.BackgroundText) > 0 {
+				sb.WriteString("\n[bg:")
+				appendPaxLyricDetail(&sb, line.BackgroundText)
+				sb.WriteString("]")
+			}
+		} else {
+			if len(line.Text) > 0 {
+				sb.WriteString(timestamp)
+				sb.WriteString(line.Text[0].Text)
+			}
+		}
+	}
+
+	return strings.TrimSpace(sb.String())
+}
+
+// FetchLyrics searches Apple Music and returns parsed LyricsResponse.
+func (c *AppleMusicClient) FetchLyrics(
+	trackName,
+	artistName string,
+	durationSec float64,
+	multiPersonWordByWord bool,
+) (*LyricsResponse, error) {
+	songID, err := c.SearchSong(trackName, artistName)
+	if err != nil {
+		return nil, err
+	}
+
+	rawLyrics, err := c.FetchLyricsByID(songID)
+	if err != nil {
+		return nil, err
+	}
+	if errMsg, isErrorPayload := detectLyricsErrorPayload(rawLyrics); isErrorPayload {
+		return nil, fmt.Errorf("apple music proxy returned non-lyric payload: %s", errMsg)
+	}
+
+	// Try to parse as pax format (word-by-word or line)
+	lrcText, err := formatPaxLyricsToLRC(rawLyrics, multiPersonWordByWord)
+	if err != nil {
+		// If pax parsing fails, try to parse as direct LRC text
+		lrcText = rawLyrics
+	}
+
+	lines := parseSyncedLyrics(lrcText)
+	if len(lines) > 0 {
+		return &LyricsResponse{
+			Lines:    lines,
+			SyncType: "LINE_SYNCED",
+			Provider: "Apple Music",
+			Source:   "Apple Music",
+		}, nil
+	}
+
+	// Fall back to plain text if no timestamps found
+	plainLines := strings.Split(lrcText, "\n")
+	var resultLines []LyricsLine
+	for _, line := range plainLines {
+		trimmed := strings.TrimSpace(line)
+		if trimmed != "" {
+			resultLines = append(resultLines, LyricsLine{
+				StartTimeMs: 0,
+				Words:       trimmed,
+				EndTimeMs:   0,
+			})
+		}
+	}
+
+	if len(resultLines) > 0 {
+		return &LyricsResponse{
+			Lines:    resultLines,
+			SyncType: "UNSYNCED",
+			Provider: "Apple Music",
+			Source:   "Apple Music",
+		}, nil
+	}
+
+	return nil, fmt.Errorf("no lyrics found on apple music")
+}
@@ -0,0 +1,214 @@
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+)
+
+// MusixmatchClient fetches lyrics from Musixmatch via a proxy server.
+// The proxy handles Musixmatch authentication internally.
+type MusixmatchClient struct {
+	httpClient *http.Client
+	baseURL    string
+}
+
+// Musixmatch proxy response models
+type musixmatchSearchResponse struct {
+	ID                 int64                     `json:"id"`
+	SongName           string                    `json:"songName"`
+	ArtistName         string                    `json:"artistName"`
+	AlbumName          string                    `json:"albumName"`
+	Artwork            string                    `json:"artwork"`
+	ReleaseDate        string                    `json:"releaseDate"`
+	Duration           int                       `json:"duration"`
+	URL                string                    `json:"url"`
+	AlbumID            int64                     `json:"albumId"`
+	HasSyncedLyrics    bool                      `json:"hasSyncedLyrics"`
+	HasUnsyncedLyrics  bool                      `json:"hasUnsyncedLyrics"`
+	AvailableLanguages []string                  `json:"availableLanguages"`
+	OriginalLanguage   string                    `json:"originalLanguage"`
+	SyncedLyrics       *musixmatchLyricsResponse `json:"syncedLyrics"`
+	UnsyncedLyrics     *musixmatchLyricsResponse `json:"unsyncedLyrics"`
+}
+
+type musixmatchLyricsResponse struct {
+	ID          int64  `json:"id"`
+	Duration    int    `json:"duration"`
+	Language    string `json:"language"`
+	UpdatedTime string `json:"updatedTime"`
+	Lyrics      string `json:"lyrics"`
+}
+
+func NewMusixmatchClient() *MusixmatchClient {
+	return &MusixmatchClient{
+		httpClient: NewMetadataHTTPClient(15 * time.Second),
+		baseURL:    "http://158.180.60.95",
+	}
+}
+
+// searchAndGetLyrics searches for a song and retrieves its lyrics in one call.
+// The Musixmatch proxy returns both search result and lyrics in a single response.
+func (c *MusixmatchClient) searchAndGetLyrics(trackName, artistName string) (*musixmatchSearchResponse, error) {
+	if strings.TrimSpace(trackName) == "" || strings.TrimSpace(artistName) == "" {
+		return nil, fmt.Errorf("empty track or artist name")
+	}
+
+	encodedArtist := url.QueryEscape(artistName)
+	encodedTrack := url.QueryEscape(trackName)
+
+	fullURL := fmt.Sprintf("%s/v2/full?artist=%s&track=%s", c.baseURL, encodedArtist, encodedTrack)
+
+	req, err := http.NewRequest("GET", fullURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("musixmatch search failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("musixmatch proxy returned HTTP %d", resp.StatusCode)
+	}
+
+	var result musixmatchSearchResponse
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return nil, fmt.Errorf("failed to decode musixmatch response: %w", err)
+	}
+
+	return &result, nil
+}
+
+// FetchLyricsInLanguage retrieves lyrics from Musixmatch for a specific language code.
+func (c *MusixmatchClient) FetchLyricsInLanguage(songID int64, language string) (*LyricsResponse, error) {
+	lang := strings.ToLower(strings.TrimSpace(language))
+	if songID <= 0 || lang == "" {
+		return nil, fmt.Errorf("invalid song id or language")
+	}
+
+	fullURL := fmt.Sprintf("%s/v2/full?id=%d&lang=%s", c.baseURL, songID, url.QueryEscape(lang))
+
+	req, err := http.NewRequest("GET", fullURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("musixmatch language fetch failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("musixmatch language endpoint returned HTTP %d", resp.StatusCode)
+	}
+
+	var result musixmatchSearchResponse
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return nil, fmt.Errorf("failed to decode musixmatch language response: %w", err)
+	}
+
+	// Prefer synced lyrics for selected language
+	if result.SyncedLyrics != nil && strings.TrimSpace(result.SyncedLyrics.Lyrics) != "" {
+		lines := parseSyncedLyrics(result.SyncedLyrics.Lyrics)
+		if len(lines) > 0 {
+			return &LyricsResponse{
+				Lines:    lines,
+				SyncType: "LINE_SYNCED",
+				Provider: "Musixmatch",
+				Source:   fmt.Sprintf("Musixmatch (%s)", lang),
+			}, nil
+		}
+	}
+
+	// Fall back to unsynced lyrics for selected language
+	if result.UnsyncedLyrics != nil && strings.TrimSpace(result.UnsyncedLyrics.Lyrics) != "" {
+		var lines []LyricsLine
+		for _, line := range strings.Split(result.UnsyncedLyrics.Lyrics, "\n") {
+			trimmed := strings.TrimSpace(line)
+			if trimmed != "" {
+				lines = append(lines, LyricsLine{
+					StartTimeMs: 0,
+					Words:       trimmed,
+					EndTimeMs:   0,
+				})
+			}
+		}
+
+		if len(lines) > 0 {
+			return &LyricsResponse{
+				Lines:       lines,
+				SyncType:    "UNSYNCED",
+				PlainLyrics: result.UnsyncedLyrics.Lyrics,
+				Provider:    "Musixmatch",
+				Source:      fmt.Sprintf("Musixmatch (%s)", lang),
+			}, nil
+		}
+	}
+
+	return nil, fmt.Errorf("no lyrics found on musixmatch for language %s", lang)
+}
+
+// FetchLyrics searches Musixmatch and returns parsed LyricsResponse.
+func (c *MusixmatchClient) FetchLyrics(trackName, artistName string, durationSec float64, preferredLanguage string) (*LyricsResponse, error) {
+	result, err := c.searchAndGetLyrics(trackName, artistName)
+	if err != nil {
+		return nil, err
+	}
+
+	if preferred := strings.ToLower(strings.TrimSpace(preferredLanguage)); preferred != "" && result.ID > 0 {
+		localized, localizedErr := c.FetchLyricsInLanguage(result.ID, preferred)
+		if localizedErr == nil {
+			return localized, nil
+		}
+		GoLog("[Musixmatch] Language override '%s' failed: %v\n", preferred, localizedErr)
+	}
+
+	// Prefer synced lyrics
+	if result.SyncedLyrics != nil && strings.TrimSpace(result.SyncedLyrics.Lyrics) != "" {
+		lines := parseSyncedLyrics(result.SyncedLyrics.Lyrics)
+		if len(lines) > 0 {
+			return &LyricsResponse{
+				Lines:    lines,
+				SyncType: "LINE_SYNCED",
+				Provider: "Musixmatch",
+				Source:   "Musixmatch",
+			}, nil
+		}
+	}
+
+	// Fall back to unsynced lyrics
+	if result.UnsyncedLyrics != nil && strings.TrimSpace(result.UnsyncedLyrics.Lyrics) != "" {
+		var lines []LyricsLine
+		for _, line := range strings.Split(result.UnsyncedLyrics.Lyrics, "\n") {
+			trimmed := strings.TrimSpace(line)
+			if trimmed != "" {
+				lines = append(lines, LyricsLine{
+					StartTimeMs: 0,
+					Words:       trimmed,
+					EndTimeMs:   0,
+				})
+			}
+		}
+
+		if len(lines) > 0 {
+			return &LyricsResponse{
+				Lines:       lines,
+				SyncType:    "UNSYNCED",
+				PlainLyrics: result.UnsyncedLyrics.Lyrics,
+				Provider:    "Musixmatch",
+				Source:      "Musixmatch",
+			}, nil
+		}
+	}
+
+	return nil, fmt.Errorf("no lyrics found on musixmatch")
+}
@@ -0,0 +1,209 @@
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+)
+
+// NeteaseClient fetches lyrics from NetEase Cloud Music (music.163.com).
+// This is a direct public API — no proxy dependency.
+type NeteaseClient struct {
+	httpClient *http.Client
+}
+
+// Netease API response models
+type neteaseSearchResponse struct {
+	Result struct {
+		Songs []struct {
+			Name    string `json:"name"`
+			ID      int64  `json:"id"`
+			Artists []struct {
+				Name string `json:"name"`
+			} `json:"artists"`
+		} `json:"songs"`
+		SongCount int `json:"songCount"`
+	} `json:"result"`
+	Code int `json:"code"`
+}
+
+type neteaseLyricsResponse struct {
+	LRC     *neteaseLyricField `json:"lrc"`
+	TLyric  *neteaseLyricField `json:"tlyric"`
+	RomaLRC *neteaseLyricField `json:"romalrc"`
+	Code    int                `json:"code"`
+}
+
+type neteaseLyricField struct {
+	Lyric string `json:"lyric"`
+}
+
+var neteaseHeaders = map[string]string{
+	"Accept":          "application/json",
+	"Accept-Language": "en-US,en;q=0.9",
+	"Cache-Control":   "max-age=0",
+}
+
+func NewNeteaseClient() *NeteaseClient {
+	return &NeteaseClient{
+		httpClient: NewMetadataHTTPClient(15 * time.Second),
+	}
+}
+
+// SearchSong searches for a song on Netease and returns the song ID.
+func (c *NeteaseClient) SearchSong(trackName, artistName string) (int64, error) {
+	query := trackName + " " + artistName
+	if strings.TrimSpace(query) == "" {
+		return 0, fmt.Errorf("empty search query")
+	}
+
+	searchURL := "http://music.163.com/api/search/pc"
+	params := url.Values{}
+	params.Set("s", query)
+	params.Set("type", "1")
+	params.Set("limit", "1")
+	params.Set("offset", "0")
+
+	fullURL := searchURL + "?" + params.Encode()
+
+	req, err := http.NewRequest("GET", fullURL, nil)
+	if err != nil {
+		return 0, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	for k, v := range neteaseHeaders {
+		req.Header.Set(k, v)
+	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return 0, fmt.Errorf("netease search failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return 0, fmt.Errorf("netease search returned HTTP %d", resp.StatusCode)
+	}
+
+	var searchResp neteaseSearchResponse
+	if err := json.NewDecoder(resp.Body).Decode(&searchResp); err != nil {
+		return 0, fmt.Errorf("failed to decode netease search: %w", err)
+	}
+
+	if searchResp.Result.SongCount == 0 || len(searchResp.Result.Songs) == 0 {
+		return 0, fmt.Errorf("no songs found on netease")
+	}
+
+	return searchResp.Result.Songs[0].ID, nil
+}
+
+// FetchLyricsByID fetches synced lyrics for a given Netease song ID.
+func (c *NeteaseClient) FetchLyricsByID(songID int64, includeTranslation, includeRomanization bool) (string, error) {
+	lyricsURL := "http://music.163.com/api/song/lyric"
+	params := url.Values{}
+	params.Set("id", fmt.Sprintf("%d", songID))
+	params.Set("lv", "1")
+	params.Set("tv", "1")
+	params.Set("rv", "1")
+
+	fullURL := lyricsURL + "?" + params.Encode()
+
+	req, err := http.NewRequest("GET", fullURL, nil)
+	if err != nil {
+		return "", fmt.Errorf("failed to create request: %w", err)
+	}
+
+	for k, v := range neteaseHeaders {
+		req.Header.Set(k, v)
+	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("netease lyrics fetch failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return "", fmt.Errorf("netease lyrics returned HTTP %d", resp.StatusCode)
+	}
+
+	var lyricsResp neteaseLyricsResponse
+	if err := json.NewDecoder(resp.Body).Decode(&lyricsResp); err != nil {
+		return "", fmt.Errorf("failed to decode netease lyrics: %w", err)
+	}
+
+	if lyricsResp.LRC == nil || strings.TrimSpace(lyricsResp.LRC.Lyric) == "" {
+		return "", fmt.Errorf("no lyrics available on netease")
+	}
+
+	lyric := lyricsResp.LRC.Lyric
+
+	if includeTranslation && lyricsResp.TLyric != nil && strings.TrimSpace(lyricsResp.TLyric.Lyric) != "" {
+		lyric += "\n\n" + lyricsResp.TLyric.Lyric
+	}
+
+	if includeRomanization && lyricsResp.RomaLRC != nil && strings.TrimSpace(lyricsResp.RomaLRC.Lyric) != "" {
+		lyric += "\n\n" + lyricsResp.RomaLRC.Lyric
+	}
+
+	return lyric, nil
+}
+
+// FetchLyrics searches for a track and returns parsed LyricsResponse.
+func (c *NeteaseClient) FetchLyrics(
+	trackName,
+	artistName string,
+	durationSec float64,
+	includeTranslation,
+	includeRomanization bool,
+) (*LyricsResponse, error) {
+	songID, err := c.SearchSong(trackName, artistName)
+	if err != nil {
+		return nil, err
+	}
+
+	lrcText, err := c.FetchLyricsByID(songID, includeTranslation, includeRomanization)
+	if err != nil {
+		return nil, err
+	}
+
+	// Parse the LRC text into LyricsResponse
+	lines := parseSyncedLyrics(lrcText)
+	if len(lines) == 0 {
+		// May be plain text lyrics without timestamps
+		plainLines := strings.Split(lrcText, "\n")
+		for _, line := range plainLines {
+			trimmed := strings.TrimSpace(line)
+			if trimmed != "" {
+				lines = append(lines, LyricsLine{
+					StartTimeMs: 0,
+					Words:       trimmed,
+					EndTimeMs:   0,
+				})
+			}
+		}
+
+		if len(lines) == 0 {
+			return nil, fmt.Errorf("netease returned empty lyrics")
+		}
+
+		return &LyricsResponse{
+			Lines:    lines,
+			SyncType: "UNSYNCED",
+			Provider: "Netease",
+			Source:   "Netease",
+		}, nil
+	}
+
+	return &LyricsResponse{
+		Lines:    lines,
+		SyncType: "LINE_SYNCED",
+		Provider: "Netease",
+		Source:   "Netease",
+	}, nil
+}
@@ -0,0 +1,211 @@
+package gobackend
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+)
+
+// QQMusicClient fetches lyrics from QQ Music.
+// Search uses public QQ Music API, lyrics use the paxsenix proxy.
+type QQMusicClient struct {
+	httpClient *http.Client
+}
+
+// QQ Music search response models
+type qqMusicSearchResponse struct {
+	Data struct {
+		Song struct {
+			List []struct {
+				Title  string `json:"title"`
+				Singer []struct {
+					Name string `json:"name"`
+				} `json:"singer"`
+				Album struct {
+					Name string `json:"name"`
+				} `json:"album"`
+				ID int64 `json:"id"`
+			} `json:"list"`
+		} `json:"song"`
+	} `json:"data"`
+}
+
+// QQ Music lyrics request payload for paxsenix proxy
+type qqLyricsPayload struct {
+	Artist []string `json:"artist"`
+	Album  string   `json:"album"`
+	ID     int64    `json:"id"`
+	Title  string   `json:"title"`
+}
+
+func NewQQMusicClient() *QQMusicClient {
+	return &QQMusicClient{
+		httpClient: NewMetadataHTTPClient(15 * time.Second),
+	}
+}
+
+// searchSong searches QQ Music and returns the song info needed for lyrics fetch.
+func (c *QQMusicClient) searchSong(trackName, artistName string) (*qqLyricsPayload, error) {
+	query := trackName + " " + artistName
+	if strings.TrimSpace(query) == "" {
+		return nil, fmt.Errorf("empty search query")
+	}
+
+	searchURL := "https://c.y.qq.com/soso/fcgi-bin/client_search_cp"
+	params := url.Values{}
+	params.Set("format", "json")
+	params.Set("inCharset", "utf8")
+	params.Set("outCharset", "utf8")
+	params.Set("platform", "yqq.json")
+	params.Set("new_json", "1")
+	params.Set("w", query)
+
+	fullURL := searchURL + "?" + params.Encode()
+
+	req, err := http.NewRequest("GET", fullURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("qqmusic search failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("qqmusic search returned HTTP %d", resp.StatusCode)
+	}
+
+	var searchResp qqMusicSearchResponse
+	if err := json.NewDecoder(resp.Body).Decode(&searchResp); err != nil {
+		return nil, fmt.Errorf("failed to decode qqmusic response: %w", err)
+	}
+
+	if len(searchResp.Data.Song.List) == 0 {
+		return nil, fmt.Errorf("no songs found on qqmusic")
+	}
+
+	song := searchResp.Data.Song.List[0]
+
+	var artists []string
+	for _, singer := range song.Singer {
+		artists = append(artists, singer.Name)
+	}
+
+	return &qqLyricsPayload{
+		Artist: artists,
+		Album:  song.Album.Name,
+		ID:     song.ID,
+		Title:  song.Title,
+	}, nil
+}
+
+// fetchLyricsByPayload fetches lyrics from the paxsenix proxy using QQ Music song info.
+func (c *QQMusicClient) fetchLyricsByPayload(payload *qqLyricsPayload) (string, error) {
+	lyricsURL := "https://paxsenix.alwaysdata.net/getQQLyrics.php"
+
+	payloadBytes, err := json.Marshal(payload)
+	if err != nil {
+		return "", fmt.Errorf("failed to marshal payload: %w", err)
+	}
+
+	req, err := http.NewRequest("POST", lyricsURL, bytes.NewReader(payloadBytes))
+	if err != nil {
+		return "", fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("User-Agent", getRandomUserAgent())
+
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("qqmusic lyrics fetch failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return "", fmt.Errorf("qqmusic lyrics proxy returned HTTP %d", resp.StatusCode)
+	}
+
+	bodyBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read lyrics response: %w", err)
+	}
+
+	bodyStr := strings.TrimSpace(string(bodyBytes))
+	if bodyStr == "" {
+		return "", fmt.Errorf("empty lyrics response from qqmusic")
+	}
+
+	return bodyStr, nil
+}
+
+// FetchLyrics searches QQ Music and returns parsed LyricsResponse.
+func (c *QQMusicClient) FetchLyrics(
+	trackName,
+	artistName string,
+	durationSec float64,
+	multiPersonWordByWord bool,
+) (*LyricsResponse, error) {
+	payload, err := c.searchSong(trackName, artistName)
+	if err != nil {
+		return nil, err
+	}
+
+	rawLyrics, err := c.fetchLyricsByPayload(payload)
+	if err != nil {
+		return nil, err
+	}
+	if errMsg, isErrorPayload := detectLyricsErrorPayload(rawLyrics); isErrorPayload {
+		return nil, fmt.Errorf("qqmusic proxy returned non-lyric payload: %s", errMsg)
+	}
+
+	// Try to parse as pax format (word-by-word or line)
+	lrcText, err := formatPaxLyricsToLRC(rawLyrics, multiPersonWordByWord)
+	if err != nil {
+		// If pax parsing fails, try to use as direct LRC text
+		lrcText = rawLyrics
+	}
+
+	lines := parseSyncedLyrics(lrcText)
+	if len(lines) > 0 {
+		return &LyricsResponse{
+			Lines:    lines,
+			SyncType: "LINE_SYNCED",
+			Provider: "QQ Music",
+			Source:   "QQ Music",
+		}, nil
+	}
+
+	// Fall back to plain text
+	plainLines := strings.Split(lrcText, "\n")
+	var resultLines []LyricsLine
+	for _, line := range plainLines {
+		trimmed := strings.TrimSpace(line)
+		if trimmed != "" {
+			resultLines = append(resultLines, LyricsLine{
+				StartTimeMs: 0,
+				Words:       trimmed,
+				EndTimeMs:   0,
+			})
+		}
+	}
+
+	if len(resultLines) > 0 {
+		return &LyricsResponse{
+			Lines:    resultLines,
+			SyncType: "UNSYNCED",
+			Provider: "QQ Music",
+			Source:   "QQ Music",
+		}, nil
+	}
+
+	return nil, fmt.Errorf("no lyrics found on qqmusic")
+}
@@ -4,16 +4,97 @@ import (
 	"bytes"
 	"encoding/binary"
 	"fmt"
+	stdimage "image"
+	_ "image/gif"
+	_ "image/jpeg"
+	_ "image/png"
 	"io"
 	"os"
+	"path/filepath"
 	"strconv"
 	"strings"

-	"github.com/go-flac/flacpicture"
-	"github.com/go-flac/flacvorbis"
-	"github.com/go-flac/go-flac"
+	"github.com/go-flac/flacpicture/v2"
+	"github.com/go-flac/flacvorbis/v2"
+	"github.com/go-flac/go-flac/v2"
 )

+func detectCoverMIME(coverPath string, coverData []byte) string {
+	// Prefer magic-byte detection over file extension.
+	// Some providers return non-JPEG data behind .jpg URLs.
+	if len(coverData) >= 8 &&
+		coverData[0] == 0x89 &&
+		coverData[1] == 0x50 &&
+		coverData[2] == 0x4E &&
+		coverData[3] == 0x47 &&
+		coverData[4] == 0x0D &&
+		coverData[5] == 0x0A &&
+		coverData[6] == 0x1A &&
+		coverData[7] == 0x0A {
+		return "image/png"
+	}
+	if len(coverData) >= 3 &&
+		coverData[0] == 0xFF &&
+		coverData[1] == 0xD8 &&
+		coverData[2] == 0xFF {
+		return "image/jpeg"
+	}
+	if len(coverData) >= 6 {
+		header := string(coverData[:6])
+		if header == "GIF87a" || header == "GIF89a" {
+			return "image/gif"
+		}
+	}
+	if len(coverData) >= 12 &&
+		string(coverData[:4]) == "RIFF" &&
+		string(coverData[8:12]) == "WEBP" {
+		return "image/webp"
+	}
+
+	switch strings.ToLower(filepath.Ext(strings.TrimSpace(coverPath))) {
+	case ".png":
+		return "image/png"
+	case ".jpg", ".jpeg":
+		return "image/jpeg"
+	case ".webp":
+		return "image/webp"
+	case ".gif":
+		return "image/gif"
+	}
+
+	return "image/jpeg"
+}
+
+func buildPictureBlock(coverPath string, coverData []byte) (flac.MetaDataBlock, error) {
+	if len(coverData) == 0 {
+		return flac.MetaDataBlock{}, fmt.Errorf("empty cover data")
+	}
+
+	mime := detectCoverMIME(coverPath, coverData)
+	picture := &flacpicture.MetadataBlockPicture{
+		PictureType: flacpicture.PictureTypeFrontCover,
+		MIME:        mime,
+		Description: "Front Cover",
+		ImageData:   coverData,
+	}
+
+	// Width/height/depth are optional in practice; keep zero when decode fails.
+	if cfg, format, err := stdimage.DecodeConfig(bytes.NewReader(coverData)); err == nil {
+		picture.Width = uint32(cfg.Width)
+		picture.Height = uint32(cfg.Height)
+		switch format {
+		case "png":
+			picture.ColorDepth = 32
+		case "jpeg":
+			picture.ColorDepth = 24
+		default:
+			picture.ColorDepth = 0
+		}
+	}
+
+	return picture.Marshal(), nil
+}
+
 type Metadata struct {
 	Title       string
 	Artist      string
@@ -29,6 +110,8 @@ type Metadata struct {
 	Genre       string
 	Label       string
 	Copyright   string
+	Composer    string
+	Comment     string
 }

 func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
@@ -98,6 +181,14 @@ func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
 		setComment(cmt, "COPYRIGHT", metadata.Copyright)
 	}

+	if metadata.Composer != "" {
+		setComment(cmt, "COMPOSER", metadata.Composer)
+	}
+
+	if metadata.Comment != "" {
+		setComment(cmt, "COMMENT", metadata.Comment)
+	}
+
 	cmtBlock := cmt.Marshal()
 	if cmtIdx >= 0 {
 		f.Meta[cmtIdx] = &cmtBlock
@@ -117,19 +208,12 @@ func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
 					}
 				}

-				picture, err := flacpicture.NewFromImageData(
-					flacpicture.PictureTypeFrontCover,
-					"Front Cover",
-					coverData,
-					"image/jpeg",
-				)
+				picBlock, err := buildPictureBlock(coverPath, coverData)
 				if err != nil {
-					fmt.Printf("[Metadata] Warning: Failed to create picture block: %v\n", err)
-				} else {
-					picBlock := picture.Marshal()
-					f.Meta = append(f.Meta, &picBlock)
-					fmt.Printf("[Metadata] Cover art embedded successfully (%d bytes)\n", len(coverData))
+					return fmt.Errorf("failed to create picture block: %w", err)
 				}
+				f.Meta = append(f.Meta, &picBlock)
+				fmt.Printf("[Metadata] Cover art embedded successfully (%d bytes)\n", len(coverData))
 			}
 		} else {
 			fmt.Printf("[Metadata] Warning: Cover file does not exist: %s\n", coverPath)
@@ -206,6 +290,14 @@ func EmbedMetadataWithCoverData(filePath string, metadata Metadata, coverData []
 		setComment(cmt, "COPYRIGHT", metadata.Copyright)
 	}

+	if metadata.Composer != "" {
+		setComment(cmt, "COMPOSER", metadata.Composer)
+	}
+
+	if metadata.Comment != "" {
+		setComment(cmt, "COMMENT", metadata.Comment)
+	}
+
 	cmtBlock := cmt.Marshal()
 	if cmtIdx >= 0 {
 		f.Meta[cmtIdx] = &cmtBlock
@@ -220,19 +312,12 @@ func EmbedMetadataWithCoverData(filePath string, metadata Metadata, coverData []
 			}
 		}

-		picture, err := flacpicture.NewFromImageData(
-			flacpicture.PictureTypeFrontCover,
-			"Front Cover",
-			coverData,
-			"image/jpeg",
-		)
+		picBlock, err := buildPictureBlock("", coverData)
 		if err != nil {
-			fmt.Printf("[Metadata] Warning: Failed to create picture block: %v\n", err)
-		} else {
-			picBlock := picture.Marshal()
-			f.Meta = append(f.Meta, &picBlock)
-			fmt.Printf("[Metadata] Cover art embedded successfully (%d bytes)\n", len(coverData))
+			return fmt.Errorf("failed to create picture block: %w", err)
 		}
+		f.Meta = append(f.Meta, &picBlock)
+		fmt.Printf("[Metadata] Cover art embedded successfully (%d bytes)\n", len(coverData))
 	}

 	return f.Save(filePath)
@@ -292,6 +377,12 @@ func ReadMetadata(filePath string) (*Metadata, error) {
 				metadata.Date = getComment(cmt, "YEAR")
 			}

+			metadata.Genre = getComment(cmt, "GENRE")
+			metadata.Label = getComment(cmt, "ORGANIZATION")
+			metadata.Copyright = getComment(cmt, "COPYRIGHT")
+			metadata.Composer = getComment(cmt, "COMPOSER")
+			metadata.Comment = getComment(cmt, "COMMENT")
+
 			break
 		}
 	}
@@ -451,33 +542,91 @@ func EmbedGenreLabel(filePath string, genre, label string) error {
 }

 func ExtractLyrics(filePath string) (string, error) {
+	lower := strings.ToLower(filePath)
+
+	if strings.HasSuffix(lower, ".flac") {
+		return extractLyricsFromFlac(filePath)
+	}
+
+	if strings.HasSuffix(lower, ".mp3") {
+		meta, err := ReadID3Tags(filePath)
+		if err != nil || meta == nil {
+			return "", fmt.Errorf("no lyrics found in file")
+		}
+		if strings.TrimSpace(meta.Lyrics) != "" {
+			return meta.Lyrics, nil
+		}
+		if looksLikeEmbeddedLyrics(meta.Comment) {
+			return meta.Comment, nil
+		}
+		return "", fmt.Errorf("no lyrics found in file")
+	}
+
+	if strings.HasSuffix(lower, ".opus") || strings.HasSuffix(lower, ".ogg") {
+		meta, err := ReadOggVorbisComments(filePath)
+		if err != nil || meta == nil {
+			return "", fmt.Errorf("no lyrics found in file")
+		}
+		if strings.TrimSpace(meta.Lyrics) != "" {
+			return meta.Lyrics, nil
+		}
+		if looksLikeEmbeddedLyrics(meta.Comment) {
+			return meta.Comment, nil
+		}
+		return "", fmt.Errorf("no lyrics found in file")
+	}
+
+	return "", fmt.Errorf("unsupported file format for lyrics extraction")
+}
+
+func extractLyricsFromFlac(filePath string) (string, error) {
 	f, err := flac.ParseFile(filePath)
 	if err != nil {
 		return "", fmt.Errorf("failed to parse FLAC file: %w", err)
 	}

 	for _, meta := range f.Meta {
-		if meta.Type == flac.VorbisComment {
-			cmt, err := flacvorbis.ParseFromMetaDataBlock(*meta)
-			if err != nil {
-				continue
-			}
+		if meta.Type != flac.VorbisComment {
+			continue
+		}

-			lyrics, err := cmt.Get("LYRICS")
-			if err == nil && len(lyrics) > 0 && lyrics[0] != "" {
-				return lyrics[0], nil
-			}
+		cmt, err := flacvorbis.ParseFromMetaDataBlock(*meta)
+		if err != nil {
+			continue
+		}

-			lyrics, err = cmt.Get("UNSYNCEDLYRICS")
-			if err == nil && len(lyrics) > 0 && lyrics[0] != "" {
-				return lyrics[0], nil
-			}
+		lyrics, err := cmt.Get("LYRICS")
+		if err == nil && len(lyrics) > 0 && strings.TrimSpace(lyrics[0]) != "" {
+			return lyrics[0], nil
+		}
+
+		lyrics, err = cmt.Get("UNSYNCEDLYRICS")
+		if err == nil && len(lyrics) > 0 && strings.TrimSpace(lyrics[0]) != "" {
+			return lyrics[0], nil
 		}
 	}

 	return "", fmt.Errorf("no lyrics found in file")
 }

+func looksLikeEmbeddedLyrics(value string) bool {
+	trimmed := strings.TrimSpace(value)
+	if trimmed == "" {
+		return false
+	}
+
+	lower := strings.ToLower(trimmed)
+	if strings.Contains(lower, "[ar:") || strings.Contains(lower, "[ti:") {
+		return true
+	}
+
+	if strings.Contains(trimmed, "\n") && strings.Contains(trimmed, "[") && strings.Contains(trimmed, "]") {
+		return true
+	}
+
+	return false
+}
+
 type AudioQuality struct {
 	BitDepth     int   `json:"bit_depth"`
 	SampleRate   int   `json:"sample_rate"`
@@ -0,0 +1,31 @@
+package gobackend
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+func isFDOutput(outputFD int) bool {
+	return outputFD > 0
+}
+
+func openOutputForWrite(outputPath string, outputFD int) (*os.File, error) {
+	if isFDOutput(outputFD) {
+		return os.NewFile(uintptr(outputFD), fmt.Sprintf("saf_fd_%d", outputFD)), nil
+	}
+	return os.Create(outputPath)
+}
+
+func cleanupOutputOnError(outputPath string, outputFD int) {
+	if isFDOutput(outputFD) {
+		return
+	}
+
+	path := strings.TrimSpace(outputPath)
+	if path == "" || strings.HasPrefix(path, "/proc/self/fd/") {
+		return
+	}
+
+	_ = os.Remove(path)
+}
@@ -1,6 +1,7 @@
 package gobackend

 import (
+	"encoding/json"
 	"fmt"
 	"sync"
 	"time"
@@ -9,7 +10,7 @@ import (
 type TrackIDCacheEntry struct {
 	TidalTrackID  int64
 	QobuzTrackID  int64
-	AmazonTrackID string
+	AmazonURL     string
 	ExpiresAt     time.Time
 }

@@ -106,7 +107,7 @@ func (c *TrackIDCache) SetQobuz(isrc string, trackID int64) {
 	}
 }

-func (c *TrackIDCache) SetAmazon(isrc string, trackID string) {
+func (c *TrackIDCache) SetAmazonURL(isrc string, amazonURL string) {
 	c.mu.Lock()
 	defer c.mu.Unlock()

@@ -115,7 +116,7 @@ func (c *TrackIDCache) SetAmazon(isrc string, trackID string) {
 		entry = &TrackIDCacheEntry{}
 		c.cache[isrc] = entry
 	}
-	entry.AmazonTrackID = trackID
+	entry.AmazonURL = amazonURL
 	now := time.Now()
 	entry.ExpiresAt = now.Add(c.ttl)

@@ -156,17 +157,20 @@ func FetchCoverAndLyricsParallel(
 ) *ParallelDownloadResult {
 	result := &ParallelDownloadResult{}
 	var wg sync.WaitGroup
+	var resultMu sync.Mutex

 	if coverURL != "" {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
 			data, err := downloadCoverToMemory(coverURL, maxQualityCover)
+			resultMu.Lock()
 			if err != nil {
 				result.CoverErr = err
 			} else {
 				result.CoverData = data
 			}
+			resultMu.Unlock()
 		}()
 	}

@@ -177,6 +181,7 @@ func FetchCoverAndLyricsParallel(
 			client := NewLyricsClient()
 			durationSec := float64(durationMs) / 1000.0
 			lyrics, err := client.FetchLyricsAllSources(spotifyID, trackName, artistName, durationSec)
+			resultMu.Lock()
 			if err != nil {
 				result.LyricsErr = err
 			} else if lyrics != nil && len(lyrics.Lines) > 0 {
@@ -185,6 +190,7 @@ func FetchCoverAndLyricsParallel(
 			} else {
 				result.LyricsErr = fmt.Errorf("no lyrics found")
 			}
+			resultMu.Unlock()
 		}()
 	}

@@ -211,6 +217,9 @@ func PreWarmTrackCache(requests []PreWarmCacheRequest) {
 	var wg sync.WaitGroup

 	for _, req := range requests {
+		if req.ISRC == "" {
+			continue
+		}
 		if cached := cache.Get(req.ISRC); cached != nil {
 			continue
 		}
@@ -225,7 +234,7 @@ func PreWarmTrackCache(requests []PreWarmCacheRequest) {
 			case "tidal":
 				preWarmTidalCache(r.ISRC, r.TrackName, r.ArtistName)
 			case "qobuz":
-				preWarmQobuzCache(r.ISRC)
+				preWarmQobuzCache(r.ISRC, r.SpotifyID)
 			case "amazon":
 				preWarmAmazonCache(r.ISRC, r.SpotifyID)
 			}
@@ -243,10 +252,30 @@ func preWarmTidalCache(isrc, _, _ string) {
 	}
 }

-func preWarmQobuzCache(isrc string) {
+// preWarmQobuzCache tries to get Qobuz Track ID in the following order:
+// 1. From SongLink (fast, no Qobuz API call needed)
+// 2. Direct ISRC search on Qobuz API (slower, may fail if ISRC not in Qobuz database)
+func preWarmQobuzCache(isrc, spotifyID string) {
+	// First, try to get QobuzID from SongLink - this is faster and more reliable
+	if spotifyID != "" {
+		client := NewSongLinkClient()
+		availability, err := client.CheckTrackAvailability(spotifyID, isrc)
+		if err == nil && availability != nil && availability.QobuzID != "" {
+			// Parse QobuzID to int64
+			var trackID int64
+			if _, parseErr := fmt.Sscanf(availability.QobuzID, "%d", &trackID); parseErr == nil && trackID > 0 {
+				GoLog("[Qobuz] Pre-warm cache: Got Qobuz ID %d from SongLink for ISRC %s\n", trackID, isrc)
+				GetTrackIDCache().SetQobuz(isrc, trackID)
+				return
+			}
+		}
+	}
+
+	// Fallback: Direct ISRC search on Qobuz API
 	downloader := NewQobuzDownloader()
 	track, err := downloader.SearchTrackByISRC(isrc)
 	if err == nil && track != nil {
+		GoLog("[Qobuz] Pre-warm cache: Got Qobuz ID %d from direct ISRC search for %s\n", track.ID, isrc)
 		GetTrackIDCache().SetQobuz(isrc, track.ID)
 	}
 }
@@ -254,13 +283,34 @@ func preWarmQobuzCache(isrc string) {
 func preWarmAmazonCache(isrc, spotifyID string) {
 	client := NewSongLinkClient()
 	availability, err := client.CheckTrackAvailability(spotifyID, isrc)
-	if err == nil && availability != nil && availability.Amazon {
-		GetTrackIDCache().SetAmazon(isrc, availability.AmazonURL)
+	if err == nil && availability != nil && availability.AmazonURL != "" {
+		GetTrackIDCache().SetAmazonURL(isrc, availability.AmazonURL)
 	}
 }

 func PreWarmCache(tracksJSON string) error {
-	var requests []PreWarmCacheRequest
+	var tracks []struct {
+		ISRC       string `json:"isrc"`
+		TrackName  string `json:"track_name"`
+		ArtistName string `json:"artist_name"`
+		SpotifyID  string `json:"spotify_id"`
+		Service    string `json:"service"`
+	}
+
+	if err := json.Unmarshal([]byte(tracksJSON), &tracks); err != nil {
+		return fmt.Errorf("failed to parse tracks JSON: %w", err)
+	}
+
+	requests := make([]PreWarmCacheRequest, len(tracks))
+	for i, t := range tracks {
+		requests[i] = PreWarmCacheRequest{
+			ISRC:       t.ISRC,
+			TrackName:  t.TrackName,
+			ArtistName: t.ArtistName,
+			SpotifyID:  t.SpotifyID,
+			Service:    t.Service,
+		}
+	}

 	go PreWarmTrackCache(requests)
 	return nil
@@ -187,13 +187,13 @@ type ItemProgressWriter struct {
 	writer       interface{ Write([]byte) (int, error) }
 	itemID       string
 	current      int64
-	lastReported int64     // Track last reported bytes for threshold-based updates
-	startTime    time.Time // Track start time for speed calculation
-	lastTime     time.Time // Track last update time for speed calculation
-	lastBytes    int64     // Track bytes at last speed calculation
+	lastReported int64
+	startTime    time.Time
+	lastTime     time.Time
+	lastBytes    int64
 }

-const progressUpdateThreshold = 64 * 1024 // Update progress every 64KB
+const progressUpdateThreshold = 64 * 1024

 func NewItemProgressWriter(w interface{ Write([]byte) (int, error) }, itemID string) *ItemProgressWriter {
 	now := time.Now()
@@ -380,10 +380,46 @@ func decodeXOR(data []byte) string {
 	return string(result)
 }

+func extractQobuzDownloadURLFromBody(body []byte) (string, error) {
+	var raw map[string]any
+	if err := json.Unmarshal(body, &raw); err != nil {
+		return "", fmt.Errorf("invalid JSON: %v", err)
+	}
+
+	if errMsg, ok := raw["error"].(string); ok && strings.TrimSpace(errMsg) != "" {
+		return "", fmt.Errorf("%s", errMsg)
+	}
+
+	if success, ok := raw["success"].(bool); ok && !success {
+		if msg, ok := raw["message"].(string); ok && strings.TrimSpace(msg) != "" {
+			return "", fmt.Errorf("%s", msg)
+		}
+		return "", fmt.Errorf("api returned success=false")
+	}
+
+	if urlVal, ok := raw["url"].(string); ok && strings.TrimSpace(urlVal) != "" {
+		return strings.TrimSpace(urlVal), nil
+	}
+	if linkVal, ok := raw["link"].(string); ok && strings.TrimSpace(linkVal) != "" {
+		return strings.TrimSpace(linkVal), nil
+	}
+
+	if data, ok := raw["data"].(map[string]any); ok {
+		if urlVal, ok := data["url"].(string); ok && strings.TrimSpace(urlVal) != "" {
+			return strings.TrimSpace(urlVal), nil
+		}
+		if linkVal, ok := data["link"].(string); ok && strings.TrimSpace(linkVal) != "" {
+			return strings.TrimSpace(linkVal), nil
+		}
+	}
+
+	return "", fmt.Errorf("no download URL in response")
+}
+
 func (q *QobuzDownloader) downloadFromJumo(trackID int64, quality string) (string, error) {
 	formatID := mapJumoQuality(quality)
 	region := "US"
-	jumoURL := fmt.Sprintf("https://jumo-dl.pages.dev/file?track_id=%d&format_id=%d&region=%s", trackID, formatID, region)
+	jumoURL := fmt.Sprintf("https://jumo-dl.pages.dev/get?track_id=%d&format_id=%d&region=%s", trackID, formatID, region)

 	GoLog("[Qobuz] Trying Jumo API fallback...\n")

@@ -392,6 +428,8 @@ func (q *QobuzDownloader) downloadFromJumo(trackID int64, quality string) (strin
 	if err != nil {
 		return "", err
 	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+	req.Header.Set("Referer", "https://jumo-dl.pages.dev/")

 	resp, err := client.Do(req)
 	if err != nil {
@@ -725,75 +763,151 @@ type qobuzAPIResult struct {
 	duration    time.Duration
 }

+// Qobuz API timeout configuration
+// Mobile networks are more unstable, so we use longer timeouts
+const (
+	qobuzAPITimeoutMobile = 25 * time.Second
+	qobuzMaxRetries       = 2 // Number of retries per API
+	qobuzRetryDelay       = 500 * time.Millisecond
+)
+
+// getQobuzAPITimeout returns appropriate timeout based on platform
+// For mobile (gomobile builds), we use longer timeouts
+func getQobuzAPITimeout() time.Duration {
+	// Since this runs in gomobile context, we always use mobile timeout
+	// The Go backend is only used on mobile (Android/iOS)
+	return qobuzAPITimeoutMobile
+}
+
+// qobuzSquidCountries defines the region fallback order for squid.wtf API
+var qobuzSquidCountries = []string{"US", "FR"}
+
+// fetchQobuzURLWithRetry fetches download URL from a single Qobuz API with retry logic
+// For squid.wtf APIs, it tries US region first, then falls back to FR
+func fetchQobuzURLWithRetry(api string, trackID int64, quality string, timeout time.Duration) (string, error) {
+	isSquid := strings.Contains(api, "squid.wtf")
+
+	if isSquid {
+		for _, country := range qobuzSquidCountries {
+			GoLog("[Qobuz] Trying squid.wtf with country=%s\n", country)
+			result, err := fetchQobuzURLSingleAttempt(api, trackID, quality, timeout, country)
+			if err == nil {
+				return result, nil
+			}
+			GoLog("[Qobuz] squid.wtf country=%s failed: %v\n", country, err)
+		}
+		return "", fmt.Errorf("squid.wtf failed for all regions (US, FR)")
+	}
+
+	return fetchQobuzURLSingleAttempt(api, trackID, quality, timeout, "")
+}
+
+// fetchQobuzURLSingleAttempt fetches download URL with retry logic for a single API+country combination
+func fetchQobuzURLSingleAttempt(api string, trackID int64, quality string, timeout time.Duration, country string) (string, error) {
+	var lastErr error
+	retryDelay := qobuzRetryDelay
+
+	for attempt := 0; attempt <= qobuzMaxRetries; attempt++ {
+		if attempt > 0 {
+			GoLog("[Qobuz] Retry %d/%d for %s after %v\n", attempt, qobuzMaxRetries, api, retryDelay)
+			time.Sleep(retryDelay)
+			retryDelay *= 2 // Exponential backoff
+		}
+
+		client := NewHTTPClientWithTimeout(timeout)
+		reqURL := fmt.Sprintf("%s%d&quality=%s", api, trackID, quality)
+		if country != "" {
+			reqURL += "&country=" + country
+		}
+
+		req, err := http.NewRequest("GET", reqURL, nil)
+		if err != nil {
+			lastErr = err
+			continue
+		}
+
+		resp, err := client.Do(req)
+		if err != nil {
+			lastErr = err
+			// Check for retryable errors (timeout, connection reset)
+			errStr := strings.ToLower(err.Error())
+			if strings.Contains(errStr, "timeout") ||
+				strings.Contains(errStr, "reset") ||
+				strings.Contains(errStr, "connection refused") ||
+				strings.Contains(errStr, "eof") {
+				continue // Retry
+			}
+			break // Non-retryable error
+		}
+		// Server errors are retryable
+		if resp.StatusCode >= 500 {
+			io.Copy(io.Discard, resp.Body)
+			resp.Body.Close()
+			lastErr = fmt.Errorf("HTTP %d", resp.StatusCode)
+			continue
+		}
+
+		// 429 rate limit - wait and retry
+		if resp.StatusCode == 429 {
+			io.Copy(io.Discard, resp.Body)
+			resp.Body.Close()
+			lastErr = fmt.Errorf("rate limited")
+			retryDelay = 2 * time.Second // Wait longer for rate limit
+			continue
+		}
+
+		if resp.StatusCode != 200 {
+			io.Copy(io.Discard, resp.Body)
+			resp.Body.Close()
+			return "", fmt.Errorf("HTTP %d", resp.StatusCode)
+		}
+
+		body, err := io.ReadAll(resp.Body)
+		resp.Body.Close()
+		if err != nil {
+			lastErr = err
+			continue
+		}
+
+		if len(body) > 0 && body[0] == '<' {
+			return "", fmt.Errorf("received HTML instead of JSON")
+		}
+
+		urlVal, parseErr := extractQobuzDownloadURLFromBody(body)
+		if parseErr == nil {
+			return urlVal, nil
+		}
+		lastErr = parseErr
+		continue
+	}
+
+	if lastErr != nil {
+		return "", lastErr
+	}
+	return "", fmt.Errorf("all retries failed")
+}
+
 func getQobuzDownloadURLParallel(apis []string, trackID int64, quality string) (string, string, error) {
 	if len(apis) == 0 {
 		return "", "", fmt.Errorf("no APIs available")
 	}

-	GoLog("[Qobuz] Requesting download URL from %d APIs in parallel...\n", len(apis))
+	GoLog("[Qobuz] Requesting download URL from %d APIs in parallel (with retry)...\n", len(apis))

 	resultChan := make(chan qobuzAPIResult, len(apis))
 	startTime := time.Now()
+	timeout := getQobuzAPITimeout()

 	for _, apiURL := range apis {
 		go func(api string) {
 			reqStart := time.Now()
-
-			client := NewHTTPClientWithTimeout(15 * time.Second)
-
-			reqURL := fmt.Sprintf("%s%d&quality=%s", api, trackID, quality)
-
-			req, err := http.NewRequest("GET", reqURL, nil)
-			if err != nil {
-				resultChan <- qobuzAPIResult{apiURL: api, err: err, duration: time.Since(reqStart)}
-				return
+			downloadURL, err := fetchQobuzURLWithRetry(api, trackID, quality, timeout)
+			resultChan <- qobuzAPIResult{
+				apiURL:      api,
+				downloadURL: downloadURL,
+				err:         err,
+				duration:    time.Since(reqStart),
 			}
-
-			resp, err := client.Do(req)
-			if err != nil {
-				resultChan <- qobuzAPIResult{apiURL: api, err: err, duration: time.Since(reqStart)}
-				return
-			}
-			defer resp.Body.Close()
-
-			if resp.StatusCode != 200 {
-				resultChan <- qobuzAPIResult{apiURL: api, err: fmt.Errorf("HTTP %d", resp.StatusCode), duration: time.Since(reqStart)}
-				return
-			}
-
-			body, err := io.ReadAll(resp.Body)
-			if err != nil {
-				resultChan <- qobuzAPIResult{apiURL: api, err: err, duration: time.Since(reqStart)}
-				return
-			}
-
-			if len(body) > 0 && body[0] == '<' {
-				resultChan <- qobuzAPIResult{apiURL: api, err: fmt.Errorf("received HTML instead of JSON"), duration: time.Since(reqStart)}
-				return
-			}
-
-			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
-			}
-
-			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)
 	}

@@ -860,7 +974,7 @@ func (q *QobuzDownloader) GetDownloadURL(trackID int64, quality string) (string,
 	return "", fmt.Errorf("all Qobuz APIs and Jumo fallback failed: %w", err)
 }

-func (q *QobuzDownloader) DownloadFile(downloadURL, outputPath, itemID string) error {
+func (q *QobuzDownloader) DownloadFile(downloadURL, outputPath string, outputFD int, itemID string) error {
 	ctx := context.Background()

 	if itemID != "" {
@@ -897,7 +1011,7 @@ func (q *QobuzDownloader) DownloadFile(downloadURL, outputPath, itemID string) e
 		SetItemBytesTotal(itemID, expectedSize)
 	}

-	out, err := os.Create(outputPath)
+	out, err := openOutputForWrite(outputPath, outputFD)
 	if err != nil {
 		return err
 	}
@@ -916,23 +1030,23 @@ func (q *QobuzDownloader) DownloadFile(downloadURL, outputPath, itemID string) e
 	closeErr := out.Close()

 	if err != nil {
-		os.Remove(outputPath)
+		cleanupOutputOnError(outputPath, outputFD)
 		if isDownloadCancelled(itemID) {
 			return ErrDownloadCancelled
 		}
 		return fmt.Errorf("download interrupted: %w", err)
 	}
 	if flushErr != nil {
-		os.Remove(outputPath)
+		cleanupOutputOnError(outputPath, outputFD)
 		return fmt.Errorf("failed to flush buffer: %w", flushErr)
 	}
 	if closeErr != nil {
-		os.Remove(outputPath)
+		cleanupOutputOnError(outputPath, outputFD)
 		return fmt.Errorf("failed to close file: %w", closeErr)
 	}

 	if expectedSize > 0 && written != expectedSize {
-		os.Remove(outputPath)
+		cleanupOutputOnError(outputPath, outputFD)
 		return fmt.Errorf("incomplete download: expected %d bytes, got %d bytes", expectedSize, written)
 	}

@@ -950,13 +1064,17 @@ type QobuzDownloadResult struct {
 	TrackNumber int
 	DiscNumber  int
 	ISRC        string
+	LyricsLRC   string
 }

 func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 	downloader := NewQobuzDownloader()

-	if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
-		return QobuzDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
+	isSafOutput := isFDOutput(req.OutputFD) || strings.TrimSpace(req.OutputPath) != ""
+	if !isSafOutput {
+		if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
+			return QobuzDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
+		}
 	}

 	expectedDurationSec := req.DurationMS / 1000
@@ -964,6 +1082,7 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 	var track *QobuzTrack
 	var err error

+	// Strategy 1: Use Qobuz ID from Odesli enrichment (fastest, most accurate)
 	if req.QobuzID != "" {
 		GoLog("[Qobuz] Using Qobuz ID from Odesli enrichment: %s\n", req.QobuzID)
 		var trackID int64
@@ -978,17 +1097,43 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		}
 	}

+	// Strategy 2: Use cached Qobuz Track ID (fast, no search needed)
 	if track == nil && req.ISRC != "" {
 		if cached := GetTrackIDCache().Get(req.ISRC); cached != nil && cached.QobuzTrackID > 0 {
 			GoLog("[Qobuz] Cache hit! Using cached track ID: %d\n", cached.QobuzTrackID)
-			track, err = downloader.SearchTrackByISRC(req.ISRC)
+			track, err = downloader.GetTrackByID(cached.QobuzTrackID)
 			if err != nil {
-				GoLog("[Qobuz] Cache hit but search failed: %v\n", err)
+				GoLog("[Qobuz] Cache hit but GetTrackByID failed: %v\n", err)
 				track = nil
 			}
 		}
 	}

+	// Strategy 3: Try to get QobuzID from SongLink if we have SpotifyID
+	if track == nil && req.SpotifyID != "" && req.QobuzID == "" {
+		GoLog("[Qobuz] Trying to get Qobuz ID from SongLink for Spotify ID: %s\n", req.SpotifyID)
+		songLinkClient := NewSongLinkClient()
+		availability, slErr := songLinkClient.CheckTrackAvailability(req.SpotifyID, req.ISRC)
+		if slErr == nil && availability != nil && availability.QobuzID != "" {
+			var trackID int64
+			if _, parseErr := fmt.Sscanf(availability.QobuzID, "%d", &trackID); parseErr == nil && trackID > 0 {
+				GoLog("[Qobuz] Got Qobuz ID %d from SongLink\n", trackID)
+				track, err = downloader.GetTrackByID(trackID)
+				if err != nil {
+					GoLog("[Qobuz] Failed to get track by SongLink ID %d: %v\n", trackID, err)
+					track = nil
+				} else if track != nil {
+					GoLog("[Qobuz] Successfully found track via SongLink ID: '%s' by '%s'\n", track.Title, track.Performer.Name)
+					// Cache for future use
+					if req.ISRC != "" {
+						GetTrackIDCache().SetQobuz(req.ISRC, track.ID)
+					}
+				}
+			}
+		}
+	}
+
+	// Strategy 4: ISRC search with duration verification
 	if track == nil && req.ISRC != "" {
 		GoLog("[Qobuz] Trying ISRC search: %s\n", req.ISRC)
 		track, err = downloader.SearchTrackByISRCWithDuration(req.ISRC, expectedDurationSec)
@@ -1005,7 +1150,9 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		}
 	}

+	// Strategy 5: Metadata search with strict matching (duration tolerance: 10 seconds)
 	if track == nil {
+		GoLog("[Qobuz] Trying metadata search: '%s' by '%s'\n", req.TrackName, req.ArtistName)
 		track, err = downloader.SearchTrackByMetadataWithDuration(req.TrackName, req.ArtistName, expectedDurationSec)
 		if track != nil && !qobuzArtistsMatch(req.ArtistName, track.Performer.Name) {
 			GoLog("[Qobuz] Artist mismatch from metadata search: expected '%s', got '%s'. Rejecting.\n",
@@ -1033,13 +1180,21 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		"album":  req.AlbumName,
 		"track":  req.TrackNumber,
 		"year":   extractYear(req.ReleaseDate),
+		"date":   req.ReleaseDate,
 		"disc":   req.DiscNumber,
 	})
-	filename = sanitizeFilename(filename) + ".flac"
-	outputPath := filepath.Join(req.OutputDir, filename)
-
-	if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
-		return QobuzDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
+	var outputPath string
+	if isSafOutput {
+		outputPath = strings.TrimSpace(req.OutputPath)
+		if outputPath == "" && isFDOutput(req.OutputFD) {
+			outputPath = fmt.Sprintf("/proc/self/fd/%d", req.OutputFD)
+		}
+	} else {
+		filename = sanitizeFilename(filename) + ".flac"
+		outputPath = filepath.Join(req.OutputDir, filename)
+		if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
+			return QobuzDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
+		}
 	}

 	qobuzQuality := "27"
@@ -1077,7 +1232,7 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		)
 	}()

-	if err := downloader.DownloadFile(downloadURL, outputPath, req.ItemID); err != nil {
+	if err := downloader.DownloadFile(downloadURL, outputPath, req.OutputFD, req.ItemID); err != nil {
 		if errors.Is(err, ErrDownloadCancelled) {
 			return QobuzDownloadResult{}, ErrDownloadCancelled
 		}
@@ -1122,39 +1277,50 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		GoLog("[Qobuz] Using parallel-fetched cover (%d bytes)\n", len(coverData))
 	}

-	if err := EmbedMetadataWithCoverData(outputPath, metadata, coverData); err != nil {
-		fmt.Printf("Warning: failed to embed metadata: %v\n", err)
+	if isSafOutput {
+		GoLog("[Qobuz] SAF output detected - skipping in-backend metadata/lyrics embedding (handled in Flutter)\n")
+	} else {
+		if err := EmbedMetadataWithCoverData(outputPath, metadata, coverData); err != nil {
+			fmt.Printf("Warning: failed to embed metadata: %v\n", err)
+		}
+
+		if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
+			lyricsMode := req.LyricsMode
+			if lyricsMode == "" {
+				lyricsMode = "embed"
+			}
+
+			if lyricsMode == "external" || lyricsMode == "both" {
+				GoLog("[Qobuz] Saving external LRC file...\n")
+				if lrcPath, lrcErr := SaveLRCFile(outputPath, parallelResult.LyricsLRC); lrcErr != nil {
+					GoLog("[Qobuz] Warning: failed to save LRC file: %v\n", lrcErr)
+				} else {
+					GoLog("[Qobuz] LRC file saved: %s\n", lrcPath)
+				}
+			}
+
+			if lyricsMode == "embed" || lyricsMode == "both" {
+				GoLog("[Qobuz] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
+				if embedErr := EmbedLyrics(outputPath, parallelResult.LyricsLRC); embedErr != nil {
+					GoLog("[Qobuz] Warning: failed to embed lyrics: %v\n", embedErr)
+				} else {
+					fmt.Println("[Qobuz] Lyrics embedded successfully")
+				}
+			}
+		} else if req.EmbedLyrics {
+			fmt.Println("[Qobuz] No lyrics available from parallel fetch")
+		}
 	}

+	if !isSafOutput {
+		AddToISRCIndex(req.OutputDir, req.ISRC, outputPath)
+	}
+
+	lyricsLRC := ""
 	if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
-		lyricsMode := req.LyricsMode
-		if lyricsMode == "" {
-			lyricsMode = "embed"
-		}
-
-		if lyricsMode == "external" || lyricsMode == "both" {
-			GoLog("[Qobuz] Saving external LRC file...\n")
-			if lrcPath, lrcErr := SaveLRCFile(outputPath, parallelResult.LyricsLRC); lrcErr != nil {
-				GoLog("[Qobuz] Warning: failed to save LRC file: %v\n", lrcErr)
-			} else {
-				GoLog("[Qobuz] LRC file saved: %s\n", lrcPath)
-			}
-		}
-
-		if lyricsMode == "embed" || lyricsMode == "both" {
-			GoLog("[Qobuz] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
-			if embedErr := EmbedLyrics(outputPath, parallelResult.LyricsLRC); embedErr != nil {
-				GoLog("[Qobuz] Warning: failed to embed lyrics: %v\n", embedErr)
-			} else {
-				fmt.Println("[Qobuz] Lyrics embedded successfully")
-			}
-		}
-	} else if req.EmbedLyrics {
-		fmt.Println("[Qobuz] No lyrics available from parallel fetch")
+		lyricsLRC = parallelResult.LyricsLRC
 	}

-	AddToISRCIndex(req.OutputDir, req.ISRC, outputPath)
-
 	return QobuzDownloadResult{
 		FilePath:    outputPath,
 		BitDepth:    actualBitDepth,
@@ -1166,5 +1332,6 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		TrackNumber: actualTrackNumber,
 		DiscNumber:  req.DiscNumber,
 		ISRC:        track.ISRC,
+		LyricsLRC:   lyricsLRC,
 	}, nil
 }
@@ -0,0 +1,47 @@
+package gobackend
+
+import "testing"
+
+func TestExtractQobuzDownloadURLFromBody(t *testing.T) {
+	t.Run("reads nested data.url", func(t *testing.T) {
+		body := []byte(`{"success":true,"data":{"url":"https://example.test/audio.flac"}}`)
+
+		got, err := extractQobuzDownloadURLFromBody(body)
+		if err != nil {
+			t.Fatalf("expected no error, got %v", err)
+		}
+		if got != "https://example.test/audio.flac" {
+			t.Fatalf("unexpected URL: %q", got)
+		}
+	})
+
+	t.Run("reads top-level url", func(t *testing.T) {
+		body := []byte(`{"url":"https://example.test/top.flac"}`)
+
+		got, err := extractQobuzDownloadURLFromBody(body)
+		if err != nil {
+			t.Fatalf("expected no error, got %v", err)
+		}
+		if got != "https://example.test/top.flac" {
+			t.Fatalf("unexpected URL: %q", got)
+		}
+	})
+
+	t.Run("returns API error", func(t *testing.T) {
+		body := []byte(`{"error":"track not found"}`)
+
+		_, err := extractQobuzDownloadURLFromBody(body)
+		if err == nil || err.Error() != "track not found" {
+			t.Fatalf("expected track-not-found error, got %v", err)
+		}
+	})
+
+	t.Run("returns message when success false", func(t *testing.T) {
+		body := []byte(`{"success":false,"message":"blocked"}`)
+
+		_, err := extractQobuzDownloadURLFromBody(body)
+		if err == nil || err.Error() != "blocked" {
+			t.Fatalf("expected blocked error, got %v", err)
+		}
+	})
+}
@@ -0,0 +1,80 @@
+package gobackend
+
+import (
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestSanitizeSensitiveLogText(t *testing.T) {
+	input := "access_token=abc123 Authorization:Bearer xyz456 https://api.example.com/cb?refresh_token=zzz"
+	redacted := sanitizeSensitiveLogText(input)
+
+	if strings.Contains(redacted, "abc123") || strings.Contains(redacted, "xyz456") || strings.Contains(redacted, "zzz") {
+		t.Fatalf("expected sensitive values to be redacted, got: %s", redacted)
+	}
+	if !strings.Contains(redacted, "[REDACTED]") {
+		t.Fatalf("expected redaction marker in output, got: %s", redacted)
+	}
+}
+
+func TestValidateExtensionAuthURL(t *testing.T) {
+	if err := validateExtensionAuthURL("https://accounts.example.com/oauth/authorize"); err != nil {
+		t.Fatalf("expected valid auth URL, got error: %v", err)
+	}
+
+	blocked := []string{
+		"http://accounts.example.com/oauth/authorize",
+		"https://user:pass@accounts.example.com/oauth/authorize",
+		"https://localhost/oauth/authorize",
+	}
+
+	for _, rawURL := range blocked {
+		if err := validateExtensionAuthURL(rawURL); err == nil {
+			t.Fatalf("expected URL to be blocked: %s", rawURL)
+		}
+	}
+}
+
+func TestValidateDomainRejectsEmbeddedCredentials(t *testing.T) {
+	ext := &LoadedExtension{
+		ID: "test-ext",
+		Manifest: &ExtensionManifest{
+			Name: "test-ext",
+			Permissions: ExtensionPermissions{
+				Network: []string{"api.example.com"},
+			},
+		},
+		DataDir: t.TempDir(),
+	}
+
+	runtime := NewExtensionRuntime(ext)
+	if err := runtime.validateDomain("https://user:pass@api.example.com/resource"); err == nil {
+		t.Fatal("expected embedded URL credentials to be rejected")
+	}
+}
+
+func TestBuildStoreExtensionDestPath(t *testing.T) {
+	baseDir := t.TempDir()
+
+	destPath, err := buildStoreExtensionDestPath(baseDir, "../evil/name")
+	if err != nil {
+		t.Fatalf("expected sanitized path to be generated, got error: %v", err)
+	}
+
+	if !isPathWithinBase(baseDir, destPath) {
+		t.Fatalf("expected destination path to remain under base dir: %s", destPath)
+	}
+
+	baseName := filepath.Base(destPath)
+	if strings.Contains(baseName, "/") || strings.Contains(baseName, `\`) {
+		t.Fatalf("expected filename to be sanitized, got: %s", baseName)
+	}
+	if !strings.HasSuffix(baseName, ".spotiflac-ext") {
+		t.Fatalf("expected .spotiflac-ext suffix, got: %s", baseName)
+	}
+
+	if _, err := buildStoreExtensionDestPath(baseDir, "   "); err == nil {
+		t.Fatal("expected empty extension id to be rejected")
+	}
+}
@@ -8,7 +8,6 @@ import (
 	"net/url"
 	"strings"
 	"sync"
-	"time"
 )

 type SongLinkClient struct {
@@ -16,16 +15,21 @@ type SongLinkClient struct {
 }

 type TrackAvailability struct {
-	SpotifyID string `json:"spotify_id"`
-	Tidal     bool   `json:"tidal"`
-	Amazon    bool   `json:"amazon"`
-	Qobuz     bool   `json:"qobuz"`
-	Deezer    bool   `json:"deezer"`
-	TidalURL  string `json:"tidal_url,omitempty"`
-	AmazonURL string `json:"amazon_url,omitempty"`
-	QobuzURL  string `json:"qobuz_url,omitempty"`
-	DeezerURL string `json:"deezer_url,omitempty"`
-	DeezerID  string `json:"deezer_id,omitempty"`
+	SpotifyID  string `json:"spotify_id"`
+	Tidal      bool   `json:"tidal"`
+	Amazon     bool   `json:"amazon"`
+	Qobuz      bool   `json:"qobuz"`
+	Deezer     bool   `json:"deezer"`
+	YouTube    bool   `json:"youtube"`
+	TidalURL   string `json:"tidal_url,omitempty"`
+	AmazonURL  string `json:"amazon_url,omitempty"`
+	QobuzURL   string `json:"qobuz_url,omitempty"`
+	DeezerURL  string `json:"deezer_url,omitempty"`
+	YouTubeURL string `json:"youtube_url,omitempty"`
+	DeezerID   string `json:"deezer_id,omitempty"`
+	QobuzID    string `json:"qobuz_id,omitempty"`
+	TidalID    string `json:"tidal_id,omitempty"`
+	YouTubeID  string `json:"youtube_id,omitempty"`
 }

 var (
@@ -36,7 +40,7 @@ var (
 func NewSongLinkClient() *SongLinkClient {
 	songLinkClientOnce.Do(func() {
 		globalSongLinkClient = &SongLinkClient{
-			client: NewHTTPClientWithTimeout(SongLinkTimeout),
+			client: NewMetadataHTTPClient(SongLinkTimeout),
 		}
 	})
 	return globalSongLinkClient
@@ -98,6 +102,7 @@ func (s *SongLinkClient) CheckTrackAvailability(spotifyTrackID string, isrc stri
 	if tidalLink, ok := songLinkResp.LinksByPlatform["tidal"]; ok && tidalLink.URL != "" {
 		availability.Tidal = true
 		availability.TidalURL = tidalLink.URL
+		availability.TidalID = extractTidalIDFromURL(tidalLink.URL)
 	}

 	if amazonLink, ok := songLinkResp.LinksByPlatform["amazonMusic"]; ok && amazonLink.URL != "" {
@@ -111,6 +116,28 @@ func (s *SongLinkClient) CheckTrackAvailability(spotifyTrackID string, isrc stri
 		availability.DeezerID = extractDeezerIDFromURL(deezerLink.URL)
 	}

+	if qobuzLink, ok := songLinkResp.LinksByPlatform["qobuz"]; ok && qobuzLink.URL != "" {
+		availability.Qobuz = true
+		availability.QobuzURL = qobuzLink.URL
+		availability.QobuzID = extractQobuzIDFromURL(qobuzLink.URL)
+	}
+
+	// Prefer youtubeMusic URLs — they bypass Cobalt login requirements
+	if ytMusicLink, ok := songLinkResp.LinksByPlatform["youtubeMusic"]; ok && ytMusicLink.URL != "" {
+		availability.YouTube = true
+		availability.YouTubeURL = ytMusicLink.URL
+		availability.YouTubeID = extractYouTubeIDFromURL(ytMusicLink.URL)
+	}
+
+	// Fallback to regular youtube if youtubeMusic not available
+	if !availability.YouTube {
+		if youtubeLink, ok := songLinkResp.LinksByPlatform["youtube"]; ok && youtubeLink.URL != "" {
+			availability.YouTube = true
+			availability.YouTubeURL = youtubeLink.URL
+			availability.YouTubeID = extractYouTubeIDFromURL(youtubeLink.URL)
+		}
+	}
+
 	return availability, nil
 }

@@ -131,40 +158,6 @@ func (s *SongLinkClient) GetStreamingURLs(spotifyTrackID string) (map[string]str
 	return urls, nil
 }

-func checkQobuzAvailability(isrc string) bool {
-	client := NewHTTPClientWithTimeout(10 * time.Second)
-	appID := "798273057"
-
-	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly93d3cucW9idXouY29tL2FwaS5qc29uLzAuMi90cmFjay9zZWFyY2g/cXVlcnk9")
-	searchURL := fmt.Sprintf("%s%s&limit=1&app_id=%s", string(apiBase), isrc, appID)
-
-	req, err := http.NewRequest("GET", searchURL, nil)
-	if err != nil {
-		return false
-	}
-
-	resp, err := DoRequestWithUserAgent(client, req)
-	if err != nil {
-		return false
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != 200 {
-		return false
-	}
-
-	var searchResp struct {
-		Tracks struct {
-			Total int `json:"total"`
-		} `json:"tracks"`
-	}
-	if err := json.NewDecoder(resp.Body).Decode(&searchResp); err != nil {
-		return false
-	}
-
-	return searchResp.Tracks.Total > 0
-}
-
 // extractDeezerIDFromURL extracts Deezer track/album/artist ID from URL
 func extractDeezerIDFromURL(deezerURL string) string {
 	parts := strings.Split(deezerURL, "/")
@@ -178,6 +171,148 @@ func extractDeezerIDFromURL(deezerURL string) string {
 	return ""
 }

+// extractQobuzIDFromURL extracts Qobuz track ID from URL
+// URL formats:
+//   - https://www.qobuz.com/us-en/album/.../12345678 (album page with track highlight)
+//   - https://open.qobuz.com/track/12345678
+//   - https://www.qobuz.com/track/12345678
+//   - https://play.qobuz.com/track/12345678
+func extractQobuzIDFromURL(qobuzURL string) string {
+	if qobuzURL == "" {
+		return ""
+	}
+
+	// Try to find /track/ID pattern first
+	if strings.Contains(qobuzURL, "/track/") {
+		parts := strings.Split(qobuzURL, "/track/")
+		if len(parts) > 1 {
+			idPart := parts[1]
+			// Remove query parameters
+			if idx := strings.Index(idPart, "?"); idx > 0 {
+				idPart = idPart[:idx]
+			}
+			// Remove trailing slash or path
+			if idx := strings.Index(idPart, "/"); idx > 0 {
+				idPart = idPart[:idx]
+			}
+			idPart = strings.TrimSpace(idPart)
+			// Validate it's a number
+			if idPart != "" && isNumeric(idPart) {
+				return idPart
+			}
+		}
+	}
+
+	// Try to extract from album URL with track highlight
+	// Format: /album/albumname/trackid or ?trackId=12345678
+	if strings.Contains(qobuzURL, "trackId=") {
+		parts := strings.Split(qobuzURL, "trackId=")
+		if len(parts) > 1 {
+			idPart := parts[1]
+			if idx := strings.Index(idPart, "&"); idx > 0 {
+				idPart = idPart[:idx]
+			}
+			idPart = strings.TrimSpace(idPart)
+			if idPart != "" && isNumeric(idPart) {
+				return idPart
+			}
+		}
+	}
+
+	// Last resort: get last numeric segment from URL
+	parts := strings.Split(qobuzURL, "/")
+	for i := len(parts) - 1; i >= 0; i-- {
+		part := parts[i]
+		// Remove query parameters
+		if idx := strings.Index(part, "?"); idx > 0 {
+			part = part[:idx]
+		}
+		part = strings.TrimSpace(part)
+		if part != "" && isNumeric(part) {
+			return part
+		}
+	}
+
+	return ""
+}
+
+// extractTidalIDFromURL extracts Tidal track ID from URL
+// URL formats:
+//   - https://tidal.com/browse/track/12345678
+//   - https://listen.tidal.com/track/12345678
+func extractTidalIDFromURL(tidalURL string) string {
+	if tidalURL == "" {
+		return ""
+	}
+
+	if strings.Contains(tidalURL, "/track/") {
+		parts := strings.Split(tidalURL, "/track/")
+		if len(parts) > 1 {
+			idPart := parts[1]
+			if idx := strings.Index(idPart, "?"); idx > 0 {
+				idPart = idPart[:idx]
+			}
+			if idx := strings.Index(idPart, "/"); idx > 0 {
+				idPart = idPart[:idx]
+			}
+			idPart = strings.TrimSpace(idPart)
+			if idPart != "" && isNumeric(idPart) {
+				return idPart
+			}
+		}
+	}
+
+	return ""
+}
+
+// extractYouTubeIDFromURL extracts YouTube video ID from URL
+// URL formats:
+//   - https://www.youtube.com/watch?v=VIDEO_ID
+//   - https://youtu.be/VIDEO_ID
+//   - https://music.youtube.com/watch?v=VIDEO_ID
+func extractYouTubeIDFromURL(youtubeURL string) string {
+	if youtubeURL == "" {
+		return ""
+	}
+
+	// Handle youtu.be short URLs
+	if strings.Contains(youtubeURL, "youtu.be/") {
+		parts := strings.Split(youtubeURL, "youtu.be/")
+		if len(parts) >= 2 {
+			idPart := parts[1]
+			if idx := strings.Index(idPart, "?"); idx > 0 {
+				idPart = idPart[:idx]
+			}
+			if idx := strings.Index(idPart, "&"); idx > 0 {
+				idPart = idPart[:idx]
+			}
+			return strings.TrimSpace(idPart)
+		}
+	}
+
+	// Handle youtube.com URLs with ?v= parameter
+	parsed, err := url.Parse(youtubeURL)
+	if err != nil {
+		return ""
+	}
+
+	if v := parsed.Query().Get("v"); v != "" {
+		return v
+	}
+
+	// Handle /embed/ format
+	if strings.Contains(parsed.Path, "/embed/") {
+		parts := strings.Split(parsed.Path, "/embed/")
+		if len(parts) >= 2 {
+			return strings.Split(parts[1], "/")[0]
+		}
+	}
+
+	return ""
+}
+
+// isNumeric is defined in library_scan.go
+
 func (s *SongLinkClient) GetDeezerIDFromSpotify(spotifyTrackID string) (string, error) {
 	availability, err := s.CheckTrackAvailability(spotifyTrackID, "")
 	if err != nil {
@@ -191,6 +326,20 @@ func (s *SongLinkClient) GetDeezerIDFromSpotify(spotifyTrackID string) (string,
 	return availability.DeezerID, nil
 }

+// GetYouTubeURLFromSpotify converts a Spotify track ID to YouTube URL using SongLink
+func (s *SongLinkClient) GetYouTubeURLFromSpotify(spotifyTrackID string) (string, error) {
+	availability, err := s.CheckTrackAvailability(spotifyTrackID, "")
+	if err != nil {
+		return "", err
+	}
+
+	if !availability.YouTube || availability.YouTubeURL == "" {
+		return "", fmt.Errorf("track not found on YouTube")
+	}
+
+	return availability.YouTubeURL, nil
+}
+
 // AlbumAvailability represents album availability on different platforms
 type AlbumAvailability struct {
 	SpotifyID string `json:"spotify_id"`
@@ -353,6 +502,7 @@ func (s *SongLinkClient) checkAvailabilityFromDeezerSongLink(deezerTrackID strin
 	if tidalLink, ok := songLinkResp.LinksByPlatform["tidal"]; ok && tidalLink.URL != "" {
 		availability.Tidal = true
 		availability.TidalURL = tidalLink.URL
+		availability.TidalID = extractTidalIDFromURL(tidalLink.URL)
 	}

 	if amazonLink, ok := songLinkResp.LinksByPlatform["amazonMusic"]; ok && amazonLink.URL != "" {
@@ -360,10 +510,29 @@ func (s *SongLinkClient) checkAvailabilityFromDeezerSongLink(deezerTrackID strin
 		availability.AmazonURL = amazonLink.URL
 	}

+	if qobuzLink, ok := songLinkResp.LinksByPlatform["qobuz"]; ok && qobuzLink.URL != "" {
+		availability.Qobuz = true
+		availability.QobuzURL = qobuzLink.URL
+		availability.QobuzID = extractQobuzIDFromURL(qobuzLink.URL)
+	}
+
 	if deezerLink, ok := songLinkResp.LinksByPlatform["deezer"]; ok && deezerLink.URL != "" {
 		availability.DeezerURL = deezerLink.URL
 	}

+	if youtubeLink, ok := songLinkResp.LinksByPlatform["youtube"]; ok && youtubeLink.URL != "" {
+		availability.YouTube = true
+		availability.YouTubeURL = youtubeLink.URL
+		availability.YouTubeID = extractYouTubeIDFromURL(youtubeLink.URL)
+	}
+	if !availability.YouTube {
+		if ytMusicLink, ok := songLinkResp.LinksByPlatform["youtubeMusic"]; ok && ytMusicLink.URL != "" {
+			availability.YouTube = true
+			availability.YouTubeURL = ytMusicLink.URL
+			availability.YouTubeID = extractYouTubeIDFromURL(ytMusicLink.URL)
+		}
+	}
+
 	return availability, nil
 }

@@ -431,6 +600,7 @@ func (s *SongLinkClient) CheckAvailabilityByPlatform(platform, entityType, entit
 	if tidalLink, ok := songLinkResp.LinksByPlatform["tidal"]; ok && tidalLink.URL != "" {
 		availability.Tidal = true
 		availability.TidalURL = tidalLink.URL
+		availability.TidalID = extractTidalIDFromURL(tidalLink.URL)
 	}

 	if amazonLink, ok := songLinkResp.LinksByPlatform["amazonMusic"]; ok && amazonLink.URL != "" {
@@ -438,12 +608,31 @@ func (s *SongLinkClient) CheckAvailabilityByPlatform(platform, entityType, entit
 		availability.AmazonURL = amazonLink.URL
 	}

+	if qobuzLink, ok := songLinkResp.LinksByPlatform["qobuz"]; ok && qobuzLink.URL != "" {
+		availability.Qobuz = true
+		availability.QobuzURL = qobuzLink.URL
+		availability.QobuzID = extractQobuzIDFromURL(qobuzLink.URL)
+	}
+
 	if deezerLink, ok := songLinkResp.LinksByPlatform["deezer"]; ok && deezerLink.URL != "" {
 		availability.Deezer = true
 		availability.DeezerURL = deezerLink.URL
 		availability.DeezerID = extractDeezerIDFromURL(deezerLink.URL)
 	}

+	if youtubeLink, ok := songLinkResp.LinksByPlatform["youtube"]; ok && youtubeLink.URL != "" {
+		availability.YouTube = true
+		availability.YouTubeURL = youtubeLink.URL
+		availability.YouTubeID = extractYouTubeIDFromURL(youtubeLink.URL)
+	}
+	if !availability.YouTube {
+		if ytMusicLink, ok := songLinkResp.LinksByPlatform["youtubeMusic"]; ok && ytMusicLink.URL != "" {
+			availability.YouTube = true
+			availability.YouTubeURL = ytMusicLink.URL
+			availability.YouTubeID = extractYouTubeIDFromURL(ytMusicLink.URL)
+		}
+	}
+
 	return availability, nil
 }

@@ -499,3 +688,101 @@ func (s *SongLinkClient) GetAmazonURLFromDeezer(deezerTrackID string) (string, e

 	return availability.AmazonURL, nil
 }
+
+// GetYouTubeURLFromDeezer converts a Deezer track ID to YouTube URL using SongLink
+func (s *SongLinkClient) GetYouTubeURLFromDeezer(deezerTrackID string) (string, error) {
+	availability, err := s.CheckAvailabilityFromDeezer(deezerTrackID)
+	if err != nil {
+		return "", err
+	}
+
+	if !availability.YouTube || availability.YouTubeURL == "" {
+		return "", fmt.Errorf("track not found on YouTube")
+	}
+
+	return availability.YouTubeURL, nil
+}
+
+func (s *SongLinkClient) CheckAvailabilityFromURL(inputURL string) (*TrackAvailability, error) {
+	songLinkRateLimiter.WaitForSlot()
+
+	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9hcGkuc29uZy5saW5rL3YxLWFscGhhLjEvbGlua3M/dXJsPQ==")
+	apiURL := fmt.Sprintf("%s%s", string(apiBase), url.QueryEscape(inputURL))
+
+	req, err := http.NewRequest("GET", apiURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	retryConfig := DefaultRetryConfig()
+	resp, err := DoRequestWithRetry(s.client, req, retryConfig)
+	if err != nil {
+		return nil, fmt.Errorf("failed to check availability: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == 400 || resp.StatusCode == 404 {
+		return nil, fmt.Errorf("track not found on SongLink")
+	}
+	if resp.StatusCode == 429 {
+		return nil, fmt.Errorf("SongLink rate limit exceeded")
+	}
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("SongLink API returned status %d", resp.StatusCode)
+	}
+
+	body, err := ReadResponseBody(resp)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	var songLinkResp struct {
+		LinksByPlatform map[string]struct {
+			URL      string `json:"url"`
+			EntityID string `json:"entityUniqueId"`
+		} `json:"linksByPlatform"`
+	}
+
+	if err := json.Unmarshal(body, &songLinkResp); err != nil {
+		return nil, fmt.Errorf("failed to decode response: %w", err)
+	}
+
+	availability := &TrackAvailability{}
+
+	if spotifyLink, ok := songLinkResp.LinksByPlatform["spotify"]; ok && spotifyLink.URL != "" {
+		availability.SpotifyID = extractSpotifyIDFromURL(spotifyLink.URL)
+	}
+	if tidalLink, ok := songLinkResp.LinksByPlatform["tidal"]; ok && tidalLink.URL != "" {
+		availability.Tidal = true
+		availability.TidalURL = tidalLink.URL
+		availability.TidalID = extractTidalIDFromURL(tidalLink.URL)
+	}
+	if amazonLink, ok := songLinkResp.LinksByPlatform["amazonMusic"]; ok && amazonLink.URL != "" {
+		availability.Amazon = true
+		availability.AmazonURL = amazonLink.URL
+	}
+	if qobuzLink, ok := songLinkResp.LinksByPlatform["qobuz"]; ok && qobuzLink.URL != "" {
+		availability.Qobuz = true
+		availability.QobuzURL = qobuzLink.URL
+		availability.QobuzID = extractQobuzIDFromURL(qobuzLink.URL)
+	}
+	if deezerLink, ok := songLinkResp.LinksByPlatform["deezer"]; ok && deezerLink.URL != "" {
+		availability.Deezer = true
+		availability.DeezerURL = deezerLink.URL
+		availability.DeezerID = extractDeezerIDFromURL(deezerLink.URL)
+	}
+	if youtubeLink, ok := songLinkResp.LinksByPlatform["youtube"]; ok && youtubeLink.URL != "" {
+		availability.YouTube = true
+		availability.YouTubeURL = youtubeLink.URL
+		availability.YouTubeID = extractYouTubeIDFromURL(youtubeLink.URL)
+	}
+	if !availability.YouTube {
+		if ytMusicLink, ok := songLinkResp.LinksByPlatform["youtubeMusic"]; ok && ytMusicLink.URL != "" {
+			availability.YouTube = true
+			availability.YouTubeURL = ytMusicLink.URL
+			availability.YouTubeID = extractYouTubeIDFromURL(ytMusicLink.URL)
+		}
+	}
+
+	return availability, nil
+}
@@ -0,0 +1,80 @@
+package gobackend
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+	"time"
+)
+
+const DefaultSpotFetchAPIBaseURL = "https://spotify.afkarxyz.fun/api"
+
+// GetSpotifyDataWithAPI fetches Spotify metadata through SpotFetch-compatible API.
+// This is used as a fallback when direct Spotify API access is blocked/limited.
+func GetSpotifyDataWithAPI(ctx context.Context, spotifyURL, apiBaseURL string) (interface{}, error) {
+	parsed, err := parseSpotifyURI(spotifyURL)
+	if err != nil {
+		return nil, fmt.Errorf("invalid Spotify URL: %w", err)
+	}
+
+	base := strings.TrimSpace(apiBaseURL)
+	if base == "" {
+		base = DefaultSpotFetchAPIBaseURL
+	}
+
+	endpoint := fmt.Sprintf("%s/%s/%s", strings.TrimSuffix(base, "/"), parsed.Type, parsed.ID)
+	req, err := http.NewRequestWithContext(ctx, "GET", endpoint, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create SpotFetch API request: %w", err)
+	}
+	req.Header.Set("User-Agent", getRandomUserAgent())
+	req.Header.Set("Accept", "application/json")
+
+	client := NewHTTPClientWithTimeout(30 * time.Second)
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("SpotFetch API request failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("SpotFetch API error: HTTP %d", resp.StatusCode)
+	}
+
+	bodyBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read SpotFetch API response: %w", err)
+	}
+
+	switch parsed.Type {
+	case "track":
+		var trackResp TrackResponse
+		if err := json.Unmarshal(bodyBytes, &trackResp); err != nil {
+			return nil, fmt.Errorf("failed to decode track response: %w", err)
+		}
+		return trackResp, nil
+	case "album":
+		var albumResp AlbumResponsePayload
+		if err := json.Unmarshal(bodyBytes, &albumResp); err != nil {
+			return nil, fmt.Errorf("failed to decode album response: %w", err)
+		}
+		return &albumResp, nil
+	case "playlist":
+		var playlistResp PlaylistResponsePayload
+		if err := json.Unmarshal(bodyBytes, &playlistResp); err != nil {
+			return nil, fmt.Errorf("failed to decode playlist response: %w", err)
+		}
+		return playlistResp, nil
+	case "artist":
+		var artistResp ArtistResponsePayload
+		if err := json.Unmarshal(bodyBytes, &artistResp); err != nil {
+			return nil, fmt.Errorf("failed to decode artist response: %w", err)
+		}
+		return &artistResp, nil
+	default:
+		return nil, fmt.Errorf("unsupported Spotify type: %s", parsed.Type)
+	}
+}
@@ -63,7 +63,6 @@ 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)")

 func SetSpotifyCredentials(clientID, clientSecret string) {
@@ -115,7 +114,7 @@ func NewSpotifyMetadataClient() (*SpotifyMetadataClient, error) {
 	src := rand.NewSource(time.Now().UnixNano())

 	c := &SpotifyMetadataClient{
-		httpClient:   NewHTTPClientWithTimeout(15 * time.Second),
+		httpClient:   NewMetadataHTTPClient(15 * time.Second),
 		clientID:     clientID,
 		clientSecret: clientSecret,
 		rng:          rand.New(src),
@@ -141,7 +140,7 @@ 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
+	AlbumType   string `json:"album_type,omitempty"`
 }

 type AlbumTrackMetadata struct {
@@ -210,7 +209,7 @@ type ArtistAlbumMetadata struct {
 	ReleaseDate string `json:"release_date"`
 	TotalTracks int    `json:"total_tracks"`
 	Images      string `json:"images"`
-	AlbumType   string `json:"album_type"` // album, single, compilation
+	AlbumType   string `json:"album_type"`
 	Artists     string `json:"artists"`
 }

@@ -532,7 +531,6 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s

 	albumImage := firstImageURL(data.Images)

-	// Get first artist ID
 	var firstArtistId string
 	if len(data.Artists) > 0 {
 		firstArtistId = data.Artists[0].ID
@@ -565,7 +563,6 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s

 	fmt.Printf("[Spotify] Album has %d tracks (total: %d)\n", len(allTrackItems), data.TotalTracks)

-	// Collect track IDs for parallel ISRC fetching
 	trackIDs := make([]string, len(allTrackItems))
 	for i, item := range allTrackItems {
 		trackIDs[i] = item.ID
@@ -937,14 +934,14 @@ func (c *SpotifyMetadataClient) randomUserAgent() string {
 	defer c.rngMu.Unlock()

 	macMajor := c.rng.Intn(4) + 11
-	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
+	macMinor := c.rng.Intn(5) + 4
+	webkitMajor := c.rng.Intn(7) + 530
+	webkitMinor := c.rng.Intn(7) + 30
+	chromeMajor := c.rng.Intn(25) + 80
+	chromeBuild := c.rng.Intn(1500) + 3000
+	chromePatch := c.rng.Intn(65) + 60
+	safariMajor := c.rng.Intn(7) + 530
+	safariMinor := c.rng.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",
@@ -317,7 +317,6 @@ func (t *TidalDownloader) SearchTrackByISRC(isrc string) (*TidalTrack, error) {
 		return nil, err
 	}

-	// Find exact ISRC match
 	for i := range result.Items {
 		if result.Items[i].ISRC == isrc {
 			return &result.Items[i], nil
@@ -341,7 +340,6 @@ func (t *TidalDownloader) SearchTrackByMetadataWithISRC(trackName, artistName, s
 	// Build search queries - multiple strategies (same as PC version)
 	queries := []string{}

-	// Strategy 1: Artist + Track name (original)
 	if artistName != "" && trackName != "" {
 		queries = append(queries, artistName+" "+trackName)
 	}
@@ -584,13 +582,123 @@ type tidalAPIResult struct {
 	duration time.Duration
 }

-// Returns the first successful result (supports both v1 and v2 API formats)
+// Tidal API timeout configuration
+// Mobile networks are more unstable, so we use longer timeouts
+const (
+	tidalAPITimeoutMobile = 25 * time.Second
+	tidalMaxRetries       = 2 // Number of retries per API
+	tidalRetryDelay       = 500 * time.Millisecond
+)
+
+// fetchTidalURLWithRetry fetches download URL from a single Tidal API with retry logic
+func fetchTidalURLWithRetry(api string, trackID int64, quality string, timeout time.Duration) (TidalDownloadInfo, error) {
+	var lastErr error
+	retryDelay := tidalRetryDelay
+
+	for attempt := 0; attempt <= tidalMaxRetries; attempt++ {
+		if attempt > 0 {
+			GoLog("[Tidal] Retry %d/%d for %s after %v\n", attempt, tidalMaxRetries, api, retryDelay)
+			time.Sleep(retryDelay)
+			retryDelay *= 2 // Exponential backoff
+		}
+
+		client := NewHTTPClientWithTimeout(timeout)
+		reqURL := fmt.Sprintf("%s/track/?id=%d&quality=%s", api, trackID, quality)
+
+		req, err := http.NewRequest("GET", reqURL, nil)
+		if err != nil {
+			lastErr = err
+			continue
+		}
+
+		resp, err := client.Do(req)
+		if err != nil {
+			lastErr = err
+			// Check for retryable errors (timeout, connection reset)
+			errStr := strings.ToLower(err.Error())
+			if strings.Contains(errStr, "timeout") ||
+				strings.Contains(errStr, "reset") ||
+				strings.Contains(errStr, "connection refused") ||
+				strings.Contains(errStr, "eof") {
+				continue // Retry
+			}
+			break // Non-retryable error
+		}
+		// Server errors are retryable
+		if resp.StatusCode >= 500 {
+			io.Copy(io.Discard, resp.Body)
+			resp.Body.Close()
+			lastErr = fmt.Errorf("HTTP %d", resp.StatusCode)
+			continue
+		}
+
+		// 429 rate limit - wait and retry
+		if resp.StatusCode == 429 {
+			io.Copy(io.Discard, resp.Body)
+			resp.Body.Close()
+			lastErr = fmt.Errorf("rate limited")
+			retryDelay = 2 * time.Second // Wait longer for rate limit
+			continue
+		}
+
+		if resp.StatusCode != 200 {
+			io.Copy(io.Discard, resp.Body)
+			resp.Body.Close()
+			return TidalDownloadInfo{}, fmt.Errorf("HTTP %d", resp.StatusCode)
+		}
+
+		body, err := io.ReadAll(resp.Body)
+		resp.Body.Close()
+		if err != nil {
+			lastErr = err
+			continue
+		}
+
+		// Try V2 response format (with manifest)
+		var v2Response TidalAPIResponseV2
+		if err := json.Unmarshal(body, &v2Response); err == nil && v2Response.Data.Manifest != "" {
+			if v2Response.Data.AssetPresentation == "PREVIEW" {
+				return TidalDownloadInfo{}, fmt.Errorf("returned PREVIEW instead of FULL")
+			}
+
+			return TidalDownloadInfo{
+				URL:        "MANIFEST:" + v2Response.Data.Manifest,
+				BitDepth:   v2Response.Data.BitDepth,
+				SampleRate: v2Response.Data.SampleRate,
+			}, nil
+		}
+
+		// Try V1 response format
+		var v1Responses []struct {
+			OriginalTrackURL string `json:"OriginalTrackUrl"`
+		}
+		if err := json.Unmarshal(body, &v1Responses); err == nil {
+			for _, item := range v1Responses {
+				if item.OriginalTrackURL != "" {
+					return TidalDownloadInfo{
+						URL:        item.OriginalTrackURL,
+						BitDepth:   16,
+						SampleRate: 44100,
+					}, nil
+				}
+			}
+		}
+
+		return TidalDownloadInfo{}, fmt.Errorf("no download URL or manifest in response")
+	}
+
+	if lastErr != nil {
+		return TidalDownloadInfo{}, lastErr
+	}
+	return TidalDownloadInfo{}, fmt.Errorf("all retries failed")
+}
+
 func getDownloadURLParallel(apis []string, trackID int64, quality string) (string, TidalDownloadInfo, error) {
 	if len(apis) == 0 {
 		return "", TidalDownloadInfo{}, fmt.Errorf("no APIs available")
 	}

-	GoLog("[Tidal] Requesting download URL from %d APIs in parallel...\n", len(apis))
+	GoLog("[Tidal] Requesting download URL from %d APIs in parallel (with retry)...\n", len(apis))

 	resultChan := make(chan tidalAPIResult, len(apis))
 	startTime := time.Now()
@@ -598,69 +706,13 @@ func getDownloadURLParallel(apis []string, trackID int64, quality string) (strin
 	for _, apiURL := range apis {
 		go func(api string) {
 			reqStart := time.Now()
-
-			client := NewHTTPClientWithTimeout(15 * time.Second)
-
-			reqURL := fmt.Sprintf("%s/track/?id=%d&quality=%s", api, trackID, quality)
-
-			req, err := http.NewRequest("GET", reqURL, nil)
-			if err != nil {
-				resultChan <- tidalAPIResult{apiURL: api, err: err, duration: time.Since(reqStart)}
-				return
+			info, err := fetchTidalURLWithRetry(api, trackID, quality, tidalAPITimeoutMobile)
+			resultChan <- tidalAPIResult{
+				apiURL:   api,
+				info:     info,
+				err:      err,
+				duration: time.Since(reqStart),
 			}
-
-			resp, err := client.Do(req)
-			if err != nil {
-				resultChan <- tidalAPIResult{apiURL: api, err: err, duration: time.Since(reqStart)}
-				return
-			}
-			defer resp.Body.Close()
-
-			if resp.StatusCode != 200 {
-				resultChan <- tidalAPIResult{apiURL: api, err: fmt.Errorf("HTTP %d", resp.StatusCode), duration: time.Since(reqStart)}
-				return
-			}
-
-			body, err := io.ReadAll(resp.Body)
-			if err != nil {
-				resultChan <- tidalAPIResult{apiURL: api, err: err, duration: time.Since(reqStart)}
-				return
-			}
-
-			var v2Response TidalAPIResponseV2
-			if err := json.Unmarshal(body, &v2Response); err == nil && v2Response.Data.Manifest != "" {
-				if v2Response.Data.AssetPresentation == "PREVIEW" {
-					resultChan <- tidalAPIResult{apiURL: api, err: fmt.Errorf("returned PREVIEW instead of FULL"), duration: time.Since(reqStart)}
-					return
-				}
-
-				info := TidalDownloadInfo{
-					URL:        "MANIFEST:" + v2Response.Data.Manifest,
-					BitDepth:   v2Response.Data.BitDepth,
-					SampleRate: v2Response.Data.SampleRate,
-				}
-				resultChan <- tidalAPIResult{apiURL: api, info: info, err: nil, duration: time.Since(reqStart)}
-				return
-			}
-
-			var v1Responses []struct {
-				OriginalTrackURL string `json:"OriginalTrackUrl"`
-			}
-			if err := json.Unmarshal(body, &v1Responses); err == nil {
-				for _, item := range v1Responses {
-					if item.OriginalTrackURL != "" {
-						info := TidalDownloadInfo{
-							URL:        item.OriginalTrackURL,
-							BitDepth:   16,
-							SampleRate: 44100,
-						}
-						resultChan <- tidalAPIResult{apiURL: api, info: info, err: nil, duration: time.Since(reqStart)}
-						return
-					}
-				}
-			}
-
-			resultChan <- tidalAPIResult{apiURL: api, err: fmt.Errorf("no download URL or manifest in response"), duration: time.Since(reqStart)}
 		}(apiURL)
 	}

@@ -787,6 +839,10 @@ func parseManifest(manifestB64 string) (directURL string, initURL string, mediaU
 		GoLog("[Tidal] Total segments from regex: %d\n", segmentCount)
 	}

+	if segmentCount == 0 {
+		return "", "", nil, fmt.Errorf("no segments found in manifest")
+	}
+
 	for i := 1; i <= segmentCount; i++ {
 		mediaURL := strings.ReplaceAll(mediaTemplate, "$Number$", fmt.Sprintf("%d", i))
 		mediaURLs = append(mediaURLs, mediaURL)
@@ -795,7 +851,7 @@ func parseManifest(manifestB64 string) (directURL string, initURL string, mediaU
 	return "", initURL, mediaURLs, nil
 }

-func (t *TidalDownloader) DownloadFile(downloadURL, outputPath, itemID string) error {
+func (t *TidalDownloader) DownloadFile(downloadURL, outputPath string, outputFD int, itemID string) error {
 	ctx := context.Background()

 	if strings.HasPrefix(downloadURL, "MANIFEST:") {
@@ -808,7 +864,7 @@ func (t *TidalDownloader) DownloadFile(downloadURL, outputPath, itemID string) e
 		if isDownloadCancelled(itemID) {
 			return ErrDownloadCancelled
 		}
-		return t.downloadFromManifest(ctx, strings.TrimPrefix(downloadURL, "MANIFEST:"), outputPath, itemID)
+		return t.downloadFromManifest(ctx, strings.TrimPrefix(downloadURL, "MANIFEST:"), outputPath, outputFD, itemID)
 	}

 	if itemID != "" {
@@ -845,7 +901,7 @@ func (t *TidalDownloader) DownloadFile(downloadURL, outputPath, itemID string) e
 		SetItemBytesTotal(itemID, expectedSize)
 	}

-	out, err := os.Create(outputPath)
+	out, err := openOutputForWrite(outputPath, outputFD)
 	if err != nil {
 		return err
 	}
@@ -864,30 +920,30 @@ func (t *TidalDownloader) DownloadFile(downloadURL, outputPath, itemID string) e
 	closeErr := out.Close()

 	if err != nil {
-		os.Remove(outputPath)
+		cleanupOutputOnError(outputPath, outputFD)
 		if isDownloadCancelled(itemID) {
 			return ErrDownloadCancelled
 		}
 		return fmt.Errorf("download interrupted: %w", err)
 	}
 	if flushErr != nil {
-		os.Remove(outputPath)
+		cleanupOutputOnError(outputPath, outputFD)
 		return fmt.Errorf("failed to flush buffer: %w", flushErr)
 	}
 	if closeErr != nil {
-		os.Remove(outputPath)
+		cleanupOutputOnError(outputPath, outputFD)
 		return fmt.Errorf("failed to close file: %w", closeErr)
 	}

 	if expectedSize > 0 && written != expectedSize {
-		os.Remove(outputPath)
+		cleanupOutputOnError(outputPath, outputFD)
 		return fmt.Errorf("incomplete download: expected %d bytes, got %d bytes", expectedSize, written)
 	}

 	return nil
 }

-func (t *TidalDownloader) downloadFromManifest(ctx context.Context, manifestB64, outputPath, itemID string) error {
+func (t *TidalDownloader) downloadFromManifest(ctx context.Context, manifestB64, outputPath string, outputFD int, itemID string) error {
 	fmt.Println("[Tidal] Parsing manifest...")
 	directURL, initURL, mediaURLs, err := parseManifest(manifestB64)
 	if err != nil {
@@ -932,7 +988,7 @@ func (t *TidalDownloader) downloadFromManifest(ctx context.Context, manifestB64,
 			SetItemBytesTotal(itemID, expectedSize)
 		}

-		out, err := os.Create(outputPath)
+		out, err := openOutputForWrite(outputPath, outputFD)
 		if err != nil {
 			return fmt.Errorf("failed to create file: %w", err)
 		}
@@ -948,19 +1004,19 @@ func (t *TidalDownloader) downloadFromManifest(ctx context.Context, manifestB64,
 		closeErr := out.Close()

 		if err != nil {
-			os.Remove(outputPath)
+			cleanupOutputOnError(outputPath, outputFD)
 			if isDownloadCancelled(itemID) {
 				return ErrDownloadCancelled
 			}
 			return fmt.Errorf("download interrupted: %w", err)
 		}
 		if closeErr != nil {
-			os.Remove(outputPath)
+			cleanupOutputOnError(outputPath, outputFD)
 			return fmt.Errorf("failed to close file: %w", closeErr)
 		}

 		if expectedSize > 0 && written != expectedSize {
-			os.Remove(outputPath)
+			cleanupOutputOnError(outputPath, outputFD)
 			return fmt.Errorf("incomplete download: expected %d bytes, got %d bytes", expectedSize, written)
 		}

@@ -968,17 +1024,20 @@ func (t *TidalDownloader) downloadFromManifest(ctx context.Context, manifestB64,
 	}

 	// For DASH format, determine correct M4A path
-	// If outputPath already ends with .m4a, use it directly
-	// Otherwise, convert .flac to .m4a
+	// If outputPath already ends with .m4a, use it directly.
+	// If outputPath ends with .flac, convert .flac to .m4a.
+	// Otherwise (e.g., SAF /proc/self/fd/*), use outputPath as-is.
 	var m4aPath string
 	if strings.HasSuffix(outputPath, ".m4a") {
 		m4aPath = outputPath
-	} else {
+	} else if strings.HasSuffix(outputPath, ".flac") {
 		m4aPath = strings.TrimSuffix(outputPath, ".flac") + ".m4a"
+	} else {
+		m4aPath = outputPath
 	}
 	GoLog("[Tidal] DASH format - downloading %d segments directly to: %s\n", len(mediaURLs), m4aPath)

-	out, err := os.Create(m4aPath)
+	out, err := openOutputForWrite(m4aPath, outputFD)
 	if err != nil {
 		GoLog("[Tidal] Failed to create M4A file: %v\n", err)
 		return fmt.Errorf("failed to create M4A file: %w", err)
@@ -987,20 +1046,20 @@ func (t *TidalDownloader) downloadFromManifest(ctx context.Context, manifestB64,
 	GoLog("[Tidal] Downloading init segment...\n")
 	if isDownloadCancelled(itemID) {
 		out.Close()
-		os.Remove(m4aPath)
+		cleanupOutputOnError(m4aPath, outputFD)
 		return ErrDownloadCancelled
 	}
 	req, err := http.NewRequestWithContext(ctx, "GET", initURL, nil)
 	if err != nil {
 		out.Close()
-		os.Remove(m4aPath)
+		cleanupOutputOnError(m4aPath, outputFD)
 		GoLog("[Tidal] Init segment request failed: %v\n", err)
 		return fmt.Errorf("failed to create init segment request: %w", err)
 	}
 	resp, err := client.Do(req)
 	if err != nil {
 		out.Close()
-		os.Remove(m4aPath)
+		cleanupOutputOnError(m4aPath, outputFD)
 		if isDownloadCancelled(itemID) {
 			return ErrDownloadCancelled
 		}
@@ -1010,7 +1069,7 @@ func (t *TidalDownloader) downloadFromManifest(ctx context.Context, manifestB64,
 	if resp.StatusCode != 200 {
 		resp.Body.Close()
 		out.Close()
-		os.Remove(m4aPath)
+		cleanupOutputOnError(m4aPath, outputFD)
 		GoLog("[Tidal] Init segment HTTP error: %d\n", resp.StatusCode)
 		return fmt.Errorf("init segment download failed with status %d", resp.StatusCode)
 	}
@@ -1018,7 +1077,7 @@ func (t *TidalDownloader) downloadFromManifest(ctx context.Context, manifestB64,
 	resp.Body.Close()
 	if err != nil {
 		out.Close()
-		os.Remove(m4aPath)
+		cleanupOutputOnError(m4aPath, outputFD)
 		if isDownloadCancelled(itemID) {
 			return ErrDownloadCancelled
 		}
@@ -1030,7 +1089,7 @@ func (t *TidalDownloader) downloadFromManifest(ctx context.Context, manifestB64,
 	for i, mediaURL := range mediaURLs {
 		if isDownloadCancelled(itemID) {
 			out.Close()
-			os.Remove(m4aPath)
+			cleanupOutputOnError(m4aPath, outputFD)
 			return ErrDownloadCancelled
 		}

@@ -1046,14 +1105,14 @@ func (t *TidalDownloader) downloadFromManifest(ctx context.Context, manifestB64,
 		req, err := http.NewRequestWithContext(ctx, "GET", mediaURL, nil)
 		if err != nil {
 			out.Close()
-			os.Remove(m4aPath)
+			cleanupOutputOnError(m4aPath, outputFD)
 			GoLog("[Tidal] Segment %d request failed: %v\n", i+1, err)
 			return fmt.Errorf("failed to create segment %d request: %w", i+1, err)
 		}
 		resp, err := client.Do(req)
 		if err != nil {
 			out.Close()
-			os.Remove(m4aPath)
+			cleanupOutputOnError(m4aPath, outputFD)
 			if isDownloadCancelled(itemID) {
 				return ErrDownloadCancelled
 			}
@@ -1063,7 +1122,7 @@ func (t *TidalDownloader) downloadFromManifest(ctx context.Context, manifestB64,
 		if resp.StatusCode != 200 {
 			resp.Body.Close()
 			out.Close()
-			os.Remove(m4aPath)
+			cleanupOutputOnError(m4aPath, outputFD)
 			GoLog("[Tidal] Segment %d HTTP error: %d\n", i+1, resp.StatusCode)
 			return fmt.Errorf("segment %d download failed with status %d", i+1, resp.StatusCode)
 		}
@@ -1071,7 +1130,7 @@ func (t *TidalDownloader) downloadFromManifest(ctx context.Context, manifestB64,
 		resp.Body.Close()
 		if err != nil {
 			out.Close()
-			os.Remove(m4aPath)
+			cleanupOutputOnError(m4aPath, outputFD)
 			if isDownloadCancelled(itemID) {
 				return ErrDownloadCancelled
 			}
@@ -1081,7 +1140,7 @@ func (t *TidalDownloader) downloadFromManifest(ctx context.Context, manifestB64,
 	}

 	if err := out.Close(); err != nil {
-		os.Remove(m4aPath)
+		cleanupOutputOnError(m4aPath, outputFD)
 		GoLog("[Tidal] Failed to close M4A file: %v\n", err)
 		return fmt.Errorf("failed to close M4A file: %w", err)
 	}
@@ -1350,8 +1409,11 @@ func isLatinScript(s string) bool {
 func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 	downloader := NewTidalDownloader()

-	if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
-		return TidalDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
+	isSafOutput := isFDOutput(req.OutputFD) || strings.TrimSpace(req.OutputPath) != ""
+	if !isSafOutput {
+		if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
+			return TidalDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
+		}
 	}

 	expectedDurationSec := req.DurationMS / 1000
@@ -1407,49 +1469,83 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {

 	if track == nil && req.SpotifyID != "" {
 		GoLog("[Tidal] ISRC search failed, trying SongLink...\n")
-		var tidalURL string
-		var slErr error
+
+		var trackID int64
+		var gotTidalID bool

 		if strings.HasPrefix(req.SpotifyID, "deezer:") {
 			deezerID := strings.TrimPrefix(req.SpotifyID, "deezer:")
 			GoLog("[Tidal] Using Deezer ID for SongLink lookup: %s\n", deezerID)
 			songlink := NewSongLinkClient()
-			tidalURL, slErr = songlink.GetTidalURLFromDeezer(deezerID)
+			availability, slErr := songlink.CheckAvailabilityFromDeezer(deezerID)
+			if slErr == nil && availability != nil && availability.TidalID != "" {
+				if _, parseErr := fmt.Sscanf(availability.TidalID, "%d", &trackID); parseErr == nil && trackID > 0 {
+					GoLog("[Tidal] Got Tidal ID %d directly from SongLink\n", trackID)
+					gotTidalID = true
+				}
+			}
+			// Fallback to URL parsing if TidalID not in struct
+			if !gotTidalID && availability != nil && availability.TidalURL != "" {
+				var idErr error
+				trackID, idErr = downloader.GetTrackIDFromURL(availability.TidalURL)
+				if idErr == nil && trackID > 0 {
+					GoLog("[Tidal] Got Tidal ID %d from URL parsing\n", trackID)
+					gotTidalID = true
+				}
+			}
 		} else {
-			tidalURL, slErr = downloader.GetTidalURLFromSpotify(req.SpotifyID)
+			songlink := NewSongLinkClient()
+			availability, slErr := songlink.CheckTrackAvailability(req.SpotifyID, req.ISRC)
+			if slErr == nil && availability != nil && availability.TidalID != "" {
+				if _, parseErr := fmt.Sscanf(availability.TidalID, "%d", &trackID); parseErr == nil && trackID > 0 {
+					GoLog("[Tidal] Got Tidal ID %d directly from SongLink\n", trackID)
+					gotTidalID = true
+				}
+			}
+			// Fallback to URL parsing if TidalID not in struct
+			if !gotTidalID && availability != nil && availability.TidalURL != "" {
+				var idErr error
+				trackID, idErr = downloader.GetTrackIDFromURL(availability.TidalURL)
+				if idErr == nil && trackID > 0 {
+					GoLog("[Tidal] Got Tidal ID %d from URL parsing\n", trackID)
+					gotTidalID = true
+				}
+			}
 		}

-		if slErr == nil && tidalURL != "" {
-			trackID, idErr := downloader.GetTrackIDFromURL(tidalURL)
-			if idErr == nil {
-				track, err = downloader.GetTrackInfoByID(trackID)
-				if track != nil {
-					tidalArtist := track.Artist.Name
-					if len(track.Artists) > 0 {
-						var artistNames []string
-						for _, a := range track.Artists {
-							artistNames = append(artistNames, a.Name)
-						}
-						tidalArtist = strings.Join(artistNames, ", ")
+		if gotTidalID && trackID > 0 {
+			track, err = downloader.GetTrackInfoByID(trackID)
+			if track != nil {
+				tidalArtist := track.Artist.Name
+				if len(track.Artists) > 0 {
+					var artistNames []string
+					for _, a := range track.Artists {
+						artistNames = append(artistNames, a.Name)
 					}
+					tidalArtist = strings.Join(artistNames, ", ")
+				}

-					if !artistsMatch(req.ArtistName, tidalArtist) {
-						GoLog("[Tidal] Artist mismatch from SongLink: expected '%s', got '%s'. Rejecting.\n",
-							req.ArtistName, tidalArtist)
-						track = nil
-					}
+				if !artistsMatch(req.ArtistName, tidalArtist) {
+					GoLog("[Tidal] Artist mismatch from SongLink: expected '%s', got '%s'. Rejecting.\n",
+						req.ArtistName, tidalArtist)
+					track = nil
+				}

-					if track != nil && expectedDurationSec > 0 {
-						durationDiff := track.Duration - expectedDurationSec
-						if durationDiff < 0 {
-							durationDiff = -durationDiff
-						}
-						if durationDiff > 3 {
-							GoLog("[Tidal] Duration mismatch from SongLink: expected %ds, got %ds. Rejecting.\n",
-								expectedDurationSec, track.Duration)
-							track = nil // Reject this match
-						}
+				if track != nil && expectedDurationSec > 0 {
+					durationDiff := track.Duration - expectedDurationSec
+					if durationDiff < 0 {
+						durationDiff = -durationDiff
 					}
+					if durationDiff > 3 {
+						GoLog("[Tidal] Duration mismatch from SongLink: expected %ds, got %ds. Rejecting.\n",
+							expectedDurationSec, track.Duration)
+						track = nil // Reject this match
+					}
+				}
+
+				// Cache for future use
+				if track != nil && req.ISRC != "" {
+					GetTrackIDCache().SetTidal(req.ISRC, track.ID)
 				}
 			}
 		}
@@ -1513,34 +1609,56 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		"album":  req.AlbumName,
 		"track":  req.TrackNumber,
 		"year":   extractYear(req.ReleaseDate),
+		"date":   req.ReleaseDate,
 		"disc":   req.DiscNumber,
 	})

-	var outputPath string
-	var m4aPath string
-	if quality == "HIGH" {
-		filename = sanitizeFilename(filename) + ".m4a"
-		outputPath = filepath.Join(req.OutputDir, filename)
-		m4aPath = outputPath
-	} else {
-		filename = sanitizeFilename(filename) + ".flac"
-		outputPath = filepath.Join(req.OutputDir, filename)
-		m4aPath = strings.TrimSuffix(outputPath, ".flac") + ".m4a"
+	outputExt := strings.TrimSpace(req.OutputExt)
+	if outputExt == "" {
+		if quality == "HIGH" {
+			outputExt = ".m4a"
+		} else {
+			outputExt = ".flac"
+		}
+	} else if !strings.HasPrefix(outputExt, ".") {
+		outputExt = "." + outputExt
 	}

-	if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
-		return TidalDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
-	}
-	if quality != "HIGH" {
-		if fileInfo, statErr := os.Stat(m4aPath); statErr == nil && fileInfo.Size() > 0 {
-			return TidalDownloadResult{FilePath: "EXISTS:" + m4aPath}, nil
+	var outputPath string
+	var m4aPath string
+	if isSafOutput {
+		outputPath = strings.TrimSpace(req.OutputPath)
+		if outputPath == "" && isFDOutput(req.OutputFD) {
+			outputPath = fmt.Sprintf("/proc/self/fd/%d", req.OutputFD)
+		}
+		m4aPath = outputPath
+	} else {
+		if outputExt == ".m4a" || quality == "HIGH" {
+			filename = sanitizeFilename(filename) + ".m4a"
+			outputPath = filepath.Join(req.OutputDir, filename)
+			m4aPath = outputPath
+		} else {
+			filename = sanitizeFilename(filename) + ".flac"
+			outputPath = filepath.Join(req.OutputDir, filename)
+			m4aPath = strings.TrimSuffix(outputPath, ".flac") + ".m4a"
+		}
+
+		if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
+			return TidalDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
+		}
+		if quality != "HIGH" {
+			if fileInfo, statErr := os.Stat(m4aPath); statErr == nil && fileInfo.Size() > 0 {
+				return TidalDownloadResult{FilePath: "EXISTS:" + m4aPath}, nil
+			}
 		}
 	}

-	tmpPath := outputPath + ".m4a.tmp"
-	if _, err := os.Stat(tmpPath); err == nil {
-		GoLog("[Tidal] Cleaning up leftover temp file: %s\n", tmpPath)
-		os.Remove(tmpPath)
+	if !isSafOutput {
+		tmpPath := outputPath + ".m4a.tmp"
+		if _, err := os.Stat(tmpPath); err == nil {
+			GoLog("[Tidal] Cleaning up leftover temp file: %s\n", tmpPath)
+			os.Remove(tmpPath)
+		}
 	}

 	GoLog("[Tidal] Using quality: %s\n", quality)
@@ -1575,7 +1693,7 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		return "Direct URL"
 	}())

-	if err := downloader.DownloadFile(downloadInfo.URL, outputPath, req.ItemID); err != nil {
+	if err := downloader.DownloadFile(downloadInfo.URL, outputPath, req.OutputFD, req.ItemID); err != nil {
 		if errors.Is(err, ErrDownloadCancelled) {
 			return TidalDownloadResult{}, ErrDownloadCancelled
 		}
@@ -1592,11 +1710,13 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 	}

 	actualOutputPath := outputPath
-	if _, err := os.Stat(m4aPath); err == nil {
-		actualOutputPath = m4aPath
-		GoLog("[Tidal] File saved as M4A (DASH stream): %s\n", actualOutputPath)
-	} else if _, err := os.Stat(outputPath); err != nil {
-		return TidalDownloadResult{}, fmt.Errorf("download completed but file not found at %s or %s", outputPath, m4aPath)
+	if !isSafOutput {
+		if _, err := os.Stat(m4aPath); err == nil {
+			actualOutputPath = m4aPath
+			GoLog("[Tidal] File saved as M4A (DASH stream): %s\n", actualOutputPath)
+		} else if _, err := os.Stat(outputPath); err != nil {
+			return TidalDownloadResult{}, fmt.Errorf("download completed but file not found at %s or %s", outputPath, m4aPath)
+		}
 	}

 	releaseDate := req.ReleaseDate
@@ -1635,7 +1755,15 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		GoLog("[Tidal] Using parallel-fetched cover (%d bytes)\n", len(coverData))
 	}

-	if strings.HasSuffix(actualOutputPath, ".flac") {
+	actualExt := outputExt
+	if strings.HasPrefix(downloadInfo.URL, "MANIFEST:") {
+		actualExt = ".m4a"
+	}
+	if actualExt == "" && !isSafOutput {
+		actualExt = strings.ToLower(filepath.Ext(actualOutputPath))
+	}
+
+	if (isSafOutput && actualExt == ".flac") || (!isSafOutput && strings.HasSuffix(actualOutputPath, ".flac")) {
 		if err := EmbedMetadataWithCoverData(actualOutputPath, metadata, coverData); err != nil {
 			fmt.Printf("Warning: failed to embed metadata: %v\n", err)
 		}
@@ -1646,7 +1774,7 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 				lyricsMode = "embed"
 			}

-			if lyricsMode == "external" || lyricsMode == "both" {
+			if !isSafOutput && (lyricsMode == "external" || lyricsMode == "both") {
 				GoLog("[Tidal] Saving external LRC file...\n")
 				if lrcPath, lrcErr := SaveLRCFile(actualOutputPath, parallelResult.LyricsLRC); lrcErr != nil {
 					GoLog("[Tidal] Warning: failed to save LRC file: %v\n", lrcErr)
@@ -1666,7 +1794,7 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		} else if req.EmbedLyrics {
 			fmt.Println("[Tidal] No lyrics available from parallel fetch")
 		}
-	} else if strings.HasSuffix(actualOutputPath, ".m4a") {
+	} else if (isSafOutput && actualExt == ".m4a") || (!isSafOutput && strings.HasSuffix(actualOutputPath, ".m4a")) {
 		if quality == "HIGH" {
 			GoLog("[Tidal] HIGH quality M4A - skipping metadata embedding (file from server is already valid)\n")

@@ -1676,7 +1804,7 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 					lyricsMode = "embed"
 				}

-				if lyricsMode == "external" || lyricsMode == "both" {
+				if !isSafOutput && (lyricsMode == "external" || lyricsMode == "both") {
 					GoLog("[Tidal] Saving external LRC file for M4A (mode: %s)...\n", lyricsMode)
 					if lrcPath, lrcErr := SaveLRCFile(actualOutputPath, parallelResult.LyricsLRC); lrcErr != nil {
 						GoLog("[Tidal] Warning: failed to save LRC file: %v\n", lrcErr)
@@ -1690,7 +1818,9 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		}
 	}

-	AddToISRCIndex(req.OutputDir, req.ISRC, actualOutputPath)
+	if !isSafOutput {
+		AddToISRCIndex(req.OutputDir, req.ISRC, actualOutputPath)
+	}

 	bitDepth := downloadInfo.BitDepth
 	sampleRate := downloadInfo.SampleRate
@@ -1698,15 +1828,9 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 	if quality == "HIGH" {
 		bitDepth = 0
 		sampleRate = 44100
-		if parallelResult != nil && parallelResult.LyricsLRC != "" {
-			lyricsMode := req.LyricsMode
-			if lyricsMode == "" {
-				lyricsMode = "embed"
-			}
-			if lyricsMode == "embed" || lyricsMode == "both" {
-				lyricsLRC = parallelResult.LyricsLRC
-			}
-		}
+	}
+	if req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
+		lyricsLRC = parallelResult.LyricsLRC
 	}

 	return TidalDownloadResult{
@@ -1723,3 +1847,40 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		LyricsLRC:   lyricsLRC,
 	}, nil
 }
+
+func parseTidalURL(input string) (string, string, error) {
+	trimmed := strings.TrimSpace(input)
+	if trimmed == "" {
+		return "", "", fmt.Errorf("empty URL")
+	}
+
+	parsed, err := url.Parse(trimmed)
+	if err != nil {
+		return "", "", err
+	}
+
+	if parsed.Host != "tidal.com" && parsed.Host != "listen.tidal.com" && parsed.Host != "www.tidal.com" {
+		return "", "", fmt.Errorf("not a Tidal URL")
+	}
+
+	parts := strings.Split(strings.Trim(parsed.Path, "/"), "/")
+
+	// Handle /browse/track/123 format
+	if len(parts) > 0 && parts[0] == "browse" {
+		parts = parts[1:]
+	}
+
+	if len(parts) < 2 {
+		return "", "", fmt.Errorf("invalid Tidal URL format")
+	}
+
+	resourceType := parts[0]
+	resourceID := parts[1]
+
+	switch resourceType {
+	case "track", "album", "artist", "playlist":
+		return resourceType, resourceID, nil
+	default:
+		return "", "", fmt.Errorf("unsupported Tidal resource type: %s", resourceType)
+	}
+}
@@ -0,0 +1,567 @@
+// Package gobackend - YouTube download via Cobalt API (lossy-only provider)
+package gobackend
+
+import (
+	"bufio"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"sync"
+	"time"
+)
+
+type YouTubeDownloader struct {
+	client *http.Client
+	apiURL string
+	mu     sync.Mutex
+}
+
+var (
+	globalYouTubeDownloader *YouTubeDownloader
+	youtubeDownloaderOnce   sync.Once
+)
+
+type YouTubeQuality string
+
+const (
+	YouTubeQualityOpus256 YouTubeQuality = "opus_256"
+	YouTubeQualityMP3320  YouTubeQuality = "mp3_320"
+)
+
+type CobaltRequest struct {
+	URL             string `json:"url"`
+	AudioBitrate    string `json:"audioBitrate,omitempty"`
+	AudioFormat     string `json:"audioFormat,omitempty"`
+	DownloadMode    string `json:"downloadMode,omitempty"`
+	FilenameStyle   string `json:"filenameStyle,omitempty"`
+	DisableMetadata bool   `json:"disableMetadata,omitempty"`
+}
+
+type CobaltResponse struct {
+	Status   string `json:"status"`
+	URL      string `json:"url,omitempty"`
+	Filename string `json:"filename,omitempty"`
+	Error    *struct {
+		Code    string `json:"code"`
+		Context *struct {
+			Service string `json:"service,omitempty"`
+			Limit   int    `json:"limit,omitempty"`
+		} `json:"context,omitempty"`
+	} `json:"error,omitempty"`
+}
+
+type YouTubeDownloadResult struct {
+	FilePath    string
+	Title       string
+	Artist      string
+	Album       string
+	ReleaseDate string
+	TrackNumber int
+	DiscNumber  int
+	ISRC        string
+	Format      string // "opus" or "mp3"
+	Bitrate     int
+	LyricsLRC   string
+	CoverData   []byte
+}
+
+func NewYouTubeDownloader() *YouTubeDownloader {
+	youtubeDownloaderOnce.Do(func() {
+		globalYouTubeDownloader = &YouTubeDownloader{
+			client: NewHTTPClientWithTimeout(120 * time.Second),
+			apiURL: "https://api.qwkuns.me",
+		}
+	})
+	return globalYouTubeDownloader
+}
+
+// SearchYouTube returns a YouTube Music search URL for the given track
+func (y *YouTubeDownloader) SearchYouTube(trackName, artistName string) (string, error) {
+	query := fmt.Sprintf("%s %s", artistName, trackName)
+	searchQuery := url.QueryEscape(query)
+
+	GoLog("[YouTube] Search query: %s\n", query)
+
+	youtubeMusicURL := fmt.Sprintf("https://music.youtube.com/search?q=%s", searchQuery)
+
+	return youtubeMusicURL, nil
+}
+
+func (y *YouTubeDownloader) GetDownloadURL(youtubeURL string, quality YouTubeQuality) (*CobaltResponse, error) {
+	y.mu.Lock()
+	defer y.mu.Unlock()
+
+	var audioFormat string
+	var audioBitrate string
+
+	switch quality {
+	case YouTubeQualityOpus256:
+		audioFormat = "opus"
+		audioBitrate = "256"
+	case YouTubeQualityMP3320:
+		audioFormat = "mp3"
+		audioBitrate = "320"
+	default:
+		audioFormat = "mp3"
+		audioBitrate = "320"
+	}
+
+	// Try SpotubeDL first (primary)
+	videoID, extractErr := ExtractYouTubeVideoID(youtubeURL)
+	if extractErr == nil {
+		GoLog("[YouTube] Requesting from SpotubeDL: videoID=%s (format: %s, bitrate: %s)\n",
+			videoID, audioFormat, audioBitrate)
+
+		resp, err := y.requestSpotubeDL(videoID, audioFormat, audioBitrate)
+		if err == nil {
+			return resp, nil
+		}
+		GoLog("[YouTube] SpotubeDL failed: %v, trying Cobalt fallback...\n", err)
+	} else {
+		GoLog("[YouTube] Could not extract video ID: %v, skipping SpotubeDL\n", extractErr)
+	}
+
+	// Fallback: direct Cobalt API (api.qwkuns.me)
+	cobaltURL := toYouTubeMusicURL(youtubeURL)
+	GoLog("[YouTube] Requesting from Cobalt API: %s (format: %s, bitrate: %s)\n",
+		cobaltURL, audioFormat, audioBitrate)
+
+	resp, err := y.requestCobaltDirect(cobaltURL, audioFormat, audioBitrate)
+	if err != nil {
+		return nil, fmt.Errorf("all download methods failed: spotubedl: extractErr=%v, cobalt: %v", extractErr, err)
+	}
+
+	return resp, nil
+}
+
+// requestCobaltDirect sends a download request to the primary Cobalt API.
+func (y *YouTubeDownloader) requestCobaltDirect(videoURL, audioFormat, audioBitrate string) (*CobaltResponse, error) {
+	reqBody := CobaltRequest{
+		URL:             videoURL,
+		AudioFormat:     audioFormat,
+		AudioBitrate:    audioBitrate,
+		DownloadMode:    "audio",
+		FilenameStyle:   "basic",
+		DisableMetadata: true,
+	}
+
+	jsonData, err := json.Marshal(reqBody)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal request: %w", err)
+	}
+
+	req, err := http.NewRequest("POST", y.apiURL, strings.NewReader(string(jsonData)))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Accept", "application/json")
+
+	resp, err := DoRequestWithUserAgent(y.client, req)
+	if err != nil {
+		return nil, fmt.Errorf("cobalt API request failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	GoLog("[YouTube] Cobalt API response status: %d\n", resp.StatusCode)
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("cobalt API returned status %d: %s", resp.StatusCode, string(body))
+	}
+
+	var cobaltResp CobaltResponse
+	if err := json.Unmarshal(body, &cobaltResp); err != nil {
+		return nil, fmt.Errorf("failed to parse response: %w", err)
+	}
+
+	if cobaltResp.Status == "error" && cobaltResp.Error != nil {
+		return nil, fmt.Errorf("cobalt error: %s", cobaltResp.Error.Code)
+	}
+
+	if cobaltResp.Status != "tunnel" && cobaltResp.Status != "redirect" {
+		return nil, fmt.Errorf("unexpected cobalt status: %s", cobaltResp.Status)
+	}
+
+	if cobaltResp.URL == "" {
+		return nil, fmt.Errorf("no download URL in response")
+	}
+
+	GoLog("[YouTube] Got download URL from Cobalt (status: %s)\n", cobaltResp.Status)
+	return &cobaltResp, nil
+}
+
+// requestSpotubeDL uses SpotubeDL as a Cobalt proxy (they handle auth to yt-dl.click instances).
+func (y *YouTubeDownloader) requestSpotubeDL(videoID, audioFormat, audioBitrate string) (*CobaltResponse, error) {
+	apiURL := fmt.Sprintf("https://spotubedl.com/api/download/%s?engine=v1&format=%s&quality=%s",
+		videoID, audioFormat, audioBitrate)
+
+	GoLog("[YouTube] Requesting from SpotubeDL: %s\n", apiURL)
+
+	req, err := http.NewRequest("GET", apiURL, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	req.Header.Set("Accept", "application/json")
+
+	resp, err := DoRequestWithUserAgent(y.client, req)
+	if err != nil {
+		return nil, fmt.Errorf("spotubedl request failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	GoLog("[YouTube] SpotubeDL response status: %d\n", resp.StatusCode)
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("spotubedl returned status %d: %s", resp.StatusCode, string(body))
+	}
+
+	var result struct {
+		URL string `json:"url"`
+	}
+	if err := json.Unmarshal(body, &result); err != nil {
+		return nil, fmt.Errorf("failed to parse spotubedl response: %w", err)
+	}
+
+	if result.URL == "" {
+		return nil, fmt.Errorf("no download URL from spotubedl")
+	}
+
+	GoLog("[YouTube] Got download URL from SpotubeDL\n")
+	return &CobaltResponse{
+		Status: "tunnel",
+		URL:    result.URL,
+	}, nil
+}
+
+func (y *YouTubeDownloader) DownloadFile(downloadURL, outputPath string, outputFD int, itemID string) error {
+	ctx := context.Background()
+
+	if itemID != "" {
+		StartItemProgress(itemID)
+		defer CompleteItemProgress(itemID)
+		ctx = initDownloadCancel(itemID)
+		defer clearDownloadCancel(itemID)
+	}
+
+	if isDownloadCancelled(itemID) {
+		return ErrDownloadCancelled
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "GET", downloadURL, nil)
+	if err != nil {
+		return fmt.Errorf("failed to create request: %w", err)
+	}
+
+	resp, err := DoRequestWithUserAgent(y.client, req)
+	if err != nil {
+		if isDownloadCancelled(itemID) {
+			return ErrDownloadCancelled
+		}
+		return fmt.Errorf("download request failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return fmt.Errorf("download failed: HTTP %d", resp.StatusCode)
+	}
+
+	expectedSize := resp.ContentLength
+	if expectedSize > 0 && itemID != "" {
+		SetItemBytesTotal(itemID, expectedSize)
+	}
+
+	out, err := openOutputForWrite(outputPath, outputFD)
+	if err != nil {
+		return fmt.Errorf("failed to create output file: %w", err)
+	}
+
+	bufWriter := bufio.NewWriterSize(out, 256*1024)
+
+	var written int64
+	if itemID != "" {
+		progressWriter := NewItemProgressWriter(bufWriter, itemID)
+		written, err = io.Copy(progressWriter, resp.Body)
+	} else {
+		written, err = io.Copy(bufWriter, resp.Body)
+	}
+
+	flushErr := bufWriter.Flush()
+	closeErr := out.Close()
+
+	if err != nil {
+		cleanupOutputOnError(outputPath, outputFD)
+		if isDownloadCancelled(itemID) {
+			return ErrDownloadCancelled
+		}
+		return fmt.Errorf("download interrupted: %w", err)
+	}
+	if flushErr != nil {
+		cleanupOutputOnError(outputPath, outputFD)
+		return fmt.Errorf("failed to flush buffer: %w", flushErr)
+	}
+	if closeErr != nil {
+		cleanupOutputOnError(outputPath, outputFD)
+		return fmt.Errorf("failed to close file: %w", closeErr)
+	}
+
+	if expectedSize > 0 && written != expectedSize {
+		cleanupOutputOnError(outputPath, outputFD)
+		return fmt.Errorf("incomplete download: expected %d bytes, got %d bytes", expectedSize, written)
+	}
+
+	GoLog("[YouTube] Download completed: %d bytes written\n", written)
+
+	return nil
+}
+
+func BuildYouTubeSearchURL(trackName, artistName string) string {
+	query := fmt.Sprintf("%s %s official audio", artistName, trackName)
+	return fmt.Sprintf("https://music.youtube.com/search?q=%s", url.QueryEscape(query))
+}
+
+func BuildYouTubeWatchURL(videoID string) string {
+	return fmt.Sprintf("https://music.youtube.com/watch?v=%s", videoID)
+}
+
+// isYouTubeVideoID checks if s is an 11-char YouTube video ID
+func isYouTubeVideoID(s string) bool {
+	if len(s) != 11 {
+		return false
+	}
+	for _, c := range s {
+		if !((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '-' || c == '_') {
+			return false
+		}
+	}
+	return true
+}
+
+func IsYouTubeURL(urlStr string) bool {
+	lower := strings.ToLower(urlStr)
+	return strings.Contains(lower, "youtube.com") ||
+		strings.Contains(lower, "youtu.be") ||
+		strings.Contains(lower, "music.youtube.com")
+}
+
+// toYouTubeMusicURL converts any YouTube URL to music.youtube.com format.
+// YouTube Music URLs bypass the login requirement that affects regular YouTube videos on Cobalt.
+func toYouTubeMusicURL(rawURL string) string {
+	videoID, err := ExtractYouTubeVideoID(rawURL)
+	if err != nil {
+		return rawURL
+	}
+	return fmt.Sprintf("https://music.youtube.com/watch?v=%s", videoID)
+}
+
+func ExtractYouTubeVideoID(urlStr string) (string, error) {
+	if strings.Contains(urlStr, "youtu.be/") {
+		parts := strings.Split(urlStr, "youtu.be/")
+		if len(parts) >= 2 {
+			videoID := strings.Split(parts[1], "?")[0]
+			videoID = strings.Split(videoID, "&")[0]
+			return strings.TrimSpace(videoID), nil
+		}
+	}
+
+	parsed, err := url.Parse(urlStr)
+	if err != nil {
+		return "", fmt.Errorf("invalid URL: %w", err)
+	}
+
+	// /watch?v=
+	if v := parsed.Query().Get("v"); v != "" {
+		return v, nil
+	}
+
+	// /embed/
+	if strings.Contains(parsed.Path, "/embed/") {
+		parts := strings.Split(parsed.Path, "/embed/")
+		if len(parts) >= 2 {
+			return strings.Split(parts[1], "/")[0], nil
+		}
+	}
+
+	// /v/
+	if strings.Contains(parsed.Path, "/v/") {
+		parts := strings.Split(parsed.Path, "/v/")
+		if len(parts) >= 2 {
+			return strings.Split(parts[1], "/")[0], nil
+		}
+	}
+
+	return "", fmt.Errorf("could not extract video ID from URL")
+}
+
+func downloadFromYouTube(req DownloadRequest) (YouTubeDownloadResult, error) {
+	downloader := NewYouTubeDownloader()
+
+	var quality YouTubeQuality
+	switch strings.ToLower(req.Quality) {
+	case "opus_256", "opus256", "opus":
+		quality = YouTubeQualityOpus256
+	case "mp3_320", "mp3320", "mp3":
+		quality = YouTubeQualityMP3320
+	default:
+		quality = YouTubeQualityMP3320 // Default to MP3 320kbps
+	}
+
+	// URL lookup priority: YouTube video ID > Spotify ID > Deezer ID > ISRC
+	var youtubeURL string
+	var lookupErr error
+
+	// SpotifyID might actually be a YouTube video ID (from YT Music extension)
+	if req.SpotifyID != "" && isYouTubeVideoID(req.SpotifyID) {
+		youtubeURL = BuildYouTubeWatchURL(req.SpotifyID)
+		GoLog("[YouTube] SpotifyID appears to be YouTube video ID, using directly: %s\n", youtubeURL)
+	}
+
+	// Try Spotify ID via SongLink
+	if youtubeURL == "" && req.SpotifyID != "" && !isYouTubeVideoID(req.SpotifyID) {
+		GoLog("[YouTube] Looking up YouTube URL via SongLink for Spotify ID: %s\n", req.SpotifyID)
+		songlink := NewSongLinkClient()
+		youtubeURL, lookupErr = songlink.GetYouTubeURLFromSpotify(req.SpotifyID)
+		if lookupErr != nil {
+			GoLog("[YouTube] SongLink Spotify lookup failed: %v\n", lookupErr)
+		} else {
+			GoLog("[YouTube] Found YouTube URL via SongLink (Spotify): %s\n", youtubeURL)
+		}
+	}
+
+	// Try Deezer ID via SongLink
+	if youtubeURL == "" && req.DeezerID != "" {
+		GoLog("[YouTube] Looking up YouTube URL via SongLink for Deezer ID: %s\n", req.DeezerID)
+		songlink := NewSongLinkClient()
+		youtubeURL, lookupErr = songlink.GetYouTubeURLFromDeezer(req.DeezerID)
+		if lookupErr != nil {
+			GoLog("[YouTube] SongLink Deezer lookup failed: %v\n", lookupErr)
+		} else {
+			GoLog("[YouTube] Found YouTube URL via SongLink (Deezer): %s\n", youtubeURL)
+		}
+	}
+
+	// Try ISRC via SongLink
+	if youtubeURL == "" && req.ISRC != "" {
+		GoLog("[YouTube] Looking up YouTube URL via SongLink for ISRC: %s\n", req.ISRC)
+		songlink := NewSongLinkClient()
+		availability, isrcErr := songlink.CheckTrackAvailability("", req.ISRC)
+		if isrcErr == nil && availability.YouTube && availability.YouTubeURL != "" {
+			youtubeURL = availability.YouTubeURL
+			GoLog("[YouTube] Found YouTube URL via SongLink (ISRC): %s\n", youtubeURL)
+		} else if isrcErr != nil {
+			GoLog("[YouTube] SongLink ISRC lookup failed: %v\n", isrcErr)
+		}
+	}
+
+	// Cobalt requires direct video URLs, not search URLs
+	if youtubeURL == "" {
+		return YouTubeDownloadResult{}, fmt.Errorf("could not find YouTube URL for track: %s - %s (no Spotify/Deezer ID available or track not on YouTube)", req.ArtistName, req.TrackName)
+	}
+
+	GoLog("[YouTube] Requesting download from Cobalt for: %s\n", youtubeURL)
+
+	cobaltResp, err := downloader.GetDownloadURL(youtubeURL, quality)
+	if err != nil {
+		return YouTubeDownloadResult{}, fmt.Errorf("failed to get download URL: %w", err)
+	}
+
+	var ext string
+	var format string
+	var bitrate int
+	switch quality {
+	case YouTubeQualityOpus256:
+		ext = ".opus"
+		format = "opus"
+		bitrate = 256
+	case YouTubeQualityMP3320:
+		ext = ".mp3"
+		format = "mp3"
+		bitrate = 320
+	}
+
+	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]any{
+		"title":  req.TrackName,
+		"artist": req.ArtistName,
+		"album":  req.AlbumName,
+		"track":  req.TrackNumber,
+		"year":   extractYear(req.ReleaseDate),
+		"date":   req.ReleaseDate,
+		"disc":   req.DiscNumber,
+	})
+	filename = sanitizeFilename(filename) + ext
+
+	var outputPath string
+	isSafOutput := isFDOutput(req.OutputFD) || strings.TrimSpace(req.OutputPath) != ""
+	if isSafOutput {
+		outputPath = strings.TrimSpace(req.OutputPath)
+		if outputPath == "" && isFDOutput(req.OutputFD) {
+			outputPath = fmt.Sprintf("/proc/self/fd/%d", req.OutputFD)
+		}
+	} else {
+		outputPath = req.OutputDir + "/" + filename
+	}
+
+	GoLog("[YouTube] Downloading to: %s\n", outputPath)
+
+	// Parallel fetch cover art + lyrics
+	var parallelResult *ParallelDownloadResult
+	if req.EmbedLyrics || req.CoverURL != "" {
+		GoLog("[YouTube] Starting parallel fetch for cover and lyrics...\n")
+		parallelResult = FetchCoverAndLyricsParallel(
+			req.CoverURL,
+			req.EmbedMaxQualityCover,
+			req.SpotifyID,
+			req.TrackName,
+			req.ArtistName,
+			req.EmbedLyrics,
+			int64(req.DurationMS),
+		)
+	}
+
+	if err := downloader.DownloadFile(cobaltResp.URL, outputPath, req.OutputFD, req.ItemID); err != nil {
+		return YouTubeDownloadResult{}, fmt.Errorf("download failed: %w", err)
+	}
+
+	lyricsLRC := ""
+	var coverData []byte
+	if parallelResult != nil {
+		if parallelResult.LyricsLRC != "" {
+			lyricsLRC = parallelResult.LyricsLRC
+			GoLog("[YouTube] Got lyrics from lrclib (%d lines)\n", len(parallelResult.LyricsData.Lines))
+		}
+		if parallelResult.CoverData != nil {
+			coverData = parallelResult.CoverData
+			GoLog("[YouTube] Got cover art (%d bytes)\n", len(coverData))
+		}
+	}
+
+	return YouTubeDownloadResult{
+		FilePath:    outputPath,
+		Title:       req.TrackName,
+		Artist:      req.ArtistName,
+		Album:       req.AlbumName,
+		ReleaseDate: req.ReleaseDate,
+		TrackNumber: req.TrackNumber,
+		DiscNumber:  req.DiscNumber,
+		ISRC:        req.ISRC,
+		Format:      format,
+		Bitrate:     bitrate,
+		LyricsLRC:   lyricsLRC,
+		CoverData:   coverData,
+	}, nil
+}
@@ -46,6 +46,11 @@ post_install do |installer|
    flutter_additional_ios_build_settings(target)
    target.build_configurations.each do |config|
      config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '14.0'
+      config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= ['$(inherited)']
+      definitions = config.build_settings['GCC_PREPROCESSOR_DEFINITIONS']
+      unless definitions.include?('PERMISSION_NOTIFICATIONS=1')
+        definitions << 'PERMISSION_NOTIFICATIONS=1'
+      end
    end
  end
 end
@@ -83,18 +83,12 @@ import Gobackend  // Import Go framework
            if let error = error { throw error }
            return response
            
-        case "downloadTrack":
+        case "downloadByStrategy":
            let requestJson = call.arguments as! String
-            let response = GobackendDownloadTrack(requestJson, &error)
+            let response = GobackendDownloadByStrategy(requestJson, &error)
            if let error = error { throw error }
            return response
-            
-        case "downloadWithFallback":
-            let requestJson = call.arguments as! String
-            let response = GobackendDownloadWithFallback(requestJson, &error)
-            if let error = error { throw error }
-            return response
-            
+
        case "getDownloadProgress":
            let response = GobackendGetDownloadProgress()
            return response
@@ -197,6 +191,17 @@ import Gobackend  // Import Go framework
            let response = GobackendGetLyricsLRC(spotifyId, trackName, artistName, filePath, durationMs, &error)
            if let error = error { throw error }
            return response
+
+        case "getLyricsLRCWithSource":
+            let args = call.arguments as! [String: Any]
+            let spotifyId = args["spotify_id"] as! String
+            let trackName = args["track_name"] as! String
+            let artistName = args["artist_name"] as! String
+            let filePath = args["file_path"] as? String ?? ""
+            let durationMs = args["duration_ms"] as? Int64 ?? 0
+            let response = GobackendGetLyricsLRCWithSource(spotifyId, trackName, artistName, filePath, durationMs, &error)
+            if let error = error { throw error }
+            return response
            
        case "embedLyricsToFile":
            let args = call.arguments as! [String: Any]
@@ -209,6 +214,41 @@ import Gobackend  // Import Go framework
        case "cleanupConnections":
            GobackendCleanupConnections()
            return nil
+
+        case "downloadCoverToFile":
+            let args = call.arguments as! [String: Any]
+            let coverURL = args["cover_url"] as! String
+            let outputPath = args["output_path"] as! String
+            let maxQuality = args["max_quality"] as? Bool ?? true
+            GobackendDownloadCoverToFile(coverURL, outputPath, maxQuality, &error)
+            if let error = error { throw error }
+            return "{\"success\":true}"
+
+        case "extractCoverToFile":
+            let args = call.arguments as! [String: Any]
+            let audioPath = args["audio_path"] as! String
+            let outputPath = args["output_path"] as! String
+            GobackendExtractCoverToFile(audioPath, outputPath, &error)
+            if let error = error { throw error }
+            return "{\"success\":true}"
+
+        case "fetchAndSaveLyrics":
+            let args = call.arguments as! [String: Any]
+            let trackName = args["track_name"] as! String
+            let artistName = args["artist_name"] as! String
+            let spotifyId = args["spotify_id"] as! String
+            let durationMs = args["duration_ms"] as? Int64 ?? 0
+            let outputPath = args["output_path"] as! String
+            GobackendFetchAndSaveLyrics(trackName, artistName, spotifyId, durationMs, outputPath, &error)
+            if let error = error { throw error }
+            return "{\"success\":true}"
+
+        case "reEnrichFile":
+            let args = call.arguments as! [String: Any]
+            let requestJson = args["request_json"] as? String ?? "{}"
+            let response = GobackendReEnrichFile(requestJson, &error)
+            if let error = error { throw error }
+            return response
            
        case "readFileMetadata":
            let args = call.arguments as! [String: Any]
@@ -217,6 +257,14 @@ import Gobackend  // Import Go framework
            if let error = error { throw error }
            return response
            
+        case "editFileMetadata":
+            let args = call.arguments as! [String: Any]
+            let filePath = args["file_path"] as! String
+            let metadataJson = args["metadata_json"] as? String ?? "{}"
+            let response = GobackendEditFileMetadata(filePath, metadataJson, &error)
+            if let error = error { throw error }
+            return response
+            
        case "searchDeezerAll":
            let args = call.arguments as! [String: Any]
            let query = args["query"] as! String
@@ -242,6 +290,20 @@ import Gobackend  // Import Go framework
            if let error = error { throw error }
            return response

+        case "parseTidalUrl":
+            let args = call.arguments as! [String: Any]
+            let url = args["url"] as! String
+            let response = GobackendParseTidalURLExport(url, &error)
+            if let error = error { throw error }
+            return response
+
+        case "convertTidalToSpotifyDeezer":
+            let args = call.arguments as! [String: Any]
+            let url = args["url"] as! String
+            let response = GobackendConvertTidalToSpotifyDeezer(url, &error)
+            if let error = error { throw error }
+            return response
+
        case "searchDeezerByISRC":
            let args = call.arguments as! [String: Any]
            let isrc = args["isrc"] as! String
@@ -457,12 +519,6 @@ import Gobackend  // Import Go framework
            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 "enrichTrackWithExtension":
            let args = call.arguments as! [String: Any]
            let extensionId = args["extension_id"] as! String
@@ -470,6 +526,12 @@ import Gobackend  // Import Go framework
            let response = GobackendEnrichTrackWithExtensionJSON(extensionId, trackJson, &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]
@@ -625,6 +687,14 @@ import Gobackend  // Import Go framework
            let response = GobackendRunPostProcessingJSON(filePath, metadataJson, &error)
            if let error = error { throw error }
            return response
+
+        case "runPostProcessingV2":
+            let args = call.arguments as! [String: Any]
+            let inputJson = args["input"] as? String ?? ""
+            let metadataJson = args["metadata"] as? String ?? ""
+            let response = GobackendRunPostProcessingV2JSON(inputJson, metadataJson, &error)
+            if let error = error { throw error }
+            return response
            
        case "getPostProcessingProviders":
            let response = GobackendGetPostProcessingProvidersJSON(&error)
@@ -687,6 +757,73 @@ import Gobackend  // Import Go framework
            if let error = error { throw error }
            return response
            
+        // Local Library Scanning
+        case "setLibraryCoverCacheDir":
+            let args = call.arguments as! [String: Any]
+            let cacheDir = args["cache_dir"] as! String
+            GobackendSetLibraryCoverCacheDirJSON(cacheDir)
+            return nil
+            
+        case "scanLibraryFolder":
+            let args = call.arguments as! [String: Any]
+            let folderPath = args["folder_path"] as! String
+            let response = GobackendScanLibraryFolderJSON(folderPath, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "scanLibraryFolderIncremental":
+            let args = call.arguments as! [String: Any]
+            let folderPath = args["folder_path"] as! String
+            let existingFiles = args["existing_files"] as? String ?? "{}"
+            let response = GobackendScanLibraryFolderIncrementalJSON(folderPath, existingFiles, &error)
+            if let error = error { throw error }
+            return response
+            
+        case "getLibraryScanProgress":
+            let response = GobackendGetLibraryScanProgressJSON()
+            return response
+            
+        case "cancelLibraryScan":
+            GobackendCancelLibraryScanJSON()
+            return nil
+            
+        case "readAudioMetadata":
+            let args = call.arguments as! [String: Any]
+            let filePath = args["file_path"] as! String
+            let response = GobackendReadAudioMetadataJSON(filePath, &error)
+            if let error = error { throw error }
+            return response
+            
+        // Lyrics Provider Settings
+        case "setLyricsProviders":
+            let args = call.arguments as! [String: Any]
+            let providersJson = args["providers_json"] as? String ?? "[]"
+            GobackendSetLyricsProvidersJSON(providersJson, &error)
+            if let error = error { throw error }
+            return "{\"success\":true}"
+            
+        case "getLyricsProviders":
+            let response = GobackendGetLyricsProvidersJSON(&error)
+            if let error = error { throw error }
+            return response
+            
+        case "getAvailableLyricsProviders":
+            let response = GobackendGetAvailableLyricsProvidersJSON(&error)
+            if let error = error { throw error }
+            return response
+            
+        case "setLyricsFetchOptions":
+            let args = call.arguments as! [String: Any]
+            let optionsJson = args["options_json"] as? String ?? "{}"
+            GobackendSetLyricsFetchOptionsJSON(optionsJson, &error)
+            if let error = error { throw error }
+            return "{\"success\":true}"
+            
+        case "getLyricsFetchOptions":
+            let response = GobackendGetLyricsFetchOptionsJSON(&error)
+            if let error = error { throw error }
+            return response
+            
        default:
            throw NSError(
                domain: "SpotiFLAC",
@@ -67,7 +67,7 @@
 	<key>NSAppTransportSecurity</key>
 	<dict>
 		<key>NSAllowsArbitraryLoads</key>
-		<true/>
+		<false/>
 	</dict>
 	
 	<!-- File Sharing - Allow access via Files app -->
@@ -81,5 +81,29 @@
 	<!-- Photo Library (for cover art if needed) -->
 	<key>NSPhotoLibraryUsageDescription</key>
 	<string>SpotiFLAC needs access to save album artwork</string>
+	
+	<!-- URL Schemes for deep linking -->
+	<key>CFBundleURLTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleTypeRole</key>
+			<string>Viewer</string>
+			<key>CFBundleURLName</key>
+			<string>com.zarz.spotiflac</string>
+			<key>CFBundleURLSchemes</key>
+			<array>
+				<string>spotiflac</string>
+			</array>
+		</dict>
+	</array>
+	
+	<!-- Associated Domains for Universal Links -->
+	<key>LSApplicationQueriesSchemes</key>
+	<array>
+		<string>spotify</string>
+		<string>deezer</string>
+		<string>tidal</string>
+		<string>youtube-music</string>
+	</array>
 </dict>
 </plist>
@@ -4,36 +4,55 @@ import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:go_router/go_router.dart';
 import 'package:spotiflac_android/screens/main_shell.dart';
 import 'package:spotiflac_android/screens/setup_screen.dart';
+import 'package:spotiflac_android/screens/tutorial_screen.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
 import 'package:spotiflac_android/theme/dynamic_color_wrapper.dart';
 import 'package:spotiflac_android/l10n/app_localizations.dart';

 final _routerProvider = Provider<GoRouter>((ref) {
-  final isFirstLaunch = ref.watch(settingsProvider.select((s) => s.isFirstLaunch));
-  
+  final isFirstLaunch = ref.watch(
+    settingsProvider.select((s) => s.isFirstLaunch),
+  );
+  final hasCompletedTutorial = ref.watch(
+    settingsProvider.select((s) => s.hasCompletedTutorial),
+  );
+
+  // Determine initial location based on app state
+  String initialLocation;
+  if (isFirstLaunch) {
+    initialLocation = '/setup';
+  } else if (!hasCompletedTutorial) {
+    initialLocation = '/tutorial';
+  } else {
+    initialLocation = '/';
+  }
+
  return GoRouter(
-    initialLocation: isFirstLaunch ? '/setup' : '/',
+    initialLocation: initialLocation,
    routes: [
+      GoRoute(path: '/', builder: (context, state) => const MainShell()),
+      GoRoute(path: '/setup', builder: (context, state) => const SetupScreen()),
      GoRoute(
-        path: '/',
-        builder: (context, state) => const MainShell(),
-      ),
-      GoRoute(
-        path: '/setup',
-        builder: (context, state) => const SetupScreen(),
+        path: '/tutorial',
+        builder: (context, state) => const TutorialScreen(),
      ),
    ],
  );
 });

 class SpotiFLACApp extends ConsumerWidget {
-  const SpotiFLACApp({super.key});
+  final bool disableOverscrollEffects;
+
+  const SpotiFLACApp({super.key, this.disableOverscrollEffects = false});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final router = ref.watch(_routerProvider);
    final localeString = ref.watch(settingsProvider.select((s) => s.locale));
-    
+    final scrollBehavior = disableOverscrollEffects
+        ? const MaterialScrollBehavior().copyWith(overscroll: false)
+        : null;
+
    Locale? locale;
    if (localeString != 'system') {
      if (localeString.contains('_')) {
@@ -43,7 +62,7 @@ class SpotiFLACApp extends ConsumerWidget {
        locale = Locale(localeString);
      }
    }
-    
+
    return DynamicColorWrapper(
      builder: (lightTheme, darkTheme, themeMode) {
        return MaterialApp.router(
@@ -52,6 +71,7 @@ class SpotiFLACApp extends ConsumerWidget {
          theme: lightTheme,
          darkTheme: darkTheme,
          themeMode: themeMode,
+          scrollBehavior: scrollBehavior,
          themeAnimationDuration: const Duration(milliseconds: 300),
          themeAnimationCurve: Curves.easeInOut,
          routerConfig: router,
@@ -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 = '3.3.5';
-  static const String buildNumber = '70';
+  static const String version = '3.6.7';
+  static const String buildNumber = '81';
  static const String fullVersion = '$version+$buildNumber';
  
  
@@ -17,4 +17,5 @@ static const String version = '3.3.5';
  static const String originalGithubUrl = 'https://github.com/afkarxyz/SpotiFLAC';
  
  static const String kofiUrl = 'https://ko-fi.com/zarzet';
+  static const String githubSponsorsUrl = 'https://github.com/sponsors/zarzet/';
 }
@@ -18,6 +18,9 @@ class AppLocalizationsEn extends AppLocalizations {
  @override
  String get navHome => 'Home';

+  @override
+  String get navLibrary => 'Library';
+
  @override
  String get navHistory => 'History';

@@ -340,6 +343,10 @@ class AppLocalizationsEn extends AppLocalizations {
  String get optionsSpotifyWarning =>
      'Spotify requires your own API credentials. Get them free from developer.spotify.com';

+  @override
+  String get optionsSpotifyDeprecationWarning =>
+      'Spotify search will be deprecated on March 3, 2026 due to Spotify API changes. Please switch to Deezer.';
+
  @override
  String get extensionsTitle => 'Extensions';

@@ -450,12 +457,6 @@ class AppLocalizationsEn extends AppLocalizations {
  @override
  String get aboutSupport => 'Support';

-  @override
-  String get aboutBuyMeCoffee => 'Buy me a coffee';
-
-  @override
-  String get aboutBuyMeCoffeeSubtitle => 'Support development on Ko-fi';
-
  @override
  String get aboutApp => 'App';

@@ -488,6 +489,13 @@ class AppLocalizationsEn extends AppLocalizations {
  String get aboutDabMusicDesc =>
      'The best Qobuz streaming API. Hi-Res downloads wouldn\'t be possible without this!';

+  @override
+  String get aboutSpotiSaver => 'SpotiSaver';
+
+  @override
+  String get aboutSpotiSaverDesc =>
+      'Tidal Hi-Res FLAC streaming endpoints. A key piece of the lossless puzzle!';
+
  @override
  String get aboutAppDescription =>
      'Download Spotify tracks in lossless quality from Tidal, Qobuz, and Amazon Music.';
@@ -943,6 +951,11 @@ class AppLocalizationsEn extends AppLocalizations {
    return '\"$trackName\" already downloaded';
  }

+  @override
+  String snackbarAlreadyInLibrary(String trackName) {
+    return '\"$trackName\" already exists in your library';
+  }
+
  @override
  String get snackbarHistoryCleared => 'History cleared';

@@ -1169,6 +1182,13 @@ class AppLocalizationsEn extends AppLocalizations {
    return '$artist - $title';
  }

+  @override
+  String get filenameShowAdvancedTags => 'Show advanced tags';
+
+  @override
+  String get filenameShowAdvancedTagsDescription =>
+      'Enable formatted tags for track padding and date patterns';
+
  @override
  String get folderOrganization => 'Folder Organization';

@@ -1899,6 +1919,10 @@ class AppLocalizationsEn extends AppLocalizations {
  String get qualityNote =>
      'Actual quality depends on track availability from the service';

+  @override
+  String get youtubeQualityNote =>
+      'YouTube provides lossy audio only. Not part of lossless fallback.';
+
  @override
  String get downloadAskBeforeDownload => 'Ask Before Download';

@@ -1911,6 +1935,28 @@ class AppLocalizationsEn extends AppLocalizations {
  @override
  String get downloadAlbumFolderStructure => 'Album Folder Structure';

+  @override
+  String get downloadUseAlbumArtistForFolders => 'Use Album Artist for folders';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersAlbumSubtitle =>
+      'Artist folders use Album Artist when available';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersTrackSubtitle =>
+      'Artist folders use Track Artist only';
+
+  @override
+  String get downloadUsePrimaryArtistOnly => 'Primary artist only for folders';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyEnabled =>
+      'Featured artists removed from folder name (e.g. Justin Bieber, Quavo → Justin Bieber)';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyDisabled =>
+      'Full artist string used for folder name';
+
  @override
  String get downloadSaveFormat => 'Save Format';

@@ -2010,6 +2056,19 @@ class AppLocalizationsEn extends AppLocalizations {
  String get settingsAutoExportFailedSubtitle =>
      'Save failed downloads to TXT file automatically';

+  @override
+  String get settingsDownloadNetwork => 'Download Network';
+
+  @override
+  String get settingsDownloadNetworkAny => 'WiFi + Mobile Data';
+
+  @override
+  String get settingsDownloadNetworkWifiOnly => 'WiFi Only';
+
+  @override
+  String get settingsDownloadNetworkSubtitle =>
+      'Choose which network to use for downloads. When set to WiFi Only, downloads will pause on mobile data.';
+
  @override
  String get queueEmpty => 'No downloads in queue';

@@ -2133,6 +2192,12 @@ class AppLocalizationsEn extends AppLocalizations {
  @override
  String get recentTypePlaylist => 'Playlist';

+  @override
+  String get recentEmpty => 'No recent items yet';
+
+  @override
+  String get recentShowAllDownloads => 'Show All Downloads';
+
  @override
  String recentPlaylistInfo(String name) {
    return 'Playlist: $name';
@@ -2232,4 +2297,649 @@ class AppLocalizationsEn extends AppLocalizations {
  @override
  String get allFilesAccessDisabledMessage =>
      'All Files Access disabled. The app will use limited storage access.';
+
+  @override
+  String get settingsLocalLibrary => 'Local Library';
+
+  @override
+  String get settingsLocalLibrarySubtitle => 'Scan music & detect duplicates';
+
+  @override
+  String get settingsCache => 'Storage & Cache';
+
+  @override
+  String get settingsCacheSubtitle => 'View size and clear cached data';
+
+  @override
+  String get libraryTitle => 'Local Library';
+
+  @override
+  String get libraryStatus => 'Library Status';
+
+  @override
+  String get libraryScanSettings => 'Scan Settings';
+
+  @override
+  String get libraryEnableLocalLibrary => 'Enable Local Library';
+
+  @override
+  String get libraryEnableLocalLibrarySubtitle =>
+      'Scan and track your existing music';
+
+  @override
+  String get libraryFolder => 'Library Folder';
+
+  @override
+  String get libraryFolderHint => 'Tap to select folder';
+
+  @override
+  String get libraryShowDuplicateIndicator => 'Show Duplicate Indicator';
+
+  @override
+  String get libraryShowDuplicateIndicatorSubtitle =>
+      'Show when searching for existing tracks';
+
+  @override
+  String get libraryActions => 'Actions';
+
+  @override
+  String get libraryScan => 'Scan Library';
+
+  @override
+  String get libraryScanSubtitle => 'Scan for audio files';
+
+  @override
+  String get libraryScanSelectFolderFirst => 'Select a folder first';
+
+  @override
+  String get libraryCleanupMissingFiles => 'Cleanup Missing Files';
+
+  @override
+  String get libraryCleanupMissingFilesSubtitle =>
+      'Remove entries for files that no longer exist';
+
+  @override
+  String get libraryClear => 'Clear Library';
+
+  @override
+  String get libraryClearSubtitle => 'Remove all scanned tracks';
+
+  @override
+  String get libraryClearConfirmTitle => 'Clear Library';
+
+  @override
+  String get libraryClearConfirmMessage =>
+      'This will remove all scanned tracks from your library. Your actual music files will not be deleted.';
+
+  @override
+  String get libraryAbout => 'About Local Library';
+
+  @override
+  String get libraryAboutDescription =>
+      'Scans your existing music collection to detect duplicates when downloading. Supports FLAC, M4A, MP3, Opus, and OGG formats. Metadata is read from file tags when available.';
+
+  @override
+  String libraryTracksCount(int count) {
+    return '$count tracks';
+  }
+
+  @override
+  String libraryLastScanned(String time) {
+    return 'Last scanned: $time';
+  }
+
+  @override
+  String get libraryLastScannedNever => 'Never';
+
+  @override
+  String get libraryScanning => 'Scanning...';
+
+  @override
+  String libraryScanProgress(String progress, int total) {
+    return '$progress% of $total files';
+  }
+
+  @override
+  String get libraryInLibrary => 'In Library';
+
+  @override
+  String libraryRemovedMissingFiles(int count) {
+    return 'Removed $count missing files from library';
+  }
+
+  @override
+  String get libraryCleared => 'Library cleared';
+
+  @override
+  String get libraryStorageAccessRequired => 'Storage Access Required';
+
+  @override
+  String get libraryStorageAccessMessage =>
+      'SpotiFLAC needs storage access to scan your music library. Please grant permission in settings.';
+
+  @override
+  String get libraryFolderNotExist => 'Selected folder does not exist';
+
+  @override
+  String get librarySourceDownloaded => 'Downloaded';
+
+  @override
+  String get librarySourceLocal => 'Local';
+
+  @override
+  String get libraryFilterAll => 'All';
+
+  @override
+  String get libraryFilterDownloaded => 'Downloaded';
+
+  @override
+  String get libraryFilterLocal => 'Local';
+
+  @override
+  String get libraryFilterTitle => 'Filters';
+
+  @override
+  String get libraryFilterReset => 'Reset';
+
+  @override
+  String get libraryFilterApply => 'Apply';
+
+  @override
+  String get libraryFilterSource => 'Source';
+
+  @override
+  String get libraryFilterQuality => 'Quality';
+
+  @override
+  String get libraryFilterQualityHiRes => 'Hi-Res (24bit)';
+
+  @override
+  String get libraryFilterQualityCD => 'CD (16bit)';
+
+  @override
+  String get libraryFilterQualityLossy => 'Lossy';
+
+  @override
+  String get libraryFilterFormat => 'Format';
+
+  @override
+  String get libraryFilterDate => 'Date Added';
+
+  @override
+  String get libraryFilterDateToday => 'Today';
+
+  @override
+  String get libraryFilterDateWeek => 'This Week';
+
+  @override
+  String get libraryFilterDateMonth => 'This Month';
+
+  @override
+  String get libraryFilterDateYear => 'This Year';
+
+  @override
+  String get libraryFilterSort => 'Sort';
+
+  @override
+  String get libraryFilterSortLatest => 'Latest';
+
+  @override
+  String get libraryFilterSortOldest => 'Oldest';
+
+  @override
+  String libraryFilterActive(int count) {
+    return '$count filter(s) active';
+  }
+
+  @override
+  String get timeJustNow => 'Just now';
+
+  @override
+  String timeMinutesAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count minutes ago',
+      one: '1 minute ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String timeHoursAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count hours ago',
+      one: '1 hour ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String get storageSwitchTitle => 'Switch Storage Mode';
+
+  @override
+  String get storageSwitchToSafTitle => 'Switch to SAF Storage?';
+
+  @override
+  String get storageSwitchToAppTitle => 'Switch to App Storage?';
+
+  @override
+  String get storageSwitchToSafMessage =>
+      'Your existing downloads will remain in the current location and stay accessible.\n\nNew downloads will be saved to your selected SAF folder.';
+
+  @override
+  String get storageSwitchToAppMessage =>
+      'Your existing downloads will remain in the current SAF location and stay accessible.\n\nNew downloads will be saved to Music/SpotiFLAC folder.';
+
+  @override
+  String get storageSwitchExistingDownloads => 'Existing Downloads';
+
+  @override
+  String storageSwitchExistingDownloadsInfo(int count, String mode) {
+    return '$count tracks in $mode storage';
+  }
+
+  @override
+  String get storageSwitchNewDownloads => 'New Downloads';
+
+  @override
+  String storageSwitchNewDownloadsLocation(String location) {
+    return 'Will be saved to: $location';
+  }
+
+  @override
+  String get storageSwitchContinue => 'Continue';
+
+  @override
+  String get storageSwitchSelectFolder => 'Select SAF Folder';
+
+  @override
+  String get storageAppStorage => 'App Storage';
+
+  @override
+  String get storageSafStorage => 'SAF Storage';
+
+  @override
+  String storageModeBadge(String mode) {
+    return 'Storage: $mode';
+  }
+
+  @override
+  String get storageStatsTitle => 'Storage Statistics';
+
+  @override
+  String storageStatsAppCount(int count) {
+    return '$count tracks in App Storage';
+  }
+
+  @override
+  String storageStatsSafCount(int count) {
+    return '$count tracks in SAF Storage';
+  }
+
+  @override
+  String get storageModeInfo => 'Your files are stored in multiple locations';
+
+  @override
+  String get tutorialWelcomeTitle => 'Welcome to SpotiFLAC!';
+
+  @override
+  String get tutorialWelcomeDesc =>
+      'Let\'s learn how to download your favorite music in lossless quality. This quick tutorial will show you the basics.';
+
+  @override
+  String get tutorialWelcomeTip1 =>
+      'Download music from Spotify, Deezer, or paste any supported URL';
+
+  @override
+  String get tutorialWelcomeTip2 =>
+      'Get FLAC quality audio from Tidal, Qobuz, or Amazon Music';
+
+  @override
+  String get tutorialWelcomeTip3 =>
+      'Automatic metadata, cover art, and lyrics embedding';
+
+  @override
+  String get tutorialSearchTitle => 'Finding Music';
+
+  @override
+  String get tutorialSearchDesc =>
+      'There are two easy ways to find music you want to download.';
+
+  @override
+  String get tutorialSearchTip1 =>
+      'Paste a Spotify or Deezer URL directly in the search box';
+
+  @override
+  String get tutorialSearchTip2 =>
+      'Or type the song name, artist, or album to search';
+
+  @override
+  String get tutorialSearchTip3 =>
+      'Supports tracks, albums, playlists, and artist pages';
+
+  @override
+  String get tutorialDownloadTitle => 'Downloading Music';
+
+  @override
+  String get tutorialDownloadDesc =>
+      'Downloading music is simple and fast. Here\'s how it works.';
+
+  @override
+  String get tutorialDownloadTip1 =>
+      'Tap the download button next to any track to start downloading';
+
+  @override
+  String get tutorialDownloadTip2 =>
+      'Choose your preferred quality (FLAC, Hi-Res, or MP3)';
+
+  @override
+  String get tutorialDownloadTip3 =>
+      'Download entire albums or playlists with one tap';
+
+  @override
+  String get tutorialLibraryTitle => 'Your Library';
+
+  @override
+  String get tutorialLibraryDesc =>
+      'All your downloaded music is organized in the Library tab.';
+
+  @override
+  String get tutorialLibraryTip1 =>
+      'View download progress and queue in the Library tab';
+
+  @override
+  String get tutorialLibraryTip2 =>
+      'Tap any track to play it with your music player';
+
+  @override
+  String get tutorialLibraryTip3 =>
+      'Switch between list and grid view for better browsing';
+
+  @override
+  String get tutorialExtensionsTitle => 'Extensions';
+
+  @override
+  String get tutorialExtensionsDesc =>
+      'Extend the app\'s capabilities with community extensions.';
+
+  @override
+  String get tutorialExtensionsTip1 =>
+      'Browse the Store tab to discover useful extensions';
+
+  @override
+  String get tutorialExtensionsTip2 =>
+      'Add new download providers or search sources';
+
+  @override
+  String get tutorialExtensionsTip3 =>
+      'Get lyrics, enhanced metadata, and more features';
+
+  @override
+  String get tutorialSettingsTitle => 'Customize Your Experience';
+
+  @override
+  String get tutorialSettingsDesc =>
+      'Personalize the app in Settings to match your preferences.';
+
+  @override
+  String get tutorialSettingsTip1 =>
+      'Change download location and folder organization';
+
+  @override
+  String get tutorialSettingsTip2 =>
+      'Set default audio quality and format preferences';
+
+  @override
+  String get tutorialSettingsTip3 => 'Customize app theme and appearance';
+
+  @override
+  String get tutorialReadyMessage =>
+      'You\'re all set! Start downloading your favorite music now.';
+
+  @override
+  String get tutorialExample => 'EXAMPLE';
+
+  @override
+  String get libraryForceFullScan => 'Force Full Scan';
+
+  @override
+  String get libraryForceFullScanSubtitle => 'Rescan all files, ignoring cache';
+
+  @override
+  String get cleanupOrphanedDownloads => 'Cleanup Orphaned Downloads';
+
+  @override
+  String get cleanupOrphanedDownloadsSubtitle =>
+      'Remove history entries for files that no longer exist';
+
+  @override
+  String cleanupOrphanedDownloadsResult(int count) {
+    return 'Removed $count orphaned entries from history';
+  }
+
+  @override
+  String get cleanupOrphanedDownloadsNone => 'No orphaned entries found';
+
+  @override
+  String get cacheTitle => 'Storage & Cache';
+
+  @override
+  String get cacheSummaryTitle => 'Cache overview';
+
+  @override
+  String get cacheSummarySubtitle =>
+      'Clearing cache will not remove downloaded music files.';
+
+  @override
+  String cacheEstimatedTotal(String size) {
+    return 'Estimated cache usage: $size';
+  }
+
+  @override
+  String get cacheSectionStorage => 'Cached Data';
+
+  @override
+  String get cacheSectionMaintenance => 'Maintenance';
+
+  @override
+  String get cacheAppDirectory => 'App cache directory';
+
+  @override
+  String get cacheAppDirectoryDesc =>
+      'HTTP responses, WebView data, and other temporary app data.';
+
+  @override
+  String get cacheTempDirectory => 'Temporary directory';
+
+  @override
+  String get cacheTempDirectoryDesc =>
+      'Temporary files from downloads and audio conversion.';
+
+  @override
+  String get cacheCoverImage => 'Cover image cache';
+
+  @override
+  String get cacheCoverImageDesc =>
+      'Downloaded album and track cover art. Will re-download when viewed.';
+
+  @override
+  String get cacheLibraryCover => 'Library cover cache';
+
+  @override
+  String get cacheLibraryCoverDesc =>
+      'Cover art extracted from local music files. Will re-extract on next scan.';
+
+  @override
+  String get cacheExploreFeed => 'Explore feed cache';
+
+  @override
+  String get cacheExploreFeedDesc =>
+      'Explore tab content (new releases, trending). Will refresh on next visit.';
+
+  @override
+  String get cacheTrackLookup => 'Track lookup cache';
+
+  @override
+  String get cacheTrackLookupDesc =>
+      'Spotify/Deezer track ID lookups. Clearing may slow next few searches.';
+
+  @override
+  String get cacheCleanupUnusedDesc =>
+      'Remove orphaned download history and library entries for missing files.';
+
+  @override
+  String get cacheNoData => 'No cached data';
+
+  @override
+  String cacheSizeWithFiles(String size, int count) {
+    return '$size in $count files';
+  }
+
+  @override
+  String cacheSizeOnly(String size) {
+    return '$size';
+  }
+
+  @override
+  String cacheEntries(int count) {
+    return '$count entries';
+  }
+
+  @override
+  String cacheClearSuccess(String target) {
+    return 'Cleared: $target';
+  }
+
+  @override
+  String get cacheClearConfirmTitle => 'Clear cache?';
+
+  @override
+  String cacheClearConfirmMessage(String target) {
+    return 'This will clear cached data for $target. Downloaded music files will not be deleted.';
+  }
+
+  @override
+  String get cacheClearAllConfirmTitle => 'Clear all cache?';
+
+  @override
+  String get cacheClearAllConfirmMessage =>
+      'This will clear all cache categories on this page. Downloaded music files will not be deleted.';
+
+  @override
+  String get cacheClearAll => 'Clear all cache';
+
+  @override
+  String get cacheCleanupUnused => 'Cleanup unused data';
+
+  @override
+  String get cacheCleanupUnusedSubtitle =>
+      'Remove orphaned download history and missing library entries';
+
+  @override
+  String cacheCleanupResult(int downloadCount, int libraryCount) {
+    return 'Cleanup completed: $downloadCount orphaned downloads, $libraryCount missing library entries';
+  }
+
+  @override
+  String get cacheRefreshStats => 'Refresh stats';
+
+  @override
+  String get trackSaveCoverArt => 'Save Cover Art';
+
+  @override
+  String get trackSaveCoverArtSubtitle => 'Save album art as .jpg file';
+
+  @override
+  String get trackSaveLyrics => 'Save Lyrics (.lrc)';
+
+  @override
+  String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
+
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
+  @override
+  String get trackReEnrich => 'Re-enrich Metadata';
+
+  @override
+  String get trackReEnrichSubtitle =>
+      'Re-embed metadata without re-downloading';
+
+  @override
+  String get trackReEnrichOnlineSubtitle =>
+      'Search metadata online and embed into file';
+
+  @override
+  String get trackEditMetadata => 'Edit Metadata';
+
+  @override
+  String trackCoverSaved(String fileName) {
+    return 'Cover art saved to $fileName';
+  }
+
+  @override
+  String get trackCoverNoSource => 'No cover art source available';
+
+  @override
+  String trackLyricsSaved(String fileName) {
+    return 'Lyrics saved to $fileName';
+  }
+
+  @override
+  String get trackReEnrichProgress => 'Re-enriching metadata...';
+
+  @override
+  String get trackReEnrichSearching => 'Searching metadata online...';
+
+  @override
+  String get trackReEnrichSuccess => 'Metadata re-enriched successfully';
+
+  @override
+  String get trackReEnrichFfmpegFailed => 'FFmpeg metadata embed failed';
+
+  @override
+  String trackSaveFailed(String error) {
+    return 'Failed: $error';
+  }
+
+  @override
+  String get trackConvertFormat => 'Convert Format';
+
+  @override
+  String get trackConvertFormatSubtitle => 'Convert to MP3 or Opus';
+
+  @override
+  String get trackConvertTitle => 'Convert Audio';
+
+  @override
+  String get trackConvertTargetFormat => 'Target Format';
+
+  @override
+  String get trackConvertBitrate => 'Bitrate';
+
+  @override
+  String get trackConvertConfirmTitle => 'Confirm Conversion';
+
+  @override
+  String trackConvertConfirmMessage(
+    String sourceFormat,
+    String targetFormat,
+    String bitrate,
+  ) {
+    return 'Convert from $sourceFormat to $targetFormat at $bitrate?\n\nThe original file will be deleted after conversion.';
+  }
+
+  @override
+  String get trackConvertConverting => 'Converting audio...';
+
+  @override
+  String trackConvertSuccess(String format) {
+    return 'Converted to $format successfully';
+  }
+
+  @override
+  String get trackConvertFailed => 'Conversion failed';
 }
@@ -18,6 +18,9 @@ class AppLocalizationsHi extends AppLocalizations {
  @override
  String get navHome => 'होम';

+  @override
+  String get navLibrary => 'Library';
+
  @override
  String get navHistory => 'इतिहास';

@@ -340,6 +343,10 @@ class AppLocalizationsHi extends AppLocalizations {
  String get optionsSpotifyWarning =>
      'Spotify requires your own API credentials. Get them free from developer.spotify.com';

+  @override
+  String get optionsSpotifyDeprecationWarning =>
+      'Spotify search will be deprecated on March 3, 2026 due to Spotify API changes. Please switch to Deezer.';
+
  @override
  String get extensionsTitle => 'Extensions';

@@ -450,12 +457,6 @@ class AppLocalizationsHi extends AppLocalizations {
  @override
  String get aboutSupport => 'Support';

-  @override
-  String get aboutBuyMeCoffee => 'Buy me a coffee';
-
-  @override
-  String get aboutBuyMeCoffeeSubtitle => 'Support development on Ko-fi';
-
  @override
  String get aboutApp => 'App';

@@ -488,6 +489,13 @@ class AppLocalizationsHi extends AppLocalizations {
  String get aboutDabMusicDesc =>
      'The best Qobuz streaming API. Hi-Res downloads wouldn\'t be possible without this!';

+  @override
+  String get aboutSpotiSaver => 'SpotiSaver';
+
+  @override
+  String get aboutSpotiSaverDesc =>
+      'Tidal Hi-Res FLAC streaming endpoints. A key piece of the lossless puzzle!';
+
  @override
  String get aboutAppDescription =>
      'Download Spotify tracks in lossless quality from Tidal, Qobuz, and Amazon Music.';
@@ -943,6 +951,11 @@ class AppLocalizationsHi extends AppLocalizations {
    return '\"$trackName\" already downloaded';
  }

+  @override
+  String snackbarAlreadyInLibrary(String trackName) {
+    return '\"$trackName\" already exists in your library';
+  }
+
  @override
  String get snackbarHistoryCleared => 'History cleared';

@@ -1169,6 +1182,13 @@ class AppLocalizationsHi extends AppLocalizations {
    return '$artist - $title';
  }

+  @override
+  String get filenameShowAdvancedTags => 'Show advanced tags';
+
+  @override
+  String get filenameShowAdvancedTagsDescription =>
+      'Enable formatted tags for track padding and date patterns';
+
  @override
  String get folderOrganization => 'Folder Organization';

@@ -1899,6 +1919,10 @@ class AppLocalizationsHi extends AppLocalizations {
  String get qualityNote =>
      'Actual quality depends on track availability from the service';

+  @override
+  String get youtubeQualityNote =>
+      'YouTube provides lossy audio only. Not part of lossless fallback.';
+
  @override
  String get downloadAskBeforeDownload => 'Ask Before Download';

@@ -1911,6 +1935,28 @@ class AppLocalizationsHi extends AppLocalizations {
  @override
  String get downloadAlbumFolderStructure => 'Album Folder Structure';

+  @override
+  String get downloadUseAlbumArtistForFolders => 'Use Album Artist for folders';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersAlbumSubtitle =>
+      'Artist folders use Album Artist when available';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersTrackSubtitle =>
+      'Artist folders use Track Artist only';
+
+  @override
+  String get downloadUsePrimaryArtistOnly => 'Primary artist only for folders';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyEnabled =>
+      'Featured artists removed from folder name (e.g. Justin Bieber, Quavo → Justin Bieber)';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyDisabled =>
+      'Full artist string used for folder name';
+
  @override
  String get downloadSaveFormat => 'Save Format';

@@ -2010,6 +2056,19 @@ class AppLocalizationsHi extends AppLocalizations {
  String get settingsAutoExportFailedSubtitle =>
      'Save failed downloads to TXT file automatically';

+  @override
+  String get settingsDownloadNetwork => 'Download Network';
+
+  @override
+  String get settingsDownloadNetworkAny => 'WiFi + Mobile Data';
+
+  @override
+  String get settingsDownloadNetworkWifiOnly => 'WiFi Only';
+
+  @override
+  String get settingsDownloadNetworkSubtitle =>
+      'Choose which network to use for downloads. When set to WiFi Only, downloads will pause on mobile data.';
+
  @override
  String get queueEmpty => 'No downloads in queue';

@@ -2133,6 +2192,12 @@ class AppLocalizationsHi extends AppLocalizations {
  @override
  String get recentTypePlaylist => 'Playlist';

+  @override
+  String get recentEmpty => 'No recent items yet';
+
+  @override
+  String get recentShowAllDownloads => 'Show All Downloads';
+
  @override
  String recentPlaylistInfo(String name) {
    return 'Playlist: $name';
@@ -2232,4 +2297,649 @@ class AppLocalizationsHi extends AppLocalizations {
  @override
  String get allFilesAccessDisabledMessage =>
      'All Files Access disabled. The app will use limited storage access.';
+
+  @override
+  String get settingsLocalLibrary => 'Local Library';
+
+  @override
+  String get settingsLocalLibrarySubtitle => 'Scan music & detect duplicates';
+
+  @override
+  String get settingsCache => 'Storage & Cache';
+
+  @override
+  String get settingsCacheSubtitle => 'View size and clear cached data';
+
+  @override
+  String get libraryTitle => 'Local Library';
+
+  @override
+  String get libraryStatus => 'Library Status';
+
+  @override
+  String get libraryScanSettings => 'Scan Settings';
+
+  @override
+  String get libraryEnableLocalLibrary => 'Enable Local Library';
+
+  @override
+  String get libraryEnableLocalLibrarySubtitle =>
+      'Scan and track your existing music';
+
+  @override
+  String get libraryFolder => 'Library Folder';
+
+  @override
+  String get libraryFolderHint => 'Tap to select folder';
+
+  @override
+  String get libraryShowDuplicateIndicator => 'Show Duplicate Indicator';
+
+  @override
+  String get libraryShowDuplicateIndicatorSubtitle =>
+      'Show when searching for existing tracks';
+
+  @override
+  String get libraryActions => 'Actions';
+
+  @override
+  String get libraryScan => 'Scan Library';
+
+  @override
+  String get libraryScanSubtitle => 'Scan for audio files';
+
+  @override
+  String get libraryScanSelectFolderFirst => 'Select a folder first';
+
+  @override
+  String get libraryCleanupMissingFiles => 'Cleanup Missing Files';
+
+  @override
+  String get libraryCleanupMissingFilesSubtitle =>
+      'Remove entries for files that no longer exist';
+
+  @override
+  String get libraryClear => 'Clear Library';
+
+  @override
+  String get libraryClearSubtitle => 'Remove all scanned tracks';
+
+  @override
+  String get libraryClearConfirmTitle => 'Clear Library';
+
+  @override
+  String get libraryClearConfirmMessage =>
+      'This will remove all scanned tracks from your library. Your actual music files will not be deleted.';
+
+  @override
+  String get libraryAbout => 'About Local Library';
+
+  @override
+  String get libraryAboutDescription =>
+      'Scans your existing music collection to detect duplicates when downloading. Supports FLAC, M4A, MP3, Opus, and OGG formats. Metadata is read from file tags when available.';
+
+  @override
+  String libraryTracksCount(int count) {
+    return '$count tracks';
+  }
+
+  @override
+  String libraryLastScanned(String time) {
+    return 'Last scanned: $time';
+  }
+
+  @override
+  String get libraryLastScannedNever => 'Never';
+
+  @override
+  String get libraryScanning => 'Scanning...';
+
+  @override
+  String libraryScanProgress(String progress, int total) {
+    return '$progress% of $total files';
+  }
+
+  @override
+  String get libraryInLibrary => 'In Library';
+
+  @override
+  String libraryRemovedMissingFiles(int count) {
+    return 'Removed $count missing files from library';
+  }
+
+  @override
+  String get libraryCleared => 'Library cleared';
+
+  @override
+  String get libraryStorageAccessRequired => 'Storage Access Required';
+
+  @override
+  String get libraryStorageAccessMessage =>
+      'SpotiFLAC needs storage access to scan your music library. Please grant permission in settings.';
+
+  @override
+  String get libraryFolderNotExist => 'Selected folder does not exist';
+
+  @override
+  String get librarySourceDownloaded => 'Downloaded';
+
+  @override
+  String get librarySourceLocal => 'Local';
+
+  @override
+  String get libraryFilterAll => 'All';
+
+  @override
+  String get libraryFilterDownloaded => 'Downloaded';
+
+  @override
+  String get libraryFilterLocal => 'Local';
+
+  @override
+  String get libraryFilterTitle => 'Filters';
+
+  @override
+  String get libraryFilterReset => 'Reset';
+
+  @override
+  String get libraryFilterApply => 'Apply';
+
+  @override
+  String get libraryFilterSource => 'Source';
+
+  @override
+  String get libraryFilterQuality => 'Quality';
+
+  @override
+  String get libraryFilterQualityHiRes => 'Hi-Res (24bit)';
+
+  @override
+  String get libraryFilterQualityCD => 'CD (16bit)';
+
+  @override
+  String get libraryFilterQualityLossy => 'Lossy';
+
+  @override
+  String get libraryFilterFormat => 'Format';
+
+  @override
+  String get libraryFilterDate => 'Date Added';
+
+  @override
+  String get libraryFilterDateToday => 'Today';
+
+  @override
+  String get libraryFilterDateWeek => 'This Week';
+
+  @override
+  String get libraryFilterDateMonth => 'This Month';
+
+  @override
+  String get libraryFilterDateYear => 'This Year';
+
+  @override
+  String get libraryFilterSort => 'Sort';
+
+  @override
+  String get libraryFilterSortLatest => 'Latest';
+
+  @override
+  String get libraryFilterSortOldest => 'Oldest';
+
+  @override
+  String libraryFilterActive(int count) {
+    return '$count filter(s) active';
+  }
+
+  @override
+  String get timeJustNow => 'Just now';
+
+  @override
+  String timeMinutesAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count minutes ago',
+      one: '1 minute ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String timeHoursAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count hours ago',
+      one: '1 hour ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String get storageSwitchTitle => 'Switch Storage Mode';
+
+  @override
+  String get storageSwitchToSafTitle => 'Switch to SAF Storage?';
+
+  @override
+  String get storageSwitchToAppTitle => 'Switch to App Storage?';
+
+  @override
+  String get storageSwitchToSafMessage =>
+      'Your existing downloads will remain in the current location and stay accessible.\n\nNew downloads will be saved to your selected SAF folder.';
+
+  @override
+  String get storageSwitchToAppMessage =>
+      'Your existing downloads will remain in the current SAF location and stay accessible.\n\nNew downloads will be saved to Music/SpotiFLAC folder.';
+
+  @override
+  String get storageSwitchExistingDownloads => 'Existing Downloads';
+
+  @override
+  String storageSwitchExistingDownloadsInfo(int count, String mode) {
+    return '$count tracks in $mode storage';
+  }
+
+  @override
+  String get storageSwitchNewDownloads => 'New Downloads';
+
+  @override
+  String storageSwitchNewDownloadsLocation(String location) {
+    return 'Will be saved to: $location';
+  }
+
+  @override
+  String get storageSwitchContinue => 'Continue';
+
+  @override
+  String get storageSwitchSelectFolder => 'Select SAF Folder';
+
+  @override
+  String get storageAppStorage => 'App Storage';
+
+  @override
+  String get storageSafStorage => 'SAF Storage';
+
+  @override
+  String storageModeBadge(String mode) {
+    return 'Storage: $mode';
+  }
+
+  @override
+  String get storageStatsTitle => 'Storage Statistics';
+
+  @override
+  String storageStatsAppCount(int count) {
+    return '$count tracks in App Storage';
+  }
+
+  @override
+  String storageStatsSafCount(int count) {
+    return '$count tracks in SAF Storage';
+  }
+
+  @override
+  String get storageModeInfo => 'Your files are stored in multiple locations';
+
+  @override
+  String get tutorialWelcomeTitle => 'Welcome to SpotiFLAC!';
+
+  @override
+  String get tutorialWelcomeDesc =>
+      'Let\'s learn how to download your favorite music in lossless quality. This quick tutorial will show you the basics.';
+
+  @override
+  String get tutorialWelcomeTip1 =>
+      'Download music from Spotify, Deezer, or paste any supported URL';
+
+  @override
+  String get tutorialWelcomeTip2 =>
+      'Get FLAC quality audio from Tidal, Qobuz, or Amazon Music';
+
+  @override
+  String get tutorialWelcomeTip3 =>
+      'Automatic metadata, cover art, and lyrics embedding';
+
+  @override
+  String get tutorialSearchTitle => 'Finding Music';
+
+  @override
+  String get tutorialSearchDesc =>
+      'There are two easy ways to find music you want to download.';
+
+  @override
+  String get tutorialSearchTip1 =>
+      'Paste a Spotify or Deezer URL directly in the search box';
+
+  @override
+  String get tutorialSearchTip2 =>
+      'Or type the song name, artist, or album to search';
+
+  @override
+  String get tutorialSearchTip3 =>
+      'Supports tracks, albums, playlists, and artist pages';
+
+  @override
+  String get tutorialDownloadTitle => 'Downloading Music';
+
+  @override
+  String get tutorialDownloadDesc =>
+      'Downloading music is simple and fast. Here\'s how it works.';
+
+  @override
+  String get tutorialDownloadTip1 =>
+      'Tap the download button next to any track to start downloading';
+
+  @override
+  String get tutorialDownloadTip2 =>
+      'Choose your preferred quality (FLAC, Hi-Res, or MP3)';
+
+  @override
+  String get tutorialDownloadTip3 =>
+      'Download entire albums or playlists with one tap';
+
+  @override
+  String get tutorialLibraryTitle => 'Your Library';
+
+  @override
+  String get tutorialLibraryDesc =>
+      'All your downloaded music is organized in the Library tab.';
+
+  @override
+  String get tutorialLibraryTip1 =>
+      'View download progress and queue in the Library tab';
+
+  @override
+  String get tutorialLibraryTip2 =>
+      'Tap any track to play it with your music player';
+
+  @override
+  String get tutorialLibraryTip3 =>
+      'Switch between list and grid view for better browsing';
+
+  @override
+  String get tutorialExtensionsTitle => 'Extensions';
+
+  @override
+  String get tutorialExtensionsDesc =>
+      'Extend the app\'s capabilities with community extensions.';
+
+  @override
+  String get tutorialExtensionsTip1 =>
+      'Browse the Store tab to discover useful extensions';
+
+  @override
+  String get tutorialExtensionsTip2 =>
+      'Add new download providers or search sources';
+
+  @override
+  String get tutorialExtensionsTip3 =>
+      'Get lyrics, enhanced metadata, and more features';
+
+  @override
+  String get tutorialSettingsTitle => 'Customize Your Experience';
+
+  @override
+  String get tutorialSettingsDesc =>
+      'Personalize the app in Settings to match your preferences.';
+
+  @override
+  String get tutorialSettingsTip1 =>
+      'Change download location and folder organization';
+
+  @override
+  String get tutorialSettingsTip2 =>
+      'Set default audio quality and format preferences';
+
+  @override
+  String get tutorialSettingsTip3 => 'Customize app theme and appearance';
+
+  @override
+  String get tutorialReadyMessage =>
+      'You\'re all set! Start downloading your favorite music now.';
+
+  @override
+  String get tutorialExample => 'EXAMPLE';
+
+  @override
+  String get libraryForceFullScan => 'Force Full Scan';
+
+  @override
+  String get libraryForceFullScanSubtitle => 'Rescan all files, ignoring cache';
+
+  @override
+  String get cleanupOrphanedDownloads => 'Cleanup Orphaned Downloads';
+
+  @override
+  String get cleanupOrphanedDownloadsSubtitle =>
+      'Remove history entries for files that no longer exist';
+
+  @override
+  String cleanupOrphanedDownloadsResult(int count) {
+    return 'Removed $count orphaned entries from history';
+  }
+
+  @override
+  String get cleanupOrphanedDownloadsNone => 'No orphaned entries found';
+
+  @override
+  String get cacheTitle => 'Storage & Cache';
+
+  @override
+  String get cacheSummaryTitle => 'Cache overview';
+
+  @override
+  String get cacheSummarySubtitle =>
+      'Clearing cache will not remove downloaded music files.';
+
+  @override
+  String cacheEstimatedTotal(String size) {
+    return 'Estimated cache usage: $size';
+  }
+
+  @override
+  String get cacheSectionStorage => 'Cached Data';
+
+  @override
+  String get cacheSectionMaintenance => 'Maintenance';
+
+  @override
+  String get cacheAppDirectory => 'App cache directory';
+
+  @override
+  String get cacheAppDirectoryDesc =>
+      'HTTP responses, WebView data, and other temporary app data.';
+
+  @override
+  String get cacheTempDirectory => 'Temporary directory';
+
+  @override
+  String get cacheTempDirectoryDesc =>
+      'Temporary files from downloads and audio conversion.';
+
+  @override
+  String get cacheCoverImage => 'Cover image cache';
+
+  @override
+  String get cacheCoverImageDesc =>
+      'Downloaded album and track cover art. Will re-download when viewed.';
+
+  @override
+  String get cacheLibraryCover => 'Library cover cache';
+
+  @override
+  String get cacheLibraryCoverDesc =>
+      'Cover art extracted from local music files. Will re-extract on next scan.';
+
+  @override
+  String get cacheExploreFeed => 'Explore feed cache';
+
+  @override
+  String get cacheExploreFeedDesc =>
+      'Explore tab content (new releases, trending). Will refresh on next visit.';
+
+  @override
+  String get cacheTrackLookup => 'Track lookup cache';
+
+  @override
+  String get cacheTrackLookupDesc =>
+      'Spotify/Deezer track ID lookups. Clearing may slow next few searches.';
+
+  @override
+  String get cacheCleanupUnusedDesc =>
+      'Remove orphaned download history and library entries for missing files.';
+
+  @override
+  String get cacheNoData => 'No cached data';
+
+  @override
+  String cacheSizeWithFiles(String size, int count) {
+    return '$size in $count files';
+  }
+
+  @override
+  String cacheSizeOnly(String size) {
+    return '$size';
+  }
+
+  @override
+  String cacheEntries(int count) {
+    return '$count entries';
+  }
+
+  @override
+  String cacheClearSuccess(String target) {
+    return 'Cleared: $target';
+  }
+
+  @override
+  String get cacheClearConfirmTitle => 'Clear cache?';
+
+  @override
+  String cacheClearConfirmMessage(String target) {
+    return 'This will clear cached data for $target. Downloaded music files will not be deleted.';
+  }
+
+  @override
+  String get cacheClearAllConfirmTitle => 'Clear all cache?';
+
+  @override
+  String get cacheClearAllConfirmMessage =>
+      'This will clear all cache categories on this page. Downloaded music files will not be deleted.';
+
+  @override
+  String get cacheClearAll => 'Clear all cache';
+
+  @override
+  String get cacheCleanupUnused => 'Cleanup unused data';
+
+  @override
+  String get cacheCleanupUnusedSubtitle =>
+      'Remove orphaned download history and missing library entries';
+
+  @override
+  String cacheCleanupResult(int downloadCount, int libraryCount) {
+    return 'Cleanup completed: $downloadCount orphaned downloads, $libraryCount missing library entries';
+  }
+
+  @override
+  String get cacheRefreshStats => 'Refresh stats';
+
+  @override
+  String get trackSaveCoverArt => 'Save Cover Art';
+
+  @override
+  String get trackSaveCoverArtSubtitle => 'Save album art as .jpg file';
+
+  @override
+  String get trackSaveLyrics => 'Save Lyrics (.lrc)';
+
+  @override
+  String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
+
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
+  @override
+  String get trackReEnrich => 'Re-enrich Metadata';
+
+  @override
+  String get trackReEnrichSubtitle =>
+      'Re-embed metadata without re-downloading';
+
+  @override
+  String get trackReEnrichOnlineSubtitle =>
+      'Search metadata online and embed into file';
+
+  @override
+  String get trackEditMetadata => 'Edit Metadata';
+
+  @override
+  String trackCoverSaved(String fileName) {
+    return 'Cover art saved to $fileName';
+  }
+
+  @override
+  String get trackCoverNoSource => 'No cover art source available';
+
+  @override
+  String trackLyricsSaved(String fileName) {
+    return 'Lyrics saved to $fileName';
+  }
+
+  @override
+  String get trackReEnrichProgress => 'Re-enriching metadata...';
+
+  @override
+  String get trackReEnrichSearching => 'Searching metadata online...';
+
+  @override
+  String get trackReEnrichSuccess => 'Metadata re-enriched successfully';
+
+  @override
+  String get trackReEnrichFfmpegFailed => 'FFmpeg metadata embed failed';
+
+  @override
+  String trackSaveFailed(String error) {
+    return 'Failed: $error';
+  }
+
+  @override
+  String get trackConvertFormat => 'Convert Format';
+
+  @override
+  String get trackConvertFormatSubtitle => 'Convert to MP3 or Opus';
+
+  @override
+  String get trackConvertTitle => 'Convert Audio';
+
+  @override
+  String get trackConvertTargetFormat => 'Target Format';
+
+  @override
+  String get trackConvertBitrate => 'Bitrate';
+
+  @override
+  String get trackConvertConfirmTitle => 'Confirm Conversion';
+
+  @override
+  String trackConvertConfirmMessage(
+    String sourceFormat,
+    String targetFormat,
+    String bitrate,
+  ) {
+    return 'Convert from $sourceFormat to $targetFormat at $bitrate?\n\nThe original file will be deleted after conversion.';
+  }
+
+  @override
+  String get trackConvertConverting => 'Converting audio...';
+
+  @override
+  String trackConvertSuccess(String format) {
+    return 'Converted to $format successfully';
+  }
+
+  @override
+  String get trackConvertFailed => 'Conversion failed';
 }
@@ -18,6 +18,9 @@ class AppLocalizationsId extends AppLocalizations {
  @override
  String get navHome => 'Beranda';

+  @override
+  String get navLibrary => 'Library';
+
  @override
  String get navHistory => 'Riwayat';

@@ -344,6 +347,10 @@ class AppLocalizationsId extends AppLocalizations {
  String get optionsSpotifyWarning =>
      'Spotify memerlukan kredensial API Anda sendiri. Dapatkan gratis dari developer.spotify.com';

+  @override
+  String get optionsSpotifyDeprecationWarning =>
+      'Spotify search will be deprecated on March 3, 2026 due to Spotify API changes. Please switch to Deezer.';
+
  @override
  String get extensionsTitle => 'Ekstensi';

@@ -455,12 +462,6 @@ class AppLocalizationsId extends AppLocalizations {
  @override
  String get aboutSupport => 'Dukungan';

-  @override
-  String get aboutBuyMeCoffee => 'Belikan saya kopi';
-
-  @override
-  String get aboutBuyMeCoffeeSubtitle => 'Dukung pengembangan di Ko-fi';
-
  @override
  String get aboutApp => 'Aplikasi';

@@ -493,6 +494,13 @@ class AppLocalizationsId extends AppLocalizations {
  String get aboutDabMusicDesc =>
      'API streaming Qobuz terbaik. Unduhan Hi-Res tidak akan mungkin tanpa ini!';

+  @override
+  String get aboutSpotiSaver => 'SpotiSaver';
+
+  @override
+  String get aboutSpotiSaverDesc =>
+      'Tidal Hi-Res FLAC streaming endpoints. A key piece of the lossless puzzle!';
+
  @override
  String get aboutAppDescription =>
      'Unduh lagu Spotify dalam kualitas lossless dari Tidal, Qobuz, dan Amazon Music.';
@@ -949,6 +957,11 @@ class AppLocalizationsId extends AppLocalizations {
    return '\"$trackName\" sudah diunduh';
  }

+  @override
+  String snackbarAlreadyInLibrary(String trackName) {
+    return '\"$trackName\" already exists in your library';
+  }
+
  @override
  String get snackbarHistoryCleared => 'Riwayat dihapus';

@@ -1175,6 +1188,13 @@ class AppLocalizationsId extends AppLocalizations {
    return '$artist - $title';
  }

+  @override
+  String get filenameShowAdvancedTags => 'Tampilkan tag lanjutan';
+
+  @override
+  String get filenameShowAdvancedTagsDescription =>
+      'Aktifkan tag format untuk padding nomor lagu dan pola tanggal';
+
  @override
  String get folderOrganization => 'Organisasi Folder';

@@ -1911,6 +1931,10 @@ class AppLocalizationsId extends AppLocalizations {
  String get qualityNote =>
      'Kualitas sebenarnya tergantung ketersediaan lagu dari layanan';

+  @override
+  String get youtubeQualityNote =>
+      'YouTube provides lossy audio only. Not part of lossless fallback.';
+
  @override
  String get downloadAskBeforeDownload => 'Tanya Sebelum Unduh';

@@ -1923,6 +1947,28 @@ class AppLocalizationsId extends AppLocalizations {
  @override
  String get downloadAlbumFolderStructure => 'Struktur Folder Album';

+  @override
+  String get downloadUseAlbumArtistForFolders => 'Use Album Artist for folders';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersAlbumSubtitle =>
+      'Artist folders use Album Artist when available';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersTrackSubtitle =>
+      'Artist folders use Track Artist only';
+
+  @override
+  String get downloadUsePrimaryArtistOnly => 'Primary artist only for folders';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyEnabled =>
+      'Featured artists removed from folder name (e.g. Justin Bieber, Quavo → Justin Bieber)';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyDisabled =>
+      'Full artist string used for folder name';
+
  @override
  String get downloadSaveFormat => 'Simpan Format';

@@ -2023,6 +2069,19 @@ class AppLocalizationsId extends AppLocalizations {
  String get settingsAutoExportFailedSubtitle =>
      'Save failed downloads to TXT file automatically';

+  @override
+  String get settingsDownloadNetwork => 'Download Network';
+
+  @override
+  String get settingsDownloadNetworkAny => 'WiFi + Mobile Data';
+
+  @override
+  String get settingsDownloadNetworkWifiOnly => 'WiFi Only';
+
+  @override
+  String get settingsDownloadNetworkSubtitle =>
+      'Choose which network to use for downloads. When set to WiFi Only, downloads will pause on mobile data.';
+
  @override
  String get queueEmpty => 'Tidak ada unduhan dalam antrian';

@@ -2146,6 +2205,12 @@ class AppLocalizationsId extends AppLocalizations {
  @override
  String get recentTypePlaylist => 'Playlist';

+  @override
+  String get recentEmpty => 'No recent items yet';
+
+  @override
+  String get recentShowAllDownloads => 'Show All Downloads';
+
  @override
  String recentPlaylistInfo(String name) {
    return 'Playlist: $name';
@@ -2245,4 +2310,649 @@ class AppLocalizationsId extends AppLocalizations {
  @override
  String get allFilesAccessDisabledMessage =>
      'All Files Access disabled. The app will use limited storage access.';
+
+  @override
+  String get settingsLocalLibrary => 'Local Library';
+
+  @override
+  String get settingsLocalLibrarySubtitle => 'Scan music & detect duplicates';
+
+  @override
+  String get settingsCache => 'Storage & Cache';
+
+  @override
+  String get settingsCacheSubtitle => 'View size and clear cached data';
+
+  @override
+  String get libraryTitle => 'Local Library';
+
+  @override
+  String get libraryStatus => 'Library Status';
+
+  @override
+  String get libraryScanSettings => 'Scan Settings';
+
+  @override
+  String get libraryEnableLocalLibrary => 'Enable Local Library';
+
+  @override
+  String get libraryEnableLocalLibrarySubtitle =>
+      'Scan and track your existing music';
+
+  @override
+  String get libraryFolder => 'Library Folder';
+
+  @override
+  String get libraryFolderHint => 'Tap to select folder';
+
+  @override
+  String get libraryShowDuplicateIndicator => 'Show Duplicate Indicator';
+
+  @override
+  String get libraryShowDuplicateIndicatorSubtitle =>
+      'Show when searching for existing tracks';
+
+  @override
+  String get libraryActions => 'Actions';
+
+  @override
+  String get libraryScan => 'Scan Library';
+
+  @override
+  String get libraryScanSubtitle => 'Scan for audio files';
+
+  @override
+  String get libraryScanSelectFolderFirst => 'Select a folder first';
+
+  @override
+  String get libraryCleanupMissingFiles => 'Cleanup Missing Files';
+
+  @override
+  String get libraryCleanupMissingFilesSubtitle =>
+      'Remove entries for files that no longer exist';
+
+  @override
+  String get libraryClear => 'Clear Library';
+
+  @override
+  String get libraryClearSubtitle => 'Remove all scanned tracks';
+
+  @override
+  String get libraryClearConfirmTitle => 'Clear Library';
+
+  @override
+  String get libraryClearConfirmMessage =>
+      'This will remove all scanned tracks from your library. Your actual music files will not be deleted.';
+
+  @override
+  String get libraryAbout => 'About Local Library';
+
+  @override
+  String get libraryAboutDescription =>
+      'Scans your existing music collection to detect duplicates when downloading. Supports FLAC, M4A, MP3, Opus, and OGG formats. Metadata is read from file tags when available.';
+
+  @override
+  String libraryTracksCount(int count) {
+    return '$count tracks';
+  }
+
+  @override
+  String libraryLastScanned(String time) {
+    return 'Last scanned: $time';
+  }
+
+  @override
+  String get libraryLastScannedNever => 'Never';
+
+  @override
+  String get libraryScanning => 'Scanning...';
+
+  @override
+  String libraryScanProgress(String progress, int total) {
+    return '$progress% of $total files';
+  }
+
+  @override
+  String get libraryInLibrary => 'In Library';
+
+  @override
+  String libraryRemovedMissingFiles(int count) {
+    return 'Removed $count missing files from library';
+  }
+
+  @override
+  String get libraryCleared => 'Library cleared';
+
+  @override
+  String get libraryStorageAccessRequired => 'Storage Access Required';
+
+  @override
+  String get libraryStorageAccessMessage =>
+      'SpotiFLAC needs storage access to scan your music library. Please grant permission in settings.';
+
+  @override
+  String get libraryFolderNotExist => 'Selected folder does not exist';
+
+  @override
+  String get librarySourceDownloaded => 'Downloaded';
+
+  @override
+  String get librarySourceLocal => 'Local';
+
+  @override
+  String get libraryFilterAll => 'All';
+
+  @override
+  String get libraryFilterDownloaded => 'Downloaded';
+
+  @override
+  String get libraryFilterLocal => 'Local';
+
+  @override
+  String get libraryFilterTitle => 'Filters';
+
+  @override
+  String get libraryFilterReset => 'Reset';
+
+  @override
+  String get libraryFilterApply => 'Apply';
+
+  @override
+  String get libraryFilterSource => 'Source';
+
+  @override
+  String get libraryFilterQuality => 'Quality';
+
+  @override
+  String get libraryFilterQualityHiRes => 'Hi-Res (24bit)';
+
+  @override
+  String get libraryFilterQualityCD => 'CD (16bit)';
+
+  @override
+  String get libraryFilterQualityLossy => 'Lossy';
+
+  @override
+  String get libraryFilterFormat => 'Format';
+
+  @override
+  String get libraryFilterDate => 'Date Added';
+
+  @override
+  String get libraryFilterDateToday => 'Today';
+
+  @override
+  String get libraryFilterDateWeek => 'This Week';
+
+  @override
+  String get libraryFilterDateMonth => 'This Month';
+
+  @override
+  String get libraryFilterDateYear => 'This Year';
+
+  @override
+  String get libraryFilterSort => 'Sort';
+
+  @override
+  String get libraryFilterSortLatest => 'Latest';
+
+  @override
+  String get libraryFilterSortOldest => 'Oldest';
+
+  @override
+  String libraryFilterActive(int count) {
+    return '$count filter(s) active';
+  }
+
+  @override
+  String get timeJustNow => 'Just now';
+
+  @override
+  String timeMinutesAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count minutes ago',
+      one: '1 minute ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String timeHoursAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count hours ago',
+      one: '1 hour ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String get storageSwitchTitle => 'Switch Storage Mode';
+
+  @override
+  String get storageSwitchToSafTitle => 'Switch to SAF Storage?';
+
+  @override
+  String get storageSwitchToAppTitle => 'Switch to App Storage?';
+
+  @override
+  String get storageSwitchToSafMessage =>
+      'Your existing downloads will remain in the current location and stay accessible.\n\nNew downloads will be saved to your selected SAF folder.';
+
+  @override
+  String get storageSwitchToAppMessage =>
+      'Your existing downloads will remain in the current SAF location and stay accessible.\n\nNew downloads will be saved to Music/SpotiFLAC folder.';
+
+  @override
+  String get storageSwitchExistingDownloads => 'Existing Downloads';
+
+  @override
+  String storageSwitchExistingDownloadsInfo(int count, String mode) {
+    return '$count tracks in $mode storage';
+  }
+
+  @override
+  String get storageSwitchNewDownloads => 'New Downloads';
+
+  @override
+  String storageSwitchNewDownloadsLocation(String location) {
+    return 'Will be saved to: $location';
+  }
+
+  @override
+  String get storageSwitchContinue => 'Continue';
+
+  @override
+  String get storageSwitchSelectFolder => 'Select SAF Folder';
+
+  @override
+  String get storageAppStorage => 'App Storage';
+
+  @override
+  String get storageSafStorage => 'SAF Storage';
+
+  @override
+  String storageModeBadge(String mode) {
+    return 'Storage: $mode';
+  }
+
+  @override
+  String get storageStatsTitle => 'Storage Statistics';
+
+  @override
+  String storageStatsAppCount(int count) {
+    return '$count tracks in App Storage';
+  }
+
+  @override
+  String storageStatsSafCount(int count) {
+    return '$count tracks in SAF Storage';
+  }
+
+  @override
+  String get storageModeInfo => 'Your files are stored in multiple locations';
+
+  @override
+  String get tutorialWelcomeTitle => 'Welcome to SpotiFLAC!';
+
+  @override
+  String get tutorialWelcomeDesc =>
+      'Let\'s learn how to download your favorite music in lossless quality. This quick tutorial will show you the basics.';
+
+  @override
+  String get tutorialWelcomeTip1 =>
+      'Download music from Spotify, Deezer, or paste any supported URL';
+
+  @override
+  String get tutorialWelcomeTip2 =>
+      'Get FLAC quality audio from Tidal, Qobuz, or Amazon Music';
+
+  @override
+  String get tutorialWelcomeTip3 =>
+      'Automatic metadata, cover art, and lyrics embedding';
+
+  @override
+  String get tutorialSearchTitle => 'Finding Music';
+
+  @override
+  String get tutorialSearchDesc =>
+      'There are two easy ways to find music you want to download.';
+
+  @override
+  String get tutorialSearchTip1 =>
+      'Paste a Spotify or Deezer URL directly in the search box';
+
+  @override
+  String get tutorialSearchTip2 =>
+      'Or type the song name, artist, or album to search';
+
+  @override
+  String get tutorialSearchTip3 =>
+      'Supports tracks, albums, playlists, and artist pages';
+
+  @override
+  String get tutorialDownloadTitle => 'Downloading Music';
+
+  @override
+  String get tutorialDownloadDesc =>
+      'Downloading music is simple and fast. Here\'s how it works.';
+
+  @override
+  String get tutorialDownloadTip1 =>
+      'Tap the download button next to any track to start downloading';
+
+  @override
+  String get tutorialDownloadTip2 =>
+      'Choose your preferred quality (FLAC, Hi-Res, or MP3)';
+
+  @override
+  String get tutorialDownloadTip3 =>
+      'Download entire albums or playlists with one tap';
+
+  @override
+  String get tutorialLibraryTitle => 'Your Library';
+
+  @override
+  String get tutorialLibraryDesc =>
+      'All your downloaded music is organized in the Library tab.';
+
+  @override
+  String get tutorialLibraryTip1 =>
+      'View download progress and queue in the Library tab';
+
+  @override
+  String get tutorialLibraryTip2 =>
+      'Tap any track to play it with your music player';
+
+  @override
+  String get tutorialLibraryTip3 =>
+      'Switch between list and grid view for better browsing';
+
+  @override
+  String get tutorialExtensionsTitle => 'Extensions';
+
+  @override
+  String get tutorialExtensionsDesc =>
+      'Extend the app\'s capabilities with community extensions.';
+
+  @override
+  String get tutorialExtensionsTip1 =>
+      'Browse the Store tab to discover useful extensions';
+
+  @override
+  String get tutorialExtensionsTip2 =>
+      'Add new download providers or search sources';
+
+  @override
+  String get tutorialExtensionsTip3 =>
+      'Get lyrics, enhanced metadata, and more features';
+
+  @override
+  String get tutorialSettingsTitle => 'Customize Your Experience';
+
+  @override
+  String get tutorialSettingsDesc =>
+      'Personalize the app in Settings to match your preferences.';
+
+  @override
+  String get tutorialSettingsTip1 =>
+      'Change download location and folder organization';
+
+  @override
+  String get tutorialSettingsTip2 =>
+      'Set default audio quality and format preferences';
+
+  @override
+  String get tutorialSettingsTip3 => 'Customize app theme and appearance';
+
+  @override
+  String get tutorialReadyMessage =>
+      'You\'re all set! Start downloading your favorite music now.';
+
+  @override
+  String get tutorialExample => 'EXAMPLE';
+
+  @override
+  String get libraryForceFullScan => 'Force Full Scan';
+
+  @override
+  String get libraryForceFullScanSubtitle => 'Rescan all files, ignoring cache';
+
+  @override
+  String get cleanupOrphanedDownloads => 'Cleanup Orphaned Downloads';
+
+  @override
+  String get cleanupOrphanedDownloadsSubtitle =>
+      'Remove history entries for files that no longer exist';
+
+  @override
+  String cleanupOrphanedDownloadsResult(int count) {
+    return 'Removed $count orphaned entries from history';
+  }
+
+  @override
+  String get cleanupOrphanedDownloadsNone => 'No orphaned entries found';
+
+  @override
+  String get cacheTitle => 'Storage & Cache';
+
+  @override
+  String get cacheSummaryTitle => 'Cache overview';
+
+  @override
+  String get cacheSummarySubtitle =>
+      'Clearing cache will not remove downloaded music files.';
+
+  @override
+  String cacheEstimatedTotal(String size) {
+    return 'Estimated cache usage: $size';
+  }
+
+  @override
+  String get cacheSectionStorage => 'Cached Data';
+
+  @override
+  String get cacheSectionMaintenance => 'Maintenance';
+
+  @override
+  String get cacheAppDirectory => 'App cache directory';
+
+  @override
+  String get cacheAppDirectoryDesc =>
+      'HTTP responses, WebView data, and other temporary app data.';
+
+  @override
+  String get cacheTempDirectory => 'Temporary directory';
+
+  @override
+  String get cacheTempDirectoryDesc =>
+      'Temporary files from downloads and audio conversion.';
+
+  @override
+  String get cacheCoverImage => 'Cover image cache';
+
+  @override
+  String get cacheCoverImageDesc =>
+      'Downloaded album and track cover art. Will re-download when viewed.';
+
+  @override
+  String get cacheLibraryCover => 'Library cover cache';
+
+  @override
+  String get cacheLibraryCoverDesc =>
+      'Cover art extracted from local music files. Will re-extract on next scan.';
+
+  @override
+  String get cacheExploreFeed => 'Explore feed cache';
+
+  @override
+  String get cacheExploreFeedDesc =>
+      'Explore tab content (new releases, trending). Will refresh on next visit.';
+
+  @override
+  String get cacheTrackLookup => 'Track lookup cache';
+
+  @override
+  String get cacheTrackLookupDesc =>
+      'Spotify/Deezer track ID lookups. Clearing may slow next few searches.';
+
+  @override
+  String get cacheCleanupUnusedDesc =>
+      'Remove orphaned download history and library entries for missing files.';
+
+  @override
+  String get cacheNoData => 'No cached data';
+
+  @override
+  String cacheSizeWithFiles(String size, int count) {
+    return '$size in $count files';
+  }
+
+  @override
+  String cacheSizeOnly(String size) {
+    return '$size';
+  }
+
+  @override
+  String cacheEntries(int count) {
+    return '$count entries';
+  }
+
+  @override
+  String cacheClearSuccess(String target) {
+    return 'Cleared: $target';
+  }
+
+  @override
+  String get cacheClearConfirmTitle => 'Clear cache?';
+
+  @override
+  String cacheClearConfirmMessage(String target) {
+    return 'This will clear cached data for $target. Downloaded music files will not be deleted.';
+  }
+
+  @override
+  String get cacheClearAllConfirmTitle => 'Clear all cache?';
+
+  @override
+  String get cacheClearAllConfirmMessage =>
+      'This will clear all cache categories on this page. Downloaded music files will not be deleted.';
+
+  @override
+  String get cacheClearAll => 'Clear all cache';
+
+  @override
+  String get cacheCleanupUnused => 'Cleanup unused data';
+
+  @override
+  String get cacheCleanupUnusedSubtitle =>
+      'Remove orphaned download history and missing library entries';
+
+  @override
+  String cacheCleanupResult(int downloadCount, int libraryCount) {
+    return 'Cleanup completed: $downloadCount orphaned downloads, $libraryCount missing library entries';
+  }
+
+  @override
+  String get cacheRefreshStats => 'Refresh stats';
+
+  @override
+  String get trackSaveCoverArt => 'Save Cover Art';
+
+  @override
+  String get trackSaveCoverArtSubtitle => 'Save album art as .jpg file';
+
+  @override
+  String get trackSaveLyrics => 'Save Lyrics (.lrc)';
+
+  @override
+  String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
+
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
+  @override
+  String get trackReEnrich => 'Re-enrich Metadata';
+
+  @override
+  String get trackReEnrichSubtitle =>
+      'Re-embed metadata without re-downloading';
+
+  @override
+  String get trackReEnrichOnlineSubtitle =>
+      'Search metadata online and embed into file';
+
+  @override
+  String get trackEditMetadata => 'Edit Metadata';
+
+  @override
+  String trackCoverSaved(String fileName) {
+    return 'Cover art saved to $fileName';
+  }
+
+  @override
+  String get trackCoverNoSource => 'No cover art source available';
+
+  @override
+  String trackLyricsSaved(String fileName) {
+    return 'Lyrics saved to $fileName';
+  }
+
+  @override
+  String get trackReEnrichProgress => 'Re-enriching metadata...';
+
+  @override
+  String get trackReEnrichSearching => 'Searching metadata online...';
+
+  @override
+  String get trackReEnrichSuccess => 'Metadata re-enriched successfully';
+
+  @override
+  String get trackReEnrichFfmpegFailed => 'FFmpeg metadata embed failed';
+
+  @override
+  String trackSaveFailed(String error) {
+    return 'Failed: $error';
+  }
+
+  @override
+  String get trackConvertFormat => 'Convert Format';
+
+  @override
+  String get trackConvertFormatSubtitle => 'Convert to MP3 or Opus';
+
+  @override
+  String get trackConvertTitle => 'Convert Audio';
+
+  @override
+  String get trackConvertTargetFormat => 'Target Format';
+
+  @override
+  String get trackConvertBitrate => 'Bitrate';
+
+  @override
+  String get trackConvertConfirmTitle => 'Confirm Conversion';
+
+  @override
+  String trackConvertConfirmMessage(
+    String sourceFormat,
+    String targetFormat,
+    String bitrate,
+  ) {
+    return 'Convert from $sourceFormat to $targetFormat at $bitrate?\n\nThe original file will be deleted after conversion.';
+  }
+
+  @override
+  String get trackConvertConverting => 'Converting audio...';
+
+  @override
+  String trackConvertSuccess(String format) {
+    return 'Converted to $format successfully';
+  }
+
+  @override
+  String get trackConvertFailed => 'Conversion failed';
 }
@@ -18,6 +18,9 @@ class AppLocalizationsJa extends AppLocalizations {
  @override
  String get navHome => 'ホーム';

+  @override
+  String get navLibrary => 'Library';
+
  @override
  String get navHistory => '履歴';

@@ -337,6 +340,10 @@ class AppLocalizationsJa extends AppLocalizations {
  String get optionsSpotifyWarning =>
      'Spotify は独自の API 認証情報が必要です。developer.spotify.com から取得できます。';

+  @override
+  String get optionsSpotifyDeprecationWarning =>
+      'Spotify search will be deprecated on March 3, 2026 due to Spotify API changes. Please switch to Deezer.';
+
  @override
  String get extensionsTitle => '拡張';

@@ -446,12 +453,6 @@ class AppLocalizationsJa extends AppLocalizations {
  @override
  String get aboutSupport => 'サポート';

-  @override
-  String get aboutBuyMeCoffee => 'コーヒーを買ってください';
-
-  @override
-  String get aboutBuyMeCoffeeSubtitle => 'Ko-fi で開発をサポートします';
-
  @override
  String get aboutApp => 'アプリ';

@@ -484,6 +485,13 @@ class AppLocalizationsJa extends AppLocalizations {
  String get aboutDabMusicDesc =>
      'The best Qobuz streaming API. Hi-Res downloads wouldn\'t be possible without this!';

+  @override
+  String get aboutSpotiSaver => 'SpotiSaver';
+
+  @override
+  String get aboutSpotiSaverDesc =>
+      'Tidal Hi-Res FLAC streaming endpoints. A key piece of the lossless puzzle!';
+
  @override
  String get aboutAppDescription =>
      'Tidal、Qobuz、Amazon Music から Spotify のトラックをロスレス品質でダウンロードします。';
@@ -938,6 +946,11 @@ class AppLocalizationsJa extends AppLocalizations {
    return '「$trackName」は既にダウンロードされています';
  }

+  @override
+  String snackbarAlreadyInLibrary(String trackName) {
+    return '\"$trackName\" already exists in your library';
+  }
+
  @override
  String get snackbarHistoryCleared => '履歴を消去しました';

@@ -1163,6 +1176,13 @@ class AppLocalizationsJa extends AppLocalizations {
    return '$artist - $title';
  }

+  @override
+  String get filenameShowAdvancedTags => 'Show advanced tags';
+
+  @override
+  String get filenameShowAdvancedTagsDescription =>
+      'Enable formatted tags for track padding and date patterns';
+
  @override
  String get folderOrganization => 'フォルダ構成';

@@ -1887,6 +1907,10 @@ class AppLocalizationsJa extends AppLocalizations {
  @override
  String get qualityNote => '実際の品質はサービスからのトラックの可用性に依存します';

+  @override
+  String get youtubeQualityNote =>
+      'YouTube provides lossy audio only. Not part of lossless fallback.';
+
  @override
  String get downloadAskBeforeDownload => 'ダウンロード前に確認する';

@@ -1899,6 +1923,28 @@ class AppLocalizationsJa extends AppLocalizations {
  @override
  String get downloadAlbumFolderStructure => 'アルバムフォルダの構造';

+  @override
+  String get downloadUseAlbumArtistForFolders => 'Use Album Artist for folders';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersAlbumSubtitle =>
+      'Artist folders use Album Artist when available';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersTrackSubtitle =>
+      'Artist folders use Track Artist only';
+
+  @override
+  String get downloadUsePrimaryArtistOnly => 'Primary artist only for folders';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyEnabled =>
+      'Featured artists removed from folder name (e.g. Justin Bieber, Quavo → Justin Bieber)';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyDisabled =>
+      'Full artist string used for folder name';
+
  @override
  String get downloadSaveFormat => '形式を保存';

@@ -1997,6 +2043,19 @@ class AppLocalizationsJa extends AppLocalizations {
  String get settingsAutoExportFailedSubtitle =>
      'Save failed downloads to TXT file automatically';

+  @override
+  String get settingsDownloadNetwork => 'Download Network';
+
+  @override
+  String get settingsDownloadNetworkAny => 'WiFi + Mobile Data';
+
+  @override
+  String get settingsDownloadNetworkWifiOnly => 'WiFi Only';
+
+  @override
+  String get settingsDownloadNetworkSubtitle =>
+      'Choose which network to use for downloads. When set to WiFi Only, downloads will pause on mobile data.';
+
  @override
  String get queueEmpty => 'キューにダウンロードがありません';

@@ -2119,6 +2178,12 @@ class AppLocalizationsJa extends AppLocalizations {
  @override
  String get recentTypePlaylist => 'プレイリスト';

+  @override
+  String get recentEmpty => 'No recent items yet';
+
+  @override
+  String get recentShowAllDownloads => 'Show All Downloads';
+
  @override
  String recentPlaylistInfo(String name) {
    return 'プレイリスト: $name';
@@ -2218,4 +2283,649 @@ class AppLocalizationsJa extends AppLocalizations {
  @override
  String get allFilesAccessDisabledMessage =>
      'All Files Access disabled. The app will use limited storage access.';
+
+  @override
+  String get settingsLocalLibrary => 'Local Library';
+
+  @override
+  String get settingsLocalLibrarySubtitle => 'Scan music & detect duplicates';
+
+  @override
+  String get settingsCache => 'Storage & Cache';
+
+  @override
+  String get settingsCacheSubtitle => 'View size and clear cached data';
+
+  @override
+  String get libraryTitle => 'Local Library';
+
+  @override
+  String get libraryStatus => 'Library Status';
+
+  @override
+  String get libraryScanSettings => 'Scan Settings';
+
+  @override
+  String get libraryEnableLocalLibrary => 'Enable Local Library';
+
+  @override
+  String get libraryEnableLocalLibrarySubtitle =>
+      'Scan and track your existing music';
+
+  @override
+  String get libraryFolder => 'Library Folder';
+
+  @override
+  String get libraryFolderHint => 'Tap to select folder';
+
+  @override
+  String get libraryShowDuplicateIndicator => 'Show Duplicate Indicator';
+
+  @override
+  String get libraryShowDuplicateIndicatorSubtitle =>
+      'Show when searching for existing tracks';
+
+  @override
+  String get libraryActions => 'Actions';
+
+  @override
+  String get libraryScan => 'Scan Library';
+
+  @override
+  String get libraryScanSubtitle => 'Scan for audio files';
+
+  @override
+  String get libraryScanSelectFolderFirst => 'Select a folder first';
+
+  @override
+  String get libraryCleanupMissingFiles => 'Cleanup Missing Files';
+
+  @override
+  String get libraryCleanupMissingFilesSubtitle =>
+      'Remove entries for files that no longer exist';
+
+  @override
+  String get libraryClear => 'Clear Library';
+
+  @override
+  String get libraryClearSubtitle => 'Remove all scanned tracks';
+
+  @override
+  String get libraryClearConfirmTitle => 'Clear Library';
+
+  @override
+  String get libraryClearConfirmMessage =>
+      'This will remove all scanned tracks from your library. Your actual music files will not be deleted.';
+
+  @override
+  String get libraryAbout => 'About Local Library';
+
+  @override
+  String get libraryAboutDescription =>
+      'Scans your existing music collection to detect duplicates when downloading. Supports FLAC, M4A, MP3, Opus, and OGG formats. Metadata is read from file tags when available.';
+
+  @override
+  String libraryTracksCount(int count) {
+    return '$count tracks';
+  }
+
+  @override
+  String libraryLastScanned(String time) {
+    return 'Last scanned: $time';
+  }
+
+  @override
+  String get libraryLastScannedNever => 'Never';
+
+  @override
+  String get libraryScanning => 'Scanning...';
+
+  @override
+  String libraryScanProgress(String progress, int total) {
+    return '$progress% of $total files';
+  }
+
+  @override
+  String get libraryInLibrary => 'In Library';
+
+  @override
+  String libraryRemovedMissingFiles(int count) {
+    return 'Removed $count missing files from library';
+  }
+
+  @override
+  String get libraryCleared => 'Library cleared';
+
+  @override
+  String get libraryStorageAccessRequired => 'Storage Access Required';
+
+  @override
+  String get libraryStorageAccessMessage =>
+      'SpotiFLAC needs storage access to scan your music library. Please grant permission in settings.';
+
+  @override
+  String get libraryFolderNotExist => 'Selected folder does not exist';
+
+  @override
+  String get librarySourceDownloaded => 'Downloaded';
+
+  @override
+  String get librarySourceLocal => 'Local';
+
+  @override
+  String get libraryFilterAll => 'All';
+
+  @override
+  String get libraryFilterDownloaded => 'Downloaded';
+
+  @override
+  String get libraryFilterLocal => 'Local';
+
+  @override
+  String get libraryFilterTitle => 'Filters';
+
+  @override
+  String get libraryFilterReset => 'Reset';
+
+  @override
+  String get libraryFilterApply => 'Apply';
+
+  @override
+  String get libraryFilterSource => 'Source';
+
+  @override
+  String get libraryFilterQuality => 'Quality';
+
+  @override
+  String get libraryFilterQualityHiRes => 'Hi-Res (24bit)';
+
+  @override
+  String get libraryFilterQualityCD => 'CD (16bit)';
+
+  @override
+  String get libraryFilterQualityLossy => 'Lossy';
+
+  @override
+  String get libraryFilterFormat => 'Format';
+
+  @override
+  String get libraryFilterDate => 'Date Added';
+
+  @override
+  String get libraryFilterDateToday => 'Today';
+
+  @override
+  String get libraryFilterDateWeek => 'This Week';
+
+  @override
+  String get libraryFilterDateMonth => 'This Month';
+
+  @override
+  String get libraryFilterDateYear => 'This Year';
+
+  @override
+  String get libraryFilterSort => 'Sort';
+
+  @override
+  String get libraryFilterSortLatest => 'Latest';
+
+  @override
+  String get libraryFilterSortOldest => 'Oldest';
+
+  @override
+  String libraryFilterActive(int count) {
+    return '$count filter(s) active';
+  }
+
+  @override
+  String get timeJustNow => 'Just now';
+
+  @override
+  String timeMinutesAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count minutes ago',
+      one: '1 minute ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String timeHoursAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count hours ago',
+      one: '1 hour ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String get storageSwitchTitle => 'Switch Storage Mode';
+
+  @override
+  String get storageSwitchToSafTitle => 'Switch to SAF Storage?';
+
+  @override
+  String get storageSwitchToAppTitle => 'Switch to App Storage?';
+
+  @override
+  String get storageSwitchToSafMessage =>
+      'Your existing downloads will remain in the current location and stay accessible.\n\nNew downloads will be saved to your selected SAF folder.';
+
+  @override
+  String get storageSwitchToAppMessage =>
+      'Your existing downloads will remain in the current SAF location and stay accessible.\n\nNew downloads will be saved to Music/SpotiFLAC folder.';
+
+  @override
+  String get storageSwitchExistingDownloads => 'Existing Downloads';
+
+  @override
+  String storageSwitchExistingDownloadsInfo(int count, String mode) {
+    return '$count tracks in $mode storage';
+  }
+
+  @override
+  String get storageSwitchNewDownloads => 'New Downloads';
+
+  @override
+  String storageSwitchNewDownloadsLocation(String location) {
+    return 'Will be saved to: $location';
+  }
+
+  @override
+  String get storageSwitchContinue => 'Continue';
+
+  @override
+  String get storageSwitchSelectFolder => 'Select SAF Folder';
+
+  @override
+  String get storageAppStorage => 'App Storage';
+
+  @override
+  String get storageSafStorage => 'SAF Storage';
+
+  @override
+  String storageModeBadge(String mode) {
+    return 'Storage: $mode';
+  }
+
+  @override
+  String get storageStatsTitle => 'Storage Statistics';
+
+  @override
+  String storageStatsAppCount(int count) {
+    return '$count tracks in App Storage';
+  }
+
+  @override
+  String storageStatsSafCount(int count) {
+    return '$count tracks in SAF Storage';
+  }
+
+  @override
+  String get storageModeInfo => 'Your files are stored in multiple locations';
+
+  @override
+  String get tutorialWelcomeTitle => 'Welcome to SpotiFLAC!';
+
+  @override
+  String get tutorialWelcomeDesc =>
+      'Let\'s learn how to download your favorite music in lossless quality. This quick tutorial will show you the basics.';
+
+  @override
+  String get tutorialWelcomeTip1 =>
+      'Download music from Spotify, Deezer, or paste any supported URL';
+
+  @override
+  String get tutorialWelcomeTip2 =>
+      'Get FLAC quality audio from Tidal, Qobuz, or Amazon Music';
+
+  @override
+  String get tutorialWelcomeTip3 =>
+      'Automatic metadata, cover art, and lyrics embedding';
+
+  @override
+  String get tutorialSearchTitle => 'Finding Music';
+
+  @override
+  String get tutorialSearchDesc =>
+      'There are two easy ways to find music you want to download.';
+
+  @override
+  String get tutorialSearchTip1 =>
+      'Paste a Spotify or Deezer URL directly in the search box';
+
+  @override
+  String get tutorialSearchTip2 =>
+      'Or type the song name, artist, or album to search';
+
+  @override
+  String get tutorialSearchTip3 =>
+      'Supports tracks, albums, playlists, and artist pages';
+
+  @override
+  String get tutorialDownloadTitle => 'Downloading Music';
+
+  @override
+  String get tutorialDownloadDesc =>
+      'Downloading music is simple and fast. Here\'s how it works.';
+
+  @override
+  String get tutorialDownloadTip1 =>
+      'Tap the download button next to any track to start downloading';
+
+  @override
+  String get tutorialDownloadTip2 =>
+      'Choose your preferred quality (FLAC, Hi-Res, or MP3)';
+
+  @override
+  String get tutorialDownloadTip3 =>
+      'Download entire albums or playlists with one tap';
+
+  @override
+  String get tutorialLibraryTitle => 'Your Library';
+
+  @override
+  String get tutorialLibraryDesc =>
+      'All your downloaded music is organized in the Library tab.';
+
+  @override
+  String get tutorialLibraryTip1 =>
+      'View download progress and queue in the Library tab';
+
+  @override
+  String get tutorialLibraryTip2 =>
+      'Tap any track to play it with your music player';
+
+  @override
+  String get tutorialLibraryTip3 =>
+      'Switch between list and grid view for better browsing';
+
+  @override
+  String get tutorialExtensionsTitle => 'Extensions';
+
+  @override
+  String get tutorialExtensionsDesc =>
+      'Extend the app\'s capabilities with community extensions.';
+
+  @override
+  String get tutorialExtensionsTip1 =>
+      'Browse the Store tab to discover useful extensions';
+
+  @override
+  String get tutorialExtensionsTip2 =>
+      'Add new download providers or search sources';
+
+  @override
+  String get tutorialExtensionsTip3 =>
+      'Get lyrics, enhanced metadata, and more features';
+
+  @override
+  String get tutorialSettingsTitle => 'Customize Your Experience';
+
+  @override
+  String get tutorialSettingsDesc =>
+      'Personalize the app in Settings to match your preferences.';
+
+  @override
+  String get tutorialSettingsTip1 =>
+      'Change download location and folder organization';
+
+  @override
+  String get tutorialSettingsTip2 =>
+      'Set default audio quality and format preferences';
+
+  @override
+  String get tutorialSettingsTip3 => 'Customize app theme and appearance';
+
+  @override
+  String get tutorialReadyMessage =>
+      'You\'re all set! Start downloading your favorite music now.';
+
+  @override
+  String get tutorialExample => 'EXAMPLE';
+
+  @override
+  String get libraryForceFullScan => 'Force Full Scan';
+
+  @override
+  String get libraryForceFullScanSubtitle => 'Rescan all files, ignoring cache';
+
+  @override
+  String get cleanupOrphanedDownloads => 'Cleanup Orphaned Downloads';
+
+  @override
+  String get cleanupOrphanedDownloadsSubtitle =>
+      'Remove history entries for files that no longer exist';
+
+  @override
+  String cleanupOrphanedDownloadsResult(int count) {
+    return 'Removed $count orphaned entries from history';
+  }
+
+  @override
+  String get cleanupOrphanedDownloadsNone => 'No orphaned entries found';
+
+  @override
+  String get cacheTitle => 'Storage & Cache';
+
+  @override
+  String get cacheSummaryTitle => 'Cache overview';
+
+  @override
+  String get cacheSummarySubtitle =>
+      'Clearing cache will not remove downloaded music files.';
+
+  @override
+  String cacheEstimatedTotal(String size) {
+    return 'Estimated cache usage: $size';
+  }
+
+  @override
+  String get cacheSectionStorage => 'Cached Data';
+
+  @override
+  String get cacheSectionMaintenance => 'Maintenance';
+
+  @override
+  String get cacheAppDirectory => 'App cache directory';
+
+  @override
+  String get cacheAppDirectoryDesc =>
+      'HTTP responses, WebView data, and other temporary app data.';
+
+  @override
+  String get cacheTempDirectory => 'Temporary directory';
+
+  @override
+  String get cacheTempDirectoryDesc =>
+      'Temporary files from downloads and audio conversion.';
+
+  @override
+  String get cacheCoverImage => 'Cover image cache';
+
+  @override
+  String get cacheCoverImageDesc =>
+      'Downloaded album and track cover art. Will re-download when viewed.';
+
+  @override
+  String get cacheLibraryCover => 'Library cover cache';
+
+  @override
+  String get cacheLibraryCoverDesc =>
+      'Cover art extracted from local music files. Will re-extract on next scan.';
+
+  @override
+  String get cacheExploreFeed => 'Explore feed cache';
+
+  @override
+  String get cacheExploreFeedDesc =>
+      'Explore tab content (new releases, trending). Will refresh on next visit.';
+
+  @override
+  String get cacheTrackLookup => 'Track lookup cache';
+
+  @override
+  String get cacheTrackLookupDesc =>
+      'Spotify/Deezer track ID lookups. Clearing may slow next few searches.';
+
+  @override
+  String get cacheCleanupUnusedDesc =>
+      'Remove orphaned download history and library entries for missing files.';
+
+  @override
+  String get cacheNoData => 'No cached data';
+
+  @override
+  String cacheSizeWithFiles(String size, int count) {
+    return '$size in $count files';
+  }
+
+  @override
+  String cacheSizeOnly(String size) {
+    return '$size';
+  }
+
+  @override
+  String cacheEntries(int count) {
+    return '$count entries';
+  }
+
+  @override
+  String cacheClearSuccess(String target) {
+    return 'Cleared: $target';
+  }
+
+  @override
+  String get cacheClearConfirmTitle => 'Clear cache?';
+
+  @override
+  String cacheClearConfirmMessage(String target) {
+    return 'This will clear cached data for $target. Downloaded music files will not be deleted.';
+  }
+
+  @override
+  String get cacheClearAllConfirmTitle => 'Clear all cache?';
+
+  @override
+  String get cacheClearAllConfirmMessage =>
+      'This will clear all cache categories on this page. Downloaded music files will not be deleted.';
+
+  @override
+  String get cacheClearAll => 'Clear all cache';
+
+  @override
+  String get cacheCleanupUnused => 'Cleanup unused data';
+
+  @override
+  String get cacheCleanupUnusedSubtitle =>
+      'Remove orphaned download history and missing library entries';
+
+  @override
+  String cacheCleanupResult(int downloadCount, int libraryCount) {
+    return 'Cleanup completed: $downloadCount orphaned downloads, $libraryCount missing library entries';
+  }
+
+  @override
+  String get cacheRefreshStats => 'Refresh stats';
+
+  @override
+  String get trackSaveCoverArt => 'Save Cover Art';
+
+  @override
+  String get trackSaveCoverArtSubtitle => 'Save album art as .jpg file';
+
+  @override
+  String get trackSaveLyrics => 'Save Lyrics (.lrc)';
+
+  @override
+  String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
+
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
+  @override
+  String get trackReEnrich => 'Re-enrich Metadata';
+
+  @override
+  String get trackReEnrichSubtitle =>
+      'Re-embed metadata without re-downloading';
+
+  @override
+  String get trackReEnrichOnlineSubtitle =>
+      'Search metadata online and embed into file';
+
+  @override
+  String get trackEditMetadata => 'Edit Metadata';
+
+  @override
+  String trackCoverSaved(String fileName) {
+    return 'Cover art saved to $fileName';
+  }
+
+  @override
+  String get trackCoverNoSource => 'No cover art source available';
+
+  @override
+  String trackLyricsSaved(String fileName) {
+    return 'Lyrics saved to $fileName';
+  }
+
+  @override
+  String get trackReEnrichProgress => 'Re-enriching metadata...';
+
+  @override
+  String get trackReEnrichSearching => 'Searching metadata online...';
+
+  @override
+  String get trackReEnrichSuccess => 'Metadata re-enriched successfully';
+
+  @override
+  String get trackReEnrichFfmpegFailed => 'FFmpeg metadata embed failed';
+
+  @override
+  String trackSaveFailed(String error) {
+    return 'Failed: $error';
+  }
+
+  @override
+  String get trackConvertFormat => 'Convert Format';
+
+  @override
+  String get trackConvertFormatSubtitle => 'Convert to MP3 or Opus';
+
+  @override
+  String get trackConvertTitle => 'Convert Audio';
+
+  @override
+  String get trackConvertTargetFormat => 'Target Format';
+
+  @override
+  String get trackConvertBitrate => 'Bitrate';
+
+  @override
+  String get trackConvertConfirmTitle => 'Confirm Conversion';
+
+  @override
+  String trackConvertConfirmMessage(
+    String sourceFormat,
+    String targetFormat,
+    String bitrate,
+  ) {
+    return 'Convert from $sourceFormat to $targetFormat at $bitrate?\n\nThe original file will be deleted after conversion.';
+  }
+
+  @override
+  String get trackConvertConverting => 'Converting audio...';
+
+  @override
+  String trackConvertSuccess(String format) {
+    return 'Converted to $format successfully';
+  }
+
+  @override
+  String get trackConvertFailed => 'Conversion failed';
 }
@@ -13,11 +13,14 @@ class AppLocalizationsKo extends AppLocalizations {

  @override
  String get appDescription =>
-      'Download Spotify tracks in lossless quality from Tidal, Qobuz, and Amazon Music.';
+      'Spotify 트랙을 Tidal, Qobuz, Amazon Music에서 무손실 음질로 다운로드하세요.';

  @override
  String get navHome => 'Home';

+  @override
+  String get navLibrary => 'Library';
+
  @override
  String get navHistory => 'History';

@@ -31,32 +34,32 @@ class AppLocalizationsKo extends AppLocalizations {
  String get homeTitle => 'Home';

  @override
-  String get homeSearchHint => 'Paste Spotify URL or search...';
+  String get homeSearchHint => 'Spotify URL을 붙여 넣거나 검색';

  @override
  String homeSearchHintExtension(String extensionName) {
-    return 'Search with $extensionName...';
+    return '$extensionName에서 검색';
  }

  @override
-  String get homeSubtitle => 'Paste a Spotify link or search by name';
+  String get homeSubtitle => 'Spotify URL을 붙여 넣거나 검색';

  @override
-  String get homeSupports => 'Supports: Track, Album, Playlist, Artist URLs';
+  String get homeSupports => '지원 항목: 트랙, 앨범, 플레이리스트, 아티스트 URLs';

  @override
-  String get homeRecent => 'Recent';
+  String get homeRecent => '최근 기록';

  @override
-  String get historyTitle => 'History';
+  String get historyTitle => '기록';

  @override
  String historyDownloading(int count) {
-    return 'Downloading ($count)';
+    return '다운로드 중... $count';
  }

  @override
-  String get historyDownloaded => 'Downloaded';
+  String get historyDownloaded => '다운로드 목록';

  @override
  String get historyFilterAll => 'All';
@@ -72,7 +75,7 @@ class AppLocalizationsKo extends AppLocalizations {
    String _temp0 = intl.Intl.pluralLogic(
      count,
      locale: localeName,
-      other: '$count tracks',
+      other: '${count}tracks',
      one: '1 track',
    );
    return '$_temp0';
@@ -242,14 +245,13 @@ class AppLocalizationsKo extends AppLocalizations {
  String get optionsAutoFallback => 'Auto Fallback';

  @override
-  String get optionsAutoFallbackSubtitle =>
-      'Try other services if download fails';
+  String get optionsAutoFallbackSubtitle => '다운로드가 실패한 경우, 다른 서비스로 재시도';

  @override
  String get optionsUseExtensionProviders => 'Use Extension Providers';

  @override
-  String get optionsUseExtensionProvidersOn => 'Extensions will be tried first';
+  String get optionsUseExtensionProvidersOn => '확장 기능을 우선적으로 사용합니다';

  @override
  String get optionsUseExtensionProvidersOff => 'Using built-in providers only';
@@ -340,6 +342,10 @@ class AppLocalizationsKo extends AppLocalizations {
  String get optionsSpotifyWarning =>
      'Spotify requires your own API credentials. Get them free from developer.spotify.com';

+  @override
+  String get optionsSpotifyDeprecationWarning =>
+      'Spotify search will be deprecated on March 3, 2026 due to Spotify API changes. Please switch to Deezer.';
+
  @override
  String get extensionsTitle => 'Extensions';

@@ -450,12 +456,6 @@ class AppLocalizationsKo extends AppLocalizations {
  @override
  String get aboutSupport => 'Support';

-  @override
-  String get aboutBuyMeCoffee => 'Buy me a coffee';
-
-  @override
-  String get aboutBuyMeCoffeeSubtitle => 'Support development on Ko-fi';
-
  @override
  String get aboutApp => 'App';

@@ -488,6 +488,13 @@ class AppLocalizationsKo extends AppLocalizations {
  String get aboutDabMusicDesc =>
      'The best Qobuz streaming API. Hi-Res downloads wouldn\'t be possible without this!';

+  @override
+  String get aboutSpotiSaver => 'SpotiSaver';
+
+  @override
+  String get aboutSpotiSaverDesc =>
+      'Tidal Hi-Res FLAC streaming endpoints. A key piece of the lossless puzzle!';
+
  @override
  String get aboutAppDescription =>
      'Download Spotify tracks in lossless quality from Tidal, Qobuz, and Amazon Music.';
@@ -943,6 +950,11 @@ class AppLocalizationsKo extends AppLocalizations {
    return '\"$trackName\" already downloaded';
  }

+  @override
+  String snackbarAlreadyInLibrary(String trackName) {
+    return '\"$trackName\" already exists in your library';
+  }
+
  @override
  String get snackbarHistoryCleared => 'History cleared';

@@ -1169,6 +1181,13 @@ class AppLocalizationsKo extends AppLocalizations {
    return '$artist - $title';
  }

+  @override
+  String get filenameShowAdvancedTags => 'Show advanced tags';
+
+  @override
+  String get filenameShowAdvancedTagsDescription =>
+      'Enable formatted tags for track padding and date patterns';
+
  @override
  String get folderOrganization => 'Folder Organization';

@@ -1899,6 +1918,10 @@ class AppLocalizationsKo extends AppLocalizations {
  String get qualityNote =>
      'Actual quality depends on track availability from the service';

+  @override
+  String get youtubeQualityNote =>
+      'YouTube provides lossy audio only. Not part of lossless fallback.';
+
  @override
  String get downloadAskBeforeDownload => 'Ask Before Download';

@@ -1911,6 +1934,28 @@ class AppLocalizationsKo extends AppLocalizations {
  @override
  String get downloadAlbumFolderStructure => 'Album Folder Structure';

+  @override
+  String get downloadUseAlbumArtistForFolders => 'Use Album Artist for folders';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersAlbumSubtitle =>
+      'Artist folders use Album Artist when available';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersTrackSubtitle =>
+      'Artist folders use Track Artist only';
+
+  @override
+  String get downloadUsePrimaryArtistOnly => 'Primary artist only for folders';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyEnabled =>
+      'Featured artists removed from folder name (e.g. Justin Bieber, Quavo → Justin Bieber)';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyDisabled =>
+      'Full artist string used for folder name';
+
  @override
  String get downloadSaveFormat => 'Save Format';

@@ -2010,6 +2055,19 @@ class AppLocalizationsKo extends AppLocalizations {
  String get settingsAutoExportFailedSubtitle =>
      'Save failed downloads to TXT file automatically';

+  @override
+  String get settingsDownloadNetwork => 'Download Network';
+
+  @override
+  String get settingsDownloadNetworkAny => 'WiFi + Mobile Data';
+
+  @override
+  String get settingsDownloadNetworkWifiOnly => 'WiFi Only';
+
+  @override
+  String get settingsDownloadNetworkSubtitle =>
+      'Choose which network to use for downloads. When set to WiFi Only, downloads will pause on mobile data.';
+
  @override
  String get queueEmpty => 'No downloads in queue';

@@ -2133,6 +2191,12 @@ class AppLocalizationsKo extends AppLocalizations {
  @override
  String get recentTypePlaylist => 'Playlist';

+  @override
+  String get recentEmpty => 'No recent items yet';
+
+  @override
+  String get recentShowAllDownloads => 'Show All Downloads';
+
  @override
  String recentPlaylistInfo(String name) {
    return 'Playlist: $name';
@@ -2232,4 +2296,649 @@ class AppLocalizationsKo extends AppLocalizations {
  @override
  String get allFilesAccessDisabledMessage =>
      'All Files Access disabled. The app will use limited storage access.';
+
+  @override
+  String get settingsLocalLibrary => 'Local Library';
+
+  @override
+  String get settingsLocalLibrarySubtitle => 'Scan music & detect duplicates';
+
+  @override
+  String get settingsCache => 'Storage & Cache';
+
+  @override
+  String get settingsCacheSubtitle => 'View size and clear cached data';
+
+  @override
+  String get libraryTitle => 'Local Library';
+
+  @override
+  String get libraryStatus => 'Library Status';
+
+  @override
+  String get libraryScanSettings => 'Scan Settings';
+
+  @override
+  String get libraryEnableLocalLibrary => 'Enable Local Library';
+
+  @override
+  String get libraryEnableLocalLibrarySubtitle =>
+      'Scan and track your existing music';
+
+  @override
+  String get libraryFolder => 'Library Folder';
+
+  @override
+  String get libraryFolderHint => 'Tap to select folder';
+
+  @override
+  String get libraryShowDuplicateIndicator => 'Show Duplicate Indicator';
+
+  @override
+  String get libraryShowDuplicateIndicatorSubtitle =>
+      'Show when searching for existing tracks';
+
+  @override
+  String get libraryActions => 'Actions';
+
+  @override
+  String get libraryScan => 'Scan Library';
+
+  @override
+  String get libraryScanSubtitle => 'Scan for audio files';
+
+  @override
+  String get libraryScanSelectFolderFirst => 'Select a folder first';
+
+  @override
+  String get libraryCleanupMissingFiles => 'Cleanup Missing Files';
+
+  @override
+  String get libraryCleanupMissingFilesSubtitle =>
+      'Remove entries for files that no longer exist';
+
+  @override
+  String get libraryClear => 'Clear Library';
+
+  @override
+  String get libraryClearSubtitle => 'Remove all scanned tracks';
+
+  @override
+  String get libraryClearConfirmTitle => 'Clear Library';
+
+  @override
+  String get libraryClearConfirmMessage =>
+      'This will remove all scanned tracks from your library. Your actual music files will not be deleted.';
+
+  @override
+  String get libraryAbout => 'About Local Library';
+
+  @override
+  String get libraryAboutDescription =>
+      'Scans your existing music collection to detect duplicates when downloading. Supports FLAC, M4A, MP3, Opus, and OGG formats. Metadata is read from file tags when available.';
+
+  @override
+  String libraryTracksCount(int count) {
+    return '$count tracks';
+  }
+
+  @override
+  String libraryLastScanned(String time) {
+    return 'Last scanned: $time';
+  }
+
+  @override
+  String get libraryLastScannedNever => 'Never';
+
+  @override
+  String get libraryScanning => 'Scanning...';
+
+  @override
+  String libraryScanProgress(String progress, int total) {
+    return '$progress% of $total files';
+  }
+
+  @override
+  String get libraryInLibrary => 'In Library';
+
+  @override
+  String libraryRemovedMissingFiles(int count) {
+    return 'Removed $count missing files from library';
+  }
+
+  @override
+  String get libraryCleared => 'Library cleared';
+
+  @override
+  String get libraryStorageAccessRequired => 'Storage Access Required';
+
+  @override
+  String get libraryStorageAccessMessage =>
+      'SpotiFLAC needs storage access to scan your music library. Please grant permission in settings.';
+
+  @override
+  String get libraryFolderNotExist => 'Selected folder does not exist';
+
+  @override
+  String get librarySourceDownloaded => 'Downloaded';
+
+  @override
+  String get librarySourceLocal => 'Local';
+
+  @override
+  String get libraryFilterAll => 'All';
+
+  @override
+  String get libraryFilterDownloaded => 'Downloaded';
+
+  @override
+  String get libraryFilterLocal => 'Local';
+
+  @override
+  String get libraryFilterTitle => 'Filters';
+
+  @override
+  String get libraryFilterReset => 'Reset';
+
+  @override
+  String get libraryFilterApply => 'Apply';
+
+  @override
+  String get libraryFilterSource => 'Source';
+
+  @override
+  String get libraryFilterQuality => 'Quality';
+
+  @override
+  String get libraryFilterQualityHiRes => 'Hi-Res (24bit)';
+
+  @override
+  String get libraryFilterQualityCD => 'CD (16bit)';
+
+  @override
+  String get libraryFilterQualityLossy => 'Lossy';
+
+  @override
+  String get libraryFilterFormat => 'Format';
+
+  @override
+  String get libraryFilterDate => 'Date Added';
+
+  @override
+  String get libraryFilterDateToday => 'Today';
+
+  @override
+  String get libraryFilterDateWeek => 'This Week';
+
+  @override
+  String get libraryFilterDateMonth => 'This Month';
+
+  @override
+  String get libraryFilterDateYear => 'This Year';
+
+  @override
+  String get libraryFilterSort => 'Sort';
+
+  @override
+  String get libraryFilterSortLatest => 'Latest';
+
+  @override
+  String get libraryFilterSortOldest => 'Oldest';
+
+  @override
+  String libraryFilterActive(int count) {
+    return '$count filter(s) active';
+  }
+
+  @override
+  String get timeJustNow => 'Just now';
+
+  @override
+  String timeMinutesAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count minutes ago',
+      one: '1 minute ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String timeHoursAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count hours ago',
+      one: '1 hour ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String get storageSwitchTitle => 'Switch Storage Mode';
+
+  @override
+  String get storageSwitchToSafTitle => 'Switch to SAF Storage?';
+
+  @override
+  String get storageSwitchToAppTitle => 'Switch to App Storage?';
+
+  @override
+  String get storageSwitchToSafMessage =>
+      'Your existing downloads will remain in the current location and stay accessible.\n\nNew downloads will be saved to your selected SAF folder.';
+
+  @override
+  String get storageSwitchToAppMessage =>
+      'Your existing downloads will remain in the current SAF location and stay accessible.\n\nNew downloads will be saved to Music/SpotiFLAC folder.';
+
+  @override
+  String get storageSwitchExistingDownloads => 'Existing Downloads';
+
+  @override
+  String storageSwitchExistingDownloadsInfo(int count, String mode) {
+    return '$count tracks in $mode storage';
+  }
+
+  @override
+  String get storageSwitchNewDownloads => 'New Downloads';
+
+  @override
+  String storageSwitchNewDownloadsLocation(String location) {
+    return 'Will be saved to: $location';
+  }
+
+  @override
+  String get storageSwitchContinue => 'Continue';
+
+  @override
+  String get storageSwitchSelectFolder => 'Select SAF Folder';
+
+  @override
+  String get storageAppStorage => 'App Storage';
+
+  @override
+  String get storageSafStorage => 'SAF Storage';
+
+  @override
+  String storageModeBadge(String mode) {
+    return 'Storage: $mode';
+  }
+
+  @override
+  String get storageStatsTitle => 'Storage Statistics';
+
+  @override
+  String storageStatsAppCount(int count) {
+    return '$count tracks in App Storage';
+  }
+
+  @override
+  String storageStatsSafCount(int count) {
+    return '$count tracks in SAF Storage';
+  }
+
+  @override
+  String get storageModeInfo => 'Your files are stored in multiple locations';
+
+  @override
+  String get tutorialWelcomeTitle => 'Welcome to SpotiFLAC!';
+
+  @override
+  String get tutorialWelcomeDesc =>
+      'Let\'s learn how to download your favorite music in lossless quality. This quick tutorial will show you the basics.';
+
+  @override
+  String get tutorialWelcomeTip1 =>
+      'Download music from Spotify, Deezer, or paste any supported URL';
+
+  @override
+  String get tutorialWelcomeTip2 =>
+      'Get FLAC quality audio from Tidal, Qobuz, or Amazon Music';
+
+  @override
+  String get tutorialWelcomeTip3 =>
+      'Automatic metadata, cover art, and lyrics embedding';
+
+  @override
+  String get tutorialSearchTitle => 'Finding Music';
+
+  @override
+  String get tutorialSearchDesc =>
+      'There are two easy ways to find music you want to download.';
+
+  @override
+  String get tutorialSearchTip1 =>
+      'Paste a Spotify or Deezer URL directly in the search box';
+
+  @override
+  String get tutorialSearchTip2 =>
+      'Or type the song name, artist, or album to search';
+
+  @override
+  String get tutorialSearchTip3 =>
+      'Supports tracks, albums, playlists, and artist pages';
+
+  @override
+  String get tutorialDownloadTitle => 'Downloading Music';
+
+  @override
+  String get tutorialDownloadDesc =>
+      'Downloading music is simple and fast. Here\'s how it works.';
+
+  @override
+  String get tutorialDownloadTip1 =>
+      'Tap the download button next to any track to start downloading';
+
+  @override
+  String get tutorialDownloadTip2 =>
+      'Choose your preferred quality (FLAC, Hi-Res, or MP3)';
+
+  @override
+  String get tutorialDownloadTip3 =>
+      'Download entire albums or playlists with one tap';
+
+  @override
+  String get tutorialLibraryTitle => 'Your Library';
+
+  @override
+  String get tutorialLibraryDesc =>
+      'All your downloaded music is organized in the Library tab.';
+
+  @override
+  String get tutorialLibraryTip1 =>
+      'View download progress and queue in the Library tab';
+
+  @override
+  String get tutorialLibraryTip2 =>
+      'Tap any track to play it with your music player';
+
+  @override
+  String get tutorialLibraryTip3 =>
+      'Switch between list and grid view for better browsing';
+
+  @override
+  String get tutorialExtensionsTitle => 'Extensions';
+
+  @override
+  String get tutorialExtensionsDesc =>
+      'Extend the app\'s capabilities with community extensions.';
+
+  @override
+  String get tutorialExtensionsTip1 =>
+      'Browse the Store tab to discover useful extensions';
+
+  @override
+  String get tutorialExtensionsTip2 =>
+      'Add new download providers or search sources';
+
+  @override
+  String get tutorialExtensionsTip3 =>
+      'Get lyrics, enhanced metadata, and more features';
+
+  @override
+  String get tutorialSettingsTitle => 'Customize Your Experience';
+
+  @override
+  String get tutorialSettingsDesc =>
+      'Personalize the app in Settings to match your preferences.';
+
+  @override
+  String get tutorialSettingsTip1 =>
+      'Change download location and folder organization';
+
+  @override
+  String get tutorialSettingsTip2 =>
+      'Set default audio quality and format preferences';
+
+  @override
+  String get tutorialSettingsTip3 => 'Customize app theme and appearance';
+
+  @override
+  String get tutorialReadyMessage =>
+      'You\'re all set! Start downloading your favorite music now.';
+
+  @override
+  String get tutorialExample => 'EXAMPLE';
+
+  @override
+  String get libraryForceFullScan => 'Force Full Scan';
+
+  @override
+  String get libraryForceFullScanSubtitle => 'Rescan all files, ignoring cache';
+
+  @override
+  String get cleanupOrphanedDownloads => 'Cleanup Orphaned Downloads';
+
+  @override
+  String get cleanupOrphanedDownloadsSubtitle =>
+      'Remove history entries for files that no longer exist';
+
+  @override
+  String cleanupOrphanedDownloadsResult(int count) {
+    return 'Removed $count orphaned entries from history';
+  }
+
+  @override
+  String get cleanupOrphanedDownloadsNone => 'No orphaned entries found';
+
+  @override
+  String get cacheTitle => 'Storage & Cache';
+
+  @override
+  String get cacheSummaryTitle => 'Cache overview';
+
+  @override
+  String get cacheSummarySubtitle =>
+      'Clearing cache will not remove downloaded music files.';
+
+  @override
+  String cacheEstimatedTotal(String size) {
+    return 'Estimated cache usage: $size';
+  }
+
+  @override
+  String get cacheSectionStorage => 'Cached Data';
+
+  @override
+  String get cacheSectionMaintenance => 'Maintenance';
+
+  @override
+  String get cacheAppDirectory => 'App cache directory';
+
+  @override
+  String get cacheAppDirectoryDesc =>
+      'HTTP responses, WebView data, and other temporary app data.';
+
+  @override
+  String get cacheTempDirectory => 'Temporary directory';
+
+  @override
+  String get cacheTempDirectoryDesc =>
+      'Temporary files from downloads and audio conversion.';
+
+  @override
+  String get cacheCoverImage => 'Cover image cache';
+
+  @override
+  String get cacheCoverImageDesc =>
+      'Downloaded album and track cover art. Will re-download when viewed.';
+
+  @override
+  String get cacheLibraryCover => 'Library cover cache';
+
+  @override
+  String get cacheLibraryCoverDesc =>
+      'Cover art extracted from local music files. Will re-extract on next scan.';
+
+  @override
+  String get cacheExploreFeed => 'Explore feed cache';
+
+  @override
+  String get cacheExploreFeedDesc =>
+      'Explore tab content (new releases, trending). Will refresh on next visit.';
+
+  @override
+  String get cacheTrackLookup => 'Track lookup cache';
+
+  @override
+  String get cacheTrackLookupDesc =>
+      'Spotify/Deezer track ID lookups. Clearing may slow next few searches.';
+
+  @override
+  String get cacheCleanupUnusedDesc =>
+      'Remove orphaned download history and library entries for missing files.';
+
+  @override
+  String get cacheNoData => 'No cached data';
+
+  @override
+  String cacheSizeWithFiles(String size, int count) {
+    return '$size in $count files';
+  }
+
+  @override
+  String cacheSizeOnly(String size) {
+    return '$size';
+  }
+
+  @override
+  String cacheEntries(int count) {
+    return '$count entries';
+  }
+
+  @override
+  String cacheClearSuccess(String target) {
+    return 'Cleared: $target';
+  }
+
+  @override
+  String get cacheClearConfirmTitle => 'Clear cache?';
+
+  @override
+  String cacheClearConfirmMessage(String target) {
+    return 'This will clear cached data for $target. Downloaded music files will not be deleted.';
+  }
+
+  @override
+  String get cacheClearAllConfirmTitle => 'Clear all cache?';
+
+  @override
+  String get cacheClearAllConfirmMessage =>
+      'This will clear all cache categories on this page. Downloaded music files will not be deleted.';
+
+  @override
+  String get cacheClearAll => 'Clear all cache';
+
+  @override
+  String get cacheCleanupUnused => 'Cleanup unused data';
+
+  @override
+  String get cacheCleanupUnusedSubtitle =>
+      'Remove orphaned download history and missing library entries';
+
+  @override
+  String cacheCleanupResult(int downloadCount, int libraryCount) {
+    return 'Cleanup completed: $downloadCount orphaned downloads, $libraryCount missing library entries';
+  }
+
+  @override
+  String get cacheRefreshStats => 'Refresh stats';
+
+  @override
+  String get trackSaveCoverArt => 'Save Cover Art';
+
+  @override
+  String get trackSaveCoverArtSubtitle => 'Save album art as .jpg file';
+
+  @override
+  String get trackSaveLyrics => 'Save Lyrics (.lrc)';
+
+  @override
+  String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
+
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
+  @override
+  String get trackReEnrich => 'Re-enrich Metadata';
+
+  @override
+  String get trackReEnrichSubtitle =>
+      'Re-embed metadata without re-downloading';
+
+  @override
+  String get trackReEnrichOnlineSubtitle =>
+      'Search metadata online and embed into file';
+
+  @override
+  String get trackEditMetadata => 'Edit Metadata';
+
+  @override
+  String trackCoverSaved(String fileName) {
+    return 'Cover art saved to $fileName';
+  }
+
+  @override
+  String get trackCoverNoSource => 'No cover art source available';
+
+  @override
+  String trackLyricsSaved(String fileName) {
+    return 'Lyrics saved to $fileName';
+  }
+
+  @override
+  String get trackReEnrichProgress => 'Re-enriching metadata...';
+
+  @override
+  String get trackReEnrichSearching => 'Searching metadata online...';
+
+  @override
+  String get trackReEnrichSuccess => 'Metadata re-enriched successfully';
+
+  @override
+  String get trackReEnrichFfmpegFailed => 'FFmpeg metadata embed failed';
+
+  @override
+  String trackSaveFailed(String error) {
+    return 'Failed: $error';
+  }
+
+  @override
+  String get trackConvertFormat => 'Convert Format';
+
+  @override
+  String get trackConvertFormatSubtitle => 'Convert to MP3 or Opus';
+
+  @override
+  String get trackConvertTitle => 'Convert Audio';
+
+  @override
+  String get trackConvertTargetFormat => 'Target Format';
+
+  @override
+  String get trackConvertBitrate => 'Bitrate';
+
+  @override
+  String get trackConvertConfirmTitle => 'Confirm Conversion';
+
+  @override
+  String trackConvertConfirmMessage(
+    String sourceFormat,
+    String targetFormat,
+    String bitrate,
+  ) {
+    return 'Convert from $sourceFormat to $targetFormat at $bitrate?\n\nThe original file will be deleted after conversion.';
+  }
+
+  @override
+  String get trackConvertConverting => 'Converting audio...';
+
+  @override
+  String trackConvertSuccess(String format) {
+    return 'Converted to $format successfully';
+  }
+
+  @override
+  String get trackConvertFailed => 'Conversion failed';
 }
@@ -18,6 +18,9 @@ class AppLocalizationsNl extends AppLocalizations {
  @override
  String get navHome => 'Home';

+  @override
+  String get navLibrary => 'Library';
+
  @override
  String get navHistory => 'History';

@@ -340,6 +343,10 @@ class AppLocalizationsNl extends AppLocalizations {
  String get optionsSpotifyWarning =>
      'Spotify requires your own API credentials. Get them free from developer.spotify.com';

+  @override
+  String get optionsSpotifyDeprecationWarning =>
+      'Spotify search will be deprecated on March 3, 2026 due to Spotify API changes. Please switch to Deezer.';
+
  @override
  String get extensionsTitle => 'Extensions';

@@ -450,12 +457,6 @@ class AppLocalizationsNl extends AppLocalizations {
  @override
  String get aboutSupport => 'Support';

-  @override
-  String get aboutBuyMeCoffee => 'Buy me a coffee';
-
-  @override
-  String get aboutBuyMeCoffeeSubtitle => 'Support development on Ko-fi';
-
  @override
  String get aboutApp => 'App';

@@ -488,6 +489,13 @@ class AppLocalizationsNl extends AppLocalizations {
  String get aboutDabMusicDesc =>
      'The best Qobuz streaming API. Hi-Res downloads wouldn\'t be possible without this!';

+  @override
+  String get aboutSpotiSaver => 'SpotiSaver';
+
+  @override
+  String get aboutSpotiSaverDesc =>
+      'Tidal Hi-Res FLAC streaming endpoints. A key piece of the lossless puzzle!';
+
  @override
  String get aboutAppDescription =>
      'Download Spotify tracks in lossless quality from Tidal, Qobuz, and Amazon Music.';
@@ -943,6 +951,11 @@ class AppLocalizationsNl extends AppLocalizations {
    return '\"$trackName\" already downloaded';
  }

+  @override
+  String snackbarAlreadyInLibrary(String trackName) {
+    return '\"$trackName\" already exists in your library';
+  }
+
  @override
  String get snackbarHistoryCleared => 'History cleared';

@@ -1169,6 +1182,13 @@ class AppLocalizationsNl extends AppLocalizations {
    return '$artist - $title';
  }

+  @override
+  String get filenameShowAdvancedTags => 'Show advanced tags';
+
+  @override
+  String get filenameShowAdvancedTagsDescription =>
+      'Enable formatted tags for track padding and date patterns';
+
  @override
  String get folderOrganization => 'Folder Organization';

@@ -1899,6 +1919,10 @@ class AppLocalizationsNl extends AppLocalizations {
  String get qualityNote =>
      'Actual quality depends on track availability from the service';

+  @override
+  String get youtubeQualityNote =>
+      'YouTube provides lossy audio only. Not part of lossless fallback.';
+
  @override
  String get downloadAskBeforeDownload => 'Ask Before Download';

@@ -1911,6 +1935,28 @@ class AppLocalizationsNl extends AppLocalizations {
  @override
  String get downloadAlbumFolderStructure => 'Album Folder Structure';

+  @override
+  String get downloadUseAlbumArtistForFolders => 'Use Album Artist for folders';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersAlbumSubtitle =>
+      'Artist folders use Album Artist when available';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersTrackSubtitle =>
+      'Artist folders use Track Artist only';
+
+  @override
+  String get downloadUsePrimaryArtistOnly => 'Primary artist only for folders';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyEnabled =>
+      'Featured artists removed from folder name (e.g. Justin Bieber, Quavo → Justin Bieber)';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyDisabled =>
+      'Full artist string used for folder name';
+
  @override
  String get downloadSaveFormat => 'Save Format';

@@ -2010,6 +2056,19 @@ class AppLocalizationsNl extends AppLocalizations {
  String get settingsAutoExportFailedSubtitle =>
      'Save failed downloads to TXT file automatically';

+  @override
+  String get settingsDownloadNetwork => 'Download Network';
+
+  @override
+  String get settingsDownloadNetworkAny => 'WiFi + Mobile Data';
+
+  @override
+  String get settingsDownloadNetworkWifiOnly => 'WiFi Only';
+
+  @override
+  String get settingsDownloadNetworkSubtitle =>
+      'Choose which network to use for downloads. When set to WiFi Only, downloads will pause on mobile data.';
+
  @override
  String get queueEmpty => 'No downloads in queue';

@@ -2133,6 +2192,12 @@ class AppLocalizationsNl extends AppLocalizations {
  @override
  String get recentTypePlaylist => 'Playlist';

+  @override
+  String get recentEmpty => 'No recent items yet';
+
+  @override
+  String get recentShowAllDownloads => 'Show All Downloads';
+
  @override
  String recentPlaylistInfo(String name) {
    return 'Playlist: $name';
@@ -2232,4 +2297,649 @@ class AppLocalizationsNl extends AppLocalizations {
  @override
  String get allFilesAccessDisabledMessage =>
      'All Files Access disabled. The app will use limited storage access.';
+
+  @override
+  String get settingsLocalLibrary => 'Local Library';
+
+  @override
+  String get settingsLocalLibrarySubtitle => 'Scan music & detect duplicates';
+
+  @override
+  String get settingsCache => 'Storage & Cache';
+
+  @override
+  String get settingsCacheSubtitle => 'View size and clear cached data';
+
+  @override
+  String get libraryTitle => 'Local Library';
+
+  @override
+  String get libraryStatus => 'Library Status';
+
+  @override
+  String get libraryScanSettings => 'Scan Settings';
+
+  @override
+  String get libraryEnableLocalLibrary => 'Enable Local Library';
+
+  @override
+  String get libraryEnableLocalLibrarySubtitle =>
+      'Scan and track your existing music';
+
+  @override
+  String get libraryFolder => 'Library Folder';
+
+  @override
+  String get libraryFolderHint => 'Tap to select folder';
+
+  @override
+  String get libraryShowDuplicateIndicator => 'Show Duplicate Indicator';
+
+  @override
+  String get libraryShowDuplicateIndicatorSubtitle =>
+      'Show when searching for existing tracks';
+
+  @override
+  String get libraryActions => 'Actions';
+
+  @override
+  String get libraryScan => 'Scan Library';
+
+  @override
+  String get libraryScanSubtitle => 'Scan for audio files';
+
+  @override
+  String get libraryScanSelectFolderFirst => 'Select a folder first';
+
+  @override
+  String get libraryCleanupMissingFiles => 'Cleanup Missing Files';
+
+  @override
+  String get libraryCleanupMissingFilesSubtitle =>
+      'Remove entries for files that no longer exist';
+
+  @override
+  String get libraryClear => 'Clear Library';
+
+  @override
+  String get libraryClearSubtitle => 'Remove all scanned tracks';
+
+  @override
+  String get libraryClearConfirmTitle => 'Clear Library';
+
+  @override
+  String get libraryClearConfirmMessage =>
+      'This will remove all scanned tracks from your library. Your actual music files will not be deleted.';
+
+  @override
+  String get libraryAbout => 'About Local Library';
+
+  @override
+  String get libraryAboutDescription =>
+      'Scans your existing music collection to detect duplicates when downloading. Supports FLAC, M4A, MP3, Opus, and OGG formats. Metadata is read from file tags when available.';
+
+  @override
+  String libraryTracksCount(int count) {
+    return '$count tracks';
+  }
+
+  @override
+  String libraryLastScanned(String time) {
+    return 'Last scanned: $time';
+  }
+
+  @override
+  String get libraryLastScannedNever => 'Never';
+
+  @override
+  String get libraryScanning => 'Scanning...';
+
+  @override
+  String libraryScanProgress(String progress, int total) {
+    return '$progress% of $total files';
+  }
+
+  @override
+  String get libraryInLibrary => 'In Library';
+
+  @override
+  String libraryRemovedMissingFiles(int count) {
+    return 'Removed $count missing files from library';
+  }
+
+  @override
+  String get libraryCleared => 'Library cleared';
+
+  @override
+  String get libraryStorageAccessRequired => 'Storage Access Required';
+
+  @override
+  String get libraryStorageAccessMessage =>
+      'SpotiFLAC needs storage access to scan your music library. Please grant permission in settings.';
+
+  @override
+  String get libraryFolderNotExist => 'Selected folder does not exist';
+
+  @override
+  String get librarySourceDownloaded => 'Downloaded';
+
+  @override
+  String get librarySourceLocal => 'Local';
+
+  @override
+  String get libraryFilterAll => 'All';
+
+  @override
+  String get libraryFilterDownloaded => 'Downloaded';
+
+  @override
+  String get libraryFilterLocal => 'Local';
+
+  @override
+  String get libraryFilterTitle => 'Filters';
+
+  @override
+  String get libraryFilterReset => 'Reset';
+
+  @override
+  String get libraryFilterApply => 'Apply';
+
+  @override
+  String get libraryFilterSource => 'Source';
+
+  @override
+  String get libraryFilterQuality => 'Quality';
+
+  @override
+  String get libraryFilterQualityHiRes => 'Hi-Res (24bit)';
+
+  @override
+  String get libraryFilterQualityCD => 'CD (16bit)';
+
+  @override
+  String get libraryFilterQualityLossy => 'Lossy';
+
+  @override
+  String get libraryFilterFormat => 'Format';
+
+  @override
+  String get libraryFilterDate => 'Date Added';
+
+  @override
+  String get libraryFilterDateToday => 'Today';
+
+  @override
+  String get libraryFilterDateWeek => 'This Week';
+
+  @override
+  String get libraryFilterDateMonth => 'This Month';
+
+  @override
+  String get libraryFilterDateYear => 'This Year';
+
+  @override
+  String get libraryFilterSort => 'Sort';
+
+  @override
+  String get libraryFilterSortLatest => 'Latest';
+
+  @override
+  String get libraryFilterSortOldest => 'Oldest';
+
+  @override
+  String libraryFilterActive(int count) {
+    return '$count filter(s) active';
+  }
+
+  @override
+  String get timeJustNow => 'Just now';
+
+  @override
+  String timeMinutesAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count minutes ago',
+      one: '1 minute ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String timeHoursAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count hours ago',
+      one: '1 hour ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String get storageSwitchTitle => 'Switch Storage Mode';
+
+  @override
+  String get storageSwitchToSafTitle => 'Switch to SAF Storage?';
+
+  @override
+  String get storageSwitchToAppTitle => 'Switch to App Storage?';
+
+  @override
+  String get storageSwitchToSafMessage =>
+      'Your existing downloads will remain in the current location and stay accessible.\n\nNew downloads will be saved to your selected SAF folder.';
+
+  @override
+  String get storageSwitchToAppMessage =>
+      'Your existing downloads will remain in the current SAF location and stay accessible.\n\nNew downloads will be saved to Music/SpotiFLAC folder.';
+
+  @override
+  String get storageSwitchExistingDownloads => 'Existing Downloads';
+
+  @override
+  String storageSwitchExistingDownloadsInfo(int count, String mode) {
+    return '$count tracks in $mode storage';
+  }
+
+  @override
+  String get storageSwitchNewDownloads => 'New Downloads';
+
+  @override
+  String storageSwitchNewDownloadsLocation(String location) {
+    return 'Will be saved to: $location';
+  }
+
+  @override
+  String get storageSwitchContinue => 'Continue';
+
+  @override
+  String get storageSwitchSelectFolder => 'Select SAF Folder';
+
+  @override
+  String get storageAppStorage => 'App Storage';
+
+  @override
+  String get storageSafStorage => 'SAF Storage';
+
+  @override
+  String storageModeBadge(String mode) {
+    return 'Storage: $mode';
+  }
+
+  @override
+  String get storageStatsTitle => 'Storage Statistics';
+
+  @override
+  String storageStatsAppCount(int count) {
+    return '$count tracks in App Storage';
+  }
+
+  @override
+  String storageStatsSafCount(int count) {
+    return '$count tracks in SAF Storage';
+  }
+
+  @override
+  String get storageModeInfo => 'Your files are stored in multiple locations';
+
+  @override
+  String get tutorialWelcomeTitle => 'Welcome to SpotiFLAC!';
+
+  @override
+  String get tutorialWelcomeDesc =>
+      'Let\'s learn how to download your favorite music in lossless quality. This quick tutorial will show you the basics.';
+
+  @override
+  String get tutorialWelcomeTip1 =>
+      'Download music from Spotify, Deezer, or paste any supported URL';
+
+  @override
+  String get tutorialWelcomeTip2 =>
+      'Get FLAC quality audio from Tidal, Qobuz, or Amazon Music';
+
+  @override
+  String get tutorialWelcomeTip3 =>
+      'Automatic metadata, cover art, and lyrics embedding';
+
+  @override
+  String get tutorialSearchTitle => 'Finding Music';
+
+  @override
+  String get tutorialSearchDesc =>
+      'There are two easy ways to find music you want to download.';
+
+  @override
+  String get tutorialSearchTip1 =>
+      'Paste a Spotify or Deezer URL directly in the search box';
+
+  @override
+  String get tutorialSearchTip2 =>
+      'Or type the song name, artist, or album to search';
+
+  @override
+  String get tutorialSearchTip3 =>
+      'Supports tracks, albums, playlists, and artist pages';
+
+  @override
+  String get tutorialDownloadTitle => 'Downloading Music';
+
+  @override
+  String get tutorialDownloadDesc =>
+      'Downloading music is simple and fast. Here\'s how it works.';
+
+  @override
+  String get tutorialDownloadTip1 =>
+      'Tap the download button next to any track to start downloading';
+
+  @override
+  String get tutorialDownloadTip2 =>
+      'Choose your preferred quality (FLAC, Hi-Res, or MP3)';
+
+  @override
+  String get tutorialDownloadTip3 =>
+      'Download entire albums or playlists with one tap';
+
+  @override
+  String get tutorialLibraryTitle => 'Your Library';
+
+  @override
+  String get tutorialLibraryDesc =>
+      'All your downloaded music is organized in the Library tab.';
+
+  @override
+  String get tutorialLibraryTip1 =>
+      'View download progress and queue in the Library tab';
+
+  @override
+  String get tutorialLibraryTip2 =>
+      'Tap any track to play it with your music player';
+
+  @override
+  String get tutorialLibraryTip3 =>
+      'Switch between list and grid view for better browsing';
+
+  @override
+  String get tutorialExtensionsTitle => 'Extensions';
+
+  @override
+  String get tutorialExtensionsDesc =>
+      'Extend the app\'s capabilities with community extensions.';
+
+  @override
+  String get tutorialExtensionsTip1 =>
+      'Browse the Store tab to discover useful extensions';
+
+  @override
+  String get tutorialExtensionsTip2 =>
+      'Add new download providers or search sources';
+
+  @override
+  String get tutorialExtensionsTip3 =>
+      'Get lyrics, enhanced metadata, and more features';
+
+  @override
+  String get tutorialSettingsTitle => 'Customize Your Experience';
+
+  @override
+  String get tutorialSettingsDesc =>
+      'Personalize the app in Settings to match your preferences.';
+
+  @override
+  String get tutorialSettingsTip1 =>
+      'Change download location and folder organization';
+
+  @override
+  String get tutorialSettingsTip2 =>
+      'Set default audio quality and format preferences';
+
+  @override
+  String get tutorialSettingsTip3 => 'Customize app theme and appearance';
+
+  @override
+  String get tutorialReadyMessage =>
+      'You\'re all set! Start downloading your favorite music now.';
+
+  @override
+  String get tutorialExample => 'EXAMPLE';
+
+  @override
+  String get libraryForceFullScan => 'Force Full Scan';
+
+  @override
+  String get libraryForceFullScanSubtitle => 'Rescan all files, ignoring cache';
+
+  @override
+  String get cleanupOrphanedDownloads => 'Cleanup Orphaned Downloads';
+
+  @override
+  String get cleanupOrphanedDownloadsSubtitle =>
+      'Remove history entries for files that no longer exist';
+
+  @override
+  String cleanupOrphanedDownloadsResult(int count) {
+    return 'Removed $count orphaned entries from history';
+  }
+
+  @override
+  String get cleanupOrphanedDownloadsNone => 'No orphaned entries found';
+
+  @override
+  String get cacheTitle => 'Storage & Cache';
+
+  @override
+  String get cacheSummaryTitle => 'Cache overview';
+
+  @override
+  String get cacheSummarySubtitle =>
+      'Clearing cache will not remove downloaded music files.';
+
+  @override
+  String cacheEstimatedTotal(String size) {
+    return 'Estimated cache usage: $size';
+  }
+
+  @override
+  String get cacheSectionStorage => 'Cached Data';
+
+  @override
+  String get cacheSectionMaintenance => 'Maintenance';
+
+  @override
+  String get cacheAppDirectory => 'App cache directory';
+
+  @override
+  String get cacheAppDirectoryDesc =>
+      'HTTP responses, WebView data, and other temporary app data.';
+
+  @override
+  String get cacheTempDirectory => 'Temporary directory';
+
+  @override
+  String get cacheTempDirectoryDesc =>
+      'Temporary files from downloads and audio conversion.';
+
+  @override
+  String get cacheCoverImage => 'Cover image cache';
+
+  @override
+  String get cacheCoverImageDesc =>
+      'Downloaded album and track cover art. Will re-download when viewed.';
+
+  @override
+  String get cacheLibraryCover => 'Library cover cache';
+
+  @override
+  String get cacheLibraryCoverDesc =>
+      'Cover art extracted from local music files. Will re-extract on next scan.';
+
+  @override
+  String get cacheExploreFeed => 'Explore feed cache';
+
+  @override
+  String get cacheExploreFeedDesc =>
+      'Explore tab content (new releases, trending). Will refresh on next visit.';
+
+  @override
+  String get cacheTrackLookup => 'Track lookup cache';
+
+  @override
+  String get cacheTrackLookupDesc =>
+      'Spotify/Deezer track ID lookups. Clearing may slow next few searches.';
+
+  @override
+  String get cacheCleanupUnusedDesc =>
+      'Remove orphaned download history and library entries for missing files.';
+
+  @override
+  String get cacheNoData => 'No cached data';
+
+  @override
+  String cacheSizeWithFiles(String size, int count) {
+    return '$size in $count files';
+  }
+
+  @override
+  String cacheSizeOnly(String size) {
+    return '$size';
+  }
+
+  @override
+  String cacheEntries(int count) {
+    return '$count entries';
+  }
+
+  @override
+  String cacheClearSuccess(String target) {
+    return 'Cleared: $target';
+  }
+
+  @override
+  String get cacheClearConfirmTitle => 'Clear cache?';
+
+  @override
+  String cacheClearConfirmMessage(String target) {
+    return 'This will clear cached data for $target. Downloaded music files will not be deleted.';
+  }
+
+  @override
+  String get cacheClearAllConfirmTitle => 'Clear all cache?';
+
+  @override
+  String get cacheClearAllConfirmMessage =>
+      'This will clear all cache categories on this page. Downloaded music files will not be deleted.';
+
+  @override
+  String get cacheClearAll => 'Clear all cache';
+
+  @override
+  String get cacheCleanupUnused => 'Cleanup unused data';
+
+  @override
+  String get cacheCleanupUnusedSubtitle =>
+      'Remove orphaned download history and missing library entries';
+
+  @override
+  String cacheCleanupResult(int downloadCount, int libraryCount) {
+    return 'Cleanup completed: $downloadCount orphaned downloads, $libraryCount missing library entries';
+  }
+
+  @override
+  String get cacheRefreshStats => 'Refresh stats';
+
+  @override
+  String get trackSaveCoverArt => 'Save Cover Art';
+
+  @override
+  String get trackSaveCoverArtSubtitle => 'Save album art as .jpg file';
+
+  @override
+  String get trackSaveLyrics => 'Save Lyrics (.lrc)';
+
+  @override
+  String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
+
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
+  @override
+  String get trackReEnrich => 'Re-enrich Metadata';
+
+  @override
+  String get trackReEnrichSubtitle =>
+      'Re-embed metadata without re-downloading';
+
+  @override
+  String get trackReEnrichOnlineSubtitle =>
+      'Search metadata online and embed into file';
+
+  @override
+  String get trackEditMetadata => 'Edit Metadata';
+
+  @override
+  String trackCoverSaved(String fileName) {
+    return 'Cover art saved to $fileName';
+  }
+
+  @override
+  String get trackCoverNoSource => 'No cover art source available';
+
+  @override
+  String trackLyricsSaved(String fileName) {
+    return 'Lyrics saved to $fileName';
+  }
+
+  @override
+  String get trackReEnrichProgress => 'Re-enriching metadata...';
+
+  @override
+  String get trackReEnrichSearching => 'Searching metadata online...';
+
+  @override
+  String get trackReEnrichSuccess => 'Metadata re-enriched successfully';
+
+  @override
+  String get trackReEnrichFfmpegFailed => 'FFmpeg metadata embed failed';
+
+  @override
+  String trackSaveFailed(String error) {
+    return 'Failed: $error';
+  }
+
+  @override
+  String get trackConvertFormat => 'Convert Format';
+
+  @override
+  String get trackConvertFormatSubtitle => 'Convert to MP3 or Opus';
+
+  @override
+  String get trackConvertTitle => 'Convert Audio';
+
+  @override
+  String get trackConvertTargetFormat => 'Target Format';
+
+  @override
+  String get trackConvertBitrate => 'Bitrate';
+
+  @override
+  String get trackConvertConfirmTitle => 'Confirm Conversion';
+
+  @override
+  String trackConvertConfirmMessage(
+    String sourceFormat,
+    String targetFormat,
+    String bitrate,
+  ) {
+    return 'Convert from $sourceFormat to $targetFormat at $bitrate?\n\nThe original file will be deleted after conversion.';
+  }
+
+  @override
+  String get trackConvertConverting => 'Converting audio...';
+
+  @override
+  String trackConvertSuccess(String format) {
+    return 'Converted to $format successfully';
+  }
+
+  @override
+  String get trackConvertFailed => 'Conversion failed';
 }
@@ -18,6 +18,9 @@ class AppLocalizationsTr extends AppLocalizations {
  @override
  String get navHome => 'Ara';

+  @override
+  String get navLibrary => 'Library';
+
  @override
  String get navHistory => 'Geçmiş';

@@ -345,6 +348,10 @@ class AppLocalizationsTr extends AppLocalizations {
  String get optionsSpotifyWarning =>
      'Spotify\'ın senin API kimlik bilgilerine ihtiyacı var. Onları developer.spotify.com\'dan alabilirsin';

+  @override
+  String get optionsSpotifyDeprecationWarning =>
+      'Spotify search will be deprecated on March 3, 2026 due to Spotify API changes. Please switch to Deezer.';
+
  @override
  String get extensionsTitle => 'Eklentiler';

@@ -457,12 +464,6 @@ class AppLocalizationsTr extends AppLocalizations {
  @override
  String get aboutSupport => 'Destek';

-  @override
-  String get aboutBuyMeCoffee => 'Bana bir kahve ısmarla';
-
-  @override
-  String get aboutBuyMeCoffeeSubtitle => 'Ko-fi üzerinden uygulamayı destekle';
-
  @override
  String get aboutApp => 'Uygulama';

@@ -495,6 +496,13 @@ class AppLocalizationsTr extends AppLocalizations {
  String get aboutDabMusicDesc =>
      'En iyi Qobuz streaming API\'ı. Yüksek kalite indirmeler bunun sayesinde!';

+  @override
+  String get aboutSpotiSaver => 'SpotiSaver';
+
+  @override
+  String get aboutSpotiSaverDesc =>
+      'Tidal Hi-Res FLAC streaming endpoints. A key piece of the lossless puzzle!';
+
  @override
  String get aboutAppDescription =>
      'Spotify şarkılarını Tidal, Qobuz ve Amazon Music\'den yüksek kalitede indir.';
@@ -950,6 +958,11 @@ class AppLocalizationsTr extends AppLocalizations {
    return '\"$trackName\" zaten indirilmiş';
  }

+  @override
+  String snackbarAlreadyInLibrary(String trackName) {
+    return '\"$trackName\" already exists in your library';
+  }
+
  @override
  String get snackbarHistoryCleared => 'Geçmiş temizlendi';

@@ -1176,6 +1189,13 @@ class AppLocalizationsTr extends AppLocalizations {
    return '$artist - $title';
  }

+  @override
+  String get filenameShowAdvancedTags => 'Show advanced tags';
+
+  @override
+  String get filenameShowAdvancedTagsDescription =>
+      'Enable formatted tags for track padding and date patterns';
+
  @override
  String get folderOrganization => 'Klasör Organizasyonu';

@@ -1914,6 +1934,10 @@ class AppLocalizationsTr extends AppLocalizations {
  String get qualityNote =>
      'Actual quality depends on track availability from the service';

+  @override
+  String get youtubeQualityNote =>
+      'YouTube provides lossy audio only. Not part of lossless fallback.';
+
  @override
  String get downloadAskBeforeDownload => 'Ask Before Download';

@@ -1926,6 +1950,28 @@ class AppLocalizationsTr extends AppLocalizations {
  @override
  String get downloadAlbumFolderStructure => 'Album Folder Structure';

+  @override
+  String get downloadUseAlbumArtistForFolders => 'Use Album Artist for folders';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersAlbumSubtitle =>
+      'Artist folders use Album Artist when available';
+
+  @override
+  String get downloadUseAlbumArtistForFoldersTrackSubtitle =>
+      'Artist folders use Track Artist only';
+
+  @override
+  String get downloadUsePrimaryArtistOnly => 'Primary artist only for folders';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyEnabled =>
+      'Featured artists removed from folder name (e.g. Justin Bieber, Quavo → Justin Bieber)';
+
+  @override
+  String get downloadUsePrimaryArtistOnlyDisabled =>
+      'Full artist string used for folder name';
+
  @override
  String get downloadSaveFormat => 'Save Format';

@@ -2025,6 +2071,19 @@ class AppLocalizationsTr extends AppLocalizations {
  String get settingsAutoExportFailedSubtitle =>
      'Save failed downloads to TXT file automatically';

+  @override
+  String get settingsDownloadNetwork => 'Download Network';
+
+  @override
+  String get settingsDownloadNetworkAny => 'WiFi + Mobile Data';
+
+  @override
+  String get settingsDownloadNetworkWifiOnly => 'WiFi Only';
+
+  @override
+  String get settingsDownloadNetworkSubtitle =>
+      'Choose which network to use for downloads. When set to WiFi Only, downloads will pause on mobile data.';
+
  @override
  String get queueEmpty => 'No downloads in queue';

@@ -2148,6 +2207,12 @@ class AppLocalizationsTr extends AppLocalizations {
  @override
  String get recentTypePlaylist => 'Playlist';

+  @override
+  String get recentEmpty => 'No recent items yet';
+
+  @override
+  String get recentShowAllDownloads => 'Show All Downloads';
+
  @override
  String recentPlaylistInfo(String name) {
    return 'Playlist: $name';
@@ -2247,4 +2312,649 @@ class AppLocalizationsTr extends AppLocalizations {
  @override
  String get allFilesAccessDisabledMessage =>
      'All Files Access disabled. The app will use limited storage access.';
+
+  @override
+  String get settingsLocalLibrary => 'Local Library';
+
+  @override
+  String get settingsLocalLibrarySubtitle => 'Scan music & detect duplicates';
+
+  @override
+  String get settingsCache => 'Storage & Cache';
+
+  @override
+  String get settingsCacheSubtitle => 'View size and clear cached data';
+
+  @override
+  String get libraryTitle => 'Local Library';
+
+  @override
+  String get libraryStatus => 'Library Status';
+
+  @override
+  String get libraryScanSettings => 'Scan Settings';
+
+  @override
+  String get libraryEnableLocalLibrary => 'Enable Local Library';
+
+  @override
+  String get libraryEnableLocalLibrarySubtitle =>
+      'Scan and track your existing music';
+
+  @override
+  String get libraryFolder => 'Library Folder';
+
+  @override
+  String get libraryFolderHint => 'Tap to select folder';
+
+  @override
+  String get libraryShowDuplicateIndicator => 'Show Duplicate Indicator';
+
+  @override
+  String get libraryShowDuplicateIndicatorSubtitle =>
+      'Show when searching for existing tracks';
+
+  @override
+  String get libraryActions => 'Actions';
+
+  @override
+  String get libraryScan => 'Scan Library';
+
+  @override
+  String get libraryScanSubtitle => 'Scan for audio files';
+
+  @override
+  String get libraryScanSelectFolderFirst => 'Select a folder first';
+
+  @override
+  String get libraryCleanupMissingFiles => 'Cleanup Missing Files';
+
+  @override
+  String get libraryCleanupMissingFilesSubtitle =>
+      'Remove entries for files that no longer exist';
+
+  @override
+  String get libraryClear => 'Clear Library';
+
+  @override
+  String get libraryClearSubtitle => 'Remove all scanned tracks';
+
+  @override
+  String get libraryClearConfirmTitle => 'Clear Library';
+
+  @override
+  String get libraryClearConfirmMessage =>
+      'This will remove all scanned tracks from your library. Your actual music files will not be deleted.';
+
+  @override
+  String get libraryAbout => 'About Local Library';
+
+  @override
+  String get libraryAboutDescription =>
+      'Scans your existing music collection to detect duplicates when downloading. Supports FLAC, M4A, MP3, Opus, and OGG formats. Metadata is read from file tags when available.';
+
+  @override
+  String libraryTracksCount(int count) {
+    return '$count tracks';
+  }
+
+  @override
+  String libraryLastScanned(String time) {
+    return 'Last scanned: $time';
+  }
+
+  @override
+  String get libraryLastScannedNever => 'Never';
+
+  @override
+  String get libraryScanning => 'Scanning...';
+
+  @override
+  String libraryScanProgress(String progress, int total) {
+    return '$progress% of $total files';
+  }
+
+  @override
+  String get libraryInLibrary => 'In Library';
+
+  @override
+  String libraryRemovedMissingFiles(int count) {
+    return 'Removed $count missing files from library';
+  }
+
+  @override
+  String get libraryCleared => 'Library cleared';
+
+  @override
+  String get libraryStorageAccessRequired => 'Storage Access Required';
+
+  @override
+  String get libraryStorageAccessMessage =>
+      'SpotiFLAC needs storage access to scan your music library. Please grant permission in settings.';
+
+  @override
+  String get libraryFolderNotExist => 'Selected folder does not exist';
+
+  @override
+  String get librarySourceDownloaded => 'Downloaded';
+
+  @override
+  String get librarySourceLocal => 'Local';
+
+  @override
+  String get libraryFilterAll => 'All';
+
+  @override
+  String get libraryFilterDownloaded => 'Downloaded';
+
+  @override
+  String get libraryFilterLocal => 'Local';
+
+  @override
+  String get libraryFilterTitle => 'Filters';
+
+  @override
+  String get libraryFilterReset => 'Reset';
+
+  @override
+  String get libraryFilterApply => 'Apply';
+
+  @override
+  String get libraryFilterSource => 'Source';
+
+  @override
+  String get libraryFilterQuality => 'Quality';
+
+  @override
+  String get libraryFilterQualityHiRes => 'Hi-Res (24bit)';
+
+  @override
+  String get libraryFilterQualityCD => 'CD (16bit)';
+
+  @override
+  String get libraryFilterQualityLossy => 'Lossy';
+
+  @override
+  String get libraryFilterFormat => 'Format';
+
+  @override
+  String get libraryFilterDate => 'Date Added';
+
+  @override
+  String get libraryFilterDateToday => 'Today';
+
+  @override
+  String get libraryFilterDateWeek => 'This Week';
+
+  @override
+  String get libraryFilterDateMonth => 'This Month';
+
+  @override
+  String get libraryFilterDateYear => 'This Year';
+
+  @override
+  String get libraryFilterSort => 'Sort';
+
+  @override
+  String get libraryFilterSortLatest => 'Latest';
+
+  @override
+  String get libraryFilterSortOldest => 'Oldest';
+
+  @override
+  String libraryFilterActive(int count) {
+    return '$count filter(s) active';
+  }
+
+  @override
+  String get timeJustNow => 'Just now';
+
+  @override
+  String timeMinutesAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count minutes ago',
+      one: '1 minute ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String timeHoursAgo(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count hours ago',
+      one: '1 hour ago',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String get storageSwitchTitle => 'Switch Storage Mode';
+
+  @override
+  String get storageSwitchToSafTitle => 'Switch to SAF Storage?';
+
+  @override
+  String get storageSwitchToAppTitle => 'Switch to App Storage?';
+
+  @override
+  String get storageSwitchToSafMessage =>
+      'Your existing downloads will remain in the current location and stay accessible.\n\nNew downloads will be saved to your selected SAF folder.';
+
+  @override
+  String get storageSwitchToAppMessage =>
+      'Your existing downloads will remain in the current SAF location and stay accessible.\n\nNew downloads will be saved to Music/SpotiFLAC folder.';
+
+  @override
+  String get storageSwitchExistingDownloads => 'Existing Downloads';
+
+  @override
+  String storageSwitchExistingDownloadsInfo(int count, String mode) {
+    return '$count tracks in $mode storage';
+  }
+
+  @override
+  String get storageSwitchNewDownloads => 'New Downloads';
+
+  @override
+  String storageSwitchNewDownloadsLocation(String location) {
+    return 'Will be saved to: $location';
+  }
+
+  @override
+  String get storageSwitchContinue => 'Continue';
+
+  @override
+  String get storageSwitchSelectFolder => 'Select SAF Folder';
+
+  @override
+  String get storageAppStorage => 'App Storage';
+
+  @override
+  String get storageSafStorage => 'SAF Storage';
+
+  @override
+  String storageModeBadge(String mode) {
+    return 'Storage: $mode';
+  }
+
+  @override
+  String get storageStatsTitle => 'Storage Statistics';
+
+  @override
+  String storageStatsAppCount(int count) {
+    return '$count tracks in App Storage';
+  }
+
+  @override
+  String storageStatsSafCount(int count) {
+    return '$count tracks in SAF Storage';
+  }
+
+  @override
+  String get storageModeInfo => 'Your files are stored in multiple locations';
+
+  @override
+  String get tutorialWelcomeTitle => 'Welcome to SpotiFLAC!';
+
+  @override
+  String get tutorialWelcomeDesc =>
+      'Let\'s learn how to download your favorite music in lossless quality. This quick tutorial will show you the basics.';
+
+  @override
+  String get tutorialWelcomeTip1 =>
+      'Download music from Spotify, Deezer, or paste any supported URL';
+
+  @override
+  String get tutorialWelcomeTip2 =>
+      'Get FLAC quality audio from Tidal, Qobuz, or Amazon Music';
+
+  @override
+  String get tutorialWelcomeTip3 =>
+      'Automatic metadata, cover art, and lyrics embedding';
+
+  @override
+  String get tutorialSearchTitle => 'Finding Music';
+
+  @override
+  String get tutorialSearchDesc =>
+      'There are two easy ways to find music you want to download.';
+
+  @override
+  String get tutorialSearchTip1 =>
+      'Paste a Spotify or Deezer URL directly in the search box';
+
+  @override
+  String get tutorialSearchTip2 =>
+      'Or type the song name, artist, or album to search';
+
+  @override
+  String get tutorialSearchTip3 =>
+      'Supports tracks, albums, playlists, and artist pages';
+
+  @override
+  String get tutorialDownloadTitle => 'Downloading Music';
+
+  @override
+  String get tutorialDownloadDesc =>
+      'Downloading music is simple and fast. Here\'s how it works.';
+
+  @override
+  String get tutorialDownloadTip1 =>
+      'Tap the download button next to any track to start downloading';
+
+  @override
+  String get tutorialDownloadTip2 =>
+      'Choose your preferred quality (FLAC, Hi-Res, or MP3)';
+
+  @override
+  String get tutorialDownloadTip3 =>
+      'Download entire albums or playlists with one tap';
+
+  @override
+  String get tutorialLibraryTitle => 'Your Library';
+
+  @override
+  String get tutorialLibraryDesc =>
+      'All your downloaded music is organized in the Library tab.';
+
+  @override
+  String get tutorialLibraryTip1 =>
+      'View download progress and queue in the Library tab';
+
+  @override
+  String get tutorialLibraryTip2 =>
+      'Tap any track to play it with your music player';
+
+  @override
+  String get tutorialLibraryTip3 =>
+      'Switch between list and grid view for better browsing';
+
+  @override
+  String get tutorialExtensionsTitle => 'Extensions';
+
+  @override
+  String get tutorialExtensionsDesc =>
+      'Extend the app\'s capabilities with community extensions.';
+
+  @override
+  String get tutorialExtensionsTip1 =>
+      'Browse the Store tab to discover useful extensions';
+
+  @override
+  String get tutorialExtensionsTip2 =>
+      'Add new download providers or search sources';
+
+  @override
+  String get tutorialExtensionsTip3 =>
+      'Get lyrics, enhanced metadata, and more features';
+
+  @override
+  String get tutorialSettingsTitle => 'Customize Your Experience';
+
+  @override
+  String get tutorialSettingsDesc =>
+      'Personalize the app in Settings to match your preferences.';
+
+  @override
+  String get tutorialSettingsTip1 =>
+      'Change download location and folder organization';
+
+  @override
+  String get tutorialSettingsTip2 =>
+      'Set default audio quality and format preferences';
+
+  @override
+  String get tutorialSettingsTip3 => 'Customize app theme and appearance';
+
+  @override
+  String get tutorialReadyMessage =>
+      'You\'re all set! Start downloading your favorite music now.';
+
+  @override
+  String get tutorialExample => 'EXAMPLE';
+
+  @override
+  String get libraryForceFullScan => 'Force Full Scan';
+
+  @override
+  String get libraryForceFullScanSubtitle => 'Rescan all files, ignoring cache';
+
+  @override
+  String get cleanupOrphanedDownloads => 'Cleanup Orphaned Downloads';
+
+  @override
+  String get cleanupOrphanedDownloadsSubtitle =>
+      'Remove history entries for files that no longer exist';
+
+  @override
+  String cleanupOrphanedDownloadsResult(int count) {
+    return 'Removed $count orphaned entries from history';
+  }
+
+  @override
+  String get cleanupOrphanedDownloadsNone => 'No orphaned entries found';
+
+  @override
+  String get cacheTitle => 'Storage & Cache';
+
+  @override
+  String get cacheSummaryTitle => 'Cache overview';
+
+  @override
+  String get cacheSummarySubtitle =>
+      'Clearing cache will not remove downloaded music files.';
+
+  @override
+  String cacheEstimatedTotal(String size) {
+    return 'Estimated cache usage: $size';
+  }
+
+  @override
+  String get cacheSectionStorage => 'Cached Data';
+
+  @override
+  String get cacheSectionMaintenance => 'Maintenance';
+
+  @override
+  String get cacheAppDirectory => 'App cache directory';
+
+  @override
+  String get cacheAppDirectoryDesc =>
+      'HTTP responses, WebView data, and other temporary app data.';
+
+  @override
+  String get cacheTempDirectory => 'Temporary directory';
+
+  @override
+  String get cacheTempDirectoryDesc =>
+      'Temporary files from downloads and audio conversion.';
+
+  @override
+  String get cacheCoverImage => 'Cover image cache';
+
+  @override
+  String get cacheCoverImageDesc =>
+      'Downloaded album and track cover art. Will re-download when viewed.';
+
+  @override
+  String get cacheLibraryCover => 'Library cover cache';
+
+  @override
+  String get cacheLibraryCoverDesc =>
+      'Cover art extracted from local music files. Will re-extract on next scan.';
+
+  @override
+  String get cacheExploreFeed => 'Explore feed cache';
+
+  @override
+  String get cacheExploreFeedDesc =>
+      'Explore tab content (new releases, trending). Will refresh on next visit.';
+
+  @override
+  String get cacheTrackLookup => 'Track lookup cache';
+
+  @override
+  String get cacheTrackLookupDesc =>
+      'Spotify/Deezer track ID lookups. Clearing may slow next few searches.';
+
+  @override
+  String get cacheCleanupUnusedDesc =>
+      'Remove orphaned download history and library entries for missing files.';
+
+  @override
+  String get cacheNoData => 'No cached data';
+
+  @override
+  String cacheSizeWithFiles(String size, int count) {
+    return '$size in $count files';
+  }
+
+  @override
+  String cacheSizeOnly(String size) {
+    return '$size';
+  }
+
+  @override
+  String cacheEntries(int count) {
+    return '$count entries';
+  }
+
+  @override
+  String cacheClearSuccess(String target) {
+    return 'Cleared: $target';
+  }
+
+  @override
+  String get cacheClearConfirmTitle => 'Clear cache?';
+
+  @override
+  String cacheClearConfirmMessage(String target) {
+    return 'This will clear cached data for $target. Downloaded music files will not be deleted.';
+  }
+
+  @override
+  String get cacheClearAllConfirmTitle => 'Clear all cache?';
+
+  @override
+  String get cacheClearAllConfirmMessage =>
+      'This will clear all cache categories on this page. Downloaded music files will not be deleted.';
+
+  @override
+  String get cacheClearAll => 'Clear all cache';
+
+  @override
+  String get cacheCleanupUnused => 'Cleanup unused data';
+
+  @override
+  String get cacheCleanupUnusedSubtitle =>
+      'Remove orphaned download history and missing library entries';
+
+  @override
+  String cacheCleanupResult(int downloadCount, int libraryCount) {
+    return 'Cleanup completed: $downloadCount orphaned downloads, $libraryCount missing library entries';
+  }
+
+  @override
+  String get cacheRefreshStats => 'Refresh stats';
+
+  @override
+  String get trackSaveCoverArt => 'Save Cover Art';
+
+  @override
+  String get trackSaveCoverArtSubtitle => 'Save album art as .jpg file';
+
+  @override
+  String get trackSaveLyrics => 'Save Lyrics (.lrc)';
+
+  @override
+  String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
+
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
+  @override
+  String get trackReEnrich => 'Re-enrich Metadata';
+
+  @override
+  String get trackReEnrichSubtitle =>
+      'Re-embed metadata without re-downloading';
+
+  @override
+  String get trackReEnrichOnlineSubtitle =>
+      'Search metadata online and embed into file';
+
+  @override
+  String get trackEditMetadata => 'Edit Metadata';
+
+  @override
+  String trackCoverSaved(String fileName) {
+    return 'Cover art saved to $fileName';
+  }
+
+  @override
+  String get trackCoverNoSource => 'No cover art source available';
+
+  @override
+  String trackLyricsSaved(String fileName) {
+    return 'Lyrics saved to $fileName';
+  }
+
+  @override
+  String get trackReEnrichProgress => 'Re-enriching metadata...';
+
+  @override
+  String get trackReEnrichSearching => 'Searching metadata online...';
+
+  @override
+  String get trackReEnrichSuccess => 'Metadata re-enriched successfully';
+
+  @override
+  String get trackReEnrichFfmpegFailed => 'FFmpeg metadata embed failed';
+
+  @override
+  String trackSaveFailed(String error) {
+    return 'Failed: $error';
+  }
+
+  @override
+  String get trackConvertFormat => 'Convert Format';
+
+  @override
+  String get trackConvertFormatSubtitle => 'Convert to MP3 or Opus';
+
+  @override
+  String get trackConvertTitle => 'Convert Audio';
+
+  @override
+  String get trackConvertTargetFormat => 'Target Format';
+
+  @override
+  String get trackConvertBitrate => 'Bitrate';
+
+  @override
+  String get trackConvertConfirmTitle => 'Confirm Conversion';
+
+  @override
+  String trackConvertConfirmMessage(
+    String sourceFormat,
+    String targetFormat,
+    String bitrate,
+  ) {
+    return 'Convert from $sourceFormat to $targetFormat at $bitrate?\n\nThe original file will be deleted after conversion.';
+  }
+
+  @override
+  String get trackConvertConverting => 'Converting audio...';
+
+  @override
+  String trackConvertSuccess(String format) {
+    return 'Converted to $format successfully';
+  }
+
+  @override
+  String get trackConvertFailed => 'Conversion failed';
 }
@@ -9,8 +9,10 @@

  "navHome": "Home",
  "@navHome": {"description": "Bottom navigation - Home tab"},
+  "navLibrary": "Library",
+  "@navLibrary": {"description": "Bottom navigation - Library tab"},
  "navHistory": "History",
-  "@navHistory": {"description": "Bottom navigation - History tab"},
+  "@navHistory": {"description": "Bottom navigation - History tab (legacy)"},
  "navSettings": "Settings",
  "@navSettings": {"description": "Bottom navigation - Settings tab"},
  "navStore": "Store",
@@ -239,6 +241,8 @@
  "@optionsSpotifyCredentialsRequired": {"description": "Prompt to set up credentials"},
  "optionsSpotifyWarning": "Spotify requires your own API credentials. Get them free from developer.spotify.com",
  "@optionsSpotifyWarning": {"description": "Info about Spotify API requirement"},
+  "optionsSpotifyDeprecationWarning": "Spotify search will be deprecated on March 3, 2026 due to Spotify API changes. Please switch to Deezer.",
+  "@optionsSpotifyDeprecationWarning": {"description": "Warning about Spotify API deprecation"},

  "extensionsTitle": "Extensions",
  "@extensionsTitle": {"description": "Extensions page title"},
@@ -322,10 +326,6 @@
  "@aboutSocial": {"description": "Section for social links"},
  "aboutSupport": "Support",
  "@aboutSupport": {"description": "Section for support/donation links"},
-  "aboutBuyMeCoffee": "Buy me a coffee",
-  "@aboutBuyMeCoffee": {"description": "Donation link"},
-  "aboutBuyMeCoffeeSubtitle": "Support development on Ko-fi",
-  "@aboutBuyMeCoffeeSubtitle": {"description": "Subtitle for donation"},
  "aboutApp": "App",
  "@aboutApp": {"description": "Section for app info"},
  "aboutVersion": "Version",
@@ -344,6 +344,10 @@
  "@aboutDabMusic": {"description": "Name of Qobuz API service - DO NOT TRANSLATE"},
  "aboutDabMusicDesc": "The best Qobuz streaming API. Hi-Res downloads wouldn't be possible without this!",
  "@aboutDabMusicDesc": {"description": "Credit for DAB Music API"},
+  "aboutSpotiSaver": "SpotiSaver",
+  "@aboutSpotiSaver": {"description": "Name of SpotiSaver API service - DO NOT TRANSLATE"},
+  "aboutSpotiSaverDesc": "Tidal Hi-Res FLAC streaming endpoints. A key piece of the lossless puzzle!",
+  "@aboutSpotiSaverDesc": {"description": "Credit for SpotiSaver API"},
  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal, Qobuz, and Amazon Music.",
  "@aboutAppDescription": {"description": "App description in header card"},

@@ -670,6 +674,13 @@
      "trackName": {"type": "String"}
    }
  },
+  "snackbarAlreadyInLibrary": "\"{trackName}\" already exists in your library",
+  "@snackbarAlreadyInLibrary": {
+    "description": "Snackbar - track already exists in local library",
+    "placeholders": {
+      "trackName": {"type": "String"}
+    }
+  },
  "snackbarHistoryCleared": "History cleared",
  "@snackbarHistoryCleared": {"description": "Snackbar - history deleted"},
  "snackbarCredentialsSaved": "Credentials saved",
@@ -863,6 +874,14 @@
  "@filenameAvailablePlaceholders": {"description": "Label for placeholder list"},
  "filenameHint": "{artist} - {title}",
  "@filenameHint": {"description": "Default filename format hint"},
+  "filenameShowAdvancedTags": "Show advanced tags",
+  "@filenameShowAdvancedTags": {
+    "description": "Toggle label for showing advanced filename tags"
+  },
+  "filenameShowAdvancedTagsDescription": "Enable formatted tags for track padding and date patterns",
+  "@filenameShowAdvancedTagsDescription": {
+    "description": "Description for advanced filename tag toggle"
+  },

  "folderOrganization": "Folder Organization",
  "@folderOrganization": {"description": "Setting title - folder structure"},
@@ -1399,6 +1418,8 @@
  "@lossyFormatOpusSubtitle": {"description": "Opus format description"},
  "qualityNote": "Actual quality depends on track availability from the service",
  "@qualityNote": {"description": "Note about quality availability"},
+  "youtubeQualityNote": "YouTube provides lossy audio only. Not part of lossless fallback.",
+  "@youtubeQualityNote": {"description": "Note for YouTube service explaining lossy-only quality"},

  "downloadAskBeforeDownload": "Ask Before Download",
  "@downloadAskBeforeDownload": {"description": "Setting - show quality picker"},
@@ -1408,6 +1429,18 @@
  "@downloadSeparateSinglesFolder": {"description": "Setting - separate folder for singles"},
  "downloadAlbumFolderStructure": "Album Folder Structure",
  "@downloadAlbumFolderStructure": {"description": "Setting - album folder organization"},
+  "downloadUseAlbumArtistForFolders": "Use Album Artist for folders",
+  "@downloadUseAlbumArtistForFolders": {"description": "Setting - choose whether artist folders use Album Artist or Track Artist"},
+  "downloadUseAlbumArtistForFoldersAlbumSubtitle": "Artist folders use Album Artist when available",
+  "@downloadUseAlbumArtistForFoldersAlbumSubtitle": {"description": "Subtitle when Album Artist is used for folder naming"},
+  "downloadUseAlbumArtistForFoldersTrackSubtitle": "Artist folders use Track Artist only",
+  "@downloadUseAlbumArtistForFoldersTrackSubtitle": {"description": "Subtitle when Track Artist is used for folder naming"},
+  "downloadUsePrimaryArtistOnly": "Primary artist only for folders",
+  "@downloadUsePrimaryArtistOnly": {"description": "Setting - strip featured artists from folder name"},
+  "downloadUsePrimaryArtistOnlyEnabled": "Featured artists removed from folder name (e.g. Justin Bieber, Quavo → Justin Bieber)",
+  "@downloadUsePrimaryArtistOnlyEnabled": {"description": "Subtitle when primary artist only is enabled"},
+  "downloadUsePrimaryArtistOnlyDisabled": "Full artist string used for folder name",
+  "@downloadUsePrimaryArtistOnlyDisabled": {"description": "Subtitle when primary artist only is disabled"},
  "downloadSaveFormat": "Save Format",
  "@downloadSaveFormat": {"description": "Setting - output file format"},
  "downloadSelectService": "Select Service",
@@ -1476,6 +1509,16 @@
  "@settingsAutoExportFailed": {"description": "Setting toggle for auto-export"},
  "settingsAutoExportFailedSubtitle": "Save failed downloads to TXT file automatically",
  "@settingsAutoExportFailedSubtitle": {"description": "Subtitle for auto-export setting"},
+
+  "settingsDownloadNetwork": "Download Network",
+  "@settingsDownloadNetwork": {"description": "Setting for network type preference"},
+  "settingsDownloadNetworkAny": "WiFi + Mobile Data",
+  "@settingsDownloadNetworkAny": {"description": "Network option - use any connection"},
+  "settingsDownloadNetworkWifiOnly": "WiFi Only",
+  "@settingsDownloadNetworkWifiOnly": {"description": "Network option - only use WiFi"},
+  "settingsDownloadNetworkSubtitle": "Choose which network to use for downloads. When set to WiFi Only, downloads will pause on mobile data.",
+  "@settingsDownloadNetworkSubtitle": {"description": "Subtitle explaining network preference"},
+
  "queueEmpty": "No downloads in queue",
  "@queueEmpty": {"description": "Empty queue state title"},
  "queueEmptySubtitle": "Add tracks from the home screen",
@@ -1571,6 +1614,12 @@
  "@recentTypeSong": {"description": "Recent access item type - song/track"},
  "recentTypePlaylist": "Playlist",
  "@recentTypePlaylist": {"description": "Recent access item type - playlist"},
+  "recentEmpty": "No recent items yet",
+  "@recentEmpty": {"description": "Empty state text for recent access list"},
+  "recentShowAllDownloads": "Show All Downloads",
+  "@recentShowAllDownloads": {
+    "description": "Button label to unhide hidden downloads in recent access"
+  },

  "recentPlaylistInfo": "Playlist: {name}",
  "@recentPlaylistInfo": {
@@ -1675,5 +1724,508 @@
  "allFilesAccessDeniedMessage": "Permission was denied. Please enable 'All files access' manually in system settings.",
  "@allFilesAccessDeniedMessage": {"description": "Message when permission is permanently denied"},
  "allFilesAccessDisabledMessage": "All Files Access disabled. The app will use limited storage access.",
-  "@allFilesAccessDisabledMessage": {"description": "Snackbar message when user disables all files access"}
+  "@allFilesAccessDisabledMessage": {"description": "Snackbar message when user disables all files access"},
+
+  "settingsLocalLibrary": "Local Library",
+  "@settingsLocalLibrary": {"description": "Settings menu item - local library"},
+  "settingsLocalLibrarySubtitle": "Scan music & detect duplicates",
+  "@settingsLocalLibrarySubtitle": {"description": "Subtitle for local library settings"},
+  "settingsCache": "Storage & Cache",
+  "@settingsCache": {"description": "Settings menu item - cache management"},
+  "settingsCacheSubtitle": "View size and clear cached data",
+  "@settingsCacheSubtitle": {"description": "Subtitle for cache management menu"},
+  "libraryTitle": "Local Library",
+  "@libraryTitle": {"description": "Library settings page title"},
+  "libraryStatus": "Library Status",
+  "@libraryStatus": {"description": "Section header for library status"},
+  "libraryScanSettings": "Scan Settings",
+  "@libraryScanSettings": {"description": "Section header for scan settings"},
+  "libraryEnableLocalLibrary": "Enable Local Library",
+  "@libraryEnableLocalLibrary": {"description": "Toggle to enable library scanning"},
+  "libraryEnableLocalLibrarySubtitle": "Scan and track your existing music",
+  "@libraryEnableLocalLibrarySubtitle": {"description": "Subtitle for enable toggle"},
+  "libraryFolder": "Library Folder",
+  "@libraryFolder": {"description": "Folder selection setting"},
+  "libraryFolderHint": "Tap to select folder",
+  "@libraryFolderHint": {"description": "Placeholder when no folder selected"},
+  "libraryShowDuplicateIndicator": "Show Duplicate Indicator",
+  "@libraryShowDuplicateIndicator": {"description": "Toggle for duplicate indicator in search"},
+  "libraryShowDuplicateIndicatorSubtitle": "Show when searching for existing tracks",
+  "@libraryShowDuplicateIndicatorSubtitle": {"description": "Subtitle for duplicate indicator toggle"},
+  "libraryActions": "Actions",
+  "@libraryActions": {"description": "Section header for library actions"},
+  "libraryScan": "Scan Library",
+  "@libraryScan": {"description": "Button to start library scan"},
+  "libraryScanSubtitle": "Scan for audio files",
+  "@libraryScanSubtitle": {"description": "Subtitle for scan button"},
+  "libraryScanSelectFolderFirst": "Select a folder first",
+  "@libraryScanSelectFolderFirst": {"description": "Message when trying to scan without folder"},
+  "libraryCleanupMissingFiles": "Cleanup Missing Files",
+  "@libraryCleanupMissingFiles": {"description": "Button to remove entries for missing files"},
+  "libraryCleanupMissingFilesSubtitle": "Remove entries for files that no longer exist",
+  "@libraryCleanupMissingFilesSubtitle": {"description": "Subtitle for cleanup button"},
+  "libraryClear": "Clear Library",
+  "@libraryClear": {"description": "Button to clear all library entries"},
+  "libraryClearSubtitle": "Remove all scanned tracks",
+  "@libraryClearSubtitle": {"description": "Subtitle for clear button"},
+  "libraryClearConfirmTitle": "Clear Library",
+  "@libraryClearConfirmTitle": {"description": "Dialog title for clear confirmation"},
+  "libraryClearConfirmMessage": "This will remove all scanned tracks from your library. Your actual music files will not be deleted.",
+  "@libraryClearConfirmMessage": {"description": "Dialog message for clear confirmation"},
+  "libraryAbout": "About Local Library",
+  "@libraryAbout": {"description": "Section header for about info"},
+  "libraryAboutDescription": "Scans your existing music collection to detect duplicates when downloading. Supports FLAC, M4A, MP3, Opus, and OGG formats. Metadata is read from file tags when available.",
+  "@libraryAboutDescription": {"description": "Description of local library feature"},
+  "libraryTracksCount": "{count} tracks",
+  "@libraryTracksCount": {
+    "description": "Track count in library",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+  "libraryLastScanned": "Last scanned: {time}",
+  "@libraryLastScanned": {
+    "description": "Last scan time display",
+    "placeholders": {
+      "time": {"type": "String"}
+    }
+  },
+  "libraryLastScannedNever": "Never",
+  "@libraryLastScannedNever": {"description": "Shown when library has never been scanned"},
+  "libraryScanning": "Scanning...",
+  "@libraryScanning": {"description": "Status during scan"},
+  "libraryScanProgress": "{progress}% of {total} files",
+  "@libraryScanProgress": {
+    "description": "Scan progress display",
+    "placeholders": {
+      "progress": {"type": "String"},
+      "total": {"type": "int"}
+    }
+  },
+  "libraryInLibrary": "In Library",
+  "@libraryInLibrary": {"description": "Badge shown on tracks that exist in local library"},
+  "libraryRemovedMissingFiles": "Removed {count} missing files from library",
+  "@libraryRemovedMissingFiles": {
+    "description": "Snackbar after cleanup",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+  "libraryCleared": "Library cleared",
+  "@libraryCleared": {"description": "Snackbar after clearing library"},
+  "libraryStorageAccessRequired": "Storage Access Required",
+  "@libraryStorageAccessRequired": {"description": "Dialog title for storage permission"},
+  "libraryStorageAccessMessage": "SpotiFLAC needs storage access to scan your music library. Please grant permission in settings.",
+  "@libraryStorageAccessMessage": {"description": "Dialog message for storage permission"},
+  "libraryFolderNotExist": "Selected folder does not exist",
+  "@libraryFolderNotExist": {"description": "Error when folder doesn't exist"},
+  "librarySourceDownloaded": "Downloaded",
+  "@librarySourceDownloaded": {"description": "Badge for tracks downloaded via SpotiFLAC"},
+  "librarySourceLocal": "Local",
+  "@librarySourceLocal": {"description": "Badge for tracks from local library scan"},
+  "libraryFilterAll": "All",
+  "@libraryFilterAll": {"description": "Filter chip - show all library items"},
+  "libraryFilterDownloaded": "Downloaded",
+  "@libraryFilterDownloaded": {"description": "Filter chip - show only downloaded items"},
+  "libraryFilterLocal": "Local",
+  "@libraryFilterLocal": {"description": "Filter chip - show only local library items"},
+
+  "libraryFilterTitle": "Filters",
+  "@libraryFilterTitle": {"description": "Filter bottom sheet title"},
+  "libraryFilterReset": "Reset",
+  "@libraryFilterReset": {"description": "Reset all filters button"},
+  "libraryFilterApply": "Apply",
+  "@libraryFilterApply": {"description": "Apply filters button"},
+  "libraryFilterSource": "Source",
+  "@libraryFilterSource": {"description": "Filter section - source type"},
+  "libraryFilterQuality": "Quality",
+  "@libraryFilterQuality": {"description": "Filter section - audio quality"},
+  "libraryFilterQualityHiRes": "Hi-Res (24bit)",
+  "@libraryFilterQualityHiRes": {"description": "Filter option - high resolution audio"},
+  "libraryFilterQualityCD": "CD (16bit)",
+  "@libraryFilterQualityCD": {"description": "Filter option - CD quality audio"},
+  "libraryFilterQualityLossy": "Lossy",
+  "@libraryFilterQualityLossy": {"description": "Filter option - lossy compressed audio"},
+  "libraryFilterFormat": "Format",
+  "@libraryFilterFormat": {"description": "Filter section - file format"},
+  "libraryFilterDate": "Date Added",
+  "@libraryFilterDate": {"description": "Filter section - date range"},
+  "libraryFilterDateToday": "Today",
+  "@libraryFilterDateToday": {"description": "Filter option - today only"},
+  "libraryFilterDateWeek": "This Week",
+  "@libraryFilterDateWeek": {"description": "Filter option - this week"},
+  "libraryFilterDateMonth": "This Month",
+  "@libraryFilterDateMonth": {"description": "Filter option - this month"},
+  "libraryFilterDateYear": "This Year",
+  "@libraryFilterDateYear": {"description": "Filter option - this year"},
+  "libraryFilterSort": "Sort",
+  "@libraryFilterSort": {"description": "Filter section - sort order"},
+  "libraryFilterSortLatest": "Latest",
+  "@libraryFilterSortLatest": {"description": "Sort option - newest first"},
+  "libraryFilterSortOldest": "Oldest",
+  "@libraryFilterSortOldest": {"description": "Sort option - oldest first"},
+  "libraryFilterActive": "{count} filter(s) active",
+  "@libraryFilterActive": {
+    "description": "Badge showing number of active filters",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+
+  "timeJustNow": "Just now",
+  "@timeJustNow": {"description": "Relative time - less than a minute ago"},
+  "timeMinutesAgo": "{count, plural, =1{1 minute ago} other{{count} minutes ago}}",
+  "@timeMinutesAgo": {
+    "description": "Relative time - minutes ago",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+  "timeHoursAgo": "{count, plural, =1{1 hour ago} other{{count} hours ago}}",
+  "@timeHoursAgo": {
+    "description": "Relative time - hours ago",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+
+  "storageSwitchTitle": "Switch Storage Mode",
+  "@storageSwitchTitle": {"description": "Dialog title when switching storage mode"},
+  "storageSwitchToSafTitle": "Switch to SAF Storage?",
+  "@storageSwitchToSafTitle": {"description": "Dialog title when switching to SAF"},
+  "storageSwitchToAppTitle": "Switch to App Storage?",
+  "@storageSwitchToAppTitle": {"description": "Dialog title when switching to app storage"},
+  "storageSwitchToSafMessage": "Your existing downloads will remain in the current location and stay accessible.\n\nNew downloads will be saved to your selected SAF folder.",
+  "@storageSwitchToSafMessage": {"description": "Explanation when switching to SAF"},
+  "storageSwitchToAppMessage": "Your existing downloads will remain in the current SAF location and stay accessible.\n\nNew downloads will be saved to Music/SpotiFLAC folder.",
+  "@storageSwitchToAppMessage": {"description": "Explanation when switching to app storage"},
+  "storageSwitchExistingDownloads": "Existing Downloads",
+  "@storageSwitchExistingDownloads": {"description": "Section header for existing downloads info"},
+  "storageSwitchExistingDownloadsInfo": "{count} tracks in {mode} storage",
+  "@storageSwitchExistingDownloadsInfo": {
+    "description": "Info about existing downloads count",
+    "placeholders": {
+      "count": {"type": "int"},
+      "mode": {"type": "String"}
+    }
+  },
+  "storageSwitchNewDownloads": "New Downloads",
+  "@storageSwitchNewDownloads": {"description": "Section header for new downloads info"},
+  "storageSwitchNewDownloadsLocation": "Will be saved to: {location}",
+  "@storageSwitchNewDownloadsLocation": {
+    "description": "Shows where new downloads will go",
+    "placeholders": {
+      "location": {"type": "String"}
+    }
+  },
+  "storageSwitchContinue": "Continue",
+  "@storageSwitchContinue": {"description": "Button to proceed with storage switch"},
+  "storageSwitchSelectFolder": "Select SAF Folder",
+  "@storageSwitchSelectFolder": {"description": "Button to select SAF folder"},
+  "storageAppStorage": "App Storage",
+  "@storageAppStorage": {"description": "Label for app storage mode"},
+  "storageSafStorage": "SAF Storage",
+  "@storageSafStorage": {"description": "Label for SAF storage mode"},
+  "storageModeBadge": "Storage: {mode}",
+  "@storageModeBadge": {
+    "description": "Badge showing storage mode for a track",
+    "placeholders": {
+      "mode": {"type": "String"}
+    }
+  },
+  "storageStatsTitle": "Storage Statistics",
+  "@storageStatsTitle": {"description": "Section title for storage stats"},
+  "storageStatsAppCount": "{count} tracks in App Storage",
+  "@storageStatsAppCount": {
+    "description": "Count of tracks in app storage",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+  "storageStatsSafCount": "{count} tracks in SAF Storage",
+  "@storageStatsSafCount": {
+    "description": "Count of tracks in SAF storage",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+  "storageModeInfo": "Your files are stored in multiple locations",
+  "@storageModeInfo": {"description": "Info when user has files in both storage modes"},
+
+  "tutorialWelcomeTitle": "Welcome to SpotiFLAC!",
+  "@tutorialWelcomeTitle": {"description": "Tutorial welcome page title"},
+  "tutorialWelcomeDesc": "Let's learn how to download your favorite music in lossless quality. This quick tutorial will show you the basics.",
+  "@tutorialWelcomeDesc": {"description": "Tutorial welcome page description"},
+  "tutorialWelcomeTip1": "Download music from Spotify, Deezer, or paste any supported URL",
+  "@tutorialWelcomeTip1": {"description": "Tutorial welcome tip 1"},
+  "tutorialWelcomeTip2": "Get FLAC quality audio from Tidal, Qobuz, or Amazon Music",
+  "@tutorialWelcomeTip2": {"description": "Tutorial welcome tip 2"},
+  "tutorialWelcomeTip3": "Automatic metadata, cover art, and lyrics embedding",
+  "@tutorialWelcomeTip3": {"description": "Tutorial welcome tip 3"},
+
+  "tutorialSearchTitle": "Finding Music",
+  "@tutorialSearchTitle": {"description": "Tutorial search page title"},
+  "tutorialSearchDesc": "There are two easy ways to find music you want to download.",
+  "@tutorialSearchDesc": {"description": "Tutorial search page description"},
+  "tutorialSearchTip1": "Paste a Spotify or Deezer URL directly in the search box",
+  "@tutorialSearchTip1": {"description": "Tutorial search tip 1"},
+  "tutorialSearchTip2": "Or type the song name, artist, or album to search",
+  "@tutorialSearchTip2": {"description": "Tutorial search tip 2"},
+  "tutorialSearchTip3": "Supports tracks, albums, playlists, and artist pages",
+  "@tutorialSearchTip3": {"description": "Tutorial search tip 3"},
+
+  "tutorialDownloadTitle": "Downloading Music",
+  "@tutorialDownloadTitle": {"description": "Tutorial download page title"},
+  "tutorialDownloadDesc": "Downloading music is simple and fast. Here's how it works.",
+  "@tutorialDownloadDesc": {"description": "Tutorial download page description"},
+  "tutorialDownloadTip1": "Tap the download button next to any track to start downloading",
+  "@tutorialDownloadTip1": {"description": "Tutorial download tip 1"},
+  "tutorialDownloadTip2": "Choose your preferred quality (FLAC, Hi-Res, or MP3)",
+  "@tutorialDownloadTip2": {"description": "Tutorial download tip 2"},
+  "tutorialDownloadTip3": "Download entire albums or playlists with one tap",
+  "@tutorialDownloadTip3": {"description": "Tutorial download tip 3"},
+
+  "tutorialLibraryTitle": "Your Library",
+  "@tutorialLibraryTitle": {"description": "Tutorial library page title"},
+  "tutorialLibraryDesc": "All your downloaded music is organized in the Library tab.",
+  "@tutorialLibraryDesc": {"description": "Tutorial library page description"},
+  "tutorialLibraryTip1": "View download progress and queue in the Library tab",
+  "@tutorialLibraryTip1": {"description": "Tutorial library tip 1"},
+  "tutorialLibraryTip2": "Tap any track to play it with your music player",
+  "@tutorialLibraryTip2": {"description": "Tutorial library tip 2"},
+  "tutorialLibraryTip3": "Switch between list and grid view for better browsing",
+  "@tutorialLibraryTip3": {"description": "Tutorial library tip 3"},
+
+  "tutorialExtensionsTitle": "Extensions",
+  "@tutorialExtensionsTitle": {"description": "Tutorial extensions page title"},
+  "tutorialExtensionsDesc": "Extend the app's capabilities with community extensions.",
+  "@tutorialExtensionsDesc": {"description": "Tutorial extensions page description"},
+  "tutorialExtensionsTip1": "Browse the Store tab to discover useful extensions",
+  "@tutorialExtensionsTip1": {"description": "Tutorial extensions tip 1"},
+  "tutorialExtensionsTip2": "Add new download providers or search sources",
+  "@tutorialExtensionsTip2": {"description": "Tutorial extensions tip 2"},
+  "tutorialExtensionsTip3": "Get lyrics, enhanced metadata, and more features",
+  "@tutorialExtensionsTip3": {"description": "Tutorial extensions tip 3"},
+
+  "tutorialSettingsTitle": "Customize Your Experience",
+  "@tutorialSettingsTitle": {"description": "Tutorial settings page title"},
+  "tutorialSettingsDesc": "Personalize the app in Settings to match your preferences.",
+  "@tutorialSettingsDesc": {"description": "Tutorial settings page description"},
+  "tutorialSettingsTip1": "Change download location and folder organization",
+  "@tutorialSettingsTip1": {"description": "Tutorial settings tip 1"},
+  "tutorialSettingsTip2": "Set default audio quality and format preferences",
+  "@tutorialSettingsTip2": {"description": "Tutorial settings tip 2"},
+  "tutorialSettingsTip3": "Customize app theme and appearance",
+  "@tutorialSettingsTip3": {"description": "Tutorial settings tip 3"},
+
+  "tutorialReadyMessage": "You're all set! Start downloading your favorite music now.",
+  "@tutorialReadyMessage": {"description": "Tutorial completion message"},
+  "tutorialExample": "EXAMPLE",
+  "@tutorialExample": {"description": "Example label in tutorial"},
+
+  "libraryForceFullScan": "Force Full Scan",
+  "@libraryForceFullScan": {"description": "Button to force a complete rescan of library"},
+  "libraryForceFullScanSubtitle": "Rescan all files, ignoring cache",
+  "@libraryForceFullScanSubtitle": {"description": "Subtitle for force full scan button"},
+
+  "cleanupOrphanedDownloads": "Cleanup Orphaned Downloads",
+  "@cleanupOrphanedDownloads": {"description": "Button to remove history entries for deleted files"},
+  "cleanupOrphanedDownloadsSubtitle": "Remove history entries for files that no longer exist",
+  "@cleanupOrphanedDownloadsSubtitle": {"description": "Subtitle for orphaned cleanup button"},
+  "cleanupOrphanedDownloadsResult": "Removed {count} orphaned entries from history",
+  "@cleanupOrphanedDownloadsResult": {
+    "description": "Snackbar after orphan cleanup",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+  "cleanupOrphanedDownloadsNone": "No orphaned entries found",
+  "@cleanupOrphanedDownloadsNone": {"description": "Snackbar when no orphans found"},
+
+  "cacheTitle": "Storage & Cache",
+  "@cacheTitle": {"description": "Cache management page title"},
+  "cacheSummaryTitle": "Cache overview",
+  "@cacheSummaryTitle": {"description": "Heading for cache summary card"},
+  "cacheSummarySubtitle": "Clearing cache will not remove downloaded music files.",
+  "@cacheSummarySubtitle": {"description": "Helper text for cache summary card"},
+  "cacheEstimatedTotal": "Estimated cache usage: {size}",
+  "@cacheEstimatedTotal": {
+    "description": "Total cache size shown in summary",
+    "placeholders": {
+      "size": {"type": "String"}
+    }
+  },
+  "cacheSectionStorage": "Cached Data",
+  "@cacheSectionStorage": {"description": "Section header for cache entries"},
+  "cacheSectionMaintenance": "Maintenance",
+  "@cacheSectionMaintenance": {"description": "Section header for cleanup actions"},
+  "cacheAppDirectory": "App cache directory",
+  "@cacheAppDirectory": {"description": "Cache item title for app cache directory"},
+  "cacheAppDirectoryDesc": "HTTP responses, WebView data, and other temporary app data.",
+  "@cacheAppDirectoryDesc": {"description": "Description of what app cache directory contains"},
+  "cacheTempDirectory": "Temporary directory",
+  "@cacheTempDirectory": {"description": "Cache item title for temporary files directory"},
+  "cacheTempDirectoryDesc": "Temporary files from downloads and audio conversion.",
+  "@cacheTempDirectoryDesc": {"description": "Description of what temporary directory contains"},
+  "cacheCoverImage": "Cover image cache",
+  "@cacheCoverImage": {"description": "Cache item title for persistent cover images"},
+  "cacheCoverImageDesc": "Downloaded album and track cover art. Will re-download when viewed.",
+  "@cacheCoverImageDesc": {"description": "Description of what cover image cache contains"},
+  "cacheLibraryCover": "Library cover cache",
+  "@cacheLibraryCover": {"description": "Cache item title for local library cover art images"},
+  "cacheLibraryCoverDesc": "Cover art extracted from local music files. Will re-extract on next scan.",
+  "@cacheLibraryCoverDesc": {"description": "Description of what library cover cache contains"},
+  "cacheExploreFeed": "Explore feed cache",
+  "@cacheExploreFeed": {"description": "Cache item title for explore home feed cache"},
+  "cacheExploreFeedDesc": "Explore tab content (new releases, trending). Will refresh on next visit.",
+  "@cacheExploreFeedDesc": {"description": "Description of what explore feed cache contains"},
+  "cacheTrackLookup": "Track lookup cache",
+  "@cacheTrackLookup": {"description": "Cache item title for track ID lookup cache"},
+  "cacheTrackLookupDesc": "Spotify/Deezer track ID lookups. Clearing may slow next few searches.",
+  "@cacheTrackLookupDesc": {"description": "Description of what track lookup cache contains"},
+  "cacheCleanupUnusedDesc": "Remove orphaned download history and library entries for missing files.",
+  "@cacheCleanupUnusedDesc": {"description": "Description of what cleanup unused data does"},
+  "cacheNoData": "No cached data",
+  "@cacheNoData": {"description": "Label when cache category has no data"},
+  "cacheSizeWithFiles": "{size} in {count} files",
+  "@cacheSizeWithFiles": {
+    "description": "Cache size and file count",
+    "placeholders": {
+      "size": {"type": "String"},
+      "count": {"type": "int"}
+    }
+  },
+  "cacheSizeOnly": "{size}",
+  "@cacheSizeOnly": {
+    "description": "Cache size only",
+    "placeholders": {
+      "size": {"type": "String"}
+    }
+  },
+  "cacheEntries": "{count} entries",
+  "@cacheEntries": {
+    "description": "Track cache entry count",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+  "cacheClearSuccess": "Cleared: {target}",
+  "@cacheClearSuccess": {
+    "description": "Snackbar after clearing selected cache",
+    "placeholders": {
+      "target": {"type": "String"}
+    }
+  },
+  "cacheClearConfirmTitle": "Clear cache?",
+  "@cacheClearConfirmTitle": {"description": "Dialog title before clearing one cache category"},
+  "cacheClearConfirmMessage": "This will clear cached data for {target}. Downloaded music files will not be deleted.",
+  "@cacheClearConfirmMessage": {
+    "description": "Dialog message before clearing selected cache",
+    "placeholders": {
+      "target": {"type": "String"}
+    }
+  },
+  "cacheClearAllConfirmTitle": "Clear all cache?",
+  "@cacheClearAllConfirmTitle": {"description": "Dialog title before clearing all caches"},
+  "cacheClearAllConfirmMessage": "This will clear all cache categories on this page. Downloaded music files will not be deleted.",
+  "@cacheClearAllConfirmMessage": {"description": "Dialog message before clearing all caches"},
+  "cacheClearAll": "Clear all cache",
+  "@cacheClearAll": {"description": "Button label to clear all caches"},
+  "cacheCleanupUnused": "Cleanup unused data",
+  "@cacheCleanupUnused": {"description": "Action title for cleaning unused entries"},
+  "cacheCleanupUnusedSubtitle": "Remove orphaned download history and missing library entries",
+  "@cacheCleanupUnusedSubtitle": {"description": "Subtitle for cleanup unused data action"},
+  "cacheCleanupResult": "Cleanup completed: {downloadCount} orphaned downloads, {libraryCount} missing library entries",
+  "@cacheCleanupResult": {
+    "description": "Snackbar after unused data cleanup",
+    "placeholders": {
+      "downloadCount": {"type": "int"},
+      "libraryCount": {"type": "int"}
+    }
+  },
+  "cacheRefreshStats": "Refresh stats",
+  "@cacheRefreshStats": {"description": "Button label to refresh cache statistics"},
+
+  "trackSaveCoverArt": "Save Cover Art",
+  "@trackSaveCoverArt": {"description": "Menu action - save album cover art as file"},
+  "trackSaveCoverArtSubtitle": "Save album art as .jpg file",
+  "@trackSaveCoverArtSubtitle": {"description": "Subtitle for save cover art action"},
+  "trackSaveLyrics": "Save Lyrics (.lrc)",
+  "@trackSaveLyrics": {"description": "Menu action - save lyrics as .lrc file"},
+  "trackSaveLyricsSubtitle": "Fetch and save lyrics as .lrc file",
+  "@trackSaveLyricsSubtitle": {"description": "Subtitle for save lyrics action"},
+  "trackSaveLyricsProgress": "Saving lyrics...",
+  "@trackSaveLyricsProgress": {"description": "Snackbar while saving lyrics to file"},
+  "trackReEnrich": "Re-enrich Metadata",
+  "@trackReEnrich": {"description": "Menu action - re-embed metadata into audio file"},
+  "trackReEnrichSubtitle": "Re-embed metadata without re-downloading",
+  "@trackReEnrichSubtitle": {"description": "Subtitle for re-enrich metadata action"},
+  "trackReEnrichOnlineSubtitle": "Search metadata online and embed into file",
+  "@trackReEnrichOnlineSubtitle": {"description": "Subtitle for re-enrich metadata action for local items"},
+  "trackEditMetadata": "Edit Metadata",
+  "@trackEditMetadata": {"description": "Menu action - edit embedded metadata"},
+  "trackCoverSaved": "Cover art saved to {fileName}",
+  "@trackCoverSaved": {
+    "description": "Snackbar after cover art saved",
+    "placeholders": {
+      "fileName": {"type": "String"}
+    }
+  },
+  "trackCoverNoSource": "No cover art source available",
+  "@trackCoverNoSource": {"description": "Snackbar when no cover art URL or embedded cover"},
+  "trackLyricsSaved": "Lyrics saved to {fileName}",
+  "@trackLyricsSaved": {
+    "description": "Snackbar after lyrics saved",
+    "placeholders": {
+      "fileName": {"type": "String"}
+    }
+  },
+  "trackReEnrichProgress": "Re-enriching metadata...",
+  "@trackReEnrichProgress": {"description": "Snackbar while re-enriching metadata"},
+  "trackReEnrichSearching": "Searching metadata online...",
+  "@trackReEnrichSearching": {"description": "Snackbar while searching metadata from internet for local items"},
+  "trackReEnrichSuccess": "Metadata re-enriched successfully",
+  "@trackReEnrichSuccess": {"description": "Snackbar after successful re-enrichment"},
+  "trackReEnrichFfmpegFailed": "FFmpeg metadata embed failed",
+  "@trackReEnrichFfmpegFailed": {"description": "Snackbar when FFmpeg embed fails for MP3/Opus"},
+  "trackSaveFailed": "Failed: {error}",
+  "@trackSaveFailed": {
+    "description": "Snackbar when save operation fails",
+    "placeholders": {
+      "error": {"type": "String"}
+    }
+  },
+
+  "trackConvertFormat": "Convert Format",
+  "@trackConvertFormat": {"description": "Menu item - convert audio format"},
+  "trackConvertFormatSubtitle": "Convert to MP3 or Opus",
+  "@trackConvertFormatSubtitle": {"description": "Subtitle for convert format menu item"},
+  "trackConvertTitle": "Convert Audio",
+  "@trackConvertTitle": {"description": "Title of convert bottom sheet"},
+  "trackConvertTargetFormat": "Target Format",
+  "@trackConvertTargetFormat": {"description": "Label for format selection"},
+  "trackConvertBitrate": "Bitrate",
+  "@trackConvertBitrate": {"description": "Label for bitrate selection"},
+  "trackConvertConfirmTitle": "Confirm Conversion",
+  "@trackConvertConfirmTitle": {"description": "Confirmation dialog title"},
+  "trackConvertConfirmMessage": "Convert from {sourceFormat} to {targetFormat} at {bitrate}?\n\nThe original file will be deleted after conversion.",
+  "@trackConvertConfirmMessage": {
+    "description": "Confirmation dialog message",
+    "placeholders": {
+      "sourceFormat": {"type": "String"},
+      "targetFormat": {"type": "String"},
+      "bitrate": {"type": "String"}
+    }
+  },
+  "trackConvertConverting": "Converting audio...",
+  "@trackConvertConverting": {"description": "Snackbar while converting"},
+  "trackConvertSuccess": "Converted to {format} successfully",
+  "@trackConvertSuccess": {
+    "description": "Snackbar after successful conversion",
+    "placeholders": {
+      "format": {"type": "String"}
+    }
+  },
+  "trackConvertFailed": "Conversion failed",
+  "@trackConvertFailed": {"description": "Snackbar when conversion fails"}
 }
@@ -548,14 +548,6 @@
  "@aboutSupport": {
    "description": "Section for support/donation links"
  },
-  "aboutBuyMeCoffee": "Buy me a coffee",
-  "@aboutBuyMeCoffee": {
-    "description": "Donation link"
-  },
-  "aboutBuyMeCoffeeSubtitle": "Support development on Ko-fi",
-  "@aboutBuyMeCoffeeSubtitle": {
-    "description": "Subtitle for donation"
-  },
  "aboutApp": "App",
  "@aboutApp": {
    "description": "Section for app info"
@@ -548,14 +548,6 @@
  "@aboutSupport": {
    "description": "Section for support/donation links"
  },
-  "aboutBuyMeCoffee": "Buy me a coffee",
-  "@aboutBuyMeCoffee": {
-    "description": "Donation link"
-  },
-  "aboutBuyMeCoffeeSubtitle": "Support development on Ko-fi",
-  "@aboutBuyMeCoffeeSubtitle": {
-    "description": "Subtitle for donation"
-  },
  "aboutApp": "App",
  "@aboutApp": {
    "description": "Section for app info"
@@ -548,14 +548,6 @@
  "@aboutSupport": {
    "description": "Section for support/donation links"
  },
-  "aboutBuyMeCoffee": "Buy me a coffee",
-  "@aboutBuyMeCoffee": {
-    "description": "Donation link"
-  },
-  "aboutBuyMeCoffeeSubtitle": "Support development on Ko-fi",
-  "@aboutBuyMeCoffeeSubtitle": {
-    "description": "Subtitle for donation"
-  },
  "aboutApp": "App",
  "@aboutApp": {
    "description": "Section for app info"
@@ -1,4 +1,5 @@
 import 'dart:io';
+import 'package:device_info_plus/device_info_plus.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:path_provider/path_provider.dart';
@@ -11,51 +12,113 @@ import 'package:spotiflac_android/services/cover_cache_manager.dart';

 void main() async {
  WidgetsFlutterBinding.ensureInitialized();
-  
-  await CoverCacheManager.initialize();
-  debugPrint('CoverCacheManager initialized: ${CoverCacheManager.isInitialized}');
-  
-  await Future.wait([
-    NotificationService().initialize(),
-    ShareIntentService().initialize(),
-  ]);
-  
+  final runtimeProfile = await _resolveRuntimeProfile();
+  _configureImageCache(runtimeProfile);
+
  runApp(
    ProviderScope(
-      child: const _EagerInitialization(
-        child: SpotiFLACApp(),
+      child: _EagerInitialization(
+        child: SpotiFLACApp(
+          disableOverscrollEffects: runtimeProfile.disableOverscrollEffects,
+        ),
      ),
    ),
  );
 }

+Future<_RuntimeProfile> _resolveRuntimeProfile() async {
+  const defaults = _RuntimeProfile(
+    imageCacheMaximumSize: 240,
+    imageCacheMaximumSizeBytes: 60 << 20,
+    disableOverscrollEffects: false,
+  );
+
+  if (!Platform.isAndroid) return defaults;
+
+  try {
+    final androidInfo = await DeviceInfoPlugin().androidInfo;
+    final isArm32Only = androidInfo.supported64BitAbis.isEmpty;
+    final isLowRamDevice =
+        androidInfo.isLowRamDevice || androidInfo.physicalRamSize <= 2500;
+
+    if (!isArm32Only && !isLowRamDevice) {
+      return defaults;
+    }
+
+    return _RuntimeProfile(
+      imageCacheMaximumSize: 120,
+      imageCacheMaximumSizeBytes: 24 << 20,
+      disableOverscrollEffects: true,
+    );
+  } catch (e) {
+    debugPrint('Failed to resolve runtime profile: $e');
+    return defaults;
+  }
+}
+
+void _configureImageCache(_RuntimeProfile runtimeProfile) {
+  final imageCache = PaintingBinding.instance.imageCache;
+  // Keep memory cache bounded so cover-heavy pages don't retain too many
+  // full-resolution images simultaneously.
+  imageCache.maximumSize = runtimeProfile.imageCacheMaximumSize;
+  imageCache.maximumSizeBytes = runtimeProfile.imageCacheMaximumSizeBytes;
+}
+
+class _RuntimeProfile {
+  final int imageCacheMaximumSize;
+  final int imageCacheMaximumSizeBytes;
+  final bool disableOverscrollEffects;
+
+  const _RuntimeProfile({
+    required this.imageCacheMaximumSize,
+    required this.imageCacheMaximumSizeBytes,
+    required this.disableOverscrollEffects,
+  });
+}
+
 /// Widget to eagerly initialize providers that need to load data on startup
 class _EagerInitialization extends ConsumerStatefulWidget {
  const _EagerInitialization({required this.child});
  final Widget child;

  @override
-  ConsumerState<_EagerInitialization> createState() => _EagerInitializationState();
+  ConsumerState<_EagerInitialization> createState() =>
+      _EagerInitializationState();
 }

 class _EagerInitializationState extends ConsumerState<_EagerInitialization> {
  @override
  void initState() {
    super.initState();
+    _initializeAppServices();
    _initializeExtensions();
    ref.read(downloadHistoryProvider);
  }

+  Future<void> _initializeAppServices() async {
+    try {
+      await CoverCacheManager.initialize();
+      await Future.wait([
+        NotificationService().initialize(),
+        ShareIntentService().initialize(),
+      ]);
+    } catch (e) {
+      debugPrint('Failed to initialize app services: $e');
+    }
+  }
+
  Future<void> _initializeExtensions() async {
    try {
      final appDir = await getApplicationDocumentsDirectory();
      final extensionsDir = '${appDir.path}/extensions';
      final dataDir = '${appDir.path}/extension_data';
-      
+
      await Directory(extensionsDir).create(recursive: true);
      await Directory(dataDir).create(recursive: true);
-      
-      await ref.read(extensionProvider.notifier).initialize(extensionsDir, dataDir);
+
+      await ref
+          .read(extensionProvider.notifier)
+          .initialize(extensionsDir, dataDir);
    } catch (e) {
      debugPrint('Failed to initialize extensions: $e');
    }
--- a/Show More
+++ b/Show More