docs: update Paxsenix integration to include all supported providers

- 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

.github/FUNDING.yml

@@ -1,4 +1,3 @@
 github: zarzet
 ko_fi: zarzet
-buy_me_a_coffee: zarzet
 

.github/workflows/pages.yml

@@ -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

.github/workflows/release.yml

@@ -71,7 +71,7 @@ jobs:
       - name: Setup Go
         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
@@ -174,7 +174,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v6
         with:
-          go-version: "1.25"
+          go-version: "1.26"
           cache-dependency-path: go_backend/go.sum
 
       # Cache CocoaPods

CHANGELOG.md

@@ -1,5 +1,244 @@
 # 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

README.md

@@ -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/dec9c96672ab80e6bf6b7a66786e612f5404446c341eb0311b4cc78fe10c96a1)
+[![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">
@@ -71,9 +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
@@ -97,7 +97,7 @@ The software is provided "as is", without warranty of any kind. The author assum
 - **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)
+- **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)
 

android/app/src/main/kotlin/com/zarz/spotiflac/MainActivity.kt

@@ -33,6 +33,7 @@ class MainActivity: FlutterFragmentActivity() {
     private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
     private var pendingSafTreeResult: MethodChannel.Result? = null
     private val safScanLock = Any()
+    private val safDirLock = Any()
     private var safScanProgress = SafScanProgress()
     @Volatile private var safScanCancel = false
     @Volatile private var safScanActive = false
@@ -299,27 +300,55 @@ class MainActivity: FlutterFragmentActivity() {
         return name.replace(Regex("[\\\\/:*?\"<>|]"), "_").trim()
     }
 
-    private fun ensureDocumentDir(treeUri: Uri, relativeDir: String): DocumentFile? {
-        var current = DocumentFile.fromTreeUri(this, treeUri) ?: return null
-        if (relativeDir.isBlank()) return current
+    private fun sanitizeRelativeDir(relativeDir: String): String {
+        if (relativeDir.isBlank()) return ""
+        return relativeDir
+            .split("/")
+            .map { sanitizeFilename(it) }
+            .filter { it.isNotBlank() && it != "." && it != ".." }
+            .joinToString("/")
+    }
 
-        val parts = relativeDir.split("/").filter { it.isNotBlank() }
-        for (part in parts) {
-            val existing = current.findFile(part)
-            current = if (existing != null && existing.isDirectory) {
-                existing
-            } else {
-                current.createDirectory(part) ?: return null
-            }
+    private fun ensureDocumentDir(treeUri: Uri, relativeDir: String): DocumentFile? {
+        val safeRelativeDir = sanitizeRelativeDir(relativeDir)
+        if (safeRelativeDir.isBlank()) {
+            return DocumentFile.fromTreeUri(this, treeUri)
+        }
+
+        // Synchronize to prevent concurrent downloads from creating duplicate
+        // directories with (1), (2) suffixes via SAF's auto-rename behavior.
+        synchronized(safDirLock) {
+            var current = DocumentFile.fromTreeUri(this, treeUri) ?: return null
+
+            val parts = safeRelativeDir.split("/").filter { it.isNotBlank() }
+            for (part in parts) {
+                val existing = current.findFile(part)
+                current = if (existing != null && existing.isDirectory) {
+                    existing
+                } else {
+                    val created = current.createDirectory(part) ?: return null
+                    // SAF may auto-rename to "part (1)" if another thread just created it.
+                    // Re-check: if the created name differs, delete it and use the original.
+                    val createdName = created.name ?: part
+                    if (createdName != part) {
+                        // Another thread won the race; delete the duplicate and use theirs.
+                        created.delete()
+                        current.findFile(part) ?: return null
+                    } else {
+                        created
+                    }
+                }
+            }
+            return current
         }
-        return current
     }
 
     private fun findDocumentDir(treeUri: Uri, relativeDir: String): DocumentFile? {
         var current = DocumentFile.fromTreeUri(this, treeUri) ?: return null
-        if (relativeDir.isBlank()) return current
+        val safeRelativeDir = sanitizeRelativeDir(relativeDir)
+        if (safeRelativeDir.isBlank()) return current
 
-        val parts = relativeDir.split("/").filter { it.isNotBlank() }
+        val parts = safeRelativeDir.split("/").filter { it.isNotBlank() }
         for (part in parts) {
             val existing = current.findFile(part)
             if (existing == null || !existing.isDirectory) return null
@@ -359,14 +388,21 @@ class MainActivity: FlutterFragmentActivity() {
             obj.put("relative_dir", "")
             return obj.toString()
         }
+        val safeRelativeDir = sanitizeRelativeDir(relativeDir)
+        val safeFileName = sanitizeFilename(fileName)
+        if (safeFileName.isBlank()) {
+            obj.put("uri", "")
+            obj.put("relative_dir", "")
+            return obj.toString()
+        }
 
         val treeUri = Uri.parse(treeUriStr)
-        val targetDir = findDocumentDir(treeUri, relativeDir)
+        val targetDir = findDocumentDir(treeUri, safeRelativeDir)
         if (targetDir != null) {
-            val direct = targetDir.findFile(fileName)
+            val direct = targetDir.findFile(safeFileName)
             if (direct != null && direct.isFile) {
                 obj.put("uri", direct.uri.toString())
-                obj.put("relative_dir", relativeDir)
+                obj.put("relative_dir", safeRelativeDir)
                 return obj.toString()
             }
         }
@@ -392,7 +428,7 @@ class MainActivity: FlutterFragmentActivity() {
                     val childPath = if (path.isBlank()) childName else "$path/$childName"
                     queue.add(child to childPath)
                 } else if (child.isFile) {
-                    if (child.name == fileName) {
+                    if (child.name == safeFileName) {
                         obj.put("uri", child.uri.toString())
                         obj.put("relative_dir", path)
                         return obj.toString()
@@ -408,7 +444,7 @@ class MainActivity: FlutterFragmentActivity() {
 
     private fun buildSafFileName(req: JSONObject, outputExt: String): String {
         val provided = req.optString("saf_file_name", "")
-        if (provided.isNotBlank()) return provided
+        if (provided.isNotBlank()) return sanitizeFilename(provided)
 
         val trackName = req.optString("track_name", "track")
         val artistName = req.optString("artist_name", "")
@@ -599,7 +635,7 @@ class MainActivity: FlutterFragmentActivity() {
         }
 
         val treeUri = Uri.parse(treeUriStr)
-        val relativeDir = req.optString("saf_relative_dir", "")
+        val relativeDir = sanitizeRelativeDir(req.optString("saf_relative_dir", ""))
         val outputExt = normalizeExt(req.optString("saf_output_ext", ""))
         val mimeType = mimeTypeForExt(outputExt)
         val fileName = buildSafFileName(req, outputExt)
@@ -1276,20 +1312,11 @@ class MainActivity: FlutterFragmentActivity() {
                             }
                             result.success(response)
                         }
-                        "downloadTrack" -> {
+                        "downloadByStrategy" -> {
                             val requestJson = call.arguments as String
                             val response = withContext(Dispatchers.IO) {
                                 handleSafDownload(requestJson) { json ->
-                                    Gobackend.downloadTrack(json)
-                                }
-                            }
-                            result.success(response)
-                        }
-                        "downloadWithFallback" -> {
-                            val requestJson = call.arguments as String
-                            val response = withContext(Dispatchers.IO) {
-                                handleSafDownload(requestJson) { json ->
-                                    Gobackend.downloadWithFallback(json)
+                                    Gobackend.downloadByStrategy(json)
                                 }
                             }
                             result.success(response)
@@ -1465,11 +1492,12 @@ class MainActivity: FlutterFragmentActivity() {
                         "safCreateFromPath" -> {
                             val treeUriStr = call.argument<String>("tree_uri") ?: ""
                             val relativeDir = call.argument<String>("relative_dir") ?: ""
-                            val fileName = call.argument<String>("file_name") ?: ""
+                            val fileName = sanitizeFilename(call.argument<String>("file_name") ?: "")
                             val mimeType = call.argument<String>("mime_type") ?: "application/octet-stream"
                             val srcPath = call.argument<String>("src_path") ?: ""
                             val createdUri = withContext(Dispatchers.IO) {
                                 if (treeUriStr.isBlank()) return@withContext null
+                                if (fileName.isBlank()) return@withContext null
                                 val dir = ensureDocumentDir(Uri.parse(treeUriStr), relativeDir) ?: return@withContext null
                                 val existing = dir.findFile(fileName)
                                 val createdNew = existing == null
@@ -1554,6 +1582,32 @@ class MainActivity: FlutterFragmentActivity() {
                             }
                             result.success(response)
                         }
+                        "getLyricsLRCWithSource" -> {
+                            val spotifyId = call.argument<String>("spotify_id") ?: ""
+                            val trackName = call.argument<String>("track_name") ?: ""
+                            val artistName = call.argument<String>("artist_name") ?: ""
+                            val filePath = call.argument<String>("file_path") ?: ""
+                            val durationMs = call.argument<Int>("duration_ms")?.toLong() ?: 0L
+                            val response = withContext(Dispatchers.IO) {
+                                if (filePath.startsWith("content://")) {
+                                    val tempPath = copyUriToTemp(Uri.parse(filePath))
+                                    if (tempPath == null) {
+                                        """{"lyrics":"","source":"","sync_type":"","instrumental":false}"""
+                                    } else {
+                                        try {
+                                            Gobackend.getLyricsLRCWithSource(spotifyId, trackName, artistName, tempPath, durationMs)
+                                        } finally {
+                                            try {
+                                                File(tempPath).delete()
+                                            } catch (_: Exception) {}
+                                        }
+                                    }
+                                } else {
+                                    Gobackend.getLyricsLRCWithSource(spotifyId, trackName, artistName, filePath, durationMs)
+                                }
+                            }
+                            result.success(response)
+                        }
                         "embedLyricsToFile" -> {
                             val filePath = call.argument<String>("file_path") ?: ""
                             val lyrics = call.argument<String>("lyrics") ?: ""
@@ -1716,7 +1770,7 @@ class MainActivity: FlutterFragmentActivity() {
                             val trackName = call.argument<String>("track_name") ?: ""
                             val artistName = call.argument<String>("artist_name") ?: ""
                             val spotifyId = call.argument<String>("spotify_id") ?: ""
-                            val durationMs = call.argument<Long>("duration_ms") ?: 0L
+                            val durationMs = call.argument<Number>("duration_ms")?.toLong() ?: 0L
                             val outputPath = call.argument<String>("output_path") ?: ""
                             val response = withContext(Dispatchers.IO) {
                                 try {
@@ -1728,6 +1782,60 @@ class MainActivity: FlutterFragmentActivity() {
                             }
                             result.success(response)
                         }
+                        "setLyricsProviders" -> {
+                            val providersJson = call.argument<String>("providers_json") ?: "[]"
+                            val response = withContext(Dispatchers.IO) {
+                                try {
+                                    Gobackend.setLyricsProvidersJSON(providersJson)
+                                    """{"success":true}"""
+                                } catch (e: Exception) {
+                                    """{"success":false,"error":"${e.message?.replace("\"", "'")}"}"""
+                                }
+                            }
+                            result.success(response)
+                        }
+                        "getLyricsProviders" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                try {
+                                    Gobackend.getLyricsProvidersJSON()
+                                } catch (e: Exception) {
+                                    "[]"
+                                }
+                            }
+                            result.success(response)
+                        }
+                        "getAvailableLyricsProviders" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                try {
+                                    Gobackend.getAvailableLyricsProvidersJSON()
+                                } catch (e: Exception) {
+                                    "[]"
+                                }
+                            }
+                            result.success(response)
+                        }
+                        "setLyricsFetchOptions" -> {
+                            val optionsJson = call.argument<String>("options_json") ?: "{}"
+                            val response = withContext(Dispatchers.IO) {
+                                try {
+                                    Gobackend.setLyricsFetchOptionsJSON(optionsJson)
+                                    """{"success":true}"""
+                                } catch (e: Exception) {
+                                    """{"success":false,"error":"${e.message?.replace("\"", "'")}"}"""
+                                }
+                            }
+                            result.success(response)
+                        }
+                        "getLyricsFetchOptions" -> {
+                            val response = withContext(Dispatchers.IO) {
+                                try {
+                                    Gobackend.getLyricsFetchOptionsJSON()
+                                } catch (e: Exception) {
+                                    "{}"
+                                }
+                            }
+                            result.success(response)
+                        }
                         "reEnrichFile" -> {
                             val requestJson = call.argument<String>("request_json") ?: "{}"
                             val response = withContext(Dispatchers.IO) {
@@ -2093,24 +2201,6 @@ class MainActivity: FlutterFragmentActivity() {
                             }
                             result.success(response)
                         }
-                        "downloadWithExtensions" -> {
-                            val requestJson = call.arguments as String
-                            val response = withContext(Dispatchers.IO) {
-                                handleSafDownload(requestJson) { json ->
-                                    Gobackend.downloadWithExtensionsJSON(json)
-                                }
-                            }
-                            result.success(response)
-                        }
-                        "downloadFromYouTube" -> {
-                            val requestJson = call.arguments as String
-                            val response = withContext(Dispatchers.IO) {
-                                handleSafDownload(requestJson) { json ->
-                                    Gobackend.downloadFromYouTube(json)
-                                }
-                            }
-                            result.success(response)
-                        }
                         "enrichTrackWithExtension" -> {
                             val extensionId = call.argument<String>("extension_id") ?: ""
                             val trackJson = call.argument<String>("track") ?: "{}"

go_backend/amazon.go

@@ -31,6 +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
@@ -43,6 +45,12 @@ type AfkarXYZResponse struct {
 	} `json:"data"`
 }
 
+// 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 {
 	amazonDownloaderOnce.Do(func() {
 		globalAmazonDownloader = &AmazonDownloader{
@@ -52,10 +60,9 @@ func NewAmazonDownloader() *AmazonDownloader {
 	return globalAmazonDownloader
 }
 
-// fetchAmazonURLWithRetry fetches from AfkarXYZ API with retry logic for mobile networks
-func (a *AmazonDownloader) fetchAmazonURLWithRetry(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 {
@@ -64,66 +71,184 @@ func (a *AmazonDownloader) fetchAmazonURLWithRetry(amazonURL string) (string, st
 			time.Sleep(delay)
 		}
 
-		downloadURL, fileName, err := a.doAfkarXYZRequest(apiURL)
+		downloadURL, fileName, decryptionKey, err := a.doAfkarXYZRequest(amazonURL)
 		if err == nil {
-			return downloadURL, fileName, nil
+			return downloadURL, fileName, decryptionKey, nil
 		}
 
 		lastErr = err
-		errStr := err.Error()
+		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, "eof") ||
 			strings.Contains(errStr, "status 5") ||
-			strings.Contains(errStr, "status 429")
+			strings.Contains(errStr, "status 429") ||
+			strings.Contains(errStr, "http 429")
 
 		if !isRetryable {
-			return "", "", err
+			return "", "", "", err
 		}
 
 		GoLog("[Amazon] Attempt %d failed (retryable): %v\n", attempt+1, err)
 	}
 
-	return "", "", fmt.Errorf("all %d attempts failed: %w", amazonMaxRetries+1, lastErr)
+	return "", "", "", fmt.Errorf("all %d attempts failed: %w", amazonMaxRetries+1, lastErr)
 }
 
-// doAfkarXYZRequest performs a single request to AfkarXYZ API
-func (a *AmazonDownloader) doAfkarXYZRequest(apiURL string) (string, string, error) {
+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
@@ -134,19 +259,22 @@ func (a *AmazonDownloader) doAfkarXYZRequest(apiURL string) (string, string, err
 	reg := regexp.MustCompile(`[<>:"/\\|?*]`)
 	fileName = reg.ReplaceAllString(fileName, "")
 
-	return apiResp.Data.DirectLink, fileName, nil
+	return apiResp.Data.DirectLink, fileName, "", nil
 }
 
-func (a *AmazonDownloader) downloadFromAfkarXYZ(amazonURL string) (string, string, error) {
+func (a *AmazonDownloader) downloadFromAfkarXYZ(amazonURL string) (string, string, string, error) {
 	GoLog("[Amazon] Fetching from AfkarXYZ API...\n")
 
-	downloadURL, fileName, err := a.fetchAmazonURLWithRetry(amazonURL)
+	downloadURL, fileName, decryptionKey, err := a.fetchAmazonURLWithRetry(amazonURL)
 	if err != nil {
-		return "", "", err
+		return "", "", "", err
 	}
 
+	if decryptionKey != "" {
+		GoLog("[Amazon] AfkarXYZ returned encrypted stream (decryption key available)\n")
+	}
 	GoLog("[Amazon] AfkarXYZ returned: %s\n", fileName)
-	return downloadURL, fileName, nil
+	return downloadURL, fileName, decryptionKey, nil
 }
 
 func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath string, outputFD int, itemID string) error {
@@ -233,17 +361,18 @@ func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath string, outputFD
 
 // 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
-	LyricsLRC   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) {
@@ -299,7 +428,7 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	}
 
 	// Download using AfkarXYZ API
-	downloadURL, _, err := downloader.downloadFromAfkarXYZ(amazonURL)
+	downloadURL, afkarFileName, decryptionKey, err := downloader.downloadFromAfkarXYZ(amazonURL)
 	if err != nil {
 		return AmazonDownloadResult{}, fmt.Errorf("failed to get download URL from AfkarXYZ: %w", err)
 	}
@@ -312,6 +441,7 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		"album":  req.AlbumName,
 		"track":  req.TrackNumber,
 		"year":   extractYear(req.ReleaseDate),
+		"date":   req.ReleaseDate,
 		"disc":   req.DiscNumber,
 	})
 	var outputPath string
@@ -321,7 +451,11 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 			outputPath = fmt.Sprintf("/proc/self/fd/%d", req.OutputFD)
 		}
 	} else {
-		filename = sanitizeFilename(filename) + ".flac"
+		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
@@ -352,6 +486,12 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		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
 
@@ -360,7 +500,6 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		SetItemFinalizing(req.ItemID)
 	}
 
-	existingMeta, metaErr := ReadMetadata(outputPath)
 	actualTrackNum := req.TrackNumber
 	actualDiscNum := req.DiscNumber
 	actualDate := req.ReleaseDate
@@ -368,25 +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{
@@ -409,7 +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))
@@ -418,11 +560,16 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		}
 	}
 
-	if isSafOutput {
+	if isSafOutput || needsDecryption {
 		GoLog("[Amazon] SAF output detected - skipping in-backend metadata/lyrics embedding (handled in Flutter)\n")
 	} else {
-		if err := EmbedMetadataWithCoverData(outputPath, metadata, coverData); err != nil {
-			GoLog("[Amazon] Warning: failed to embed metadata: %v\n", err)
+		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 req.EmbedLyrics && parallelResult != nil && parallelResult.LyricsLRC != "" {
@@ -433,20 +580,22 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 
 			if lyricsMode == "external" || lyricsMode == "both" {
 				GoLog("[Amazon] Saving external LRC file...\n")
-				if lrcPath, lrcErr := SaveLRCFile(outputPath, parallelResult.LyricsLRC); lrcErr != nil {
+				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" {
+			if (lyricsMode == "embed" || lyricsMode == "both") && isFlacOutput {
 				GoLog("[Amazon] Embedding parallel-fetched lyrics (%d lines)...\n", len(parallelResult.LyricsData.Lines))
-				if embedErr := EmbedLyrics(outputPath, parallelResult.LyricsLRC); embedErr != nil {
+				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")
@@ -456,17 +605,17 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	GoLog("[Amazon] Downloaded successfully from Amazon Music\n")
 
 	quality := AudioQuality{}
-	if isSafOutput {
+	if isSafOutput || needsDecryption {
 		GoLog("[Amazon] SAF output detected - skipping post-write file inspection in backend\n")
 	} else {
-		quality, err = GetAudioQuality(outputPath)
+		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)
+		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)
@@ -478,9 +627,10 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		}
 	}
 
-	// Add to ISRC index for fast duplicate checking
-	if !isSafOutput {
-		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
@@ -496,16 +646,17 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	}
 
 	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,
-		LyricsLRC:   lyricsLRC,
+		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
 }

go_backend/amazon_asin_test.go

@@ -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)
+			}
+		})
+	}
+}

go_backend/audio_metadata.go

@@ -23,6 +23,7 @@ type AudioMetadata struct {
 	TrackNumber int
 	DiscNumber  int
 	ISRC        string
+	Lyrics      string
 	Label       string
 	Copyright   string
 	Composer    string
@@ -42,6 +43,7 @@ type OggQuality struct {
 	SampleRate int
 	BitDepth   int
 	Duration   int
+	Bitrate    int // estimated bitrate in bps
 }
 
 // =============================================================================
@@ -181,6 +183,15 @@ func parseID3v22Frames(data []byte, metadata *AudioMetadata, tagUnsync bool) {
 			metadata.Label = value
 		case "TCR":
 			metadata.Copyright = value
+		case "ULT":
+			if v := extractLyricsFrame(frameData); v != "" && metadata.Lyrics == "" {
+				metadata.Lyrics = v
+			}
+		case "TXX":
+			desc, userValue := extractUserTextFrame(frameData)
+			if isLyricsDescription(desc) && userValue != "" && metadata.Lyrics == "" {
+				metadata.Lyrics = userValue
+			}
 		}
 
 		pos += 6 + frameSize
@@ -297,6 +308,15 @@ func parseID3v23Frames(data []byte, metadata *AudioMetadata, version byte, tagUn
 			if v := extractCommentFrame(frameData); v != "" {
 				metadata.Comment = v
 			}
+		case "USLT":
+			if v := extractLyricsFrame(frameData); v != "" && metadata.Lyrics == "" {
+				metadata.Lyrics = v
+			}
+		case "TXXX":
+			desc, userValue := extractUserTextFrame(frameData)
+			if isLyricsDescription(desc) && userValue != "" && metadata.Lyrics == "" {
+				metadata.Lyrics = userValue
+			}
 		}
 
 		pos += 10 + frameSize
@@ -399,6 +419,98 @@ func extractCommentFrame(data []byte) string {
 	return extractTextFrame(framed)
 }
 
+// extractLyricsFrame parses ID3 unsynchronized lyrics frames (USLT/ULT).
+// Format: encoding(1) + language(3) + description(null-terminated) + lyrics text.
+func extractLyricsFrame(data []byte) string {
+	if len(data) < 5 {
+		return ""
+	}
+
+	encoding := data[0]
+	rest := data[4:] // skip 3-byte language code
+
+	var text []byte
+	switch encoding {
+	case 1, 2: // UTF-16 variants use double-null terminator
+		for i := 0; i+1 < len(rest); i += 2 {
+			if rest[i] == 0 && rest[i+1] == 0 {
+				text = rest[i+2:]
+				break
+			}
+		}
+	default: // ISO-8859-1 or UTF-8
+		idx := bytes.IndexByte(rest, 0)
+		if idx >= 0 && idx+1 < len(rest) {
+			text = rest[idx+1:]
+		} else {
+			text = rest
+		}
+	}
+
+	if len(text) == 0 {
+		return ""
+	}
+
+	framed := make([]byte, 1+len(text))
+	framed[0] = encoding
+	copy(framed[1:], text)
+	return extractTextFrame(framed)
+}
+
+// extractUserTextFrame parses ID3 TXXX/TXX user text frame:
+// encoding(1) + description + separator + value.
+func extractUserTextFrame(data []byte) (string, string) {
+	if len(data) < 2 {
+		return "", ""
+	}
+
+	encoding := data[0]
+	payload := data[1:]
+
+	var descRaw, valueRaw []byte
+	switch encoding {
+	case 1, 2: // UTF-16 variants
+		for i := 0; i+1 < len(payload); i += 2 {
+			if payload[i] == 0 && payload[i+1] == 0 {
+				descRaw = payload[:i]
+				valueRaw = payload[i+2:]
+				break
+			}
+		}
+	default: // ISO-8859-1 or UTF-8
+		idx := bytes.IndexByte(payload, 0)
+		if idx >= 0 {
+			descRaw = payload[:idx]
+			if idx+1 <= len(payload) {
+				valueRaw = payload[idx+1:]
+			}
+		}
+	}
+
+	if len(valueRaw) == 0 {
+		return "", ""
+	}
+
+	descFramed := make([]byte, 1+len(descRaw))
+	descFramed[0] = encoding
+	copy(descFramed[1:], descRaw)
+
+	valueFramed := make([]byte, 1+len(valueRaw))
+	valueFramed[0] = encoding
+	copy(valueFramed[1:], valueRaw)
+
+	return strings.TrimSpace(extractTextFrame(descFramed)), strings.TrimSpace(extractTextFrame(valueFramed))
+}
+
+func isLyricsDescription(description string) bool {
+	switch strings.ToLower(strings.TrimSpace(description)) {
+	case "lyrics", "lyric", "unsyncedlyrics", "unsynced lyrics", "lrc":
+		return true
+	default:
+		return false
+	}
+}
+
 func decodeUTF16(data []byte) string {
 	if len(data) < 2 {
 		return ""
@@ -553,50 +665,144 @@ func GetMP3Quality(filePath string) (*MP3Quality, error) {
 
 	file.Seek(audioStart, io.SeekStart)
 
+	// Find first valid MP3 frame sync
 	frameHeader := make([]byte, 4)
-	for i := 0; i < 10000; i++ { // Search first 10KB
+	var frameStart int64 = -1
+	for i := 0; i < 10000; i++ {
 		if _, err := io.ReadFull(file, frameHeader); err != nil {
 			break
 		}
 
 		if frameHeader[0] == 0xFF && (frameHeader[1]&0xE0) == 0xE0 {
-			version := (frameHeader[1] >> 3) & 0x03
-			layer := (frameHeader[1] >> 1) & 0x03
-			bitrateIdx := (frameHeader[2] >> 4) & 0x0F
-			sampleRateIdx := (frameHeader[2] >> 2) & 0x03
-
-			sampleRates := [][]int{
-				{11025, 12000, 8000},
-				{0, 0, 0},
-				{22050, 24000, 16000},
-				{44100, 48000, 32000},
-			}
-			if version < 4 && sampleRateIdx < 3 {
-				quality.SampleRate = sampleRates[version][sampleRateIdx]
-			}
-
-			if version == 3 && layer == 1 {
-				bitrates := []int{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0}
-				if bitrateIdx < 16 {
-					quality.Bitrate = bitrates[bitrateIdx] * 1000
-				}
-			}
-
-			quality.BitDepth = 16
-
-			if quality.Bitrate > 0 {
-				audioSize := fileSize - audioStart - 128
-				if audioSize > 0 {
-					quality.Duration = int(audioSize * 8 / int64(quality.Bitrate))
-				}
-			}
-
+			pos, _ := file.Seek(0, io.SeekCurrent)
+			frameStart = pos - 4
 			break
 		}
 
 		file.Seek(-3, io.SeekCurrent)
 	}
 
+	if frameStart < 0 {
+		return quality, nil
+	}
+
+	version := (frameHeader[1] >> 3) & 0x03
+	layer := (frameHeader[1] >> 1) & 0x03
+	bitrateIdx := (frameHeader[2] >> 4) & 0x0F
+	sampleRateIdx := (frameHeader[2] >> 2) & 0x03
+	channelMode := (frameHeader[3] >> 6) & 0x03
+
+	// Sample rate tables: [version][index]
+	// version: 0=MPEG2.5, 1=reserved, 2=MPEG2, 3=MPEG1
+	sampleRates := [][]int{
+		{11025, 12000, 8000},
+		{0, 0, 0},
+		{22050, 24000, 16000},
+		{44100, 48000, 32000},
+	}
+	if version < 4 && sampleRateIdx < 3 {
+		quality.SampleRate = sampleRates[version][sampleRateIdx]
+	}
+
+	// Bitrate tables for all MPEG versions and layers
+	// MPEG1 Layer III
+	if version == 3 && layer == 1 {
+		bitrates := []int{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0}
+		if bitrateIdx < 16 {
+			quality.Bitrate = bitrates[bitrateIdx] * 1000
+		}
+	}
+	// MPEG2/2.5 Layer III
+	if (version == 0 || version == 2) && layer == 1 {
+		bitrates := []int{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0}
+		if bitrateIdx < 16 {
+			quality.Bitrate = bitrates[bitrateIdx] * 1000
+		}
+	}
+
+	// Determine samples per frame for duration calculation
+	samplesPerFrame := 1152 // MPEG1 Layer III
+	if version == 0 || version == 2 {
+		samplesPerFrame = 576 // MPEG2/2.5 Layer III
+	}
+
+	// Try to read Xing/VBRI header from the first frame for VBR info
+	// Xing header offset depends on MPEG version and channel mode
+	var xingOffset int
+	if version == 3 { // MPEG1
+		if channelMode == 3 { // Mono
+			xingOffset = 17
+		} else {
+			xingOffset = 32
+		}
+	} else { // MPEG2/2.5
+		if channelMode == 3 {
+			xingOffset = 9
+		} else {
+			xingOffset = 17
+		}
+	}
+
+	// Read enough of the first frame to find Xing/VBRI header
+	xingBuf := make([]byte, 200)
+	file.Seek(frameStart+4, io.SeekStart)
+	n, _ := io.ReadFull(file, xingBuf)
+	xingBuf = xingBuf[:n]
+
+	vbrFrames := 0
+	vbrBytes := int64(0)
+	isVBR := false
+
+	// Check for Xing/Info header
+	if xingOffset+8 <= n {
+		tag := string(xingBuf[xingOffset : xingOffset+4])
+		if tag == "Xing" || tag == "Info" {
+			flags := binary.BigEndian.Uint32(xingBuf[xingOffset+4 : xingOffset+8])
+			off := xingOffset + 8
+			if flags&0x01 != 0 && off+4 <= n { // Frames flag
+				vbrFrames = int(binary.BigEndian.Uint32(xingBuf[off : off+4]))
+				off += 4
+			}
+			if flags&0x02 != 0 && off+4 <= n { // Bytes flag
+				vbrBytes = int64(binary.BigEndian.Uint32(xingBuf[off : off+4]))
+			}
+			if vbrFrames > 0 {
+				isVBR = true
+			}
+		}
+	}
+
+	// Check for VBRI header (always at offset 32 from frame start + 4)
+	if !isVBR && 36+26 <= n {
+		if string(xingBuf[32:36]) == "VBRI" {
+			vbrBytes = int64(binary.BigEndian.Uint32(xingBuf[36+6 : 36+10]))
+			vbrFrames = int(binary.BigEndian.Uint32(xingBuf[36+10 : 36+14]))
+			if vbrFrames > 0 {
+				isVBR = true
+			}
+		}
+	}
+
+	if isVBR && vbrFrames > 0 && quality.SampleRate > 0 {
+		// Accurate duration from total frames
+		totalSamples := int64(vbrFrames) * int64(samplesPerFrame)
+		quality.Duration = int(totalSamples / int64(quality.SampleRate))
+
+		// Accurate average bitrate
+		if vbrBytes > 0 && quality.Duration > 0 {
+			quality.Bitrate = int(vbrBytes * 8 / int64(quality.Duration))
+		} else if quality.Duration > 0 {
+			audioSize := fileSize - audioStart
+			quality.Bitrate = int(audioSize * 8 / int64(quality.Duration))
+		}
+	} else if quality.Bitrate > 0 {
+		// CBR fallback: estimate duration from file size and frame bitrate
+		audioSize := fileSize - audioStart - 128 // subtract possible ID3v1 tag
+		if audioSize > 0 {
+			quality.Duration = int(audioSize * 8 / int64(quality.Bitrate))
+		}
+	}
+
 	return quality, nil
 }
 
@@ -800,9 +1006,16 @@ func parseVorbisComments(data []byte, metadata *AudioMetadata) {
 			break
 		}
 
-		if commentLen > 10000 {
+		remaining := uint32(reader.Len())
+		if commentLen > remaining {
 			break
 		}
+		// Large comment entries are typically METADATA_BLOCK_PICTURE.
+		// Skip them so we can continue parsing normal text tags after/before.
+		if commentLen > 512*1024 {
+			reader.Seek(int64(commentLen), io.SeekCurrent)
+			continue
+		}
 
 		comment := make([]byte, commentLen)
 		if _, err := reader.Read(comment); err != nil {
@@ -843,6 +1056,10 @@ func parseVorbisComments(data []byte, metadata *AudioMetadata) {
 			metadata.Composer = value
 		case "COMMENT", "DESCRIPTION":
 			metadata.Comment = value
+		case "LYRICS", "UNSYNCEDLYRICS":
+			if metadata.Lyrics == "" {
+				metadata.Lyrics = value
+			}
 		case "ORGANIZATION", "LABEL", "PUBLISHER":
 			metadata.Label = value
 		case "COPYRIGHT":
@@ -859,7 +1076,6 @@ func GetOggQuality(filePath string) (*OggQuality, error) {
 	defer file.Close()
 
 	quality := &OggQuality{}
-	isOpus := false
 
 	packets, err := collectOggPackets(file, 5, 10)
 	if err != nil && len(packets) == 0 {
@@ -875,15 +1091,17 @@ func GetOggQuality(filePath string) (*OggQuality, error) {
 		}
 	}
 
-	if streamType == oggStreamOpus {
-		isOpus = true
+	isOpus := streamType == oggStreamOpus
+	var preSkip int
+
+	if isOpus {
 		for _, pkt := range packets {
 			if len(pkt) >= 19 && string(pkt[0:8]) == "OpusHead" {
 				quality.SampleRate = int(binary.LittleEndian.Uint32(pkt[12:16]))
 				if quality.SampleRate == 0 {
 					quality.SampleRate = 48000
 				}
-				quality.BitDepth = 16
+				preSkip = int(binary.LittleEndian.Uint16(pkt[10:12]))
 				break
 			}
 		}
@@ -891,26 +1109,76 @@ func GetOggQuality(filePath string) (*OggQuality, error) {
 		for _, pkt := range packets {
 			if len(pkt) > 29 && pkt[0] == 0x01 && string(pkt[1:7]) == "vorbis" {
 				quality.SampleRate = int(binary.LittleEndian.Uint32(pkt[12:16]))
-				quality.BitDepth = 16
 				break
 			}
 		}
 	}
 
+	// Read granule position from the last Ogg page for accurate duration
 	stat, err := file.Stat()
-	if err == nil {
-		// Very rough duration estimate based on file size
-		// Assume ~128kbps average for Opus, ~160kbps for Vorbis
-		avgBitrate := 128000
-		if !isOpus {
-			avgBitrate = 160000
+	if err != nil {
+		return quality, nil
+	}
+	fileSize := stat.Size()
+
+	granule := readLastOggGranulePosition(file, fileSize)
+	if granule > 0 {
+		if isOpus {
+			// Opus always uses 48kHz granule position internally
+			totalSamples := granule - int64(preSkip)
+			if totalSamples > 0 {
+				quality.Duration = int(totalSamples / 48000)
+			}
+		} else if quality.SampleRate > 0 {
+			quality.Duration = int(granule / int64(quality.SampleRate))
 		}
-		quality.Duration = int(stat.Size() * 8 / int64(avgBitrate))
+	}
+
+	// Calculate average bitrate from file size and actual duration
+	if quality.Duration > 0 {
+		quality.Bitrate = int(fileSize * 8 / int64(quality.Duration))
 	}
 
 	return quality, nil
 }
 
+// readLastOggGranulePosition seeks to the end of the file and scans backwards
+// to find the last Ogg page, then reads its granule position (bytes 6-13).
+func readLastOggGranulePosition(file *os.File, fileSize int64) int64 {
+	// Read the last chunk of the file to find the last OggS sync
+	searchSize := int64(65536)
+	if searchSize > fileSize {
+		searchSize = fileSize
+	}
+
+	buf := make([]byte, searchSize)
+	offset := fileSize - searchSize
+	if offset < 0 {
+		offset = 0
+	}
+	n, err := file.ReadAt(buf, offset)
+	if err != nil && n == 0 {
+		return 0
+	}
+	buf = buf[:n]
+
+	// Scan backwards for "OggS" magic
+	lastPageOffset := -1
+	for i := n - 4; i >= 0; i-- {
+		if buf[i] == 'O' && buf[i+1] == 'g' && buf[i+2] == 'g' && buf[i+3] == 'S' {
+			lastPageOffset = i
+			break
+		}
+	}
+
+	if lastPageOffset < 0 || lastPageOffset+14 > n {
+		return 0
+	}
+
+	// Granule position is at bytes 6-13 of the Ogg page header (little-endian int64)
+	return int64(binary.LittleEndian.Uint64(buf[lastPageOffset+6 : lastPageOffset+14]))
+}
+
 // =============================================================================
 // ID3v1 Genre List
 // =============================================================================

go_backend/deezer.go

@@ -28,15 +28,23 @@ const (
 	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 (
@@ -47,16 +55,111 @@ var (
 func GetDeezerClient() *DeezerClient {
 	deezerClientOnce.Do(func() {
 		deezerClient = &DeezerClient{
-			httpClient:  NewMetadataHTTPClient(deezerAPITimeoutMobile),
-			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"`
@@ -414,10 +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
@@ -555,10 +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
@@ -638,10 +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
@@ -807,6 +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()
 	}
 
@@ -841,6 +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)
 	}
@@ -864,6 +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
@@ -946,10 +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)

go_backend/exports.go

@@ -8,6 +8,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"path/filepath"
 	"strings"
 	"time"
 
@@ -47,10 +48,30 @@ func GetSpotifyMetadata(spotifyURL string) (string, error) {
 
 	client, err := NewSpotifyMetadataClient()
 	if err != nil {
+		if shouldTrySpotFetchFallback(err) {
+			data, apiErr := GetSpotifyDataWithAPI(ctx, spotifyURL, DefaultSpotFetchAPIBaseURL)
+			if apiErr == nil {
+				jsonBytes, marshalErr := json.Marshal(data)
+				if marshalErr != nil {
+					return "", marshalErr
+				}
+				return string(jsonBytes), nil
+			}
+		}
 		return "", err
 	}
 	data, err := client.GetFilteredData(ctx, spotifyURL, false, 0)
 	if err != nil {
+		if shouldTrySpotFetchFallback(err) {
+			fallbackData, apiErr := GetSpotifyDataWithAPI(ctx, spotifyURL, DefaultSpotFetchAPIBaseURL)
+			if apiErr == nil {
+				jsonBytes, marshalErr := json.Marshal(fallbackData)
+				if marshalErr != nil {
+					return "", marshalErr
+				}
+				return string(jsonBytes), nil
+			}
+		}
 		return "", err
 	}
 
@@ -150,6 +171,8 @@ type DownloadRequest struct {
 	QobuzID              string `json:"qobuz_id,omitempty"`
 	DeezerID             string `json:"deezer_id,omitempty"`
 	LyricsMode           string `json:"lyrics_mode,omitempty"`
+	UseExtensions        bool   `json:"use_extensions,omitempty"`
+	UseFallback          bool   `json:"use_fallback,omitempty"`
 }
 
 type DownloadResponse struct {
@@ -176,20 +199,179 @@ type DownloadResponse struct {
 	Copyright              string `json:"copyright,omitempty"`
 	SkipMetadataEnrichment bool   `json:"skip_metadata_enrichment,omitempty"`
 	LyricsLRC              string `json:"lyrics_lrc,omitempty"`
+	DecryptionKey          string `json:"decryption_key,omitempty"`
 }
 
 type DownloadResult struct {
-	FilePath    string
-	BitDepth    int
-	SampleRate  int
-	Title       string
-	Artist      string
-	Album       string
-	ReleaseDate string
-	TrackNumber int
-	DiscNumber  int
-	ISRC        string
-	LyricsLRC   string
+	FilePath      string
+	BitDepth      int
+	SampleRate    int
+	Title         string
+	Artist        string
+	Album         string
+	ReleaseDate   string
+	TrackNumber   int
+	DiscNumber    int
+	ISRC          string
+	Genre         string
+	Label         string
+	Copyright     string
+	LyricsLRC     string
+	DecryptionKey string
+}
+
+func buildDownloadSuccessResponse(
+	req DownloadRequest,
+	result DownloadResult,
+	service string,
+	message string,
+	filePath string,
+	alreadyExists bool,
+) DownloadResponse {
+	title := result.Title
+	if title == "" {
+		title = req.TrackName
+	}
+
+	artist := result.Artist
+	if artist == "" {
+		artist = req.ArtistName
+	}
+
+	album := result.Album
+	if album == "" {
+		album = req.AlbumName
+	}
+
+	releaseDate := result.ReleaseDate
+	if releaseDate == "" {
+		releaseDate = req.ReleaseDate
+	}
+
+	trackNumber := result.TrackNumber
+	if trackNumber == 0 {
+		trackNumber = req.TrackNumber
+	}
+
+	discNumber := result.DiscNumber
+	if discNumber == 0 {
+		discNumber = req.DiscNumber
+	}
+
+	isrc := result.ISRC
+	if isrc == "" {
+		isrc = req.ISRC
+	}
+
+	genre := result.Genre
+	if genre == "" {
+		genre = req.Genre
+	}
+
+	label := result.Label
+	if label == "" {
+		label = req.Label
+	}
+
+	copyright := result.Copyright
+	if copyright == "" {
+		copyright = req.Copyright
+	}
+
+	return DownloadResponse{
+		Success:          true,
+		Message:          message,
+		FilePath:         filePath,
+		AlreadyExists:    alreadyExists,
+		ActualBitDepth:   result.BitDepth,
+		ActualSampleRate: result.SampleRate,
+		Service:          service,
+		Title:            title,
+		Artist:           artist,
+		Album:            album,
+		AlbumArtist:      req.AlbumArtist,
+		ReleaseDate:      releaseDate,
+		TrackNumber:      trackNumber,
+		DiscNumber:       discNumber,
+		ISRC:             isrc,
+		CoverURL:         req.CoverURL,
+		Genre:            genre,
+		Label:            label,
+		Copyright:        copyright,
+		LyricsLRC:        result.LyricsLRC,
+		DecryptionKey:    result.DecryptionKey,
+	}
+}
+
+func shouldSkipQualityProbe(filePath string) bool {
+	path := strings.TrimSpace(filePath)
+	if path == "" {
+		return true
+	}
+	if strings.HasPrefix(path, "/proc/self/fd/") {
+		return true
+	}
+	// Content URI and other non-filesystem schemes cannot be read directly by os.Open.
+	if strings.Contains(path, "://") {
+		return true
+	}
+	return false
+}
+
+func enrichResultQualityFromFile(result *DownloadResult) {
+	if result == nil {
+		return
+	}
+
+	path := strings.TrimSpace(result.FilePath)
+	if shouldSkipQualityProbe(path) {
+		if strings.HasPrefix(path, "/proc/self/fd/") {
+			LogDebug("Download", "Skipping quality probe for ephemeral SAF FD output: %s", path)
+		}
+		return
+	}
+
+	quality, qErr := GetAudioQuality(path)
+	if qErr == nil {
+		result.BitDepth = quality.BitDepth
+		result.SampleRate = quality.SampleRate
+		GoLog("[Download] Actual quality from file: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
+		return
+	}
+
+	LogDebug("Download", "Post-download quality probe unavailable for %s: %v", path, qErr)
+}
+
+func enrichRequestExtendedMetadata(req *DownloadRequest) {
+	if req == nil {
+		return
+	}
+
+	if req.ISRC == "" || (req.Genre != "" && req.Label != "") {
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	deezerClient := GetDeezerClient()
+	extMeta, err := deezerClient.GetExtendedMetadataByISRC(ctx, req.ISRC)
+	if err != nil || extMeta == nil {
+		if err != nil {
+			GoLog("[DownloadWithFallback] Failed to get extended metadata from Deezer: %v\n", err)
+		}
+		return
+	}
+
+	if req.Genre == "" && extMeta.Genre != "" {
+		req.Genre = extMeta.Genre
+	}
+	if req.Label == "" && extMeta.Label != "" {
+		req.Label = extMeta.Label
+	}
+	if req.Genre != "" || req.Label != "" {
+		GoLog("[DownloadWithFallback] Extended metadata ready: genre=%s, label=%s\n", req.Genre, req.Label)
+	}
 }
 
 func DownloadTrack(requestJSON string) (string, error) {
@@ -210,6 +392,8 @@ func DownloadTrack(requestJSON string) (string, error) {
 		AddAllowedDownloadDir(req.OutputDir)
 	}
 
+	enrichRequestExtendedMetadata(&req)
+
 	var result DownloadResult
 	var err error
 
@@ -254,17 +438,18 @@ func DownloadTrack(requestJSON string) (string, error) {
 		amazonResult, amazonErr := downloadFromAmazon(req)
 		if amazonErr == nil {
 			result = DownloadResult{
-				FilePath:    amazonResult.FilePath,
-				BitDepth:    amazonResult.BitDepth,
-				SampleRate:  amazonResult.SampleRate,
-				Title:       amazonResult.Title,
-				Artist:      amazonResult.Artist,
-				Album:       amazonResult.Album,
-				ReleaseDate: amazonResult.ReleaseDate,
-				TrackNumber: amazonResult.TrackNumber,
-				DiscNumber:  amazonResult.DiscNumber,
-				ISRC:        amazonResult.ISRC,
-				LyricsLRC:   amazonResult.LyricsLRC,
+				FilePath:      amazonResult.FilePath,
+				BitDepth:      amazonResult.BitDepth,
+				SampleRate:    amazonResult.SampleRate,
+				Title:         amazonResult.Title,
+				Artist:        amazonResult.Artist,
+				Album:         amazonResult.Album,
+				ReleaseDate:   amazonResult.ReleaseDate,
+				TrackNumber:   amazonResult.TrackNumber,
+				DiscNumber:    amazonResult.DiscNumber,
+				ISRC:          amazonResult.ISRC,
+				LyricsLRC:     amazonResult.LyricsLRC,
+				DecryptionKey: amazonResult.DecryptionKey,
 			}
 		}
 		err = amazonErr
@@ -296,61 +481,76 @@ func DownloadTrack(requestJSON string) (string, error) {
 
 	if len(result.FilePath) > 7 && result.FilePath[:7] == "EXISTS:" {
 		actualPath := result.FilePath[7:]
-		quality, qErr := GetAudioQuality(actualPath)
-		if qErr == nil {
-			result.BitDepth = quality.BitDepth
-			result.SampleRate = quality.SampleRate
-		}
-		resp := DownloadResponse{
-			Success:          true,
-			Message:          "File already exists",
-			FilePath:         actualPath,
-			AlreadyExists:    true,
-			ActualBitDepth:   result.BitDepth,
-			ActualSampleRate: result.SampleRate,
-			Service:          req.Service,
-			Title:            result.Title,
-			Artist:           result.Artist,
-			Album:            result.Album,
-			ReleaseDate:      result.ReleaseDate,
-			TrackNumber:      result.TrackNumber,
-			DiscNumber:       result.DiscNumber,
-			ISRC:             result.ISRC,
-		}
+		result.FilePath = actualPath
+		enrichResultQualityFromFile(&result)
+		resp := buildDownloadSuccessResponse(
+			req,
+			result,
+			req.Service,
+			"File already exists",
+			actualPath,
+			true,
+		)
 		jsonBytes, _ := json.Marshal(resp)
 		return string(jsonBytes), nil
 	}
 
-	quality, qErr := GetAudioQuality(result.FilePath)
-	if qErr == nil {
-		result.BitDepth = quality.BitDepth
-		result.SampleRate = quality.SampleRate
-		GoLog("[Download] Actual quality from file: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
-	} else {
-		GoLog("[Download] Could not read quality from file: %v\n", qErr)
-	}
+	enrichResultQualityFromFile(&result)
 
-	resp := DownloadResponse{
-		Success:          true,
-		Message:          "Download complete",
-		FilePath:         result.FilePath,
-		ActualBitDepth:   result.BitDepth,
-		ActualSampleRate: result.SampleRate,
-		Service:          req.Service,
-		Title:            result.Title,
-		Artist:           result.Artist,
-		Album:            result.Album,
-		ReleaseDate:      result.ReleaseDate,
-		TrackNumber:      result.TrackNumber,
-		DiscNumber:       result.DiscNumber,
-		ISRC:             result.ISRC,
-		LyricsLRC:        result.LyricsLRC,
-	}
+	resp := buildDownloadSuccessResponse(
+		req,
+		result,
+		req.Service,
+		"Download complete",
+		result.FilePath,
+		false,
+	)
 
 	jsonBytes, _ := json.Marshal(resp)
 	return string(jsonBytes), nil
 }
 
+// DownloadByStrategy routes a unified download request to the appropriate flow.
+// Routing priority: YouTube service > extension fallback > built-in fallback > direct service.
+func DownloadByStrategy(requestJSON string) (string, error) {
+	var req DownloadRequest
+	if err := json.Unmarshal([]byte(requestJSON), &req); err != nil {
+		return errorResponse("Invalid request: " + err.Error())
+	}
+
+	serviceRaw := strings.TrimSpace(req.Service)
+	serviceNormalized := strings.ToLower(serviceRaw)
+
+	normalizedReq := req
+	if serviceNormalized == "youtube" || isBuiltInProvider(serviceNormalized) {
+		normalizedReq.Service = serviceNormalized
+	}
+
+	normalizedBytes, err := json.Marshal(normalizedReq)
+	if err != nil {
+		return errorResponse("Invalid request: " + err.Error())
+	}
+	normalizedJSON := string(normalizedBytes)
+
+	if serviceNormalized == "youtube" {
+		return DownloadFromYouTube(normalizedJSON)
+	}
+
+	if req.UseExtensions {
+		resp, err := DownloadWithExtensionsJSON(normalizedJSON)
+		if err != nil {
+			return errorResponse(err.Error())
+		}
+		return resp, nil
+	}
+
+	if req.UseFallback {
+		return DownloadWithFallback(normalizedJSON)
+	}
+
+	return DownloadTrack(normalizedJSON)
+}
+
 func DownloadWithFallback(requestJSON string) (string, error) {
 	var req DownloadRequest
 	if err := json.Unmarshal([]byte(requestJSON), &req); err != nil {
@@ -369,6 +569,8 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 		AddAllowedDownloadDir(req.OutputDir)
 	}
 
+	enrichRequestExtendedMetadata(&req)
+
 	allServices := []string{"tidal", "qobuz", "amazon"}
 	preferredService := req.Service
 	if preferredService == "" {
@@ -440,17 +642,18 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 			amazonResult, amazonErr := downloadFromAmazon(req)
 			if amazonErr == nil {
 				result = DownloadResult{
-					FilePath:    amazonResult.FilePath,
-					BitDepth:    amazonResult.BitDepth,
-					SampleRate:  amazonResult.SampleRate,
-					Title:       amazonResult.Title,
-					Artist:      amazonResult.Artist,
-					Album:       amazonResult.Album,
-					ReleaseDate: amazonResult.ReleaseDate,
-					TrackNumber: amazonResult.TrackNumber,
-					DiscNumber:  amazonResult.DiscNumber,
-					ISRC:        amazonResult.ISRC,
-					LyricsLRC:   amazonResult.LyricsLRC,
+					FilePath:      amazonResult.FilePath,
+					BitDepth:      amazonResult.BitDepth,
+					SampleRate:    amazonResult.SampleRate,
+					Title:         amazonResult.Title,
+					Artist:        amazonResult.Artist,
+					Album:         amazonResult.Album,
+					ReleaseDate:   amazonResult.ReleaseDate,
+					TrackNumber:   amazonResult.TrackNumber,
+					DiscNumber:    amazonResult.DiscNumber,
+					ISRC:          amazonResult.ISRC,
+					LyricsLRC:     amazonResult.LyricsLRC,
+					DecryptionKey: amazonResult.DecryptionKey,
 				}
 			} else if !errors.Is(amazonErr, ErrDownloadCancelled) {
 				GoLog("[DownloadWithFallback] Amazon error: %v\n", amazonErr)
@@ -465,57 +668,30 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 		if err == nil {
 			if len(result.FilePath) > 7 && result.FilePath[:7] == "EXISTS:" {
 				actualPath := result.FilePath[7:]
-				quality, qErr := GetAudioQuality(actualPath)
-				if qErr == nil {
-					result.BitDepth = quality.BitDepth
-					result.SampleRate = quality.SampleRate
-				}
-				resp := DownloadResponse{
-					Success:          true,
-					Message:          "File already exists",
-					FilePath:         actualPath,
-					AlreadyExists:    true,
-					ActualBitDepth:   result.BitDepth,
-					ActualSampleRate: result.SampleRate,
-					Service:          service,
-					Title:            result.Title,
-					Artist:           result.Artist,
-					Album:            result.Album,
-					ReleaseDate:      result.ReleaseDate,
-					TrackNumber:      result.TrackNumber,
-					DiscNumber:       result.DiscNumber,
-					ISRC:             result.ISRC,
-					LyricsLRC:        result.LyricsLRC,
-				}
+				result.FilePath = actualPath
+				enrichResultQualityFromFile(&result)
+				resp := buildDownloadSuccessResponse(
+					req,
+					result,
+					service,
+					"File already exists",
+					actualPath,
+					true,
+				)
 				jsonBytes, _ := json.Marshal(resp)
 				return string(jsonBytes), nil
 			}
 
-			quality, qErr := GetAudioQuality(result.FilePath)
-			if qErr == nil {
-				result.BitDepth = quality.BitDepth
-				result.SampleRate = quality.SampleRate
-				GoLog("[Download] Actual quality from file: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
-			} else {
-				GoLog("[Download] Could not read quality from file: %v\n", qErr)
-			}
+			enrichResultQualityFromFile(&result)
 
-			resp := DownloadResponse{
-				Success:          true,
-				Message:          "Downloaded from " + service,
-				FilePath:         result.FilePath,
-				ActualBitDepth:   result.BitDepth,
-				ActualSampleRate: result.SampleRate,
-				Service:          service,
-				Title:            result.Title,
-				Artist:           result.Artist,
-				Album:            result.Album,
-				ReleaseDate:      result.ReleaseDate,
-				TrackNumber:      result.TrackNumber,
-				DiscNumber:       result.DiscNumber,
-				ISRC:             result.ISRC,
-				LyricsLRC:        result.LyricsLRC,
-			}
+			resp := buildDownloadSuccessResponse(
+				req,
+				result,
+				service,
+				"Downloaded from "+service,
+				result.FilePath,
+				false,
+			)
 			jsonBytes, _ := json.Marshal(resp)
 			return string(jsonBytes), nil
 		}
@@ -622,6 +798,7 @@ func ReadFileMetadata(filePath string) (string, error) {
 			result["track_number"] = meta.TrackNumber
 			result["disc_number"] = meta.DiscNumber
 			result["isrc"] = meta.ISRC
+			result["lyrics"] = meta.Lyrics
 			result["genre"] = meta.Genre
 			result["composer"] = meta.Composer
 			result["comment"] = meta.Comment
@@ -646,6 +823,7 @@ func ReadFileMetadata(filePath string) (string, error) {
 			result["track_number"] = meta.TrackNumber
 			result["disc_number"] = meta.DiscNumber
 			result["isrc"] = meta.ISRC
+			result["lyrics"] = meta.Lyrics
 			result["genre"] = meta.Genre
 			result["composer"] = meta.Composer
 			result["comment"] = meta.Comment
@@ -678,6 +856,7 @@ func EditFileMetadata(filePath, metadataJSON string) (string, error) {
 
 	lower := strings.ToLower(filePath)
 	isFlac := strings.HasSuffix(lower, ".flac")
+	coverPath := strings.TrimSpace(fields["cover_path"])
 
 	if isFlac {
 		trackNum := 0
@@ -705,7 +884,7 @@ func EditFileMetadata(filePath, metadataJSON string) (string, error) {
 			Comment:     fields["comment"],
 		}
 
-		if err := EmbedMetadata(filePath, meta, ""); err != nil {
+		if err := EmbedMetadata(filePath, meta, coverPath); err != nil {
 			return "", fmt.Errorf("failed to write FLAC metadata: %w", err)
 		}
 
@@ -829,6 +1008,64 @@ func GetLyricsLRC(spotifyID, trackName, artistName string, filePath string, dura
 	return lrcContent, nil
 }
 
+func GetLyricsLRCWithSource(spotifyID, trackName, artistName string, filePath string, durationMs int64) (string, error) {
+	if filePath != "" {
+		lyrics, err := ExtractLyrics(filePath)
+		if err == nil && lyrics != "" {
+			result := map[string]interface{}{
+				"lyrics":       lyrics,
+				"source":       "Embedded",
+				"sync_type":    "EMBEDDED",
+				"instrumental": false,
+			}
+			jsonBytes, err := json.Marshal(result)
+			if err != nil {
+				return "", err
+			}
+			return string(jsonBytes), nil
+		}
+
+		result := map[string]interface{}{
+			"lyrics":       "",
+			"source":       "",
+			"sync_type":    "",
+			"instrumental": false,
+		}
+		jsonBytes, err := json.Marshal(result)
+		if err != nil {
+			return "", err
+		}
+		return string(jsonBytes), nil
+	}
+
+	client := NewLyricsClient()
+	durationSec := float64(durationMs) / 1000.0
+	lyricsData, err := client.FetchLyricsAllSources(spotifyID, trackName, artistName, durationSec)
+	if err != nil {
+		return "", err
+	}
+
+	lrcContent := ""
+	if lyricsData.Instrumental {
+		lrcContent = "[instrumental:true]"
+	} else {
+		lrcContent = convertToLRCWithMetadata(lyricsData, trackName, artistName)
+	}
+
+	result := map[string]interface{}{
+		"lyrics":       lrcContent,
+		"source":       lyricsData.Source,
+		"sync_type":    lyricsData.SyncType,
+		"instrumental": lyricsData.Instrumental,
+	}
+	jsonBytes, err := json.Marshal(result)
+	if err != nil {
+		return "", err
+	}
+
+	return string(jsonBytes), nil
+}
+
 func EmbedLyricsToFile(filePath, lyrics string) (string, error) {
 	err := EmbedLyrics(filePath, lyrics)
 	if err != nil {
@@ -1101,9 +1338,12 @@ func GetSpotifyMetadataWithDeezerFallback(spotifyURL string) (string, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 	defer cancel()
 
+	var spotifyErr error
+
 	client, err := NewSpotifyMetadataClient()
 	if err != nil {
 		LogWarn("Spotify", "Credentials not configured, falling back to Deezer")
+		spotifyErr = err
 	} else {
 		data, err := client.GetFilteredData(ctx, spotifyURL, false, 0)
 		if err == nil {
@@ -1114,28 +1354,81 @@ func GetSpotifyMetadataWithDeezerFallback(spotifyURL string) (string, error) {
 			return string(jsonBytes), nil
 		}
 
-		errStr := strings.ToLower(err.Error())
-		if !strings.Contains(errStr, "429") && !strings.Contains(errStr, "rate") && !strings.Contains(errStr, "limit") {
+		spotifyErr = err
+		if !shouldTrySpotFetchFallback(err) {
 			return "", err
 		}
 	}
 
+	spotFetchData, apiErr := GetSpotifyDataWithAPI(ctx, spotifyURL, DefaultSpotFetchAPIBaseURL)
+	if apiErr == nil {
+		GoLog("[Fallback] Spotify metadata fetched via SpotFetch API\n")
+		jsonBytes, err := json.Marshal(spotFetchData)
+		if err != nil {
+			return "", err
+		}
+		return string(jsonBytes), nil
+	}
+	GoLog("[Fallback] SpotFetch API fallback failed: %v\n", apiErr)
+
 	parsed, parseErr := parseSpotifyURI(spotifyURL)
 	if parseErr != nil {
-		return "", fmt.Errorf("spotify rate limited and failed to parse URL: %w", parseErr)
+		if spotifyErr != nil {
+			return "", fmt.Errorf("spotify failed (%v), SpotFetch fallback failed (%v), and URL parsing failed: %w", spotifyErr, apiErr, parseErr)
+		}
+		return "", fmt.Errorf("SpotFetch fallback failed (%v) and URL parsing failed: %w", apiErr, parseErr)
 	}
 
-	GoLog("[Fallback] Spotify rate limited for %s, trying Deezer...\n", parsed.Type)
+	GoLog("[Fallback] Trying Deezer conversion fallback for %s...\n", parsed.Type)
 
 	if parsed.Type == "track" || parsed.Type == "album" {
 		return ConvertSpotifyToDeezer(parsed.Type, parsed.ID)
 	}
 
 	if parsed.Type == "artist" {
-		return "", fmt.Errorf("spotify rate limited. Artist pages require Spotify API - please try again later")
+		if spotifyErr != nil {
+			return "", fmt.Errorf("spotify metadata unavailable (%v) and SpotFetch fallback failed (%v). Artist pages require Spotify/SpotFetch API", spotifyErr, apiErr)
+		}
+		return "", fmt.Errorf("SpotFetch fallback failed (%v). Artist pages require Spotify/SpotFetch API", apiErr)
 	}
 
-	return "", fmt.Errorf("spotify rate limited. Playlists are user-specific and require Spotify API")
+	if spotifyErr != nil {
+		return "", fmt.Errorf("spotify metadata unavailable (%v), SpotFetch fallback failed (%v), and Deezer conversion is unavailable for playlists", spotifyErr, apiErr)
+	}
+	return "", fmt.Errorf("SpotFetch fallback failed (%v), and Deezer conversion is unavailable for playlists", apiErr)
+}
+
+func shouldTrySpotFetchFallback(err error) bool {
+	if err == nil {
+		return false
+	}
+	if errors.Is(err, ErrNoSpotifyCredentials) {
+		return true
+	}
+
+	errStr := strings.ToLower(err.Error())
+	indicators := []string{
+		"429",
+		"rate",
+		"limit",
+		"403",
+		"forbidden",
+		"401",
+		"unauthorized",
+		"timeout",
+		"connection",
+		"spotify error",
+		"access token",
+		"client token",
+		"eof",
+	}
+
+	for _, indicator := range indicators {
+		if strings.Contains(errStr, indicator) {
+			return true
+		}
+	}
+	return false
 }
 
 func CheckAvailabilityFromDeezerID(deezerTrackID string) (string, error) {
@@ -1266,6 +1559,10 @@ func DownloadFromYouTube(requestJSON string) (string, error) {
 		DiscNumber:  youtubeResult.DiscNumber,
 		ISRC:        youtubeResult.ISRC,
 		LyricsLRC:   youtubeResult.LyricsLRC,
+		CoverURL:    req.CoverURL,
+		Genre:       req.Genre,
+		Label:       req.Label,
+		Copyright:   req.Copyright,
 	}
 
 	jsonBytes, _ := json.Marshal(resp)
@@ -1360,6 +1657,62 @@ func FetchAndSaveLyrics(trackName, artistName, spotifyID string, durationMs int6
 	return nil
 }
 
+// ==================== LYRICS PROVIDER SETTINGS ====================
+
+// SetLyricsProvidersJSON sets the lyrics provider order from a JSON array of provider IDs.
+func SetLyricsProvidersJSON(providersJSON string) error {
+	var providers []string
+	if err := json.Unmarshal([]byte(providersJSON), &providers); err != nil {
+		return err
+	}
+
+	SetLyricsProviderOrder(providers)
+	return nil
+}
+
+// GetLyricsProvidersJSON returns the current lyrics provider order as JSON.
+func GetLyricsProvidersJSON() (string, error) {
+	providers := GetLyricsProviderOrder()
+	jsonBytes, err := json.Marshal(providers)
+	if err != nil {
+		return "", err
+	}
+	return string(jsonBytes), nil
+}
+
+// GetAvailableLyricsProvidersJSON returns metadata about all available lyrics providers.
+func GetAvailableLyricsProvidersJSON() (string, error) {
+	providers := GetAvailableLyricsProviders()
+	jsonBytes, err := json.Marshal(providers)
+	if err != nil {
+		return "", err
+	}
+	return string(jsonBytes), nil
+}
+
+// SetLyricsFetchOptionsJSON sets lyrics provider fetch options.
+func SetLyricsFetchOptionsJSON(optionsJSON string) error {
+	opts := GetLyricsFetchOptions()
+	if strings.TrimSpace(optionsJSON) != "" {
+		if err := json.Unmarshal([]byte(optionsJSON), &opts); err != nil {
+			return err
+		}
+	}
+
+	SetLyricsFetchOptions(opts)
+	return nil
+}
+
+// GetLyricsFetchOptionsJSON returns current lyrics provider fetch options.
+func GetLyricsFetchOptionsJSON() (string, error) {
+	opts := GetLyricsFetchOptions()
+	jsonBytes, err := json.Marshal(opts)
+	if err != nil {
+		return "", err
+	}
+	return string(jsonBytes), nil
+}
+
 // ReEnrichFile re-embeds metadata, cover art, and lyrics into an existing audio file.
 // When search_online is true, searches Spotify/Deezer by track name + artist to fetch
 // complete metadata from the internet before embedding.
@@ -1528,19 +1881,47 @@ func ReEnrichFile(requestJSON string) (string, error) {
 	GoLog("[ReEnrich] track=%d, disc=%d, date=%s, isrc=%s, genre=%s, label=%s\n",
 		req.TrackNumber, req.DiscNumber, req.ReleaseDate, req.ISRC, req.Genre, req.Label)
 
+	lower := strings.ToLower(req.FilePath)
+	isFlac := strings.HasSuffix(lower, ".flac")
+
 	// Download cover art to temp file
 	var coverTempPath string
+	var coverDataBytes []byte
 	if req.CoverURL != "" {
 		coverData, err := downloadCoverToMemory(req.CoverURL, req.MaxQuality)
 		if err != nil {
 			GoLog("[ReEnrich] Failed to download cover: %v\n", err)
 		} else {
-			tmpFile, err := os.CreateTemp("", "reenrich_cover_*.jpg")
-			if err == nil {
-				coverTempPath = tmpFile.Name()
-				tmpFile.Write(coverData)
-				tmpFile.Close()
-				GoLog("[ReEnrich] Cover downloaded: %d KB\n", len(coverData)/1024)
+			coverDataBytes = coverData
+			GoLog("[ReEnrich] Cover downloaded: %d KB\n", len(coverData)/1024)
+			// MP3/Opus requires a real image file path for Dart FFmpeg.
+			// FLAC uses in-memory embed and does not require temp files.
+			if !isFlac {
+				tmpFile, err := os.CreateTemp("", "reenrich_cover_*.jpg")
+				if err != nil {
+					fallbackDir := filepath.Dir(req.FilePath)
+					if fallbackDir == "" || fallbackDir == "." {
+						GoLog("[ReEnrich] Failed to create cover temp file: %v\n", err)
+					} else {
+						tmpFile, err = os.CreateTemp(fallbackDir, "reenrich_cover_*.jpg")
+						if err != nil {
+							GoLog("[ReEnrich] Failed to create cover temp file (fallback dir %s): %v\n", fallbackDir, err)
+						}
+					}
+				}
+				if err == nil && tmpFile != nil {
+					coverTempPath = tmpFile.Name()
+					if _, writeErr := tmpFile.Write(coverData); writeErr != nil {
+						GoLog("[ReEnrich] Failed writing cover temp file: %v\n", writeErr)
+						tmpFile.Close()
+						os.Remove(coverTempPath)
+						coverTempPath = ""
+					} else if closeErr := tmpFile.Close(); closeErr != nil {
+						GoLog("[ReEnrich] Failed closing cover temp file: %v\n", closeErr)
+						os.Remove(coverTempPath)
+						coverTempPath = ""
+					}
+				}
 			}
 		}
 	}
@@ -1570,9 +1951,6 @@ func ReEnrichFile(requestJSON string) (string, error) {
 		}
 	}
 
-	lower := strings.ToLower(req.FilePath)
-	isFlac := strings.HasSuffix(lower, ".flac")
-
 	// Build enriched metadata response for Dart (includes online search results)
 	enrichedMeta := map[string]interface{}{
 		"track_name":   req.TrackName,
@@ -1608,8 +1986,24 @@ func ReEnrichFile(requestJSON string) (string, error) {
 			Lyrics:      lyricsLRC,
 		}
 
-		if err := EmbedMetadata(req.FilePath, metadata, coverTempPath); err != nil {
-			return "", fmt.Errorf("failed to embed metadata: %w", err)
+		if len(coverDataBytes) > 0 {
+			if err := EmbedMetadataWithCoverData(req.FilePath, metadata, coverDataBytes); err != nil {
+				return "", fmt.Errorf("failed to embed metadata with cover: %w", err)
+			}
+		} else {
+			if err := EmbedMetadata(req.FilePath, metadata, ""); err != nil {
+				return "", fmt.Errorf("failed to embed metadata: %w", err)
+			}
+		}
+		if len(coverDataBytes) > 0 {
+			embeddedCover, err := ExtractCoverArt(req.FilePath)
+			if err != nil || len(embeddedCover) == 0 {
+				if err != nil {
+					return "", fmt.Errorf("metadata embedded but cover verification failed: %w", err)
+				}
+				return "", fmt.Errorf("metadata embedded but cover verification failed: empty embedded cover")
+			}
+			GoLog("[ReEnrich] Cover verified after embed (%d bytes)\n", len(embeddedCover))
 		}
 
 		GoLog("[ReEnrich] FLAC metadata embedded successfully\n")
@@ -2699,14 +3093,26 @@ func GetStoreCategoriesJSON() (string, error) {
 	return string(jsonBytes), nil
 }
 
+func buildStoreExtensionDestPath(destDir, extensionID string) (string, error) {
+	if strings.TrimSpace(extensionID) == "" {
+		return "", fmt.Errorf("invalid extension id")
+	}
+
+	safeExtensionID := sanitizeFilename(extensionID)
+	return filepath.Join(destDir, safeExtensionID+".spotiflac-ext"), nil
+}
+
 func DownloadStoreExtensionJSON(extensionID, destDir string) (string, error) {
 	store := GetExtensionStore()
 	if store == nil {
 		return "", fmt.Errorf("extension store not initialized")
 	}
 
-	destPath := fmt.Sprintf("%s/%s.spotiflac-ext", destDir, extensionID)
-	err := store.DownloadExtension(extensionID, destPath)
+	destPath, err := buildStoreExtensionDestPath(destDir, extensionID)
+	if err != nil {
+		return "", err
+	}
+	err = store.DownloadExtension(extensionID, destPath)
 	if err != nil {
 		return "", err
 	}

go_backend/extension_manager.go

@@ -713,6 +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"`
@@ -770,6 +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,

go_backend/extension_manifest.go

@@ -12,6 +12,7 @@ type ExtensionType string
 const (
 	ExtensionTypeMetadataProvider ExtensionType = "metadata_provider"
 	ExtensionTypeDownloadProvider ExtensionType = "download_provider"
+	ExtensionTypeLyricsProvider   ExtensionType = "lyrics_provider"
 )
 
 type SettingType string
@@ -167,10 +168,10 @@ 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),
 			}
 		}
 	}
@@ -226,6 +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 {

go_backend/extension_providers.go

@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"path/filepath"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -1082,16 +1083,18 @@ func tryBuiltInProvider(providerID string, req DownloadRequest) (*DownloadRespon
 		amazonResult, amazonErr := downloadFromAmazon(req)
 		if amazonErr == nil {
 			result = DownloadResult{
-				FilePath:    amazonResult.FilePath,
-				BitDepth:    amazonResult.BitDepth,
-				SampleRate:  amazonResult.SampleRate,
-				Title:       amazonResult.Title,
-				Artist:      amazonResult.Artist,
-				Album:       amazonResult.Album,
-				ReleaseDate: amazonResult.ReleaseDate,
-				TrackNumber: amazonResult.TrackNumber,
-				DiscNumber:  amazonResult.DiscNumber,
-				ISRC:        amazonResult.ISRC,
+				FilePath:      amazonResult.FilePath,
+				BitDepth:      amazonResult.BitDepth,
+				SampleRate:    amazonResult.SampleRate,
+				Title:         amazonResult.Title,
+				Artist:        amazonResult.Artist,
+				Album:         amazonResult.Album,
+				ReleaseDate:   amazonResult.ReleaseDate,
+				TrackNumber:   amazonResult.TrackNumber,
+				DiscNumber:    amazonResult.DiscNumber,
+				ISRC:          amazonResult.ISRC,
+				LyricsLRC:     amazonResult.LyricsLRC,
+				DecryptionKey: amazonResult.DecryptionKey,
 			}
 		}
 		err = amazonErr
@@ -1119,6 +1122,8 @@ func tryBuiltInProvider(providerID string, req DownloadRequest) (*DownloadRespon
 		Genre:            req.Genre,
 		Label:            req.Label,
 		Copyright:        req.Copyright,
+		LyricsLRC:        result.LyricsLRC,
+		DecryptionKey:    result.DecryptionKey,
 	}, nil
 }
 
@@ -1132,8 +1137,13 @@ func buildOutputPath(req DownloadRequest) string {
 		"artist":       req.ArtistName,
 		"album":        req.AlbumName,
 		"album_artist": req.AlbumArtist,
+		"track":        req.TrackNumber,
 		"track_number": req.TrackNumber,
+		"disc":         req.DiscNumber,
 		"disc_number":  req.DiscNumber,
+		"year":         extractYear(req.ReleaseDate),
+		"date":         req.ReleaseDate,
+		"release_date": req.ReleaseDate,
 		"isrc":         req.ISRC,
 	}
 
@@ -1164,16 +1174,30 @@ func (p *ExtensionProviderWrapper) CustomSearch(query string, options map[string
 	p.extension.VMMu.Lock()
 	defer p.extension.VMMu.Unlock()
 
-	optionsJSON, _ := json.Marshal(options)
+	if options == nil {
+		options = map[string]interface{}{}
+	}
 
-	script := fmt.Sprintf(`
+	// Avoid embedding user input directly into JS source. Some inputs can trigger
+	// parser/runtime edge cases on specific devices/Goja builds.
+	const queryVar = "__sf_custom_search_query"
+	const optionsVar = "__sf_custom_search_options"
+	global := p.vm.GlobalObject()
+	_ = global.Set(queryVar, query)
+	_ = global.Set(optionsVar, options)
+	defer func() {
+		global.Delete(queryVar)
+		global.Delete(optionsVar)
+	}()
+
+	const script = `
 		(function() {
 			if (typeof extension !== 'undefined' && typeof extension.customSearch === 'function') {
-				return extension.customSearch(%q, %s);
+				return extension.customSearch(__sf_custom_search_query, __sf_custom_search_options);
 			}
 			return null;
 		})()
-	`, query, string(optionsJSON))
+	`
 
 	result, err := RunWithTimeoutAndRecover(p.vm, script, DefaultJSTimeout)
 	if err != nil {
@@ -1358,12 +1382,12 @@ type PostProcessResult struct {
 }
 
 type PostProcessInput struct {
-	Path    string `json:"path,omitempty"`
-	URI     string `json:"uri,omitempty"`
-	Name    string `json:"name,omitempty"`
+	Path     string `json:"path,omitempty"`
+	URI      string `json:"uri,omitempty"`
+	Name     string `json:"name,omitempty"`
 	MimeType string `json:"mime_type,omitempty"`
-	Size    int64  `json:"size,omitempty"`
-	IsSAF   bool   `json:"is_saf,omitempty"`
+	Size     int64  `json:"size,omitempty"`
+	IsSAF    bool   `json:"is_saf,omitempty"`
 }
 
 const PostProcessTimeout = 2 * time.Minute
@@ -1676,3 +1700,140 @@ func (m *ExtensionManager) RunPostProcessingV2(input PostProcessInput, metadata
 
 	return &PostProcessResult{Success: true, NewFilePath: currentInput.Path, NewFileURI: currentInput.URI}, nil
 }
+
+// ==================== Lyrics Provider ====================
+
+// ExtLyricsResult represents lyrics data returned from an extension
+type ExtLyricsResult struct {
+	Lines        []ExtLyricsLine `json:"lines"`
+	SyncType     string          `json:"syncType"`
+	Instrumental bool            `json:"instrumental"`
+	PlainLyrics  string          `json:"plainLyrics"`
+	Provider     string          `json:"provider"`
+}
+
+type ExtLyricsLine struct {
+	StartTimeMs int64  `json:"startTimeMs"`
+	Words       string `json:"words"`
+	EndTimeMs   int64  `json:"endTimeMs"`
+}
+
+// FetchLyrics calls the extension's fetchLyrics function
+func (p *ExtensionProviderWrapper) FetchLyrics(trackName, artistName, albumName string, durationSec float64) (*LyricsResponse, error) {
+	if !p.extension.Manifest.IsLyricsProvider() {
+		return nil, fmt.Errorf("extension '%s' is not a lyrics provider", p.extension.ID)
+	}
+
+	if !p.extension.Enabled {
+		return nil, fmt.Errorf("extension '%s' is disabled", p.extension.ID)
+	}
+
+	p.extension.VMMu.Lock()
+	defer p.extension.VMMu.Unlock()
+
+	// Use global variables to avoid JS injection issues with special characters in track/artist names
+	const trackVar = "__sf_lyrics_track"
+	const artistVar = "__sf_lyrics_artist"
+	const albumVar = "__sf_lyrics_album"
+	const durationVar = "__sf_lyrics_duration"
+	global := p.vm.GlobalObject()
+	_ = global.Set(trackVar, trackName)
+	_ = global.Set(artistVar, artistName)
+	_ = global.Set(albumVar, albumName)
+	_ = global.Set(durationVar, durationSec)
+	defer func() {
+		global.Delete(trackVar)
+		global.Delete(artistVar)
+		global.Delete(albumVar)
+		global.Delete(durationVar)
+	}()
+
+	const script = `
+		(function() {
+			if (typeof extension !== 'undefined' && typeof extension.fetchLyrics === 'function') {
+				return extension.fetchLyrics(__sf_lyrics_track, __sf_lyrics_artist, __sf_lyrics_album, __sf_lyrics_duration);
+			}
+			return null;
+		})()
+	`
+
+	result, err := RunWithTimeoutAndRecover(p.vm, script, DefaultJSTimeout)
+	if err != nil {
+		if IsTimeoutError(err) {
+			return nil, fmt.Errorf("fetchLyrics timeout: extension took too long to respond")
+		}
+		return nil, fmt.Errorf("fetchLyrics failed: %w", err)
+	}
+
+	if result == nil || goja.IsUndefined(result) || goja.IsNull(result) {
+		return nil, fmt.Errorf("fetchLyrics returned null")
+	}
+
+	exported := result.Export()
+	jsonBytes, err := json.Marshal(exported)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal lyrics result: %w", err)
+	}
+
+	var extResult ExtLyricsResult
+	if err := json.Unmarshal(jsonBytes, &extResult); err != nil {
+		return nil, fmt.Errorf("failed to parse lyrics result: %w", err)
+	}
+
+	// Convert ExtLyricsResult to LyricsResponse
+	response := &LyricsResponse{
+		SyncType:     extResult.SyncType,
+		Instrumental: extResult.Instrumental,
+		PlainLyrics:  extResult.PlainLyrics,
+		Provider:     extResult.Provider,
+		Source:       "Extension: " + p.extension.ID,
+	}
+
+	if response.Provider == "" {
+		response.Provider = p.extension.Manifest.DisplayName
+	}
+
+	for _, line := range extResult.Lines {
+		response.Lines = append(response.Lines, LyricsLine{
+			StartTimeMs: line.StartTimeMs,
+			Words:       line.Words,
+			EndTimeMs:   line.EndTimeMs,
+		})
+	}
+
+	// If the extension provided plainLyrics but no lines, parse them as unsynced
+	if len(response.Lines) == 0 && response.PlainLyrics != "" && !response.Instrumental {
+		response.SyncType = "UNSYNCED"
+		for _, line := range strings.Split(response.PlainLyrics, "\n") {
+			if strings.TrimSpace(line) != "" {
+				response.Lines = append(response.Lines, LyricsLine{
+					StartTimeMs: 0,
+					Words:       line,
+					EndTimeMs:   0,
+				})
+			}
+		}
+	}
+
+	return response, nil
+}
+
+// GetLyricsProviders returns all enabled extensions that provide lyrics
+func (m *ExtensionManager) GetLyricsProviders() []*ExtensionProviderWrapper {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	var providers []*ExtensionProviderWrapper
+	for _, ext := range m.extensions {
+		if ext.Enabled && ext.Manifest.IsLyricsProvider() && ext.Error == "" {
+			providers = append(providers, NewExtensionProviderWrapper(ext))
+		}
+	}
+
+	// Keep a deterministic order so provider selection is stable across runs.
+	sort.Slice(providers, func(i, j int) bool {
+		return providers[i].extension.ID < providers[j].extension.ID
+	})
+
+	return providers
+}

go_backend/extension_runtime_auth.go

@@ -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,
@@ -273,6 +317,12 @@ 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(),
+		})
+	}
 
 	scope, _ := config["scope"].(string)
 	extraParams, _ := config["extraParams"].(map[string]interface{})
@@ -331,7 +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,
@@ -441,13 +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,
 		})
 	}
 
@@ -468,7 +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,
 		})
 	}
 

go_backend/extension_runtime_http.go

@@ -32,6 +32,9 @@ func (r *ExtensionRuntime) validateDomain(urlStr string) error {
 	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 == "" {

go_backend/extension_runtime_storage.go

@@ -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 {

go_backend/extension_timeout.go

@@ -4,6 +4,7 @@ package gobackend
 import (
 	"context"
 	"fmt"
+	"runtime/debug"
 	"sync"
 	"time"
 
@@ -49,6 +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)}
 				}
 			}

go_backend/filename.go

@@ -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]

go_backend/filename_test.go

@@ -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)
+	}
+}

go_backend/go.mod

@@ -2,7 +2,7 @@ module github.com/zarz/spotiflac_android/go_backend
 
 go 1.25.0
 
-toolchain go1.25.7
+toolchain go1.26.0
 
 require (
 	github.com/dop251/goja v0.0.0-20260106131823-651366fbe6e3
@@ -10,8 +10,8 @@ require (
 	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 v0.0.0-20260204172633-1dceadbbeea3
-	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
 )

go_backend/go.sum

@@ -30,20 +30,34 @@ github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOf
 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/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=

go_backend/library_scan.go

@@ -28,6 +28,7 @@ type LibraryScanResult struct {
 	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"`
 }
@@ -289,8 +290,11 @@ func scanMP3File(filePath string, result *LibraryScanResult) (*LibraryScanResult
 	quality, err := GetMP3Quality(filePath)
 	if err == nil {
 		result.SampleRate = quality.SampleRate
-		result.BitDepth = quality.BitDepth
+		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 == "" {
@@ -326,8 +330,11 @@ func scanOggFile(filePath string, result *LibraryScanResult) (*LibraryScanResult
 	quality, err := GetOggQuality(filePath)
 	if err == nil {
 		result.SampleRate = quality.SampleRate
-		result.BitDepth = quality.BitDepth
+		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 == "" {

go_backend/logbuffer.go

@@ -3,6 +3,7 @@ package gobackend
 import (
 	"encoding/json"
 	"fmt"
+	"regexp"
 	"strings"
 	"sync"
 	"time"
@@ -30,8 +31,22 @@ const (
 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._~+/\-]+=*`)
 )
 
+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{
@@ -71,6 +86,7 @@ func (lb *LogBuffer) Add(level, tag, message string) {
 		return
 	}
 
+	message = sanitizeSensitiveLogText(message)
 	message = truncateLogMessage(message)
 
 	entry := LogEntry{

go_backend/lyrics.go

@@ -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 {

go_backend/lyrics_apple.go

@@ -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")
+}

go_backend/lyrics_musixmatch.go

@@ -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")
+}

go_backend/lyrics_netease.go

@@ -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
+}

go_backend/lyrics_qqmusic.go

@@ -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")
+}

go_backend/metadata.go

@@ -4,8 +4,13 @@ import (
 	"bytes"
 	"encoding/binary"
 	"fmt"
+	stdimage "image"
+	_ "image/gif"
+	_ "image/jpeg"
+	_ "image/png"
 	"io"
 	"os"
+	"path/filepath"
 	"strconv"
 	"strings"
 
@@ -14,6 +19,82 @@ import (
 	"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
@@ -127,19 +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)
@@ -238,19 +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)
@@ -475,33 +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"`

go_backend/qobuz.go

@@ -419,7 +419,7 @@ func extractQobuzDownloadURLFromBody(body []byte) (string, error) {
 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")
 
@@ -428,6 +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 {
@@ -1178,6 +1180,7 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		"album":  req.AlbumName,
 		"track":  req.TrackNumber,
 		"year":   extractYear(req.ReleaseDate),
+		"date":   req.ReleaseDate,
 		"disc":   req.DiscNumber,
 	})
 	var outputPath string

go_backend/security_hardening_test.go

@@ -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")
+	}
+}

go_backend/spotfetch_api.go

@@ -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)
+	}
+}

go_backend/tidal.go

@@ -1609,6 +1609,7 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		"album":  req.AlbumName,
 		"track":  req.TrackNumber,
 		"year":   extractYear(req.ReleaseDate),
+		"date":   req.ReleaseDate,
 		"disc":   req.DiscNumber,
 	})
 

go_backend/youtube.go

@@ -500,6 +500,7 @@ func downloadFromYouTube(req DownloadRequest) (YouTubeDownloadResult, error) {
 		"album":  req.AlbumName,
 		"track":  req.TrackNumber,
 		"year":   extractYear(req.ReleaseDate),
+		"date":   req.ReleaseDate,
 		"disc":   req.DiscNumber,
 	})
 	filename = sanitizeFilename(filename) + ext

ios/Podfile

@@ -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

ios/Runner/AppDelegate.swift

@@ -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]
@@ -479,12 +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
@@ -492,6 +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]
@@ -754,6 +794,36 @@ import Gobackend  // Import Go framework
             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",

lib/app.dart

@@ -10,9 +10,13 @@ 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 hasCompletedTutorial = ref.watch(settingsProvider.select((s) => s.hasCompletedTutorial));
-  
+  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) {
@@ -22,18 +26,12 @@ final _routerProvider = Provider<GoRouter>((ref) {
   } else {
     initialLocation = '/';
   }
-  
+
   return GoRouter(
     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()),
       GoRoute(
         path: '/tutorial',
         builder: (context, state) => const TutorialScreen(),
@@ -43,13 +41,18 @@ final _routerProvider = Provider<GoRouter>((ref) {
 });
 
 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('_')) {
@@ -59,7 +62,7 @@ class SpotiFLACApp extends ConsumerWidget {
         locale = Locale(localeString);
       }
     }
-    
+
     return DynamicColorWrapper(
       builder: (lightTheme, darkTheme, themeMode) {
         return MaterialApp.router(
@@ -68,6 +71,7 @@ class SpotiFLACApp extends ConsumerWidget {
           theme: lightTheme,
           darkTheme: darkTheme,
           themeMode: themeMode,
+          scrollBehavior: scrollBehavior,
           themeAnimationDuration: const Duration(milliseconds: 300),
           themeAnimationCurve: Curves.easeInOut,
           routerConfig: router,

lib/constants/app_info.dart

@@ -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 = '3.6.0';
-  static const String buildNumber = '77';
+  static const String version = '3.6.7';
+  static const String buildNumber = '81';
   static const String fullVersion = '$version+$buildNumber';
   
   
@@ -17,6 +17,5 @@ class AppInfo {
   static const String originalGithubUrl = 'https://github.com/afkarxyz/SpotiFLAC';
   
   static const String kofiUrl = 'https://ko-fi.com/zarzet';
-  static const String bmacUrl = 'https://buymeacoffee.com/zarzet';
   static const String githubSponsorsUrl = 'https://github.com/sponsors/zarzet/';
 }

lib/l10n/app_localizations.dart

@@ -928,18 +928,6 @@ abstract class AppLocalizations {
   /// **'Support'**
   String get aboutSupport;
 
-  /// Donation link
-  ///
-  /// In en, this message translates to:
-  /// **'Buy me a coffee'**
-  String get aboutBuyMeCoffee;
-
-  /// Subtitle for donation
-  ///
-  /// In en, this message translates to:
-  /// **'Support development on Ko-fi'**
-  String get aboutBuyMeCoffeeSubtitle;
-
   /// Section for app info
   ///
   /// In en, this message translates to:
@@ -2164,6 +2152,18 @@ abstract class AppLocalizations {
   /// **'{artist} - {title}'**
   String filenameHint(Object artist, Object title);
 
+  /// Toggle label for showing advanced filename tags
+  ///
+  /// In en, this message translates to:
+  /// **'Show advanced tags'**
+  String get filenameShowAdvancedTags;
+
+  /// Description for advanced filename tag toggle
+  ///
+  /// In en, this message translates to:
+  /// **'Enable formatted tags for track padding and date patterns'**
+  String get filenameShowAdvancedTagsDescription;
+
   /// Setting title - folder structure
   ///
   /// In en, this message translates to:
@@ -3550,6 +3550,24 @@ abstract class AppLocalizations {
   /// **'Artist folders use Track Artist only'**
   String get downloadUseAlbumArtistForFoldersTrackSubtitle;
 
+  /// Setting - strip featured artists from folder name
+  ///
+  /// In en, this message translates to:
+  /// **'Primary artist only for folders'**
+  String get downloadUsePrimaryArtistOnly;
+
+  /// Subtitle when primary artist only is enabled
+  ///
+  /// In en, this message translates to:
+  /// **'Featured artists removed from folder name (e.g. Justin Bieber, Quavo → Justin Bieber)'**
+  String get downloadUsePrimaryArtistOnlyEnabled;
+
+  /// Subtitle when primary artist only is disabled
+  ///
+  /// In en, this message translates to:
+  /// **'Full artist string used for folder name'**
+  String get downloadUsePrimaryArtistOnlyDisabled;
+
   /// Setting - output file format
   ///
   /// In en, this message translates to:
@@ -5062,6 +5080,12 @@ abstract class AppLocalizations {
   /// **'Fetch and save lyrics as .lrc file'**
   String get trackSaveLyricsSubtitle;
 
+  /// Snackbar while saving lyrics to file
+  ///
+  /// In en, this message translates to:
+  /// **'Saving lyrics...'**
+  String get trackSaveLyricsProgress;
+
   /// Menu action - re-embed metadata into audio file
   ///
   /// In en, this message translates to:
@@ -5133,6 +5157,70 @@ abstract class AppLocalizations {
   /// In en, this message translates to:
   /// **'Failed: {error}'**
   String trackSaveFailed(String error);
+
+  /// Menu item - convert audio format
+  ///
+  /// In en, this message translates to:
+  /// **'Convert Format'**
+  String get trackConvertFormat;
+
+  /// Subtitle for convert format menu item
+  ///
+  /// In en, this message translates to:
+  /// **'Convert to MP3 or Opus'**
+  String get trackConvertFormatSubtitle;
+
+  /// Title of convert bottom sheet
+  ///
+  /// In en, this message translates to:
+  /// **'Convert Audio'**
+  String get trackConvertTitle;
+
+  /// Label for format selection
+  ///
+  /// In en, this message translates to:
+  /// **'Target Format'**
+  String get trackConvertTargetFormat;
+
+  /// Label for bitrate selection
+  ///
+  /// In en, this message translates to:
+  /// **'Bitrate'**
+  String get trackConvertBitrate;
+
+  /// Confirmation dialog title
+  ///
+  /// In en, this message translates to:
+  /// **'Confirm Conversion'**
+  String get trackConvertConfirmTitle;
+
+  /// Confirmation dialog message
+  ///
+  /// In en, this message translates to:
+  /// **'Convert from {sourceFormat} to {targetFormat} at {bitrate}?\n\nThe original file will be deleted after conversion.'**
+  String trackConvertConfirmMessage(
+    String sourceFormat,
+    String targetFormat,
+    String bitrate,
+  );
+
+  /// Snackbar while converting
+  ///
+  /// In en, this message translates to:
+  /// **'Converting audio...'**
+  String get trackConvertConverting;
+
+  /// Snackbar after successful conversion
+  ///
+  /// In en, this message translates to:
+  /// **'Converted to {format} successfully'**
+  String trackConvertSuccess(String format);
+
+  /// Snackbar when conversion fails
+  ///
+  /// In en, this message translates to:
+  /// **'Conversion failed'**
+  String get trackConvertFailed;
 }
 
 class _AppLocalizationsDelegate

lib/l10n/app_localizations_en.dart

@@ -457,12 +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';
 
@@ -1188,6 +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';
 
@@ -1945,6 +1946,17 @@ class AppLocalizationsEn extends AppLocalizations {
   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';
 
@@ -2846,6 +2858,9 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
 
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
   @override
   String get trackReEnrich => 'Re-enrich Metadata';
 
@@ -2889,4 +2904,42 @@ class AppLocalizationsEn extends AppLocalizations {
   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';
 }

lib/l10n/app_localizations_fr.dart

@@ -13,62 +13,62 @@ class AppLocalizationsFr extends AppLocalizations {
 
   @override
   String get appDescription =>
-      'Download Spotify tracks in lossless quality from Tidal, Qobuz, and Amazon Music.';
+      'Téléchargez des pistes Spotify en qualité sans perte de Tidal, Qobuz et Amazon Music.';
 
   @override
-  String get navHome => 'Home';
+  String get navHome => 'Accueil';
 
   @override
-  String get navLibrary => 'Library';
+  String get navLibrary => 'Bibliothèques';
 
   @override
-  String get navHistory => 'History';
+  String get navHistory => 'Historique';
 
   @override
-  String get navSettings => 'Settings';
+  String get navSettings => 'Paramètres';
 
   @override
-  String get navStore => 'Store';
+  String get navStore => 'Magasin';
 
   @override
-  String get homeTitle => 'Home';
+  String get homeTitle => 'Accueil';
 
   @override
-  String get homeSearchHint => 'Paste Spotify URL or search...';
+  String get homeSearchHint => 'Coller l\'URL Spotify ou rechercher...';
 
   @override
   String homeSearchHintExtension(String extensionName) {
-    return 'Search with $extensionName...';
+    return 'Rechercher avec $extensionName...';
   }
 
   @override
-  String get homeSubtitle => 'Paste a Spotify link or search by name';
+  String get homeSubtitle => 'Coller un lien Spotify ou rechercher par nom';
 
   @override
-  String get homeSupports => 'Supports: Track, Album, Playlist, Artist URLs';
+  String get homeSupports => 'Supports: Piste, Album, Playlist, Artiste URLs';
 
   @override
-  String get homeRecent => 'Recent';
+  String get homeRecent => 'Récent';
 
   @override
-  String get historyTitle => 'History';
+  String get historyTitle => 'Historique';
 
   @override
   String historyDownloading(int count) {
-    return 'Downloading ($count)';
+    return 'Téléchargement ($count)';
   }
 
   @override
-  String get historyDownloaded => 'Downloaded';
+  String get historyDownloaded => 'Téléchargé';
 
   @override
-  String get historyFilterAll => 'All';
+  String get historyFilterAll => 'Tous';
 
   @override
   String get historyFilterAlbums => 'Albums';
 
   @override
-  String get historyFilterSingles => 'Singles';
+  String get historyFilterSingles => 'Titres';
 
   @override
   String historyTracksCount(int count) {
@@ -93,36 +93,37 @@ class AppLocalizationsFr extends AppLocalizations {
   }
 
   @override
-  String get historyNoDownloads => 'No download history';
+  String get historyNoDownloads => 'Pas d\'historique de téléchargement';
 
   @override
-  String get historyNoDownloadsSubtitle => 'Downloaded tracks will appear here';
+  String get historyNoDownloadsSubtitle =>
+      'Les pistes téléchargées apparaîtront ici';
 
   @override
-  String get historyNoAlbums => 'No album downloads';
+  String get historyNoAlbums => 'Pas de téléchargement d\'album';
 
   @override
   String get historyNoAlbumsSubtitle =>
-      'Download multiple tracks from an album to see them here';
+      'Téléchargez plusieurs titres d\'un album pour les voir ici';
 
   @override
-  String get historyNoSingles => 'No single downloads';
+  String get historyNoSingles => 'Pas de téléchargements uniques';
 
   @override
   String get historyNoSinglesSubtitle =>
-      'Single track downloads will appear here';
+      'Les téléchargements de pistes uniques apparaîtront ici';
 
   @override
-  String get historySearchHint => 'Search history...';
+  String get historySearchHint => 'Historique de recherche...';
 
   @override
-  String get settingsTitle => 'Settings';
+  String get settingsTitle => 'Paramètres';
 
   @override
-  String get settingsDownload => 'Download';
+  String get settingsDownload => 'Télécharger';
 
   @override
-  String get settingsAppearance => 'Appearance';
+  String get settingsAppearance => 'Apparence';
 
   @override
   String get settingsOptions => 'Options';
@@ -131,51 +132,54 @@ class AppLocalizationsFr extends AppLocalizations {
   String get settingsExtensions => 'Extensions';
 
   @override
-  String get settingsAbout => 'About';
+  String get settingsAbout => 'À propos';
 
   @override
-  String get downloadTitle => 'Download';
+  String get downloadTitle => 'Télécharger';
 
   @override
-  String get downloadLocation => 'Download Location';
+  String get downloadLocation => 'Télécharger Localisation';
 
   @override
-  String get downloadLocationSubtitle => 'Choose where to save files';
+  String get downloadLocationSubtitle =>
+      'Choisissez où enregistrer des fichiers';
 
   @override
-  String get downloadLocationDefault => 'Default location';
+  String get downloadLocationDefault => 'Localisation par défaut';
 
   @override
-  String get downloadDefaultService => 'Default Service';
+  String get downloadDefaultService => 'Service par défaut';
 
   @override
-  String get downloadDefaultServiceSubtitle => 'Service used for downloads';
+  String get downloadDefaultServiceSubtitle =>
+      'Service utilisé pour les téléchargements';
 
   @override
-  String get downloadDefaultQuality => 'Default Quality';
+  String get downloadDefaultQuality => 'Qualité par défaut';
 
   @override
-  String get downloadAskQuality => 'Ask Quality Before Download';
+  String get downloadAskQuality =>
+      'Demandez La Qualité Avant Le Téléchargement';
 
   @override
   String get downloadAskQualitySubtitle =>
-      'Show quality picker for each download';
+      'Afficher le sélecteur de qualité pour chaque téléchargement';
 
   @override
-  String get downloadFilenameFormat => 'Filename Format';
+  String get downloadFilenameFormat => 'Nom du fichier';
 
   @override
-  String get downloadFolderOrganization => 'Folder Organization';
+  String get downloadFolderOrganization => 'Organisation du dossier';
 
   @override
-  String get downloadSeparateSingles => 'Separate Singles';
+  String get downloadSeparateSingles => 'Titres séparés';
 
   @override
   String get downloadSeparateSinglesSubtitle =>
-      'Put single tracks in a separate folder';
+      'Mettre des pistes uniques dans un dossier séparé';
 
   @override
-  String get qualityBest => 'Best Available';
+  String get qualityBest => 'Meilleur Disponible';
 
   @override
   String get qualityFlac => 'FLAC';
@@ -187,69 +191,71 @@ class AppLocalizationsFr extends AppLocalizations {
   String get quality128 => '128 kbps';
 
   @override
-  String get appearanceTitle => 'Appearance';
+  String get appearanceTitle => 'Apparence';
 
   @override
-  String get appearanceTheme => 'Theme';
+  String get appearanceTheme => 'Thème';
 
   @override
-  String get appearanceThemeSystem => 'System';
+  String get appearanceThemeSystem => 'Système';
 
   @override
-  String get appearanceThemeLight => 'Light';
+  String get appearanceThemeLight => 'Clair';
 
   @override
-  String get appearanceThemeDark => 'Dark';
+  String get appearanceThemeDark => 'Sombre';
 
   @override
-  String get appearanceDynamicColor => 'Dynamic Color';
+  String get appearanceDynamicColor => 'Couleur dynamique';
 
   @override
-  String get appearanceDynamicColorSubtitle => 'Use colors from your wallpaper';
+  String get appearanceDynamicColorSubtitle =>
+      'Utilisez les couleurs de votre fond d\'écran';
 
   @override
-  String get appearanceAccentColor => 'Accent Color';
+  String get appearanceAccentColor => 'Couleur d\'accent';
 
   @override
-  String get appearanceHistoryView => 'History View';
+  String get appearanceHistoryView => 'Historique Vue';
 
   @override
-  String get appearanceHistoryViewList => 'List';
+  String get appearanceHistoryViewList => '';
 
   @override
-  String get appearanceHistoryViewGrid => 'Grid';
+  String get appearanceHistoryViewGrid => 'Grille';
 
   @override
   String get optionsTitle => 'Options';
 
   @override
-  String get optionsSearchSource => 'Search Source';
+  String get optionsSearchSource => 'Recherche Source';
 
   @override
-  String get optionsPrimaryProvider => 'Primary Provider';
+  String get optionsPrimaryProvider => 'Fournisseur principal';
 
   @override
   String get optionsPrimaryProviderSubtitle =>
-      'Service used when searching by track name.';
+      'Service utilisé lors de la recherche par nom de piste.';
 
   @override
   String optionsUsingExtension(String extensionName) {
-    return 'Using extension: $extensionName';
+    return 'Utilisation de l\'extension: $extensionName';
   }
 
   @override
   String get optionsSwitchBack =>
-      'Tap Deezer or Spotify to switch back from extension';
+      'Appuyez sur Deezer ou Spotify pour revenir à l\'extension';
 
   @override
   String get optionsAutoFallback => 'Auto Fallback';
 
   @override
   String get optionsAutoFallbackSubtitle =>
-      'Try other services if download fails';
+      'Essayez d\'autres services si le téléchargement échoue';
 
   @override
-  String get optionsUseExtensionProviders => 'Use Extension Providers';
+  String get optionsUseExtensionProviders =>
+      'Utiliser des fournisseurs d\'extension';
 
   @override
   String get optionsUseExtensionProvidersOn => 'Extensions will be tried first';
@@ -376,16 +382,16 @@ class AppLocalizationsFr extends AppLocalizations {
   }
 
   @override
-  String get extensionsUninstall => 'Uninstall';
+  String get extensionsUninstall => 'Désinstaller';
 
   @override
-  String get extensionsSetAsSearch => 'Set as Search Provider';
+  String get extensionsSetAsSearch => 'Défini comme fournisseur de recherche';
 
   @override
-  String get storeTitle => 'Extension Store';
+  String get storeTitle => 'Magasin d\'extension';
 
   @override
-  String get storeSearch => 'Search extensions...';
+  String get storeSearch => 'Recherche d\'extensions...';
 
   @override
   String get storeInstall => 'Install';
@@ -457,12 +463,6 @@ class AppLocalizationsFr 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';
 
@@ -573,7 +573,7 @@ class AppLocalizationsFr extends AppLocalizations {
   String get trackMetadataDuration => 'Duration';
 
   @override
-  String get trackMetadataQuality => 'Quality';
+  String get trackMetadataQuality => '';
 
   @override
   String get trackMetadataPath => 'File Path';
@@ -585,38 +585,38 @@ class AppLocalizationsFr extends AppLocalizations {
   String get trackMetadataService => 'Service';
 
   @override
-  String get trackMetadataPlay => 'Play';
+  String get trackMetadataPlay => 'Jouer';
 
   @override
-  String get trackMetadataShare => 'Share';
+  String get trackMetadataShare => 'Partager';
 
   @override
-  String get trackMetadataDelete => 'Delete';
+  String get trackMetadataDelete => 'Supprimer';
 
   @override
-  String get trackMetadataRedownload => 'Re-download';
+  String get trackMetadataRedownload => 'Re-télécharger';
 
   @override
-  String get trackMetadataOpenFolder => 'Open Folder';
+  String get trackMetadataOpenFolder => 'Dossier ouvert';
 
   @override
-  String get setupTitle => 'Welcome to SpotiFLAC';
+  String get setupTitle => 'Bienvenue chez SpotiFLAC';
 
   @override
-  String get setupSubtitle => 'Let\'s get you started';
+  String get setupSubtitle => 'On va commencer';
 
   @override
-  String get setupStoragePermission => 'Storage Permission';
+  String get setupStoragePermission => 'Permission de stockage';
 
   @override
   String get setupStoragePermissionSubtitle =>
-      'Required to save downloaded files';
+      'Requis pour enregistrer les fichiers téléchargés';
 
   @override
-  String get setupStoragePermissionGranted => 'Permission granted';
+  String get setupStoragePermissionGranted => 'Permission accordée';
 
   @override
-  String get setupStoragePermissionDenied => 'Permission denied';
+  String get setupStoragePermissionDenied => 'Permission refusée';
 
   @override
   String get setupGrantPermission => 'Grant Permission';
@@ -741,14 +741,14 @@ class AppLocalizationsFr extends AppLocalizations {
       'Get notified when downloads complete or require attention.';
 
   @override
-  String get setupFolderSelected => 'Download Folder Selected!';
+  String get setupFolderSelected => 'Dossier de téléchargement sélectionné!';
 
   @override
-  String get setupFolderChoose => 'Choose Download Folder';
+  String get setupFolderChoose => 'Choisissez le dossier pour télécharger';
 
   @override
   String get setupFolderDescription =>
-      'Select a folder where your downloaded music will be saved.';
+      'Sélectionnez un dossier dans lequel votre musique téléchargée sera enregistrée.';
 
   @override
   String get setupChangeFolder => 'Change Folder';
@@ -1188,6 +1188,13 @@ class AppLocalizationsFr 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';
 
@@ -1945,6 +1952,17 @@ class AppLocalizationsFr extends AppLocalizations {
   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';
 
@@ -2846,6 +2864,9 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
 
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
   @override
   String get trackReEnrich => 'Re-enrich Metadata';
 
@@ -2889,4 +2910,42 @@ class AppLocalizationsFr extends AppLocalizations {
   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';
 }

lib/l10n/app_localizations_hi.dart

@@ -457,12 +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';
 
@@ -1188,6 +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';
 
@@ -1945,6 +1946,17 @@ class AppLocalizationsHi extends AppLocalizations {
   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';
 
@@ -2846,6 +2858,9 @@ class AppLocalizationsHi extends AppLocalizations {
   @override
   String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
 
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
   @override
   String get trackReEnrich => 'Re-enrich Metadata';
 
@@ -2889,4 +2904,42 @@ class AppLocalizationsHi extends AppLocalizations {
   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';
 }

lib/l10n/app_localizations_id.dart

@@ -349,7 +349,7 @@ class AppLocalizationsId extends AppLocalizations {
 
   @override
   String get optionsSpotifyDeprecationWarning =>
-      'Pencarian Spotify akan dihentikan pada 3 Maret 2026 karena perubahan API Spotify. Silakan beralih ke Deezer.';
+      'Spotify search will be deprecated on March 3, 2026 due to Spotify API changes. Please switch to Deezer.';
 
   @override
   String get extensionsTitle => 'Ekstensi';
@@ -462,12 +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';
 
@@ -1194,6 +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';
 
@@ -1947,16 +1948,26 @@ class AppLocalizationsId extends AppLocalizations {
   String get downloadAlbumFolderStructure => 'Struktur Folder Album';
 
   @override
-  String get downloadUseAlbumArtistForFolders =>
-      'Gunakan Album Artist untuk folder';
+  String get downloadUseAlbumArtistForFolders => 'Use Album Artist for folders';
 
   @override
   String get downloadUseAlbumArtistForFoldersAlbumSubtitle =>
-      'Folder artis memakai Album Artist jika tersedia';
+      'Artist folders use Album Artist when available';
 
   @override
   String get downloadUseAlbumArtistForFoldersTrackSubtitle =>
-      'Folder artis hanya memakai Track Artist';
+      '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';
@@ -2195,10 +2206,10 @@ class AppLocalizationsId extends AppLocalizations {
   String get recentTypePlaylist => 'Playlist';
 
   @override
-  String get recentEmpty => 'Belum ada item terbaru';
+  String get recentEmpty => 'No recent items yet';
 
   @override
-  String get recentShowAllDownloads => 'Tampilkan Semua Download';
+  String get recentShowAllDownloads => 'Show All Downloads';
 
   @override
   String recentPlaylistInfo(String name) {
@@ -2307,10 +2318,10 @@ class AppLocalizationsId extends AppLocalizations {
   String get settingsLocalLibrarySubtitle => 'Scan music & detect duplicates';
 
   @override
-  String get settingsCache => 'Penyimpanan & Cache';
+  String get settingsCache => 'Storage & Cache';
 
   @override
-  String get settingsCacheSubtitle => 'Lihat ukuran dan bersihkan data cache';
+  String get settingsCacheSubtitle => 'View size and clear cached data';
 
   @override
   String get libraryTitle => 'Local Library';
@@ -2585,221 +2596,219 @@ class AppLocalizationsId extends AppLocalizations {
   String get storageModeInfo => 'Your files are stored in multiple locations';
 
   @override
-  String get tutorialWelcomeTitle => 'Selamat Datang di SpotiFLAC!';
+  String get tutorialWelcomeTitle => 'Welcome to SpotiFLAC!';
 
   @override
   String get tutorialWelcomeDesc =>
-      'Mari pelajari cara mengunduh musik favorit Anda dalam kualitas lossless. Tutorial singkat ini akan menunjukkan dasar-dasarnya.';
+      'Let\'s learn how to download your favorite music in lossless quality. This quick tutorial will show you the basics.';
 
   @override
   String get tutorialWelcomeTip1 =>
-      'Unduh musik dari Spotify, Deezer, atau tempel URL yang didukung';
+      'Download music from Spotify, Deezer, or paste any supported URL';
 
   @override
   String get tutorialWelcomeTip2 =>
-      'Dapatkan audio kualitas FLAC dari Tidal, Qobuz, atau Amazon Music';
+      'Get FLAC quality audio from Tidal, Qobuz, or Amazon Music';
 
   @override
   String get tutorialWelcomeTip3 =>
-      'Metadata, cover art, dan lirik otomatis tertanam';
+      'Automatic metadata, cover art, and lyrics embedding';
 
   @override
-  String get tutorialSearchTitle => 'Mencari Musik';
+  String get tutorialSearchTitle => 'Finding Music';
 
   @override
   String get tutorialSearchDesc =>
-      'Ada dua cara mudah untuk menemukan musik yang ingin Anda unduh.';
+      'There are two easy ways to find music you want to download.';
 
   @override
   String get tutorialSearchTip1 =>
-      'Tempel URL Spotify atau Deezer langsung di kotak pencarian';
+      'Paste a Spotify or Deezer URL directly in the search box';
 
   @override
   String get tutorialSearchTip2 =>
-      'Atau ketik nama lagu, artis, atau album untuk mencari';
+      'Or type the song name, artist, or album to search';
 
   @override
   String get tutorialSearchTip3 =>
-      'Mendukung lagu, album, playlist, dan halaman artis';
+      'Supports tracks, albums, playlists, and artist pages';
 
   @override
-  String get tutorialDownloadTitle => 'Mengunduh Musik';
+  String get tutorialDownloadTitle => 'Downloading Music';
 
   @override
   String get tutorialDownloadDesc =>
-      'Mengunduh musik itu mudah dan cepat. Begini caranya.';
+      'Downloading music is simple and fast. Here\'s how it works.';
 
   @override
   String get tutorialDownloadTip1 =>
-      'Ketuk tombol unduh di samping lagu mana pun untuk mulai mengunduh';
+      'Tap the download button next to any track to start downloading';
 
   @override
   String get tutorialDownloadTip2 =>
-      'Pilih kualitas yang Anda inginkan (FLAC, Hi-Res, atau MP3)';
+      'Choose your preferred quality (FLAC, Hi-Res, or MP3)';
 
   @override
   String get tutorialDownloadTip3 =>
-      'Unduh seluruh album atau playlist dengan satu ketukan';
+      'Download entire albums or playlists with one tap';
 
   @override
-  String get tutorialLibraryTitle => 'Perpustakaan Anda';
+  String get tutorialLibraryTitle => 'Your Library';
 
   @override
   String get tutorialLibraryDesc =>
-      'Semua musik yang Anda unduh terorganisir di tab Perpustakaan.';
+      'All your downloaded music is organized in the Library tab.';
 
   @override
   String get tutorialLibraryTip1 =>
-      'Lihat progres unduhan dan antrian di tab Perpustakaan';
+      'View download progress and queue in the Library tab';
 
   @override
   String get tutorialLibraryTip2 =>
-      'Ketuk lagu mana pun untuk memutarnya dengan pemutar musik';
+      'Tap any track to play it with your music player';
 
   @override
   String get tutorialLibraryTip3 =>
-      'Beralih antara tampilan daftar dan grid untuk penjelajahan lebih baik';
+      'Switch between list and grid view for better browsing';
 
   @override
-  String get tutorialExtensionsTitle => 'Ekstensi';
+  String get tutorialExtensionsTitle => 'Extensions';
 
   @override
   String get tutorialExtensionsDesc =>
-      'Tingkatkan kemampuan aplikasi dengan ekstensi komunitas.';
+      'Extend the app\'s capabilities with community extensions.';
 
   @override
   String get tutorialExtensionsTip1 =>
-      'Jelajahi tab Toko untuk menemukan ekstensi berguna';
+      'Browse the Store tab to discover useful extensions';
 
   @override
   String get tutorialExtensionsTip2 =>
-      'Tambahkan provider unduhan atau sumber pencarian baru';
+      'Add new download providers or search sources';
 
   @override
   String get tutorialExtensionsTip3 =>
-      'Dapatkan lirik, metadata lebih baik, dan fitur lainnya';
+      'Get lyrics, enhanced metadata, and more features';
 
   @override
-  String get tutorialSettingsTitle => 'Sesuaikan Pengalaman Anda';
+  String get tutorialSettingsTitle => 'Customize Your Experience';
 
   @override
   String get tutorialSettingsDesc =>
-      'Personalisasi aplikasi di Pengaturan sesuai preferensi Anda.';
+      'Personalize the app in Settings to match your preferences.';
 
   @override
   String get tutorialSettingsTip1 =>
-      'Ubah lokasi unduhan dan organisasi folder';
+      'Change download location and folder organization';
 
   @override
   String get tutorialSettingsTip2 =>
-      'Atur kualitas audio dan preferensi format default';
+      'Set default audio quality and format preferences';
 
   @override
-  String get tutorialSettingsTip3 => 'Sesuaikan tema dan tampilan aplikasi';
+  String get tutorialSettingsTip3 => 'Customize app theme and appearance';
 
   @override
   String get tutorialReadyMessage =>
-      'Anda siap! Mulai unduh musik favorit Anda sekarang.';
+      'You\'re all set! Start downloading your favorite music now.';
 
   @override
-  String get tutorialExample => 'CONTOH';
+  String get tutorialExample => 'EXAMPLE';
 
   @override
-  String get libraryForceFullScan => 'Pindai Ulang Penuh';
+  String get libraryForceFullScan => 'Force Full Scan';
 
   @override
-  String get libraryForceFullScanSubtitle =>
-      'Pindai ulang semua file, abaikan cache';
+  String get libraryForceFullScanSubtitle => 'Rescan all files, ignoring cache';
 
   @override
-  String get cleanupOrphanedDownloads => 'Bersihkan Entri Unduhan Tidak Valid';
+  String get cleanupOrphanedDownloads => 'Cleanup Orphaned Downloads';
 
   @override
   String get cleanupOrphanedDownloadsSubtitle =>
-      'Hapus entri riwayat untuk file yang tidak ada lagi';
+      'Remove history entries for files that no longer exist';
 
   @override
   String cleanupOrphanedDownloadsResult(int count) {
-    return 'Menghapus $count entri unduhan tidak valid dari riwayat';
+    return 'Removed $count orphaned entries from history';
   }
 
   @override
-  String get cleanupOrphanedDownloadsNone =>
-      'Tidak ada entri unduhan tidak valid';
+  String get cleanupOrphanedDownloadsNone => 'No orphaned entries found';
 
   @override
-  String get cacheTitle => 'Penyimpanan & Cache';
+  String get cacheTitle => 'Storage & Cache';
 
   @override
-  String get cacheSummaryTitle => 'Ringkasan cache';
+  String get cacheSummaryTitle => 'Cache overview';
 
   @override
   String get cacheSummarySubtitle =>
-      'Membersihkan cache tidak akan menghapus file musik yang sudah diunduh.';
+      'Clearing cache will not remove downloaded music files.';
 
   @override
   String cacheEstimatedTotal(String size) {
-    return 'Estimasi penggunaan cache: $size';
+    return 'Estimated cache usage: $size';
   }
 
   @override
-  String get cacheSectionStorage => 'Data Cache';
+  String get cacheSectionStorage => 'Cached Data';
 
   @override
-  String get cacheSectionMaintenance => 'Perawatan';
+  String get cacheSectionMaintenance => 'Maintenance';
 
   @override
-  String get cacheAppDirectory => 'Direktori cache aplikasi';
+  String get cacheAppDirectory => 'App cache directory';
 
   @override
   String get cacheAppDirectoryDesc =>
-      'Respons HTTP, data WebView, dan data sementara aplikasi.';
+      'HTTP responses, WebView data, and other temporary app data.';
 
   @override
-  String get cacheTempDirectory => 'Direktori sementara';
+  String get cacheTempDirectory => 'Temporary directory';
 
   @override
   String get cacheTempDirectoryDesc =>
-      'File sementara dari proses download dan konversi audio.';
+      'Temporary files from downloads and audio conversion.';
 
   @override
-  String get cacheCoverImage => 'Cache gambar cover';
+  String get cacheCoverImage => 'Cover image cache';
 
   @override
   String get cacheCoverImageDesc =>
-      'Gambar cover album dan lagu yang diunduh. Akan diunduh ulang saat dilihat.';
+      'Downloaded album and track cover art. Will re-download when viewed.';
 
   @override
-  String get cacheLibraryCover => 'Cache cover library';
+  String get cacheLibraryCover => 'Library cover cache';
 
   @override
   String get cacheLibraryCoverDesc =>
-      'Cover dari file musik lokal. Akan diekstrak ulang saat scan berikutnya.';
+      'Cover art extracted from local music files. Will re-extract on next scan.';
 
   @override
-  String get cacheExploreFeed => 'Cache feed Explore';
+  String get cacheExploreFeed => 'Explore feed cache';
 
   @override
   String get cacheExploreFeedDesc =>
-      'Konten tab Explore (rilis baru, trending). Akan dimuat ulang saat dikunjungi.';
+      'Explore tab content (new releases, trending). Will refresh on next visit.';
 
   @override
-  String get cacheTrackLookup => 'Cache pencocokan lagu';
+  String get cacheTrackLookup => 'Track lookup cache';
 
   @override
   String get cacheTrackLookupDesc =>
-      'Cache pencarian ID lagu Spotify/Deezer. Menghapus mungkin memperlambat beberapa pencarian.';
+      'Spotify/Deezer track ID lookups. Clearing may slow next few searches.';
 
   @override
   String get cacheCleanupUnusedDesc =>
-      'Hapus entri riwayat download dan library yang filenya sudah tidak ada.';
+      'Remove orphaned download history and library entries for missing files.';
 
   @override
-  String get cacheNoData => 'Tidak ada data cache';
+  String get cacheNoData => 'No cached data';
 
   @override
   String cacheSizeWithFiles(String size, int count) {
-    return '$size dalam $count file';
+    return '$size in $count files';
   }
 
   @override
@@ -2809,103 +2818,141 @@ class AppLocalizationsId extends AppLocalizations {
 
   @override
   String cacheEntries(int count) {
-    return '$count entri';
+    return '$count entries';
   }
 
   @override
   String cacheClearSuccess(String target) {
-    return 'Berhasil dibersihkan: $target';
+    return 'Cleared: $target';
   }
 
   @override
-  String get cacheClearConfirmTitle => 'Bersihkan cache?';
+  String get cacheClearConfirmTitle => 'Clear cache?';
 
   @override
   String cacheClearConfirmMessage(String target) {
-    return 'Ini akan membersihkan data cache untuk $target. File musik yang sudah diunduh tidak akan dihapus.';
+    return 'This will clear cached data for $target. Downloaded music files will not be deleted.';
   }
 
   @override
-  String get cacheClearAllConfirmTitle => 'Bersihkan semua cache?';
+  String get cacheClearAllConfirmTitle => 'Clear all cache?';
 
   @override
   String get cacheClearAllConfirmMessage =>
-      'Ini akan membersihkan semua kategori cache di halaman ini. File musik yang sudah diunduh tidak akan dihapus.';
+      'This will clear all cache categories on this page. Downloaded music files will not be deleted.';
 
   @override
-  String get cacheClearAll => 'Bersihkan semua cache';
+  String get cacheClearAll => 'Clear all cache';
 
   @override
-  String get cacheCleanupUnused => 'Bersihkan data tidak terpakai';
+  String get cacheCleanupUnused => 'Cleanup unused data';
 
   @override
   String get cacheCleanupUnusedSubtitle =>
-      'Hapus riwayat unduhan yatim dan entri library yang file-nya hilang';
+      'Remove orphaned download history and missing library entries';
 
   @override
   String cacheCleanupResult(int downloadCount, int libraryCount) {
-    return 'Pembersihan selesai: $downloadCount unduhan yatim, $libraryCount entri library hilang';
+    return 'Cleanup completed: $downloadCount orphaned downloads, $libraryCount missing library entries';
   }
 
   @override
-  String get cacheRefreshStats => 'Segarkan statistik';
+  String get cacheRefreshStats => 'Refresh stats';
 
   @override
-  String get trackSaveCoverArt => 'Simpan Cover Art';
+  String get trackSaveCoverArt => 'Save Cover Art';
 
   @override
-  String get trackSaveCoverArtSubtitle =>
-      'Simpan cover album sebagai file .jpg';
+  String get trackSaveCoverArtSubtitle => 'Save album art as .jpg file';
 
   @override
-  String get trackSaveLyrics => 'Simpan Lirik (.lrc)';
+  String get trackSaveLyrics => 'Save Lyrics (.lrc)';
 
   @override
-  String get trackSaveLyricsSubtitle =>
-      'Ambil dan simpan lirik sebagai file .lrc';
+  String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
 
   @override
-  String get trackReEnrich => 'Perkaya Ulang Metadata';
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
+  @override
+  String get trackReEnrich => 'Re-enrich Metadata';
 
   @override
   String get trackReEnrichSubtitle =>
-      'Tanamkan ulang metadata tanpa mengunduh ulang';
+      'Re-embed metadata without re-downloading';
 
   @override
   String get trackReEnrichOnlineSubtitle =>
-      'Cari metadata dari internet dan tanamkan ke file';
+      'Search metadata online and embed into file';
 
   @override
   String get trackEditMetadata => 'Edit Metadata';
 
   @override
   String trackCoverSaved(String fileName) {
-    return 'Cover art disimpan ke $fileName';
+    return 'Cover art saved to $fileName';
   }
 
   @override
-  String get trackCoverNoSource => 'Tidak ada sumber cover art';
+  String get trackCoverNoSource => 'No cover art source available';
 
   @override
   String trackLyricsSaved(String fileName) {
-    return 'Lirik disimpan ke $fileName';
+    return 'Lyrics saved to $fileName';
   }
 
   @override
-  String get trackReEnrichProgress => 'Memperkaya ulang metadata...';
+  String get trackReEnrichProgress => 'Re-enriching metadata...';
 
   @override
-  String get trackReEnrichSearching => 'Mencari metadata dari internet...';
+  String get trackReEnrichSearching => 'Searching metadata online...';
 
   @override
-  String get trackReEnrichSuccess => 'Metadata berhasil diperkaya ulang';
+  String get trackReEnrichSuccess => 'Metadata re-enriched successfully';
 
   @override
-  String get trackReEnrichFfmpegFailed =>
-      'Gagal menanamkan metadata via FFmpeg';
+  String get trackReEnrichFfmpegFailed => 'FFmpeg metadata embed failed';
 
   @override
   String trackSaveFailed(String error) {
-    return 'Gagal: $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';
 }

lib/l10n/app_localizations_ja.dart

@@ -453,12 +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';
 
@@ -1182,6 +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';
 
@@ -1933,6 +1934,17 @@ class AppLocalizationsJa extends AppLocalizations {
   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';
 
@@ -2832,6 +2844,9 @@ class AppLocalizationsJa extends AppLocalizations {
   @override
   String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
 
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
   @override
   String get trackReEnrich => 'Re-enrich Metadata';
 
@@ -2875,4 +2890,42 @@ class AppLocalizationsJa extends AppLocalizations {
   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';
 }

lib/l10n/app_localizations_ko.dart

@@ -13,7 +13,7 @@ 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';
@@ -34,32 +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';
@@ -75,7 +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';
@@ -245,14 +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';
@@ -457,12 +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';
 
@@ -1188,6 +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';
 
@@ -1945,6 +1945,17 @@ class AppLocalizationsKo extends AppLocalizations {
   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';
 
@@ -2846,6 +2857,9 @@ class AppLocalizationsKo extends AppLocalizations {
   @override
   String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
 
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
   @override
   String get trackReEnrich => 'Re-enrich Metadata';
 
@@ -2889,4 +2903,42 @@ class AppLocalizationsKo extends AppLocalizations {
   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';
 }

lib/l10n/app_localizations_nl.dart

@@ -457,12 +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';
 
@@ -1188,6 +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';
 
@@ -1945,6 +1946,17 @@ class AppLocalizationsNl extends AppLocalizations {
   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';
 
@@ -2846,6 +2858,9 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
 
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
   @override
   String get trackReEnrich => 'Re-enrich Metadata';
 
@@ -2889,4 +2904,42 @@ class AppLocalizationsNl extends AppLocalizations {
   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';
 }

lib/l10n/app_localizations_ru.dart

@@ -19,7 +19,7 @@ class AppLocalizationsRu extends AppLocalizations {
   String get navHome => 'Главная';
 
   @override
-  String get navLibrary => 'Library';
+  String get navLibrary => 'Библиотека';
 
   @override
   String get navHistory => 'История';
@@ -356,7 +356,7 @@ class AppLocalizationsRu extends AppLocalizations {
 
   @override
   String get optionsSpotifyDeprecationWarning =>
-      'Spotify search will be deprecated on March 3, 2026 due to Spotify API changes. Please switch to Deezer.';
+      'Поиск Spotify устареет 3 марта 2026 года из-за изменений Spotify API. Пожалуйста, перейдите на Deezer.';
 
   @override
   String get extensionsTitle => 'Расширения';
@@ -470,12 +470,6 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get aboutSupport => 'Поддержка';
 
-  @override
-  String get aboutBuyMeCoffee => 'Купить мне кофе';
-
-  @override
-  String get aboutBuyMeCoffeeSubtitle => 'Поддержать разработку на Ko-fi';
-
   @override
   String get aboutApp => 'Приложение';
 
@@ -492,7 +486,7 @@ class AppLocalizationsRu extends AppLocalizations {
 
   @override
   String get aboutSjdonadoDesc =>
-      'Creator of I Don\'t Have Spotify (IDHS). The fallback link resolver that saves the day!';
+      'Создатель I Don\'t Have Spotify (IDHS). Резервный резолвер ссылки';
 
   @override
   String get aboutDoubleDouble => 'DoubleDouble';
@@ -513,7 +507,7 @@ class AppLocalizationsRu extends AppLocalizations {
 
   @override
   String get aboutSpotiSaverDesc =>
-      'Tidal Hi-Res FLAC streaming endpoints. A key piece of the lossless puzzle!';
+      'Потоковая передача Tidal Hi-Res FLAC. Ключевая часть lossless головоломки!';
 
   @override
   String get aboutAppDescription =>
@@ -718,7 +712,7 @@ class AppLocalizationsRu extends AppLocalizations {
 
   @override
   String get setupIcloudNotSupported =>
-      'iCloud Drive is not supported. Please use the app Documents folder.';
+      'iCloud Drive не поддерживается. Пожалуйста, используйте папку Документы.';
 
   @override
   String get setupDownloadInFlac => 'Скачать Spotify треки во FLAC';
@@ -981,7 +975,7 @@ class AppLocalizationsRu extends AppLocalizations {
 
   @override
   String snackbarAlreadyInLibrary(String trackName) {
-    return '\"$trackName\" already exists in your library';
+    return '\"$trackName\" уже есть в вашей библиотеке';
   }
 
   @override
@@ -1215,6 +1209,13 @@ class AppLocalizationsRu 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 => 'Организация папок';
 
@@ -1924,33 +1925,35 @@ class AppLocalizationsRu extends AppLocalizations {
   String get qualityLossy => 'Lossy';
 
   @override
-  String get qualityLossyMp3Subtitle => 'MP3 320kbps (converted from FLAC)';
+  String get qualityLossyMp3Subtitle =>
+      'Opus 320 кбит/с (конвертировать из FLAC)';
 
   @override
-  String get qualityLossyOpusSubtitle => 'Opus 128kbps (converted from FLAC)';
+  String get qualityLossyOpusSubtitle =>
+      'Opus 128 кбит/с (конвертировать из FLAC)';
 
   @override
-  String get enableLossyOption => 'Enable Lossy Option';
+  String get enableLossyOption => 'Включить опцию Lossy';
 
   @override
-  String get enableLossyOptionSubtitleOn => 'Lossy quality option is available';
+  String get enableLossyOptionSubtitleOn => 'Доступно качество с потерями';
 
   @override
   String get enableLossyOptionSubtitleOff =>
-      'Downloads FLAC then converts to lossy format';
+      'Скачивать FLAC и конвертировать в MP3 320 кбит/с';
 
   @override
-  String get lossyFormat => 'Lossy Format';
+  String get lossyFormat => 'Формат с потерями';
 
   @override
-  String get lossyFormatDescription => 'Choose the lossy format for conversion';
+  String get lossyFormatDescription => 'Выберите Lossy формат для конвертации';
 
   @override
-  String get lossyFormatMp3Subtitle => '320kbps, best compatibility';
+  String get lossyFormatMp3Subtitle => '320Кбит/с, лучшая совместимость';
 
   @override
   String get lossyFormatOpusSubtitle =>
-      '128kbps, better quality at smaller size';
+      '128кбит/с, лучшее качество при меньших размерах';
 
   @override
   String get qualityNote =>
@@ -1958,7 +1961,7 @@ class AppLocalizationsRu extends AppLocalizations {
 
   @override
   String get youtubeQualityNote =>
-      'YouTube provides lossy audio only. Not part of lossless fallback.';
+      'YouTube обеспечивает только звук с потерями(Lossy).';
 
   @override
   String get downloadAskBeforeDownload => 'Спрашивать перед скачиванием';
@@ -1973,7 +1976,8 @@ class AppLocalizationsRu extends AppLocalizations {
   String get downloadAlbumFolderStructure => 'Структура папок альбома';
 
   @override
-  String get downloadUseAlbumArtistForFolders => 'Use Album Artist for folders';
+  String get downloadUseAlbumArtistForFolders =>
+      'Использовать исполнителя альбома для папок';
 
   @override
   String get downloadUseAlbumArtistForFoldersAlbumSubtitle =>
@@ -1981,7 +1985,18 @@ class AppLocalizationsRu extends AppLocalizations {
 
   @override
   String get downloadUseAlbumArtistForFoldersTrackSubtitle =>
-      'Artist folders use Track Artist only';
+      'Папки исполнителя используют только трек исполнителя';
+
+  @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 => 'Формат сохранения';
@@ -2064,37 +2079,37 @@ class AppLocalizationsRu extends AppLocalizations {
       'Вы уверены, что хотите очистить все загрузки?';
 
   @override
-  String get queueExportFailed => 'Export';
+  String get queueExportFailed => 'Экспорт';
 
   @override
   String get queueExportFailedSuccess =>
-      'Failed downloads exported to TXT file';
+      'Сбой при экспорте загрузок в файл TXT';
 
   @override
-  String get queueExportFailedClear => 'Clear Failed';
+  String get queueExportFailedClear => 'Не удалось очистить';
 
   @override
-  String get queueExportFailedError => 'Failed to export downloads';
+  String get queueExportFailedError => 'Не удалось экспортировать загрузки';
 
   @override
-  String get settingsAutoExportFailed => 'Auto-export failed downloads';
+  String get settingsAutoExportFailed => 'Автоэкспорт неудачных загрузок';
 
   @override
   String get settingsAutoExportFailedSubtitle =>
-      'Save failed downloads to TXT file automatically';
+      'Автоматическое сохранение неудачных загрузок в TXT файл';
 
   @override
-  String get settingsDownloadNetwork => 'Download Network';
+  String get settingsDownloadNetwork => 'Сеть для скачивания';
 
   @override
-  String get settingsDownloadNetworkAny => 'WiFi + Mobile Data';
+  String get settingsDownloadNetworkAny => 'WiFi и мобильная сеть';
 
   @override
-  String get settingsDownloadNetworkWifiOnly => 'WiFi Only';
+  String get settingsDownloadNetworkWifiOnly => 'Только WiFi';
 
   @override
   String get settingsDownloadNetworkSubtitle =>
-      'Choose which network to use for downloads. When set to WiFi Only, downloads will pause on mobile data.';
+      'Выберите, какую сеть использовать для скачивания. Когда установлено значение только WiFi — скачивания через мобильную сеть будут приостановлены.';
 
   @override
   String get queueEmpty => 'Нет загрузок в очереди';
@@ -2226,10 +2241,10 @@ class AppLocalizationsRu extends AppLocalizations {
   String get recentTypePlaylist => 'Плейлист';
 
   @override
-  String get recentEmpty => 'No recent items yet';
+  String get recentEmpty => 'Нет недавних элементов';
 
   @override
-  String get recentShowAllDownloads => 'Show All Downloads';
+  String get recentShowAllDownloads => 'Показать все загрузки';
 
   @override
   String recentPlaylistInfo(String name) {
@@ -2309,234 +2324,254 @@ class AppLocalizationsRu extends AppLocalizations {
       'Не удалось получить некоторые альбомы';
 
   @override
-  String get sectionStorageAccess => 'Storage Access';
+  String get sectionStorageAccess => 'Доступ к хранилищу';
 
   @override
-  String get allFilesAccess => 'All Files Access';
+  String get allFilesAccess => 'Доступ ко всем файлам';
 
   @override
-  String get allFilesAccessEnabledSubtitle => 'Can write to any folder';
+  String get allFilesAccessEnabledSubtitle => 'Можно записать в любую папку';
 
   @override
-  String get allFilesAccessDisabledSubtitle => 'Limited to media folders only';
+  String get allFilesAccessDisabledSubtitle =>
+      'Ограничено только папками медиа';
 
   @override
   String get allFilesAccessDescription =>
-      'Enable this if you encounter write errors when saving to custom folders. Android 13+ restricts access to certain directories by default.';
+      'Включите, если вы сталкиваетесь с ошибками записи при сохранении в пользовательские папки. Android 13+ по умолчанию ограничивает доступ к определенным папкам.';
 
   @override
   String get allFilesAccessDeniedMessage =>
-      'Permission was denied. Please enable \'All files access\' manually in system settings.';
+      'В разрешении отказано. Пожалуйста, включите функцию «Доступ ко всем файлам» в настройках системы.';
 
   @override
   String get allFilesAccessDisabledMessage =>
-      'All Files Access disabled. The app will use limited storage access.';
+      'Доступ ко всем файлам отключен. Приложение будет использовать ограниченный доступ к хранилищу.';
 
   @override
-  String get settingsLocalLibrary => 'Local Library';
+  String get settingsLocalLibrary => 'Локальная библиотека';
 
   @override
-  String get settingsLocalLibrarySubtitle => 'Scan music & detect duplicates';
+  String get settingsLocalLibrarySubtitle =>
+      'Сканировать и обнаружить дубликаты';
 
   @override
-  String get settingsCache => 'Storage & Cache';
+  String get settingsCache => 'Хранилище и кэш';
 
   @override
-  String get settingsCacheSubtitle => 'View size and clear cached data';
+  String get settingsCacheSubtitle => 'Просмотреть размер и очистить кэш';
 
   @override
-  String get libraryTitle => 'Local Library';
+  String get libraryTitle => 'Локальная библиотека';
 
   @override
-  String get libraryStatus => 'Library Status';
+  String get libraryStatus => 'Статус Библиотеки';
 
   @override
-  String get libraryScanSettings => 'Scan Settings';
+  String get libraryScanSettings => 'Настройки сканирования';
 
   @override
-  String get libraryEnableLocalLibrary => 'Enable Local Library';
+  String get libraryEnableLocalLibrary => 'Включить локальную библиотеку';
 
   @override
   String get libraryEnableLocalLibrarySubtitle =>
-      'Scan and track your existing music';
+      'Сканировать и отслеживать вашу существующую музыку';
 
   @override
-  String get libraryFolder => 'Library Folder';
+  String get libraryFolder => 'Папка библиотеки';
 
   @override
-  String get libraryFolderHint => 'Tap to select folder';
+  String get libraryFolderHint => 'Нажмите, чтобы выбрать папку';
 
   @override
-  String get libraryShowDuplicateIndicator => 'Show Duplicate Indicator';
+  String get libraryShowDuplicateIndicator => 'Показать индикатор дубликатов';
 
   @override
   String get libraryShowDuplicateIndicatorSubtitle =>
-      'Show when searching for existing tracks';
+      'Показать при поиске существующих треков';
 
   @override
-  String get libraryActions => 'Actions';
+  String get libraryActions => 'Действия';
 
   @override
-  String get libraryScan => 'Scan Library';
+  String get libraryScan => 'Сканировать библиотеку';
 
   @override
-  String get libraryScanSubtitle => 'Scan for audio files';
+  String get libraryScanSubtitle => 'Сканировать аудио файлы';
 
   @override
-  String get libraryScanSelectFolderFirst => 'Select a folder first';
+  String get libraryScanSelectFolderFirst => 'Сначала выберите папку';
 
   @override
-  String get libraryCleanupMissingFiles => 'Cleanup Missing Files';
+  String get libraryCleanupMissingFiles => 'Очистка отсутствующих файлов';
 
   @override
   String get libraryCleanupMissingFilesSubtitle =>
-      'Remove entries for files that no longer exist';
+      'Удалить записи для файлов, которых больше не существует';
 
   @override
-  String get libraryClear => 'Clear Library';
+  String get libraryClear => 'Очистить библиотеку';
 
   @override
-  String get libraryClearSubtitle => 'Remove all scanned tracks';
+  String get libraryClearSubtitle => 'Удалить все сканированные треки';
 
   @override
-  String get libraryClearConfirmTitle => 'Clear Library';
+  String get libraryClearConfirmTitle => 'Очистить библиотеку';
 
   @override
   String get libraryClearConfirmMessage =>
-      'This will remove all scanned tracks from your library. Your actual music files will not be deleted.';
+      'Это удалит все сканированные треки из вашей библиотеки. Ваши фактические файлы не будут удалены.';
 
   @override
-  String get libraryAbout => 'About Local Library';
+  String get libraryAbout => 'О локальной библиотеке';
 
   @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.';
+      'Сканирует существующую коллекцию музыки для обнаружения дубликатов при загрузке. Поддерживает форматы FLAC, M4A, MP3, Opus и OGG. Метаданные читаются из тегов файлов, если доступны.';
 
   @override
   String libraryTracksCount(int count) {
-    return '$count tracks';
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'треков',
+      many: 'треков',
+      few: 'трека',
+      one: 'трек',
+    );
+    return '$count $_temp0';
   }
 
   @override
   String libraryLastScanned(String time) {
-    return 'Last scanned: $time';
+    return 'Последнее сканирование: $time';
   }
 
   @override
-  String get libraryLastScannedNever => 'Never';
+  String get libraryLastScannedNever => 'Никогда';
 
   @override
-  String get libraryScanning => 'Scanning...';
+  String get libraryScanning => 'Сканирование...';
 
   @override
   String libraryScanProgress(String progress, int total) {
-    return '$progress% of $total files';
+    return '$progress% из $total файлов';
   }
 
   @override
-  String get libraryInLibrary => 'In Library';
+  String get libraryInLibrary => 'В библиотеке';
 
   @override
   String libraryRemovedMissingFiles(int count) {
-    return 'Removed $count missing files from library';
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'отсутствующих файлов',
+      many: 'отсутствующих файлов',
+      few: 'трека',
+      one: 'отсутствующий файл',
+    );
+    return 'Удалено $count $_temp0 в библиотеке';
   }
 
   @override
-  String get libraryCleared => 'Library cleared';
+  String get libraryCleared => 'Библиотека очищена';
 
   @override
-  String get libraryStorageAccessRequired => 'Storage Access Required';
+  String get libraryStorageAccessRequired => 'Требуется доступ к хранилищу';
 
   @override
   String get libraryStorageAccessMessage =>
-      'SpotiFLAC needs storage access to scan your music library. Please grant permission in settings.';
+      'SpotiFLAC требуется доступ к хранилищу для сканирования вашей библиотеки музыки. Пожалуйста, предоставьте разрешение в настройках.';
 
   @override
-  String get libraryFolderNotExist => 'Selected folder does not exist';
+  String get libraryFolderNotExist => 'Выбранной папки не существует';
 
   @override
-  String get librarySourceDownloaded => 'Downloaded';
+  String get librarySourceDownloaded => 'Скачанные';
 
   @override
-  String get librarySourceLocal => 'Local';
+  String get librarySourceLocal => 'Локальные';
 
   @override
-  String get libraryFilterAll => 'All';
+  String get libraryFilterAll => 'Все';
 
   @override
-  String get libraryFilterDownloaded => 'Downloaded';
+  String get libraryFilterDownloaded => 'Скачанные';
 
   @override
-  String get libraryFilterLocal => 'Local';
+  String get libraryFilterLocal => 'Локальные';
 
   @override
-  String get libraryFilterTitle => 'Filters';
+  String get libraryFilterTitle => 'Фильтры';
 
   @override
-  String get libraryFilterReset => 'Reset';
+  String get libraryFilterReset => 'Сброс';
 
   @override
-  String get libraryFilterApply => 'Apply';
+  String get libraryFilterApply => 'Применить';
 
   @override
-  String get libraryFilterSource => 'Source';
+  String get libraryFilterSource => 'Источник';
 
   @override
-  String get libraryFilterQuality => 'Quality';
+  String get libraryFilterQuality => 'Качество';
 
   @override
-  String get libraryFilterQualityHiRes => 'Hi-Res (24bit)';
+  String get libraryFilterQualityHiRes => 'Hi-Res (24 бит)';
 
   @override
-  String get libraryFilterQualityCD => 'CD (16bit)';
+  String get libraryFilterQualityCD => 'CD (16 бит)';
 
   @override
-  String get libraryFilterQualityLossy => 'Lossy';
+  String get libraryFilterQualityLossy => 'С потерями';
 
   @override
-  String get libraryFilterFormat => 'Format';
+  String get libraryFilterFormat => 'Формат';
 
   @override
-  String get libraryFilterDate => 'Date Added';
+  String get libraryFilterDate => 'Дата добавления';
 
   @override
-  String get libraryFilterDateToday => 'Today';
+  String get libraryFilterDateToday => 'Сегодня';
 
   @override
-  String get libraryFilterDateWeek => 'This Week';
+  String get libraryFilterDateWeek => 'На этой неделе';
 
   @override
-  String get libraryFilterDateMonth => 'This Month';
+  String get libraryFilterDateMonth => 'В этом месяце';
 
   @override
-  String get libraryFilterDateYear => 'This Year';
+  String get libraryFilterDateYear => 'В этом году';
 
   @override
-  String get libraryFilterSort => 'Sort';
+  String get libraryFilterSort => 'Сортировка';
 
   @override
-  String get libraryFilterSortLatest => 'Latest';
+  String get libraryFilterSortLatest => 'Последние';
 
   @override
-  String get libraryFilterSortOldest => 'Oldest';
+  String get libraryFilterSortOldest => 'Старые';
 
   @override
   String libraryFilterActive(int count) {
-    return '$count filter(s) active';
+    return '$count фильтр(-ов) активно';
   }
 
   @override
-  String get timeJustNow => 'Just now';
+  String get timeJustNow => 'Только что';
 
   @override
   String timeMinutesAgo(int count) {
     String _temp0 = intl.Intl.pluralLogic(
       count,
       locale: localeName,
-      other: '$count minutes ago',
-      one: '1 minute ago',
+      other: '$count минут',
+      many: '$count минут',
+      few: '$count минуты',
+      one: '$count минуту',
     );
-    return '$_temp0';
+    return '$_temp0 назад';
   }
 
   @override
@@ -2544,160 +2579,186 @@ class AppLocalizationsRu extends AppLocalizations {
     String _temp0 = intl.Intl.pluralLogic(
       count,
       locale: localeName,
-      other: '$count hours ago',
-      one: '1 hour ago',
+      other: '$count часов',
+      many: '$count часов',
+      few: '$count часа',
+      one: '$count час',
     );
-    return '$_temp0';
+    return '$_temp0 назад';
   }
 
   @override
-  String get storageSwitchTitle => 'Switch Storage Mode';
+  String get storageSwitchTitle => 'Сменить режим хранения';
 
   @override
-  String get storageSwitchToSafTitle => 'Switch to SAF Storage?';
+  String get storageSwitchToSafTitle => 'Переключиться на SAF хранилище?';
 
   @override
-  String get storageSwitchToAppTitle => 'Switch to App Storage?';
+  String get storageSwitchToAppTitle => 'Переключиться хранилище приложения?';
 
   @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.';
+      'Ваши скачанные файлы останутся в текущем расположении и будут доступны.\n\nНовые файлы будут сохранены в выбранной вами папке SAF.';
 
   @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.';
+      'Ваши скачанные файлы останутся в текущем выбранной вами папке SAF.\n\nНовые файлы будут сохранены в папке Music/SpotiFLAC.';
 
   @override
-  String get storageSwitchExistingDownloads => 'Existing Downloads';
+  String get storageSwitchExistingDownloads => 'Существующие загрузки';
 
   @override
   String storageSwitchExistingDownloadsInfo(int count, String mode) {
-    return '$count tracks in $mode storage';
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count треков',
+      many: '$count треков',
+      few: '$count трека',
+      one: '$count трек',
+    );
+    return '$_temp0 в $mode хранилище';
   }
 
   @override
-  String get storageSwitchNewDownloads => 'New Downloads';
+  String get storageSwitchNewDownloads => 'Новые загрузки';
 
   @override
   String storageSwitchNewDownloadsLocation(String location) {
-    return 'Will be saved to: $location';
+    return 'Будет сохранено в: $location';
   }
 
   @override
-  String get storageSwitchContinue => 'Continue';
+  String get storageSwitchContinue => 'Продолжить';
 
   @override
-  String get storageSwitchSelectFolder => 'Select SAF Folder';
+  String get storageSwitchSelectFolder => 'Выберите папку SAF';
 
   @override
-  String get storageAppStorage => 'App Storage';
+  String get storageAppStorage => 'Хранилище приложения';
 
   @override
-  String get storageSafStorage => 'SAF Storage';
+  String get storageSafStorage => 'Хранилище SAF';
 
   @override
   String storageModeBadge(String mode) {
-    return 'Storage: $mode';
+    return 'Хранилище: $mode';
   }
 
   @override
-  String get storageStatsTitle => 'Storage Statistics';
+  String get storageStatsTitle => 'Статистика хранилища';
 
   @override
   String storageStatsAppCount(int count) {
-    return '$count tracks in App Storage';
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count треков',
+      many: '$count треков',
+      few: '$count трека',
+      one: '$count трек',
+    );
+    return '$_temp0 в хранилище приложения';
   }
 
   @override
   String storageStatsSafCount(int count) {
-    return '$count tracks in SAF Storage';
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count треков',
+      many: '$count треков',
+      few: '$count трека',
+      one: '$count трек',
+    );
+    return '$_temp0 в вашей папке в SAF';
   }
 
   @override
-  String get storageModeInfo => 'Your files are stored in multiple locations';
+  String get storageModeInfo => 'Ваши файлы хранятся в нескольких местах';
 
   @override
-  String get tutorialWelcomeTitle => 'Welcome to SpotiFLAC!';
+  String get tutorialWelcomeTitle => 'Добро пожаловать в 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.';
+      'Давайте научимся скачивать свою любимую музыку в качестве без потерь. В этом кратком руководстве мы покажем вам основы.';
 
   @override
   String get tutorialWelcomeTip1 =>
-      'Download music from Spotify, Deezer, or paste any supported URL';
+      'Скачивайте музыку из Spotify, Deezer, или вставьте любой поддерживаемый URL';
 
   @override
   String get tutorialWelcomeTip2 =>
-      'Get FLAC quality audio from Tidal, Qobuz, or Amazon Music';
+      'Скачайте FLAC с Tidal, Qobuz или Amazon Music';
 
   @override
   String get tutorialWelcomeTip3 =>
-      'Automatic metadata, cover art, and lyrics embedding';
+      'Автоматическое встраивание метаданных, обложек и текстов песен';
 
   @override
-  String get tutorialSearchTitle => 'Finding Music';
+  String get tutorialSearchTitle => 'Поиск музыки';
 
   @override
   String get tutorialSearchDesc =>
-      'There are two easy ways to find music you want to download.';
+      'Есть два простых способа найти музыку, которую вы хотите скачать.';
 
   @override
   String get tutorialSearchTip1 =>
-      'Paste a Spotify or Deezer URL directly in the search box';
+      'Вставьте ссылку Spotify или Deezer прямо в поле поиска';
 
   @override
   String get tutorialSearchTip2 =>
-      'Or type the song name, artist, or album to search';
+      'Или введите название песни, исполнителя или альбом для поиска';
 
   @override
   String get tutorialSearchTip3 =>
-      'Supports tracks, albums, playlists, and artist pages';
+      'Поддержка треков, альбомов, плейлистов и страниц исполнителей';
 
   @override
-  String get tutorialDownloadTitle => 'Downloading Music';
+  String get tutorialDownloadTitle => 'Скачивание музыки';
 
   @override
   String get tutorialDownloadDesc =>
-      'Downloading music is simple and fast. Here\'s how it works.';
+      'Скачивание музыки просто и быстро. Вот как это работает.';
 
   @override
   String get tutorialDownloadTip1 =>
-      'Tap the download button next to any track to start downloading';
+      'Нажмите кнопку скачать рядом с любым треком, чтобы начать скачивание';
 
   @override
   String get tutorialDownloadTip2 =>
-      'Choose your preferred quality (FLAC, Hi-Res, or MP3)';
+      'Выберите предпочитаемое качество (FLAC, Hi-Res или MP3)';
 
   @override
   String get tutorialDownloadTip3 =>
-      'Download entire albums or playlists with one tap';
+      'Скачать все альбомы или плейлисты одним нажатием';
 
   @override
-  String get tutorialLibraryTitle => 'Your Library';
+  String get tutorialLibraryTitle => 'Ваша библиотека';
 
   @override
   String get tutorialLibraryDesc =>
-      'All your downloaded music is organized in the Library tab.';
+      'Вся скачанная музыка организована во вкладке Библиотека.';
 
   @override
   String get tutorialLibraryTip1 =>
-      'View download progress and queue in the Library tab';
+      'Просмотр прогресса загрузки и очереди на вкладке Библиотека';
 
   @override
   String get tutorialLibraryTip2 =>
-      'Tap any track to play it with your music player';
+      'Нажмите на любой трек, чтобы воспроизвести его с помощью вашего музыкального плеера';
 
   @override
   String get tutorialLibraryTip3 =>
-      'Switch between list and grid view for better browsing';
+      'Переключение между списком и сеткой для лучшего просмотра';
 
   @override
-  String get tutorialExtensionsTitle => 'Extensions';
+  String get tutorialExtensionsTitle => 'Расширения';
 
   @override
   String get tutorialExtensionsDesc =>
-      'Extend the app\'s capabilities with community extensions.';
+      'Расширьте возможности приложения с расширениями от сообщества.';
 
   @override
   String get tutorialExtensionsTip1 =>
@@ -2705,14 +2766,14 @@ class AppLocalizationsRu extends AppLocalizations {
 
   @override
   String get tutorialExtensionsTip2 =>
-      'Add new download providers or search sources';
+      'Добавить новых поставщиков загрузок или поиска';
 
   @override
   String get tutorialExtensionsTip3 =>
       'Get lyrics, enhanced metadata, and more features';
 
   @override
-  String get tutorialSettingsTitle => 'Customize Your Experience';
+  String get tutorialSettingsTitle => 'Настройте приложение под себя';
 
   @override
   String get tutorialSettingsDesc =>
@@ -2720,27 +2781,28 @@ class AppLocalizationsRu extends AppLocalizations {
 
   @override
   String get tutorialSettingsTip1 =>
-      'Change download location and folder organization';
+      'Изменить местоположение и организацию папок для скачивания';
 
   @override
   String get tutorialSettingsTip2 =>
-      'Set default audio quality and format preferences';
+      'Настройте качество и формата аудиофайла по умолчанию';
 
   @override
-  String get tutorialSettingsTip3 => 'Customize app theme and appearance';
+  String get tutorialSettingsTip3 => 'Настроить тему и внешний вид приложения';
 
   @override
   String get tutorialReadyMessage =>
-      'You\'re all set! Start downloading your favorite music now.';
+      'Всё готово! Начните загружать любимую музыку прямо сейчас.';
 
   @override
   String get tutorialExample => 'EXAMPLE';
 
   @override
-  String get libraryForceFullScan => 'Force Full Scan';
+  String get libraryForceFullScan => 'Полное сканирование';
 
   @override
-  String get libraryForceFullScanSubtitle => 'Rescan all files, ignoring cache';
+  String get libraryForceFullScanSubtitle =>
+      'Пересканировать все файлы, игнорировать кэш';
 
   @override
   String get cleanupOrphanedDownloads => 'Cleanup Orphaned Downloads';
@@ -2758,10 +2820,10 @@ class AppLocalizationsRu extends AppLocalizations {
   String get cleanupOrphanedDownloadsNone => 'No orphaned entries found';
 
   @override
-  String get cacheTitle => 'Storage & Cache';
+  String get cacheTitle => 'Хранилище и кэш';
 
   @override
-  String get cacheSummaryTitle => 'Cache overview';
+  String get cacheSummaryTitle => 'Просмотр кэша';
 
   @override
   String get cacheSummarySubtitle =>
@@ -2773,13 +2835,13 @@ class AppLocalizationsRu extends AppLocalizations {
   }
 
   @override
-  String get cacheSectionStorage => 'Cached Data';
+  String get cacheSectionStorage => 'Кэшированные данные';
 
   @override
   String get cacheSectionMaintenance => 'Maintenance';
 
   @override
-  String get cacheAppDirectory => 'App cache directory';
+  String get cacheAppDirectory => 'Папка кэша приложения';
 
   @override
   String get cacheAppDirectoryDesc =>
@@ -2825,11 +2887,11 @@ class AppLocalizationsRu extends AppLocalizations {
       'Remove orphaned download history and library entries for missing files.';
 
   @override
-  String get cacheNoData => 'No cached data';
+  String get cacheNoData => 'Нет кэшированных данных';
 
   @override
   String cacheSizeWithFiles(String size, int count) {
-    return '$size in $count files';
+    return '$size в $count файлах';
   }
 
   @override
@@ -2844,11 +2906,11 @@ class AppLocalizationsRu extends AppLocalizations {
 
   @override
   String cacheClearSuccess(String target) {
-    return 'Cleared: $target';
+    return 'Очищено: $target';
   }
 
   @override
-  String get cacheClearConfirmTitle => 'Clear cache?';
+  String get cacheClearConfirmTitle => 'Очистить кэш?';
 
   @override
   String cacheClearConfirmMessage(String target) {
@@ -2856,17 +2918,17 @@ class AppLocalizationsRu extends AppLocalizations {
   }
 
   @override
-  String get cacheClearAllConfirmTitle => 'Clear all cache?';
+  String get cacheClearAllConfirmTitle => 'Очистить весь кэш?';
 
   @override
   String get cacheClearAllConfirmMessage =>
-      'This will clear all cache categories on this page. Downloaded music files will not be deleted.';
+      'Это очистит все категории кэша на этой странице. Скачанные музыкальные файлы не будут удалены.';
 
   @override
-  String get cacheClearAll => 'Clear all cache';
+  String get cacheClearAll => 'Очистить весь кэш';
 
   @override
-  String get cacheCleanupUnused => 'Cleanup unused data';
+  String get cacheCleanupUnused => 'Очистка неиспользуемых данных';
 
   @override
   String get cacheCleanupUnusedSubtitle =>
@@ -2878,19 +2940,23 @@ class AppLocalizationsRu extends AppLocalizations {
   }
 
   @override
-  String get cacheRefreshStats => 'Refresh stats';
+  String get cacheRefreshStats => 'Обновить статистику';
 
   @override
-  String get trackSaveCoverArt => 'Save Cover Art';
+  String get trackSaveCoverArt => 'Сохранить обложку';
 
   @override
-  String get trackSaveCoverArtSubtitle => 'Save album art as .jpg file';
+  String get trackSaveCoverArtSubtitle => 'Сохранить обложку как файл .jpg';
 
   @override
-  String get trackSaveLyrics => 'Save Lyrics (.lrc)';
+  String get trackSaveLyrics => 'Сохранить текст (.lrc)';
 
   @override
-  String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
+  String get trackSaveLyricsSubtitle =>
+      'Получить и сохранить текст песни в формате .lrc';
+
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
 
   @override
   String get trackReEnrich => 'Re-enrich Metadata';
@@ -2904,35 +2970,74 @@ class AppLocalizationsRu extends AppLocalizations {
       'Search metadata online and embed into file';
 
   @override
-  String get trackEditMetadata => 'Edit Metadata';
+  String get trackEditMetadata => 'Редактировать метаданные';
 
   @override
   String trackCoverSaved(String fileName) {
-    return 'Cover art saved to $fileName';
+    return 'Обложка сохранена в $fileName';
   }
 
   @override
-  String get trackCoverNoSource => 'No cover art source available';
+  String get trackCoverNoSource => 'Нет доступных источников обложки';
 
   @override
   String trackLyricsSaved(String fileName) {
-    return 'Lyrics saved to $fileName';
+    return 'Текст песни сохранен в $fileName';
   }
 
   @override
   String get trackReEnrichProgress => 'Re-enriching metadata...';
 
   @override
-  String get trackReEnrichSearching => 'Searching metadata online...';
+  String get trackReEnrichSearching => 'Поиск метаданных в сети...';
 
   @override
   String get trackReEnrichSuccess => 'Metadata re-enriched successfully';
 
   @override
-  String get trackReEnrichFfmpegFailed => 'FFmpeg metadata embed failed';
+  String get trackReEnrichFfmpegFailed =>
+      'Ошибка встраивания метаданных FFmpeg';
 
   @override
   String trackSaveFailed(String error) {
-    return 'Failed: $error';
+    return 'Ошибка: $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';
 }

lib/l10n/app_localizations_tr.dart

@@ -464,12 +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';
 
@@ -1195,6 +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';
 
@@ -1960,6 +1961,17 @@ class AppLocalizationsTr extends AppLocalizations {
   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';
 
@@ -2861,6 +2873,9 @@ class AppLocalizationsTr extends AppLocalizations {
   @override
   String get trackSaveLyricsSubtitle => 'Fetch and save lyrics as .lrc file';
 
+  @override
+  String get trackSaveLyricsProgress => 'Saving lyrics...';
+
   @override
   String get trackReEnrich => 'Re-enrich Metadata';
 
@@ -2904,4 +2919,42 @@ class AppLocalizationsTr extends AppLocalizations {
   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';
 }

lib/l10n/arb/app_en.arb

@@ -326,10 +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",
@@ -878,6 +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"},
@@ -1431,6 +1435,12 @@
   "@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",
@@ -2144,6 +2154,8 @@
   "@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",
@@ -2182,5 +2194,38 @@
     "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"}
 }

lib/l10n/arb/app_es.arb

@@ -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"

lib/l10n/arb/app_pt.arb

@@ -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"

lib/l10n/arb/app_zh.arb

@@ -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"

lib/main.dart

@@ -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';
@@ -11,12 +12,70 @@ import 'package:spotiflac_android/services/cover_cache_manager.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
+  final runtimeProfile = await _resolveRuntimeProfile();
+  _configureImageCache(runtimeProfile);
 
   runApp(
-    ProviderScope(child: const _EagerInitialization(child: SpotiFLACApp())),
+    ProviderScope(
+      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});

lib/models/settings.dart

@@ -20,6 +20,8 @@ class AppSettings {
   final bool hasSearchedBefore;
   final String folderOrganization;
   final bool useAlbumArtistForFolders;
+  final bool usePrimaryArtistOnly; // Strip featured artists from folder name
+  final bool filterContributingArtistsInAlbumArtist;
   final String historyViewMode;
   final String historyFilterMode;
   final bool askQualityBeforeDownload;
@@ -35,18 +37,36 @@ class AppSettings {
   final bool showExtensionStore;
   final String locale;
   final String lyricsMode;
-  final String tidalHighFormat; // Format for Tidal HIGH quality: 'mp3_320', 'opus_256', or 'opus_128'
-  final bool useAllFilesAccess; // Android 13+ only: enable MANAGE_EXTERNAL_STORAGE
-  final bool autoExportFailedDownloads; // Auto export failed downloads to TXT file
-  final String downloadNetworkMode; // 'any' = WiFi + Mobile, 'wifi_only' = WiFi only
-  
+  final String
+  tidalHighFormat; // Format for Tidal HIGH quality: 'mp3_320', 'opus_256', or 'opus_128'
+  final bool
+  useAllFilesAccess; // Android 13+ only: enable MANAGE_EXTERNAL_STORAGE
+  final bool
+  autoExportFailedDownloads; // Auto export failed downloads to TXT file
+  final String
+  downloadNetworkMode; // 'any' = WiFi + Mobile, 'wifi_only' = WiFi only
+
   // Local Library Settings
   final bool localLibraryEnabled; // Enable local library scanning
   final String localLibraryPath; // Path to scan for audio files
-  final bool localLibraryShowDuplicates; // Show indicator when searching for existing tracks
-  
+  final bool
+  localLibraryShowDuplicates; // Show indicator when searching for existing tracks
+
   // Tutorial/Onboarding
-  final bool hasCompletedTutorial; // Track if user has completed the app tutorial
+  final bool
+  hasCompletedTutorial; // Track if user has completed the app tutorial
+
+  // Lyrics Provider Settings
+  final List<String>
+  lyricsProviders; // Ordered list of enabled lyrics provider IDs
+  final bool
+  lyricsIncludeTranslationNetease; // Append translated lyrics (Netease)
+  final bool
+  lyricsIncludeRomanizationNetease; // Append romanized lyrics (Netease)
+  final bool
+  lyricsMultiPersonWordByWord; // Enable v1/v2 + [bg:] tags for Apple/QQ syllable lyrics
+  final String
+  musixmatchLanguage; // Optional ISO language code for Musixmatch localized lyrics
 
   const AppSettings({
     this.defaultService = 'tidal',
@@ -65,6 +85,8 @@ class AppSettings {
     this.hasSearchedBefore = false,
     this.folderOrganization = 'none',
     this.useAlbumArtistForFolders = true,
+    this.usePrimaryArtistOnly = false,
+    this.filterContributingArtistsInAlbumArtist = false,
     this.historyViewMode = 'grid',
     this.historyFilterMode = 'all',
     this.askQualityBeforeDownload = true,
@@ -90,6 +112,12 @@ class AppSettings {
     this.localLibraryShowDuplicates = true,
     // Tutorial default
     this.hasCompletedTutorial = false,
+    // Lyrics providers default order
+    this.lyricsProviders = const ['lrclib', 'musixmatch', 'netease', 'apple_music', 'qqmusic'],
+    this.lyricsIncludeTranslationNetease = false,
+    this.lyricsIncludeRomanizationNetease = false,
+    this.lyricsMultiPersonWordByWord = true,
+    this.musixmatchLanguage = '',
   });
 
   AppSettings copyWith({
@@ -109,6 +137,8 @@ class AppSettings {
     bool? hasSearchedBefore,
     String? folderOrganization,
     bool? useAlbumArtistForFolders,
+    bool? usePrimaryArtistOnly,
+    bool? filterContributingArtistsInAlbumArtist,
     String? historyViewMode,
     String? historyFilterMode,
     bool? askQualityBeforeDownload,
@@ -135,6 +165,12 @@ class AppSettings {
     bool? localLibraryShowDuplicates,
     // Tutorial
     bool? hasCompletedTutorial,
+    // Lyrics providers
+    List<String>? lyricsProviders,
+    bool? lyricsIncludeTranslationNetease,
+    bool? lyricsIncludeRomanizationNetease,
+    bool? lyricsMultiPersonWordByWord,
+    String? musixmatchLanguage,
   }) {
     return AppSettings(
       defaultService: defaultService ?? this.defaultService,
@@ -154,16 +190,25 @@ class AppSettings {
       folderOrganization: folderOrganization ?? this.folderOrganization,
       useAlbumArtistForFolders:
           useAlbumArtistForFolders ?? this.useAlbumArtistForFolders,
+      usePrimaryArtistOnly: usePrimaryArtistOnly ?? this.usePrimaryArtistOnly,
+      filterContributingArtistsInAlbumArtist:
+          filterContributingArtistsInAlbumArtist ??
+          this.filterContributingArtistsInAlbumArtist,
       historyViewMode: historyViewMode ?? this.historyViewMode,
       historyFilterMode: historyFilterMode ?? this.historyFilterMode,
-      askQualityBeforeDownload: askQualityBeforeDownload ?? this.askQualityBeforeDownload,
+      askQualityBeforeDownload:
+          askQualityBeforeDownload ?? this.askQualityBeforeDownload,
       spotifyClientId: spotifyClientId ?? this.spotifyClientId,
       spotifyClientSecret: spotifyClientSecret ?? this.spotifyClientSecret,
-      useCustomSpotifyCredentials: useCustomSpotifyCredentials ?? this.useCustomSpotifyCredentials,
+      useCustomSpotifyCredentials:
+          useCustomSpotifyCredentials ?? this.useCustomSpotifyCredentials,
       metadataSource: metadataSource ?? this.metadataSource,
       enableLogging: enableLogging ?? this.enableLogging,
-      useExtensionProviders: useExtensionProviders ?? this.useExtensionProviders,
-      searchProvider: clearSearchProvider ? null : (searchProvider ?? this.searchProvider),
+      useExtensionProviders:
+          useExtensionProviders ?? this.useExtensionProviders,
+      searchProvider: clearSearchProvider
+          ? null
+          : (searchProvider ?? this.searchProvider),
       separateSingles: separateSingles ?? this.separateSingles,
       albumFolderStructure: albumFolderStructure ?? this.albumFolderStructure,
       showExtensionStore: showExtensionStore ?? this.showExtensionStore,
@@ -171,14 +216,25 @@ class AppSettings {
       lyricsMode: lyricsMode ?? this.lyricsMode,
       tidalHighFormat: tidalHighFormat ?? this.tidalHighFormat,
       useAllFilesAccess: useAllFilesAccess ?? this.useAllFilesAccess,
-      autoExportFailedDownloads: autoExportFailedDownloads ?? this.autoExportFailedDownloads,
+      autoExportFailedDownloads:
+          autoExportFailedDownloads ?? this.autoExportFailedDownloads,
       downloadNetworkMode: downloadNetworkMode ?? this.downloadNetworkMode,
       // Local Library
       localLibraryEnabled: localLibraryEnabled ?? this.localLibraryEnabled,
       localLibraryPath: localLibraryPath ?? this.localLibraryPath,
-      localLibraryShowDuplicates: localLibraryShowDuplicates ?? this.localLibraryShowDuplicates,
+      localLibraryShowDuplicates:
+          localLibraryShowDuplicates ?? this.localLibraryShowDuplicates,
       // Tutorial
       hasCompletedTutorial: hasCompletedTutorial ?? this.hasCompletedTutorial,
+      // Lyrics providers
+      lyricsProviders: lyricsProviders ?? this.lyricsProviders,
+      lyricsIncludeTranslationNetease:
+          lyricsIncludeTranslationNetease ?? this.lyricsIncludeTranslationNetease,
+      lyricsIncludeRomanizationNetease:
+          lyricsIncludeRomanizationNetease ?? this.lyricsIncludeRomanizationNetease,
+      lyricsMultiPersonWordByWord:
+          lyricsMultiPersonWordByWord ?? this.lyricsMultiPersonWordByWord,
+      musixmatchLanguage: musixmatchLanguage ?? this.musixmatchLanguage,
     );
   }
 

lib/models/settings.g.dart

@@ -23,6 +23,9 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
   hasSearchedBefore: json['hasSearchedBefore'] as bool? ?? false,
   folderOrganization: json['folderOrganization'] as String? ?? 'none',
   useAlbumArtistForFolders: json['useAlbumArtistForFolders'] as bool? ?? true,
+  usePrimaryArtistOnly: json['usePrimaryArtistOnly'] as bool? ?? false,
+  filterContributingArtistsInAlbumArtist:
+      json['filterContributingArtistsInAlbumArtist'] as bool? ?? false,
   historyViewMode: json['historyViewMode'] as String? ?? 'grid',
   historyFilterMode: json['historyFilterMode'] as String? ?? 'all',
   askQualityBeforeDownload: json['askQualityBeforeDownload'] as bool? ?? true,
@@ -50,47 +53,68 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
   localLibraryShowDuplicates:
       json['localLibraryShowDuplicates'] as bool? ?? true,
   hasCompletedTutorial: json['hasCompletedTutorial'] as bool? ?? false,
+  lyricsProviders:
+      (json['lyricsProviders'] as List<dynamic>?)
+          ?.map((e) => e as String)
+          .toList() ??
+      const ['lrclib', 'musixmatch', 'netease', 'apple_music', 'qqmusic'],
+  lyricsIncludeTranslationNetease:
+      json['lyricsIncludeTranslationNetease'] as bool? ?? false,
+  lyricsIncludeRomanizationNetease:
+      json['lyricsIncludeRomanizationNetease'] as bool? ?? false,
+  lyricsMultiPersonWordByWord:
+      json['lyricsMultiPersonWordByWord'] as bool? ?? true,
+  musixmatchLanguage: json['musixmatchLanguage'] as String? ?? '',
 );
 
-Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
-    <String, dynamic>{
-      'defaultService': instance.defaultService,
-      'audioQuality': instance.audioQuality,
-      'filenameFormat': instance.filenameFormat,
-      'downloadDirectory': instance.downloadDirectory,
-      'storageMode': instance.storageMode,
-      'downloadTreeUri': instance.downloadTreeUri,
-      'autoFallback': instance.autoFallback,
-      'embedLyrics': instance.embedLyrics,
-      'maxQualityCover': instance.maxQualityCover,
-      'isFirstLaunch': instance.isFirstLaunch,
-      'concurrentDownloads': instance.concurrentDownloads,
-      'checkForUpdates': instance.checkForUpdates,
-      'updateChannel': instance.updateChannel,
-      'hasSearchedBefore': instance.hasSearchedBefore,
-      'folderOrganization': instance.folderOrganization,
-      'useAlbumArtistForFolders': instance.useAlbumArtistForFolders,
-      'historyViewMode': instance.historyViewMode,
-      'historyFilterMode': instance.historyFilterMode,
-      'askQualityBeforeDownload': instance.askQualityBeforeDownload,
-      'spotifyClientId': instance.spotifyClientId,
-      'spotifyClientSecret': instance.spotifyClientSecret,
-      'useCustomSpotifyCredentials': instance.useCustomSpotifyCredentials,
-      'metadataSource': instance.metadataSource,
-      'enableLogging': instance.enableLogging,
-      'useExtensionProviders': instance.useExtensionProviders,
-      'searchProvider': instance.searchProvider,
-      'separateSingles': instance.separateSingles,
-      'albumFolderStructure': instance.albumFolderStructure,
-      'showExtensionStore': instance.showExtensionStore,
-      'locale': instance.locale,
-      'lyricsMode': instance.lyricsMode,
-      'tidalHighFormat': instance.tidalHighFormat,
-      'useAllFilesAccess': instance.useAllFilesAccess,
-      'autoExportFailedDownloads': instance.autoExportFailedDownloads,
-      'downloadNetworkMode': instance.downloadNetworkMode,
-      'localLibraryEnabled': instance.localLibraryEnabled,
-      'localLibraryPath': instance.localLibraryPath,
-      'localLibraryShowDuplicates': instance.localLibraryShowDuplicates,
-      'hasCompletedTutorial': instance.hasCompletedTutorial,
-    };
+Map<String, dynamic> _$AppSettingsToJson(
+  AppSettings instance,
+) => <String, dynamic>{
+  'defaultService': instance.defaultService,
+  'audioQuality': instance.audioQuality,
+  'filenameFormat': instance.filenameFormat,
+  'downloadDirectory': instance.downloadDirectory,
+  'storageMode': instance.storageMode,
+  'downloadTreeUri': instance.downloadTreeUri,
+  'autoFallback': instance.autoFallback,
+  'embedLyrics': instance.embedLyrics,
+  'maxQualityCover': instance.maxQualityCover,
+  'isFirstLaunch': instance.isFirstLaunch,
+  'concurrentDownloads': instance.concurrentDownloads,
+  'checkForUpdates': instance.checkForUpdates,
+  'updateChannel': instance.updateChannel,
+  'hasSearchedBefore': instance.hasSearchedBefore,
+  'folderOrganization': instance.folderOrganization,
+  'useAlbumArtistForFolders': instance.useAlbumArtistForFolders,
+  'usePrimaryArtistOnly': instance.usePrimaryArtistOnly,
+  'filterContributingArtistsInAlbumArtist':
+      instance.filterContributingArtistsInAlbumArtist,
+  'historyViewMode': instance.historyViewMode,
+  'historyFilterMode': instance.historyFilterMode,
+  'askQualityBeforeDownload': instance.askQualityBeforeDownload,
+  'spotifyClientId': instance.spotifyClientId,
+  'spotifyClientSecret': instance.spotifyClientSecret,
+  'useCustomSpotifyCredentials': instance.useCustomSpotifyCredentials,
+  'metadataSource': instance.metadataSource,
+  'enableLogging': instance.enableLogging,
+  'useExtensionProviders': instance.useExtensionProviders,
+  'searchProvider': instance.searchProvider,
+  'separateSingles': instance.separateSingles,
+  'albumFolderStructure': instance.albumFolderStructure,
+  'showExtensionStore': instance.showExtensionStore,
+  'locale': instance.locale,
+  'lyricsMode': instance.lyricsMode,
+  'tidalHighFormat': instance.tidalHighFormat,
+  'useAllFilesAccess': instance.useAllFilesAccess,
+  'autoExportFailedDownloads': instance.autoExportFailedDownloads,
+  'downloadNetworkMode': instance.downloadNetworkMode,
+  'localLibraryEnabled': instance.localLibraryEnabled,
+  'localLibraryPath': instance.localLibraryPath,
+  'localLibraryShowDuplicates': instance.localLibraryShowDuplicates,
+  'hasCompletedTutorial': instance.hasCompletedTutorial,
+  'lyricsProviders': instance.lyricsProviders,
+  'lyricsIncludeTranslationNetease': instance.lyricsIncludeTranslationNetease,
+  'lyricsIncludeRomanizationNetease': instance.lyricsIncludeRomanizationNetease,
+  'lyricsMultiPersonWordByWord': instance.lyricsMultiPersonWordByWord,
+  'musixmatchLanguage': instance.musixmatchLanguage,
+};

lib/providers/extension_provider.dart

@@ -26,6 +26,7 @@ class Extension {
   final List<QualityOption> qualityOptions;
   final bool hasMetadataProvider;
   final bool hasDownloadProvider;
+  final bool hasLyricsProvider;
   final bool skipMetadataEnrichment; // If true, use metadata from extension instead of enriching
   final SearchBehavior? searchBehavior;
   final URLHandler? urlHandler;
@@ -49,6 +50,7 @@ class Extension {
     this.qualityOptions = const [],
     this.hasMetadataProvider = false,
     this.hasDownloadProvider = false,
+    this.hasLyricsProvider = false,
     this.skipMetadataEnrichment = false,
     this.searchBehavior,
     this.urlHandler,
@@ -78,6 +80,7 @@ class Extension {
           .toList() ?? [],
       hasMetadataProvider: json['has_metadata_provider'] as bool? ?? false,
       hasDownloadProvider: json['has_download_provider'] as bool? ?? false,
+      hasLyricsProvider: json['has_lyrics_provider'] as bool? ?? false,
       skipMetadataEnrichment: json['skip_metadata_enrichment'] as bool? ?? false,
       searchBehavior: json['search_behavior'] != null 
           ? SearchBehavior.fromJson(json['search_behavior'] as Map<String, dynamic>)
@@ -111,6 +114,7 @@ class Extension {
     List<QualityOption>? qualityOptions,
     bool? hasMetadataProvider,
     bool? hasDownloadProvider,
+    bool? hasLyricsProvider,
     bool? skipMetadataEnrichment,
     SearchBehavior? searchBehavior,
     URLHandler? urlHandler,
@@ -134,6 +138,7 @@ class Extension {
       qualityOptions: qualityOptions ?? this.qualityOptions,
       hasMetadataProvider: hasMetadataProvider ?? this.hasMetadataProvider,
       hasDownloadProvider: hasDownloadProvider ?? this.hasDownloadProvider,
+      hasLyricsProvider: hasLyricsProvider ?? this.hasLyricsProvider,
       skipMetadataEnrichment: skipMetadataEnrichment ?? this.skipMetadataEnrichment,
       searchBehavior: searchBehavior ?? this.searchBehavior,
       urlHandler: urlHandler ?? this.urlHandler,

lib/providers/local_library_provider.dart

@@ -3,8 +3,10 @@ import 'dart:io';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
+import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/services/history_database.dart';
 import 'package:spotiflac_android/services/library_database.dart';
+import 'package:spotiflac_android/services/notification_service.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
 import 'package:spotiflac_android/utils/logger.dart';
 
@@ -12,6 +14,7 @@ final _log = AppLogger('LocalLibrary');
 
 const _lastScannedAtKey = 'local_library_last_scanned_at';
 const _excludedDownloadedCountKey = 'local_library_excluded_downloaded_count';
+final _prefs = SharedPreferences.getInstance();
 
 class LocalLibraryState {
   final List<LocalLibraryItem> items;
@@ -24,9 +27,9 @@ class LocalLibraryState {
   final bool scanWasCancelled;
   final DateTime? lastScannedAt;
   final int excludedDownloadedCount;
-  final Set<String> _isrcSet;
   final Set<String> _trackKeySet;
   final Map<String, LocalLibraryItem> _byIsrc;
+  final Map<String, LocalLibraryItem> _byTrackKey;
 
   LocalLibraryState({
     this.items = const [],
@@ -39,18 +42,22 @@ class LocalLibraryState {
     this.scanWasCancelled = false,
     this.lastScannedAt,
     this.excludedDownloadedCount = 0,
-  }) : _isrcSet = items
-           .where((item) => item.isrc != null && item.isrc!.isNotEmpty)
-           .map((item) => item.isrc!)
-           .toSet(),
-       _trackKeySet = items.map((item) => item.matchKey).toSet(),
-       _byIsrc = Map.fromEntries(
-         items
-             .where((item) => item.isrc != null && item.isrc!.isNotEmpty)
-             .map((item) => MapEntry(item.isrc!, item)),
-       );
+    Set<String>? trackKeySet,
+    Map<String, LocalLibraryItem>? byIsrc,
+    Map<String, LocalLibraryItem>? byTrackKey,
+  }) : _trackKeySet = trackKeySet ?? items.map((item) => item.matchKey).toSet(),
+       _byIsrc =
+           byIsrc ??
+           Map.fromEntries(
+             items
+                 .where((item) => item.isrc != null && item.isrc!.isNotEmpty)
+                 .map((item) => MapEntry(item.isrc!, item)),
+           ),
+       _byTrackKey =
+           byTrackKey ??
+           Map.fromEntries(items.map((item) => MapEntry(item.matchKey, item)));
 
-  bool hasIsrc(String isrc) => _isrcSet.contains(isrc);
+  bool hasIsrc(String isrc) => _byIsrc.containsKey(isrc);
 
   bool hasTrack(String trackName, String artistName) {
     final key = '${trackName.toLowerCase()}|${artistName.toLowerCase()}';
@@ -61,7 +68,7 @@ class LocalLibraryState {
 
   LocalLibraryItem? findByTrackAndArtist(String trackName, String artistName) {
     final key = '${trackName.toLowerCase()}|${artistName.toLowerCase()}';
-    return items.where((item) => item.matchKey == key).firstOrNull;
+    return _byTrackKey[key];
   }
 
   bool existsInLibrary({String? isrc, String? trackName, String? artistName}) {
@@ -86,8 +93,11 @@ class LocalLibraryState {
     DateTime? lastScannedAt,
     int? excludedDownloadedCount,
   }) {
+    final nextItems = items ?? this.items;
+    final keepDerivedIndex = identical(nextItems, this.items);
+
     return LocalLibraryState(
-      items: items ?? this.items,
+      items: nextItems,
       isScanning: isScanning ?? this.isScanning,
       scanProgress: scanProgress ?? this.scanProgress,
       scanCurrentFile: scanCurrentFile ?? this.scanCurrentFile,
@@ -98,6 +108,9 @@ class LocalLibraryState {
       lastScannedAt: lastScannedAt ?? this.lastScannedAt,
       excludedDownloadedCount:
           excludedDownloadedCount ?? this.excludedDownloadedCount,
+      trackKeySet: keepDerivedIndex ? _trackKeySet : null,
+      byIsrc: keepDerivedIndex ? _byIsrc : null,
+      byTrackKey: keepDerivedIndex ? _byTrackKey : null,
     );
   }
 }
@@ -105,11 +118,13 @@ class LocalLibraryState {
 class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
   final LibraryDatabase _db = LibraryDatabase.instance;
   final HistoryDatabase _historyDb = HistoryDatabase.instance;
+  final NotificationService _notificationService = NotificationService();
   static const _progressPollingInterval = Duration(milliseconds: 800);
   Timer? _progressTimer;
   bool _isLoaded = false;
   bool _scanCancelRequested = false;
   int _progressPollingErrorCount = 0;
+  bool _isProgressPollingInFlight = false;
 
   @override
   LocalLibraryState build() {
@@ -128,13 +143,17 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
     _isLoaded = true;
 
     try {
-      final jsonList = await _db.getAll();
-      final items = jsonList.map((e) => LocalLibraryItem.fromJson(e)).toList();
+      final dbItemsFuture = _db.getAll();
+      final prefsFuture = _prefs;
+      final jsonList = await dbItemsFuture;
+      final items = jsonList
+          .map((e) => LocalLibraryItem.fromJson(e))
+          .toList(growable: false);
 
       DateTime? lastScannedAt;
       var excludedDownloadedCount = 0;
       try {
-        final prefs = await SharedPreferences.getInstance();
+        final prefs = await prefsFuture;
         final lastScannedAtStr = prefs.getString(_lastScannedAtKey);
         if (lastScannedAtStr != null && lastScannedAtStr.isNotEmpty) {
           lastScannedAt = DateTime.tryParse(lastScannedAtStr);
@@ -164,6 +183,58 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
     await _loadFromDatabase();
   }
 
+  Set<String> _buildPathMatchKeys(String? filePath) {
+    final raw = filePath?.trim() ?? '';
+    if (raw.isEmpty) return const {};
+
+    final cleaned = raw.startsWith('EXISTS:') ? raw.substring(7) : raw;
+    final keys = <String>{cleaned};
+
+    void addNormalized(String value) {
+      final trimmed = value.trim();
+      if (trimmed.isEmpty) return;
+      keys.add(trimmed);
+      keys.add(trimmed.toLowerCase());
+      if (trimmed.contains('\\')) {
+        final slash = trimmed.replaceAll('\\', '/');
+        keys.add(slash);
+        keys.add(slash.toLowerCase());
+      }
+      if (trimmed.contains('%')) {
+        try {
+          final decoded = Uri.decodeFull(trimmed);
+          keys.add(decoded);
+          keys.add(decoded.toLowerCase());
+        } catch (_) {}
+      }
+    }
+
+    addNormalized(cleaned);
+
+    if (cleaned.startsWith('content://')) {
+      try {
+        final uri = Uri.parse(cleaned);
+        addNormalized(uri.toString());
+        addNormalized(uri.replace(query: null, fragment: null).toString());
+      } catch (_) {}
+    }
+
+    return keys;
+  }
+
+  bool _isDownloadedPath(String? filePath, Set<String> downloadedPathKeys) {
+    if (filePath == null || filePath.isEmpty || downloadedPathKeys.isEmpty) {
+      return false;
+    }
+    final candidateKeys = _buildPathMatchKeys(filePath);
+    for (final key in candidateKeys) {
+      if (downloadedPathKeys.contains(key)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
   Future<void> startScan(
     String folderPath, {
     bool forceFullScan = false,
@@ -186,6 +257,12 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
       scanErrorCount: 0,
       scanWasCancelled: false,
     );
+    await _showScanProgressNotification(
+      progress: 0,
+      scannedFiles: 0,
+      totalFiles: 0,
+      currentFile: null,
+    );
 
     try {
       final appSupportDir = await getApplicationSupportDirectory();
@@ -201,10 +278,26 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
     try {
       final isSaf = folderPath.startsWith('content://');
 
-      // Get all file paths from download history to exclude them
+      // Get all file paths from download history to exclude them.
+      // Merge DB + in-memory state to avoid race when a fresh download has not
+      // been flushed to SQLite yet.
       final downloadedPaths = await _historyDb.getAllFilePaths();
+      final inMemoryHistoryPaths = ref
+          .read(downloadHistoryProvider)
+          .items
+          .map((item) => item.filePath)
+          .where((path) => path.isNotEmpty);
+      final allHistoryPaths = <String>{
+        ...downloadedPaths,
+        ...inMemoryHistoryPaths,
+      };
+      final downloadedPathKeys = <String>{};
+      for (final path in allHistoryPaths) {
+        downloadedPathKeys.addAll(_buildPathMatchKeys(path));
+      }
       _log.i(
-        'Excluding ${downloadedPaths.length} downloaded files from library scan',
+        'Excluding ${allHistoryPaths.length} downloaded files from library scan '
+        '(${downloadedPathKeys.length} path keys)',
       );
 
       if (forceFullScan) {
@@ -214,6 +307,7 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
             : await PlatformBridge.scanLibraryFolder(folderPath);
         if (_scanCancelRequested) {
           state = state.copyWith(isScanning: false, scanWasCancelled: true);
+          await _showScanCancelledNotification();
           return;
         }
 
@@ -222,7 +316,7 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
         for (final json in results) {
           final filePath = json['filePath'] as String?;
           // Skip files that are already in download history
-          if (filePath != null && downloadedPaths.contains(filePath)) {
+          if (_isDownloadedPath(filePath, downloadedPathKeys)) {
             skippedDownloads++;
             continue;
           }
@@ -259,6 +353,11 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
           'Full scan complete: ${items.length} tracks found, '
           '$skippedDownloads already in downloads',
         );
+        await _showScanCompleteNotification(
+          totalTracks: items.length,
+          excludedDownloadedCount: skippedDownloads,
+          errorCount: state.scanErrorCount,
+        );
       } else {
         // Incremental scan path - only scans new/modified files
         final existingFiles = await _db.getFileModTimes();
@@ -292,6 +391,7 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
 
         if (_scanCancelRequested) {
           state = state.copyWith(isScanning: false, scanWasCancelled: true);
+          await _showScanCancelledNotification();
           return;
         }
 
@@ -328,7 +428,7 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
           for (final json in scannedList) {
             final map = json as Map<String, dynamic>;
             final filePath = map['filePath'] as String?;
-            if (filePath != null && downloadedPaths.contains(filePath)) {
+            if (_isDownloadedPath(filePath, downloadedPathKeys)) {
               skippedDownloads++;
               continue;
             }
@@ -383,10 +483,16 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
           '(${scannedList.length} new/updated, $skippedCount unchanged, '
           '${deletedPaths.length} removed, $skippedDownloads already in downloads)',
         );
+        await _showScanCompleteNotification(
+          totalTracks: items.length,
+          excludedDownloadedCount: skippedDownloads,
+          errorCount: state.scanErrorCount,
+        );
       }
     } catch (e, stack) {
       _log.e('Library scan failed: $e', e, stack);
       state = state.copyWith(isScanning: false, scanWasCancelled: false);
+      await _showScanFailedNotification(e.toString());
     } finally {
       _stopProgressPolling();
     }
@@ -395,16 +501,43 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
   void _startProgressPolling() {
     _progressTimer?.cancel();
     _progressTimer = Timer.periodic(_progressPollingInterval, (_) async {
+      if (_isProgressPollingInFlight) return;
+      _isProgressPollingInFlight = true;
       try {
         final progress = await PlatformBridge.getLibraryScanProgress();
-
-        state = state.copyWith(
-          scanProgress: (progress['progress_pct'] as num?)?.toDouble() ?? 0,
-          scanCurrentFile: progress['current_file'] as String?,
-          scanTotalFiles: progress['total_files'] as int? ?? 0,
-          scannedFiles: progress['scanned_files'] as int? ?? 0,
-          scanErrorCount: progress['error_count'] as int? ?? 0,
+        final nextProgress =
+            (progress['progress_pct'] as num?)?.toDouble() ?? 0;
+        final normalizedProgress = ((nextProgress * 10).round() / 10).clamp(
+          0.0,
+          100.0,
         );
+        final currentFile = progress['current_file'] as String?;
+        final totalFiles = progress['total_files'] as int? ?? 0;
+        final scannedFiles = progress['scanned_files'] as int? ?? 0;
+        final errorCount = progress['error_count'] as int? ?? 0;
+
+        final shouldUpdateState =
+            state.scanProgress != normalizedProgress ||
+            state.scanCurrentFile != currentFile ||
+            state.scanTotalFiles != totalFiles ||
+            state.scannedFiles != scannedFiles ||
+            state.scanErrorCount != errorCount;
+
+        if (shouldUpdateState) {
+          state = state.copyWith(
+            scanProgress: normalizedProgress,
+            scanCurrentFile: currentFile,
+            scanTotalFiles: totalFiles,
+            scannedFiles: scannedFiles,
+            scanErrorCount: errorCount,
+          );
+          await _showScanProgressNotification(
+            progress: normalizedProgress,
+            scannedFiles: scannedFiles,
+            totalFiles: totalFiles,
+            currentFile: currentFile,
+          );
+        }
 
         if (progress['is_complete'] == true) {
           _stopProgressPolling();
@@ -415,6 +548,8 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
         if (_progressPollingErrorCount <= 3) {
           _log.w('Library scan progress polling failed: $e');
         }
+      } finally {
+        _isProgressPollingInFlight = false;
       }
     });
   }
@@ -423,6 +558,7 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
     _progressTimer?.cancel();
     _progressTimer = null;
     _progressPollingErrorCount = 0;
+    _isProgressPollingInFlight = false;
   }
 
   Future<void> cancelScan() async {
@@ -433,6 +569,75 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
     await PlatformBridge.cancelLibraryScan();
     state = state.copyWith(isScanning: false, scanWasCancelled: true);
     _stopProgressPolling();
+    await _showScanCancelledNotification();
+  }
+
+  Future<void> _showScanProgressNotification({
+    required double progress,
+    required int scannedFiles,
+    required int totalFiles,
+    required String? currentFile,
+  }) async {
+    try {
+      await _notificationService.showLibraryScanProgress(
+        progress: progress,
+        scannedFiles: scannedFiles,
+        totalFiles: totalFiles,
+        currentFile: _shortenFileForNotification(currentFile),
+      );
+    } catch (e) {
+      _log.w('Failed to show scan progress notification: $e');
+    }
+  }
+
+  Future<void> _showScanCompleteNotification({
+    required int totalTracks,
+    required int excludedDownloadedCount,
+    required int errorCount,
+  }) async {
+    try {
+      await _notificationService.showLibraryScanComplete(
+        totalTracks: totalTracks,
+        excludedDownloadedCount: excludedDownloadedCount,
+        errorCount: errorCount,
+      );
+    } catch (e) {
+      _log.w('Failed to show scan complete notification: $e');
+    }
+  }
+
+  Future<void> _showScanFailedNotification(String message) async {
+    try {
+      await _notificationService.showLibraryScanFailed(message);
+    } catch (e) {
+      _log.w('Failed to show scan failure notification: $e');
+    }
+  }
+
+  Future<void> _showScanCancelledNotification() async {
+    try {
+      await _notificationService.showLibraryScanCancelled();
+    } catch (e) {
+      _log.w('Failed to show scan cancelled notification: $e');
+    }
+  }
+
+  String? _shortenFileForNotification(String? path) {
+    final raw = path?.trim() ?? '';
+    if (raw.isEmpty) return null;
+
+    var decoded = raw;
+    try {
+      decoded = Uri.decodeFull(raw);
+    } catch (_) {}
+
+    final slashIdx = decoded.lastIndexOf('/');
+    final backslashIdx = decoded.lastIndexOf('\\');
+    final cut = slashIdx > backslashIdx ? slashIdx : backslashIdx;
+    if (cut >= 0 && cut < decoded.length - 1) {
+      return decoded.substring(cut + 1);
+    }
+    return decoded;
   }
 
   Future<int> cleanupMissingFiles() async {
@@ -560,17 +765,34 @@ class LocalLibraryNotifier extends Notifier<LocalLibraryState> {
       }
     }
 
+    final paths = legacyPaths
+        .where((path) => !path.startsWith('content://'))
+        .toList(growable: false);
+    const chunkSize = 24;
     final backfilled = <String, int>{};
-    for (final path in legacyPaths) {
-      if (_scanCancelRequested || path.startsWith('content://')) {
-        continue;
+
+    for (var i = 0; i < paths.length; i += chunkSize) {
+      if (_scanCancelRequested) {
+        break;
       }
-      try {
-        final stat = await File(path).stat();
-        if (stat.type == FileSystemEntityType.file) {
-          backfilled[path] = stat.modified.millisecondsSinceEpoch;
+      final end = (i + chunkSize < paths.length) ? i + chunkSize : paths.length;
+      final chunk = paths.sublist(i, end);
+      final chunkEntries = await Future.wait<MapEntry<String, int>?>(
+        chunk.map((path) async {
+          try {
+            final stat = await File(path).stat();
+            if (stat.type == FileSystemEntityType.file) {
+              return MapEntry(path, stat.modified.millisecondsSinceEpoch);
+            }
+          } catch (_) {}
+          return null;
+        }),
+      );
+      for (final entry in chunkEntries) {
+        if (entry != null) {
+          backfilled[entry.key] = entry.value;
         }
-      } catch (_) {}
+      }
     }
     return backfilled;
   }

lib/providers/settings_provider.dart

@@ -39,6 +39,23 @@ class SettingsNotifier extends Notifier<AppSettings> {
     _applySpotifyCredentials();
 
     LogBuffer.loggingEnabled = state.enableLogging;
+
+    _syncLyricsSettingsToBackend();
+  }
+
+  void _syncLyricsSettingsToBackend() {
+    PlatformBridge.setLyricsProviders(state.lyricsProviders).catchError((e) {
+      _log.w('Failed to sync lyrics providers to backend: $e');
+    });
+
+    PlatformBridge.setLyricsFetchOptions({
+      'include_translation_netease': state.lyricsIncludeTranslationNetease,
+      'include_romanization_netease': state.lyricsIncludeRomanizationNetease,
+      'multi_person_word_by_word': state.lyricsMultiPersonWordByWord,
+      'musixmatch_language': state.musixmatchLanguage,
+    }).catchError((e) {
+      _log.w('Failed to sync lyrics fetch options to backend: $e');
+    });
   }
 
   Future<void> _runMigrations(SharedPreferences prefs) async {
@@ -188,6 +205,36 @@ class SettingsNotifier extends Notifier<AppSettings> {
     }
   }
 
+  void setLyricsProviders(List<String> providers) {
+    state = state.copyWith(lyricsProviders: providers);
+    _saveSettings();
+    _syncLyricsSettingsToBackend();
+  }
+
+  void setLyricsIncludeTranslationNetease(bool enabled) {
+    state = state.copyWith(lyricsIncludeTranslationNetease: enabled);
+    _saveSettings();
+    _syncLyricsSettingsToBackend();
+  }
+
+  void setLyricsIncludeRomanizationNetease(bool enabled) {
+    state = state.copyWith(lyricsIncludeRomanizationNetease: enabled);
+    _saveSettings();
+    _syncLyricsSettingsToBackend();
+  }
+
+  void setLyricsMultiPersonWordByWord(bool enabled) {
+    state = state.copyWith(lyricsMultiPersonWordByWord: enabled);
+    _saveSettings();
+    _syncLyricsSettingsToBackend();
+  }
+
+  void setMusixmatchLanguage(String languageCode) {
+    state = state.copyWith(musixmatchLanguage: languageCode.trim().toLowerCase());
+    _saveSettings();
+    _syncLyricsSettingsToBackend();
+  }
+
   void setMaxQualityCover(bool enabled) {
     state = state.copyWith(maxQualityCover: enabled);
     _saveSettings();
@@ -231,6 +278,16 @@ class SettingsNotifier extends Notifier<AppSettings> {
     _saveSettings();
   }
 
+  void setUsePrimaryArtistOnly(bool enabled) {
+    state = state.copyWith(usePrimaryArtistOnly: enabled);
+    _saveSettings();
+  }
+
+  void setFilterContributingArtistsInAlbumArtist(bool enabled) {
+    state = state.copyWith(filterContributingArtistsInAlbumArtist: enabled);
+    _saveSettings();
+  }
+
   void setHistoryViewMode(String mode) {
     state = state.copyWith(historyViewMode: mode);
     _saveSettings();

lib/providers/track_provider.dart

@@ -26,8 +26,10 @@ class TrackState {
   final List<SearchPlaylist>? searchPlaylists; // For search results (playlists)
   final bool hasSearchText; // For back button handling
   final bool isShowingRecentAccess; // For recent access mode
-  final String? searchExtensionId; // Extension ID used for current search results
-  final String? selectedSearchFilter; // Currently selected search filter (e.g., "track", "album", "artist", "playlist")
+  final String?
+  searchExtensionId; // Extension ID used for current search results
+  final String?
+  selectedSearchFilter; // Currently selected search filter (e.g., "track", "album", "artist", "playlist")
 
   const TrackState({
     this.tracks = const [],
@@ -52,7 +54,12 @@ class TrackState {
     this.selectedSearchFilter,
   });
 
-  bool get hasContent => tracks.isNotEmpty || artistAlbums != null || (searchArtists != null && searchArtists!.isNotEmpty) || (searchAlbums != null && searchAlbums!.isNotEmpty) || (searchPlaylists != null && searchPlaylists!.isNotEmpty);
+  bool get hasContent =>
+      tracks.isNotEmpty ||
+      artistAlbums != null ||
+      (searchArtists != null && searchArtists!.isNotEmpty) ||
+      (searchAlbums != null && searchAlbums!.isNotEmpty) ||
+      (searchPlaylists != null && searchPlaylists!.isNotEmpty);
 
   TrackState copyWith({
     List<Track>? tracks,
@@ -95,9 +102,12 @@ class TrackState {
       searchAlbums: searchAlbums ?? this.searchAlbums,
       searchPlaylists: searchPlaylists ?? this.searchPlaylists,
       hasSearchText: hasSearchText ?? this.hasSearchText,
-      isShowingRecentAccess: isShowingRecentAccess ?? this.isShowingRecentAccess,
+      isShowingRecentAccess:
+          isShowingRecentAccess ?? this.isShowingRecentAccess,
       searchExtensionId: searchExtensionId,
-      selectedSearchFilter: clearSelectedSearchFilter ? null : (selectedSearchFilter ?? this.selectedSearchFilter),
+      selectedSearchFilter: clearSelectedSearchFilter
+          ? null
+          : (selectedSearchFilter ?? this.selectedSearchFilter),
     );
   }
 }
@@ -178,6 +188,7 @@ class SearchPlaylist {
 
 class TrackNotifier extends Notifier<TrackState> {
   int _currentRequestId = 0;
+  static const int _maxPreWarmTracksPerRequest = 80;
 
   @override
   TrackState build() {
@@ -197,39 +208,42 @@ class TrackNotifier extends Notifier<TrackState> {
       final extensionHandler = await PlatformBridge.findURLHandler(url);
       if (extensionHandler != null) {
         _log.i('Found extension URL handler: $extensionHandler for URL: $url');
-        
+
         // Retry logic for extension URL handlers (up to 3 attempts)
         Map<String, dynamic>? result;
         for (int attempt = 1; attempt <= 3; attempt++) {
           result = await PlatformBridge.handleURLWithExtension(url);
           if (!_isRequestValid(requestId)) return;
-          
+
           // Check if we got valid data
-          if (result != null && result['type'] == 'track' && result['track'] != null) {
+          if (result != null &&
+              result['type'] == 'track' &&
+              result['track'] != null) {
             final trackData = result['track'] as Map<String, dynamic>;
             final name = trackData['name']?.toString() ?? '';
             if (name.isNotEmpty) {
               break;
             }
-          } else if (result != null && (result['type'] == 'album' || result['type'] == 'playlist')) {
+          } else if (result != null &&
+              (result['type'] == 'album' || result['type'] == 'playlist')) {
             break;
           } else if (result != null && result['type'] == 'artist') {
             break;
           }
-          
+
           if (attempt < 3) {
             await Future.delayed(const Duration(milliseconds: 500));
           }
         }
-        
+
         if (result != null) {
           final type = result['type'] as String?;
           final extensionId = result['extension_id'] as String?;
-          
+
           if (type == 'track' && result['track'] != null) {
             final trackData = result['track'] as Map<String, dynamic>;
             final track = _parseSearchTrack(trackData, source: extensionId);
-            
+
             if (track.name.isEmpty) {
               state = TrackState(
                 isLoading: false,
@@ -237,7 +251,7 @@ class TrackNotifier extends Notifier<TrackState> {
               );
               return;
             }
-            
+
             state = TrackState(
               tracks: [track],
               isLoading: false,
@@ -245,15 +259,27 @@ class TrackNotifier extends Notifier<TrackState> {
               searchExtensionId: extensionId,
             );
             return;
-          } else if ((type == 'album' || type == 'playlist') && result['tracks'] != null) {
+          } else if ((type == 'album' || type == 'playlist') &&
+              result['tracks'] != null) {
             final trackList = result['tracks'] as List<dynamic>;
-            final tracks = trackList.map((t) => _parseSearchTrack(t as Map<String, dynamic>, source: extensionId)).toList();
+            final tracks = trackList
+                .map(
+                  (t) => _parseSearchTrack(
+                    t as Map<String, dynamic>,
+                    source: extensionId,
+                  ),
+                )
+                .toList();
             state = TrackState(
               tracks: tracks,
               isLoading: false,
               albumId: result['album']?['id'] as String?,
-              albumName: result['name'] as String? ?? result['album']?['name'] as String?,
-              playlistName: type == 'playlist' ? result['name'] as String? : null,
+              albumName:
+                  result['name'] as String? ??
+                  result['album']?['name'] as String?,
+              playlistName: type == 'playlist'
+                  ? result['name'] as String?
+                  : null,
               coverUrl: result['cover_url'] as String?,
               searchExtensionId: extensionId,
             );
@@ -261,17 +287,29 @@ class TrackNotifier extends Notifier<TrackState> {
           } else if (type == 'artist' && result['artist'] != null) {
             final artistData = result['artist'] as Map<String, dynamic>;
             final albumsList = artistData['albums'] as List<dynamic>? ?? [];
-            final albums = albumsList.map((a) => _parseArtistAlbum(a as Map<String, dynamic>)).toList();
-            
-            final topTracksList = artistData['top_tracks'] as List<dynamic>? ?? [];
-            final topTracks = topTracksList.map((t) => _parseSearchTrack(t as Map<String, dynamic>, source: extensionId)).toList();
-            
+            final albums = albumsList
+                .map((a) => _parseArtistAlbum(a as Map<String, dynamic>))
+                .toList();
+
+            final topTracksList =
+                artistData['top_tracks'] as List<dynamic>? ?? [];
+            final topTracks = topTracksList
+                .map(
+                  (t) => _parseSearchTrack(
+                    t as Map<String, dynamic>,
+                    source: extensionId,
+                  ),
+                )
+                .toList();
+
             state = TrackState(
               tracks: [],
               isLoading: false,
               artistId: artistData['id'] as String?,
               artistName: artistData['name'] as String?,
-              coverUrl: artistData['image_url'] as String? ?? artistData['images'] as String?,
+              coverUrl:
+                  artistData['image_url'] as String? ??
+                  artistData['images'] as String?,
               headerImageUrl: artistData['header_image'] as String?,
               monthlyListeners: artistData['listeners'] as int?,
               artistAlbums: albums,
@@ -282,19 +320,19 @@ class TrackNotifier extends Notifier<TrackState> {
           }
         }
       }
-      
+
       // Step 2: Try Deezer URL parsing
       if (url.contains('deezer.com') || url.contains('deezer.page.link')) {
         _log.i('Detected Deezer URL, parsing...');
         final parsed = await PlatformBridge.parseDeezerUrl(url);
         if (!_isRequestValid(requestId)) return;
-        
+
         final type = parsed['type'] as String;
         final id = parsed['id'] as String;
-        
+
         final metadata = await PlatformBridge.getDeezerMetadata(type, id);
         if (!_isRequestValid(requestId)) return;
-        
+
         if (type == 'track') {
           final trackData = metadata['track'] as Map<String, dynamic>;
           final track = _parseTrack(trackData);
@@ -306,7 +344,9 @@ class TrackNotifier extends Notifier<TrackState> {
         } else if (type == 'album') {
           final albumInfo = metadata['album_info'] as Map<String, dynamic>;
           final trackList = metadata['track_list'] as List<dynamic>;
-          final tracks = trackList.map((t) => _parseTrack(t as Map<String, dynamic>)).toList();
+          final tracks = trackList
+              .map((t) => _parseTrack(t as Map<String, dynamic>))
+              .toList();
           state = TrackState(
             tracks: tracks,
             isLoading: false,
@@ -316,9 +356,12 @@ class TrackNotifier extends Notifier<TrackState> {
           );
           _preWarmCacheForTracks(tracks);
         } else if (type == 'playlist') {
-          final playlistInfo = metadata['playlist_info'] as Map<String, dynamic>;
+          final playlistInfo =
+              metadata['playlist_info'] as Map<String, dynamic>;
           final trackList = metadata['track_list'] as List<dynamic>;
-          final tracks = trackList.map((t) => _parseTrack(t as Map<String, dynamic>)).toList();
+          final tracks = trackList
+              .map((t) => _parseTrack(t as Map<String, dynamic>))
+              .toList();
           state = TrackState(
             tracks: tracks,
             isLoading: false,
@@ -329,7 +372,9 @@ class TrackNotifier extends Notifier<TrackState> {
         } else if (type == 'artist') {
           final artistInfo = metadata['artist_info'] as Map<String, dynamic>;
           final albumsList = metadata['albums'] as List<dynamic>;
-          final albums = albumsList.map((a) => _parseArtistAlbum(a as Map<String, dynamic>)).toList();
+          final albums = albumsList
+              .map((a) => _parseArtistAlbum(a as Map<String, dynamic>))
+              .toList();
           state = TrackState(
             tracks: [],
             isLoading: false,
@@ -341,33 +386,38 @@ class TrackNotifier extends Notifier<TrackState> {
         }
         return;
       }
-      
+
       // Step 3: Try Tidal URL parsing
       if (url.contains('tidal.com')) {
         _log.i('Detected Tidal URL, parsing...');
         final parsed = await PlatformBridge.parseTidalUrl(url);
         if (!_isRequestValid(requestId)) return;
-        
+
         final type = parsed['type'] as String;
         final id = parsed['id'] as String;
-        
+
         _log.i('Tidal URL parsed: type=$type, id=$id');
-        
+
         // For track URLs, convert to Spotify/Deezer and fetch metadata from there
         if (type == 'track') {
           try {
             _log.i('Converting Tidal track to Spotify/Deezer via SongLink...');
-            final conversion = await PlatformBridge.convertTidalToSpotifyDeezer(url);
+            final conversion = await PlatformBridge.convertTidalToSpotifyDeezer(
+              url,
+            );
             if (!_isRequestValid(requestId)) return;
-            
+
             final spotifyUrl = conversion['spotify_url'] as String?;
             final deezerUrl = conversion['deezer_url'] as String?;
-            
+
             if (spotifyUrl != null && spotifyUrl.isNotEmpty) {
               _log.i('Found Spotify URL: $spotifyUrl, fetching metadata...');
-              final metadata = await PlatformBridge.getSpotifyMetadataWithFallback(spotifyUrl);
+              final metadata =
+                  await PlatformBridge.getSpotifyMetadataWithFallback(
+                    spotifyUrl,
+                  );
               if (!_isRequestValid(requestId)) return;
-              
+
               final trackData = metadata['track'] as Map<String, dynamic>;
               final track = _parseTrack(trackData);
               state = TrackState(
@@ -378,10 +428,15 @@ class TrackNotifier extends Notifier<TrackState> {
               return;
             } else if (deezerUrl != null && deezerUrl.isNotEmpty) {
               _log.i('Found Deezer URL: $deezerUrl, fetching metadata...');
-              final deezerParsed = await PlatformBridge.parseDeezerUrl(deezerUrl);
-              final metadata = await PlatformBridge.getDeezerMetadata('track', deezerParsed['id'] as String);
+              final deezerParsed = await PlatformBridge.parseDeezerUrl(
+                deezerUrl,
+              );
+              final metadata = await PlatformBridge.getDeezerMetadata(
+                'track',
+                deezerParsed['id'] as String,
+              );
               if (!_isRequestValid(requestId)) return;
-              
+
               final trackData = metadata['track'] as Map<String, dynamic>;
               final track = _parseTrack(trackData);
               state = TrackState(
@@ -395,30 +450,31 @@ class TrackNotifier extends Notifier<TrackState> {
             _log.w('Failed to convert Tidal URL via SongLink: $e');
           }
         }
-        
+
         // For album/artist/playlist, not yet supported
         state = TrackState(
           isLoading: false,
-          error: 'Tidal $type links are not fully supported yet. Only track links work via SongLink conversion.',
+          error:
+              'Tidal $type links are not fully supported yet. Only track links work via SongLink conversion.',
           hasSearchText: state.hasSearchText,
         );
         return;
       }
-      
+
       // Step 4: Fall back to Spotify parsing
       final parsed = await PlatformBridge.parseSpotifyUrl(url);
       if (!_isRequestValid(requestId)) return;
-      
+
       final type = parsed['type'] as String;
 
       Map<String, dynamic> metadata;
-      
+
       try {
         metadata = await PlatformBridge.getSpotifyMetadataWithFallback(url);
       } catch (e) {
         rethrow;
       }
-      
+
       if (!_isRequestValid(requestId)) return;
 
       if (type == 'track') {
@@ -432,7 +488,9 @@ class TrackNotifier extends Notifier<TrackState> {
       } else if (type == 'album') {
         final albumInfo = metadata['album_info'] as Map<String, dynamic>;
         final trackList = metadata['track_list'] as List<dynamic>;
-        final tracks = trackList.map((t) => _parseTrack(t as Map<String, dynamic>)).toList();
+        final tracks = trackList
+            .map((t) => _parseTrack(t as Map<String, dynamic>))
+            .toList();
         state = TrackState(
           tracks: tracks,
           isLoading: false,
@@ -444,7 +502,9 @@ class TrackNotifier extends Notifier<TrackState> {
       } else if (type == 'playlist') {
         final playlistInfo = metadata['playlist_info'] as Map<String, dynamic>;
         final trackList = metadata['track_list'] as List<dynamic>;
-        final tracks = trackList.map((t) => _parseTrack(t as Map<String, dynamic>)).toList();
+        final tracks = trackList
+            .map((t) => _parseTrack(t as Map<String, dynamic>))
+            .toList();
         final owner = playlistInfo['owner'] as Map<String, dynamic>?;
         state = TrackState(
           tracks: tracks,
@@ -456,7 +516,9 @@ class TrackNotifier extends Notifier<TrackState> {
       } else if (type == 'artist') {
         final artistInfo = metadata['artist_info'] as Map<String, dynamic>;
         final albumsList = metadata['albums'] as List<dynamic>;
-        final albums = albumsList.map((a) => _parseArtistAlbum(a as Map<String, dynamic>)).toList();
+        final albums = albumsList
+            .map((a) => _parseArtistAlbum(a as Map<String, dynamic>))
+            .toList();
         state = TrackState(
           tracks: [],
           isLoading: false,
@@ -468,17 +530,29 @@ class TrackNotifier extends Notifier<TrackState> {
       }
     } catch (e) {
       if (!_isRequestValid(requestId)) return;
-      state = TrackState(isLoading: false, error: e.toString(), hasSearchText: state.hasSearchText);
+      state = TrackState(
+        isLoading: false,
+        error: e.toString(),
+        hasSearchText: state.hasSearchText,
+      );
     }
   }
 
-  Future<void> search(String query, {String? metadataSource, String? filterOverride}) async {
+  Future<void> search(
+    String query, {
+    String? metadataSource,
+    String? filterOverride,
+  }) async {
     final requestId = ++_currentRequestId;
-    
+
     // Preserve selected filter during loading
     final currentFilter = filterOverride ?? state.selectedSearchFilter;
 
-    state = TrackState(isLoading: true, hasSearchText: state.hasSearchText, selectedSearchFilter: currentFilter);
+    state = TrackState(
+      isLoading: true,
+      hasSearchText: state.hasSearchText,
+      selectedSearchFilter: currentFilter,
+    );
 
     try {
       final settings = ref.read(settingsProvider);
@@ -494,20 +568,23 @@ class TrackNotifier extends Notifier<TrackState> {
           searchProvider.isNotEmpty;
 
       final source = metadataSource ?? 'deezer';
-      
+
       _log.i(
         'Search started: source=$source, query="$query", useExtensions=$useExtensions, filter=$currentFilter',
       );
-      
+
       Map<String, dynamic> results;
       List<Track> extensionTracks = [];
-      
+
       if (useExtensions) {
         try {
           _log.d('Calling extension search API...');
-          final extResults = await PlatformBridge.searchTracksWithExtensions(query, limit: 20);
+          final extResults = await PlatformBridge.searchTracksWithExtensions(
+            query,
+            limit: 20,
+          );
           _log.i('Extensions returned ${extResults.length} tracks');
-          
+
           for (final t in extResults) {
             try {
               extensionTracks.add(_parseSearchTrack(t));
@@ -519,37 +596,52 @@ class TrackNotifier extends Notifier<TrackState> {
           _log.w('Extension search failed, falling back to built-in: $e');
         }
       }
-      
+
       if (source == 'deezer') {
         _log.d('Calling Deezer search API...');
-        results = await PlatformBridge.searchDeezerAll(query, trackLimit: 20, artistLimit: 2, filter: currentFilter);
-        _log.i('Deezer returned ${(results['tracks'] as List?)?.length ?? 0} tracks, ${(results['artists'] as List?)?.length ?? 0} artists, ${(results['albums'] as List?)?.length ?? 0} albums');
+        results = await PlatformBridge.searchDeezerAll(
+          query,
+          trackLimit: 20,
+          artistLimit: 2,
+          filter: currentFilter,
+        );
+        _log.i(
+          'Deezer returned ${(results['tracks'] as List?)?.length ?? 0} tracks, ${(results['artists'] as List?)?.length ?? 0} artists, ${(results['albums'] as List?)?.length ?? 0} albums',
+        );
       } else {
         _log.d('Calling Spotify search API...');
-        results = await PlatformBridge.searchSpotifyAll(query, trackLimit: 20, artistLimit: 2);
-        _log.i('Spotify returned ${(results['tracks'] as List?)?.length ?? 0} tracks, ${(results['artists'] as List?)?.length ?? 0} artists');
+        results = await PlatformBridge.searchSpotifyAll(
+          query,
+          trackLimit: 20,
+          artistLimit: 2,
+        );
+        _log.i(
+          'Spotify returned ${(results['tracks'] as List?)?.length ?? 0} tracks, ${(results['artists'] as List?)?.length ?? 0} artists',
+        );
       }
-      
+
       if (!_isRequestValid(requestId)) {
         _log.w('Search request cancelled (requestId=$requestId)');
         return;
       }
-      
+
       final trackList = results['tracks'] as List<dynamic>? ?? [];
       final artistList = results['artists'] as List<dynamic>? ?? [];
       final albumList = results['albums'] as List<dynamic>? ?? [];
-      
-      _log.d('Raw results: ${trackList.length} tracks, ${artistList.length} artists, ${albumList.length} albums');
-      
+
+      _log.d(
+        'Raw results: ${trackList.length} tracks, ${artistList.length} artists, ${albumList.length} albums',
+      );
+
       final tracks = <Track>[];
-      
+
       tracks.addAll(extensionTracks);
-      
+
       final existingIsrcs = extensionTracks
           .where((t) => t.isrc != null && t.isrc!.isNotEmpty)
           .map((t) => t.isrc!)
           .toSet();
-      
+
       for (int i = 0; i < trackList.length; i++) {
         final t = trackList[i];
         try {
@@ -566,7 +658,7 @@ class TrackNotifier extends Notifier<TrackState> {
           _log.e('Failed to parse track[$i]: $e', e);
         }
       }
-      
+
       final artists = <SearchArtist>[];
       for (int i = 0; i < artistList.length; i++) {
         final a = artistList[i];
@@ -580,7 +672,7 @@ class TrackNotifier extends Notifier<TrackState> {
           _log.e('Failed to parse artist[$i]: $e', e);
         }
       }
-      
+
       final albums = <SearchAlbum>[];
       for (int i = 0; i < albumList.length; i++) {
         final a = albumList[i];
@@ -594,7 +686,7 @@ class TrackNotifier extends Notifier<TrackState> {
           _log.e('Failed to parse album[$i]: $e', e);
         }
       }
-      
+
       final playlistList = results['playlists'] as List<dynamic>? ?? [];
       final playlists = <SearchPlaylist>[];
       for (int i = 0; i < playlistList.length; i++) {
@@ -609,9 +701,11 @@ class TrackNotifier extends Notifier<TrackState> {
           _log.e('Failed to parse playlist[$i]: $e', e);
         }
       }
-      
-      _log.i('Search complete: ${tracks.length} tracks (${extensionTracks.length} from extensions), ${artists.length} artists, ${albums.length} albums, ${playlists.length} playlists parsed successfully');
-      
+
+      _log.i(
+        'Search complete: ${tracks.length} tracks (${extensionTracks.length} from extensions), ${artists.length} artists, ${albums.length} albums, ${playlists.length} playlists parsed successfully',
+      );
+
       state = TrackState(
         tracks: tracks,
         searchArtists: artists,
@@ -624,31 +718,45 @@ class TrackNotifier extends Notifier<TrackState> {
     } catch (e, stackTrace) {
       if (!_isRequestValid(requestId)) return;
       _log.e('Search failed: $e', e, stackTrace);
-      state = TrackState(isLoading: false, error: e.toString(), hasSearchText: state.hasSearchText, selectedSearchFilter: currentFilter);
+      state = TrackState(
+        isLoading: false,
+        error: e.toString(),
+        hasSearchText: state.hasSearchText,
+        selectedSearchFilter: currentFilter,
+      );
     }
   }
 
-  Future<void> customSearch(String extensionId, String query, {Map<String, dynamic>? options}) async {
+  Future<void> customSearch(
+    String extensionId,
+    String query, {
+    Map<String, dynamic>? options,
+  }) async {
     final requestId = ++_currentRequestId;
 
     state = TrackState(
       isLoading: true,
       hasSearchText: state.hasSearchText,
-      selectedSearchFilter: state.selectedSearchFilter, // Preserve filter during loading
+      selectedSearchFilter:
+          state.selectedSearchFilter, // Preserve filter during loading
     );
 
     try {
       _log.i('Custom search started: extension=$extensionId, query="$query"');
-      
-      final results = await PlatformBridge.customSearchWithExtension(extensionId, query, options: options);
-      
+
+      final results = await PlatformBridge.customSearchWithExtension(
+        extensionId,
+        query,
+        options: options,
+      );
+
       if (!_isRequestValid(requestId)) {
         _log.w('Custom search request cancelled (requestId=$requestId)');
         return;
       }
-      
+
       _log.i('Custom search returned ${results.length} tracks');
-      
+
       final tracks = <Track>[];
       for (int i = 0; i < results.length; i++) {
         final t = results[i];
@@ -658,21 +766,28 @@ class TrackNotifier extends Notifier<TrackState> {
           _log.e('Failed to parse custom search track[$i]: $e', e);
         }
       }
-      
-      _log.i('Custom search complete: ${tracks.length} tracks parsed (source=$extensionId)');
-      
+
+      _log.i(
+        'Custom search complete: ${tracks.length} tracks parsed (source=$extensionId)',
+      );
+
       state = TrackState(
         tracks: tracks,
         searchArtists: [],
         isLoading: false,
         hasSearchText: state.hasSearchText,
         searchExtensionId: extensionId, // Store which extension was used
-        selectedSearchFilter: state.selectedSearchFilter, // Preserve selected filter
+        selectedSearchFilter:
+            state.selectedSearchFilter, // Preserve selected filter
       );
     } catch (e, stackTrace) {
       if (!_isRequestValid(requestId)) return;
       _log.e('Custom search failed: $e', e, stackTrace);
-      state = TrackState(isLoading: false, error: e.toString(), hasSearchText: state.hasSearchText);
+      state = TrackState(
+        isLoading: false,
+        error: e.toString(),
+        hasSearchText: state.hasSearchText,
+      );
     }
   }
 
@@ -683,7 +798,10 @@ class TrackNotifier extends Notifier<TrackState> {
     if (track.isrc == null || track.isrc!.isEmpty) return;
 
     try {
-      final availability = await PlatformBridge.checkAvailability(track.id, track.isrc!);
+      final availability = await PlatformBridge.checkAvailability(
+        track.id,
+        track.isrc!,
+      );
       final updatedTrack = Track(
         id: track.id,
         name: track.name,
@@ -736,11 +854,14 @@ class TrackNotifier extends Notifier<TrackState> {
     }
     state = state.copyWith(hasSearchText: hasText);
   }
-  
+
   void setShowingRecentAccess(bool showing) {
+    if (state.isShowingRecentAccess == showing) {
+      return;
+    }
     state = state.copyWith(isShowingRecentAccess: showing);
   }
-  
+
   /// Set tracks from a collection (album/playlist) opened from search results
   void setTracksFromCollection({
     required List<Track> tracks,
@@ -782,9 +903,9 @@ class TrackNotifier extends Notifier<TrackState> {
     } else if (durationValue is double) {
       durationMs = durationValue.toInt();
     }
-    
+
     final itemType = data['item_type']?.toString();
-    
+
     return Track(
       id: (data['spotify_id'] ?? data['id'] ?? '').toString(),
       name: (data['name'] ?? '').toString(),
@@ -797,7 +918,10 @@ class TrackNotifier extends Notifier<TrackState> {
       trackNumber: data['track_number'] as int?,
       discNumber: data['disc_number'] as int?,
       releaseDate: data['release_date']?.toString(),
-      source: source ?? data['source']?.toString() ?? data['provider_id']?.toString(),
+      source:
+          source ??
+          data['source']?.toString() ??
+          data['provider_id']?.toString(),
       albumType: data['album_type']?.toString(),
       itemType: itemType,
     );
@@ -849,16 +973,25 @@ class TrackNotifier extends Notifier<TrackState> {
   }
 
   void _preWarmCacheForTracks(List<Track> tracks) {
-    final tracksWithIsrc = tracks.where((t) => t.isrc != null && t.isrc!.isNotEmpty).toList();
-    if (tracksWithIsrc.isEmpty) return;
-
-    final cacheRequests = tracksWithIsrc.map((t) => {
-      'isrc': t.isrc!,
-      'track_name': t.name,
-      'artist_name': t.artistName,
-      'spotify_id': t.id, // Include Spotify ID for Amazon lookup
-      'service': 'tidal',
-    }).toList();
+    if (tracks.isEmpty) return;
+    final cacheRequests = <Map<String, String>>[];
+    for (final track in tracks) {
+      final isrc = track.isrc;
+      if (isrc == null || isrc.isEmpty) {
+        continue;
+      }
+      cacheRequests.add({
+        'isrc': isrc,
+        'track_name': track.name,
+        'artist_name': track.artistName,
+        'spotify_id': track.id, // Include Spotify ID for Amazon lookup
+        'service': 'tidal',
+      });
+      if (cacheRequests.length >= _maxPreWarmTracksPerRequest) {
+        break;
+      }
+    }
+    if (cacheRequests.isEmpty) return;
 
     PlatformBridge.preWarmTrackCache(cacheRequests).catchError((_) {});
   }

lib/screens/album_screen.dart

@@ -268,6 +268,13 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
               (constraints.maxHeight - kToolbarHeight) /
               (expandedHeight - kToolbarHeight);
           final showContent = collapseRatio > 0.3;
+          final dpr = MediaQuery.devicePixelRatioOf(
+            context,
+          ).clamp(1.0, 3.0).toDouble();
+          final backgroundMemCacheWidth = (constraints.maxWidth * dpr)
+              .round()
+              .clamp(720, 1440)
+              .toInt();
 
           return FlexibleSpaceBar(
             collapseMode: CollapseMode.none,
@@ -279,6 +286,7 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
                   CachedNetworkImage(
                     imageUrl: widget.coverUrl!,
                     fit: BoxFit.cover,
+                    memCacheWidth: backgroundMemCacheWidth,
                     cacheManager: CoverCacheManager.instance,
                     placeholder: (_, _) =>
                         Container(color: colorScheme.surface),

lib/screens/artist_screen.dart

@@ -490,6 +490,9 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
       0,
       (sum, a) => sum + a.totalTracks,
     );
+    final textScale = MediaQuery.textScalerOf(context).scale(1.0);
+    final compactLayout =
+        MediaQuery.sizeOf(context).width < 430 || textScale > 1.15;
 
     return Positioned(
       left: 0,
@@ -510,53 +513,145 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
           top: false,
           child: Padding(
             padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
-            child: Row(
-              children: [
-                IconButton(
-                  onPressed: _exitSelectionMode,
-                  icon: const Icon(Icons.close),
-                  tooltip: context.l10n.dialogCancel,
-                ),
-                const SizedBox(width: 8),
-                Expanded(
-                  child: Column(
-                    crossAxisAlignment: CrossAxisAlignment.start,
+            child: compactLayout
+                ? Column(
                     mainAxisSize: MainAxisSize.min,
+                    crossAxisAlignment: CrossAxisAlignment.start,
                     children: [
-                      Text(
-                        context.l10n.discographySelectedCount(selectedCount),
-                        style: Theme.of(context).textTheme.titleMedium
-                            ?.copyWith(fontWeight: FontWeight.w600),
+                      Row(
+                        children: [
+                          IconButton(
+                            onPressed: _exitSelectionMode,
+                            icon: const Icon(Icons.close),
+                            tooltip: context.l10n.dialogCancel,
+                          ),
+                          const SizedBox(width: 8),
+                          Expanded(
+                            child: Column(
+                              crossAxisAlignment: CrossAxisAlignment.start,
+                              mainAxisSize: MainAxisSize.min,
+                              children: [
+                                Text(
+                                  context.l10n.discographySelectedCount(
+                                    selectedCount,
+                                  ),
+                                  maxLines: 1,
+                                  overflow: TextOverflow.ellipsis,
+                                  style: Theme.of(context).textTheme.titleMedium
+                                      ?.copyWith(fontWeight: FontWeight.w600),
+                                ),
+                                if (selectedCount > 0)
+                                  Text(
+                                    context.l10n.tracksCount(totalTracks),
+                                    maxLines: 1,
+                                    overflow: TextOverflow.ellipsis,
+                                    style: Theme.of(context).textTheme.bodySmall
+                                        ?.copyWith(
+                                          color: colorScheme.onSurfaceVariant,
+                                        ),
+                                  ),
+                              ],
+                            ),
+                          ),
+                        ],
                       ),
-                      if (selectedCount > 0)
-                        Text(
-                          context.l10n.tracksCount(totalTracks),
-                          style: Theme.of(context).textTheme.bodySmall
-                              ?.copyWith(color: colorScheme.onSurfaceVariant),
+                      const SizedBox(height: 8),
+                      Row(
+                        children: [
+                          Expanded(
+                            child: OutlinedButton(
+                              onPressed: allSelected
+                                  ? _deselectAll
+                                  : () => _selectAll(allAlbums),
+                              child: FittedBox(
+                                fit: BoxFit.scaleDown,
+                                child: Text(
+                                  allSelected
+                                      ? context.l10n.actionDeselect
+                                      : context.l10n.actionSelectAll,
+                                ),
+                              ),
+                            ),
+                          ),
+                          const SizedBox(width: 8),
+                          Expanded(
+                            child: FilledButton(
+                              onPressed: selectedCount > 0
+                                  ? () => _downloadSelectedAlbums(
+                                      context,
+                                      selectedAlbums,
+                                    )
+                                  : null,
+                              child: FittedBox(
+                                fit: BoxFit.scaleDown,
+                                child: Text(
+                                  context.l10n.discographyDownloadSelected,
+                                ),
+                              ),
+                            ),
+                          ),
+                        ],
+                      ),
+                    ],
+                  )
+                : Row(
+                    children: [
+                      IconButton(
+                        onPressed: _exitSelectionMode,
+                        icon: const Icon(Icons.close),
+                        tooltip: context.l10n.dialogCancel,
+                      ),
+                      const SizedBox(width: 8),
+                      Expanded(
+                        child: Column(
+                          crossAxisAlignment: CrossAxisAlignment.start,
+                          mainAxisSize: MainAxisSize.min,
+                          children: [
+                            Text(
+                              context.l10n.discographySelectedCount(
+                                selectedCount,
+                              ),
+                              maxLines: 1,
+                              overflow: TextOverflow.ellipsis,
+                              style: Theme.of(context).textTheme.titleMedium
+                                  ?.copyWith(fontWeight: FontWeight.w600),
+                            ),
+                            if (selectedCount > 0)
+                              Text(
+                                context.l10n.tracksCount(totalTracks),
+                                maxLines: 1,
+                                overflow: TextOverflow.ellipsis,
+                                style: Theme.of(context).textTheme.bodySmall
+                                    ?.copyWith(
+                                      color: colorScheme.onSurfaceVariant,
+                                    ),
+                              ),
+                          ],
                         ),
+                      ),
+                      TextButton(
+                        onPressed: allSelected
+                            ? _deselectAll
+                            : () => _selectAll(allAlbums),
+                        child: Text(
+                          allSelected
+                              ? context.l10n.actionDeselect
+                              : context.l10n.actionSelectAll,
+                        ),
+                      ),
+                      const SizedBox(width: 8),
+                      FilledButton.icon(
+                        onPressed: selectedCount > 0
+                            ? () => _downloadSelectedAlbums(
+                                context,
+                                selectedAlbums,
+                              )
+                            : null,
+                        icon: const Icon(Icons.download, size: 18),
+                        label: Text(context.l10n.discographyDownloadSelected),
+                      ),
                     ],
                   ),
-                ),
-                TextButton(
-                  onPressed: allSelected
-                      ? _deselectAll
-                      : () => _selectAll(allAlbums),
-                  child: Text(
-                    allSelected
-                        ? context.l10n.actionDeselect
-                        : context.l10n.actionSelectAll,
-                  ),
-                ),
-                const SizedBox(width: 8),
-                FilledButton.icon(
-                  onPressed: selectedCount > 0
-                      ? () => _downloadSelectedAlbums(context, selectedAlbums)
-                      : null,
-                  icon: const Icon(Icons.download, size: 18),
-                  label: Text(context.l10n.discographyDownloadSelected),
-                ),
-              ],
-            ),
           ),
         ),
       ),
@@ -1427,15 +1522,31 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
   void _downloadTrack(Track track) {
     final settings = ref.read(settingsProvider);
     ref.read(settingsProvider.notifier).setHasSearchedBefore();
-    ref
-        .read(downloadQueueProvider.notifier)
-        .addToQueue(track, settings.defaultService);
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        content: Text(context.l10n.snackbarAddedToQueue(track.name)),
-        duration: const Duration(seconds: 2),
-      ),
-    );
+
+    void enqueue(String service, {String? quality}) {
+      ref
+          .read(downloadQueueProvider.notifier)
+          .addToQueue(track, service, qualityOverride: quality);
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(context.l10n.snackbarAddedToQueue(track.name)),
+          duration: const Duration(seconds: 2),
+        ),
+      );
+    }
+
+    if (settings.askQualityBeforeDownload) {
+      DownloadServicePicker.show(
+        context,
+        onSelect: (quality, service) {
+          if (!mounted) return;
+          enqueue(service, quality: quality);
+        },
+      );
+      return;
+    }
+
+    enqueue(settings.defaultService);
   }
 
   Widget _buildAlbumSection(
@@ -1468,7 +1579,12 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
               final album = albums[index];
               return KeyedSubtree(
                 key: ValueKey(album.id),
-                child: _buildAlbumCard(album, colorScheme, tileSize: tileSize, sectionHeight: sectionHeight),
+                child: _buildAlbumCard(
+                  album,
+                  colorScheme,
+                  tileSize: tileSize,
+                  sectionHeight: sectionHeight,
+                ),
               );
             },
           ),
@@ -1601,9 +1717,9 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
                   Flexible(
                     child: Text(
                       album.name,
-                      style: Theme.of(
-                        context,
-                      ).textTheme.bodyMedium?.copyWith(fontWeight: FontWeight.w500),
+                      style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                        fontWeight: FontWeight.w500,
+                      ),
                       maxLines: 2,
                       overflow: TextOverflow.ellipsis,
                     ),

lib/screens/downloaded_album_screen.dart

@@ -1,3 +1,4 @@
+import 'dart:io';
 import 'dart:ui';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
@@ -8,6 +9,7 @@ import 'package:spotiflac_android/l10n/l10n.dart';
 import 'package:spotiflac_android/utils/file_access.dart';
 import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/screens/track_metadata_screen.dart';
+import 'package:spotiflac_android/services/downloaded_embedded_cover_resolver.dart';
 
 /// Screen to display downloaded tracks from a specific album
 class DownloadedAlbumScreen extends ConsumerStatefulWidget {
@@ -32,6 +34,20 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
   final Set<String> _selectedIds = {};
   bool _showTitleInAppBar = false;
   final ScrollController _scrollController = ScrollController();
+  bool _embeddedCoverRefreshScheduled = false;
+  List<DownloadHistoryItem>? _albumTracksSourceCache;
+  List<DownloadHistoryItem>? _albumTracksCache;
+  List<DownloadHistoryItem>? _discGroupingSourceCache;
+  Map<int, List<DownloadHistoryItem>>? _discGroupingCache;
+  List<int>? _sortedDiscNumbersCache;
+  List<DownloadHistoryItem>? _commonQualitySourceCache;
+  String? _commonQualityCache;
+  List<DownloadHistoryItem>? _embeddedCoverSourceCache;
+  String? _embeddedCoverPathCache;
+  bool _embeddedCoverPathResolved = false;
+
+  String get _albumLookupKey =>
+      '${widget.albumName.toLowerCase()}|${widget.artistName.toLowerCase()}';
 
   @override
   void initState() {
@@ -46,6 +62,17 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
     super.dispose();
   }
 
+  @override
+  void didUpdateWidget(covariant DownloadedAlbumScreen oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.albumName != widget.albumName ||
+        oldWidget.artistName != widget.artistName) {
+      _albumTracksSourceCache = null;
+      _albumTracksCache = null;
+      _invalidateDerivedTrackCaches();
+    }
+  }
+
   void _onScroll() {
     final shouldShow = _scrollController.offset > 280;
     if (shouldShow != _showTitleInAppBar) {
@@ -57,41 +84,74 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
   List<DownloadHistoryItem> _getAlbumTracks(
     List<DownloadHistoryItem> allItems,
   ) {
-    return allItems.where((item) {
-      // Use albumArtist if available and not empty, otherwise artistName
-      final itemArtist =
-          (item.albumArtist != null && item.albumArtist!.isNotEmpty)
-          ? item.albumArtist!
-          : item.artistName;
-      // Use lowercase for case-insensitive matching
-      final itemKey =
-          '${item.albumName.toLowerCase()}|${itemArtist.toLowerCase()}';
-      final albumKey =
-          '${widget.albumName.toLowerCase()}|${widget.artistName.toLowerCase()}';
-      return itemKey == albumKey;
-    }).toList()..sort((a, b) {
-      // Sort by disc number first, then by track number
-      final aDisc = a.discNumber ?? 1;
-      final bDisc = b.discNumber ?? 1;
-      if (aDisc != bDisc) return aDisc.compareTo(bDisc);
-      final aNum = a.trackNumber ?? 999;
-      final bNum = b.trackNumber ?? 999;
-      if (aNum != bNum) return aNum.compareTo(bNum);
-      return a.trackName.compareTo(b.trackName);
-    });
+    final cached = _albumTracksCache;
+    if (cached != null && identical(allItems, _albumTracksSourceCache)) {
+      return cached;
+    }
+
+    final tracks =
+        allItems.where((item) {
+          // Use albumArtist if available and not empty, otherwise artistName
+          final itemArtist =
+              (item.albumArtist != null && item.albumArtist!.isNotEmpty)
+              ? item.albumArtist!
+              : item.artistName;
+          // Use lowercase for case-insensitive matching
+          final itemKey =
+              '${item.albumName.toLowerCase()}|${itemArtist.toLowerCase()}';
+          return itemKey == _albumLookupKey;
+        }).toList()..sort((a, b) {
+          // Sort by disc number first, then by track number
+          final aDisc = a.discNumber ?? 1;
+          final bDisc = b.discNumber ?? 1;
+          if (aDisc != bDisc) return aDisc.compareTo(bDisc);
+          final aNum = a.trackNumber ?? 999;
+          final bNum = b.trackNumber ?? 999;
+          if (aNum != bNum) return aNum.compareTo(bNum);
+          return a.trackName.compareTo(b.trackName);
+        });
+
+    _albumTracksSourceCache = allItems;
+    _albumTracksCache = tracks;
+    _invalidateDerivedTrackCaches();
+    return tracks;
   }
 
-  Map<int, List<DownloadHistoryItem>> _groupTracksByDisc(
+  void _invalidateDerivedTrackCaches() {
+    _discGroupingSourceCache = null;
+    _discGroupingCache = null;
+    _sortedDiscNumbersCache = null;
+    _commonQualitySourceCache = null;
+    _commonQualityCache = null;
+    _embeddedCoverSourceCache = null;
+    _embeddedCoverPathCache = null;
+    _embeddedCoverPathResolved = false;
+  }
+
+  Map<int, List<DownloadHistoryItem>> _getDiscGroups(
     List<DownloadHistoryItem> tracks,
   ) {
+    final cached = _discGroupingCache;
+    if (cached != null && identical(tracks, _discGroupingSourceCache)) {
+      return cached;
+    }
+
     final discMap = <int, List<DownloadHistoryItem>>{};
     for (final track in tracks) {
       final discNumber = track.discNumber ?? 1;
       discMap.putIfAbsent(discNumber, () => []).add(track);
     }
+    _discGroupingSourceCache = tracks;
+    _discGroupingCache = discMap;
+    _sortedDiscNumbersCache = discMap.keys.toList()..sort();
     return discMap;
   }
 
+  List<int> _getSortedDiscNumbers(List<DownloadHistoryItem> tracks) {
+    _getDiscGroups(tracks);
+    return _sortedDiscNumbersCache ?? const [];
+  }
+
   void _enterSelectionMode(String itemId) {
     HapticFeedback.mediumImpact();
     setState(() {
@@ -152,10 +212,11 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
     if (confirmed == true && mounted) {
       final historyNotifier = ref.read(downloadHistoryProvider.notifier);
       final idsToDelete = _selectedIds.toList();
+      final tracksById = {for (final track in currentTracks) track.id: track};
 
       int deletedCount = 0;
       for (final id in idsToDelete) {
-        final item = currentTracks.where((e) => e.id == id).firstOrNull;
+        final item = tracksById[id];
         if (item != null) {
           try {
             await deleteFile(item.filePath);
@@ -191,10 +252,28 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
     }
   }
 
-  void _navigateToMetadataScreen(DownloadHistoryItem item) {
+  void _onEmbeddedCoverChanged() {
+    if (!mounted || _embeddedCoverRefreshScheduled) return;
+    _embeddedCoverRefreshScheduled = true;
+    _embeddedCoverPathResolved = false;
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      _embeddedCoverRefreshScheduled = false;
+      if (mounted) {
+        setState(() {});
+      }
+    });
+  }
+
+  Future<void> _navigateToMetadataScreen(DownloadHistoryItem item) async {
+    final navigator = Navigator.of(context);
     _precacheCover(item.coverUrl);
-    Navigator.push(
-      context,
+    final beforeModTime =
+        await DownloadedEmbeddedCoverResolver.readFileModTimeMillis(
+          item.filePath,
+        );
+    if (!mounted) return;
+
+    final result = await navigator.push(
       PageRouteBuilder(
         transitionDuration: const Duration(milliseconds: 300),
         reverseTransitionDuration: const Duration(milliseconds: 250),
@@ -204,6 +283,12 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
             FadeTransition(opacity: animation, child: child),
       ),
     );
+    await DownloadedEmbeddedCoverResolver.scheduleRefreshForPath(
+      item.filePath,
+      beforeModTime: beforeModTime,
+      force: result == true,
+      onChanged: _onEmbeddedCoverChanged,
+    );
   }
 
   void _precacheCover(String? url) {
@@ -211,8 +296,19 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
     if (!url.startsWith('http://') && !url.startsWith('https://')) {
       return;
     }
+    final dpr = MediaQuery.devicePixelRatioOf(
+      context,
+    ).clamp(1.0, 3.0).toDouble();
+    final targetSize = (360 * dpr).round().clamp(512, 1024).toInt();
     precacheImage(
-      CachedNetworkImageProvider(url, cacheManager: CoverCacheManager.instance),
+      ResizeImage(
+        CachedNetworkImageProvider(
+          url,
+          cacheManager: CoverCacheManager.instance,
+        ),
+        width: targetSize,
+        height: targetSize,
+      ),
       context,
     );
   }
@@ -256,7 +352,7 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
             CustomScrollView(
               controller: _scrollController,
               slivers: [
-                _buildAppBar(context, colorScheme),
+                _buildAppBar(context, colorScheme, tracks),
                 _buildInfoCard(context, colorScheme, tracks),
                 _buildTrackListHeader(context, colorScheme, tracks),
                 _buildTrackList(context, colorScheme, tracks),
@@ -285,7 +381,32 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
     );
   }
 
-  Widget _buildAppBar(BuildContext context, ColorScheme colorScheme) {
+  String? _resolveAlbumEmbeddedCoverPath(List<DownloadHistoryItem> tracks) {
+    if (_embeddedCoverPathResolved &&
+        identical(tracks, _embeddedCoverSourceCache)) {
+      return _embeddedCoverPathCache;
+    }
+
+    _embeddedCoverSourceCache = tracks;
+    _embeddedCoverPathResolved = true;
+
+    if (tracks.isEmpty) {
+      _embeddedCoverPathCache = null;
+      return null;
+    }
+
+    _embeddedCoverPathCache = DownloadedEmbeddedCoverResolver.resolve(
+      tracks.first.filePath,
+      onChanged: _onEmbeddedCoverChanged,
+    );
+    return _embeddedCoverPathCache;
+  }
+
+  Widget _buildAppBar(
+    BuildContext context,
+    ColorScheme colorScheme,
+    List<DownloadHistoryItem> tracks,
+  ) {
     final mediaSize = MediaQuery.of(context).size;
     final screenWidth = mediaSize.width;
     final shortestSide = mediaSize.shortestSide;
@@ -294,6 +415,7 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
     final bottomGradientHeight = (shortestSide * 0.2).clamp(56.0, 80.0);
     final coverTopPadding = (shortestSide * 0.14).clamp(40.0, 60.0);
     final fallbackIconSize = (coverSize * 0.32).clamp(44.0, 64.0);
+    final embeddedCoverPath = _resolveAlbumEmbeddedCoverPath(tracks);
 
     return SliverAppBar(
       expandedHeight: expandedHeight,
@@ -322,6 +444,13 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
               (constraints.maxHeight - kToolbarHeight) /
               (expandedHeight - kToolbarHeight);
           final showContent = collapseRatio > 0.3;
+          final dpr = MediaQuery.devicePixelRatioOf(
+            context,
+          ).clamp(1.0, 3.0).toDouble();
+          final backgroundMemCacheWidth = (constraints.maxWidth * dpr)
+              .round()
+              .clamp(720, 1440)
+              .toInt();
 
           return FlexibleSpaceBar(
             collapseMode: CollapseMode.none,
@@ -329,10 +458,19 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
               fit: StackFit.expand,
               children: [
                 // Blurred cover background
-                if (widget.coverUrl != null)
+                if (embeddedCoverPath != null)
+                  Image.file(
+                    File(embeddedCoverPath),
+                    fit: BoxFit.cover,
+                    cacheWidth: backgroundMemCacheWidth,
+                    errorBuilder: (_, _, _) =>
+                        Container(color: colorScheme.surface),
+                  )
+                else if (widget.coverUrl != null)
                   CachedNetworkImage(
                     imageUrl: widget.coverUrl!,
                     fit: BoxFit.cover,
+                    memCacheWidth: backgroundMemCacheWidth,
                     cacheManager: CoverCacheManager.instance,
                     placeholder: (_, _) =>
                         Container(color: colorScheme.surface),
@@ -389,7 +527,22 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
                         ),
                         child: ClipRRect(
                           borderRadius: BorderRadius.circular(20),
-                          child: widget.coverUrl != null
+                          child: embeddedCoverPath != null
+                              ? Image.file(
+                                  File(embeddedCoverPath),
+                                  fit: BoxFit.cover,
+                                  cacheWidth: (coverSize * 2).toInt(),
+                                  cacheHeight: (coverSize * 2).toInt(),
+                                  errorBuilder: (_, _, _) => Container(
+                                    color: colorScheme.surfaceContainerHighest,
+                                    child: Icon(
+                                      Icons.album,
+                                      size: fallbackIconSize,
+                                      color: colorScheme.onSurfaceVariant,
+                                    ),
+                                  ),
+                                )
+                              : widget.coverUrl != null
                               ? CachedNetworkImage(
                                   imageUrl: widget.coverUrl!,
                                   fit: BoxFit.cover,
@@ -437,6 +590,8 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
     ColorScheme colorScheme,
     List<DownloadHistoryItem> tracks,
   ) {
+    final commonQuality = _getCommonQuality(tracks);
+
     return SliverToBoxAdapter(
       child: Padding(
         padding: const EdgeInsets.all(16),
@@ -500,22 +655,22 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
                       ),
                     ),
                     const SizedBox(width: 8),
-                    if (_getCommonQuality(tracks) != null)
+                    if (commonQuality != null)
                       Container(
                         padding: const EdgeInsets.symmetric(
                           horizontal: 12,
                           vertical: 6,
                         ),
                         decoration: BoxDecoration(
-                          color: _getCommonQuality(tracks)!.startsWith('24')
+                          color: commonQuality.startsWith('24')
                               ? colorScheme.tertiaryContainer
                               : colorScheme.surfaceContainerHighest,
                           borderRadius: BorderRadius.circular(20),
                         ),
                         child: Text(
-                          _getCommonQuality(tracks)!,
+                          commonQuality,
                           style: TextStyle(
-                            color: _getCommonQuality(tracks)!.startsWith('24')
+                            color: commonQuality.startsWith('24')
                                 ? colorScheme.onTertiaryContainer
                                 : colorScheme.onSurfaceVariant,
                             fontWeight: FontWeight.w600,
@@ -534,12 +689,30 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
   }
 
   String? _getCommonQuality(List<DownloadHistoryItem> tracks) {
-    if (tracks.isEmpty) return null;
-    final firstQuality = tracks.first.quality;
-    if (firstQuality == null) return null;
-    for (final track in tracks) {
-      if (track.quality != firstQuality) return null;
+    if (identical(tracks, _commonQualitySourceCache)) {
+      return _commonQualityCache;
     }
+
+    if (tracks.isEmpty) {
+      _commonQualitySourceCache = tracks;
+      _commonQualityCache = null;
+      return null;
+    }
+    final firstQuality = tracks.first.quality;
+    if (firstQuality == null) {
+      _commonQualitySourceCache = tracks;
+      _commonQualityCache = null;
+      return null;
+    }
+    for (final track in tracks) {
+      if (track.quality != firstQuality) {
+        _commonQualitySourceCache = tracks;
+        _commonQualityCache = null;
+        return null;
+      }
+    }
+    _commonQualitySourceCache = tracks;
+    _commonQualityCache = firstQuality;
     return firstQuality;
   }
 
@@ -585,7 +758,7 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
     ColorScheme colorScheme,
     List<DownloadHistoryItem> tracks,
   ) {
-    final discMap = _groupTracksByDisc(tracks);
+    final discMap = _getDiscGroups(tracks);
 
     if (discMap.length <= 1) {
       return SliverList(
@@ -599,7 +772,7 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
       );
     }
 
-    final discNumbers = discMap.keys.toList()..sort();
+    final discNumbers = _getSortedDiscNumbers(tracks);
     final List<Widget> children = [];
 
     for (final discNumber in discNumbers) {

lib/screens/home_tab.dart

@@ -18,6 +18,7 @@ import 'package:spotiflac_android/screens/track_metadata_screen.dart';
 import 'package:spotiflac_android/screens/album_screen.dart';
 import 'package:spotiflac_android/screens/artist_screen.dart';
 import 'package:spotiflac_android/services/csv_import_service.dart';
+import 'package:spotiflac_android/services/downloaded_embedded_cover_resolver.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
 import 'package:spotiflac_android/utils/app_bar_layout.dart';
 import 'package:spotiflac_android/utils/file_access.dart';
@@ -34,16 +35,25 @@ class HomeTab extends ConsumerStatefulWidget {
 
 class _RecentAccessView {
   final List<RecentAccessItem> uniqueItems;
-  final List<RecentAccessItem> downloadItems;
+  final List<String> downloadIds;
+  final Map<String, String> downloadFilePathByRecentKey;
   final bool hasHiddenDownloads;
 
   const _RecentAccessView({
     required this.uniqueItems,
-    required this.downloadItems,
+    required this.downloadIds,
+    required this.downloadFilePathByRecentKey,
     required this.hasHiddenDownloads,
   });
 }
 
+class _RecentAlbumAggregate {
+  int count;
+  DownloadHistoryItem mostRecent;
+
+  _RecentAlbumAggregate({required this.count, required this.mostRecent});
+}
+
 class _CsvImportOptions {
   final bool confirmed;
   final bool skipDownloaded;
@@ -57,7 +67,6 @@ class _CsvImportOptions {
 class _HomeTabState extends ConsumerState<HomeTab>
     with AutomaticKeepAliveClientMixin, SingleTickerProviderStateMixin {
   final _urlController = TextEditingController();
-  bool _isTyping = false;
   final FocusNode _searchFocusNode = FocusNode();
   String? _lastSearchQuery;
   late final ProviderSubscription<TrackState> _trackStateSub;
@@ -74,6 +83,9 @@ class _HomeTabState extends ConsumerState<HomeTab>
   List<RecentAccessItem>? _recentAccessItemsCache;
   Set<String>? _recentAccessHiddenIdsCache;
   _RecentAccessView? _recentAccessViewCache;
+  bool _embeddedCoverRefreshScheduled = false;
+  List<Extension>? _thumbnailSizesExtensionsCache;
+  Map<String, (double, double)>? _thumbnailSizesCache;
 
   double _responsiveScale({
     required BuildContext context,
@@ -197,6 +209,27 @@ class _HomeTabState extends ConsumerState<HomeTab>
     super.dispose();
   }
 
+  Map<String, (double, double)> _getThumbnailSizesByExtensionId(
+    List<Extension> extensions,
+  ) {
+    final cached = _thumbnailSizesCache;
+    if (cached != null &&
+        identical(extensions, _thumbnailSizesExtensionsCache)) {
+      return cached;
+    }
+
+    final map = <String, (double, double)>{
+      for (final extension in extensions)
+        if (extension.searchBehavior != null)
+          extension.id: extension.searchBehavior!.getThumbnailSize(
+            defaultSize: 56,
+          ),
+    };
+    _thumbnailSizesExtensionsCache = extensions;
+    _thumbnailSizesCache = map;
+    return map;
+  }
+
   void _onSearchFocusChanged() {
     if (mounted) {
       setState(() {});
@@ -214,7 +247,6 @@ class _HomeTabState extends ConsumerState<HomeTab>
         _urlController.text.isNotEmpty &&
         !_searchFocusNode.hasFocus) {
       _urlController.clear();
-      setState(() => _isTyping = false);
     }
   }
 
@@ -237,10 +269,7 @@ class _HomeTabState extends ConsumerState<HomeTab>
 
     ref.read(trackProvider.notifier).setSearchText(text.isNotEmpty);
 
-    if (text.isNotEmpty && !_isTyping) {
-      setState(() => _isTyping = true);
-    } else if (text.isEmpty && _isTyping) {
-      setState(() => _isTyping = false);
+    if (text.isEmpty) {
       _liveSearchDebounce?.cancel();
       return;
     }
@@ -347,7 +376,6 @@ class _HomeTabState extends ConsumerState<HomeTab>
     _urlController.clear();
     _searchFocusNode.unfocus();
     _lastSearchQuery = null;
-    setState(() => _isTyping = false);
     ref.read(trackProvider.notifier).clear();
   }
 
@@ -387,7 +415,6 @@ class _HomeTabState extends ConsumerState<HomeTab>
       );
       ref.read(trackProvider.notifier).clear();
       _urlController.clear();
-      setState(() => _isTyping = false);
       return;
     }
 
@@ -413,7 +440,6 @@ class _HomeTabState extends ConsumerState<HomeTab>
       );
       ref.read(trackProvider.notifier).clear();
       _urlController.clear();
-      setState(() => _isTyping = false);
       return;
     }
 
@@ -435,7 +461,6 @@ class _HomeTabState extends ConsumerState<HomeTab>
       );
       ref.read(trackProvider.notifier).clear();
       _urlController.clear();
-      setState(() => _isTyping = false);
       return;
     }
   }
@@ -778,13 +803,9 @@ class _HomeTabState extends ConsumerState<HomeTab>
     );
     final showLocalLibraryIndicator =
         localLibrarySettings.$1 && localLibrarySettings.$2;
-    final thumbnailSizesByExtensionId = <String, (double, double)>{
-      for (final extension in extensions)
-        if (extension.searchBehavior != null)
-          extension.id: extension.searchBehavior!.getThumbnailSize(
-            defaultSize: 56,
-          ),
-    };
+    final thumbnailSizesByExtensionId = _getThumbnailSizesByExtensionId(
+      extensions,
+    );
     Extension? currentSearchExtension;
     List<SearchFilter> searchFilters = [];
 
@@ -932,7 +953,9 @@ class _HomeTabState extends ConsumerState<HomeTab>
               ),
 
               // Search filter bar (only shown when has search results)
-              if (searchFilters.isNotEmpty && hasActualResults && !showRecentAccess)
+              if (searchFilters.isNotEmpty &&
+                  hasActualResults &&
+                  !showRecentAccess)
                 SliverToBoxAdapter(
                   child: _buildSearchFilterBar(
                     searchFilters,
@@ -1022,6 +1045,17 @@ class _HomeTabState extends ConsumerState<HomeTab>
     );
   }
 
+  void _onEmbeddedCoverChanged() {
+    if (!mounted || _embeddedCoverRefreshScheduled) return;
+    _embeddedCoverRefreshScheduled = true;
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      _embeddedCoverRefreshScheduled = false;
+      if (mounted) {
+        setState(() {});
+      }
+    });
+  }
+
   Widget _buildRecentDownloads(
     List<DownloadHistoryItem> items,
     ColorScheme colorScheme,
@@ -1049,6 +1083,10 @@ class _HomeTabState extends ConsumerState<HomeTab>
             itemCount: itemCount,
             itemBuilder: (context, index) {
               final item = items[index];
+              final embeddedCoverPath = DownloadedEmbeddedCoverResolver.resolve(
+                item.filePath,
+                onChanged: _onEmbeddedCoverChanged,
+              );
               return KeyedSubtree(
                 key: ValueKey(item.id),
                 child: GestureDetector(
@@ -1060,7 +1098,26 @@ class _HomeTabState extends ConsumerState<HomeTab>
                       children: [
                         ClipRRect(
                           borderRadius: BorderRadius.circular(12),
-                          child: item.coverUrl != null
+                          child: embeddedCoverPath != null
+                              ? Image.file(
+                                  File(embeddedCoverPath),
+                                  width: coverSize,
+                                  height: coverSize,
+                                  fit: BoxFit.cover,
+                                  cacheWidth: (coverSize * 2).round(),
+                                  cacheHeight: (coverSize * 2).round(),
+                                  errorBuilder: (_, _, _) => Container(
+                                    width: coverSize,
+                                    height: coverSize,
+                                    color: colorScheme.surfaceContainerHighest,
+                                    child: Icon(
+                                      Icons.music_note,
+                                      color: colorScheme.onSurfaceVariant,
+                                      size: 32,
+                                    ),
+                                  ),
+                                )
+                              : item.coverUrl != null
                               ? CachedNetworkImage(
                                   imageUrl: item.coverUrl!,
                                   width: coverSize,
@@ -1115,63 +1172,58 @@ class _HomeTabState extends ConsumerState<HomeTab>
       return cached;
     }
 
-    final albumGroups = <String, List<DownloadHistoryItem>>{};
+    final albumGroups = <String, _RecentAlbumAggregate>{};
     for (final h in historyItems) {
       final artistForKey = (h.albumArtist != null && h.albumArtist!.isNotEmpty)
           ? h.albumArtist!
           : h.artistName;
       final albumKey = '${h.albumName}|$artistForKey';
-      albumGroups.putIfAbsent(albumKey, () => []).add(h);
+      final existing = albumGroups[albumKey];
+      if (existing == null) {
+        albumGroups[albumKey] = _RecentAlbumAggregate(count: 1, mostRecent: h);
+      } else {
+        existing.count++;
+        if (h.downloadedAt.isAfter(existing.mostRecent.downloadedAt)) {
+          existing.mostRecent = h;
+        }
+      }
     }
 
-    final downloadItems = <RecentAccessItem>[];
-    for (final entry in albumGroups.entries) {
-      final tracks = entry.value;
-      final mostRecent = tracks.reduce(
-        (a, b) => a.downloadedAt.isAfter(b.downloadedAt) ? a : b,
-      );
+    final downloadIds = <String>[];
+    final visibleDownloads = <RecentAccessItem>[];
+    final downloadFilePathByRecentKey = <String, String>{};
+    for (final aggregate in albumGroups.values) {
+      final mostRecent = aggregate.mostRecent;
       final artistForKey =
           (mostRecent.albumArtist != null && mostRecent.albumArtist!.isNotEmpty)
           ? mostRecent.albumArtist!
           : mostRecent.artistName;
 
-      if (tracks.length == 1) {
-        downloadItems.add(
-          RecentAccessItem(
-            id: mostRecent.spotifyId ?? mostRecent.id,
-            name: mostRecent.trackName,
-            subtitle: mostRecent.artistName,
-            imageUrl: mostRecent.coverUrl,
-            type: RecentAccessType.track,
-            accessedAt: mostRecent.downloadedAt,
-            providerId: 'download',
-          ),
-        );
-      } else {
-        downloadItems.add(
-          RecentAccessItem(
-            id: '${mostRecent.albumName}|$artistForKey',
-            name: mostRecent.albumName,
-            subtitle: artistForKey,
-            imageUrl: mostRecent.coverUrl,
-            type: RecentAccessType.album,
-            accessedAt: mostRecent.downloadedAt,
-            providerId: 'download',
-          ),
-        );
+      final isSingleTrack = aggregate.count == 1;
+      final recentId = isSingleTrack
+          ? (mostRecent.spotifyId ?? mostRecent.id)
+          : '${mostRecent.albumName}|$artistForKey';
+      final recent = RecentAccessItem(
+        id: recentId,
+        name: isSingleTrack ? mostRecent.trackName : mostRecent.albumName,
+        subtitle: isSingleTrack ? mostRecent.artistName : artistForKey,
+        imageUrl: mostRecent.coverUrl,
+        type: isSingleTrack ? RecentAccessType.track : RecentAccessType.album,
+        accessedAt: mostRecent.downloadedAt,
+        providerId: 'download',
+      );
+
+      downloadIds.add(recentId);
+      downloadFilePathByRecentKey['${recent.type.name}:${recent.id}'] =
+          mostRecent.filePath;
+      if (!hiddenIds.contains(recentId)) {
+        visibleDownloads.add(recent);
       }
     }
 
-    downloadItems.sort((a, b) => b.accessedAt.compareTo(a.accessedAt));
-
-    final visibleDownloads = <RecentAccessItem>[];
-    for (final item in downloadItems) {
-      if (!hiddenIds.contains(item.id)) {
-        visibleDownloads.add(item);
-        if (visibleDownloads.length >= 10) {
-          break;
-        }
-      }
+    visibleDownloads.sort((a, b) => b.accessedAt.compareTo(a.accessedAt));
+    if (visibleDownloads.length > 10) {
+      visibleDownloads.removeRange(10, visibleDownloads.length);
     }
 
     final allItems = <RecentAccessItem>[...items, ...visibleDownloads];
@@ -1191,7 +1243,8 @@ class _HomeTabState extends ConsumerState<HomeTab>
 
     final view = _RecentAccessView(
       uniqueItems: uniqueItems,
-      downloadItems: downloadItems,
+      downloadIds: downloadIds,
+      downloadFilePathByRecentKey: downloadFilePathByRecentKey,
       hasHiddenDownloads: hiddenIds.isNotEmpty,
     );
 
@@ -1604,7 +1657,7 @@ class _HomeTabState extends ConsumerState<HomeTab>
 
   Widget _buildRecentAccess(_RecentAccessView view, ColorScheme colorScheme) {
     final uniqueItems = view.uniqueItems;
-    final downloadItems = view.downloadItems;
+    final downloadIds = view.downloadIds;
     final hasHiddenDownloads = view.hasHiddenDownloads;
 
     return Padding(
@@ -1624,10 +1677,10 @@ class _HomeTabState extends ConsumerState<HomeTab>
               if (uniqueItems.isNotEmpty)
                 TextButton(
                   onPressed: () {
-                    for (final item in downloadItems) {
+                    for (final id in downloadIds) {
                       ref
                           .read(recentAccessProvider.notifier)
-                          .hideDownloadFromRecents(item.id);
+                          .hideDownloadFromRecents(id);
                     }
                     ref.read(recentAccessProvider.notifier).clearHistory();
                   },
@@ -1680,7 +1733,11 @@ class _HomeTabState extends ConsumerState<HomeTab>
             )
           else
             ...uniqueItems.map(
-              (item) => _buildRecentAccessItem(item, colorScheme),
+              (item) => _buildRecentAccessItem(
+                item,
+                colorScheme,
+                view.downloadFilePathByRecentKey,
+              ),
             ),
         ],
       ),
@@ -1690,10 +1747,17 @@ class _HomeTabState extends ConsumerState<HomeTab>
   Widget _buildRecentAccessItem(
     RecentAccessItem item,
     ColorScheme colorScheme,
+    Map<String, String> downloadFilePathByRecentKey,
   ) {
     IconData typeIcon;
     String typeLabel;
     final isDownloaded = item.providerId == 'download';
+    final embeddedCoverPath = isDownloaded
+        ? DownloadedEmbeddedCoverResolver.resolve(
+            downloadFilePathByRecentKey['${item.type.name}:${item.id}'],
+            onChanged: _onEmbeddedCoverChanged,
+          )
+        : null;
 
     switch (item.type) {
       case RecentAccessType.artist:
@@ -1723,7 +1787,25 @@ class _HomeTabState extends ConsumerState<HomeTab>
                 borderRadius: BorderRadius.circular(
                   item.type == RecentAccessType.artist ? 28 : 4,
                 ),
-                child: item.imageUrl != null && item.imageUrl!.isNotEmpty
+                child: embeddedCoverPath != null
+                    ? Image.file(
+                        File(embeddedCoverPath),
+                        width: 56,
+                        height: 56,
+                        fit: BoxFit.cover,
+                        cacheWidth: 112,
+                        cacheHeight: 112,
+                        errorBuilder: (context, error, stackTrace) => Container(
+                          width: 56,
+                          height: 56,
+                          color: colorScheme.surfaceContainerHighest,
+                          child: Icon(
+                            typeIcon,
+                            color: colorScheme.onSurfaceVariant,
+                          ),
+                        ),
+                      )
+                    : item.imageUrl != null && item.imageUrl!.isNotEmpty
                     ? CachedNetworkImage(
                         imageUrl: item.imageUrl!,
                         width: 56,
@@ -1896,10 +1978,15 @@ class _HomeTabState extends ConsumerState<HomeTab>
     }
   }
 
-  void _navigateToMetadataScreen(DownloadHistoryItem item) {
+  Future<void> _navigateToMetadataScreen(DownloadHistoryItem item) async {
+    final navigator = Navigator.of(context);
     _precacheCover(item.coverUrl);
-    Navigator.push(
-      context,
+    final beforeModTime =
+        await DownloadedEmbeddedCoverResolver.readFileModTimeMillis(
+          item.filePath,
+        );
+    if (!mounted) return;
+    final result = await navigator.push(
       PageRouteBuilder(
         transitionDuration: const Duration(milliseconds: 300),
         reverseTransitionDuration: const Duration(milliseconds: 250),
@@ -1909,6 +1996,12 @@ class _HomeTabState extends ConsumerState<HomeTab>
             FadeTransition(opacity: animation, child: child),
       ),
     );
+    await DownloadedEmbeddedCoverResolver.scheduleRefreshForPath(
+      item.filePath,
+      beforeModTime: beforeModTime,
+      force: result == true,
+      onChanged: _onEmbeddedCoverChanged,
+    );
   }
 
   void _precacheCover(String? url) {
@@ -1916,8 +2009,19 @@ class _HomeTabState extends ConsumerState<HomeTab>
     if (!url.startsWith('http://') && !url.startsWith('https://')) {
       return;
     }
+    final dpr = MediaQuery.devicePixelRatioOf(
+      context,
+    ).clamp(1.0, 3.0).toDouble();
+    final targetSize = (360 * dpr).round().clamp(512, 1024).toInt();
     precacheImage(
-      CachedNetworkImageProvider(url, cacheManager: CoverCacheManager.instance),
+      ResizeImage(
+        CachedNetworkImageProvider(
+          url,
+          cacheManager: CoverCacheManager.instance,
+        ),
+        width: targetSize,
+        height: targetSize,
+      ),
       context,
     );
   }

lib/screens/local_album_screen.dart

@@ -36,6 +36,7 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
   late Map<int, List<LocalLibraryItem>> _discGroupsCache;
   late List<int> _sortedDiscNumbersCache;
   late bool _hasMultipleDiscsCache;
+  String? _commonQualityCache;
 
   @override
   void initState() {
@@ -87,6 +88,7 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
     _discGroupsCache = _groupTracksByDisc(_sortedTracksCache);
     _sortedDiscNumbersCache = _discGroupsCache.keys.toList()..sort();
     _hasMultipleDiscsCache = _discGroupsCache.length > 1;
+    _commonQualityCache = _computeCommonQuality(_sortedTracksCache);
   }
 
   Map<int, List<LocalLibraryItem>> _groupTracksByDisc(
@@ -160,15 +162,16 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
     if (confirmed == true && mounted) {
       final libraryNotifier = ref.read(localLibraryProvider.notifier);
       final idsToDelete = _selectedIds.toList();
+      final tracksById = {for (final track in currentTracks) track.id: track};
 
       int deletedCount = 0;
       for (final id in idsToDelete) {
-        final item = currentTracks.where((e) => e.id == id).firstOrNull;
+        final item = tracksById[id];
         if (item != null) {
           try {
             await deleteFile(item.filePath);
           } catch (_) {}
-          libraryNotifier.removeItem(id);
+          await libraryNotifier.removeItem(id);
           deletedCount++;
         }
       }
@@ -425,6 +428,8 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
     ColorScheme colorScheme,
     List<LocalLibraryItem> tracks,
   ) {
+    final commonQuality = _commonQualityCache;
+
     return SliverToBoxAdapter(
       child: Padding(
         padding: const EdgeInsets.all(16),
@@ -519,22 +524,22 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
                     ),
                     const SizedBox(width: 8),
                     // Quality badge if all tracks have the same quality
-                    if (_getCommonQuality(tracks) != null)
+                    if (commonQuality != null)
                       Container(
                         padding: const EdgeInsets.symmetric(
                           horizontal: 12,
                           vertical: 6,
                         ),
                         decoration: BoxDecoration(
-                          color: _getCommonQuality(tracks)!.contains('24')
+                          color: commonQuality.contains('24')
                               ? colorScheme.primaryContainer
                               : colorScheme.surfaceContainerHighest,
                           borderRadius: BorderRadius.circular(20),
                         ),
                         child: Text(
-                          _getCommonQuality(tracks)!,
+                          commonQuality,
                           style: TextStyle(
-                            color: _getCommonQuality(tracks)!.contains('24')
+                            color: commonQuality.contains('24')
                                 ? colorScheme.onPrimaryContainer
                                 : colorScheme.onSurfaceVariant,
                             fontWeight: FontWeight.w600,
@@ -552,10 +557,24 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
     );
   }
 
-  String? _getCommonQuality(List<LocalLibraryItem> tracks) {
+  String? _computeCommonQuality(List<LocalLibraryItem> tracks) {
     if (tracks.isEmpty) return null;
     final first = tracks.first;
-    if (first.bitDepth == null || first.sampleRate == null) return null;
+
+    // For lossy formats, use bitrate
+    if (first.bitrate != null && first.bitrate! > 0) {
+      final fmt = first.format?.toUpperCase() ?? '';
+      final firstBitrate = first.bitrate;
+      for (final track in tracks) {
+        if (track.bitrate != firstBitrate) {
+          return null;
+        }
+      }
+      return '$fmt ${firstBitrate}kbps'.trim();
+    }
+
+    // For lossless formats, use bit depth / sample rate
+    if (first.bitDepth == null || first.bitDepth == 0 || first.sampleRate == null) return null;
 
     final firstQuality =
         '${first.bitDepth}/${(first.sampleRate! / 1000).round()}kHz';

lib/screens/playlist_screen.dart

@@ -181,6 +181,13 @@ class _PlaylistScreenState extends ConsumerState<PlaylistScreen> {
               (constraints.maxHeight - kToolbarHeight) /
               (expandedHeight - kToolbarHeight);
           final showContent = collapseRatio > 0.3;
+          final dpr = MediaQuery.devicePixelRatioOf(
+            context,
+          ).clamp(1.0, 3.0).toDouble();
+          final backgroundMemCacheWidth = (constraints.maxWidth * dpr)
+              .round()
+              .clamp(720, 1440)
+              .toInt();
 
           return FlexibleSpaceBar(
             collapseMode: CollapseMode.none,
@@ -192,6 +199,7 @@ class _PlaylistScreenState extends ConsumerState<PlaylistScreen> {
                   CachedNetworkImage(
                     imageUrl: widget.coverUrl!,
                     fit: BoxFit.cover,
+                    memCacheWidth: backgroundMemCacheWidth,
                     cacheManager: CoverCacheManager.instance,
                     placeholder: (_, _) =>
                         Container(color: colorScheme.surface),

lib/screens/queue_tab.dart

@@ -14,6 +14,7 @@ import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
 import 'package:spotiflac_android/providers/local_library_provider.dart';
 import 'package:spotiflac_android/services/library_database.dart';
+import 'package:spotiflac_android/services/downloaded_embedded_cover_resolver.dart';
 import 'package:spotiflac_android/screens/track_metadata_screen.dart';
 import 'package:spotiflac_android/screens/downloaded_album_screen.dart';
 import 'package:spotiflac_android/screens/local_album_screen.dart';
@@ -69,7 +70,12 @@ class UnifiedLibraryItem {
 
   factory UnifiedLibraryItem.fromLocalLibrary(LocalLibraryItem item) {
     String? quality;
-    if (item.bitDepth != null && item.sampleRate != null) {
+    if (item.bitrate != null && item.bitrate! > 0) {
+      // Lossy format with bitrate
+      final fmt = item.format?.toUpperCase() ?? '';
+      quality = '$fmt ${item.bitrate}kbps'.trim();
+    } else if (item.bitDepth != null && item.bitDepth! > 0 && item.sampleRate != null) {
+      // Lossless format with actual bit depth
       quality =
           '${item.bitDepth}bit/${(item.sampleRate! / 1000).toStringAsFixed(1)}kHz';
     }
@@ -105,6 +111,7 @@ class _GroupedAlbum {
   final String albumName;
   final String artistName;
   final String? coverUrl;
+  final String sampleFilePath;
   final List<DownloadHistoryItem> tracks;
   final DateTime latestDownload;
   final String searchKey;
@@ -113,6 +120,7 @@ class _GroupedAlbum {
     required this.albumName,
     required this.artistName,
     this.coverUrl,
+    required this.sampleFilePath,
     required this.tracks,
     required this.latestDownload,
   }) : searchKey = '${albumName.toLowerCase()}|${artistName.toLowerCase()}';
@@ -207,10 +215,25 @@ class _UnifiedCacheEntry {
   });
 }
 
+class _QueueItemIdsSnapshot {
+  final List<String> ids;
+
+  const _QueueItemIdsSnapshot(this.ids);
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is _QueueItemIdsSnapshot && listEquals(ids, other.ids);
+
+  @override
+  int get hashCode => Object.hashAll(ids);
+}
+
 Map<String, List<String>> _filterHistoryInIsolate(Map<String, Object> payload) {
   final entries = (payload['entries'] as List).cast<List>();
   final albumCounts = (payload['albumCounts'] as Map).cast<String, int>();
   final query = (payload['query'] as String?) ?? '';
+  final hasQuery = query.isNotEmpty;
 
   final allIds = <String>[];
   final albumIds = <String>[];
@@ -219,10 +242,11 @@ Map<String, List<String>> _filterHistoryInIsolate(Map<String, Object> payload) {
   for (final entry in entries) {
     final id = entry[0] as String;
     final albumKey = entry[1] as String;
-    final searchKey = entry[2] as String;
-
-    if (query.isNotEmpty && !searchKey.contains(query)) {
-      continue;
+    if (hasQuery) {
+      final searchKey = entry[2] as String;
+      if (!searchKey.contains(query)) {
+        continue;
+      }
     }
 
     allIds.add(id);
@@ -259,6 +283,8 @@ class _QueueTabState extends ConsumerState<QueueTab> {
   final ValueNotifier<bool> _alwaysMissingFileNotifier = ValueNotifier(false);
   final Set<String> _pendingChecks = {};
   static const int _maxCacheSize = 500;
+  static const int _maxSearchIndexCacheSize = 4000;
+  bool _embeddedCoverRefreshScheduled = false;
 
   bool _isSelectionMode = false;
   final Set<String> _selectedIds = {};
@@ -290,8 +316,6 @@ class _QueueTabState extends ConsumerState<QueueTab> {
   _HistoryStats? _historyStatsCache;
   final Map<String, String> _searchIndexCache = {};
   final Map<String, String> _localSearchIndexCache = {};
-  Map<String, DownloadHistoryItem> _historyItemsById = {};
-  List<List<String>> _historyFilterEntries = const [];
   Map<String, List<DownloadHistoryItem>> _filteredHistoryCache = const {};
   List<DownloadHistoryItem>? _filterItemsCache;
   String _filterQueryCache = '';
@@ -379,32 +403,24 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     _historyItemsCache = items;
     _localLibraryItemsCache = localItems;
     _historyStatsCache = _buildHistoryStats(items, localItems);
-    _searchIndexCache
-      ..clear()
-      ..addEntries(
-        items.map((item) => MapEntry(item.id, _buildSearchKey(item))),
-      );
+    if (historyChanged) {
+      _searchIndexCache.clear();
+    }
     if (localChanged) {
-      _localSearchIndexCache
-        ..clear()
-        ..addEntries(
-          localItems.map(
-            (item) => MapEntry(item.id, _buildLocalSearchKey(item)),
-          ),
-        );
+      _localSearchIndexCache.clear();
       _localFilterItemsCache = null;
       _localFilterQueryCache = '';
       _filteredLocalItemsCache = const [];
     }
     _unifiedItemsCache.clear();
-    _historyItemsById = {for (final item in items) item.id: item};
-    _historyFilterEntries = List<List<String>>.generate(items.length, (index) {
-      final item = items[index];
-      final searchKey = _searchIndexCache[item.id] ?? _buildSearchKey(item);
-      final albumKey =
-          '${item.albumName.toLowerCase()}|${(item.albumArtist ?? item.artistName).toLowerCase()}';
-      return [item.id, albumKey, searchKey];
-    }, growable: false);
+
+    if (historyChanged) {
+      final validPaths = items
+          .map((item) => _cleanFilePath(item.filePath))
+          .where((path) => path.isNotEmpty)
+          .toSet();
+      DownloadedEmbeddedCoverResolver.invalidatePathsNotIn(validPaths);
+    }
     _requestFilterRefresh();
   }
 
@@ -418,6 +434,30 @@ class _QueueTabState extends ConsumerState<QueueTab> {
         .toLowerCase();
   }
 
+  String _historySearchKeyForItem(DownloadHistoryItem item) {
+    final cached = _searchIndexCache[item.id];
+    if (cached != null) return cached;
+
+    final searchKey = _buildSearchKey(item);
+    _searchIndexCache[item.id] = searchKey;
+    while (_searchIndexCache.length > _maxSearchIndexCacheSize) {
+      _searchIndexCache.remove(_searchIndexCache.keys.first);
+    }
+    return searchKey;
+  }
+
+  String _localSearchKeyForItem(LocalLibraryItem item) {
+    final cached = _localSearchIndexCache[item.id];
+    if (cached != null) return cached;
+
+    final searchKey = _buildLocalSearchKey(item);
+    _localSearchIndexCache[item.id] = searchKey;
+    while (_localSearchIndexCache.length > _maxSearchIndexCacheSize) {
+      _localSearchIndexCache.remove(_localSearchIndexCache.keys.first);
+    }
+    return searchKey;
+  }
+
   List<LocalLibraryItem> _filterLocalItems(
     List<LocalLibraryItem> items,
     String query,
@@ -430,11 +470,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
 
     final filtered = items
         .where((item) {
-          final searchKey =
-              _localSearchIndexCache[item.id] ?? _buildLocalSearchKey(item);
-          if (!_localSearchIndexCache.containsKey(item.id)) {
-            _localSearchIndexCache[item.id] = searchKey;
-          }
+          final searchKey = _localSearchKeyForItem(item);
           return searchKey.contains(query);
         })
         .toList(growable: false);
@@ -507,15 +543,26 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     }
 
     final requestId = ++_filterRequestId;
+    final includeSearchKey = query.isNotEmpty;
+    final entries = List<List<String>>.generate(items.length, (index) {
+      final item = items[index];
+      final albumKey =
+          '${item.albumName.toLowerCase()}|${(item.albumArtist ?? item.artistName).toLowerCase()}';
+      if (!includeSearchKey) {
+        return [item.id, albumKey];
+      }
+      final searchKey = _historySearchKeyForItem(item);
+      return [item.id, albumKey, searchKey];
+    }, growable: false);
     final payload = <String, Object>{
-      'entries': _historyFilterEntries,
+      'entries': entries,
       'albumCounts': albumCounts,
       'query': query,
     };
 
     compute(_filterHistoryInIsolate, payload).then((result) {
       if (!mounted || requestId != _filterRequestId) return;
-      final itemsById = _historyItemsById;
+      final itemsById = {for (final item in items) item.id: item};
       final filtered = <String, List<DownloadHistoryItem>>{};
       for (final entry in result.entries) {
         filtered[entry.key] = entry.value
@@ -563,10 +610,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     final query = searchQuery;
     return items
         .where((item) {
-          final searchKey = _searchIndexCache[item.id] ?? _buildSearchKey(item);
-          if (!_searchIndexCache.containsKey(item.id)) {
-            _searchIndexCache[item.id] = searchKey;
-          }
+          final searchKey = _historySearchKeyForItem(item);
           return searchKey.contains(query);
         })
         .toList(growable: false);
@@ -646,13 +690,26 @@ class _QueueTabState extends ConsumerState<QueueTab> {
   }
 
   String _getQualityBadgeText(String quality) {
-    if (quality.contains('bit')) {
+    final q = quality.trim().toLowerCase();
+    if (q.contains('bit')) {
       return quality.split('/').first;
     }
-    final bitrateMatch = RegExp(r'(\d+)kbps').firstMatch(quality);
-    if (bitrateMatch != null) {
-      return '${bitrateMatch.group(1)}k';
+
+    // Supports "MP3 320k", "Opus 256kbps", etc.
+    final bitrateTextMatch = RegExp(
+      r'(\d+)\s*k(?:bps)?',
+      caseSensitive: false,
+    ).firstMatch(quality);
+    if (bitrateTextMatch != null) {
+      return '${bitrateTextMatch.group(1)}k';
     }
+
+    // Supports legacy quality IDs like "opus_256" / "mp3_320".
+    final bitrateIdMatch = RegExp(r'_(\d+)$').firstMatch(q);
+    if (bitrateIdMatch != null) {
+      return '${bitrateIdMatch.group(1)}k';
+    }
+
     return quality.split(' ').first;
   }
 
@@ -682,10 +739,11 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     if (confirmed == true && mounted) {
       final historyNotifier = ref.read(downloadHistoryProvider.notifier);
       final localLibraryDb = LibraryDatabase.instance;
+      final itemsById = {for (final item in allItems) item.id: item};
 
       int deletedCount = 0;
       for (final id in _selectedIds) {
-        final item = allItems.where((e) => e.id == id).firstOrNull;
+        final item = itemsById[id];
         if (item != null) {
           try {
             final cleanPath = _cleanFilePath(item.filePath);
@@ -725,11 +783,42 @@ class _QueueTabState extends ConsumerState<QueueTab> {
 
   /// Strip EXISTS: prefix from file path (legacy history items)
   String _cleanFilePath(String? filePath) {
-    if (filePath == null) return '';
-    if (filePath.startsWith('EXISTS:')) {
-      return filePath.substring(7);
-    }
-    return filePath;
+    return DownloadedEmbeddedCoverResolver.cleanFilePath(filePath);
+  }
+
+  Future<int?> _readFileModTimeMillis(String? filePath) async {
+    return DownloadedEmbeddedCoverResolver.readFileModTimeMillis(filePath);
+  }
+
+  void _onEmbeddedCoverChanged() {
+    if (!mounted || _embeddedCoverRefreshScheduled) return;
+    _embeddedCoverRefreshScheduled = true;
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      _embeddedCoverRefreshScheduled = false;
+      if (mounted) {
+        setState(() {});
+      }
+    });
+  }
+
+  Future<void> _scheduleDownloadedEmbeddedCoverRefreshForPath(
+    String? filePath, {
+    int? beforeModTime,
+    bool force = false,
+  }) async {
+    await DownloadedEmbeddedCoverResolver.scheduleRefreshForPath(
+      filePath,
+      beforeModTime: beforeModTime,
+      force: force,
+      onChanged: _onEmbeddedCoverChanged,
+    );
+  }
+
+  String? _resolveDownloadedEmbeddedCoverPath(String? filePath) {
+    return DownloadedEmbeddedCoverResolver.resolve(
+      filePath,
+      onChanged: _onEmbeddedCoverChanged,
+    );
   }
 
   ValueListenable<bool> _fileExistsListenable(String? filePath) {
@@ -804,6 +893,24 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     });
   }
 
+  String _fileExtLower(String filePath) {
+    final dotIndex = filePath.lastIndexOf('.');
+    if (dotIndex < 0 || dotIndex == filePath.length - 1) {
+      return '';
+    }
+    return filePath.substring(dotIndex + 1).toLowerCase();
+  }
+
+  String? _localQualityLabel(LocalLibraryItem item) {
+    if (item.bitrate != null && item.bitrate! > 0) {
+      return '${item.bitrate}kbps';
+    }
+    if (item.bitDepth == null || item.bitDepth == 0 || item.sampleRate == null) {
+      return null;
+    }
+    return '${item.bitDepth}bit/${(item.sampleRate! / 1000).toStringAsFixed(1)}kHz';
+  }
+
   List<UnifiedLibraryItem> _applyAdvancedFilters(
     List<UnifiedLibraryItem> items,
   ) {
@@ -841,7 +948,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
             }
 
             if (_filterFormat != null) {
-              final ext = item.filePath.split('.').last.toLowerCase();
+              final ext = _fileExtLower(item.filePath);
               if (ext != _filterFormat) return false;
             }
 
@@ -897,7 +1004,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
   /// Check if a file path passes the current format filter
   bool _passesFormatFilter(String filePath) {
     if (_filterFormat == null) return true;
-    return filePath.split('.').last.toLowerCase() == _filterFormat;
+    return _fileExtLower(filePath) == _filterFormat;
   }
 
   /// Filter grouped download albums by search query + advanced filters
@@ -922,15 +1029,15 @@ class _QueueTabState extends ConsumerState<QueueTab> {
 
       // Filter tracks within the album by advanced filters
       if (_filterQuality != null || _filterFormat != null) {
-        final filteredTracks = album.tracks
-            .where((track) {
-              if (!_passesQualityFilter(track.quality)) return false;
-              if (!_passesFormatFilter(track.filePath)) return false;
-              return true;
-            })
-            .toList(growable: false);
+        var hasMatchingTrack = false;
+        for (final track in album.tracks) {
+          if (!_passesQualityFilter(track.quality)) continue;
+          if (!_passesFormatFilter(track.filePath)) continue;
+          hasMatchingTrack = true;
+          break;
+        }
 
-        if (filteredTracks.isEmpty) continue;
+        if (!hasMatchingTrack) continue;
       }
 
       result.add(album);
@@ -979,20 +1086,15 @@ class _QueueTabState extends ConsumerState<QueueTab> {
 
       // Filter tracks within the album by advanced filters
       if (_filterQuality != null || _filterFormat != null) {
-        final filteredTracks = album.tracks
-            .where((track) {
-              String? quality;
-              if (track.bitDepth != null && track.sampleRate != null) {
-                quality =
-                    '${track.bitDepth}bit/${(track.sampleRate! / 1000).toStringAsFixed(1)}kHz';
-              }
-              if (!_passesQualityFilter(quality)) return false;
-              if (!_passesFormatFilter(track.filePath)) return false;
-              return true;
-            })
-            .toList(growable: false);
+        var hasMatchingTrack = false;
+        for (final track in album.tracks) {
+          if (!_passesQualityFilter(_localQualityLabel(track))) continue;
+          if (!_passesFormatFilter(track.filePath)) continue;
+          hasMatchingTrack = true;
+          break;
+        }
 
-        if (filteredTracks.isEmpty) continue;
+        if (!hasMatchingTrack) continue;
       }
 
       result.add(album);
@@ -1022,7 +1124,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
   Set<String> _getAvailableFormats(List<UnifiedLibraryItem> items) {
     final formats = <String>{};
     for (final item in items) {
-      final ext = item.filePath.split('.').last.toLowerCase();
+      final ext = _fileExtLower(item.filePath);
       if (['flac', 'mp3', 'm4a', 'opus', 'ogg', 'wav', 'aiff'].contains(ext)) {
         formats.add(ext);
       }
@@ -1274,13 +1376,24 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     if (!url.startsWith('http://') && !url.startsWith('https://')) {
       return;
     }
+    final dpr = MediaQuery.devicePixelRatioOf(
+      context,
+    ).clamp(1.0, 3.0).toDouble();
+    final targetSize = (360 * dpr).round().clamp(512, 1024).toInt();
     precacheImage(
-      CachedNetworkImageProvider(url, cacheManager: CoverCacheManager.instance),
+      ResizeImage(
+        CachedNetworkImageProvider(
+          url,
+          cacheManager: CoverCacheManager.instance,
+        ),
+        width: targetSize,
+        height: targetSize,
+      ),
       context,
     );
   }
 
-  void _navigateToMetadataScreen(DownloadItem item) {
+  Future<void> _navigateToMetadataScreen(DownloadItem item) async {
     final historyItem = ref
         .read(downloadHistoryProvider)
         .items
@@ -1298,10 +1411,12 @@ class _QueueTabState extends ConsumerState<QueueTab> {
           ),
         );
 
+    final navigator = Navigator.of(context);
     _precacheCover(historyItem.coverUrl);
     _searchFocusNode.unfocus();
-    Navigator.push(
-      context,
+    final beforeModTime = await _readFileModTimeMillis(historyItem.filePath);
+    if (!mounted) return;
+    final result = await navigator.push(
       PageRouteBuilder(
         transitionDuration: const Duration(milliseconds: 300),
         reverseTransitionDuration: const Duration(milliseconds: 250),
@@ -1310,14 +1425,31 @@ class _QueueTabState extends ConsumerState<QueueTab> {
         transitionsBuilder: (context, animation, secondaryAnimation, child) =>
             FadeTransition(opacity: animation, child: child),
       ),
-    ).then((_) => _searchFocusNode.unfocus());
+    );
+    _searchFocusNode.unfocus();
+    if (result == true) {
+      await _scheduleDownloadedEmbeddedCoverRefreshForPath(
+        historyItem.filePath,
+        beforeModTime: beforeModTime,
+        force: true,
+      );
+      return;
+    }
+    await _scheduleDownloadedEmbeddedCoverRefreshForPath(
+      historyItem.filePath,
+      beforeModTime: beforeModTime,
+    );
   }
 
-  void _navigateToHistoryMetadataScreen(DownloadHistoryItem item) {
+  Future<void> _navigateToHistoryMetadataScreen(
+    DownloadHistoryItem item,
+  ) async {
+    final navigator = Navigator.of(context);
     _precacheCover(item.coverUrl);
     _searchFocusNode.unfocus();
-    Navigator.push(
-      context,
+    final beforeModTime = await _readFileModTimeMillis(item.filePath);
+    if (!mounted) return;
+    final result = await navigator.push(
       PageRouteBuilder(
         transitionDuration: const Duration(milliseconds: 300),
         reverseTransitionDuration: const Duration(milliseconds: 250),
@@ -1326,7 +1458,20 @@ class _QueueTabState extends ConsumerState<QueueTab> {
         transitionsBuilder: (context, animation, secondaryAnimation, child) =>
             FadeTransition(opacity: animation, child: child),
       ),
-    ).then((_) => _searchFocusNode.unfocus());
+    );
+    _searchFocusNode.unfocus();
+    if (result == true) {
+      await _scheduleDownloadedEmbeddedCoverRefreshForPath(
+        item.filePath,
+        beforeModTime: beforeModTime,
+        force: true,
+      );
+      return;
+    }
+    await _scheduleDownloadedEmbeddedCoverRefreshForPath(
+      item.filePath,
+      beforeModTime: beforeModTime,
+    );
   }
 
   void _navigateToLocalMetadataScreen(LocalLibraryItem item) {
@@ -1355,10 +1500,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     if (searchQuery.isNotEmpty) {
       final query = searchQuery;
       filteredItems = items.where((item) {
-        final searchKey = _searchIndexCache[item.id] ?? _buildSearchKey(item);
-        if (!_searchIndexCache.containsKey(item.id)) {
-          _searchIndexCache[item.id] = searchKey;
-        }
+        final searchKey = _historySearchKeyForItem(item);
         return searchKey.contains(query);
       }).toList();
     }
@@ -1421,6 +1563,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
           albumName: tracks.first.albumName,
           artistName: tracks.first.albumArtist ?? tracks.first.artistName,
           coverUrl: tracks.first.coverUrl,
+          sampleFilePath: tracks.first.filePath,
           tracks: tracks,
           latestDownload: tracks
               .map((t) => t.downloadedAt)
@@ -1544,7 +1687,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     _initializePageController();
 
     final hasQueueItems = ref.watch(
-      downloadQueueProvider.select((s) => s.items.isNotEmpty),
+      downloadQueueLookupProvider.select((lookup) => lookup.itemIds.isNotEmpty),
     );
     final allHistoryItems = ref.watch(
       downloadHistoryProvider.select((s) => s.items),
@@ -1572,6 +1715,14 @@ class _QueueTabState extends ConsumerState<QueueTab> {
         _buildHistoryStats(allHistoryItems, localLibraryItems);
     final groupedAlbums = historyStats.groupedAlbums;
     final groupedLocalAlbums = historyStats.groupedLocalAlbums;
+    final filteredGroupedAlbums = _filterGroupedAlbums(
+      groupedAlbums,
+      _searchQuery,
+    );
+    final filteredGroupedLocalAlbums = _filterGroupedLocalAlbums(
+      groupedLocalAlbums,
+      _searchQuery,
+    );
     final albumCount = historyStats.totalAlbumCount;
     final singleCount = historyStats.totalSingleTracks;
     final filterDataCache = <String, _FilterContentData>{};
@@ -1582,8 +1733,8 @@ class _QueueTabState extends ConsumerState<QueueTab> {
         () => _computeFilterContentData(
           filterMode: filterMode,
           allHistoryItems: allHistoryItems,
-          groupedAlbums: groupedAlbums,
-          groupedLocalAlbums: groupedLocalAlbums,
+          filteredGroupedAlbums: filteredGroupedAlbums,
+          filteredGroupedLocalAlbums: filteredGroupedLocalAlbums,
           albumCounts: historyStats.albumCounts,
           localAlbumCounts: historyStats.localAlbumCounts,
           localLibraryItems: localLibraryItems,
@@ -1647,7 +1798,9 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                 ),
 
                 // Search bar - always at top
-                if (allHistoryItems.isNotEmpty || hasQueueItems || localLibraryItems.isNotEmpty)
+                if (allHistoryItems.isNotEmpty ||
+                    hasQueueItems ||
+                    localLibraryItems.isNotEmpty)
                   SliverToBoxAdapter(
                     child: Padding(
                       padding: const EdgeInsets.fromLTRB(16, 8, 16, 0),
@@ -1972,8 +2125,8 @@ class _QueueTabState extends ConsumerState<QueueTab> {
   _FilterContentData _computeFilterContentData({
     required String filterMode,
     required List<DownloadHistoryItem> allHistoryItems,
-    required List<_GroupedAlbum> groupedAlbums,
-    required List<_GroupedLocalAlbum> groupedLocalAlbums,
+    required List<_GroupedAlbum> filteredGroupedAlbums,
+    required List<_GroupedLocalAlbum> filteredGroupedLocalAlbums,
     required Map<String, int> albumCounts,
     required Map<String, int> localAlbumCounts,
     required List<LocalLibraryItem> localLibraryItems,
@@ -1988,16 +2141,6 @@ class _QueueTabState extends ConsumerState<QueueTab> {
       filterMode: filterMode,
     );
 
-    final searchQuery = _searchQuery;
-    final filteredGroupedAlbums = _filterGroupedAlbums(
-      groupedAlbums,
-      searchQuery,
-    );
-    final filteredGroupedLocalAlbums = _filterGroupedLocalAlbums(
-      groupedLocalAlbums,
-      searchQuery,
-    );
-
     final unifiedItems = _getUnifiedItems(
       filterMode: filterMode,
       historyItems: historyItems,
@@ -2023,7 +2166,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     return Consumer(
       builder: (context, ref, child) {
         final queueCount = ref.watch(
-          downloadQueueProvider.select((s) => s.items.length),
+          downloadQueueLookupProvider.select((lookup) => lookup.itemIds.length),
         );
         if (queueCount == 0) {
           return const SliverToBoxAdapter(child: SizedBox.shrink());
@@ -2054,20 +2197,24 @@ class _QueueTabState extends ConsumerState<QueueTab> {
   Widget _buildQueueItemsSliver(BuildContext context, ColorScheme colorScheme) {
     return Consumer(
       builder: (context, ref, child) {
-        final queueItems = ref.watch(
-          downloadQueueProvider.select((s) => s.items),
+        final queueIdsSnapshot = ref.watch(
+          downloadQueueLookupProvider.select(
+            (lookup) => _QueueItemIdsSnapshot(lookup.itemIds),
+          ),
         );
-        if (queueItems.isEmpty) {
+        if (queueIdsSnapshot.ids.isEmpty) {
           return const SliverToBoxAdapter(child: SizedBox.shrink());
         }
         return SliverList(
           delegate: SliverChildBuilderDelegate((context, index) {
-            final item = queueItems[index];
-            return KeyedSubtree(
-              key: ValueKey(item.id),
-              child: _buildQueueItem(context, item, colorScheme),
+            final itemId = queueIdsSnapshot.ids[index];
+            return _QueueItemSliverRow(
+              key: ValueKey(itemId),
+              itemId: itemId,
+              colorScheme: colorScheme,
+              itemBuilder: _buildQueueItem,
             );
-          }, childCount: queueItems.length),
+          }, childCount: queueIdsSnapshot.ids.length),
         );
       },
     );
@@ -2093,7 +2240,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
 
     return CustomScrollView(
       slivers: [
-        if (totalTrackCount > 0 && !hasQueueItems && filterMode == 'all')
+        if (totalTrackCount > 0 && filterMode == 'all')
           SliverToBoxAdapter(
             child: Padding(
               padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
@@ -2143,7 +2290,6 @@ class _QueueTabState extends ConsumerState<QueueTab> {
 
         if ((filteredGroupedAlbums.isNotEmpty ||
                 filteredGroupedLocalAlbums.isNotEmpty) &&
-            !hasQueueItems &&
             filterMode == 'albums')
           SliverToBoxAdapter(
             child: Padding(
@@ -2180,7 +2326,6 @@ class _QueueTabState extends ConsumerState<QueueTab> {
         // Albums empty state with filter button
         if (filteredGroupedAlbums.isEmpty &&
             filteredGroupedLocalAlbums.isEmpty &&
-            !hasQueueItems &&
             filterMode == 'albums' &&
             (historyItems.isNotEmpty || localLibraryItems.isNotEmpty))
           SliverToBoxAdapter(
@@ -2331,7 +2476,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                 ),
 
         // Singles filter - show unified items (downloaded + local singles)
-        if (filterMode == 'singles' && !hasQueueItems)
+        if (filterMode == 'singles')
           SliverToBoxAdapter(
             child: Padding(
               padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
@@ -2559,6 +2704,9 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     _GroupedAlbum album,
     ColorScheme colorScheme,
   ) {
+    final embeddedCoverPath = _resolveDownloadedEmbeddedCoverPath(
+      album.sampleFilePath,
+    );
     return GestureDetector(
       onTap: () => _navigateToDownloadedAlbum(album),
       child: Column(
@@ -2569,7 +2717,27 @@ class _QueueTabState extends ConsumerState<QueueTab> {
               children: [
                 ClipRRect(
                   borderRadius: BorderRadius.circular(12),
-                  child: album.coverUrl != null
+                  child: embeddedCoverPath != null
+                      ? Image.file(
+                          File(embeddedCoverPath),
+                          fit: BoxFit.cover,
+                          width: double.infinity,
+                          height: double.infinity,
+                          cacheWidth: 300,
+                          cacheHeight: 300,
+                          errorBuilder: (context, error, stackTrace) =>
+                              Container(
+                                color: colorScheme.surfaceContainerHighest,
+                                child: Center(
+                                  child: Icon(
+                                    Icons.album,
+                                    color: colorScheme.onSurfaceVariant,
+                                    size: 48,
+                                  ),
+                                ),
+                              ),
+                        )
+                      : album.coverUrl != null
                       ? CachedNetworkImage(
                           imageUrl: album.coverUrl!,
                           fit: BoxFit.cover,
@@ -2946,13 +3114,13 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                             // show bytes downloaded instead of percentage
                             item.progress > 0
                                 ? (item.speedMBps > 0
-                                    ? '${(item.progress * 100).toStringAsFixed(0)}% • ${item.speedMBps.toStringAsFixed(1)} MB/s'
-                                    : '${(item.progress * 100).toStringAsFixed(0)}%')
+                                      ? '${(item.progress * 100).toStringAsFixed(0)}% • ${item.speedMBps.toStringAsFixed(1)} MB/s'
+                                      : '${(item.progress * 100).toStringAsFixed(0)}%')
                                 : (item.bytesReceived > 0
-                                    ? '${(item.bytesReceived / (1024 * 1024)).toStringAsFixed(1)} MB • ${item.speedMBps.toStringAsFixed(1)} MB/s'
-                                    : (item.speedMBps > 0
-                                        ? 'Downloading • ${item.speedMBps.toStringAsFixed(1)} MB/s'
-                                        : 'Starting...')),
+                                      ? '${(item.bytesReceived / (1024 * 1024)).toStringAsFixed(1)} MB • ${item.speedMBps.toStringAsFixed(1)} MB/s'
+                                      : (item.speedMBps > 0
+                                            ? 'Downloading • ${item.speedMBps.toStringAsFixed(1)} MB/s'
+                                            : 'Starting...')),
                             style: Theme.of(context).textTheme.labelSmall
                                 ?.copyWith(
                                   color: colorScheme.primary,
@@ -3139,6 +3307,26 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     double size,
   ) {
     final isDownloaded = item.source == LibraryItemSource.downloaded;
+    if (isDownloaded) {
+      final embeddedCoverPath = _resolveDownloadedEmbeddedCoverPath(
+        item.filePath,
+      );
+      if (embeddedCoverPath != null) {
+        return ClipRRect(
+          borderRadius: BorderRadius.circular(8),
+          child: Image.file(
+            File(embeddedCoverPath),
+            width: size,
+            height: size,
+            fit: BoxFit.cover,
+            cacheWidth: (size * 2).toInt(),
+            cacheHeight: (size * 2).toInt(),
+            errorBuilder: (context, error, stackTrace) =>
+                _buildPlaceholderCover(colorScheme, size, isDownloaded),
+          ),
+        );
+      }
+    }
 
     // Network URL cover (downloaded items)
     if (item.coverUrl != null) {
@@ -3220,6 +3408,30 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     ColorScheme colorScheme,
   ) {
     final isDownloaded = item.source == LibraryItemSource.downloaded;
+    if (isDownloaded) {
+      final embeddedCoverPath = _resolveDownloadedEmbeddedCoverPath(
+        item.filePath,
+      );
+      if (embeddedCoverPath != null) {
+        return ClipRRect(
+          borderRadius: BorderRadius.circular(8),
+          child: Image.file(
+            File(embeddedCoverPath),
+            fit: BoxFit.cover,
+            cacheWidth: 200,
+            cacheHeight: 200,
+            errorBuilder: (context, error, stackTrace) => Container(
+              color: colorScheme.surfaceContainerHighest,
+              child: Icon(
+                Icons.music_note,
+                color: colorScheme.onSurfaceVariant,
+                size: 32,
+              ),
+            ),
+          ),
+        );
+      }
+    }
 
     // Network URL cover (downloaded items)
     if (item.coverUrl != null) {
@@ -3668,6 +3880,31 @@ class _QueueTabState extends ConsumerState<QueueTab> {
   }
 }
 
+class _QueueItemSliverRow extends ConsumerWidget {
+  final String itemId;
+  final ColorScheme colorScheme;
+  final Widget Function(BuildContext, DownloadItem, ColorScheme) itemBuilder;
+
+  const _QueueItemSliverRow({
+    super.key,
+    required this.itemId,
+    required this.colorScheme,
+    required this.itemBuilder,
+  });
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final item = ref.watch(
+      downloadQueueLookupProvider.select((lookup) => lookup.byItemId[itemId]),
+    );
+    if (item == null) {
+      return const SizedBox.shrink();
+    }
+
+    return RepaintBoundary(child: itemBuilder(context, item, colorScheme));
+  }
+}
+
 class _FilterChip extends StatelessWidget {
   final String label;
   final int count;

lib/screens/search_screen.dart

@@ -26,7 +26,9 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
     if (widget.query.isNotEmpty) {
       WidgetsBinding.instance.addPostFrameCallback((_) {
         final settings = ref.read(settingsProvider);
-        ref.read(trackProvider.notifier).search(widget.query, metadataSource: settings.metadataSource);
+        ref
+            .read(trackProvider.notifier)
+            .search(widget.query, metadataSource: settings.metadataSource);
       });
     }
   }
@@ -41,19 +43,20 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
     final query = _searchController.text.trim();
     if (query.isNotEmpty) {
       final settings = ref.read(settingsProvider);
-      ref.read(trackProvider.notifier).search(query, metadataSource: settings.metadataSource);
+      ref
+          .read(trackProvider.notifier)
+          .search(query, metadataSource: settings.metadataSource);
     }
   }
 
   void _downloadTrack(Track track) {
     final settings = ref.read(settingsProvider);
-    ref.read(downloadQueueProvider.notifier).addToQueue(
-      track,
-      settings.defaultService,
-    );
-    ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(content: Text('Added "${track.name}" to queue')),
-    );
+    ref
+        .read(downloadQueueProvider.notifier)
+        .addToQueue(track, settings.defaultService);
+    ScaffoldMessenger.of(
+      context,
+    ).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
   }
 
   @override
@@ -78,10 +81,7 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
           autofocus: widget.query.isEmpty,
         ),
         actions: [
-          IconButton(
-            icon: const Icon(Icons.search),
-            onPressed: _search,
-          ),
+          IconButton(icon: const Icon(Icons.search), onPressed: _search),
         ],
       ),
       body: Column(
@@ -92,7 +92,7 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
             Padding(
               padding: const EdgeInsets.all(16.0),
               child: Text(
-                trackState.error!, 
+                trackState.error!,
                 style: TextStyle(color: colorScheme.error),
               ),
             ),
@@ -115,11 +115,7 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
       child: Column(
         mainAxisAlignment: MainAxisAlignment.center,
         children: [
-          Icon(
-            Icons.search, 
-            size: 64, 
-            color: colorScheme.onSurfaceVariant,
-          ),
+          Icon(Icons.search, size: 64, color: colorScheme.onSurfaceVariant),
           const SizedBox(height: 16),
           Text(
             'Search for tracks',
@@ -137,11 +133,13 @@ class _SearchScreenState extends ConsumerState<SearchScreen> {
       leading: track.coverUrl != null
           ? ClipRRect(
               borderRadius: BorderRadius.circular(8),
-child: CachedNetworkImage(
+              child: CachedNetworkImage(
                 imageUrl: track.coverUrl!,
                 width: 48,
                 height: 48,
                 fit: BoxFit.cover,
+                memCacheWidth: 144,
+                memCacheHeight: 144,
                 cacheManager: CoverCacheManager.instance,
               ),
             )
@@ -152,15 +150,18 @@ child: CachedNetworkImage(
                 color: colorScheme.surfaceContainerHighest,
                 borderRadius: BorderRadius.circular(8),
               ),
-              child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant),
+              child: Icon(
+                Icons.music_note,
+                color: colorScheme.onSurfaceVariant,
+              ),
             ),
       title: Text(track.name, maxLines: 1, overflow: TextOverflow.ellipsis),
       subtitle: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           Text(
-            track.artistName, 
-            maxLines: 1, 
+            track.artistName,
+            maxLines: 1,
             overflow: TextOverflow.ellipsis,
             style: TextStyle(color: colorScheme.onSurfaceVariant),
           ),

lib/screens/settings/about_page.dart

@@ -141,6 +141,14 @@ class AboutPage extends StatelessWidget {
                     title: context.l10n.aboutSpotiSaver,
                     subtitle: context.l10n.aboutSpotiSaverDesc,
                     onTap: () => _launchUrl('https://spotisaver.net'),
+                    showDivider: true,
+                  ),
+                  _AboutSettingsItem(
+                    icon: Icons.lyrics_outlined,
+                    title: 'Paxsenix',
+                    subtitle:
+                        'Partner lyrics proxy for Apple Music and QQ Music sources',
+                    onTap: () => _launchUrl('https://lyrics.paxsenix.org'),
                     showDivider: false,
                   ),
                 ],
@@ -384,6 +392,8 @@ class _ContributorItem extends StatelessWidget {
                     width: 40,
                     height: 40,
                     fit: BoxFit.cover,
+                    memCacheWidth: 120,
+                    memCacheHeight: 120,
                     cacheManager: CoverCacheManager.instance,
                     placeholder: (context, url) => Container(
                       width: 40,

lib/screens/settings/cache_management_page.dart

@@ -60,19 +60,30 @@ class _CacheManagementPageState extends ConsumerState<CacheManagementPage> {
   }
 
   Future<_CacheOverview> _buildOverview() async {
-    final appCacheDir = await getApplicationCacheDirectory();
-    final tempDir = await getTemporaryDirectory();
+    final appCacheDirFuture = getApplicationCacheDirectory();
+    final tempDirFuture = getTemporaryDirectory();
+    final appSupportDirFuture = getApplicationSupportDirectory();
+    final coverStatsFuture = CoverCacheManager.getStats();
+    final prefsFuture = SharedPreferences.getInstance();
+    final trackCacheEntriesFuture = _getTrackCacheSizeSafe();
+
+    final appCacheDir = await appCacheDirFuture;
+    final tempDir = await tempDirFuture;
     final appCachePath = p.normalize(appCacheDir.path);
     final tempPath = p.normalize(tempDir.path);
     final tempIsSameAsAppCache = appCachePath == tempPath;
 
-    final appCacheStats = await _scanDirectory(Directory(appCachePath));
-    final tempStats = tempIsSameAsAppCache
-        ? null
-        : await _scanDirectory(Directory(tempPath));
-    final coverStats = await CoverCacheManager.getStats();
+    final appCacheStatsFuture = _scanDirectory(Directory(appCachePath));
+    final tempStatsFuture = tempIsSameAsAppCache
+        ? Future<_DirectoryStats?>.value(null)
+        : _scanDirectory(Directory(tempPath));
 
-    final prefs = await SharedPreferences.getInstance();
+    final appSupportDir = await appSupportDirFuture;
+    final libraryCoverStatsFuture = _scanDirectory(
+      Directory('${appSupportDir.path}/library_covers'),
+    );
+
+    final prefs = await prefsFuture;
     final explorePayload = prefs.getString(_exploreCacheKey);
     final exploreTs = prefs.getInt(_exploreCacheTsKey);
     var exploreBytes = 0;
@@ -84,16 +95,11 @@ class _CacheManagementPageState extends ConsumerState<CacheManagementPage> {
     }
     final hasExploreCache = exploreBytes > 0;
 
-    int trackCacheEntries;
-    try {
-      trackCacheEntries = await PlatformBridge.getTrackCacheSize();
-    } catch (_) {
-      trackCacheEntries = 0;
-    }
-
-    final appSupportDir = await getApplicationSupportDirectory();
-    final libraryCoverDir = Directory('${appSupportDir.path}/library_covers');
-    final libraryCoverStats = await _scanDirectory(libraryCoverDir);
+    final appCacheStats = await appCacheStatsFuture;
+    final tempStats = await tempStatsFuture;
+    final coverStats = await coverStatsFuture;
+    final libraryCoverStats = await libraryCoverStatsFuture;
+    final trackCacheEntries = await trackCacheEntriesFuture;
 
     return _CacheOverview(
       appCachePath: appCachePath,
@@ -132,16 +138,37 @@ class _CacheManagementPageState extends ConsumerState<CacheManagementPage> {
     return _DirectoryStats(fileCount: fileCount, totalSizeBytes: totalSize);
   }
 
+  Future<int> _getTrackCacheSizeSafe() async {
+    try {
+      return await PlatformBridge.getTrackCacheSize();
+    } catch (_) {
+      return 0;
+    }
+  }
+
   Future<void> _clearDirectoryContents(String path) async {
     final directory = Directory(path);
     if (!await directory.exists()) return;
 
     try {
-      final entities = directory.listSync(followLinks: false);
-      for (final entity in entities) {
-        try {
-          await entity.delete(recursive: true);
-        } catch (_) {}
+      final entities = <FileSystemEntity>[];
+      await for (final entity in directory.list(followLinks: false)) {
+        entities.add(entity);
+      }
+
+      const deleteChunkSize = 24;
+      for (var i = 0; i < entities.length; i += deleteChunkSize) {
+        final end = (i + deleteChunkSize < entities.length)
+            ? i + deleteChunkSize
+            : entities.length;
+        final chunk = entities.sublist(i, end);
+        await Future.wait(
+          chunk.map((entity) async {
+            try {
+              await entity.delete(recursive: true);
+            } catch (_) {}
+          }),
+        );
       }
     } catch (_) {}
 
@@ -583,7 +610,9 @@ class _CacheManagementPageState extends ConsumerState<CacheManagementPage> {
                     subtitle: _buildSubtitle(
                       context.l10n.cacheTrackLookupDesc,
                       overview.trackCacheEntries > 0
-                          ? context.l10n.cacheEntries(overview.trackCacheEntries)
+                          ? context.l10n.cacheEntries(
+                              overview.trackCacheEntries,
+                            )
                           : context.l10n.cacheNoData,
                     ),
                     trailing: _buildClearTrailing(
@@ -611,7 +640,8 @@ class _CacheManagementPageState extends ConsumerState<CacheManagementPage> {
                   SettingsItem(
                     icon: Icons.cleaning_services_outlined,
                     title: context.l10n.cacheCleanupUnused,
-                    subtitle: '${context.l10n.cacheCleanupUnusedDesc}\n${context.l10n.cacheCleanupUnusedSubtitle}',
+                    subtitle:
+                        '${context.l10n.cacheCleanupUnusedDesc}\n${context.l10n.cacheCleanupUnusedSubtitle}',
                     trailing: _buildClearTrailing(
                       'cleanup_unused',
                       _cleanupUnusedData,

lib/screens/settings/donate_page.dart

@@ -68,7 +68,9 @@ class DonatePage extends StatelessWidget {
                   // Combined notice card
                   Card(
                     elevation: 0,
-                    color: colorScheme.secondaryContainer.withValues(alpha: 0.3),
+                    color: colorScheme.secondaryContainer.withValues(
+                      alpha: 0.3,
+                    ),
                     shape: RoundedRectangleBorder(
                       borderRadius: BorderRadius.circular(20),
                     ),
@@ -98,7 +100,8 @@ class DonatePage extends StatelessWidget {
                           const SizedBox(height: 10),
                           _NoticeLine(
                             icon: Icons.block,
-                            text: 'Not selling early access, premium features, or paywalls',
+                            text:
+                                'Not selling early access, premium features, or paywalls',
                             colorScheme: colorScheme,
                           ),
                           const SizedBox(height: 6),
@@ -110,36 +113,40 @@ class DonatePage extends StatelessWidget {
                           const SizedBox(height: 6),
                           _NoticeLine(
                             icon: Icons.favorite_border,
-                            text: 'Your support is the only way to keep this project alive',
+                            text:
+                                'Your support is the only way to keep this project alive',
                             colorScheme: colorScheme,
                           ),
                           Divider(
                             height: 24,
-                            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+                            color: colorScheme.outlineVariant.withValues(
+                              alpha: 0.3,
+                            ),
                           ),
                           _NoticeLine(
                             icon: Icons.history,
-                            text: 'Your name stays permanently in every version it was included in',
+                            text:
+                                'Your name stays permanently in every version it was included in',
                             colorScheme: colorScheme,
                           ),
                           const SizedBox(height: 6),
                           _NoticeLine(
                             icon: Icons.update,
-                            text: 'Supporter list is updated monthly and embedded in the app',
+                            text:
+                                'Supporter list is updated monthly and embedded in the app',
                             colorScheme: colorScheme,
                           ),
                           const SizedBox(height: 6),
                           _NoticeLine(
                             icon: Icons.cloud_off,
-                            text: 'No remote server -- everything is stored locally',
+                            text:
+                                'No remote server -- everything is stored locally',
                             colorScheme: colorScheme,
                           ),
                         ],
                       ),
                     ),
                   ),
-
-
                 ],
               ),
             ),
@@ -202,9 +209,12 @@ class _RecentDonorsCard extends StatelessWidget {
             const SizedBox(height: 16),
             _DonorTile(name: 'J', colorScheme: colorScheme),
             _DonorTile(name: 'Julian', colorScheme: colorScheme),
+            _DonorTile(name: 'matt_3050', colorScheme: colorScheme),
             _DonorTile(name: 'Daniel', colorScheme: colorScheme),
+            _DonorTile(name: '283Fabio', colorScheme: colorScheme),
+            _DonorTile(name: 'laflame', colorScheme: colorScheme),
             _DonorTile(
-              name: '283Fabio',
+              name: 'Elias el Autentico',
               colorScheme: colorScheme,
               showDivider: false,
             ),
@@ -255,21 +265,6 @@ class _DonateLinksCard extends StatelessWidget {
             endIndent: 16,
             color: colorScheme.outlineVariant.withValues(alpha: 0.3),
           ),
-          _DonateCardItem(
-            title: 'Buy Me a Coffee',
-            subtitle: 'buymeacoffee.com/zarzet',
-            customIcon: const BmacIcon(size: 22, color: Colors.black87),
-            color: const Color(0xFFFFDD00),
-            url: AppInfo.bmacUrl,
-            colorScheme: colorScheme,
-          ),
-          Divider(
-            height: 1,
-            thickness: 1,
-            indent: 74,
-            endIndent: 16,
-            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
-          ),
           _DonateCardItem(
             title: 'GitHub Sponsors',
             subtitle: 'github.com/sponsors/zarzet',
@@ -427,9 +422,9 @@ class _NoticeLine extends StatelessWidget {
         Expanded(
           child: Text(
             text,
-            style: Theme.of(context).textTheme.bodySmall?.copyWith(
-              color: colorScheme.onSurface,
-            ),
+            style: Theme.of(
+              context,
+            ).textTheme.bodySmall?.copyWith(color: colorScheme.onSurface),
           ),
         ),
       ],

lib/screens/settings/download_settings_page.dart

@@ -11,6 +11,7 @@ import 'package:spotiflac_android/providers/extension_provider.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
 import 'package:spotiflac_android/utils/app_bar_layout.dart';
 import 'package:spotiflac_android/utils/file_access.dart';
+import 'package:spotiflac_android/screens/settings/lyrics_provider_priority_page.dart';
 import 'package:spotiflac_android/widgets/settings_group.dart';
 
 class DownloadSettingsPage extends ConsumerStatefulWidget {
@@ -22,9 +23,10 @@ class DownloadSettingsPage extends ConsumerStatefulWidget {
 }
 
 class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
-  static const _builtInServices = ['tidal', 'qobuz'];
+  static const _builtInServices = ['tidal', 'qobuz', 'amazon'];
   int _androidSdkVersion = 0;
   bool _hasAllFilesAccess = false;
+  bool _artistFolderFiltersExpanded = false;
 
   @override
   void initState() {
@@ -248,7 +250,7 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
                           const SizedBox(width: 8),
                           Expanded(
                             child: Text(
-                              'Select Tidal or Qobuz above to configure quality',
+                              'Select Tidal, Qobuz, or Amazon above to configure quality',
                               style: Theme.of(context).textTheme.bodySmall
                                   ?.copyWith(
                                     color: colorScheme.onSurfaceVariant,
@@ -278,6 +280,62 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
                       ref,
                       settings.lyricsMode,
                     ),
+                  ),
+                  SettingsItem(
+                    icon: Icons.source_outlined,
+                    title: 'Lyrics Providers',
+                    subtitle: _getLyricsProvidersSubtitle(settings.lyricsProviders),
+                    onTap: () => Navigator.push(
+                      context,
+                      MaterialPageRoute(
+                        builder: (_) => const LyricsProviderPriorityPage(),
+                      ),
+                    ),
+                  ),
+                  SettingsSwitchItem(
+                    icon: Icons.translate_outlined,
+                    title: 'Netease: Include Translation',
+                    subtitle: settings.lyricsIncludeTranslationNetease
+                        ? 'Append translated lyrics when available'
+                        : 'Use original lyrics only',
+                    value: settings.lyricsIncludeTranslationNetease,
+                    onChanged: (value) => ref
+                        .read(settingsProvider.notifier)
+                        .setLyricsIncludeTranslationNetease(value),
+                  ),
+                  SettingsSwitchItem(
+                    icon: Icons.text_fields_outlined,
+                    title: 'Netease: Include Romanization',
+                    subtitle: settings.lyricsIncludeRomanizationNetease
+                        ? 'Append romanized lyrics when available'
+                        : 'Disabled',
+                    value: settings.lyricsIncludeRomanizationNetease,
+                    onChanged: (value) => ref
+                        .read(settingsProvider.notifier)
+                        .setLyricsIncludeRomanizationNetease(value),
+                  ),
+                  SettingsSwitchItem(
+                    icon: Icons.record_voice_over_outlined,
+                    title: 'Apple/QQ Multi-Person Word-by-Word',
+                    subtitle: settings.lyricsMultiPersonWordByWord
+                        ? 'Enable v1/v2 speaker and [bg:] tags'
+                        : 'Simplified word-by-word formatting',
+                    value: settings.lyricsMultiPersonWordByWord,
+                    onChanged: (value) => ref
+                        .read(settingsProvider.notifier)
+                        .setLyricsMultiPersonWordByWord(value),
+                  ),
+                  SettingsItem(
+                    icon: Icons.language_outlined,
+                    title: 'Musixmatch Language',
+                    subtitle: settings.musixmatchLanguage.isEmpty
+                        ? 'Auto (original)'
+                        : settings.musixmatchLanguage.toUpperCase(),
+                    onTap: () => _showMusixmatchLanguagePicker(
+                      context,
+                      ref,
+                      settings.musixmatchLanguage,
+                    ),
                     showDivider: false,
                   ),
                 ],
@@ -363,7 +421,53 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
                     onChanged: (value) => ref
                         .read(settingsProvider.notifier)
                         .setUseAlbumArtistForFolders(value),
-                    showDivider: false,
+                  ),
+                  SettingsItem(
+                    icon: Icons.filter_alt_outlined,
+                    title: 'Artist Name Filters',
+                    subtitle: _getArtistFolderFilterSubtitle(
+                      context,
+                      usePrimaryArtistOnly: settings.usePrimaryArtistOnly,
+                      filterAlbumArtistContributors:
+                          settings.filterContributingArtistsInAlbumArtist,
+                    ),
+                    trailing: Icon(
+                      _artistFolderFiltersExpanded
+                          ? Icons.expand_less
+                          : Icons.expand_more,
+                    ),
+                    onTap: () {
+                      setState(() {
+                        _artistFolderFiltersExpanded =
+                            !_artistFolderFiltersExpanded;
+                      });
+                    },
+                    showDivider: !_artistFolderFiltersExpanded,
+                  ),
+                  if (_artistFolderFiltersExpanded)
+                    SettingsSwitchItem(
+                      icon: Icons.person_outline,
+                      title: context.l10n.downloadUsePrimaryArtistOnly,
+                      subtitle: settings.usePrimaryArtistOnly
+                          ? context.l10n.downloadUsePrimaryArtistOnlyEnabled
+                          : context.l10n.downloadUsePrimaryArtistOnlyDisabled,
+                      value: settings.usePrimaryArtistOnly,
+                      onChanged: (value) => ref
+                          .read(settingsProvider.notifier)
+                          .setUsePrimaryArtistOnly(value),
+                    ),
+                  if (_artistFolderFiltersExpanded)
+                    SettingsSwitchItem(
+                      icon: Icons.group_remove_outlined,
+                      title: 'Filter contributing artists in Album Artist',
+                      subtitle: settings.filterContributingArtistsInAlbumArtist
+                          ? 'Album Artist metadata uses primary artist only'
+                          : 'Keep full Album Artist metadata value',
+                      value: settings.filterContributingArtistsInAlbumArtist,
+                      onChanged: (value) => ref
+                          .read(settingsProvider.notifier)
+                          .setFilterContributingArtistsInAlbumArtist(value),
+                      showDivider: false,
                     ),
                 ],
               ),
@@ -573,14 +677,28 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
     final controller = TextEditingController(text: current);
     final colorScheme = Theme.of(context).colorScheme;
 
-    final tags = [
+    final basicTags = [
       '{artist}',
       '{title}',
       '{album}',
       '{track}',
       '{year}',
+      '{date}',
       '{disc}',
     ];
+    final advancedTags = [
+      '{track_raw}',
+      '{track:02}',
+      '{track:1}',
+      '{date:%Y}',
+      '{date:%Y-%m-%d}',
+      '{disc_raw}',
+      '{disc:02}',
+    ];
+    var showAdvancedTags = RegExp(
+      r'\{(?:track_raw|disc_raw|track:\d+|disc:\d+|date:[^}]+)\}',
+      caseSensitive: false,
+    ).hasMatch(current);
 
     void insertTag(String tag) {
       final text = controller.text;
@@ -612,130 +730,164 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
       shape: const RoundedRectangleBorder(
         borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
       ),
-      builder: (context) => Padding(
-        padding: EdgeInsets.only(
-          bottom: MediaQuery.of(context).viewInsets.bottom,
-        ),
-        child: SingleChildScrollView(
-          child: SafeArea(
-            child: Padding(
-              padding: const EdgeInsets.all(24),
-              child: Column(
-                mainAxisSize: MainAxisSize.min,
-                crossAxisAlignment: CrossAxisAlignment.stretch,
-                children: [
-                  Center(
-                    child: Container(
-                      width: 32,
-                      height: 4,
-                      margin: const EdgeInsets.only(bottom: 24),
-                      decoration: BoxDecoration(
-                        color: colorScheme.outlineVariant,
-                        borderRadius: BorderRadius.circular(2),
-                      ),
-                    ),
-                  ),
-                  Text(
-                    context.l10n.filenameFormat,
-                    style: Theme.of(context).textTheme.headlineSmall?.copyWith(
-                      fontWeight: FontWeight.bold,
-                    ),
-                    textAlign: TextAlign.center,
-                  ),
-                  const SizedBox(height: 8),
-                  Text(
-                    'Customize how your files are named.',
-                    style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                      color: colorScheme.onSurfaceVariant,
-                    ),
-                    textAlign: TextAlign.center,
-                  ),
-                  const SizedBox(height: 24),
-
-                  TextField(
-                    controller: controller,
-                    decoration: InputDecoration(
-                      hintText: '{artist} - {title}',
-                      filled: true,
-                      fillColor: colorScheme.surfaceContainerHighest.withValues(
-                        alpha: 0.3,
-                      ),
-                      border: OutlineInputBorder(
-                        borderRadius: BorderRadius.circular(16),
-                        borderSide: BorderSide.none,
-                      ),
-                    ),
-                    autofocus: true,
-                  ),
-                  const SizedBox(height: 24),
-
-                  Text(
-                    'Tap to insert tag:',
-                    style: Theme.of(context).textTheme.titleSmall?.copyWith(
-                      fontWeight: FontWeight.bold,
-                    ),
-                  ),
-                  const SizedBox(height: 12),
-                  Wrap(
-                    spacing: 8,
-                    runSpacing: 8,
-                    children: tags.map((tag) {
-                      return ActionChip(
-                        label: Text(tag),
-                        onPressed: () => insertTag(tag),
-                        backgroundColor: colorScheme.surfaceContainerHighest
-                            .withValues(alpha: 0.5),
-                        side: BorderSide.none,
-                        shape: RoundedRectangleBorder(
-                          borderRadius: BorderRadius.circular(12),
+      builder: (context) => StatefulBuilder(
+        builder: (context, setModalState) => Padding(
+          padding: EdgeInsets.only(
+            bottom: MediaQuery.of(context).viewInsets.bottom,
+          ),
+          child: SingleChildScrollView(
+            child: SafeArea(
+              child: Padding(
+                padding: const EdgeInsets.all(24),
+                child: Column(
+                  mainAxisSize: MainAxisSize.min,
+                  crossAxisAlignment: CrossAxisAlignment.stretch,
+                  children: [
+                    Center(
+                      child: Container(
+                        width: 32,
+                        height: 4,
+                        margin: const EdgeInsets.only(bottom: 24),
+                        decoration: BoxDecoration(
+                          color: colorScheme.outlineVariant,
+                          borderRadius: BorderRadius.circular(2),
                         ),
-                        labelStyle: TextStyle(
-                          color: colorScheme.onSurface,
-                          fontWeight: FontWeight.w500,
+                      ),
+                    ),
+                    Text(
+                      context.l10n.filenameFormat,
+                      style: Theme.of(context).textTheme.headlineSmall
+                          ?.copyWith(fontWeight: FontWeight.bold),
+                      textAlign: TextAlign.center,
+                    ),
+                    const SizedBox(height: 8),
+                    Text(
+                      'Customize how your files are named.',
+                      style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                        color: colorScheme.onSurfaceVariant,
+                      ),
+                      textAlign: TextAlign.center,
+                    ),
+                    const SizedBox(height: 24),
+
+                    TextField(
+                      controller: controller,
+                      decoration: InputDecoration(
+                        hintText: '{artist} - {title}',
+                        filled: true,
+                        fillColor: colorScheme.surfaceContainerHighest
+                            .withValues(alpha: 0.3),
+                        border: OutlineInputBorder(
+                          borderRadius: BorderRadius.circular(16),
+                          borderSide: BorderSide.none,
                         ),
-                      );
-                    }).toList(),
-                  ),
+                      ),
+                      autofocus: true,
+                    ),
+                    const SizedBox(height: 24),
 
-                  const SizedBox(height: 32),
-
-                  Row(
-                    children: [
-                      Expanded(
-                        child: TextButton(
-                          onPressed: () => Navigator.pop(context),
-                          style: TextButton.styleFrom(
-                            padding: const EdgeInsets.symmetric(vertical: 16),
-                            shape: RoundedRectangleBorder(
-                              borderRadius: BorderRadius.circular(16),
-                            ),
+                    Text(
+                      'Tap to insert tag:',
+                      style: Theme.of(context).textTheme.titleSmall?.copyWith(
+                        fontWeight: FontWeight.bold,
+                      ),
+                    ),
+                    const SizedBox(height: 12),
+                    Wrap(
+                      spacing: 8,
+                      runSpacing: 8,
+                      children: basicTags.map((tag) {
+                        return ActionChip(
+                          label: Text(tag),
+                          onPressed: () => insertTag(tag),
+                          backgroundColor: colorScheme.surfaceContainerHighest
+                              .withValues(alpha: 0.5),
+                          side: BorderSide.none,
+                          shape: RoundedRectangleBorder(
+                            borderRadius: BorderRadius.circular(12),
                           ),
-                          child: Text(context.l10n.dialogCancel),
-                        ),
-                      ),
-                      const SizedBox(width: 12),
-                      Expanded(
-                        flex: 2,
-                        child: FilledButton(
-                          onPressed: () {
-                            ref
-                                .read(settingsProvider.notifier)
-                                .setFilenameFormat(controller.text);
-                            Navigator.pop(context);
-                          },
-                          style: FilledButton.styleFrom(
-                            padding: const EdgeInsets.symmetric(vertical: 16),
-                            shape: RoundedRectangleBorder(
-                              borderRadius: BorderRadius.circular(16),
-                            ),
+                          labelStyle: TextStyle(
+                            color: colorScheme.onSurface,
+                            fontWeight: FontWeight.w500,
                           ),
-                          child: Text(context.l10n.dialogSave),
-                        ),
+                        );
+                      }).toList(),
+                    ),
+                    const SizedBox(height: 12),
+                    SwitchListTile(
+                      value: showAdvancedTags,
+                      onChanged: (value) =>
+                          setModalState(() => showAdvancedTags = value),
+                      contentPadding: EdgeInsets.zero,
+                      title: Text(context.l10n.filenameShowAdvancedTags),
+                      subtitle: Text(
+                        context.l10n.filenameShowAdvancedTagsDescription,
+                      ),
+                    ),
+                    if (showAdvancedTags) ...[
+                      const SizedBox(height: 8),
+                      Wrap(
+                        spacing: 8,
+                        runSpacing: 8,
+                        children: advancedTags.map((tag) {
+                          return ActionChip(
+                            label: Text(tag),
+                            onPressed: () => insertTag(tag),
+                            backgroundColor: colorScheme.surfaceContainerHighest
+                                .withValues(alpha: 0.5),
+                            side: BorderSide.none,
+                            shape: RoundedRectangleBorder(
+                              borderRadius: BorderRadius.circular(12),
+                            ),
+                            labelStyle: TextStyle(
+                              color: colorScheme.onSurface,
+                              fontWeight: FontWeight.w500,
+                            ),
+                          );
+                        }).toList(),
                       ),
                     ],
-                  ),
-                  const SizedBox(height: 8),
-                ],
+
+                    const SizedBox(height: 32),
+
+                    Row(
+                      children: [
+                        Expanded(
+                          child: TextButton(
+                            onPressed: () => Navigator.pop(context),
+                            style: TextButton.styleFrom(
+                              padding: const EdgeInsets.symmetric(vertical: 16),
+                              shape: RoundedRectangleBorder(
+                                borderRadius: BorderRadius.circular(16),
+                              ),
+                            ),
+                            child: Text(context.l10n.dialogCancel),
+                          ),
+                        ),
+                        const SizedBox(width: 12),
+                        Expanded(
+                          flex: 2,
+                          child: FilledButton(
+                            onPressed: () {
+                              ref
+                                  .read(settingsProvider.notifier)
+                                  .setFilenameFormat(controller.text);
+                              Navigator.pop(context);
+                            },
+                            style: FilledButton.styleFrom(
+                              padding: const EdgeInsets.symmetric(vertical: 16),
+                              shape: RoundedRectangleBorder(
+                                borderRadius: BorderRadius.circular(16),
+                              ),
+                            ),
+                            child: Text(context.l10n.dialogSave),
+                          ),
+                        ),
+                      ],
+                    ),
+                    const SizedBox(height: 8),
+                  ],
+                ),
               ),
             ),
           ),
@@ -925,7 +1077,10 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
                       if (ctx.mounted) {
                         ScaffoldMessenger.of(ctx).showSnackBar(
                           SnackBar(
-                            content: Text(validation.errorReason ?? context.l10n.setupIcloudNotSupported),
+                            content: Text(
+                              validation.errorReason ??
+                                  context.l10n.setupIcloudNotSupported,
+                            ),
                             backgroundColor: Theme.of(ctx).colorScheme.error,
                             duration: const Duration(seconds: 4),
                           ),
@@ -988,6 +1143,20 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
     }
   }
 
+  String _getArtistFolderFilterSubtitle(
+    BuildContext context, {
+    required bool usePrimaryArtistOnly,
+    required bool filterAlbumArtistContributors,
+  }) {
+    final statuses = <String>[
+      usePrimaryArtistOnly ? 'Primary only: On' : 'Primary only: Off',
+      filterAlbumArtistContributors
+          ? 'Album Artist metadata: Primary only'
+          : 'Album Artist metadata: Full',
+    ];
+    return statuses.join(' | ');
+  }
+
   String _getLyricsModeLabel(BuildContext context, String mode) {
     switch (mode) {
       case 'external':
@@ -1071,6 +1240,111 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
     );
   }
 
+  static const _providerDisplayNames = <String, String>{
+    'lrclib': 'LRCLIB',
+    'netease': 'Netease',
+    'musixmatch': 'Musixmatch',
+    'apple_music': 'Apple Music',
+    'qqmusic': 'QQ Music',
+  };
+
+  String _getLyricsProvidersSubtitle(List<String> providers) {
+    if (providers.isEmpty) return 'None enabled';
+    return providers
+        .map((p) => _providerDisplayNames[p] ?? p)
+        .join(' > ');
+  }
+
+  String _normalizeMusixmatchLanguage(String value) {
+    final normalized = value.trim().toLowerCase();
+    return normalized.replaceAll(RegExp(r'[^a-z0-9\-_]'), '');
+  }
+
+  void _showMusixmatchLanguagePicker(
+    BuildContext context,
+    WidgetRef ref,
+    String currentLanguage,
+  ) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final controller = TextEditingController(text: currentLanguage);
+
+    showModalBottomSheet(
+      context: context,
+      backgroundColor: colorScheme.surfaceContainerHigh,
+      shape: const RoundedRectangleBorder(
+        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
+      ),
+      isScrollControlled: true,
+      builder: (context) => Padding(
+        padding: EdgeInsets.only(
+          left: 24,
+          right: 24,
+          top: 24,
+          bottom: 24 + MediaQuery.of(context).viewInsets.bottom,
+        ),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(
+              'Musixmatch Language',
+              style: Theme.of(context).textTheme.titleLarge?.copyWith(
+                fontWeight: FontWeight.bold,
+              ),
+            ),
+            const SizedBox(height: 8),
+            Text(
+              'Set preferred language code (example: en, es, ja). Leave empty for auto.',
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                color: colorScheme.onSurfaceVariant,
+              ),
+            ),
+            const SizedBox(height: 16),
+            TextField(
+              controller: controller,
+              textInputAction: TextInputAction.done,
+              decoration: const InputDecoration(
+                labelText: 'Language code',
+                hintText: 'auto / en / es / ja',
+              ),
+            ),
+            const SizedBox(height: 16),
+            Row(
+              mainAxisAlignment: MainAxisAlignment.end,
+              children: [
+                TextButton(
+                  onPressed: () => Navigator.pop(context),
+                  child: Text(context.l10n.dialogCancel),
+                ),
+                const SizedBox(width: 8),
+                TextButton(
+                  onPressed: () {
+                    ref.read(settingsProvider.notifier).setMusixmatchLanguage('');
+                    Navigator.pop(context);
+                  },
+                  child: const Text('Auto'),
+                ),
+                const SizedBox(width: 8),
+                FilledButton(
+                  onPressed: () {
+                    final normalized = _normalizeMusixmatchLanguage(
+                      controller.text,
+                    );
+                    ref
+                        .read(settingsProvider.notifier)
+                        .setMusixmatchLanguage(normalized);
+                    Navigator.pop(context);
+                  },
+                  child: Text(context.l10n.dialogSave),
+                ),
+              ],
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
   String _getTidalHighFormatLabel(String format) {
     switch (format) {
       case 'mp3_320':
@@ -1354,6 +1628,7 @@ class _ServiceSelector extends ConsumerWidget {
     final isExtensionService = ![
       'tidal',
       'qobuz',
+      'amazon',
     ].contains(currentService);
     final isCurrentExtensionEnabled = isExtensionService
         ? extensionProviders.any((e) => e.id == currentService)
@@ -1380,6 +1655,13 @@ class _ServiceSelector extends ConsumerWidget {
                 isSelected: effectiveService == 'qobuz',
                 onTap: () => onChanged('qobuz'),
               ),
+              const SizedBox(width: 8),
+              _ServiceChip(
+                icon: Icons.shopping_bag_outlined,
+                label: 'Amazon',
+                isSelected: effectiveService == 'amazon',
+                onTap: () => onChanged('amazon'),
+              ),
             ],
           ),
           if (extensionProviders.isNotEmpty) ...[
@@ -1436,9 +1718,7 @@ class _ServiceChip extends StatelessWidget {
 
     return Expanded(
       child: Material(
-        color: isSelected
-            ? colorScheme.primaryContainer
-            : unselectedColor,
+        color: isSelected ? colorScheme.primaryContainer : unselectedColor,
         borderRadius: BorderRadius.circular(12),
         child: InkWell(
           onTap: onTap,

lib/screens/settings/extension_detail_page.dart

@@ -218,6 +218,11 @@ class _ExtensionDetailPageState extends ConsumerState<ExtensionDetailPage> {
                   title: context.l10n.extensionDownloadProvider,
                   enabled: extension.hasDownloadProvider,
                 ),
+                _CapabilityItem(
+                  icon: Icons.lyrics,
+                  title: context.l10n.extensionLyricsProvider,
+                  enabled: extension.hasLyricsProvider,
+                ),
                 _CapabilityItem(
                   icon: Icons.manage_search,
                   title: context.l10n.extensionsSearchProvider,

lib/screens/settings/lyrics_provider_priority_page.dart

@@ -0,0 +1,572 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/utils/app_bar_layout.dart';
+import 'package:spotiflac_android/widgets/settings_group.dart';
+
+class LyricsProviderPriorityPage extends ConsumerStatefulWidget {
+  const LyricsProviderPriorityPage({super.key});
+
+  @override
+  ConsumerState<LyricsProviderPriorityPage> createState() =>
+      _LyricsProviderPriorityPageState();
+}
+
+class _LyricsProviderPriorityPageState
+    extends ConsumerState<LyricsProviderPriorityPage> {
+  static const _allProviderIds = [
+    'lrclib',
+    'netease',
+    'musixmatch',
+    'apple_music',
+    'qqmusic',
+  ];
+
+  late List<String> _enabledProviders;
+  late List<String> _initialProviders;
+  bool _hasChanges = false;
+
+  List<String> get _disabledProviders => _allProviderIds
+      .where((id) => !_enabledProviders.contains(id))
+      .toList();
+
+  @override
+  void initState() {
+    super.initState();
+    final settings = ref.read(settingsProvider);
+    _enabledProviders = List.from(settings.lyricsProviders);
+    _initialProviders = List.from(settings.lyricsProviders);
+  }
+
+  void _markChanged() {
+    final changed = _enabledProviders.length != _initialProviders.length ||
+        !_enabledProviders
+            .asMap()
+            .entries
+            .every((e) =>
+                e.key < _initialProviders.length &&
+                _initialProviders[e.key] == e.value);
+    setState(() => _hasChanges = changed);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final topPadding = normalizedHeaderTopPadding(context);
+    final disabled = _disabledProviders;
+
+    return PopScope(
+      canPop: !_hasChanges,
+      onPopInvokedWithResult: (didPop, result) async {
+        if (didPop) return;
+        final shouldPop = await _confirmDiscard(context);
+        if (shouldPop && context.mounted) {
+          Navigator.pop(context);
+        }
+      },
+      child: Scaffold(
+        body: CustomScrollView(
+          slivers: [
+            // ── Collapsing App Bar ──
+            SliverAppBar(
+              expandedHeight: 120 + topPadding,
+              collapsedHeight: kToolbarHeight,
+              floating: false,
+              pinned: true,
+              backgroundColor: colorScheme.surface,
+              surfaceTintColor: Colors.transparent,
+              leading: IconButton(
+                icon: const Icon(Icons.arrow_back),
+                onPressed: () async {
+                  if (_hasChanges) {
+                    final shouldPop = await _confirmDiscard(context);
+                    if (shouldPop && context.mounted) {
+                      Navigator.pop(context);
+                    }
+                  } else {
+                    Navigator.pop(context);
+                  }
+                },
+              ),
+              actions: [
+                if (_hasChanges)
+                  TextButton(
+                    onPressed: _saveChanges,
+                    child: const Text('Save'),
+                  ),
+              ],
+              flexibleSpace: LayoutBuilder(
+                builder: (context, constraints) {
+                  final maxHeight = 120 + topPadding;
+                  final minHeight = kToolbarHeight + topPadding;
+                  final expandRatio = ((constraints.maxHeight - minHeight) /
+                          (maxHeight - minHeight))
+                      .clamp(0.0, 1.0);
+                  final leftPadding = 56 - (32 * expandRatio);
+                  return FlexibleSpaceBar(
+                    expandedTitleScale: 1.0,
+                    titlePadding:
+                        EdgeInsets.only(left: leftPadding, bottom: 16),
+                    title: Text(
+                      'Lyrics Providers',
+                      style: TextStyle(
+                        fontSize: 20 + (8 * expandRatio),
+                        fontWeight: FontWeight.bold,
+                        color: colorScheme.onSurface,
+                      ),
+                    ),
+                  );
+                },
+              ),
+            ),
+
+            // ── Description ──
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.fromLTRB(16, 4, 16, 8),
+                child: Text(
+                  'Enable, disable and reorder lyrics sources. '
+                  'Providers are tried top-to-bottom until lyrics are found.',
+                  style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                        color: colorScheme.onSurfaceVariant,
+                      ),
+                ),
+              ),
+            ),
+
+            // ── Enabled section header ──
+            if (_enabledProviders.isNotEmpty)
+              SliverToBoxAdapter(
+                child: SettingsSectionHeader(
+                  title: 'Enabled (${_enabledProviders.length})',
+                ),
+              ),
+
+            // ── Reorderable enabled list ──
+            if (_enabledProviders.isNotEmpty)
+              SliverPadding(
+                padding: const EdgeInsets.symmetric(horizontal: 16),
+                sliver: SliverReorderableList(
+                  itemCount: _enabledProviders.length,
+                  itemBuilder: (context, index) {
+                    final id = _enabledProviders[index];
+                    final info = _getLyricsProviderInfo(id);
+                    return _EnabledProviderItem(
+                      key: ValueKey(id),
+                      providerId: id,
+                      info: info,
+                      index: index,
+                      isFirst: index == 0,
+                      onToggle: () => _disableProvider(id),
+                    );
+                  },
+                  onReorder: (oldIndex, newIndex) {
+                    setState(() {
+                      if (newIndex > oldIndex) newIndex -= 1;
+                      final item = _enabledProviders.removeAt(oldIndex);
+                      _enabledProviders.insert(newIndex, item);
+                    });
+                    _markChanged();
+                  },
+                ),
+              ),
+
+            // ── Disabled section header ──
+            if (disabled.isNotEmpty)
+              SliverToBoxAdapter(
+                child: SettingsSectionHeader(
+                  title: 'Disabled (${disabled.length})',
+                ),
+              ),
+
+            // ── Disabled list ──
+            if (disabled.isNotEmpty)
+              SliverPadding(
+                padding: const EdgeInsets.symmetric(horizontal: 16),
+                sliver: SliverList(
+                  delegate: SliverChildBuilderDelegate(
+                    (context, index) {
+                      final id = disabled[index];
+                      final info = _getLyricsProviderInfo(id);
+                      return _DisabledProviderItem(
+                        key: ValueKey(id),
+                        providerId: id,
+                        info: info,
+                        onToggle: () => _enableProvider(id),
+                      );
+                    },
+                    childCount: disabled.length,
+                  ),
+                ),
+              ),
+
+            // ── Info banner ──
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Container(
+                  padding: const EdgeInsets.all(12),
+                  decoration: BoxDecoration(
+                    color:
+                        colorScheme.tertiaryContainer.withValues(alpha: 0.3),
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                  child: Row(
+                    children: [
+                      Icon(Icons.info_outline,
+                          size: 20, color: colorScheme.tertiary),
+                      const SizedBox(width: 12),
+                      Expanded(
+                        child: Text(
+                          'Extension lyrics providers always run before '
+                          'built-in providers. At least one provider must '
+                          'remain enabled.',
+                          style:
+                              Theme.of(context).textTheme.bodySmall?.copyWith(
+                                    color: colorScheme.onTertiaryContainer,
+                                  ),
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+            ),
+
+            const SliverToBoxAdapter(child: SizedBox(height: 32)),
+          ],
+        ),
+      ),
+    );
+  }
+
+  // ── State mutations ──
+
+  void _enableProvider(String id) {
+    setState(() => _enabledProviders.add(id));
+    _markChanged();
+  }
+
+  void _disableProvider(String id) {
+    if (_enabledProviders.length <= 1) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text('At least one provider must remain enabled'),
+        ),
+      );
+      return;
+    }
+    setState(() => _enabledProviders.remove(id));
+    _markChanged();
+  }
+
+  // ── Save / Discard ──
+
+  Future<void> _saveChanges() async {
+    ref
+        .read(settingsProvider.notifier)
+        .setLyricsProviders(List<String>.from(_enabledProviders));
+    setState(() {
+      _initialProviders = List.from(_enabledProviders);
+      _hasChanges = false;
+    });
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('Lyrics provider priority saved')),
+      );
+    }
+  }
+
+  Future<bool> _confirmDiscard(BuildContext context) async {
+    final result = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Discard changes?'),
+        content:
+            const Text('You have unsaved changes that will be lost.'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context, false),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.pop(context, true),
+            child: const Text('Discard'),
+          ),
+        ],
+      ),
+    );
+    return result ?? false;
+  }
+
+  // ── Provider metadata ──
+
+  static _LyricsProviderInfo _getLyricsProviderInfo(String id) {
+    switch (id) {
+      case 'lrclib':
+        return _LyricsProviderInfo(
+          name: 'LRCLIB',
+          description: 'Open-source synced lyrics database',
+          icon: Icons.subtitles_outlined,
+        );
+      case 'netease':
+        return _LyricsProviderInfo(
+          name: 'Netease',
+          description: 'NetEase Cloud Music (good for Asian songs)',
+          icon: Icons.cloud_outlined,
+        );
+      case 'musixmatch':
+        return _LyricsProviderInfo(
+          name: 'Musixmatch',
+          description: 'Largest lyrics database (multi-language)',
+          icon: Icons.translate,
+        );
+      case 'apple_music':
+        return _LyricsProviderInfo(
+          name: 'Apple Music',
+          description: 'Word-by-word synced lyrics (via proxy)',
+          icon: Icons.music_note,
+        );
+      case 'qqmusic':
+        return _LyricsProviderInfo(
+          name: 'QQ Music',
+          description: 'QQ Music (good for Chinese songs, via proxy)',
+          icon: Icons.queue_music,
+        );
+      default:
+        return _LyricsProviderInfo(
+          name: id,
+          description: 'Extension provider',
+          icon: Icons.extension,
+        );
+    }
+  }
+}
+
+// ═══════════════════════════════════════════════════════════════════════════
+//  Enabled provider card (reorderable)
+// ═══════════════════════════════════════════════════════════════════════════
+
+class _EnabledProviderItem extends StatelessWidget {
+  final String providerId;
+  final _LyricsProviderInfo info;
+  final int index;
+  final bool isFirst;
+  final VoidCallback onToggle;
+
+  const _EnabledProviderItem({
+    super.key,
+    required this.providerId,
+    required this.info,
+    required this.index,
+    required this.isFirst,
+    required this.onToggle,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+
+    final backgroundColor = isDark
+        ? Color.alphaBlend(
+            Colors.white.withValues(alpha: 0.05),
+            colorScheme.surface,
+          )
+        : colorScheme.surfaceContainerHigh;
+
+    return Padding(
+      padding: const EdgeInsets.only(bottom: 8),
+      child: Material(
+        color: backgroundColor,
+        borderRadius: BorderRadius.circular(16),
+        child: ReorderableDragStartListener(
+          index: index,
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+            child: Row(
+              children: [
+                // Numbered badge
+                Container(
+                  width: 28,
+                  height: 28,
+                  decoration: BoxDecoration(
+                    color: isFirst
+                        ? colorScheme.primaryContainer
+                        : colorScheme.surfaceContainerHighest,
+                    shape: BoxShape.circle,
+                  ),
+                  child: Center(
+                    child: Text(
+                      '${index + 1}',
+                      style: TextStyle(
+                        fontWeight: FontWeight.bold,
+                        color: isFirst
+                            ? colorScheme.onPrimaryContainer
+                            : colorScheme.onSurfaceVariant,
+                      ),
+                    ),
+                  ),
+                ),
+                const SizedBox(width: 16),
+                // Icon
+                Icon(info.icon, color: colorScheme.primary),
+                const SizedBox(width: 12),
+                // Name + description
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        info.name,
+                        style:
+                            Theme.of(context).textTheme.bodyLarge?.copyWith(
+                                  fontWeight: FontWeight.w500,
+                                ),
+                      ),
+                      Text(
+                        info.description,
+                        style:
+                            Theme.of(context).textTheme.bodySmall?.copyWith(
+                                  color: colorScheme.onSurfaceVariant,
+                                ),
+                      ),
+                    ],
+                  ),
+                ),
+                // Enable/disable switch
+                SizedBox(
+                  height: 32,
+                  child: FittedBox(
+                    child: Switch(
+                      value: true,
+                      onChanged: (_) => onToggle(),
+                    ),
+                  ),
+                ),
+                const SizedBox(width: 4),
+                // Drag handle
+                Icon(
+                  Icons.drag_handle,
+                  color: colorScheme.onSurfaceVariant,
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+// ═══════════════════════════════════════════════════════════════════════════
+//  Disabled provider card
+// ═══════════════════════════════════════════════════════════════════════════
+
+class _DisabledProviderItem extends StatelessWidget {
+  final String providerId;
+  final _LyricsProviderInfo info;
+  final VoidCallback onToggle;
+
+  const _DisabledProviderItem({
+    super.key,
+    required this.providerId,
+    required this.info,
+    required this.onToggle,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+
+    final backgroundColor = isDark
+        ? Color.alphaBlend(
+            Colors.white.withValues(alpha: 0.03),
+            colorScheme.surface,
+          )
+        : colorScheme.surfaceContainerLow;
+
+    return Padding(
+      padding: const EdgeInsets.only(bottom: 8),
+      child: Opacity(
+        opacity: 0.6,
+        child: Material(
+          color: backgroundColor,
+          borderRadius: BorderRadius.circular(16),
+          child: InkWell(
+            borderRadius: BorderRadius.circular(16),
+            onTap: onToggle,
+            child: Padding(
+              padding:
+                  const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+              child: Row(
+                children: [
+                  // Empty space aligned with numbered badge
+                  const SizedBox(width: 28),
+                  const SizedBox(width: 16),
+                  // Icon (muted)
+                  Icon(info.icon, color: colorScheme.outline),
+                  const SizedBox(width: 12),
+                  // Name + description
+                  Expanded(
+                    child: Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: [
+                        Text(
+                          info.name,
+                          style: Theme.of(context)
+                              .textTheme
+                              .bodyLarge
+                              ?.copyWith(
+                                fontWeight: FontWeight.w500,
+                                color: colorScheme.onSurfaceVariant,
+                              ),
+                        ),
+                        Text(
+                          info.description,
+                          style: Theme.of(context)
+                              .textTheme
+                              .bodySmall
+                              ?.copyWith(
+                                color: colorScheme.outline,
+                              ),
+                        ),
+                      ],
+                    ),
+                  ),
+                  // Switch
+                  SizedBox(
+                    height: 32,
+                    child: FittedBox(
+                      child: Switch(
+                        value: false,
+                        onChanged: (_) => onToggle(),
+                      ),
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+// ═══════════════════════════════════════════════════════════════════════════
+//  Provider info model
+// ═══════════════════════════════════════════════════════════════════════════
+
+class _LyricsProviderInfo {
+  final String name;
+  final String description;
+  final IconData icon;
+
+  const _LyricsProviderInfo({
+    required this.name,
+    required this.description,
+    required this.icon,
+  });
+}

lib/screens/setup_screen.dart

@@ -68,10 +68,12 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
 
   Future<void> _checkInitialPermissions() async {
     if (Platform.isIOS) {
+      final notificationStatus = await Permission.notification.status;
       if (mounted) {
         setState(() {
           _storagePermissionGranted = true;
-          _notificationPermissionGranted = true;
+          _notificationPermissionGranted =
+              notificationStatus.isGranted || notificationStatus.isProvisional;
         });
       }
     } else if (Platform.isAndroid) {
@@ -181,7 +183,14 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
   Future<void> _requestNotificationPermission() async {
     setState(() => _isLoading = true);
     try {
-      if (_androidSdkVersion >= 33) {
+      if (Platform.isIOS) {
+        final status = await Permission.notification.request();
+        if (status.isGranted || status.isProvisional) {
+          setState(() => _notificationPermissionGranted = true);
+        } else if (status.isPermanentlyDenied) {
+          await _showPermissionDeniedDialog('Notification');
+        }
+      } else if (_androidSdkVersion >= 33) {
         final status = await Permission.notification.request();
         if (status.isGranted) {
           setState(() => _notificationPermissionGranted = true);

lib/services/download_request_payload.dart

@@ -0,0 +1,154 @@
+class DownloadRequestPayload {
+  final String isrc;
+  final String service;
+  final String spotifyId;
+  final String trackName;
+  final String artistName;
+  final String albumName;
+  final String albumArtist;
+  final String coverUrl;
+  final String outputDir;
+  final String filenameFormat;
+  final String quality;
+  final bool embedLyrics;
+  final bool embedMaxQualityCover;
+  final int trackNumber;
+  final int discNumber;
+  final int totalTracks;
+  final String releaseDate;
+  final String itemId;
+  final int durationMs;
+  final String source;
+  final String genre;
+  final String label;
+  final String copyright;
+  final String tidalId;
+  final String qobuzId;
+  final String deezerId;
+  final String lyricsMode;
+  final bool useExtensions;
+  final bool useFallback;
+  final String storageMode;
+  final String safTreeUri;
+  final String safRelativeDir;
+  final String safFileName;
+  final String safOutputExt;
+
+  const DownloadRequestPayload({
+    this.isrc = '',
+    this.service = '',
+    this.spotifyId = '',
+    required this.trackName,
+    required this.artistName,
+    required this.albumName,
+    this.albumArtist = '',
+    this.coverUrl = '',
+    required this.outputDir,
+    required this.filenameFormat,
+    this.quality = 'LOSSLESS',
+    this.embedLyrics = true,
+    this.embedMaxQualityCover = true,
+    this.trackNumber = 1,
+    this.discNumber = 1,
+    this.totalTracks = 1,
+    this.releaseDate = '',
+    this.itemId = '',
+    this.durationMs = 0,
+    this.source = '',
+    this.genre = '',
+    this.label = '',
+    this.copyright = '',
+    this.tidalId = '',
+    this.qobuzId = '',
+    this.deezerId = '',
+    this.lyricsMode = 'embed',
+    this.useExtensions = false,
+    this.useFallback = false,
+    this.storageMode = 'app',
+    this.safTreeUri = '',
+    this.safRelativeDir = '',
+    this.safFileName = '',
+    this.safOutputExt = '',
+  });
+
+  Map<String, dynamic> toJson() {
+    return {
+      'isrc': isrc,
+      'service': service,
+      'spotify_id': spotifyId,
+      'track_name': trackName,
+      'artist_name': artistName,
+      'album_name': albumName,
+      'album_artist': albumArtist,
+      'cover_url': coverUrl,
+      'output_dir': outputDir,
+      'filename_format': filenameFormat,
+      'quality': quality,
+      'embed_lyrics': embedLyrics,
+      'embed_max_quality_cover': embedMaxQualityCover,
+      'track_number': trackNumber,
+      'disc_number': discNumber,
+      'total_tracks': totalTracks,
+      'release_date': releaseDate,
+      'item_id': itemId,
+      'duration_ms': durationMs,
+      'source': source,
+      'genre': genre,
+      'label': label,
+      'copyright': copyright,
+      'tidal_id': tidalId,
+      'qobuz_id': qobuzId,
+      'deezer_id': deezerId,
+      'lyrics_mode': lyricsMode,
+      'use_extensions': useExtensions,
+      'use_fallback': useFallback,
+      'storage_mode': storageMode,
+      'saf_tree_uri': safTreeUri,
+      'saf_relative_dir': safRelativeDir,
+      'saf_file_name': safFileName,
+      'saf_output_ext': safOutputExt,
+    };
+  }
+
+  DownloadRequestPayload withStrategy({
+    bool? useExtensions,
+    bool? useFallback,
+  }) {
+    return DownloadRequestPayload(
+      isrc: isrc,
+      service: service,
+      spotifyId: spotifyId,
+      trackName: trackName,
+      artistName: artistName,
+      albumName: albumName,
+      albumArtist: albumArtist,
+      coverUrl: coverUrl,
+      outputDir: outputDir,
+      filenameFormat: filenameFormat,
+      quality: quality,
+      embedLyrics: embedLyrics,
+      embedMaxQualityCover: embedMaxQualityCover,
+      trackNumber: trackNumber,
+      discNumber: discNumber,
+      totalTracks: totalTracks,
+      releaseDate: releaseDate,
+      itemId: itemId,
+      durationMs: durationMs,
+      source: source,
+      genre: genre,
+      label: label,
+      copyright: copyright,
+      tidalId: tidalId,
+      qobuzId: qobuzId,
+      deezerId: deezerId,
+      lyricsMode: lyricsMode,
+      useExtensions: useExtensions ?? this.useExtensions,
+      useFallback: useFallback ?? this.useFallback,
+      storageMode: storageMode,
+      safTreeUri: safTreeUri,
+      safRelativeDir: safRelativeDir,
+      safFileName: safFileName,
+      safOutputExt: safOutputExt,
+    );
+  }
+}

lib/services/downloaded_embedded_cover_resolver.dart

@@ -0,0 +1,220 @@
+import 'dart:collection';
+import 'dart:io';
+
+import 'package:flutter/widgets.dart';
+import 'package:spotiflac_android/services/platform_bridge.dart';
+import 'package:spotiflac_android/utils/file_access.dart';
+
+class _EmbeddedCoverCacheEntry {
+  final String previewPath;
+  final int? sourceModTimeMillis;
+
+  const _EmbeddedCoverCacheEntry({
+    required this.previewPath,
+    this.sourceModTimeMillis,
+  });
+}
+
+/// Shared resolver for embedded cover previews from downloaded/local files.
+/// It keeps a bounded in-memory cache and only refreshes extraction
+/// when the source file changed.
+class DownloadedEmbeddedCoverResolver {
+  static const int _maxCacheEntries = 180;
+
+  static final LinkedHashMap<String, _EmbeddedCoverCacheEntry> _cache =
+      LinkedHashMap<String, _EmbeddedCoverCacheEntry>();
+  static final Set<String> _pendingExtract = <String>{};
+  static final Set<String> _pendingRefresh = <String>{};
+  static final Set<String> _failedExtract = <String>{};
+
+  static String cleanFilePath(String? filePath) {
+    if (filePath == null) return '';
+    if (filePath.startsWith('EXISTS:')) {
+      return filePath.substring(7);
+    }
+    return filePath;
+  }
+
+  static Future<int?> readFileModTimeMillis(String? filePath) async {
+    final cleanPath = cleanFilePath(filePath);
+    if (cleanPath.isEmpty) return null;
+
+    if (isContentUri(cleanPath)) {
+      try {
+        final modTimes = await PlatformBridge.getSafFileModTimes([cleanPath]);
+        return modTimes[cleanPath];
+      } catch (_) {
+        return null;
+      }
+    }
+
+    try {
+      final stat = await File(cleanPath).stat();
+      return stat.modified.millisecondsSinceEpoch;
+    } catch (_) {
+      return null;
+    }
+  }
+
+  static String? resolve(String? filePath, {VoidCallback? onChanged}) {
+    final cleanPath = cleanFilePath(filePath);
+    if (cleanPath.isEmpty) return null;
+
+    if (_pendingRefresh.remove(cleanPath)) {
+      _ensureCover(cleanPath, forceRefresh: true, onChanged: onChanged);
+    }
+
+    final cached = _cache[cleanPath];
+    if (cached != null) {
+      if (File(cached.previewPath).existsSync()) {
+        _touch(cleanPath, cached);
+        return cached.previewPath;
+      }
+      _cache.remove(cleanPath);
+      _cleanupTempCoverPathSync(cached.previewPath);
+    }
+
+    return null;
+  }
+
+  static Future<void> scheduleRefreshForPath(
+    String? filePath, {
+    int? beforeModTime,
+    bool force = false,
+    VoidCallback? onChanged,
+  }) async {
+    final cleanPath = cleanFilePath(filePath);
+    if (cleanPath.isEmpty) return;
+
+    if (!force) {
+      if (beforeModTime == null) return;
+      final afterModTime = await readFileModTimeMillis(cleanPath);
+      if (afterModTime != null && afterModTime == beforeModTime) {
+        return;
+      }
+    }
+
+    _pendingRefresh.add(cleanPath);
+    _failedExtract.remove(cleanPath);
+    onChanged?.call();
+  }
+
+  static void invalidate(String? filePath) {
+    final cleanPath = cleanFilePath(filePath);
+    if (cleanPath.isEmpty) return;
+
+    final cached = _cache.remove(cleanPath);
+    _pendingExtract.remove(cleanPath);
+    _pendingRefresh.remove(cleanPath);
+    _failedExtract.remove(cleanPath);
+    if (cached != null) {
+      _cleanupTempCoverPathSync(cached.previewPath);
+    }
+  }
+
+  static void invalidatePathsNotIn(Set<String> validCleanPaths) {
+    if (validCleanPaths.isEmpty) {
+      final keys = _cache.keys.toList(growable: false);
+      for (final key in keys) {
+        invalidate(key);
+      }
+      return;
+    }
+
+    final staleKeys = _cache.keys
+        .where((path) => !validCleanPaths.contains(path))
+        .toList(growable: false);
+    for (final key in staleKeys) {
+      invalidate(key);
+    }
+  }
+
+  static void _touch(String cleanPath, _EmbeddedCoverCacheEntry entry) {
+    _cache
+      ..remove(cleanPath)
+      ..[cleanPath] = entry;
+  }
+
+  static void _trimCacheIfNeeded() {
+    while (_cache.length > _maxCacheEntries) {
+      final oldestKey = _cache.keys.first;
+      final removed = _cache.remove(oldestKey);
+      if (removed != null) {
+        _cleanupTempCoverPathSync(removed.previewPath);
+      }
+      _pendingExtract.remove(oldestKey);
+      _pendingRefresh.remove(oldestKey);
+      _failedExtract.remove(oldestKey);
+    }
+  }
+
+  static void _ensureCover(
+    String cleanPath, {
+    bool forceRefresh = false,
+    int? knownModTime,
+    VoidCallback? onChanged,
+  }) {
+    if (cleanPath.isEmpty) return;
+    if (_pendingExtract.contains(cleanPath)) return;
+    if (!forceRefresh && _cache.containsKey(cleanPath)) return;
+    if (!forceRefresh && _failedExtract.contains(cleanPath)) return;
+
+    _pendingExtract.add(cleanPath);
+    Future.microtask(() async {
+      String? outputPath;
+      try {
+        final modTime = knownModTime ?? await readFileModTimeMillis(cleanPath);
+        final tempDir = await Directory.systemTemp.createTemp(
+          'download_cover_preview_',
+        );
+        outputPath =
+            '${tempDir.path}${Platform.pathSeparator}cover_preview.jpg';
+        final result = await PlatformBridge.extractCoverToFile(
+          cleanPath,
+          outputPath,
+        );
+
+        final hasCover =
+            result['error'] == null && await File(outputPath).exists();
+        if (!hasCover) {
+          _failedExtract.add(cleanPath);
+          _cleanupTempCoverPathSync(outputPath);
+          return;
+        }
+
+        final previous = _cache[cleanPath];
+        final next = _EmbeddedCoverCacheEntry(
+          previewPath: outputPath,
+          sourceModTimeMillis: modTime,
+        );
+        _touch(cleanPath, next);
+        _failedExtract.remove(cleanPath);
+        _trimCacheIfNeeded();
+
+        if (previous != null && previous.previewPath != outputPath) {
+          _cleanupTempCoverPathSync(previous.previewPath);
+        }
+        onChanged?.call();
+      } catch (_) {
+        _failedExtract.add(cleanPath);
+        _cleanupTempCoverPathSync(outputPath);
+      } finally {
+        _pendingExtract.remove(cleanPath);
+      }
+    });
+  }
+
+  static void _cleanupTempCoverPathSync(String? coverPath) {
+    if (coverPath == null || coverPath.isEmpty) return;
+    try {
+      final file = File(coverPath);
+      if (file.existsSync()) {
+        file.deleteSync();
+      }
+      final parent = file.parent;
+      if (parent.existsSync()) {
+        parent.deleteSync(recursive: true);
+      }
+    } catch (_) {}
+  }
+}