chore: bump version to 2.0.6+36

- Fix duration showing incorrect values (ms to seconds conversion)
- Read audio quality from FLAC file instead of trusting API
- Add artist verification for Tidal/Qobuz/Amazon downloads
- Fix FLAC metadata case-insensitive replacement
- Fix settings navigation freeze on Android 14+ (PopScope handling)

.github/workflows/release.yml

@@ -45,6 +45,20 @@ jobs:
     needs: get-version
     
     steps:
+      - name: Free disk space
+        run: |
+          # Remove large unused tools (~15GB total)
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /opt/ghc
+          sudo rm -rf /opt/hostedtoolcache/CodeQL
+          sudo rm -rf /usr/local/share/boost
+          sudo rm -rf /usr/share/swift
+          sudo rm -rf /usr/local/.ghcup
+          # Clean docker images
+          sudo docker image prune --all --force
+          # Show available space
+          df -h
+
       - name: Checkout repository
         uses: actions/checkout@v4
 

CHANGELOG.md

@@ -1,5 +1,82 @@
 # Changelog
 
+## [2.0.6] - 2026-01-05
+
+### Fixed
+- **Duration Display Bug**: Fixed duration showing incorrect values like "4135:53" instead of "4:14"
+  - `duration_ms` (milliseconds) was being stored directly without conversion to seconds
+  - Now properly converts milliseconds to seconds before display
+- **Audio Quality from File**: Quality info (bit depth/sample rate) now read from actual FLAC file instead of trusting API
+  - More accurate quality display for all services (Tidal, Qobuz, Amazon)
+  - Also reads quality from existing files when skipping duplicates
+- **Artist Verification for Downloads**: Added artist name verification to prevent downloading wrong tracks
+  - Verifies artist matches between Spotify metadata and streaming service
+  - Handles different scripts (Japanese/Chinese vs Latin) as same artist with different transliteration
+  - Applied to Tidal, Qobuz, and Amazon downloads
+- **Metadata Case-Sensitivity**: Fixed FLAC metadata not being properly overwritten when downloaded file has lowercase tags
+  - Now uses case-insensitive comparison when replacing existing Vorbis comments
+  - Fixes issue where Amazon downloads could have duplicate metadata tags
+- **Settings Navigation Freeze**: Fixed app freezing when navigating back from settings sub-menus on some devices
+  - Added proper PopScope handling for predictive back gesture on Android 14+
+
+## [2.0.5] - 2026-01-05
+
+### Added
+- **Large Playlist Support**: Playlists with up to 1000 tracks are now fully fetched (was limited to 100)
+
+### Fixed
+- **Wrong Track Download**: Fixed issue where tracks with same ISRC but different versions (e.g., short/instrumental vs full version) would download the wrong track. Now verifies duration matches before downloading (30 second tolerance).
+
+## [2.0.4] - 2026-01-04
+
+### Fixed
+- **Android 11 Storage Permission**: Fixed "Permission denied" error on Android 11 (API 30) devices
+  - Added `MANAGE_EXTERNAL_STORAGE` permission for Android 11-12
+  - Shows explanation dialog before opening system settings
+
+## [2.0.3] - 2026-01-03
+
+### Added
+- **Custom Spotify API Credentials**: Set your own Spotify Client ID and Secret in Settings > Options to avoid rate limiting
+  - Toggle to enable/disable custom credentials without deleting them
+  - Material Expressive 3 bottom sheet UI for entering credentials
+- **Keyboard Dismiss on Scroll**: Keyboard now automatically dismisses when scrolling search results
+- **Rate Limit Error UI**: Shows friendly error card when API rate limit (429) is hit on Home, Artist, and Album screens
+
+### Changed
+- **Search on Enter Only**: Removed auto-search debounce, now only searches when pressing Enter key (saves API calls)
+
+### Fixed
+- **Download Cancel**: Fixed cancelled downloads still completing in background and appearing in history. Cancelled files are now properly deleted.
+- **Search Keyboard Dismiss**: Fixed keyboard randomly dismissing and navigating back when starting to search
+- **Back Button During Search**: Back button now properly dismisses keyboard first before clearing search
+- **Search Error Navigation**: Fixed pressing Enter during search (when loading or error) navigating back to home instead of staying on search screen
+- **Duplicate Search on Enter**: Enter key no longer triggers duplicate search if results already loaded
+
+## [2.0.2] - 2026-01-03
+
+### Added
+- **Actual Quality Display**: Shows real audio quality (bit depth/sample rate) after download
+  - Quality badge on download history items (e.g., "24-bit", "16-bit")
+  - Full quality info in Track Metadata screen (e.g., "24-bit/96kHz")
+  - Tertiary color highlight for Hi-Res (24-bit) downloads
+- **Quality Disclaimer**: Added note in quality picker explaining that actual quality depends on track availability
+- **Instant Lyrics Loading**: Lyrics now load from embedded file first (instant) before falling back to internet fetch
+
+### Fixed
+- **Fallback Service Display**: Fixed download history showing wrong service when fallback occurs (e.g., showing "TIDAL" when actually downloaded from "QOBUZ")
+- **Open in Spotify**: Fixed "Open in Spotify" button not opening Spotify app correctly
+
+### Removed
+- **Romaji Conversion**: Removed Japanese lyrics to romaji conversion feature (Kanji not supported, results were incomplete)
+
+### Technical
+- Go backend now returns `actual_bit_depth` and `actual_sample_rate` in download response
+- Go backend now returns `service` field indicating actual service used (important for fallback)
+- Tidal API v2 response provides exact quality info
+- Qobuz uses track metadata for quality info
+- Amazon now reads quality from downloaded FLAC file (previously returned unknown)
+
 ## [2.0.1] - 2026-01-03
 
 ### Added
@@ -9,12 +86,6 @@
   - Ripple effect follows rounded corners including drag handle
 
 ### Changed
-- **Update Dialog Redesign**: Material Expressive 3 style
-  - Icon header with container
-  - Version chips with "Current" and "New" labels
-  - Changelog in rounded card
-  - Download progress with percentage indicator
-  - Cleaner button layout
 - **Unified Progress Tracking System**: Deprecated legacy single-download progress
   - All downloads now use item-based progress tracking
   - Fixes duplicate notification bug when finalizing
@@ -23,6 +94,9 @@
 ### Fixed
 - **Duplicate Notification Bug**: Fixed issue where "Finalizing" and "Downloading" notifications appeared simultaneously
 - **Update Notification Stuck**: Fixed notification staying at 100% after download completes
+- **Quality Picker Consistency**: Unified quality picker UI across all screens (Home, Album, Playlist)
+  - Container with `primaryContainer` background for each option
+  - Distinct icons: music_note (Lossless), high_quality (Hi-Res), four_k (Max)
 
 ## [2.0.0] - 2026-01-03
 

README.md

@@ -11,17 +11,15 @@ Get Spotify tracks in true FLAC from Tidal, Qobuz & Amazon Music — no account
 
 </div>
 
-> **Active Development Notice**: This app is under heavy development. New builds may be pushed multiple times daily. If frequent update notifications are annoying, tap "Don't remind" when the update dialog appears, or disable update checks in Settings.
-
 ### [Download](https://github.com/zarzet/SpotiFLAC-Mobile/releases)
 
 ## Screenshots
 
 <p align="center">
-  <img src="assets/images/1.jpg" width="200" />
+  <img src="assets/images/1.jpg?v=2" width="200" />
-  <img src="assets/images/2.jpg" width="200" />
+  <img src="assets/images/2.jpg?v=2" width="200" />
-  <img src="assets/images/3.jpg" width="200" />
+  <img src="assets/images/3.jpg?v=2" width="200" />
-  <img src="assets/images/4.jpg" width="200" />
+  <img src="assets/images/4.jpg?v=2" width="200" />
 </p>
 
 ## Other project

android/app/src/main/AndroidManifest.xml

@@ -4,9 +4,11 @@
     <!-- Permissions -->
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" 
-        android:maxSdkVersion="28" />
+        android:maxSdkVersion="29" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" 
         android:maxSdkVersion="32" />
+    <!-- For Android 11+ (API 30-32) - full storage access -->
+    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />

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

@@ -157,8 +157,9 @@ class MainActivity: FlutterActivity() {
                             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 response = withContext(Dispatchers.IO) {
-                                Gobackend.getLyricsLRC(spotifyId, trackName, artistName)
+                                Gobackend.getLyricsLRC(spotifyId, trackName, artistName, filePath)
                             }
                             result.success(response)
                         }
@@ -199,6 +200,14 @@ class MainActivity: FlutterActivity() {
                         "isDownloadServiceRunning" -> {
                             result.success(DownloadService.isServiceRunning())
                         }
+                        "setSpotifyCredentials" -> {
+                            val clientId = call.argument<String>("client_id") ?: ""
+                            val clientSecret = call.argument<String>("client_secret") ?: ""
+                            withContext(Dispatchers.IO) {
+                                Gobackend.setSpotifyAPICredentials(clientId, clientSecret)
+                            }
+                            result.success(null)
+                        }
                         else -> result.notImplemented()
                     }
                 } catch (e: Exception) {

go_backend/amazon.go

@@ -36,6 +36,63 @@ type DoubleDoubleStatusResponse struct {
 	} `json:"current"`
 }
 
+// amazonArtistsMatch checks if the artist names are similar enough
+func amazonArtistsMatch(expectedArtist, foundArtist string) bool {
+	normExpected := strings.ToLower(strings.TrimSpace(expectedArtist))
+	normFound := strings.ToLower(strings.TrimSpace(foundArtist))
+	
+	// Exact match
+	if normExpected == normFound {
+		return true
+	}
+	
+	// Check if one contains the other
+	if strings.Contains(normExpected, normFound) || strings.Contains(normFound, normExpected) {
+		return true
+	}
+	
+	// Check first artist (before comma or feat)
+	expectedFirst := strings.Split(normExpected, ",")[0]
+	expectedFirst = strings.Split(expectedFirst, " feat")[0]
+	expectedFirst = strings.Split(expectedFirst, " ft.")[0]
+	expectedFirst = strings.TrimSpace(expectedFirst)
+	
+	foundFirst := strings.Split(normFound, ",")[0]
+	foundFirst = strings.Split(foundFirst, " feat")[0]
+	foundFirst = strings.Split(foundFirst, " ft.")[0]
+	foundFirst = strings.TrimSpace(foundFirst)
+	
+	if expectedFirst == foundFirst {
+		return true
+	}
+	
+	// Check if first artist is contained in the other
+	if strings.Contains(expectedFirst, foundFirst) || strings.Contains(foundFirst, expectedFirst) {
+		return true
+	}
+	
+	// If scripts are different (one is ASCII, one is non-ASCII like Japanese/Chinese/Korean),
+	// assume they're the same artist with different transliteration
+	expectedASCII := amazonIsASCIIString(expectedArtist)
+	foundASCII := amazonIsASCIIString(foundArtist)
+	if expectedASCII != foundASCII {
+		fmt.Printf("[Amazon] Artist names in different scripts, assuming match: '%s' vs '%s'\n", expectedArtist, foundArtist)
+		return true
+	}
+	
+	return false
+}
+
+// amazonIsASCIIString checks if a string contains only ASCII characters
+func amazonIsASCIIString(s string) bool {
+	for _, r := range s {
+		if r > 127 {
+			return false
+		}
+	}
+	return true
+}
+
 // NewAmazonDownloader creates a new Amazon downloader using DoubleDouble service
 func NewAmazonDownloader() *AmazonDownloader {
 	return &AmazonDownloader{
@@ -254,40 +311,56 @@ func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath, itemID string)
 	return nil
 }
 
+// AmazonDownloadResult contains download result with quality info
+type AmazonDownloadResult struct {
+	FilePath   string
+	BitDepth   int
+	SampleRate int
+}
+
 // downloadFromAmazon downloads a track using the request parameters
 // Uses DoubleDouble service (same as PC version)
-func downloadFromAmazon(req DownloadRequest) (string, error) {
+func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	downloader := NewAmazonDownloader()
 
 	// Check for existing file first
 	if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
-		return "EXISTS:" + existingFile, nil
+		return AmazonDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
 	}
 
 	// Get Amazon URL from SongLink
 	songlink := NewSongLinkClient()
 	availability, err := songlink.CheckTrackAvailability(req.SpotifyID, req.ISRC)
 	if err != nil {
-		return "", fmt.Errorf("failed to check Amazon availability via SongLink: %w", err)
+		return AmazonDownloadResult{}, fmt.Errorf("failed to check Amazon availability via SongLink: %w", err)
 	}
 
 	if !availability.Amazon || availability.AmazonURL == "" {
-		return "", fmt.Errorf("track not available on Amazon Music (SongLink returned no Amazon URL)")
+		return AmazonDownloadResult{}, fmt.Errorf("track not available on Amazon Music (SongLink returned no Amazon URL)")
 	}
 
 	// Create output directory if needed
 	if req.OutputDir != "." {
 		if err := os.MkdirAll(req.OutputDir, 0755); err != nil {
-			return "", fmt.Errorf("failed to create output directory: %w", err)
+			return AmazonDownloadResult{}, fmt.Errorf("failed to create output directory: %w", err)
 		}
 	}
 
 	// Download using DoubleDouble service (same as PC)
 	downloadURL, trackName, artistName, err := downloader.downloadFromDoubleDoubleService(availability.AmazonURL, req.OutputDir)
 	if err != nil {
-		return "", fmt.Errorf("failed to get download URL: %w", err)
+		return AmazonDownloadResult{}, fmt.Errorf("failed to get download URL: %w", err)
 	}
 
+	// Verify artist matches
+	if artistName != "" && !amazonArtistsMatch(req.ArtistName, artistName) {
+		fmt.Printf("[Amazon] Artist mismatch: expected '%s', got '%s'. Rejecting.\n", req.ArtistName, artistName)
+		return AmazonDownloadResult{}, fmt.Errorf("artist mismatch: expected '%s', got '%s'", req.ArtistName, artistName)
+	}
+
+	// Log match found
+	fmt.Printf("[Amazon] Match found: '%s' by '%s'\n", trackName, artistName)
+
 	// Build filename using Spotify metadata (more accurate)
 	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]interface{}{
 		"title":  req.TrackName,
@@ -302,12 +375,12 @@ func downloadFromAmazon(req DownloadRequest) (string, error) {
 
 	// Check if file already exists
 	if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
-		return "EXISTS:" + outputPath, nil
+		return AmazonDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
 	}
 
 	// Download file with item ID for progress tracking
 	if err := downloader.DownloadFile(downloadURL, outputPath, req.ItemID); err != nil {
-		return "", fmt.Errorf("download failed: %w", err)
+		return AmazonDownloadResult{}, fmt.Errorf("download failed: %w", err)
 	}
 
 	// Set progress to 100% and status to finalizing (before embedding)
@@ -363,17 +436,6 @@ func downloadFromAmazon(req DownloadRequest) (string, error) {
 			fmt.Println("[Amazon] No lyrics found for this track")
 		} else {
 			fmt.Printf("[Amazon] Lyrics found (%d lines), embedding...\n", len(lyrics.Lines))
-			
-			// Convert Japanese lyrics to romaji if enabled
-			if req.ConvertLyricsToRomaji {
-				for i := range lyrics.Lines {
-					if ContainsKana(lyrics.Lines[i].Words) {
-						lyrics.Lines[i].Words = ToRomaji(lyrics.Lines[i].Words)
-					}
-				}
-				fmt.Println("[Amazon] Converted Japanese lyrics to romaji")
-			}
-			
 			lrcContent := convertToLRC(lyrics)
 			if embedErr := EmbedLyrics(outputPath, lrcContent); embedErr != nil {
 				fmt.Printf("[Amazon] Warning: failed to embed lyrics: %v\n", embedErr)
@@ -384,5 +446,24 @@ func downloadFromAmazon(req DownloadRequest) (string, error) {
 	}
 
 	fmt.Println("[Amazon] ✓ Downloaded successfully from Amazon Music")
-	return outputPath, nil
+	
+	// Read actual quality from the downloaded FLAC file
+	// Amazon API doesn't provide quality info, but we can read it from the file itself
+	quality, err := GetAudioQuality(outputPath)
+	if err != nil {
+		fmt.Printf("[Amazon] Warning: couldn't read quality from file: %v\n", err)
+		// Return 0 to indicate unknown quality
+		return AmazonDownloadResult{
+			FilePath:   outputPath,
+			BitDepth:   0,
+			SampleRate: 0,
+		}, nil
+	}
+	
+	fmt.Printf("[Amazon] Actual quality: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
+	return AmazonDownloadResult{
+		FilePath:   outputPath,
+		BitDepth:   quality.BitDepth,
+		SampleRate: quality.SampleRate,
+	}, nil
 }

go_backend/exports.go

@@ -5,6 +5,7 @@ package gobackend
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"strings"
 	"time"
 )
@@ -30,6 +31,12 @@ func ParseSpotifyURL(url string) (string, error) {
 	return string(jsonBytes), nil
 }
 
+// SetSpotifyAPICredentials sets custom Spotify API credentials from Flutter
+// Pass empty strings to use default credentials
+func SetSpotifyAPICredentials(clientID, clientSecret string) {
+	SetSpotifyCredentials(clientID, clientSecret)
+}
+
 // GetSpotifyMetadata fetches metadata from Spotify URL
 // Returns JSON with track/album/playlist data
 func GetSpotifyMetadata(spotifyURL string) (string, error) {
@@ -122,12 +129,12 @@ type DownloadRequest struct {
 	Quality              string `json:"quality"` // LOSSLESS, HI_RES, HI_RES_LOSSLESS
 	EmbedLyrics          bool   `json:"embed_lyrics"`
 	EmbedMaxQualityCover bool   `json:"embed_max_quality_cover"`
-	ConvertLyricsToRomaji bool  `json:"convert_lyrics_to_romaji"`
 	TrackNumber          int    `json:"track_number"`
 	DiscNumber           int    `json:"disc_number"`
 	TotalTracks          int    `json:"total_tracks"`
 	ReleaseDate          string `json:"release_date"`
-	ItemID               string `json:"item_id"` // Unique ID for progress tracking
+	ItemID               string `json:"item_id"`    // Unique ID for progress tracking
+	DurationMS           int    `json:"duration_ms"` // Expected duration in milliseconds (for verification)
 }
 
 // DownloadResponse represents the result of a download
@@ -137,6 +144,17 @@ type DownloadResponse struct {
 	FilePath      string `json:"file_path,omitempty"`
 	Error         string `json:"error,omitempty"`
 	AlreadyExists bool   `json:"already_exists,omitempty"`
+	// Actual quality info from the source
+	ActualBitDepth   int    `json:"actual_bit_depth,omitempty"`
+	ActualSampleRate int    `json:"actual_sample_rate,omitempty"`
+	Service          string `json:"service,omitempty"` // Actual service used (for fallback)
+}
+
+// DownloadResult is a generic result type for all downloaders
+type DownloadResult struct {
+	FilePath   string
+	BitDepth   int
+	SampleRate int
 }
 
 // DownloadTrack downloads a track from the specified service
@@ -155,16 +173,40 @@ func DownloadTrack(requestJSON string) (string, error) {
 	req.AlbumArtist = strings.TrimSpace(req.AlbumArtist)
 	req.OutputDir = strings.TrimSpace(req.OutputDir)
 	
-	var filePath string
+	var result DownloadResult
 	var err error
 	
 	switch req.Service {
 	case "tidal":
-		filePath, err = downloadFromTidal(req)
+		tidalResult, tidalErr := downloadFromTidal(req)
+		if tidalErr == nil {
+			result = DownloadResult{
+				FilePath:   tidalResult.FilePath,
+				BitDepth:   tidalResult.BitDepth,
+				SampleRate: tidalResult.SampleRate,
+			}
+		}
+		err = tidalErr
 	case "qobuz":
-		filePath, err = downloadFromQobuz(req)
+		qobuzResult, qobuzErr := downloadFromQobuz(req)
+		if qobuzErr == nil {
+			result = DownloadResult{
+				FilePath:   qobuzResult.FilePath,
+				BitDepth:   qobuzResult.BitDepth,
+				SampleRate: qobuzResult.SampleRate,
+			}
+		}
+		err = qobuzErr
 	case "amazon":
-		filePath, err = downloadFromAmazon(req)
+		amazonResult, amazonErr := downloadFromAmazon(req)
+		if amazonErr == nil {
+			result = DownloadResult{
+				FilePath:   amazonResult.FilePath,
+				BitDepth:   amazonResult.BitDepth,
+				SampleRate: amazonResult.SampleRate,
+			}
+		}
+		err = amazonErr
 	default:
 		return errorResponse("Unknown service: " + req.Service)
 	}
@@ -174,21 +216,44 @@ func DownloadTrack(requestJSON string) (string, error) {
 	}
 	
 	// Check if file already exists
-	if len(filePath) > 7 && filePath[:7] == "EXISTS:" {
+	if len(result.FilePath) > 7 && result.FilePath[:7] == "EXISTS:" {
+		actualPath := result.FilePath[7:]
+		// Read actual quality from existing file
+		quality, qErr := GetAudioQuality(actualPath)
+		if qErr == nil {
+			result.BitDepth = quality.BitDepth
+			result.SampleRate = quality.SampleRate
+		}
 		resp := DownloadResponse{
-			Success:       true,
+			Success:          true,
-			Message:       "File already exists",
+			Message:          "File already exists",
-			FilePath:      filePath[7:],
+			FilePath:         actualPath,
-			AlreadyExists: true,
+			AlreadyExists:    true,
+			ActualBitDepth:   result.BitDepth,
+			ActualSampleRate: result.SampleRate,
+			Service:          req.Service,
 		}
 		jsonBytes, _ := json.Marshal(resp)
 		return string(jsonBytes), nil
 	}
 	
+	// Read actual quality from downloaded file (more accurate than API)
+	quality, qErr := GetAudioQuality(result.FilePath)
+	if qErr == nil {
+		result.BitDepth = quality.BitDepth
+		result.SampleRate = quality.SampleRate
+		fmt.Printf("[Download] Actual quality from file: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
+	} else {
+		fmt.Printf("[Download] Could not read quality from file: %v\n", qErr)
+	}
+	
 	resp := DownloadResponse{
-		Success:  true,
+		Success:          true,
-		Message:  "Download complete",
+		Message:          "Download complete",
-		FilePath: filePath,
+		FilePath:         result.FilePath,
+		ActualBitDepth:   result.BitDepth,
+		ActualSampleRate: result.SampleRate,
+		Service:          req.Service,
 	}
 	
 	jsonBytes, _ := json.Marshal(resp)
@@ -230,35 +295,82 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 	for _, service := range services {
 		req.Service = service
 		
-		var filePath string
+		var result DownloadResult
 		var err error
 		
 		switch service {
 		case "tidal":
-			filePath, err = downloadFromTidal(req)
+			tidalResult, tidalErr := downloadFromTidal(req)
+			if tidalErr == nil {
+				result = DownloadResult{
+					FilePath:   tidalResult.FilePath,
+					BitDepth:   tidalResult.BitDepth,
+					SampleRate: tidalResult.SampleRate,
+				}
+			}
+			err = tidalErr
 		case "qobuz":
-			filePath, err = downloadFromQobuz(req)
+			qobuzResult, qobuzErr := downloadFromQobuz(req)
+			if qobuzErr == nil {
+				result = DownloadResult{
+					FilePath:   qobuzResult.FilePath,
+					BitDepth:   qobuzResult.BitDepth,
+					SampleRate: qobuzResult.SampleRate,
+				}
+			}
+			err = qobuzErr
 		case "amazon":
-			filePath, err = downloadFromAmazon(req)
+			amazonResult, amazonErr := downloadFromAmazon(req)
+			if amazonErr == nil {
+				result = DownloadResult{
+					FilePath:   amazonResult.FilePath,
+					BitDepth:   amazonResult.BitDepth,
+					SampleRate: amazonResult.SampleRate,
+				}
+			}
+			err = amazonErr
 		}
 		
 		if err == nil {
 			// Check if file already exists
-			if len(filePath) > 7 && filePath[:7] == "EXISTS:" {
+			if len(result.FilePath) > 7 && result.FilePath[:7] == "EXISTS:" {
+				actualPath := result.FilePath[7:]
+				// Read actual quality from existing file
+				quality, qErr := GetAudioQuality(actualPath)
+				if qErr == nil {
+					result.BitDepth = quality.BitDepth
+					result.SampleRate = quality.SampleRate
+				}
 				resp := DownloadResponse{
-					Success:       true,
+					Success:          true,
-					Message:       "File already exists",
+					Message:          "File already exists",
-					FilePath:      filePath[7:],
+					FilePath:         actualPath,
-					AlreadyExists: true,
+					AlreadyExists:    true,
+					ActualBitDepth:   result.BitDepth,
+					ActualSampleRate: result.SampleRate,
+					Service:          service,
 				}
 				jsonBytes, _ := json.Marshal(resp)
 				return string(jsonBytes), nil
 			}
 			
+			// Read actual quality from downloaded file (more accurate than API)
+			quality, qErr := GetAudioQuality(result.FilePath)
+			if qErr == nil {
+				result.BitDepth = quality.BitDepth
+				result.SampleRate = quality.SampleRate
+				fmt.Printf("[Download] Actual quality from file: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
+			} else {
+				fmt.Printf("[Download] Could not read quality from file: %v\n", qErr)
+			}
+			
 			resp := DownloadResponse{
-				Success:  true,
+				Success:          true,
-				Message:  "Downloaded from " + service,
+				Message:          "Downloaded from " + service,
-				FilePath: filePath,
+				FilePath:         result.FilePath,
+				ActualBitDepth:   result.BitDepth,
+				ActualSampleRate: result.SampleRate,
+				Service:          service,
 			}
 			jsonBytes, _ := json.Marshal(resp)
 			return string(jsonBytes), nil
@@ -367,14 +479,24 @@ func FetchLyrics(spotifyID, trackName, artistName string) (string, error) {
 }
 
 // GetLyricsLRC fetches lyrics and converts to LRC format string
-func GetLyricsLRC(spotifyID, trackName, artistName string) (string, error) {
+// First tries to extract from file, then falls back to fetching from internet
+func GetLyricsLRC(spotifyID, trackName, artistName string, filePath string) (string, error) {
+	// Try to extract from file first (much faster)
+	if filePath != "" {
+		lyrics, err := ExtractLyrics(filePath)
+		if err == nil && lyrics != "" {
+			return lyrics, nil
+		}
+	}
+
+	// Fallback to fetching from internet
 	client := NewLyricsClient()
-	lyrics, err := client.FetchLyricsAllSources(spotifyID, trackName, artistName)
+	lyricsData, err := client.FetchLyricsAllSources(spotifyID, trackName, artistName)
 	if err != nil {
 		return "", err
 	}
 
-	lrcContent := convertToLRC(lyrics)
+	lrcContent := convertToLRC(lyricsData)
 	return lrcContent, nil
 }
 
@@ -394,12 +516,6 @@ func EmbedLyricsToFile(filePath, lyrics string) (string, error) {
 	return string(jsonBytes), nil
 }
 
-// ConvertToRomaji converts Japanese kana (Hiragana/Katakana) to romaji
-// Kanji characters are preserved as-is
-func ConvertToRomaji(text string) string {
-	return ToRomaji(text)
-}
-
 func errorResponse(msg string) (string, error) {
 	resp := DownloadResponse{
 		Success: false,

go_backend/metadata.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"strconv"
+	"strings"
 
 	"github.com/go-flac/flacpicture"
 	"github.com/go-flac/flacvorbis"
@@ -273,10 +274,16 @@ func setComment(cmt *flacvorbis.MetaDataBlockVorbisComment, key, value string) {
 	if value == "" {
 		return
 	}
-	// Remove existing
+	// Remove existing (case-insensitive comparison for Vorbis comments)
+	keyUpper := strings.ToUpper(key)
 	for i := len(cmt.Comments) - 1; i >= 0; i-- {
-		if len(cmt.Comments[i]) > len(key)+1 && cmt.Comments[i][:len(key)+1] == key+"=" {
+		comment := cmt.Comments[i]
-			cmt.Comments = append(cmt.Comments[:i], cmt.Comments[i+1:]...)
+		eqIdx := strings.Index(comment, "=")
+		if eqIdx > 0 {
+			existingKey := strings.ToUpper(comment[:eqIdx])
+			if existingKey == keyUpper {
+				cmt.Comments = append(cmt.Comments[:i], cmt.Comments[i+1:]...)
+			}
 		}
 	}
 	// Add new
@@ -335,3 +342,92 @@ func EmbedLyrics(filePath string, lyrics string) error {
 
 	return f.Save(filePath)
 }
+
+// ExtractLyrics extracts embedded lyrics from a FLAC file
+func ExtractLyrics(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
+			}
+			
+			// Try LYRICS tag first
+			lyrics, err := cmt.Get("LYRICS")
+			if err == nil && len(lyrics) > 0 && lyrics[0] != "" {
+				return lyrics[0], nil
+			}
+			
+			// Fallback to UNSYNCEDLYRICS
+			lyrics, err = cmt.Get("UNSYNCEDLYRICS")
+			if err == nil && len(lyrics) > 0 && lyrics[0] != "" {
+				return lyrics[0], nil
+			}
+		}
+	}
+
+	return "", fmt.Errorf("no lyrics found in file")
+}
+
+// AudioQuality represents audio quality info from a FLAC file
+type AudioQuality struct {
+	BitDepth   int `json:"bit_depth"`
+	SampleRate int `json:"sample_rate"`
+}
+
+// GetAudioQuality reads bit depth and sample rate from a FLAC file's StreamInfo block
+// FLAC StreamInfo is always the first metadata block after the 4-byte "fLaC" marker
+func GetAudioQuality(filePath string) (AudioQuality, error) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return AudioQuality{}, fmt.Errorf("failed to open file: %w", err)
+	}
+	defer file.Close()
+
+	// Read FLAC marker (4 bytes: "fLaC")
+	marker := make([]byte, 4)
+	if _, err := file.Read(marker); err != nil {
+		return AudioQuality{}, fmt.Errorf("failed to read marker: %w", err)
+	}
+	if string(marker) != "fLaC" {
+		return AudioQuality{}, fmt.Errorf("not a FLAC file")
+	}
+
+	// Read metadata block header (4 bytes)
+	// Byte 0: bit 7 = last block flag, bits 0-6 = block type (0 = STREAMINFO)
+	// Bytes 1-3: block length (24-bit big-endian)
+	header := make([]byte, 4)
+	if _, err := file.Read(header); err != nil {
+		return AudioQuality{}, fmt.Errorf("failed to read header: %w", err)
+	}
+
+	blockType := header[0] & 0x7F
+	if blockType != 0 {
+		return AudioQuality{}, fmt.Errorf("first block is not STREAMINFO")
+	}
+
+	// Read STREAMINFO block (34 bytes minimum)
+	// Bytes 10-13 contain sample rate (20 bits), channels (3 bits), bits per sample (5 bits)
+	streamInfo := make([]byte, 34)
+	if _, err := file.Read(streamInfo); err != nil {
+		return AudioQuality{}, fmt.Errorf("failed to read STREAMINFO: %w", err)
+	}
+
+	// Parse sample rate (20 bits starting at byte 10)
+	// Bytes 10-12: [SSSS SSSS] [SSSS SSSS] [SSSS CCCC] where S=sample rate, C=channels
+	sampleRate := (int(streamInfo[10]) << 12) | (int(streamInfo[11]) << 4) | (int(streamInfo[12]) >> 4)
+
+	// Parse bits per sample (5 bits)
+	// Byte 12 bits 0-3 and byte 13 bit 7: [.... BBBB] [B...] where B=bits per sample - 1
+	bitsPerSample := ((int(streamInfo[12]) & 0x01) << 4) | (int(streamInfo[13]) >> 4) + 1
+
+	return AudioQuality{
+		BitDepth:   bitsPerSample,
+		SampleRate: sampleRate,
+	}, nil
+}

go_backend/qobuz.go

@@ -9,6 +9,7 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"strings"
 )
 
 // QobuzDownloader handles Qobuz downloads
@@ -39,6 +40,63 @@ type QobuzTrack struct {
 	} `json:"performer"`
 }
 
+// qobuzArtistsMatch checks if the artist names are similar enough
+func qobuzArtistsMatch(expectedArtist, foundArtist string) bool {
+	normExpected := strings.ToLower(strings.TrimSpace(expectedArtist))
+	normFound := strings.ToLower(strings.TrimSpace(foundArtist))
+	
+	// Exact match
+	if normExpected == normFound {
+		return true
+	}
+	
+	// Check if one contains the other
+	if strings.Contains(normExpected, normFound) || strings.Contains(normFound, normExpected) {
+		return true
+	}
+	
+	// Check first artist (before comma or feat)
+	expectedFirst := strings.Split(normExpected, ",")[0]
+	expectedFirst = strings.Split(expectedFirst, " feat")[0]
+	expectedFirst = strings.Split(expectedFirst, " ft.")[0]
+	expectedFirst = strings.TrimSpace(expectedFirst)
+	
+	foundFirst := strings.Split(normFound, ",")[0]
+	foundFirst = strings.Split(foundFirst, " feat")[0]
+	foundFirst = strings.Split(foundFirst, " ft.")[0]
+	foundFirst = strings.TrimSpace(foundFirst)
+	
+	if expectedFirst == foundFirst {
+		return true
+	}
+	
+	// Check if first artist is contained in the other
+	if strings.Contains(expectedFirst, foundFirst) || strings.Contains(foundFirst, expectedFirst) {
+		return true
+	}
+	
+	// If scripts are different (one is ASCII, one is non-ASCII like Japanese/Chinese/Korean),
+	// assume they're the same artist with different transliteration
+	expectedASCII := qobuzIsASCIIString(expectedArtist)
+	foundASCII := qobuzIsASCIIString(foundArtist)
+	if expectedASCII != foundASCII {
+		fmt.Printf("[Qobuz] Artist names in different scripts, assuming match: '%s' vs '%s'\n", expectedArtist, foundArtist)
+		return true
+	}
+	
+	return false
+}
+
+// qobuzIsASCIIString checks if a string contains only ASCII characters
+func qobuzIsASCIIString(s string) bool {
+	for _, r := range s {
+		if r > 127 {
+			return false
+		}
+	}
+	return true
+}
+
 // NewQobuzDownloader creates a new Qobuz downloader
 func NewQobuzDownloader() *QobuzDownloader {
 	return &QobuzDownloader{
@@ -112,8 +170,96 @@ func (q *QobuzDownloader) SearchTrackByISRC(isrc string) (*QobuzTrack, error) {
 	return nil, fmt.Errorf("no exact ISRC match found for: %s", isrc)
 }
 
+// SearchTrackByISRCWithTitle searches for a track by ISRC with duration verification
+// expectedDurationSec is the expected duration in seconds (0 to skip verification)
+func (q *QobuzDownloader) SearchTrackByISRCWithDuration(isrc string, expectedDurationSec int) (*QobuzTrack, error) {
+	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly93d3cucW9idXouY29tL2FwaS5qc29uLzAuMi90cmFjay9zZWFyY2g/cXVlcnk9")
+	searchURL := fmt.Sprintf("%s%s&limit=50&app_id=%s", string(apiBase), url.QueryEscape(isrc), q.appID)
+
+	req, err := http.NewRequest("GET", searchURL, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := DoRequestWithUserAgent(q.client, req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("search failed: HTTP %d", resp.StatusCode)
+	}
+
+	var result struct {
+		Tracks struct {
+			Items []QobuzTrack `json:"items"`
+		} `json:"tracks"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return nil, err
+	}
+
+	// Find ISRC matches
+	var isrcMatches []*QobuzTrack
+	for i := range result.Tracks.Items {
+		if result.Tracks.Items[i].ISRC == isrc {
+			isrcMatches = append(isrcMatches, &result.Tracks.Items[i])
+		}
+	}
+
+	if len(isrcMatches) > 0 {
+		// Verify duration if provided
+		if expectedDurationSec > 0 {
+			var durationVerifiedMatches []*QobuzTrack
+			for _, track := range isrcMatches {
+				durationDiff := track.Duration - expectedDurationSec
+				if durationDiff < 0 {
+					durationDiff = -durationDiff
+				}
+				// Allow 30 seconds tolerance
+				if durationDiff <= 30 {
+					durationVerifiedMatches = append(durationVerifiedMatches, track)
+				}
+			}
+			
+			if len(durationVerifiedMatches) > 0 {
+				fmt.Printf("[Qobuz] ISRC match with duration verification: '%s' (expected %ds, found %ds)\n", 
+					durationVerifiedMatches[0].Title, expectedDurationSec, durationVerifiedMatches[0].Duration)
+				return durationVerifiedMatches[0], nil
+			}
+			
+			// ISRC matches but duration doesn't
+			fmt.Printf("[Qobuz] WARNING: ISRC %s found but duration mismatch. Expected=%ds, Found=%ds. Rejecting.\n", 
+				isrc, expectedDurationSec, isrcMatches[0].Duration)
+			return nil, fmt.Errorf("ISRC found but duration mismatch: expected %ds, found %ds (likely different version)", 
+				expectedDurationSec, isrcMatches[0].Duration)
+		}
+		
+		// No duration to verify, return first match
+		fmt.Printf("[Qobuz] ISRC match (no duration verification): '%s'\n", isrcMatches[0].Title)
+		return isrcMatches[0], nil
+	}
+
+	if len(result.Tracks.Items) == 0 {
+		return nil, fmt.Errorf("no tracks found for ISRC: %s", isrc)
+	}
+
+	return nil, fmt.Errorf("no exact ISRC match found for: %s", isrc)
+}
+
+// SearchTrackByISRCWithTitle is deprecated, use SearchTrackByISRCWithDuration instead
+func (q *QobuzDownloader) SearchTrackByISRCWithTitle(isrc, expectedTitle string) (*QobuzTrack, error) {
+	return q.SearchTrackByISRCWithDuration(isrc, 0)
+}
+
 // SearchTrackByMetadata searches for a track using artist name and track name
 func (q *QobuzDownloader) SearchTrackByMetadata(trackName, artistName string) (*QobuzTrack, error) {
+	return q.SearchTrackByMetadataWithDuration(trackName, artistName, 0)
+}
+
+// SearchTrackByMetadataWithDuration searches for a track with duration verification
+func (q *QobuzDownloader) SearchTrackByMetadataWithDuration(trackName, artistName string, expectedDurationSec int) (*QobuzTrack, error) {
 	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly93d3cucW9idXouY29tL2FwaS5qc29uLzAuMi90cmFjay9zZWFyY2g/cXVlcnk9")
 
 	// Try multiple search strategies
@@ -129,6 +275,8 @@ func (q *QobuzDownloader) SearchTrackByMetadata(trackName, artistName string) (*
 		queries = append(queries, trackName)
 	}
 
+	var allTracks []QobuzTrack
+
 	for _, query := range queries {
 		searchURL := fmt.Sprintf("%s%s&limit=50&app_id=%s", string(apiBase), url.QueryEscape(query), q.appID)
 
@@ -159,19 +307,50 @@ func (q *QobuzDownloader) SearchTrackByMetadata(trackName, artistName string) (*
 		resp.Body.Close()
 
 		if len(result.Tracks.Items) > 0 {
-			// Return first result with best quality
+			allTracks = append(allTracks, result.Tracks.Items...)
-			for i := range result.Tracks.Items {
+		}
-				track := &result.Tracks.Items[i]
+	}
+
+	if len(allTracks) == 0 {
+		return nil, fmt.Errorf("no tracks found for: %s - %s", artistName, trackName)
+	}
+
+	// If duration verification is requested
+	if expectedDurationSec > 0 {
+		var durationMatches []*QobuzTrack
+		for i := range allTracks {
+			track := &allTracks[i]
+			durationDiff := track.Duration - expectedDurationSec
+			if durationDiff < 0 {
+				durationDiff = -durationDiff
+			}
+			if durationDiff <= 30 {
+				durationMatches = append(durationMatches, track)
+			}
+		}
+
+		if len(durationMatches) > 0 {
+			// Return best quality among duration matches
+			for _, track := range durationMatches {
 				if track.MaximumBitDepth >= 24 {
 					return track, nil
 				}
 			}
-			// Return first result if no hi-res found
+			return durationMatches[0], nil
-			return &result.Tracks.Items[0], nil
 		}
+
+		// No duration match found
+		return nil, fmt.Errorf("no tracks found with matching duration (expected %ds)", expectedDurationSec)
 	}
 
-	return nil, fmt.Errorf("no tracks found for: %s - %s", artistName, trackName)
+	// No duration verification, return best quality
+	for i := range allTracks {
+		track := &allTracks[i]
+		if track.MaximumBitDepth >= 24 {
+			return track, nil
+		}
+	}
+	return &allTracks[0], nil
 }
 
 // getQobuzDownloadURLSequential requests download URL from APIs sequentially
@@ -305,36 +484,61 @@ func (q *QobuzDownloader) DownloadFile(downloadURL, outputPath, itemID string) e
 	return err
 }
 
+// QobuzDownloadResult contains download result with quality info
+type QobuzDownloadResult struct {
+	FilePath   string
+	BitDepth   int
+	SampleRate int
+}
+
 // downloadFromQobuz downloads a track using the request parameters
-func downloadFromQobuz(req DownloadRequest) (string, error) {
+func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 	downloader := NewQobuzDownloader()
 
 	// Check for existing file first
 	if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
-		return "EXISTS:" + existingFile, nil
+		return QobuzDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
 	}
 
+	// Convert expected duration from ms to seconds
+	expectedDurationSec := req.DurationMS / 1000
+
 	var track *QobuzTrack
 	var err error
 
-	// Strategy 1: Search by ISRC
+	// Strategy 1: Search by ISRC with duration verification
 	if req.ISRC != "" {
-		track, err = downloader.SearchTrackByISRC(req.ISRC)
+		track, err = downloader.SearchTrackByISRCWithDuration(req.ISRC, expectedDurationSec)
+		// Verify artist
+		if track != nil && !qobuzArtistsMatch(req.ArtistName, track.Performer.Name) {
+			fmt.Printf("[Qobuz] Artist mismatch from ISRC search: expected '%s', got '%s'. Rejecting.\n", 
+				req.ArtistName, track.Performer.Name)
+			track = nil
+		}
 	}
 
-	// Strategy 2: Search by metadata
+	// Strategy 2: Search by metadata with duration verification
 	if track == nil {
-		track, err = downloader.SearchTrackByMetadata(req.TrackName, req.ArtistName)
+		track, err = downloader.SearchTrackByMetadataWithDuration(req.TrackName, req.ArtistName, expectedDurationSec)
+		// Verify artist
+		if track != nil && !qobuzArtistsMatch(req.ArtistName, track.Performer.Name) {
+			fmt.Printf("[Qobuz] Artist mismatch from metadata search: expected '%s', got '%s'. Rejecting.\n", 
+				req.ArtistName, track.Performer.Name)
+			track = nil
+		}
 	}
 
 	if track == nil {
-		errMsg := "could not find track on Qobuz"
+		errMsg := "could not find matching track on Qobuz (artist/duration mismatch)"
 		if err != nil {
 			errMsg = err.Error()
 		}
-		return "", fmt.Errorf("qobuz search failed: %s", errMsg)
+		return QobuzDownloadResult{}, fmt.Errorf("qobuz search failed: %s", errMsg)
 	}
 
+	// Log match found
+	fmt.Printf("[Qobuz] Match found: '%s' by '%s' (duration: %ds)\n", track.Title, track.Performer.Name, track.Duration)
+
 	// Build filename
 	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]interface{}{
 		"title":  req.TrackName,
@@ -349,7 +553,7 @@ func downloadFromQobuz(req DownloadRequest) (string, error) {
 
 	// Check if file already exists
 	if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
-		return "EXISTS:" + outputPath, nil
+		return QobuzDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
 	}
 
 	// Map quality from Tidal format to Qobuz format
@@ -366,15 +570,20 @@ func downloadFromQobuz(req DownloadRequest) (string, error) {
 	}
 	fmt.Printf("[Qobuz] Using quality: %s (mapped from %s)\n", qobuzQuality, req.Quality)
 
+	// Get actual quality from track metadata
+	actualBitDepth := track.MaximumBitDepth
+	actualSampleRate := int(track.MaximumSamplingRate * 1000) // Convert kHz to Hz
+	fmt.Printf("[Qobuz] Actual quality: %d-bit/%.1fkHz\n", actualBitDepth, track.MaximumSamplingRate)
+
 	// Get download URL using parallel API requests
 	downloadURL, err := downloader.GetDownloadURL(track.ID, qobuzQuality)
 	if err != nil {
-		return "", fmt.Errorf("failed to get download URL: %w", err)
+		return QobuzDownloadResult{}, fmt.Errorf("failed to get download URL: %w", err)
 	}
 
 	// Download file with item ID for progress tracking
 	if err := downloader.DownloadFile(downloadURL, outputPath, req.ItemID); err != nil {
-		return "", fmt.Errorf("download failed: %w", err)
+		return QobuzDownloadResult{}, fmt.Errorf("download failed: %w", err)
 	}
 
 	// Set progress to 100% and status to finalizing (before embedding)
@@ -425,17 +634,6 @@ func downloadFromQobuz(req DownloadRequest) (string, error) {
 			fmt.Println("[Qobuz] No lyrics found for this track")
 		} else {
 			fmt.Printf("[Qobuz] Lyrics found (%d lines), embedding...\n", len(lyrics.Lines))
-			
-			// Convert Japanese lyrics to romaji if enabled
-			if req.ConvertLyricsToRomaji {
-				for i := range lyrics.Lines {
-					if ContainsKana(lyrics.Lines[i].Words) {
-						lyrics.Lines[i].Words = ToRomaji(lyrics.Lines[i].Words)
-					}
-				}
-				fmt.Println("[Qobuz] Converted Japanese lyrics to romaji")
-			}
-			
 			lrcContent := convertToLRC(lyrics)
 			if embedErr := EmbedLyrics(outputPath, lrcContent); embedErr != nil {
 				fmt.Printf("[Qobuz] Warning: failed to embed lyrics: %v\n", embedErr)
@@ -445,5 +643,9 @@ func downloadFromQobuz(req DownloadRequest) (string, error) {
 		}
 	}
 
-	return outputPath, nil
+	return QobuzDownloadResult{
+		FilePath:   outputPath,
+		BitDepth:   actualBitDepth,
+		SampleRate: actualSampleRate,
+	}, nil
 }

go_backend/romaji.go

@@ -1,276 +0,0 @@
-package gobackend
-
-import (
-	"strings"
-	"unicode"
-)
-
-// Japanese character ranges
-const (
-	hiraganaStart = 0x3040
-	hiraganaEnd   = 0x309F
-	katakanaStart = 0x30A0
-	katakanaEnd   = 0x30FF
-	kanjiStart    = 0x4E00
-	kanjiEnd      = 0x9FFF
-)
-
-// hiraganaToRomaji maps hiragana characters to romaji
-var hiraganaToRomaji = map[rune]string{
-	// Basic vowels
-	'あ': "a", 'い': "i", 'う': "u", 'え': "e", 'お': "o",
-	// K-row
-	'か': "ka", 'き': "ki", 'く': "ku", 'け': "ke", 'こ': "ko",
-	// S-row
-	'さ': "sa", 'し': "shi", 'す': "su", 'せ': "se", 'そ': "so",
-	// T-row
-	'た': "ta", 'ち': "chi", 'つ': "tsu", 'て': "te", 'と': "to",
-	// N-row
-	'な': "na", 'に': "ni", 'ぬ': "nu", 'ね': "ne", 'の': "no",
-	// H-row
-	'は': "ha", 'ひ': "hi", 'ふ': "fu", 'へ': "he", 'ほ': "ho",
-	// M-row
-	'ま': "ma", 'み': "mi", 'む': "mu", 'め': "me", 'も': "mo",
-	// Y-row
-	'や': "ya", 'ゆ': "yu", 'よ': "yo",
-	// R-row
-	'ら': "ra", 'り': "ri", 'る': "ru", 'れ': "re", 'ろ': "ro",
-	// W-row
-	'わ': "wa", 'を': "wo",
-	// N
-	'ん': "n",
-	// Voiced (dakuten) - G-row
-	'が': "ga", 'ぎ': "gi", 'ぐ': "gu", 'げ': "ge", 'ご': "go",
-	// Z-row
-	'ざ': "za", 'じ': "ji", 'ず': "zu", 'ぜ': "ze", 'ぞ': "zo",
-	// D-row
-	'だ': "da", 'ぢ': "ji", 'づ': "zu", 'で': "de", 'ど': "do",
-	// B-row
-	'ば': "ba", 'び': "bi", 'ぶ': "bu", 'べ': "be", 'ぼ': "bo",
-	// P-row (handakuten)
-	'ぱ': "pa", 'ぴ': "pi", 'ぷ': "pu", 'ぺ': "pe", 'ぽ': "po",
-	// Small characters
-	'ゃ': "ya", 'ゅ': "yu", 'ょ': "yo",
-	'ぁ': "a", 'ぃ': "i", 'ぅ': "u", 'ぇ': "e", 'ぉ': "o",
-	'っ': "", // Small tsu - handled specially
-	// Long vowel mark
-	'ー': "",
-}
-
-// katakanaToRomaji maps katakana characters to romaji
-var katakanaToRomaji = map[rune]string{
-	// Basic vowels
-	'ア': "a", 'イ': "i", 'ウ': "u", 'エ': "e", 'オ': "o",
-	// K-row
-	'カ': "ka", 'キ': "ki", 'ク': "ku", 'ケ': "ke", 'コ': "ko",
-	// S-row
-	'サ': "sa", 'シ': "shi", 'ス': "su", 'セ': "se", 'ソ': "so",
-	// T-row
-	'タ': "ta", 'チ': "chi", 'ツ': "tsu", 'テ': "te", 'ト': "to",
-	// N-row
-	'ナ': "na", 'ニ': "ni", 'ヌ': "nu", 'ネ': "ne", 'ノ': "no",
-	// H-row
-	'ハ': "ha", 'ヒ': "hi", 'フ': "fu", 'ヘ': "he", 'ホ': "ho",
-	// M-row
-	'マ': "ma", 'ミ': "mi", 'ム': "mu", 'メ': "me", 'モ': "mo",
-	// Y-row
-	'ヤ': "ya", 'ユ': "yu", 'ヨ': "yo",
-	// R-row
-	'ラ': "ra", 'リ': "ri", 'ル': "ru", 'レ': "re", 'ロ': "ro",
-	// W-row
-	'ワ': "wa", 'ヲ': "wo",
-	// N
-	'ン': "n",
-	// Voiced (dakuten) - G-row
-	'ガ': "ga", 'ギ': "gi", 'グ': "gu", 'ゲ': "ge", 'ゴ': "go",
-	// Z-row
-	'ザ': "za", 'ジ': "ji", 'ズ': "zu", 'ゼ': "ze", 'ゾ': "zo",
-	// D-row
-	'ダ': "da", 'ヂ': "ji", 'ヅ': "zu", 'デ': "de", 'ド': "do",
-	// B-row
-	'バ': "ba", 'ビ': "bi", 'ブ': "bu", 'ベ': "be", 'ボ': "bo",
-	// P-row (handakuten)
-	'パ': "pa", 'ピ': "pi", 'プ': "pu", 'ペ': "pe", 'ポ': "po",
-	// Small characters
-	'ャ': "ya", 'ュ': "yu", 'ョ': "yo",
-	'ァ': "a", 'ィ': "i", 'ゥ': "u", 'ェ': "e", 'ォ': "o",
-	'ッ': "", // Small tsu - handled specially
-	// Extended katakana
-	'ヴ': "vu",
-	// Long vowel mark
-	'ー': "",
-}
-
-// Extended katakana combinations (multi-character)
-var katakanaExtended = map[string]string{
-	"ファ": "fa", "フィ": "fi", "フェ": "fe", "フォ": "fo",
-}
-
-// Combination mappings for small ya/yu/yo
-var hiraganaCombo = map[string]string{
-	"きゃ": "kya", "きゅ": "kyu", "きょ": "kyo",
-	"しゃ": "sha", "しゅ": "shu", "しょ": "sho",
-	"ちゃ": "cha", "ちゅ": "chu", "ちょ": "cho",
-	"にゃ": "nya", "にゅ": "nyu", "にょ": "nyo",
-	"ひゃ": "hya", "ひゅ": "hyu", "ひょ": "hyo",
-	"みゃ": "mya", "みゅ": "myu", "みょ": "myo",
-	"りゃ": "rya", "りゅ": "ryu", "りょ": "ryo",
-	"ぎゃ": "gya", "ぎゅ": "gyu", "ぎょ": "gyo",
-	"じゃ": "ja", "じゅ": "ju", "じょ": "jo",
-	"びゃ": "bya", "びゅ": "byu", "びょ": "byo",
-	"ぴゃ": "pya", "ぴゅ": "pyu", "ぴょ": "pyo",
-}
-
-var katakanaCombo = map[string]string{
-	"キャ": "kya", "キュ": "kyu", "キョ": "kyo",
-	"シャ": "sha", "シュ": "shu", "ショ": "sho",
-	"チャ": "cha", "チュ": "chu", "チョ": "cho",
-	"ニャ": "nya", "ニュ": "nyu", "ニョ": "nyo",
-	"ヒャ": "hya", "ヒュ": "hyu", "ヒョ": "hyo",
-	"ミャ": "mya", "ミュ": "myu", "ミョ": "myo",
-	"リャ": "rya", "リュ": "ryu", "リョ": "ryo",
-	"ギャ": "gya", "ギュ": "gyu", "ギョ": "gyo",
-	"ジャ": "ja", "ジュ": "ju", "ジョ": "jo",
-	"ビャ": "bya", "ビュ": "byu", "ビョ": "byo",
-	"ピャ": "pya", "ピュ": "pyu", "ピョ": "pyo",
-	// Extended katakana combinations
-	"ティ": "ti", "ディ": "di",
-	"トゥ": "tu", "ドゥ": "du",
-	"ファ": "fa", "フィ": "fi", "フェ": "fe", "フォ": "fo",
-	"ウィ": "wi", "ウェ": "we", "ウォ": "wo",
-	"ヴァ": "va", "ヴィ": "vi", "ヴェ": "ve", "ヴォ": "vo",
-}
-
-// ContainsJapanese checks if a string contains Japanese characters (Hiragana, Katakana, or Kanji)
-func ContainsJapanese(s string) bool {
-	for _, r := range s {
-		if isHiragana(r) || isKatakana(r) || isKanji(r) {
-			return true
-		}
-	}
-	return false
-}
-
-// ContainsKana checks if a string contains Hiragana or Katakana (convertible to romaji)
-func ContainsKana(s string) bool {
-	for _, r := range s {
-		if isHiragana(r) || isKatakana(r) {
-			return true
-		}
-	}
-	return false
-}
-
-func isHiragana(r rune) bool {
-	return r >= hiraganaStart && r <= hiraganaEnd
-}
-
-func isKatakana(r rune) bool {
-	return r >= katakanaStart && r <= katakanaEnd
-}
-
-func isKanji(r rune) bool {
-	return r >= kanjiStart && r <= kanjiEnd
-}
-
-// ToRomaji converts Japanese kana (Hiragana/Katakana) to romaji
-// Kanji characters are preserved as-is since they require dictionary lookup
-func ToRomaji(s string) string {
-	if !ContainsKana(s) {
-		return s
-	}
-
-	runes := []rune(s)
-	var result strings.Builder
-	result.Grow(len(s) * 2) // Romaji is typically longer
-
-	i := 0
-	for i < len(runes) {
-		r := runes[i]
-
-		// Check for two-character combinations first
-		if i+1 < len(runes) {
-			combo := string(runes[i : i+2])
-			if romaji, ok := hiraganaCombo[combo]; ok {
-				result.WriteString(romaji)
-				i += 2
-				continue
-			}
-			if romaji, ok := katakanaCombo[combo]; ok {
-				result.WriteString(romaji)
-				i += 2
-				continue
-			}
-		}
-
-		// Handle small tsu (っ/ッ) - doubles the next consonant
-		if r == 'っ' || r == 'ッ' {
-			if i+1 < len(runes) {
-				nextRune := runes[i+1]
-				var nextRomaji string
-				if romaji, ok := hiraganaToRomaji[nextRune]; ok {
-					nextRomaji = romaji
-				} else if romaji, ok := katakanaToRomaji[nextRune]; ok {
-					nextRomaji = romaji
-				}
-				if len(nextRomaji) > 0 {
-					result.WriteByte(nextRomaji[0]) // Double the consonant
-				}
-			}
-			i++
-			continue
-		}
-
-		// Handle long vowel mark (ー)
-		if r == 'ー' {
-			// Extend the previous vowel
-			resultStr := result.String()
-			if len(resultStr) > 0 {
-				lastChar := resultStr[len(resultStr)-1]
-				if lastChar == 'a' || lastChar == 'i' || lastChar == 'u' || lastChar == 'e' || lastChar == 'o' {
-					result.WriteByte(lastChar)
-				}
-			}
-			i++
-			continue
-		}
-
-		// Single character conversion
-		if romaji, ok := hiraganaToRomaji[r]; ok {
-			result.WriteString(romaji)
-			i++
-			continue
-		}
-
-		if romaji, ok := katakanaToRomaji[r]; ok {
-			result.WriteString(romaji)
-			i++
-			continue
-		}
-
-		// Keep non-Japanese characters as-is
-		if unicode.IsSpace(r) {
-			result.WriteRune(' ')
-		} else {
-			result.WriteRune(r)
-		}
-		i++
-	}
-
-	return result.String()
-}
-
-// GetRomajiVariants returns search variants for Japanese text
-// Returns the original string plus romaji version if applicable
-func GetRomajiVariants(s string) []string {
-	variants := []string{s}
-
-	if ContainsKana(s) {
-		romaji := ToRomaji(s)
-		if romaji != s && strings.TrimSpace(romaji) != "" {
-			variants = append(variants, romaji)
-		}
-	}
-
-	return variants
-}

go_backend/spotify.go

@@ -62,11 +62,32 @@ type SpotifyMetadataClient struct {
 	cacheMu     sync.RWMutex
 }
 
-// NewSpotifyMetadataClient creates a new Spotify client
+// Custom credentials storage (set from Flutter)
-func NewSpotifyMetadataClient() *SpotifyMetadataClient {
+var (
-	src := rand.NewSource(time.Now().UnixNano())
+	customClientID     string
+	customClientSecret string
+	credentialsMu      sync.RWMutex
+)
 
-	// Prefer environment variables for credentials (more secure), fall back to built-in
+// SetSpotifyCredentials sets custom Spotify API credentials
+// Pass empty strings to use default credentials
+func SetSpotifyCredentials(clientID, clientSecret string) {
+	credentialsMu.Lock()
+	defer credentialsMu.Unlock()
+	customClientID = clientID
+	customClientSecret = clientSecret
+}
+
+// getCredentials returns the current credentials (custom or default)
+func getCredentials() (string, string) {
+	credentialsMu.RLock()
+	defer credentialsMu.RUnlock()
+	
+	if customClientID != "" && customClientSecret != "" {
+		return customClientID, customClientSecret
+	}
+	
+	// Fall back to default credentials
 	clientID := os.Getenv("SPOTIFY_CLIENT_ID")
 	if clientID == "" {
 		if decoded, err := base64.StdEncoding.DecodeString("NWY1NzNjOTYyMDQ5NGJhZTg3ODkwYzBmMDhhNjAyOTM="); err == nil {
@@ -80,6 +101,16 @@ func NewSpotifyMetadataClient() *SpotifyMetadataClient {
 			clientSecret = string(decoded)
 		}
 	}
+	
+	return clientID, clientSecret
+}
+
+// NewSpotifyMetadataClient creates a new Spotify client
+func NewSpotifyMetadataClient() *SpotifyMetadataClient {
+	src := rand.NewSource(time.Now().UnixNano())
+
+	// Get credentials (custom or default)
+	clientID, clientSecret := getCredentials()
 
 	c := &SpotifyMetadataClient{
 		httpClient:   NewHTTPClientWithTimeout(15 * time.Second), // Use shared transport for connection pooling
@@ -536,6 +567,7 @@ func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token s
 }
 
 func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, token string) (*PlaylistResponsePayload, error) {
+	// First request to get playlist info and first batch of tracks
 	var data struct {
 		Name   string  `json:"name"`
 		Images []image `json:"images"`
@@ -546,7 +578,8 @@ func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, t
 			Items []struct {
 				Track *trackFull `json:"track"`
 			} `json:"items"`
-			Total int `json:"total"`
+			Total int    `json:"total"`
+			Next  string `json:"next"`
 		} `json:"tracks"`
 	}
 
@@ -560,7 +593,10 @@ func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, t
 	info.Owner.Name = data.Name
 	info.Owner.Images = firstImageURL(data.Images)
 
-	tracks := make([]AlbumTrackMetadata, 0, len(data.Tracks.Items))
+	// Pre-allocate with expected capacity
+	tracks := make([]AlbumTrackMetadata, 0, data.Tracks.Total)
+	
+	// Add first batch of tracks
 	for _, item := range data.Tracks.Items {
 		if item.Track == nil {
 			continue
@@ -584,6 +620,55 @@ func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, t
 		})
 	}
 
+	// Fetch remaining tracks using pagination (up to 1000 tracks max)
+	nextURL := data.Tracks.Next
+	maxTracks := 1000
+	
+	for nextURL != "" && len(tracks) < maxTracks {
+		var pageData struct {
+			Items []struct {
+				Track *trackFull `json:"track"`
+			} `json:"items"`
+			Next string `json:"next"`
+		}
+
+		if err := c.getJSON(ctx, nextURL, token, &pageData); err != nil {
+			// Log error but return what we have so far
+			fmt.Printf("[Spotify] Warning: failed to fetch page, returning %d tracks: %v\n", len(tracks), err)
+			break
+		}
+
+		for _, item := range pageData.Items {
+			if item.Track == nil {
+				continue
+			}
+			if len(tracks) >= maxTracks {
+				break
+			}
+			tracks = append(tracks, AlbumTrackMetadata{
+				SpotifyID:   item.Track.ID,
+				Artists:     joinArtists(item.Track.Artists),
+				Name:        item.Track.Name,
+				AlbumName:   item.Track.Album.Name,
+				AlbumArtist: joinArtists(item.Track.Album.Artists),
+				DurationMS:  item.Track.DurationMS,
+				Images:      firstImageURL(item.Track.Album.Images),
+				ReleaseDate: item.Track.Album.ReleaseDate,
+				TrackNumber: item.Track.TrackNumber,
+				TotalTracks: item.Track.Album.TotalTracks,
+				DiscNumber:  item.Track.DiscNumber,
+				ExternalURL: item.Track.ExternalURL.Spotify,
+				ISRC:        item.Track.ExternalID.ISRC,
+				AlbumID:     item.Track.Album.ID,
+				AlbumURL:    item.Track.Album.ExternalURL.Spotify,
+			})
+		}
+
+		nextURL = pageData.Next
+	}
+
+	fmt.Printf("[Spotify] Fetched %d tracks from playlist (total: %d)\n", len(tracks), data.Tracks.Total)
+
 	return &PlaylistResponsePayload{
 		PlaylistInfo: info,
 		TrackList:    tracks,

go_backend/tidal.go

@@ -315,6 +315,28 @@ func (t *TidalDownloader) SearchTrackByISRC(isrc string) (*TidalTrack, error) {
 	return nil, fmt.Errorf("no exact ISRC match found for: %s", isrc)
 }
 
+// normalizeTitle normalizes a track title for comparison (kept for potential future use)
+func normalizeTitle(title string) string {
+	normalized := strings.ToLower(strings.TrimSpace(title))
+	
+	// Remove common suffixes in parentheses or brackets
+	suffixPatterns := []string{
+		" (remaster)", " (remastered)", " (deluxe)", " (deluxe edition)",
+		" (bonus track)", " (single)", " (album version)", " (radio edit)",
+		" [remaster]", " [remastered]", " [deluxe]", " [bonus track]",
+	}
+	for _, suffix := range suffixPatterns {
+		normalized = strings.TrimSuffix(normalized, suffix)
+	}
+	
+	// Remove multiple spaces
+	for strings.Contains(normalized, "  ") {
+		normalized = strings.ReplaceAll(normalized, "  ", " ")
+	}
+	
+	return normalized
+}
+
 // SearchTrackByMetadataWithISRC searches for a track with ISRC matching priority
 func (t *TidalDownloader) SearchTrackByMetadataWithISRC(trackName, artistName, spotifyISRC string, expectedDuration int) (*TidalTrack, error) {
 	token, err := t.GetAccessToken()
@@ -335,33 +357,7 @@ func (t *TidalDownloader) SearchTrackByMetadataWithISRC(trackName, artistName, s
 		queries = append(queries, trackName)
 	}
 
-	// Strategy 3: Romaji versions if Japanese detected
+	// Strategy 3: Artist only as last resort
-	if ContainsJapanese(trackName) || ContainsJapanese(artistName) {
-		// Try romaji version of track name
-		if ContainsKana(trackName) {
-			romajiTrack := ToRomaji(trackName)
-			if romajiTrack != trackName {
-				if artistName != "" {
-					queries = append(queries, artistName+" "+romajiTrack)
-				}
-				queries = append(queries, romajiTrack)
-			}
-		}
-		// Try romaji version of artist name
-		if ContainsKana(artistName) {
-			romajiArtist := ToRomaji(artistName)
-			if romajiArtist != artistName {
-				queries = append(queries, romajiArtist+" "+trackName)
-				// Try both romaji
-				if ContainsKana(trackName) {
-					romajiTrack := ToRomaji(trackName)
-					queries = append(queries, romajiArtist+" "+romajiTrack)
-				}
-			}
-		}
-	}
-
-	// Strategy 4: Artist only as last resort
 	if artistName != "" {
 		queries = append(queries, artistName)
 	}
@@ -416,14 +412,50 @@ func (t *TidalDownloader) SearchTrackByMetadataWithISRC(trackName, artistName, s
 		return nil, fmt.Errorf("no tracks found for any search query")
 	}
 
-	// Priority 1: Match by ISRC (exact match)
+	// Priority 1: Match by ISRC (exact match) WITH title verification
 	if spotifyISRC != "" {
+		var isrcMatches []*TidalTrack
 		for i := range allTracks {
 			track := &allTracks[i]
 			if track.ISRC == spotifyISRC {
-				return track, nil
+				isrcMatches = append(isrcMatches, track)
 			}
 		}
+		
+		if len(isrcMatches) > 0 {
+			// Verify duration first (most important check)
+			if expectedDuration > 0 {
+				var durationVerifiedMatches []*TidalTrack
+				for _, track := range isrcMatches {
+					durationDiff := track.Duration - expectedDuration
+					if durationDiff < 0 {
+						durationDiff = -durationDiff
+					}
+					// Allow 30 seconds tolerance for duration
+					if durationDiff <= 30 {
+						durationVerifiedMatches = append(durationVerifiedMatches, track)
+					}
+				}
+				
+				if len(durationVerifiedMatches) > 0 {
+					// Return first duration-verified match
+					fmt.Printf("[Tidal] ISRC match with duration verification: '%s' (expected %ds, found %ds)\n", 
+						durationVerifiedMatches[0].Title, expectedDuration, durationVerifiedMatches[0].Duration)
+					return durationVerifiedMatches[0], nil
+				}
+				
+				// ISRC matches but duration doesn't - this is likely wrong version
+				fmt.Printf("[Tidal] WARNING: ISRC %s found but duration mismatch. Expected=%ds, Found=%ds. Rejecting.\n", 
+					spotifyISRC, expectedDuration, isrcMatches[0].Duration)
+				return nil, fmt.Errorf("ISRC found but duration mismatch: expected %ds, found %ds (likely different version/edit)", 
+					expectedDuration, isrcMatches[0].Duration)
+			}
+			
+			// No duration to verify, just return first ISRC match
+			fmt.Printf("[Tidal] ISRC match (no duration verification): '%s'\n", isrcMatches[0].Title)
+			return isrcMatches[0], nil
+		}
+		
 		// If ISRC was provided but no match found, return error
 		return nil, fmt.Errorf("ISRC mismatch: no track found with ISRC %s on Tidal", spotifyISRC)
 	}
@@ -483,11 +515,18 @@ func (t *TidalDownloader) SearchTrackByMetadata(trackName, artistName string) (*
 }
 
 
+// TidalDownloadInfo contains download URL and quality info
+type TidalDownloadInfo struct {
+	URL        string
+	BitDepth   int
+	SampleRate int
+}
+
 // getDownloadURLSequential requests download URL from APIs sequentially
 // Returns the first successful result (supports both v1 and v2 API formats)
-func getDownloadURLSequential(apis []string, trackID int64, quality string) (string, string, error) {
+func getDownloadURLSequential(apis []string, trackID int64, quality string) (string, TidalDownloadInfo, error) {
 	if len(apis) == 0 {
-		return "", "", fmt.Errorf("no APIs available")
+		return "", TidalDownloadInfo{}, fmt.Errorf("no APIs available")
 	}
 
 	client := NewHTTPClientWithTimeout(DefaultTimeout)
@@ -519,7 +558,12 @@ func getDownloadURLSequential(apis []string, trackID int64, quality string) (str
 		// Try v2 format first (object with manifest)
 		var v2Response TidalAPIResponseV2
 		if err := json.Unmarshal(body, &v2Response); err == nil && v2Response.Data.Manifest != "" {
-			return apiURL, "MANIFEST:" + v2Response.Data.Manifest, nil
+			info := TidalDownloadInfo{
+				URL:        "MANIFEST:" + v2Response.Data.Manifest,
+				BitDepth:   v2Response.Data.BitDepth,
+				SampleRate: v2Response.Data.SampleRate,
+			}
+			return apiURL, info, nil
 		}
 
 		// Fallback to v1 format (array with OriginalTrackUrl)
@@ -529,7 +573,13 @@ func getDownloadURLSequential(apis []string, trackID int64, quality string) (str
 		if err := json.Unmarshal(body, &v1Responses); err == nil {
 			for _, item := range v1Responses {
 				if item.OriginalTrackURL != "" {
-					return apiURL, item.OriginalTrackURL, nil
+					// v1 format doesn't have quality info, assume 16-bit/44.1kHz
+					info := TidalDownloadInfo{
+						URL:        item.OriginalTrackURL,
+						BitDepth:   16,
+						SampleRate: 44100,
+					}
+					return apiURL, info, nil
 				}
 			}
 		}
@@ -537,22 +587,22 @@ func getDownloadURLSequential(apis []string, trackID int64, quality string) (str
 		errors = append(errors, BuildErrorMessage(apiURL, resp.StatusCode, "no download URL or manifest in response"))
 	}
 
-	return "", "", fmt.Errorf("all %d Tidal APIs failed. Errors: %v", len(apis), errors)
+	return "", TidalDownloadInfo{}, fmt.Errorf("all %d Tidal APIs failed. Errors: %v", len(apis), errors)
 }
 
 // GetDownloadURL gets download URL for a track - tries APIs sequentially
-func (t *TidalDownloader) GetDownloadURL(trackID int64, quality string) (string, error) {
+func (t *TidalDownloader) GetDownloadURL(trackID int64, quality string) (TidalDownloadInfo, error) {
 	apis := t.GetAvailableAPIs()
 	if len(apis) == 0 {
-		return "", fmt.Errorf("no API URL configured")
+		return TidalDownloadInfo{}, fmt.Errorf("no API URL configured")
 	}
 
-	_, downloadURL, err := getDownloadURLSequential(apis, trackID, quality)
+	_, info, err := getDownloadURLSequential(apis, trackID, quality)
 	if err != nil {
-		return "", fmt.Errorf("failed to get download URL: %w", err)
+		return TidalDownloadInfo{}, fmt.Errorf("failed to get download URL: %w", err)
 	}
 
-	return downloadURL, nil
+	return info, nil
 }
 
 // parseManifest parses Tidal manifest (supports both BTS and DASH formats)
@@ -812,15 +862,83 @@ func (t *TidalDownloader) downloadFromManifest(manifestB64, outputPath, itemID s
 	return nil
 }
 
+// TidalDownloadResult contains download result with quality info
+type TidalDownloadResult struct {
+	FilePath   string
+	BitDepth   int
+	SampleRate int
+}
+
+// artistsMatch checks if the artist names are similar enough
+func artistsMatch(spotifyArtist, tidalArtist string) bool {
+	normSpotify := strings.ToLower(strings.TrimSpace(spotifyArtist))
+	normTidal := strings.ToLower(strings.TrimSpace(tidalArtist))
+	
+	// Exact match
+	if normSpotify == normTidal {
+		return true
+	}
+	
+	// Check if one contains the other (for cases like "Artist" vs "Artist feat. Someone")
+	if strings.Contains(normSpotify, normTidal) || strings.Contains(normTidal, normSpotify) {
+		return true
+	}
+	
+	// Check first artist (before comma or feat)
+	spotifyFirst := strings.Split(normSpotify, ",")[0]
+	spotifyFirst = strings.Split(spotifyFirst, " feat")[0]
+	spotifyFirst = strings.Split(spotifyFirst, " ft.")[0]
+	spotifyFirst = strings.TrimSpace(spotifyFirst)
+	
+	tidalFirst := strings.Split(normTidal, ",")[0]
+	tidalFirst = strings.Split(tidalFirst, " feat")[0]
+	tidalFirst = strings.Split(tidalFirst, " ft.")[0]
+	tidalFirst = strings.TrimSpace(tidalFirst)
+	
+	if spotifyFirst == tidalFirst {
+		return true
+	}
+	
+	// Check if first artist is contained in the other
+	if strings.Contains(spotifyFirst, tidalFirst) || strings.Contains(tidalFirst, spotifyFirst) {
+		return true
+	}
+	
+	// If scripts are different (one is ASCII, one is non-ASCII like Japanese/Chinese/Korean),
+	// assume they're the same artist with different transliteration
+	// This handles cases like "鈴木雅之" vs "Masayuki Suzuki"
+	spotifyASCII := isASCIIString(spotifyArtist)
+	tidalASCII := isASCIIString(tidalArtist)
+	if spotifyASCII != tidalASCII {
+		fmt.Printf("[Tidal] Artist names in different scripts, assuming match: '%s' vs '%s'\n", spotifyArtist, tidalArtist)
+		return true
+	}
+	
+	return false
+}
+
+// isASCIIString checks if a string contains only ASCII characters
+func isASCIIString(s string) bool {
+	for _, r := range s {
+		if r > 127 {
+			return false
+		}
+	}
+	return true
+}
+
 // downloadFromTidal downloads a track using the request parameters
-func downloadFromTidal(req DownloadRequest) (string, error) {
+func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 	downloader := NewTidalDownloader()
 
 	// Check for existing file first
 	if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
-		return "EXISTS:" + existingFile, nil
+		return TidalDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
 	}
 
+	// Convert expected duration from ms to seconds
+	expectedDurationSec := req.DurationMS / 1000
+
 	var track *TidalTrack
 	var err error
 
@@ -832,28 +950,103 @@ func downloadFromTidal(req DownloadRequest) (string, error) {
 			trackID, idErr := downloader.GetTrackIDFromURL(tidalURL)
 			if idErr == nil {
 				track, err = downloader.GetTrackInfoByID(trackID)
+				if track != nil {
+					// Get artist name from track
+					tidalArtist := track.Artist.Name
+					if len(track.Artists) > 0 {
+						var artistNames []string
+						for _, a := range track.Artists {
+							artistNames = append(artistNames, a.Name)
+						}
+						tidalArtist = strings.Join(artistNames, ", ")
+					}
+					
+					// Verify artist matches
+					if !artistsMatch(req.ArtistName, tidalArtist) {
+						fmt.Printf("[Tidal] Artist mismatch from SongLink: expected '%s', got '%s'. Rejecting.\n", 
+							req.ArtistName, tidalArtist)
+						track = nil
+					}
+					
+					// Verify duration if we have expected duration
+					if track != nil && expectedDurationSec > 0 {
+						durationDiff := track.Duration - expectedDurationSec
+						if durationDiff < 0 {
+							durationDiff = -durationDiff
+						}
+						// Allow 30 seconds tolerance
+						if durationDiff > 30 {
+							fmt.Printf("[Tidal] Duration mismatch from SongLink: expected %ds, got %ds. Rejecting.\n", 
+								expectedDurationSec, track.Duration)
+							track = nil // Reject this match
+						}
+					}
+				}
 			}
 		}
 	}
 
-	// Strategy 2: Search by ISRC with multi-strategy fallback
+	// Strategy 2: Search by ISRC with duration verification
 	if track == nil && req.ISRC != "" {
-		track, err = downloader.SearchTrackByMetadataWithISRC(req.TrackName, req.ArtistName, req.ISRC, 0)
+		track, err = downloader.SearchTrackByMetadataWithISRC(req.TrackName, req.ArtistName, req.ISRC, expectedDurationSec)
+		// Verify artist for ISRC match too
+		if track != nil {
+			tidalArtist := track.Artist.Name
+			if len(track.Artists) > 0 {
+				var artistNames []string
+				for _, a := range track.Artists {
+					artistNames = append(artistNames, a.Name)
+				}
+				tidalArtist = strings.Join(artistNames, ", ")
+			}
+			if !artistsMatch(req.ArtistName, tidalArtist) {
+				fmt.Printf("[Tidal] Artist mismatch from ISRC search: expected '%s', got '%s'. Rejecting.\n", 
+					req.ArtistName, tidalArtist)
+				track = nil
+			}
+		}
 	}
 
 	// Strategy 3: Search by metadata only (no ISRC requirement)
 	if track == nil {
-		track, err = downloader.SearchTrackByMetadata(req.TrackName, req.ArtistName)
+		track, err = downloader.SearchTrackByMetadataWithISRC(req.TrackName, req.ArtistName, "", expectedDurationSec)
+		// Verify artist for metadata search too
+		if track != nil {
+			tidalArtist := track.Artist.Name
+			if len(track.Artists) > 0 {
+				var artistNames []string
+				for _, a := range track.Artists {
+					artistNames = append(artistNames, a.Name)
+				}
+				tidalArtist = strings.Join(artistNames, ", ")
+			}
+			if !artistsMatch(req.ArtistName, tidalArtist) {
+				fmt.Printf("[Tidal] Artist mismatch from metadata search: expected '%s', got '%s'. Rejecting.\n", 
+					req.ArtistName, tidalArtist)
+				track = nil
+			}
+		}
 	}
 
 	if track == nil {
-		errMsg := "could not find track on Tidal"
+		errMsg := "could not find matching track on Tidal (artist/duration mismatch)"
 		if err != nil {
 			errMsg = err.Error()
 		}
-		return "", fmt.Errorf("tidal search failed: %s", errMsg)
+		return TidalDownloadResult{}, fmt.Errorf("tidal search failed: %s", errMsg)
 	}
 
+	// Final verification logging
+	tidalArtist := track.Artist.Name
+	if len(track.Artists) > 0 {
+		var artistNames []string
+		for _, a := range track.Artists {
+			artistNames = append(artistNames, a.Name)
+		}
+		tidalArtist = strings.Join(artistNames, ", ")
+	}
+	fmt.Printf("[Tidal] Match found: '%s' by '%s' (duration: %ds)\n", track.Title, tidalArtist, track.Duration)
+
 	// Build filename
 	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]interface{}{
 		"title":  req.TrackName,
@@ -868,7 +1061,7 @@ func downloadFromTidal(req DownloadRequest) (string, error) {
 
 	// Check if file already exists
 	if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
-		return "EXISTS:" + outputPath, nil
+		return TidalDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
 	}
 
 	// Determine quality to use (default to LOSSLESS if not specified)
@@ -879,14 +1072,17 @@ func downloadFromTidal(req DownloadRequest) (string, error) {
 	fmt.Printf("[Tidal] Using quality: %s\n", quality)
 
 	// Get download URL using parallel API requests
-	downloadURL, err := downloader.GetDownloadURL(track.ID, quality)
+	downloadInfo, err := downloader.GetDownloadURL(track.ID, quality)
 	if err != nil {
-		return "", fmt.Errorf("failed to get download URL: %w", err)
+		return TidalDownloadResult{}, fmt.Errorf("failed to get download URL: %w", err)
 	}
 
+	// Log actual quality received
+	fmt.Printf("[Tidal] Actual quality: %d-bit/%dHz\n", downloadInfo.BitDepth, downloadInfo.SampleRate)
+
 	// Download file with item ID for progress tracking
-	if err := downloader.DownloadFile(downloadURL, outputPath, req.ItemID); err != nil {
+	if err := downloader.DownloadFile(downloadInfo.URL, outputPath, req.ItemID); err != nil {
-		return "", fmt.Errorf("download failed: %w", err)
+		return TidalDownloadResult{}, fmt.Errorf("download failed: %w", err)
 	}
 
 	// Set progress to 100% and status to finalizing (before embedding)
@@ -906,7 +1102,7 @@ func downloadFromTidal(req DownloadRequest) (string, error) {
 		fmt.Printf("[Tidal] File saved as M4A (DASH stream): %s\n", actualOutputPath)
 	} else if _, err := os.Stat(outputPath); err != nil {
 		// Neither FLAC nor M4A exists
-		return "", fmt.Errorf("download completed but file not found at %s or %s", outputPath, m4aPath)
+		return TidalDownloadResult{}, fmt.Errorf("download completed but file not found at %s or %s", outputPath, m4aPath)
 	}
 
 	// Embed metadata
@@ -952,17 +1148,6 @@ func downloadFromTidal(req DownloadRequest) (string, error) {
 				fmt.Println("[Tidal] No lyrics found for this track")
 			} else {
 				fmt.Printf("[Tidal] Lyrics found (%d lines), embedding...\n", len(lyrics.Lines))
-				
-				// Convert Japanese lyrics to romaji if enabled
-				if req.ConvertLyricsToRomaji {
-					for i := range lyrics.Lines {
-						if ContainsKana(lyrics.Lines[i].Words) {
-							lyrics.Lines[i].Words = ToRomaji(lyrics.Lines[i].Words)
-						}
-					}
-					fmt.Println("[Tidal] Converted Japanese lyrics to romaji")
-				}
-				
 				lrcContent := convertToLRC(lyrics)
 				if embedErr := EmbedLyrics(actualOutputPath, lrcContent); embedErr != nil {
 					fmt.Printf("[Tidal] Warning: failed to embed lyrics: %v\n", embedErr)
@@ -975,5 +1160,9 @@ func downloadFromTidal(req DownloadRequest) (string, error) {
 		fmt.Printf("[Tidal] Skipping metadata embed for M4A file (will be handled after conversion): %s\n", actualOutputPath)
 	}
 
-	return actualOutputPath, nil
+	return TidalDownloadResult{
+		FilePath:   actualOutputPath,
+		BitDepth:   downloadInfo.BitDepth,
+		SampleRate: downloadInfo.SampleRate,
+	}, nil
 }

ios/Runner/AppDelegate.swift

@@ -164,7 +164,8 @@ import Gobackend  // Import Go framework
             let spotifyId = args["spotify_id"] as! String
             let trackName = args["track_name"] as! String
             let artistName = args["artist_name"] as! String
-            let response = GobackendGetLyricsLRC(spotifyId, trackName, artistName, &error)
+            let filePath = args["file_path"] as? String ?? ""
+            let response = GobackendGetLyricsLRC(spotifyId, trackName, artistName, filePath, &error)
             if let error = error { throw error }
             return response
             

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 = '2.0.1';
+  static const String version = '2.0.6';
-  static const String buildNumber = '31';
+  static const String buildNumber = '36';
   static const String fullVersion = '$version+$buildNumber';
   
   

lib/models/settings.dart

@@ -16,9 +16,11 @@ class AppSettings {
   final bool checkForUpdates; // Check for updates on app start
   final bool hasSearchedBefore; // Hide helper text after first search
   final String folderOrganization; // none, artist, album, artist_album
-  final bool convertLyricsToRomaji; // Convert Japanese lyrics to romaji
   final String historyViewMode; // list, grid
   final bool askQualityBeforeDownload; // Show quality picker before each download
+  final String spotifyClientId; // Custom Spotify client ID (empty = use default)
+  final String spotifyClientSecret; // Custom Spotify client secret (empty = use default)
+  final bool useCustomSpotifyCredentials; // Whether to use custom credentials (if set)
 
   const AppSettings({
     this.defaultService = 'tidal',
@@ -33,9 +35,11 @@ class AppSettings {
     this.checkForUpdates = true, // Default: enabled
     this.hasSearchedBefore = false, // Default: show helper text
     this.folderOrganization = 'none', // Default: no folder organization
-    this.convertLyricsToRomaji = false, // Default: keep original Japanese
     this.historyViewMode = 'grid', // Default: grid view
     this.askQualityBeforeDownload = true, // Default: ask quality before download
+    this.spotifyClientId = '', // Default: use built-in credentials
+    this.spotifyClientSecret = '', // Default: use built-in credentials
+    this.useCustomSpotifyCredentials = true, // Default: use custom if set
   });
 
   AppSettings copyWith({
@@ -51,9 +55,11 @@ class AppSettings {
     bool? checkForUpdates,
     bool? hasSearchedBefore,
     String? folderOrganization,
-    bool? convertLyricsToRomaji,
     String? historyViewMode,
     bool? askQualityBeforeDownload,
+    String? spotifyClientId,
+    String? spotifyClientSecret,
+    bool? useCustomSpotifyCredentials,
   }) {
     return AppSettings(
       defaultService: defaultService ?? this.defaultService,
@@ -68,9 +74,11 @@ class AppSettings {
       checkForUpdates: checkForUpdates ?? this.checkForUpdates,
       hasSearchedBefore: hasSearchedBefore ?? this.hasSearchedBefore,
       folderOrganization: folderOrganization ?? this.folderOrganization,
-      convertLyricsToRomaji: convertLyricsToRomaji ?? this.convertLyricsToRomaji,
       historyViewMode: historyViewMode ?? this.historyViewMode,
       askQualityBeforeDownload: askQualityBeforeDownload ?? this.askQualityBeforeDownload,
+      spotifyClientId: spotifyClientId ?? this.spotifyClientId,
+      spotifyClientSecret: spotifyClientSecret ?? this.spotifyClientSecret,
+      useCustomSpotifyCredentials: useCustomSpotifyCredentials ?? this.useCustomSpotifyCredentials,
     );
   }
 

lib/models/settings.g.dart

@@ -19,9 +19,12 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
   checkForUpdates: json['checkForUpdates'] as bool? ?? true,
   hasSearchedBefore: json['hasSearchedBefore'] as bool? ?? false,
   folderOrganization: json['folderOrganization'] as String? ?? 'none',
-  convertLyricsToRomaji: json['convertLyricsToRomaji'] as bool? ?? false,
   historyViewMode: json['historyViewMode'] as String? ?? 'grid',
   askQualityBeforeDownload: json['askQualityBeforeDownload'] as bool? ?? true,
+  spotifyClientId: json['spotifyClientId'] as String? ?? '',
+  spotifyClientSecret: json['spotifyClientSecret'] as String? ?? '',
+  useCustomSpotifyCredentials:
+      json['useCustomSpotifyCredentials'] as bool? ?? true,
 );
 
 Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
@@ -38,7 +41,9 @@ Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
       'checkForUpdates': instance.checkForUpdates,
       'hasSearchedBefore': instance.hasSearchedBefore,
       'folderOrganization': instance.folderOrganization,
-      'convertLyricsToRomaji': instance.convertLyricsToRomaji,
       'historyViewMode': instance.historyViewMode,
       'askQualityBeforeDownload': instance.askQualityBeforeDownload,
+      'spotifyClientId': instance.spotifyClientId,
+      'spotifyClientSecret': instance.spotifyClientSecret,
+      'useCustomSpotifyCredentials': instance.useCustomSpotifyCredentials,
     };

lib/providers/download_queue_provider.dart

@@ -1007,7 +1007,7 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
           releaseDate: item.track.releaseDate,
           preferredService: item.service,
           itemId: item.id, // Pass item ID for progress tracking
-          convertLyricsToRomaji: settings.convertLyricsToRomaji,
+          durationMs: item.track.duration, // Duration in ms for verification
         );
       } else {
         result = await PlatformBridge.downloadTrack(
@@ -1026,16 +1026,50 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
           discNumber: item.track.discNumber ?? 1,
           releaseDate: item.track.releaseDate,
           itemId: item.id, // Pass item ID for progress tracking
-          convertLyricsToRomaji: settings.convertLyricsToRomaji,
+          durationMs: item.track.duration, // Duration in ms for verification
         );
       }
       
       _log.d('Result: $result');
       
+      // Check if item was cancelled while downloading
+      final currentItem = state.items.firstWhere((i) => i.id == item.id, orElse: () => item);
+      if (currentItem.status == DownloadStatus.skipped) {
+        _log.i('Download was cancelled, skipping result processing');
+        // Delete the downloaded file if it exists
+        final filePath = result['file_path'] as String?;
+        if (filePath != null && result['success'] == true) {
+          try {
+            final file = File(filePath);
+            if (await file.exists()) {
+              await file.delete();
+              _log.d('Deleted cancelled download file: $filePath');
+            }
+          } catch (e) {
+            _log.w('Failed to delete cancelled file: $e');
+          }
+        }
+        return;
+      }
+      
       if (result['success'] == true) {
         var filePath = result['file_path'] as String?;
         _log.i('Download success, file: $filePath');
         
+        // Get actual quality from response (if available)
+        final actualBitDepth = result['actual_bit_depth'] as int?;
+        final actualSampleRate = result['actual_sample_rate'] as int?;
+        String actualQuality = quality; // Default to requested quality
+        
+        if (actualBitDepth != null && actualBitDepth > 0) {
+          // Format: "24-bit/96kHz" or "16-bit/44.1kHz"
+          final sampleRateKHz = actualSampleRate != null && actualSampleRate > 0 
+              ? (actualSampleRate / 1000).toStringAsFixed(actualSampleRate % 1000 == 0 ? 0 : 1)
+              : '?';
+          actualQuality = '$actualBitDepth-bit/${sampleRateKHz}kHz';
+          _log.i('Actual quality: $actualQuality');
+        }
+        
         // Check if file is M4A (DASH stream from Tidal) and needs remuxing to FLAC
         if (filePath != null && filePath.endsWith('.m4a')) {
           _log.d('Converting M4A to FLAC...');
@@ -1059,6 +1093,25 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
           }
         }
         
+        // Check again if cancelled before updating status and adding to history
+        final itemAfterDownload = state.items.firstWhere((i) => i.id == item.id, orElse: () => item);
+        if (itemAfterDownload.status == DownloadStatus.skipped) {
+          _log.i('Download was cancelled during finalization, cleaning up');
+          // Delete the downloaded file
+          if (filePath != null) {
+            try {
+              final file = File(filePath);
+              if (await file.exists()) {
+                await file.delete();
+                _log.d('Deleted cancelled download file: $filePath');
+              }
+            } catch (e) {
+              _log.w('Failed to delete cancelled file: $e');
+            }
+          }
+          return;
+        }
+        
         updateItemStatus(
           item.id,
           DownloadStatus.completed,
@@ -1096,7 +1149,7 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
               discNumber: item.track.discNumber,
               duration: item.track.duration,
               releaseDate: item.track.releaseDate,
-              quality: quality,
+              quality: actualQuality,
             ),
           );
           

lib/providers/settings_provider.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:spotiflac_android/models/settings.dart';
+import 'package:spotiflac_android/services/platform_bridge.dart';
 
 const _settingsKey = 'app_settings';
 
@@ -17,6 +18,8 @@ class SettingsNotifier extends Notifier<AppSettings> {
     final json = prefs.getString(_settingsKey);
     if (json != null) {
       state = AppSettings.fromJson(jsonDecode(json));
+      // Apply Spotify credentials to Go backend on load
+      _applySpotifyCredentials();
     }
   }
 
@@ -25,6 +28,22 @@ class SettingsNotifier extends Notifier<AppSettings> {
     await prefs.setString(_settingsKey, jsonEncode(state.toJson()));
   }
 
+  /// Apply current Spotify credentials to Go backend
+  Future<void> _applySpotifyCredentials() async {
+    // Only apply custom credentials if enabled and both fields are set
+    if (state.useCustomSpotifyCredentials && 
+        state.spotifyClientId.isNotEmpty && 
+        state.spotifyClientSecret.isNotEmpty) {
+      await PlatformBridge.setSpotifyCredentials(
+        state.spotifyClientId,
+        state.spotifyClientSecret,
+      );
+    } else {
+      // Clear to use default
+      await PlatformBridge.setSpotifyCredentials('', '');
+    }
+  }
+
   void setDefaultService(String service) {
     state = state.copyWith(defaultService: service);
     _saveSettings();
@@ -89,11 +108,6 @@ class SettingsNotifier extends Notifier<AppSettings> {
     _saveSettings();
   }
 
-  void setConvertLyricsToRomaji(bool enabled) {
-    state = state.copyWith(convertLyricsToRomaji: enabled);
-    _saveSettings();
-  }
-
   void setHistoryViewMode(String mode) {
     state = state.copyWith(historyViewMode: mode);
     _saveSettings();
@@ -103,6 +117,40 @@ class SettingsNotifier extends Notifier<AppSettings> {
     state = state.copyWith(askQualityBeforeDownload: enabled);
     _saveSettings();
   }
+
+  void setSpotifyClientId(String clientId) {
+    state = state.copyWith(spotifyClientId: clientId);
+    _saveSettings();
+  }
+
+  void setSpotifyClientSecret(String clientSecret) {
+    state = state.copyWith(spotifyClientSecret: clientSecret);
+    _saveSettings();
+  }
+
+  void setSpotifyCredentials(String clientId, String clientSecret) {
+    state = state.copyWith(
+      spotifyClientId: clientId,
+      spotifyClientSecret: clientSecret,
+    );
+    _saveSettings();
+    _applySpotifyCredentials();
+  }
+
+  void clearSpotifyCredentials() {
+    state = state.copyWith(
+      spotifyClientId: '',
+      spotifyClientSecret: '',
+    );
+    _saveSettings();
+    _applySpotifyCredentials();
+  }
+
+  void setUseCustomSpotifyCredentials(bool enabled) {
+    state = state.copyWith(useCustomSpotifyCredentials: enabled);
+    _saveSettings();
+    _applySpotifyCredentials();
+  }
 }
 
 final settingsProvider = NotifierProvider<SettingsNotifier, AppSettings>(

lib/providers/track_provider.dart

@@ -118,7 +118,8 @@ class TrackNotifier extends Notifier<TrackState> {
     // Increment request ID to cancel any pending requests
     final requestId = ++_currentRequestId;
 
-    state = const TrackState(isLoading: true);
+    // Preserve hasSearchText during fetch
+    state = TrackState(isLoading: true, hasSearchText: state.hasSearchText);
 
     try {
       final parsed = await PlatformBridge.parseSpotifyUrl(url);
@@ -174,7 +175,8 @@ class TrackNotifier extends Notifier<TrackState> {
       }
     } catch (e) {
       if (!_isRequestValid(requestId)) return; // Request cancelled
-      state = TrackState(isLoading: false, error: e.toString());
+      // Preserve hasSearchText on error so user stays on search screen
+      state = TrackState(isLoading: false, error: e.toString(), hasSearchText: state.hasSearchText);
     }
   }
 
@@ -182,7 +184,8 @@ class TrackNotifier extends Notifier<TrackState> {
     // Increment request ID to cancel any pending requests
     final requestId = ++_currentRequestId;
 
-    state = const TrackState(isLoading: true);
+    // Preserve hasSearchText during search
+    state = TrackState(isLoading: true, hasSearchText: state.hasSearchText);
 
     try {
       final results = await PlatformBridge.searchSpotifyAll(query, trackLimit: 20, artistLimit: 5);
@@ -198,10 +201,12 @@ class TrackNotifier extends Notifier<TrackState> {
         tracks: tracks,
         searchArtists: artists,
         isLoading: false,
+        hasSearchText: state.hasSearchText,
       );
     } catch (e) {
       if (!_isRequestValid(requestId)) return; // Request cancelled
-      state = TrackState(isLoading: false, error: e.toString());
+      // Preserve hasSearchText on error so user stays on search screen
+      state = TrackState(isLoading: false, error: e.toString(), hasSearchText: state.hasSearchText);
     }
   }
 
@@ -261,7 +266,7 @@ class TrackNotifier extends Notifier<TrackState> {
       albumArtist: data['album_artist'] as String?,
       coverUrl: data['images'] as String?,
       isrc: data['isrc'] as String?,
-      duration: data['duration_ms'] as int? ?? 0,
+      duration: ((data['duration_ms'] as int? ?? 0) / 1000).round(),
       trackNumber: data['track_number'] as int?,
       discNumber: data['disc_number'] as int?,
       releaseDate: data['release_date'] as String?,
@@ -277,7 +282,7 @@ class TrackNotifier extends Notifier<TrackState> {
       albumArtist: data['album_artist'] as String?,
       coverUrl: data['images'] as String?,
       isrc: data['isrc'] as String?,
-      duration: data['duration_ms'] as int? ?? 0,
+      duration: ((data['duration_ms'] as int? ?? 0) / 1000).round(),
       trackNumber: data['track_number'] as int?,
       discNumber: data['disc_number'] as int?,
       releaseDate: data['release_date'] as String?,

lib/screens/album_screen.dart

@@ -104,7 +104,7 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
       albumArtist: data['album_artist'] as String?,
       coverUrl: data['images'] as String?,
       isrc: data['isrc'] as String?,
-      duration: data['duration_ms'] as int? ?? 0,
+      duration: ((data['duration_ms'] as int? ?? 0) / 1000).round(),
       trackNumber: data['track_number'] as int?,
       discNumber: data['disc_number'] as int?,
       releaseDate: data['release_date'] as String?,
@@ -126,10 +126,10 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
               padding: EdgeInsets.all(32),
               child: Center(child: CircularProgressIndicator()),
             )),
-          if (_error != null)
+            if (_error != null)
             SliverToBoxAdapter(child: Padding(
               padding: const EdgeInsets.all(16),
-              child: Text(_error!, style: TextStyle(color: colorScheme.error)),
+              child: _buildErrorWidget(_error!, colorScheme),
             )),
           if (!_isLoading && _error == null && tracks.isNotEmpty) ...[
             _buildTrackListHeader(context, colorScheme),
@@ -349,6 +349,17 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
               padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
               child: Text('Select Quality', style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold)),
             ),
+            // Disclaimer
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
+              child: Text(
+                'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                  color: colorScheme.onSurfaceVariant,
+                  fontStyle: FontStyle.italic,
+                ),
+              ),
+            ),
             _QualityOption(title: 'FLAC Lossless', subtitle: '16-bit / 44.1kHz', icon: Icons.music_note, onTap: () { Navigator.pop(context); onSelect('LOSSLESS'); }),
             _QualityOption(title: 'Hi-Res FLAC', subtitle: '24-bit / up to 96kHz', icon: Icons.high_quality, onTap: () { Navigator.pop(context); onSelect('HI_RES'); }),
             _QualityOption(title: 'Hi-Res FLAC Max', subtitle: '24-bit / up to 192kHz', icon: Icons.four_k, onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS'); }),
@@ -358,6 +369,69 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
       ),
     );
   }
+
+  /// Build error widget with special handling for rate limit (429)
+  Widget _buildErrorWidget(String error, ColorScheme colorScheme) {
+    final isRateLimit = error.contains('429') || 
+                        error.toLowerCase().contains('rate limit') ||
+                        error.toLowerCase().contains('too many requests');
+    
+    if (isRateLimit) {
+      return Card(
+        elevation: 0,
+        color: colorScheme.errorContainer,
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+        child: Padding(
+          padding: const EdgeInsets.all(16),
+          child: Row(
+            children: [
+              Icon(Icons.timer_off, color: colorScheme.onErrorContainer),
+              const SizedBox(width: 12),
+              Expanded(
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text(
+                      'Rate Limited',
+                      style: TextStyle(
+                        color: colorScheme.onErrorContainer,
+                        fontWeight: FontWeight.bold,
+                      ),
+                    ),
+                    const SizedBox(height: 4),
+                    Text(
+                      'Too many requests. Please wait a moment and try again.',
+                      style: TextStyle(
+                        color: colorScheme.onErrorContainer,
+                        fontSize: 12,
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ],
+          ),
+        ),
+      );
+    }
+    
+    // Default error display
+    return Card(
+      elevation: 0,
+      color: colorScheme.errorContainer.withValues(alpha: 0.5),
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+      child: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Row(
+          children: [
+            Icon(Icons.error_outline, color: colorScheme.error),
+            const SizedBox(width: 12),
+            Expanded(child: Text(error, style: TextStyle(color: colorScheme.error))),
+          ],
+        ),
+      ),
+    );
+  }
 }
 
 class _QualityOption extends StatelessWidget {

lib/screens/artist_screen.dart

@@ -128,7 +128,7 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
               if (_error != null)
                 SliverToBoxAdapter(child: Padding(
                   padding: const EdgeInsets.all(16),
-                  child: Text(_error!, style: TextStyle(color: colorScheme.error)),
+                  child: _buildErrorWidget(_error!, colorScheme),
                 )),
               if (!_isLoadingDiscography && _error == null) ...[
                 if (albumsOnly.isNotEmpty) SliverToBoxAdapter(child: _buildAlbumSection('Albums', albumsOnly, colorScheme)),
@@ -318,4 +318,67 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
       ),
     ));
   }
+
+  /// Build error widget with special handling for rate limit (429)
+  Widget _buildErrorWidget(String error, ColorScheme colorScheme) {
+    final isRateLimit = error.contains('429') || 
+                        error.toLowerCase().contains('rate limit') ||
+                        error.toLowerCase().contains('too many requests');
+    
+    if (isRateLimit) {
+      return Card(
+        elevation: 0,
+        color: colorScheme.errorContainer,
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+        child: Padding(
+          padding: const EdgeInsets.all(16),
+          child: Row(
+            children: [
+              Icon(Icons.timer_off, color: colorScheme.onErrorContainer),
+              const SizedBox(width: 12),
+              Expanded(
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text(
+                      'Rate Limited',
+                      style: TextStyle(
+                        color: colorScheme.onErrorContainer,
+                        fontWeight: FontWeight.bold,
+                      ),
+                    ),
+                    const SizedBox(height: 4),
+                    Text(
+                      'Too many requests. Please wait a moment and try again.',
+                      style: TextStyle(
+                        color: colorScheme.onErrorContainer,
+                        fontSize: 12,
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ],
+          ),
+        ),
+      );
+    }
+    
+    // Default error display
+    return Card(
+      elevation: 0,
+      color: colorScheme.errorContainer.withValues(alpha: 0.5),
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+      child: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Row(
+          children: [
+            Icon(Icons.error_outline, color: colorScheme.error),
+            const SizedBox(width: 12),
+            Expanded(child: Text(error, style: TextStyle(color: colorScheme.error))),
+          ],
+        ),
+      ),
+    );
+  }
 }

lib/screens/home_tab.dart

@@ -22,7 +22,6 @@ class HomeTab extends ConsumerStatefulWidget {
 
 class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClientMixin, SingleTickerProviderStateMixin {
   final _urlController = TextEditingController();
-  Timer? _debounce;
   bool _isTyping = false;
   final FocusNode _searchFocusNode = FocusNode();
   String? _lastSearchQuery; // Track last searched query to avoid duplicate searches
@@ -38,7 +37,6 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
   
   @override
   void dispose() {
-    _debounce?.cancel();
     _urlController.removeListener(_onSearchChanged);
     _urlController.dispose();
     _searchFocusNode.dispose();
@@ -48,17 +46,18 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
   /// Called when trackState changes - used to sync search bar with state
   void _onTrackStateChanged(TrackState? previous, TrackState next) {
     // If state was cleared (no content, no search text, not loading), clear the search bar
+    // BUT only if search field is not focused (to prevent clearing while user is typing)
     if (previous != null && 
         !next.hasContent && 
         !next.hasSearchText && 
         !next.isLoading &&
-        _urlController.text.isNotEmpty) {
+        _urlController.text.isNotEmpty &&
+        !_searchFocusNode.hasFocus) {
       _urlController.clear();
       setState(() => _isTyping = false);
     }
   }  void _onSearchChanged() {
     final text = _urlController.text.trim();
-    final wasFocused = _searchFocusNode.hasFocus;
     
     // Update search text state for MainShell back button handling
     ref.read(trackProvider.notifier).setSearchText(text.isNotEmpty);
@@ -68,30 +67,13 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
       setState(() => _isTyping = true);
     } else if (text.isEmpty && _isTyping) {
       setState(() => _isTyping = false);
-      ref.read(trackProvider.notifier).clear();
+      // Don't clear provider here - it causes focus issues
+      // Provider will be cleared when user explicitly clears or navigates away
       return;
     }
     
-    // Re-request focus after rebuild if it was focused
+    // No auto-search - user must press Enter to search
-    if (wasFocused) {
+    // This saves API calls and avoids rate limiting
-      WidgetsBinding.instance.addPostFrameCallback((_) {
-        if (mounted) {
-          _searchFocusNode.requestFocus();
-        }
-      });
-    }
-    
-    // Debounce all requests (URLs and searches)
-    _debounce?.cancel();
-    _debounce = Timer(const Duration(milliseconds: 400), () {
-      if (text.isEmpty) return;
-      
-      if (text.startsWith('http') || text.startsWith('spotify:')) {
-        _fetchMetadata();
-      } else if (text.length >= 2) {
-        _performSearch(text);
-      }
-    });
   }
 
   Future<void> _performSearch(String query) async {
@@ -116,7 +98,6 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
   }
 
   Future<void> _clearAndRefresh() async {
-    _debounce?.cancel();
     _urlController.clear();
     _searchFocusNode.unfocus();
     _lastSearchQuery = null; // Reset last query
@@ -222,6 +203,17 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
               padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
               child: Text('Select Quality', style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold)),
             ),
+            // Disclaimer
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
+              child: Text(
+                'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                  color: colorScheme.onSurfaceVariant,
+                  fontStyle: FontStyle.italic,
+                ),
+              ),
+            ),
             _QualityPickerOption(
               title: 'FLAC Lossless',
               subtitle: '16-bit / 44.1kHz',
@@ -274,6 +266,7 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
 
     return Scaffold(
       body: CustomScrollView(
+        keyboardDismissBehavior: ScrollViewKeyboardDismissBehavior.onDrag,
         slivers: [
           // App Bar - always present
           SliverAppBar(
@@ -468,6 +461,69 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     ));
   }
 
+  /// Build error widget with special handling for rate limit (429)
+  Widget _buildErrorWidget(String error, ColorScheme colorScheme) {
+    final isRateLimit = error.contains('429') || 
+                        error.toLowerCase().contains('rate limit') ||
+                        error.toLowerCase().contains('too many requests');
+    
+    if (isRateLimit) {
+      return Card(
+        elevation: 0,
+        color: colorScheme.errorContainer,
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+        child: Padding(
+          padding: const EdgeInsets.all(16),
+          child: Row(
+            children: [
+              Icon(Icons.timer_off, color: colorScheme.onErrorContainer),
+              const SizedBox(width: 12),
+              Expanded(
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text(
+                      'Rate Limited',
+                      style: TextStyle(
+                        color: colorScheme.onErrorContainer,
+                        fontWeight: FontWeight.bold,
+                      ),
+                    ),
+                    const SizedBox(height: 4),
+                    Text(
+                      'Too many requests. Please wait a moment before searching again.',
+                      style: TextStyle(
+                        color: colorScheme.onErrorContainer,
+                        fontSize: 12,
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ],
+          ),
+        ),
+      );
+    }
+    
+    // Default error display
+    return Card(
+      elevation: 0,
+      color: colorScheme.errorContainer.withValues(alpha: 0.5),
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+      child: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Row(
+          children: [
+            Icon(Icons.error_outline, color: colorScheme.error),
+            const SizedBox(width: 12),
+            Expanded(child: Text(error, style: TextStyle(color: colorScheme.error))),
+          ],
+        ),
+      ),
+    );
+  }
+
   // Search results slivers - only shows search results (track list)
   List<Widget> _buildSearchResults({
     required List<Track> tracks,
@@ -482,11 +538,11 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     }
     
     return [
-      // Error message
+      // Error message - with special handling for rate limit (429)
       if (error != null)
         SliverToBoxAdapter(child: Padding(
           padding: const EdgeInsets.symmetric(horizontal: 16),
-          child: Text(error, style: TextStyle(color: colorScheme.error)),
+          child: _buildErrorWidget(error, colorScheme),
         )),
 
       // Loading indicator
@@ -663,10 +719,29 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
         ),
         contentPadding: const EdgeInsets.symmetric(horizontal: 20, vertical: 16),
       ),
-      onSubmitted: (_) => _fetchMetadata(),
+      onSubmitted: (_) => _onSearchSubmitted(),
     );
   }
 
+  /// Handle Enter key press - search or fetch URL
+  void _onSearchSubmitted() {
+    final text = _urlController.text.trim();
+    if (text.isEmpty) return;
+    
+    // If it's a URL, fetch metadata
+    if (text.startsWith('http') || text.startsWith('spotify:')) {
+      _fetchMetadata();
+      _searchFocusNode.unfocus();
+      return;
+    }
+    
+    // For search queries, always search (minimum 2 chars)
+    if (text.length >= 2) {
+      _performSearch(text);
+    }
+    _searchFocusNode.unfocus();
+  }
+
 }
 
 class _QualityPickerOption extends StatelessWidget {

lib/screens/main_shell.dart

@@ -125,6 +125,13 @@ class _MainShellState extends ConsumerState<MainShell> {
   void _handleBackPress() {
     final trackState = ref.read(trackProvider);
     
+    // Check if keyboard is visible - if so, just dismiss keyboard, don't clear search
+    final isKeyboardVisible = MediaQuery.of(context).viewInsets.bottom > 0;
+    if (isKeyboardVisible) {
+      FocusScope.of(context).unfocus();
+      return;
+    }
+    
     // If on Home tab and has text in search bar or has content (but not loading), clear it
     if (_currentIndex == 0 && !trackState.isLoading && (trackState.hasSearchText || trackState.hasContent)) {
       ref.read(trackProvider.notifier).clear();
@@ -163,12 +170,17 @@ class _MainShellState extends ConsumerState<MainShell> {
     final queueState = ref.watch(downloadQueueProvider.select((s) => s.queuedCount));
     final trackState = ref.watch(trackProvider);
     
+    // Check if keyboard is visible (bottom inset > 0 means keyboard is showing)
+    final isKeyboardVisible = MediaQuery.of(context).viewInsets.bottom > 0;
+    
     // Determine if we can pop (for predictive back animation)
     // canPop is true when we're at root with no content - enables predictive back gesture
+    // IMPORTANT: Never allow pop when keyboard is visible to prevent accidental navigation
     final canPop = _currentIndex == 0 && 
                    !trackState.hasSearchText && 
                    !trackState.hasContent && 
-                   !trackState.isLoading;
+                   !trackState.isLoading &&
+                   !isKeyboardVisible;
 
     return PopScope(
       canPop: canPop,

lib/screens/playlist_screen.dart

@@ -211,6 +211,17 @@ class PlaylistScreen extends ConsumerWidget {
               Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
             ],
             Padding(padding: const EdgeInsets.fromLTRB(24, 16, 24, 8), child: Text('Select Quality', style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold))),
+            // Disclaimer
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 0, 24, 12),
+              child: Text(
+                'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                  color: colorScheme.onSurfaceVariant,
+                  fontStyle: FontStyle.italic,
+                ),
+              ),
+            ),
             _QualityOption(title: 'FLAC Lossless', subtitle: '16-bit / 44.1kHz', icon: Icons.music_note, onTap: () { Navigator.pop(context); onSelect('LOSSLESS'); }),
             _QualityOption(title: 'Hi-Res FLAC', subtitle: '24-bit / up to 96kHz', icon: Icons.high_quality, onTap: () { Navigator.pop(context); onSelect('HI_RES'); }),
             _QualityOption(title: 'Hi-Res FLAC Max', subtitle: '24-bit / up to 192kHz', icon: Icons.four_k, onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS'); }),

lib/screens/queue_tab.dart

@@ -558,6 +558,31 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                         ),
                 ),
               ),
+              // Quality badge (top-left)
+              if (item.quality != null && item.quality!.contains('bit'))
+                Positioned(
+                  left: 4,
+                  top: 4,
+                  child: Container(
+                    padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
+                    decoration: BoxDecoration(
+                      color: item.quality!.startsWith('24') 
+                          ? colorScheme.tertiary 
+                          : colorScheme.surfaceContainerHighest,
+                      borderRadius: BorderRadius.circular(4),
+                    ),
+                    child: Text(
+                      item.quality!.split('/').first, // Just show "24-bit" or "16-bit"
+                      style: Theme.of(context).textTheme.labelSmall?.copyWith(
+                        color: item.quality!.startsWith('24') 
+                            ? colorScheme.onTertiary 
+                            : colorScheme.onSurfaceVariant,
+                        fontSize: 9,
+                        fontWeight: FontWeight.w600,
+                      ),
+                    ),
+                  ),
+                ),
               // Play button overlay
               if (fileExists)
                 Positioned(
@@ -677,11 +702,38 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                       ),
                     ),
                     const SizedBox(height: 2),
-                    Text(
+                    Row(
-                      dateStr,
+                      children: [
-                      style: Theme.of(context).textTheme.labelSmall?.copyWith(
+                        Text(
-                        color: colorScheme.onSurfaceVariant.withValues(alpha: 0.7),
+                          dateStr,
-                      ),
+                          style: Theme.of(context).textTheme.labelSmall?.copyWith(
+                            color: colorScheme.onSurfaceVariant.withValues(alpha: 0.7),
+                          ),
+                        ),
+                        // Quality badge
+                        if (item.quality != null && item.quality!.contains('bit')) ...[
+                          const SizedBox(width: 8),
+                          Container(
+                            padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+                            decoration: BoxDecoration(
+                              color: item.quality!.startsWith('24') 
+                                  ? colorScheme.tertiaryContainer 
+                                  : colorScheme.surfaceContainerHighest,
+                              borderRadius: BorderRadius.circular(4),
+                            ),
+                            child: Text(
+                              item.quality!,
+                              style: Theme.of(context).textTheme.labelSmall?.copyWith(
+                                color: item.quality!.startsWith('24') 
+                                    ? colorScheme.onTertiaryContainer 
+                                    : colorScheme.onSurfaceVariant,
+                                fontSize: 10,
+                                fontWeight: FontWeight.w500,
+                              ),
+                            ),
+                          ),
+                        ],
+                      ],
                     ),
                   ],
                 ),

lib/screens/settings/about_page.dart

@@ -12,53 +12,46 @@ class AboutPage extends StatelessWidget {
     final colorScheme = Theme.of(context).colorScheme;
     final topPadding = MediaQuery.of(context).padding.top;
 
-    return Scaffold(
+    return PopScope(
-      body: CustomScrollView(
+      canPop: true,
-        slivers: [
+      child: Scaffold(
-          // Collapsing App Bar with back button
+        body: CustomScrollView(
-          SliverAppBar(
+          slivers: [
-            expandedHeight: 120 + topPadding,
+            // Collapsing App Bar with back button
-            collapsedHeight: kToolbarHeight,
+            SliverAppBar(
-            floating: false,
+              expandedHeight: 120 + topPadding,
-            pinned: true,
+              collapsedHeight: kToolbarHeight,
-            backgroundColor: colorScheme.surface,
+              floating: false,
-            surfaceTintColor: Colors.transparent,
+              pinned: true,
-            leading: IconButton(
+              backgroundColor: colorScheme.surface,
-              icon: const Icon(Icons.arrow_back),
+              surfaceTintColor: Colors.transparent,
-              onPressed: () => Navigator.pop(context),
+              leading: IconButton(
-            ),
+                icon: const Icon(Icons.arrow_back),
-            flexibleSpace: LayoutBuilder(
+                onPressed: () => Navigator.pop(context),
-              builder: (context, constraints) {
+              ),
-                final maxHeight = 120 + topPadding;
+              flexibleSpace: LayoutBuilder(
-                final minHeight = kToolbarHeight + topPadding;
+                builder: (context, constraints) {
-                final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
+                  final maxHeight = 120 + topPadding;
-                final animation = AlwaysStoppedAnimation(expandRatio);
+                  final minHeight = kToolbarHeight + topPadding;
-                return FlexibleSpaceBar(
+                  final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
-                  expandedTitleScale: 1.0,
+                  // When collapsed (expandRatio=0): left=56 to avoid back button
-                  titlePadding: EdgeInsets.zero,
+                  // When expanded (expandRatio=1): left=24 for normal padding
-                  title: SafeArea(
+                  final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
-                    child: Container(
+                  return FlexibleSpaceBar(
-                      alignment: Alignment.bottomLeft,
+                    expandedTitleScale: 1.0,
-                      padding: EdgeInsets.only(
+                    titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
-                        // When collapsed (expandRatio=0): left=56 to align with back button
+                    title: Text(
-                        // When expanded (expandRatio=1): left=24 for normal padding
+                      'About',
-                        left: Tween<double>(begin: 56, end: 24).evaluate(animation),
+                      style: TextStyle(
-                        bottom: Tween<double>(begin: 16, end: 16).evaluate(animation),
+                        fontSize: 20 + (8 * expandRatio), // 20 -> 28
-                      ),
+                        fontWeight: FontWeight.bold,
-                      child: Text(
+                        color: colorScheme.onSurface,
-                        'About',
-                        style: TextStyle(
-                          fontSize: Tween<double>(begin: 20, end: 28).evaluate(animation),
-                          fontWeight: FontWeight.bold,
-                          color: colorScheme.onSurface,
-                        ),
                       ),
                     ),
-                  ),
+                  );
-                );
+                },
-              },
+              ),
             ),
-          ),
 
           // App header card with logo and description
           SliverToBoxAdapter(
@@ -166,6 +159,7 @@ class AboutPage extends StatelessWidget {
           const SliverToBoxAdapter(child: SizedBox(height: 16)),
         ],
       ),
+      ),
     );
   }
 

lib/screens/settings/appearance_settings_page.dart

@@ -14,104 +14,113 @@ class AppearanceSettingsPage extends ConsumerWidget {
     final colorScheme = Theme.of(context).colorScheme;
     final topPadding = MediaQuery.of(context).padding.top;
 
-    return Scaffold(
+    return PopScope(
-      body: CustomScrollView(
+      canPop: true,
-        slivers: [
+      child: Scaffold(
-          // Collapsing App Bar with back button
+        body: CustomScrollView(
-          SliverAppBar(
+          slivers: [
-            expandedHeight: 120 + topPadding,
+            // Collapsing App Bar with back button
-            collapsedHeight: kToolbarHeight,
+            SliverAppBar(
-            floating: false,
+              expandedHeight: 120 + topPadding,
-            pinned: true,
+              collapsedHeight: kToolbarHeight,
-            backgroundColor: colorScheme.surface,
+              floating: false,
-            surfaceTintColor: Colors.transparent,
+              pinned: true,
-            leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
+              backgroundColor: colorScheme.surface,
-            flexibleSpace: LayoutBuilder(
+              surfaceTintColor: Colors.transparent,
-              builder: (context, constraints) {
+              leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
-                final maxHeight = 120 + topPadding;
+              flexibleSpace: _AppBarTitle(title: 'Appearance', topPadding: topPadding),
-                final minHeight = kToolbarHeight + topPadding;
+            ),
-                final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
+
-                final animation = AlwaysStoppedAnimation(expandRatio);
+            // Theme section
-                return FlexibleSpaceBar(
+            const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Theme')),
-                  expandedTitleScale: 1.0,
+            SliverToBoxAdapter(
-                  titlePadding: EdgeInsets.zero,
+              child: SettingsGroup(
-                  title: SafeArea(
+                children: [
-                    child: Container(
+                  _ThemeModeSelector(
-                      alignment: Alignment.bottomLeft,
+                    currentMode: themeSettings.themeMode,
-                      padding: EdgeInsets.only(
+                    onChanged: (mode) => ref.read(themeProvider.notifier).setThemeMode(mode),
-                        left: Tween<double>(begin: 56, end: 24).evaluate(animation),
+                  ),
-                        bottom: Tween<double>(begin: 16, end: 16).evaluate(animation),
+                ],
-                      ),
+              ),
-                      child: Text('Appearance',
+            ),
-                        style: TextStyle(
+
-                          fontSize: Tween<double>(begin: 20, end: 28).evaluate(animation),
+            // Color section
-                          fontWeight: FontWeight.bold,
+            const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Color')),
-                          color: colorScheme.onSurface,
+            SliverToBoxAdapter(
-                        ),
+              child: SettingsGroup(
-                      ),
+                children: [
+                  SettingsSwitchItem(
+                    icon: Icons.auto_awesome,
+                    title: 'Dynamic Color',
+                    subtitle: 'Use colors from your wallpaper',
+                    value: themeSettings.useDynamicColor,
+                    onChanged: (value) => ref.read(themeProvider.notifier).setUseDynamicColor(value),
+                    showDivider: !themeSettings.useDynamicColor,
+                  ),
+                  if (!themeSettings.useDynamicColor)
+                    _ColorPicker(
+                      currentColor: themeSettings.seedColorValue,
+                      onColorSelected: (color) => ref.read(themeProvider.notifier).setSeedColor(color),
                     ),
+                ],
+              ),
+            ),
+
+            // Layout section
+            const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Layout')),
+            SliverToBoxAdapter(
+              child: SettingsGroup(
+                children: [
+                  _HistoryViewSelector(
+                    currentMode: settings.historyViewMode,
+                    onChanged: (mode) => ref.read(settingsProvider.notifier).setHistoryViewMode(mode),
                   ),
-                );
+                ],
-              },
+              ),
             ),
-          ),
 
-          // Theme section
+            // Fill remaining for scroll
-          const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Theme')),
+            const SliverFillRemaining(hasScrollBody: false, child: SizedBox()),
-          SliverToBoxAdapter(
+          ],
-            child: SettingsGroup(
+        ),
-              children: [
-                _ThemeModeSelector(
-                  currentMode: themeSettings.themeMode,
-                  onChanged: (mode) => ref.read(themeProvider.notifier).setThemeMode(mode),
-                ),
-              ],
-            ),
-          ),
-
-          // Color section
-          const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Color')),
-          SliverToBoxAdapter(
-            child: SettingsGroup(
-              children: [
-                SettingsSwitchItem(
-                  icon: Icons.auto_awesome,
-                  title: 'Dynamic Color',
-                  subtitle: 'Use colors from your wallpaper',
-                  value: themeSettings.useDynamicColor,
-                  onChanged: (value) => ref.read(themeProvider.notifier).setUseDynamicColor(value),
-                  showDivider: !themeSettings.useDynamicColor,
-                ),
-                if (!themeSettings.useDynamicColor)
-                  _ColorPicker(
-                    currentColor: themeSettings.seedColorValue,
-                    onColorSelected: (color) => ref.read(themeProvider.notifier).setSeedColor(color),
-                  ),
-              ],
-            ),
-          ),
-
-          // Layout section
-          const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Layout')),
-          SliverToBoxAdapter(
-            child: SettingsGroup(
-              children: [
-                _HistoryViewSelector(
-                  currentMode: settings.historyViewMode,
-                  onChanged: (mode) => ref.read(settingsProvider.notifier).setHistoryViewMode(mode),
-                ),
-              ],
-            ),
-          ),
-
-          // Fill remaining for scroll
-          const SliverFillRemaining(hasScrollBody: false, child: SizedBox()),
-        ],
       ),
     );
   }
 }
 
+/// Optimized app bar title with animation
+class _AppBarTitle extends StatelessWidget {
+  final String title;
+  final double topPadding;
+  
+  const _AppBarTitle({required this.title, required this.topPadding});
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return 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); // 56 -> 24
+        return FlexibleSpaceBar(
+          expandedTitleScale: 1.0,
+          titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+          title: Text(
+            title,
+            style: TextStyle(
+              fontSize: 20 + (8 * expandRatio), // 20 -> 28
+              fontWeight: FontWeight.bold,
+              color: colorScheme.onSurface,
+            ),
+          ),
+        );
+      },
+    );
+  }
+}
+
 class _ThemeModeSelector extends StatelessWidget {
   final ThemeMode currentMode;
   final ValueChanged<ThemeMode> onChanged;

lib/screens/settings/download_settings_page.dart

@@ -13,47 +13,41 @@ class DownloadSettingsPage extends ConsumerWidget {
     final colorScheme = Theme.of(context).colorScheme;
     final topPadding = MediaQuery.of(context).padding.top;
 
-    return Scaffold(
+    return PopScope(
-      body: CustomScrollView(
+      canPop: true,
-        slivers: [
+      child: Scaffold(
-          // Collapsing App Bar with back button
+        body: CustomScrollView(
-          SliverAppBar(
+          slivers: [
-            expandedHeight: 120 + topPadding,
+            // Collapsing App Bar with back button
-            collapsedHeight: kToolbarHeight,
+            SliverAppBar(
-            floating: false,
+              expandedHeight: 120 + topPadding,
-            pinned: true,
+              collapsedHeight: kToolbarHeight,
-            backgroundColor: colorScheme.surface,
+              floating: false,
-            surfaceTintColor: Colors.transparent,
+              pinned: true,
-            leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
+              backgroundColor: colorScheme.surface,
-            flexibleSpace: LayoutBuilder(
+              surfaceTintColor: Colors.transparent,
-              builder: (context, constraints) {
+              leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
-                final maxHeight = 120 + topPadding;
+              flexibleSpace: LayoutBuilder(
-                final minHeight = kToolbarHeight + topPadding;
+                builder: (context, constraints) {
-                final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
+                  final maxHeight = 120 + topPadding;
-                final animation = AlwaysStoppedAnimation(expandRatio);
+                  final minHeight = kToolbarHeight + topPadding;
-                return FlexibleSpaceBar(
+                  final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
-                  expandedTitleScale: 1.0,
+                  final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
-                  titlePadding: EdgeInsets.zero,
+                  return FlexibleSpaceBar(
-                  title: SafeArea(
+                    expandedTitleScale: 1.0,
-                    child: Container(
+                    titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
-                      alignment: Alignment.bottomLeft,
+                    title: Text(
-                      padding: EdgeInsets.only(
+                      'Download',
-                        left: Tween<double>(begin: 56, end: 24).evaluate(animation),
+                      style: TextStyle(
-                        bottom: Tween<double>(begin: 16, end: 16).evaluate(animation),
+                        fontSize: 20 + (8 * expandRatio), // 20 -> 28
-                      ),
+                        fontWeight: FontWeight.bold,
-                      child: Text('Download',
+                        color: colorScheme.onSurface,
-                        style: TextStyle(
-                          fontSize: Tween<double>(begin: 20, end: 28).evaluate(animation),
-                          fontWeight: FontWeight.bold,
-                          color: colorScheme.onSurface,
-                        ),
                       ),
                     ),
-                  ),
+                  );
-                );
+                },
-              },
+              ),
             ),
-          ),
 
           // Service section
           const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Service')),
@@ -136,6 +130,7 @@ class DownloadSettingsPage extends ConsumerWidget {
           const SliverToBoxAdapter(child: SizedBox(height: 32)),
         ],
       ),
+      ),
     );
   }
 

lib/screens/settings/options_settings_page.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/models/settings.dart';
 import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
 import 'package:spotiflac_android/widgets/settings_group.dart';
@@ -13,47 +14,41 @@ class OptionsSettingsPage extends ConsumerWidget {
     final colorScheme = Theme.of(context).colorScheme;
     final topPadding = MediaQuery.of(context).padding.top;
 
-    return Scaffold(
+    return PopScope(
-      body: CustomScrollView(
+      canPop: true,
-        slivers: [
+      child: Scaffold(
-          // Collapsing App Bar with back button
+        body: CustomScrollView(
-          SliverAppBar(
+          slivers: [
-            expandedHeight: 120 + topPadding,
+            // Collapsing App Bar with back button
-            collapsedHeight: kToolbarHeight,
+            SliverAppBar(
-            floating: false,
+              expandedHeight: 120 + topPadding,
-            pinned: true,
+              collapsedHeight: kToolbarHeight,
-            backgroundColor: colorScheme.surface,
+              floating: false,
-            surfaceTintColor: Colors.transparent,
+              pinned: true,
-            leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
+              backgroundColor: colorScheme.surface,
-            flexibleSpace: LayoutBuilder(
+              surfaceTintColor: Colors.transparent,
-              builder: (context, constraints) {
+              leading: IconButton(icon: const Icon(Icons.arrow_back), onPressed: () => Navigator.pop(context)),
-                final maxHeight = 120 + topPadding;
+              flexibleSpace: LayoutBuilder(
-                final minHeight = kToolbarHeight + topPadding;
+                builder: (context, constraints) {
-                final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
+                  final maxHeight = 120 + topPadding;
-                final animation = AlwaysStoppedAnimation(expandRatio);
+                  final minHeight = kToolbarHeight + topPadding;
-                return FlexibleSpaceBar(
+                  final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
-                  expandedTitleScale: 1.0,
+                  final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
-                  titlePadding: EdgeInsets.zero,
+                  return FlexibleSpaceBar(
-                  title: SafeArea(
+                    expandedTitleScale: 1.0,
-                    child: Container(
+                    titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
-                      alignment: Alignment.bottomLeft,
+                    title: Text(
-                      padding: EdgeInsets.only(
+                      'Options',
-                        left: Tween<double>(begin: 56, end: 24).evaluate(animation),
+                      style: TextStyle(
-                        bottom: Tween<double>(begin: 16, end: 16).evaluate(animation),
+                        fontSize: 20 + (8 * expandRatio), // 20 -> 28
-                      ),
+                        fontWeight: FontWeight.bold,
-                      child: Text('Options',
+                        color: colorScheme.onSurface,
-                        style: TextStyle(
-                          fontSize: Tween<double>(begin: 20, end: 28).evaluate(animation),
-                          fontWeight: FontWeight.bold,
-                          color: colorScheme.onSurface,
-                        ),
                       ),
                     ),
-                  ),
+                  );
-                );
+                },
-              },
+              ),
             ),
-          ),
 
           // Download options section
           const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Download')),
@@ -99,23 +94,6 @@ class OptionsSettingsPage extends ConsumerWidget {
             ),
           ),
 
-          // Lyrics section
-          const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Lyrics')),
-          SliverToBoxAdapter(
-            child: SettingsGroup(
-              children: [
-                SettingsSwitchItem(
-                  icon: Icons.translate,
-                  title: 'Convert Japanese to Romaji',
-                  subtitle: 'Auto-convert Hiragana/Katakana lyrics',
-                  value: settings.convertLyricsToRomaji,
-                  onChanged: (v) => ref.read(settingsProvider.notifier).setConvertLyricsToRomaji(v),
-                  showDivider: false,
-                ),
-              ],
-            ),
-          ),
-
           // App section
           const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'App')),
           SliverToBoxAdapter(
@@ -133,6 +111,38 @@ class OptionsSettingsPage extends ConsumerWidget {
             ),
           ),
 
+          // Spotify API section
+          const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Spotify API')),
+          SliverToBoxAdapter(
+            child: SettingsGroup(
+              children: [
+                SettingsItem(
+                  icon: Icons.key,
+                  title: 'Custom Credentials',
+                  subtitle: settings.spotifyClientId.isNotEmpty 
+                      ? 'Client ID: ${settings.spotifyClientId.length > 8 ? '${settings.spotifyClientId.substring(0, 8)}...' : settings.spotifyClientId}' 
+                      : 'Not configured',
+                  onTap: () => _showSpotifyCredentialsDialog(context, ref, settings),
+                  trailing: settings.spotifyClientId.isNotEmpty
+                      ? Icon(Icons.edit, color: Theme.of(context).colorScheme.onSurfaceVariant, size: 20)
+                      : Icon(Icons.add, color: Theme.of(context).colorScheme.primary, size: 20),
+                  showDivider: settings.spotifyClientId.isNotEmpty,
+                ),
+                if (settings.spotifyClientId.isNotEmpty)
+                  SettingsSwitchItem(
+                    icon: Icons.toggle_on,
+                    title: 'Use Custom Credentials',
+                    subtitle: settings.useCustomSpotifyCredentials 
+                        ? 'Using your credentials' 
+                        : 'Using default credentials',
+                    value: settings.useCustomSpotifyCredentials,
+                    onChanged: (v) => ref.read(settingsProvider.notifier).setUseCustomSpotifyCredentials(v),
+                    showDivider: false,
+                  ),
+              ],
+            ),
+          ),
+
           // Data section
           const SliverToBoxAdapter(child: SettingsSectionHeader(title: 'Data')),
           SliverToBoxAdapter(
@@ -152,6 +162,7 @@ class OptionsSettingsPage extends ConsumerWidget {
           const SliverToBoxAdapter(child: SizedBox(height: 32)),
         ],
       ),
+      ),
     );
   }
 
@@ -180,6 +191,132 @@ class OptionsSettingsPage extends ConsumerWidget {
       ),
     );
   }
+
+  void _showSpotifyCredentialsDialog(BuildContext context, WidgetRef ref, AppSettings settings) {
+    final clientIdController = TextEditingController(text: settings.spotifyClientId);
+    final clientSecretController = TextEditingController(text: settings.spotifyClientSecret);
+    final colorScheme = Theme.of(context).colorScheme;
+
+    showModalBottomSheet(
+      context: context,
+      isScrollControlled: true,
+      backgroundColor: colorScheme.surfaceContainerHigh,
+      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: Column(
+              mainAxisSize: MainAxisSize.min,
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                const SizedBox(height: 8),
+                Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
+                Padding(
+                  padding: const EdgeInsets.fromLTRB(24, 20, 24, 8),
+                  child: Text('Spotify API Credentials', style: Theme.of(context).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold)),
+                ),
+                Padding(
+                  padding: const EdgeInsets.fromLTRB(24, 0, 24, 16),
+                  child: Text(
+                    'Use your own credentials to avoid rate limiting.',
+                    style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
+                  ),
+                ),
+                Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 24),
+                  child: TextField(
+                    controller: clientIdController,
+                    decoration: InputDecoration(
+                      labelText: 'Client ID',
+                      hintText: 'Enter Spotify Client ID',
+                      filled: true,
+                      fillColor: colorScheme.surfaceContainerLow,
+                      border: OutlineInputBorder(borderRadius: BorderRadius.circular(16), borderSide: BorderSide(color: colorScheme.outline.withValues(alpha: 0.3))),
+                      enabledBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(16), borderSide: BorderSide(color: colorScheme.outline.withValues(alpha: 0.3))),
+                      focusedBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(16), borderSide: BorderSide(color: colorScheme.primary, width: 2)),
+                    ),
+                  ),
+                ),
+                const SizedBox(height: 12),
+                Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 24),
+                  child: TextField(
+                    controller: clientSecretController,
+                    obscureText: true,
+                    decoration: InputDecoration(
+                      labelText: 'Client Secret',
+                      hintText: 'Enter Spotify Client Secret',
+                      filled: true,
+                      fillColor: colorScheme.surfaceContainerLow,
+                      border: OutlineInputBorder(borderRadius: BorderRadius.circular(16), borderSide: BorderSide(color: colorScheme.outline.withValues(alpha: 0.3))),
+                      enabledBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(16), borderSide: BorderSide(color: colorScheme.outline.withValues(alpha: 0.3))),
+                      focusedBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(16), borderSide: BorderSide(color: colorScheme.primary, width: 2)),
+                    ),
+                  ),
+                ),
+                const SizedBox(height: 24),
+                Padding(
+                  padding: const EdgeInsets.fromLTRB(24, 0, 24, 16),
+                  child: Row(
+                    children: [
+                      if (settings.spotifyClientId.isNotEmpty)
+                        Expanded(
+                          child: OutlinedButton(
+                            onPressed: () {
+                              ref.read(settingsProvider.notifier).clearSpotifyCredentials();
+                              Navigator.pop(context);
+                              ScaffoldMessenger.of(context).showSnackBar(
+                                const SnackBar(content: Text('Credentials cleared')),
+                              );
+                            },
+                            style: OutlinedButton.styleFrom(
+                              foregroundColor: colorScheme.error,
+                              side: BorderSide(color: colorScheme.error),
+                              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+                              minimumSize: const Size.fromHeight(52),
+                            ),
+                            child: const Text('Clear'),
+                          ),
+                        ),
+                      if (settings.spotifyClientId.isNotEmpty) const SizedBox(width: 12),
+                      Expanded(
+                        child: FilledButton(
+                          onPressed: () {
+                            final clientId = clientIdController.text.trim();
+                            final clientSecret = clientSecretController.text.trim();
+                            
+                            if (clientId.isNotEmpty && clientSecret.isNotEmpty) {
+                              ref.read(settingsProvider.notifier).setSpotifyCredentials(clientId, clientSecret);
+                              Navigator.pop(context);
+                              ScaffoldMessenger.of(context).showSnackBar(
+                                const SnackBar(content: Text('Credentials saved')),
+                              );
+                            } else if (clientId.isEmpty && clientSecret.isEmpty) {
+                              Navigator.pop(context);
+                            } else {
+                              ScaffoldMessenger.of(context).showSnackBar(
+                                const SnackBar(content: Text('Please fill both Client ID and Secret')),
+                              );
+                            }
+                          },
+                          style: FilledButton.styleFrom(
+                            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+                            minimumSize: const Size.fromHeight(52),
+                          ),
+                          child: const Text('Save'),
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
 }
 
 class _ConcurrentDownloadsItem extends StatelessWidget {

lib/screens/settings_screen.dart

@@ -392,7 +392,19 @@ class SettingsScreen extends ConsumerWidget {
         title: const Text('Select Quality'),
         content: Column(
           mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
           children: [
+            // Disclaimer
+            Padding(
+              padding: const EdgeInsets.only(bottom: 12),
+              child: Text(
+                'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                  color: colorScheme.onSurfaceVariant,
+                  fontStyle: FontStyle.italic,
+                ),
+              ),
+            ),
             _buildQualityOption(context, ref, 'LOSSLESS', 'FLAC (Lossless)', '16-bit / 44.1kHz', current, colorScheme),
             _buildQualityOption(context, ref, 'HI_RES', 'Hi-Res FLAC', '24-bit / up to 192kHz', current, colorScheme),
           ],

lib/screens/settings_tab.dart

@@ -389,7 +389,19 @@ class _SettingsTabState extends ConsumerState<SettingsTab> with AutomaticKeepAli
         title: const Text('Select Quality'),
         content: Column(
           mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
           children: [
+            // Disclaimer
+            Padding(
+              padding: const EdgeInsets.only(bottom: 12),
+              child: Text(
+                'Actual quality depends on track availability. Hi-Res may not be available for all tracks.',
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                  color: colorScheme.onSurfaceVariant,
+                  fontStyle: FontStyle.italic,
+                ),
+              ),
+            ),
             _buildQualityOption(context, ref, 'LOSSLESS', 'FLAC (Lossless)', '16-bit / 44.1kHz', current, colorScheme),
             _buildQualityOption(context, ref, 'HI_RES', 'Hi-Res FLAC', '24-bit / up to 96kHz', current, colorScheme),
             _buildQualityOption(context, ref, 'HI_RES_LOSSLESS', 'Hi-Res FLAC Max', '24-bit / up to 192kHz', current, colorScheme),

lib/screens/setup_screen.dart

@@ -87,10 +87,43 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
         PermissionStatus status;
         
         if (_androidSdkVersion >= 33) {
+          // Android 13+: Use audio permission
           status = await Permission.audio.request();
         } else if (_androidSdkVersion >= 30) {
-          status = await Permission.manageExternalStorage.request();
+          // Android 11-12: Need MANAGE_EXTERNAL_STORAGE
+          // This opens system settings, not a dialog
+          status = await Permission.manageExternalStorage.status;
+          if (!status.isGranted) {
+            // Show explanation dialog first
+            if (mounted) {
+              final shouldOpen = await showDialog<bool>(
+                context: context,
+                builder: (context) => AlertDialog(
+                  title: const Text('Storage Access Required'),
+                  content: const Text(
+                    'Android 11+ requires "All files access" permission to save music files.\n\n'
+                    'Please enable "Allow access to manage all files" in the next screen.',
+                  ),
+                  actions: [
+                    TextButton(
+                      onPressed: () => Navigator.pop(context, false),
+                      child: const Text('Cancel'),
+                    ),
+                    FilledButton(
+                      onPressed: () => Navigator.pop(context, true),
+                      child: const Text('Open Settings'),
+                    ),
+                  ],
+                ),
+              );
+              
+              if (shouldOpen == true) {
+                status = await Permission.manageExternalStorage.request();
+              }
+            }
+          }
         } else {
+          // Android 10 and below: Use legacy storage permission
           status = await Permission.storage.request();
         }
         

lib/screens/track_metadata_screen.dart

@@ -47,6 +47,11 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
         _fileExists = exists;
         _fileSize = size;
       });
+      
+      // Auto-load lyrics if file exists (embedded lyrics are instant)
+      if (exists) {
+        _fetchLyrics();
+      }
     }
   }
 
@@ -359,22 +364,38 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
   Future<void> _openSpotifyUrl(BuildContext context) async {
     if (item.spotifyId == null) return;
     
-    final url = 'https://open.spotify.com/track/${item.spotifyId}';
+    final webUrl = 'https://open.spotify.com/track/${item.spotifyId}';
+    final spotifyUri = Uri.parse('spotify:track:${item.spotifyId}');
+    
     try {
-      // Try to open in Spotify app first, fallback to browser
+      // Try to open in Spotify app first using URI scheme
-      final uri = Uri.parse('spotify:track:${item.spotifyId}');
+      final launched = await launchUrl(
-      // ignore: deprecated_member_use
+        spotifyUri,
-      if (await canLaunchUrl(uri)) {
+        mode: LaunchMode.externalApplication,
-        await launchUrl(uri);
+      );
-      } else {
+      
-        await launchUrl(Uri.parse(url), mode: LaunchMode.externalApplication);
+      if (!launched) {
+        // Fallback to web URL which will redirect to app if installed
+        await launchUrl(
+          Uri.parse(webUrl),
+          mode: LaunchMode.externalApplication,
+        );
       }
     } catch (e) {
-      if (context.mounted) {
+      // If URI scheme fails, try web URL
-        _copyToClipboard(context, url);
+      try {
-        ScaffoldMessenger.of(context).showSnackBar(
+        await launchUrl(
-          const SnackBar(content: Text('Spotify URL copied to clipboard')),
+          Uri.parse(webUrl),
+          mode: LaunchMode.externalApplication,
         );
+      } catch (_) {
+        // Last resort: copy to clipboard
+        if (context.mounted) {
+          _copyToClipboard(context, webUrl);
+          ScaffoldMessenger.of(context).showSnackBar(
+            const SnackBar(content: Text('Spotify URL copied to clipboard')),
+          );
+        }
       }
     }
   }
@@ -392,6 +413,8 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
         _MetadataItem('Disc number', item.discNumber.toString()),
       if (item.duration != null)
         _MetadataItem('Duration', _formatDuration(item.duration!)),
+      if (item.quality != null && item.quality!.contains('bit'))
+        _MetadataItem('Audio quality', item.quality!),
       if (item.releaseDate != null && item.releaseDate!.isNotEmpty)
         _MetadataItem('Release date', item.releaseDate!),
       if (item.isrc != null && item.isrc!.isNotEmpty)
@@ -740,6 +763,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
         item.spotifyId ?? '',
         item.trackName,
         item.artistName,
+        filePath: _fileExists ? item.filePath : null, // Try embedded lyrics first
       );
       
       if (mounted) {

lib/services/platform_bridge.dart

@@ -60,12 +60,12 @@ class PlatformBridge {
     String quality = 'LOSSLESS',
     bool embedLyrics = true,
     bool embedMaxQualityCover = true,
-    bool convertLyricsToRomaji = false,
     int trackNumber = 1,
     int discNumber = 1,
     int totalTracks = 1,
     String? releaseDate,
     String? itemId,
+    int durationMs = 0,
   }) async {
     final request = jsonEncode({
       'isrc': isrc,
@@ -81,12 +81,12 @@ class PlatformBridge {
       'quality': quality,
       'embed_lyrics': embedLyrics,
       'embed_max_quality_cover': embedMaxQualityCover,
-      'convert_lyrics_to_romaji': convertLyricsToRomaji,
       'track_number': trackNumber,
       'disc_number': discNumber,
       'total_tracks': totalTracks,
       'release_date': releaseDate ?? '',
       'item_id': itemId ?? '',
+      'duration_ms': durationMs,
     });
     
     final result = await _channel.invokeMethod('downloadTrack', request);
@@ -107,13 +107,13 @@ class PlatformBridge {
     String quality = 'LOSSLESS',
     bool embedLyrics = true,
     bool embedMaxQualityCover = true,
-    bool convertLyricsToRomaji = false,
     int trackNumber = 1,
     int discNumber = 1,
     int totalTracks = 1,
     String? releaseDate,
     String preferredService = 'tidal',
     String? itemId,
+    int durationMs = 0,
   }) async {
     final request = jsonEncode({
       'isrc': isrc,
@@ -129,12 +129,12 @@ class PlatformBridge {
       'quality': quality,
       'embed_lyrics': embedLyrics,
       'embed_max_quality_cover': embedMaxQualityCover,
-      'convert_lyrics_to_romaji': convertLyricsToRomaji,
       'track_number': trackNumber,
       'disc_number': discNumber,
       'total_tracks': totalTracks,
       'release_date': releaseDate ?? '',
       'item_id': itemId ?? '',
+      'duration_ms': durationMs,
     });
     
     final result = await _channel.invokeMethod('downloadWithFallback', request);
@@ -214,15 +214,18 @@ class PlatformBridge {
   }
 
   /// Get lyrics in LRC format
+  /// First tries to extract from embedded file, then falls back to internet
   static Future<String> getLyricsLRC(
     String spotifyId,
     String trackName,
-    String artistName,
+    String artistName, {
-  ) async {
+    String? filePath,
+  }) async {
     final result = await _channel.invokeMethod('getLyricsLRC', {
       'spotify_id': spotifyId,
       'track_name': trackName,
       'artist_name': artistName,
+      'file_path': filePath ?? '',
     });
     return result as String;
   }
@@ -285,4 +288,13 @@ class PlatformBridge {
     final result = await _channel.invokeMethod('isDownloadServiceRunning');
     return result as bool;
   }
+
+  /// Set custom Spotify API credentials
+  /// Pass empty strings to use default credentials
+  static Future<void> setSpotifyCredentials(String clientId, String clientSecret) async {
+    await _channel.invokeMethod('setSpotifyCredentials', {
+      'client_id': clientId,
+      'client_secret': clientSecret,
+    });
+  }
 }

pubspec.yaml

@@ -1,7 +1,7 @@
 name: spotiflac_android
 description: Download Spotify tracks in FLAC from Tidal, Qobuz & Amazon Music
 publish_to: 'none'
-version: 2.0.1+31
+version: 2.0.6+36
 
 environment:
   sdk: ^3.10.0