refactor: cleanup unused code and imports

go_backend/amazon.go

@@ -60,12 +60,10 @@ func amazonArtistsMatch(expectedArtist, foundArtist string) bool {
 		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]
@@ -80,7 +78,6 @@ func amazonArtistsMatch(expectedArtist, foundArtist string) bool {
 		return true
 	}
 
-	// Check if first artist is contained in the other
 	if strings.Contains(expectedFirst, foundFirst) || strings.Contains(foundFirst, expectedFirst) {
 		return true
 	}
@@ -127,7 +124,6 @@ func (a *AmazonDownloader) waitForRateLimit() {
 
 	now := time.Now()
 
-	// Reset counter every minute
 	if now.Sub(a.apiCallResetTime) >= time.Minute {
 		a.apiCallCount = 0
 		a.apiCallResetTime = now
@@ -155,7 +151,6 @@ func (a *AmazonDownloader) waitForRateLimit() {
 		}
 	}
 
-	// Update tracking
 	a.lastAPICallTime = time.Now()
 	a.apiCallCount++
 }
@@ -181,8 +176,6 @@ func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, _ string)
 	for _, region := range a.regions {
 		GoLog("[Amazon] Trying region: %s...\n", region)
 
-		// Build base URL for DoubleDouble service
-		// Decode base64 service URL (same as PC)
 		serviceBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly8=")               // https://
 		serviceDomain, _ := base64.StdEncoding.DecodeString("LmRvdWJsZWRvdWJsZS50b3A=") // .doubledouble.top
 		baseURL := fmt.Sprintf("%s%s%s", string(serviceBase), region, string(serviceDomain))
@@ -301,7 +294,6 @@ func (a *AmazonDownloader) downloadFromDoubleDoubleService(amazonURL, _ string)
 			if status.Status == "done" {
 				fmt.Println("\n[Amazon] Download ready!")
 
-				// Build download URL
 				fileURL := status.URL
 				if strings.HasPrefix(fileURL, "./") {
 					fileURL = fmt.Sprintf("%s/%s", baseURL, fileURL[2:])
@@ -383,7 +375,6 @@ func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath, itemID string)
 	}
 
 	expectedSize := resp.ContentLength
-	// Set total bytes if available
 	if expectedSize > 0 && itemID != "" {
 		SetItemBytesTotal(itemID, expectedSize)
 	}
@@ -393,16 +384,13 @@ func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath, itemID string)
 		return err
 	}
 
-	// Use buffered writer for better performance (256KB buffer)
 	bufWriter := bufio.NewWriterSize(out, 256*1024)
 
-	// Use item progress writer with buffered output
 	var written int64
 	if itemID != "" {
 		pw := NewItemProgressWriter(bufWriter, itemID)
 		written, err = io.Copy(pw, resp.Body)
 	} else {
-		// Fallback: direct copy without progress tracking
 		written, err = io.Copy(bufWriter, resp.Body)
 	}
 
@@ -410,7 +398,6 @@ func (a *AmazonDownloader) DownloadFile(downloadURL, outputPath, itemID string)
 	flushErr := bufWriter.Flush()
 	closeErr := out.Close()
 
-	// Check for any errors
 	if err != nil {
 		os.Remove(outputPath)
 		if isDownloadCancelled(itemID) {
@@ -456,24 +443,19 @@ type AmazonDownloadResult struct {
 func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	downloader := NewAmazonDownloader()
 
-	// Check for existing file first
 	if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
 		return AmazonDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
 	}
 
-	// Get Amazon URL from SongLink
 	songlink := NewSongLinkClient()
 	var availability *TrackAvailability
 	var err error
 
-	// Check if SpotifyID is actually a Deezer ID (format: "deezer:xxxxx")
 	if strings.HasPrefix(req.SpotifyID, "deezer:") {
-		// Extract Deezer ID and use Deezer-based lookup
 		deezerID := strings.TrimPrefix(req.SpotifyID, "deezer:")
 		GoLog("[Amazon] Using Deezer ID for SongLink lookup: %s\n", deezerID)
 		availability, err = songlink.CheckAvailabilityFromDeezer(deezerID)
 	} else if req.SpotifyID != "" {
-		// Use Spotify ID
 		availability, err = songlink.CheckTrackAvailability(req.SpotifyID, req.ISRC)
 	} else {
 		return AmazonDownloadResult{}, fmt.Errorf("no valid Spotify or Deezer ID provided for Amazon lookup")
@@ -487,7 +469,6 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		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 AmazonDownloadResult{}, fmt.Errorf("failed to create output directory: %w", err)
@@ -506,10 +487,8 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		return AmazonDownloadResult{}, fmt.Errorf("artist mismatch: expected '%s', got '%s'", req.ArtistName, artistName)
 	}
 
-	// Log match found
 	GoLog("[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,
 		"artist": req.ArtistName,
@@ -521,7 +500,6 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	filename = sanitizeFilename(filename) + ".flac"
 	outputPath := filepath.Join(req.OutputDir, filename)
 
-	// Check if file already exists
 	if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
 		return AmazonDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
 	}
@@ -552,8 +530,6 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 	// Wait for parallel operations to complete
 	<-parallelDone
 
-	// Set progress to 100% and status to finalizing (before embedding)
-	// This makes the UI show "Finalizing..." while embedding happens
 	if req.ItemID != "" {
 		SetItemProgress(req.ItemID, 1.0, 0, 0)
 		SetItemFinalizing(req.ItemID)
@@ -564,14 +540,11 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		GoLog("[Amazon] DoubleDouble returned: %s - %s\n", artistName, trackName)
 	}
 
-	// Read existing metadata from downloaded file BEFORE embedding
-	// Amazon/DoubleDouble files often have correct track/disc numbers that we should preserve
 	existingMeta, metaErr := ReadMetadata(outputPath)
 	actualTrackNum := req.TrackNumber
 	actualDiscNum := req.DiscNumber
 
 	if metaErr == nil && existingMeta != nil {
-		// Use file metadata if it has valid track/disc numbers and request doesn't have them
 		if existingMeta.TrackNumber > 0 && (req.TrackNumber == 0 || req.TrackNumber == 1) {
 			actualTrackNum = existingMeta.TrackNumber
 			GoLog("[Amazon] Using track number from file: %d (request had: %d)\n", actualTrackNum, req.TrackNumber)
@@ -621,8 +594,6 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 
 	fmt.Println("[Amazon] ✓ Downloaded successfully from Amazon Music")
 
-	// 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 {
 		GoLog("[Amazon] Warning: couldn't read quality from file: %v\n", err)
@@ -630,8 +601,6 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		GoLog("[Amazon] Actual quality: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
 	}
 
-	// Read metadata from file AFTER embedding to get accurate values
-	// This ensures we return what's actually in the file
 	finalMeta, metaReadErr := ReadMetadata(outputPath)
 	if metaReadErr == nil && finalMeta != nil {
 		GoLog("[Amazon] Final metadata from file - Track: %d, Disc: %d, Date: %s\n",
@@ -639,7 +608,6 @@ func downloadFromAmazon(req DownloadRequest) (AmazonDownloadResult, error) {
 		actualTrackNum = finalMeta.TrackNumber
 		actualDiscNum = finalMeta.DiscNumber
 		if finalMeta.Date != "" {
-			// Use date from file if available
 			req.ReleaseDate = finalMeta.Date
 		}
 	}

go_backend/deezer.go

@@ -113,7 +113,6 @@ func (c *DeezerClient) convertTrack(track deezerTrack) TrackMetadata {
 		albumImage = track.Album.Cover
 	}
 
-	// Try to find release date
 	releaseDate := track.ReleaseDate
 	if releaseDate == "" {
 		releaseDate = track.Album.ReleaseDate
@@ -541,7 +540,6 @@ func (c *DeezerClient) SearchByISRC(ctx context.Context, isrc string) (*TrackMet
 		return &result, nil
 	}
 
-	// Check if we got a valid response (ID > 0)
 	if track.ID == 0 {
 		return nil, fmt.Errorf("no track found for ISRC: %s", isrc)
 	}
@@ -564,7 +562,6 @@ func (c *DeezerClient) fetchISRCsParallel(ctx context.Context, tracks []deezerTr
 	result := make(map[string]string)
 	var resultMu sync.Mutex
 
-	// First, check cache for existing ISRCs
 	var tracksToFetch []deezerTrack
 	c.cacheMu.RLock()
 	for _, track := range tracks {
@@ -622,7 +619,6 @@ func (c *DeezerClient) fetchISRCsParallel(ctx context.Context, tracks []deezerTr
 // GetTrackISRC fetches ISRC for a single track (with caching)
 // Use this when you need ISRC for download
 func (c *DeezerClient) GetTrackISRC(ctx context.Context, trackID string) (string, error) {
-	// Check cache first
 	c.cacheMu.RLock()
 	if isrc, ok := c.isrcCache[trackID]; ok {
 		c.cacheMu.RUnlock()

go_backend/duplicate.go

@@ -36,7 +36,6 @@ func GetISRCIndex(outputDir string) *ISRCIndex {
 		return idx
 	}
 
-	// Build new index
 	return buildISRCIndex(outputDir)
 }
 
@@ -56,7 +55,6 @@ func buildISRCIndex(outputDir string) *ISRCIndex {
 	startTime := time.Now()
 	fileCount := 0
 
-	// Walk directory - only check .flac files
 	filepath.Walk(outputDir, func(path string, info os.FileInfo, err error) error {
 		if err != nil || info.IsDir() {
 			return nil
@@ -67,13 +65,11 @@ func buildISRCIndex(outputDir string) *ISRCIndex {
 			return nil
 		}
 
-		// Read ISRC from file
 		metadata, err := ReadMetadata(path)
 		if err != nil || metadata.ISRC == "" {
 			return nil
 		}
 
-		// Store in index (uppercase for case-insensitive matching)
 		idx.index[strings.ToUpper(metadata.ISRC)] = path
 		fileCount++
 		return nil
@@ -82,7 +78,6 @@ func buildISRCIndex(outputDir string) *ISRCIndex {
 	fmt.Printf("[ISRCIndex] Built index for %s: %d files in %v\n", 
 		outputDir, fileCount, time.Since(startTime).Round(time.Millisecond))
 
-	// Cache the index
 	isrcIndexCacheMu.Lock()
 	isrcIndexCache[outputDir] = idx
 	isrcIndexCacheMu.Unlock()
@@ -205,10 +200,8 @@ func CheckFilesExistParallel(outputDir string, tracksJSON string) (string, error
 
 	results := make([]FileExistenceResult, len(tracks))
 
-	// Build ISRC index from output directory (scan once)
 	isrcIdx := GetISRCIndex(outputDir)
 
-	// Check each track against the index (parallel)
 	var wg sync.WaitGroup
 	for i, track := range tracks {
 		wg.Add(1)

go_backend/exports.go

@@ -283,10 +283,8 @@ func DownloadTrack(requestJSON string) (string, error) {
 		return errorResponse(err.Error())
 	}
 
-	// Check if file already 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
@@ -312,7 +310,6 @@ func DownloadTrack(requestJSON string) (string, error) {
 		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
@@ -362,7 +359,6 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 		AddAllowedDownloadDir(req.OutputDir)
 	}
 
-	// Build service order starting with preferred service
 	allServices := []string{"tidal", "qobuz", "amazon"}
 	preferredService := req.Service
 	if preferredService == "" {
@@ -371,7 +367,6 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 
 	GoLog("[DownloadWithFallback] Preferred service from request: '%s'\n", req.Service)
 
-	// Create ordered list: preferred first, then others
 	services := []string{preferredService}
 	for _, s := range allServices {
 		if s != preferredService {
@@ -455,10 +450,8 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 		}
 
 		if err == nil {
-			// Check if file already 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
@@ -484,7 +477,6 @@ func DownloadWithFallback(requestJSON string) (string, error) {
 				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
@@ -567,10 +559,8 @@ func ReadFileMetadata(filePath string) (string, error) {
 		return "", fmt.Errorf("failed to read metadata: %w", err)
 	}
 
-	// Also get audio quality info
 	quality, qualityErr := GetAudioQuality(filePath)
 
-	// Get duration from FLAC stream info
 	duration := 0
 	if qualityErr == nil && quality.SampleRate > 0 && quality.TotalSamples > 0 {
 		duration = int(quality.TotalSamples / int64(quality.SampleRate))
@@ -640,7 +630,6 @@ func PreBuildDuplicateIndex(outputDir string) error {
 }
 
 // InvalidateDuplicateIndex clears the ISRC index cache for a directory
-// Call this when files are deleted or moved
 func InvalidateDuplicateIndex(outputDir string) {
 	InvalidateISRCCache(outputDir)
 }
@@ -703,7 +692,6 @@ func GetLyricsLRC(spotifyID, trackName, artistName string, filePath string) (str
 		return "", err
 	}
 
-	// Convert to LRC format with metadata headers (like PC version)
 	lrcContent := convertToLRCWithMetadata(lyricsData, trackName, artistName)
 	return lrcContent, nil
 }
@@ -740,7 +728,6 @@ func PreWarmTrackCacheJSON(tracksJSON string) (string, error) {
 		return errorResponse("Invalid JSON: " + err.Error())
 	}
 
-	// Convert to PreWarmCacheRequest
 	requests := make([]PreWarmCacheRequest, len(tracks))
 	for i, t := range tracks {
 		requests[i] = PreWarmCacheRequest{
@@ -872,7 +859,6 @@ func SearchDeezerByISRC(isrc string) (string, error) {
 }
 
 // ConvertSpotifyToDeezer converts a Spotify track/album ID to Deezer and fetches metadata
-// This uses SongLink API to find the Deezer equivalent, then fetches from Deezer
 // Useful when Spotify API is rate limited
 func ConvertSpotifyToDeezer(resourceType, spotifyID string) (string, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
@@ -881,7 +867,6 @@ func ConvertSpotifyToDeezer(resourceType, spotifyID string) (string, error) {
 	songlink := NewSongLinkClient()
 	deezerClient := GetDeezerClient()
 
-	// For tracks, we can use SongLink to get Deezer ID
 	if resourceType == "track" {
 		deezerID, err := songlink.GetDeezerIDFromSpotify(spotifyID)
 		if err != nil {
@@ -902,7 +887,6 @@ func ConvertSpotifyToDeezer(resourceType, spotifyID string) (string, error) {
 		return string(jsonBytes), nil
 	}
 
-	// For albums, SongLink also provides mapping
 	if resourceType == "album" {
 		deezerID, err := songlink.GetDeezerAlbumIDFromSpotify(spotifyID)
 		if err != nil {
@@ -947,7 +931,6 @@ func GetSpotifyMetadataWithDeezerFallback(spotifyURL string) (string, error) {
 			return string(jsonBytes), nil
 		}
 
-		// Check if it's a rate limit error
 		errStr := strings.ToLower(err.Error())
 		if !strings.Contains(errStr, "429") && !strings.Contains(errStr, "rate") && !strings.Contains(errStr, "limit") {
 			// Not a rate limit error, return original error
@@ -964,7 +947,6 @@ func GetSpotifyMetadataWithDeezerFallback(spotifyURL string) (string, error) {
 	GoLog("[Fallback] Spotify rate limited for %s, trying Deezer...\n", parsed.Type)
 
 	if parsed.Type == "track" || parsed.Type == "album" {
-		// Convert to Deezer
 		return ConvertSpotifyToDeezer(parsed.Type, parsed.ID)
 	}
 
@@ -1372,7 +1354,6 @@ func IsExtensionAuthenticatedByID(extensionID string) bool {
 		return false
 	}
 
-	// Check if token is expired
 	if state.IsAuthenticated && !state.ExpiresAt.IsZero() && time.Now().After(state.ExpiresAt) {
 		return false
 	}
@@ -1518,7 +1499,6 @@ func CustomSearchWithExtensionJSON(extensionID, query string, optionsJSON string
 		return "", err
 	}
 
-	// Convert to map format for Flutter, ensuring images field is set
 	result := make([]map[string]interface{}, len(tracks))
 	for i, track := range tracks {
 		result[i] = map[string]interface{}{
@@ -1585,12 +1565,10 @@ func HandleURLWithExtensionJSON(url string) (string, error) {
 	result := resultWithID.Result
 	extensionID := resultWithID.ExtensionID
 
-	// Check if result is nil (handler found but returned error)
 	if result == nil {
 		return "", fmt.Errorf("extension %s failed to handle URL", extensionID)
 	}
 
-	// Build response
 	response := map[string]interface{}{
 		"type":         result.Type,
 		"extension_id": extensionID,
@@ -1758,10 +1736,8 @@ func GetAlbumWithExtensionJSON(extensionID, albumID string) (string, error) {
 		return "", fmt.Errorf("album not found")
 	}
 
-	// Convert tracks to map format
 	tracks := make([]map[string]interface{}, len(album.Tracks))
 	for i, track := range album.Tracks {
-		// Use album cover as fallback if track doesn't have its own cover
 		trackCover := track.ResolvedCoverURL()
 		if trackCover == "" {
 			trackCover = album.CoverURL
@@ -1818,7 +1794,6 @@ func GetPlaylistWithExtensionJSON(extensionID, playlistID string) (string, error
 
 	provider := NewExtensionProviderWrapper(ext)
 
-	// Try getPlaylist first, fall back to getAlbum (some extensions use album for playlists)
 	script := fmt.Sprintf(`
 		(function() {
 			if (typeof extension !== 'undefined' && typeof extension.getPlaylist === 'function') {
@@ -1856,10 +1831,8 @@ func GetPlaylistWithExtensionJSON(extensionID, playlistID string) (string, error
 		album.Tracks[i].ProviderID = ext.ID
 	}
 
-	// Convert tracks to map format
 	tracks := make([]map[string]interface{}, len(album.Tracks))
 	for i, track := range album.Tracks {
-		// Use playlist cover as fallback if track doesn't have its own cover
 		trackCover := track.ResolvedCoverURL()
 		if trackCover == "" {
 			trackCover = album.CoverURL
@@ -1922,7 +1895,6 @@ func GetArtistWithExtensionJSON(extensionID, artistID string) (string, error) {
 		return "", fmt.Errorf("artist not found")
 	}
 
-	// Convert albums to map format
 	albums := make([]map[string]interface{}, len(artist.Albums))
 	for i, album := range artist.Albums {
 		albums[i] = map[string]interface{}{

go_backend/extension_manager.go

@@ -92,7 +92,6 @@ func (m *ExtensionManager) SetDirectories(extensionsDir, dataDir string) error {
 	m.extensionsDir = extensionsDir
 	m.dataDir = dataDir
 
-	// Create directories if they don't exist
 	if err := os.MkdirAll(extensionsDir, 0755); err != nil {
 		return fmt.Errorf("failed to create extensions directory: %w", err)
 	}
@@ -117,7 +116,6 @@ func (m *ExtensionManager) LoadExtensionFromFile(filePath string) (*LoadedExtens
 	}
 	defer zipReader.Close()
 
-	// Find and read manifest.json
 	var manifestData []byte
 	var hasIndexJS bool
 	for _, file := range zipReader.File {
@@ -146,13 +144,11 @@ func (m *ExtensionManager) LoadExtensionFromFile(filePath string) (*LoadedExtens
 		return nil, fmt.Errorf("Invalid extension package: index.js not found")
 	}
 
-	// Parse and validate manifest
 	manifest, err := ParseManifest(manifestData)
 	if err != nil {
 		return nil, fmt.Errorf("Invalid extension manifest: %w", err)
 	}
 
-	// Check if extension already loaded - if so, try upgrade (check without holding lock for long)
 	m.mu.RLock()
 	existing, exists := m.extensions[manifest.Name]
 	var existingVersion string
@@ -164,7 +160,6 @@ func (m *ExtensionManager) LoadExtensionFromFile(filePath string) (*LoadedExtens
 	m.mu.RUnlock()
 
 	if exists {
-		// Check if this is an upgrade
 		versionCompare := compareVersions(manifest.Version, existingVersion)
 		if versionCompare > 0 {
 			// This is an upgrade - call UpgradeExtension
@@ -176,16 +171,13 @@ func (m *ExtensionManager) LoadExtensionFromFile(filePath string) (*LoadedExtens
 		}
 	}
 
-	// Now acquire write lock for the rest of the operation
 	m.mu.Lock()
 	defer m.mu.Unlock()
 
-	// Double-check extension wasn't added while we were waiting for lock
 	if _, exists := m.extensions[manifest.Name]; exists {
 		return nil, fmt.Errorf("Extension '%s' was installed by another process", manifest.DisplayName)
 	}
 
-	// Create extension directory
 	extDir := filepath.Join(m.extensionsDir, manifest.Name)
 	if err := os.MkdirAll(extDir, 0755); err != nil {
 		return nil, fmt.Errorf("failed to create extension directory: %w", err)
@@ -206,19 +198,16 @@ func (m *ExtensionManager) LoadExtensionFromFile(filePath string) (*LoadedExtens
 		}
 		destPath := filepath.Join(extDir, relPath)
 
-		// Create parent directories if needed
 		destDir := filepath.Dir(destPath)
 		if err := os.MkdirAll(destDir, 0755); err != nil {
 			return nil, fmt.Errorf("failed to create directory %s: %w", destDir, err)
 		}
 
-		// Create destination file
 		destFile, err := os.Create(destPath)
 		if err != nil {
 			return nil, fmt.Errorf("failed to create file %s: %w", destPath, err)
 		}
 
-		// Copy content
 		srcFile, err := file.Open()
 		if err != nil {
 			destFile.Close()
@@ -233,13 +222,11 @@ func (m *ExtensionManager) LoadExtensionFromFile(filePath string) (*LoadedExtens
 		}
 	}
 
-	// Create data directory for extension
 	extDataDir := filepath.Join(m.dataDir, manifest.Name)
 	if err := os.MkdirAll(extDataDir, 0755); err != nil {
 		return nil, fmt.Errorf("failed to create extension data directory: %w", err)
 	}
 
-	// Create loaded extension
 	ext := &LoadedExtension{
 		ID:        manifest.Name,
 		Manifest:  manifest,
@@ -263,23 +250,19 @@ func (m *ExtensionManager) LoadExtensionFromFile(filePath string) (*LoadedExtens
 
 // initializeVM creates and initializes the Goja VM for an extension
 func (m *ExtensionManager) initializeVM(ext *LoadedExtension) error {
-	// Create new Goja runtime
 	vm := goja.New()
 	ext.VM = vm
 
-	// Read index.js
 	indexPath := filepath.Join(ext.SourceDir, "index.js")
 	jsCode, err := os.ReadFile(indexPath)
 	if err != nil {
 		return fmt.Errorf("failed to read index.js: %w", err)
 	}
 
-	// Create extension runtime and register sandboxed APIs
 	runtime := NewExtensionRuntime(ext)
 	runtime.RegisterAPIs(vm)
 	runtime.RegisterGoBackendAPIs(vm)
 
-	// Set up console.log for debugging
 	console := vm.NewObject()
 	console.Set("log", func(call goja.FunctionCall) goja.Value {
 		args := make([]interface{}, len(call.Arguments))
@@ -291,12 +274,10 @@ func (m *ExtensionManager) initializeVM(ext *LoadedExtension) error {
 	})
 	vm.Set("console", console)
 
-	// Set up registerExtension function
 	var registeredExtension goja.Value
 	vm.Set("registerExtension", func(call goja.FunctionCall) goja.Value {
 		if len(call.Arguments) > 0 {
 			registeredExtension = call.Arguments[0]
-			// Also set it as global 'extension' variable for later access
 			vm.Set("extension", call.Arguments[0])
 		}
 		return goja.Undefined()
@@ -406,7 +387,6 @@ func (m *ExtensionManager) LoadExtensionsFromDirectory(dirPath string) ([]string
 
 	for _, entry := range entries {
 		if entry.IsDir() {
-			// Check if it's an extracted extension directory
 			manifestPath := filepath.Join(dirPath, entry.Name(), "manifest.json")
 			if _, err := os.Stat(manifestPath); err == nil {
 				ext, err := m.loadExtensionFromDirectory(filepath.Join(dirPath, entry.Name()))
@@ -418,7 +398,6 @@ func (m *ExtensionManager) LoadExtensionsFromDirectory(dirPath string) ([]string
 				}
 			}
 		} else if strings.HasSuffix(strings.ToLower(entry.Name()), ".spotiflac-ext") {
-			// Load from package file
 			ext, err := m.LoadExtensionFromFile(filepath.Join(dirPath, entry.Name()))
 			if err != nil {
 				GoLog("[Extension] Failed to load %s: %v\n", entry.Name(), err)
@@ -437,7 +416,6 @@ func (m *ExtensionManager) loadExtensionFromDirectory(dirPath string) (*LoadedEx
 	m.mu.Lock()
 	defer m.mu.Unlock()
 
-	// Read manifest
 	manifestPath := filepath.Join(dirPath, "manifest.json")
 	manifestData, err := os.ReadFile(manifestPath)
 	if err != nil {
@@ -450,25 +428,21 @@ func (m *ExtensionManager) loadExtensionFromDirectory(dirPath string) (*LoadedEx
 		return nil, fmt.Errorf("Invalid extension manifest: %w", err)
 	}
 
-	// Check if index.js exists
 	indexPath := filepath.Join(dirPath, "index.js")
 	if _, err := os.Stat(indexPath); os.IsNotExist(err) {
 		return nil, fmt.Errorf("Extension is missing index.js file")
 	}
 
-	// Check if extension already loaded - skip silently (for directory loading on startup)
 	if existing, exists := m.extensions[manifest.Name]; exists {
 		GoLog("[Extension] Extension '%s' already loaded, skipping\n", manifest.DisplayName)
 		return existing, nil
 	}
 
-	// Create data directory for extension
 	extDataDir := filepath.Join(m.dataDir, manifest.Name)
 	if err := os.MkdirAll(extDataDir, 0755); err != nil {
 		return nil, fmt.Errorf("failed to create extension data directory: %w", err)
 	}
 
-	// Create loaded extension
 	ext := &LoadedExtension{
 		ID:        manifest.Name,
 		Manifest:  manifest,
@@ -541,7 +515,6 @@ func (m *ExtensionManager) UpgradeExtension(filePath string) (*LoadedExtension,
 	}
 	defer zipReader.Close()
 
-	// Find and read manifest.json
 	var manifestData []byte
 	var hasIndexJS bool
 	for _, file := range zipReader.File {
@@ -570,13 +543,11 @@ func (m *ExtensionManager) UpgradeExtension(filePath string) (*LoadedExtension,
 		return nil, fmt.Errorf("Invalid extension package: index.js not found")
 	}
 
-	// Parse and validate manifest
 	newManifest, err := ParseManifest(manifestData)
 	if err != nil {
 		return nil, fmt.Errorf("Invalid extension manifest: %w", err)
 	}
 
-	// Check if extension exists
 	m.mu.RLock()
 	existing, exists := m.extensions[newManifest.Name]
 	m.mu.RUnlock()
@@ -612,19 +583,15 @@ func (m *ExtensionManager) UpgradeExtension(filePath string) (*LoadedExtension,
 		}
 	}
 
-	// Recreate extension directory
 	if err := os.MkdirAll(extDir, 0755); err != nil {
 		return nil, fmt.Errorf("failed to create extension directory: %w", err)
 	}
 
-	// Extract all files from new package (preserving directory structure)
 	for _, file := range zipReader.File {
 		if file.FileInfo().IsDir() {
 			continue
 		}
 
-		// Preserve relative path within the zip (support subdirectories)
-		// Clean the path to prevent path traversal attacks
 		relPath := filepath.Clean(file.Name)
 		if strings.HasPrefix(relPath, "..") || filepath.IsAbs(relPath) {
 			GoLog("[Extension] Skipping unsafe path in archive: %s\n", file.Name)
@@ -632,19 +599,16 @@ func (m *ExtensionManager) UpgradeExtension(filePath string) (*LoadedExtension,
 		}
 		destPath := filepath.Join(extDir, relPath)
 
-		// Create parent directories if needed
 		destDir := filepath.Dir(destPath)
 		if err := os.MkdirAll(destDir, 0755); err != nil {
 			return nil, fmt.Errorf("failed to create directory %s: %w", destDir, err)
 		}
 
-		// Create destination file
 		destFile, err := os.Create(destPath)
 		if err != nil {
 			return nil, fmt.Errorf("failed to create file %s: %w", destPath, err)
 		}
 
-		// Copy content
 		srcFile, err := file.Open()
 		if err != nil {
 			destFile.Close()
@@ -659,7 +623,6 @@ func (m *ExtensionManager) UpgradeExtension(filePath string) (*LoadedExtension,
 		}
 	}
 
-	// Create new loaded extension (reusing data directory, preserving enabled state)
 	ext := &LoadedExtension{
 		ID:        newManifest.Name,
 		Manifest:  newManifest,
@@ -708,7 +671,6 @@ func (m *ExtensionManager) checkExtensionUpgradeInternal(filePath string) (*Exte
 	}
 	defer zipReader.Close()
 
-	// Find and read manifest.json
 	var manifestData []byte
 	for _, file := range zipReader.File {
 		name := filepath.Base(file.Name)
@@ -730,13 +692,11 @@ func (m *ExtensionManager) checkExtensionUpgradeInternal(filePath string) (*Exte
 		return nil, fmt.Errorf("manifest.json not found")
 	}
 
-	// Parse manifest
 	newManifest, err := ParseManifest(manifestData)
 	if err != nil {
 		return nil, fmt.Errorf("Invalid manifest: %w", err)
 	}
 
-	// Check if extension exists
 	m.mu.RLock()
 	existing, exists := m.extensions[newManifest.Name]
 	m.mu.RUnlock()
@@ -752,7 +712,6 @@ func (m *ExtensionManager) checkExtensionUpgradeInternal(filePath string) (*Exte
 		info.CurrentVersion = ""
 		info.CanUpgrade = false
 	} else {
-		// Compare versions
 		info.CurrentVersion = existing.Manifest.Version
 		info.CanUpgrade = compareVersions(newManifest.Version, existing.Manifest.Version) > 0
 	}
@@ -805,7 +764,6 @@ func (m *ExtensionManager) GetInstalledExtensionsJSON() (string, error) {
 
 	infos := make([]ExtensionInfo, len(extensions))
 	for i, ext := range extensions {
-		// Build permissions list
 		permissions := []string{}
 		for _, domain := range ext.Manifest.Permissions.Network {
 			permissions = append(permissions, "network:"+domain)
@@ -822,7 +780,6 @@ func (m *ExtensionManager) GetInstalledExtensionsJSON() (string, error) {
 			status = "disabled"
 		}
 
-		// Check for icon file
 		iconPath := ""
 		if ext.Manifest.Icon != "" && ext.SourceDir != "" {
 			possibleIcon := filepath.Join(ext.SourceDir, ext.Manifest.Icon)
@@ -830,7 +787,6 @@ func (m *ExtensionManager) GetInstalledExtensionsJSON() (string, error) {
 				iconPath = possibleIcon
 			}
 		}
-		// Fallback: check for icon.png if not specified in manifest
 		if iconPath == "" && ext.SourceDir != "" {
 			possibleIcon := filepath.Join(ext.SourceDir, "icon.png")
 			if _, err := os.Stat(possibleIcon); err == nil {
@@ -887,13 +843,11 @@ func (m *ExtensionManager) InitializeExtension(extensionID string, settings map[
 		return fmt.Errorf("Extension failed to load. Please reinstall the extension")
 	}
 
-	// Convert settings to JSON for passing to JS
 	settingsJSON, err := json.Marshal(settings)
 	if err != nil {
 		return fmt.Errorf("Failed to save settings")
 	}
 
-	// Call initialize function
 	script := fmt.Sprintf(`
 		(function() {
 			var settings = %s;
@@ -917,7 +871,6 @@ func (m *ExtensionManager) InitializeExtension(extensionID string, settings map[
 		return err
 	}
 
-	// Check result
 	if result != nil && !goja.IsUndefined(result) {
 		exported := result.Export()
 		if resultMap, ok := exported.(map[string]interface{}); ok {
@@ -973,7 +926,6 @@ func (m *ExtensionManager) CleanupExtension(extensionID string) error {
 		return err
 	}
 
-	// Check result
 	if result != nil && !goja.IsUndefined(result) {
 		exported := result.Export()
 		if resultMap, ok := exported.(map[string]interface{}); ok {

go_backend/extension_providers.go

@@ -189,7 +189,6 @@ func (p *ExtensionProviderWrapper) SearchTracks(query string, limit int) (*ExtSe
 		}
 	}
 
-	// Set provider ID on all tracks
 	for i := range searchResult.Tracks {
 		searchResult.Tracks[i].ProviderID = p.extension.ID
 	}
@@ -737,12 +736,10 @@ func DownloadWithExtensionFallback(req DownloadRequest) (*DownloadResponse, erro
 
 			enrichedTrack, err := provider.EnrichTrack(trackMeta)
 			if err == nil && enrichedTrack != nil {
-				// Update request with enriched data
 				if enrichedTrack.ISRC != "" && enrichedTrack.ISRC != req.ISRC {
 					GoLog("[DownloadWithExtensionFallback] ISRC enriched: %s -> %s\n", req.ISRC, enrichedTrack.ISRC)
 					req.ISRC = enrichedTrack.ISRC
 				}
-				// Update service-specific IDs from Odesli enrichment
 				if enrichedTrack.TidalID != "" {
 					GoLog("[DownloadWithExtensionFallback] Tidal ID from Odesli: %s\n", enrichedTrack.TidalID)
 					req.TidalID = enrichedTrack.TidalID
@@ -755,7 +752,6 @@ func DownloadWithExtensionFallback(req DownloadRequest) (*DownloadResponse, erro
 					GoLog("[DownloadWithExtensionFallback] Deezer ID from Odesli: %s\n", enrichedTrack.DeezerID)
 					req.DeezerID = enrichedTrack.DeezerID
 				}
-				// Can also update other fields if needed
 				if enrichedTrack.Name != "" {
 					req.TrackName = enrichedTrack.Name
 				}
@@ -772,7 +768,6 @@ func DownloadWithExtensionFallback(req DownloadRequest) (*DownloadResponse, erro
 
 		ext, err := extManager.GetExtension(req.Source)
 		if err == nil && ext.Enabled && ext.Error == "" && ext.Manifest.IsDownloadProvider() {
-			// Check if this extension wants to skip built-in fallback
 			skipBuiltIn = ext.Manifest.SkipBuiltInFallback
 
 			provider := NewExtensionProviderWrapper(ext)
@@ -783,7 +778,6 @@ func DownloadWithExtensionFallback(req DownloadRequest) (*DownloadResponse, erro
 
 			GoLog("[DownloadWithExtensionFallback] Downloading from source extension with trackID: %s (skipBuiltInFallback: %v)\n", trackID, skipBuiltIn)
 
-			// Build output path
 			outputPath := buildOutputPath(req)
 
 			// Download directly using the track ID from the extension
@@ -916,7 +910,6 @@ func DownloadWithExtensionFallback(req DownloadRequest) (*DownloadResponse, erro
 
 			provider := NewExtensionProviderWrapper(ext)
 
-			// Check availability first
 			availability, err := provider.CheckAvailability(req.ISRC, req.TrackName, req.ArtistName)
 			if err != nil || !availability.Available {
 				GoLog("[DownloadWithExtensionFallback] %s: not available\n", providerID)
@@ -926,12 +919,9 @@ func DownloadWithExtensionFallback(req DownloadRequest) (*DownloadResponse, erro
 				continue
 			}
 
-			// Build output path
 			outputPath := buildOutputPath(req)
 
-			// Download
 			result, err := provider.Download(availability.TrackID, req.Quality, outputPath, func(percent int) {
-				// Update progress
 				if req.ItemID != "" {
 					SetItemProgress(req.ItemID, float64(percent), 0, 0)
 				}
@@ -1171,7 +1161,6 @@ func (p *ExtensionProviderWrapper) CustomSearch(query string, options map[string
 		tracks = []ExtTrackMetadata{}
 	}
 
-	// Set provider ID on all tracks
 	for i := range tracks {
 		tracks[i].ProviderID = p.extension.ID
 	}
@@ -1255,7 +1244,6 @@ func (p *ExtensionProviderWrapper) HandleURL(url string) (*ExtURLHandleResult, e
 				handleResult.Artist.Albums[i].Tracks[j].ProviderID = p.extension.ID
 			}
 		}
-		// Set provider ID on top tracks
 		for i := range handleResult.Artist.TopTracks {
 			handleResult.Artist.TopTracks[i].ProviderID = p.extension.ID
 		}
@@ -1493,12 +1481,10 @@ func (m *ExtensionManager) RunPostProcessing(filePath string, metadata map[strin
 	for _, provider := range providers {
 		hooks := provider.extension.Manifest.GetPostProcessingHooks()
 		for _, hook := range hooks {
-			// Check if hook is enabled (TODO: check user settings)
 			if !hook.DefaultEnabled {
 				continue
 			}
 
-			// Check if format is supported
 			ext := strings.ToLower(filepath.Ext(currentPath))
 			if len(hook.SupportedFormats) > 0 {
 				supported := false

go_backend/logbuffer.go

@@ -73,12 +73,10 @@ func (lb *LogBuffer) Add(level, tag, message string) {
 	}
 
 	if len(lb.entries) >= lb.maxSize {
-		// Remove oldest entry
 		lb.entries = lb.entries[1:]
 	}
 	lb.entries = append(lb.entries, entry)
 
-	// Also print to logcat for debugging
 	fmt.Printf("[%s] %s\n", tag, message)
 }
 

go_backend/metadata.go

@@ -51,7 +51,6 @@ func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
 		cmt = flacvorbis.New()
 	}
 
-	// Set metadata fields
 	setComment(cmt, "TITLE", metadata.Title)
 	setComment(cmt, "ARTIST", metadata.Artist)
 	setComment(cmt, "ALBUM", metadata.Album)
@@ -83,7 +82,6 @@ func EmbedMetadata(filePath string, metadata Metadata, coverPath string) error {
 		setComment(cmt, "UNSYNCEDLYRICS", metadata.Lyrics)
 	}
 
-	// Update or add vorbis comment block
 	cmtBlock := cmt.Marshal()
 	if cmtIdx >= 0 {
 		f.Meta[cmtIdx] = &cmtBlock
@@ -151,7 +149,6 @@ func EmbedMetadataWithCoverData(filePath string, metadata Metadata, coverData []
 		cmt = flacvorbis.New()
 	}
 
-	// Set metadata fields
 	setComment(cmt, "TITLE", metadata.Title)
 	setComment(cmt, "ARTIST", metadata.Artist)
 	setComment(cmt, "ALBUM", metadata.Album)
@@ -183,7 +180,6 @@ func EmbedMetadataWithCoverData(filePath string, metadata Metadata, coverData []
 		setComment(cmt, "UNSYNCEDLYRICS", metadata.Lyrics)
 	}
 
-	// Update or add vorbis comment block
 	cmtBlock := cmt.Marshal()
 	if cmtIdx >= 0 {
 		f.Meta[cmtIdx] = &cmtBlock
@@ -309,7 +305,6 @@ func getComment(cmt *flacvorbis.MetaDataBlockVorbisComment, key string) string {
 	return ""
 }
 
-// fileExists checks if a file exists
 func fileExists(path string) bool {
 	_, err := os.Stat(path)
 	return err == nil
@@ -367,13 +362,11 @@ func ExtractLyrics(filePath string) (string, error) {
 				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
@@ -406,10 +399,7 @@ func GetAudioQuality(filePath string) (AudioQuality, error) {
 		return AudioQuality{}, fmt.Errorf("failed to read marker: %w", err)
 	}
 
-	// Check if it's a FLAC file
 	if string(marker) == "fLaC" {
-		// Continue reading FLAC metadata
-		// Read metadata block header (4 bytes)
 		header := make([]byte, 4)
 		if _, err := file.Read(header); err != nil {
 			return AudioQuality{}, fmt.Errorf("failed to read header: %w", err)
@@ -420,7 +410,6 @@ func GetAudioQuality(filePath string) (AudioQuality, error) {
 			return AudioQuality{}, fmt.Errorf("first block is not STREAMINFO")
 		}
 
-		// Read STREAMINFO block (34 bytes minimum)
 		streamInfo := make([]byte, 34)
 		if _, err := file.Read(streamInfo); err != nil {
 			return AudioQuality{}, fmt.Errorf("failed to read STREAMINFO: %w", err)
@@ -468,7 +457,6 @@ func EmbedM4AMetadata(filePath string, metadata Metadata, coverData []byte) erro
 		return fmt.Errorf("failed to read M4A file: %w", err)
 	}
 
-	// Find moov atom position
 	moovPos := findAtom(data, "moov", 0)
 	if moovPos < 0 {
 		return fmt.Errorf("moov atom not found in M4A file")
@@ -481,7 +469,6 @@ func EmbedM4AMetadata(filePath string, metadata Metadata, coverData []byte) erro
 
 	var newData []byte
 	if udtaPos >= 0 && udtaPos < moovPos+moovSize {
-		// udta exists, find meta inside it or replace
 		udtaSize := int(uint32(data[udtaPos])<<24 | uint32(data[udtaPos+1])<<16 | uint32(data[udtaPos+2])<<8 | uint32(data[udtaPos+3]))
 		metaPos := findAtom(data, "meta", udtaPos+8)
 
@@ -522,7 +509,6 @@ func EmbedM4AMetadata(filePath string, metadata Metadata, coverData []byte) erro
 		newData = append(newData, data[insertPos:]...)
 	}
 
-	// Update moov size
 	newMoovSize := moovSize + len(newData) - len(data)
 	newData[moovPos] = byte(newMoovSize >> 24)
 	newData[moovPos+1] = byte(newMoovSize >> 16)
@@ -557,52 +543,42 @@ func findAtom(data []byte, name string, offset int) int {
 func buildMetaAtom(metadata Metadata, coverData []byte) []byte {
 	var ilst []byte
 
-	// ©nam - Title
 	if metadata.Title != "" {
 		ilst = append(ilst, buildTextAtom("©nam", metadata.Title)...)
 	}
 
-	// ©ART - Artist
 	if metadata.Artist != "" {
 		ilst = append(ilst, buildTextAtom("©ART", metadata.Artist)...)
 	}
 
-	// ©alb - Album
 	if metadata.Album != "" {
 		ilst = append(ilst, buildTextAtom("©alb", metadata.Album)...)
 	}
 
-	// aART - Album Artist
 	if metadata.AlbumArtist != "" {
 		ilst = append(ilst, buildTextAtom("aART", metadata.AlbumArtist)...)
 	}
 
-	// ©day - Year/Date
 	if metadata.Date != "" {
 		ilst = append(ilst, buildTextAtom("©day", metadata.Date)...)
 	}
 
-	// trkn - Track Number
 	if metadata.TrackNumber > 0 {
 		ilst = append(ilst, buildTrackNumberAtom(metadata.TrackNumber, metadata.TotalTracks)...)
 	}
 
-	// disk - Disc Number
 	if metadata.DiscNumber > 0 {
 		ilst = append(ilst, buildDiscNumberAtom(metadata.DiscNumber, 0)...)
 	}
 
-	// ©lyr - Lyrics
 	if metadata.Lyrics != "" {
 		ilst = append(ilst, buildTextAtom("©lyr", metadata.Lyrics)...)
 	}
 
-	// covr - Cover Art
 	if len(coverData) > 0 {
 		ilst = append(ilst, buildCoverAtom(coverData)...)
 	}
 
-	// Build ilst atom
 	ilstSize := 8 + len(ilst)
 	ilstAtom := make([]byte, 4)
 	ilstAtom[0] = byte(ilstSize >> 24)
@@ -624,7 +600,6 @@ func buildMetaAtom(metadata Metadata, coverData []byte) []byte {
 		0, // null terminator
 	}
 
-	// Build meta atom
 	metaContent := append([]byte{0, 0, 0, 0}, hdlr...) // version + flags + hdlr
 	metaContent = append(metaContent, ilstAtom...)
 
@@ -644,7 +619,6 @@ func buildMetaAtom(metadata Metadata, coverData []byte) []byte {
 func buildTextAtom(name, value string) []byte {
 	valueBytes := []byte(value)
 
-	// data atom
 	dataSize := 16 + len(valueBytes)
 	dataAtom := make([]byte, 4)
 	dataAtom[0] = byte(dataSize >> 24)
@@ -656,7 +630,6 @@ func buildTextAtom(name, value string) []byte {
 	dataAtom = append(dataAtom, 0, 0, 0, 0) // locale
 	dataAtom = append(dataAtom, valueBytes...)
 
-	// container atom
 	atomSize := 8 + len(dataAtom)
 	atom := make([]byte, 4)
 	atom[0] = byte(atomSize >> 24)
@@ -671,7 +644,6 @@ func buildTextAtom(name, value string) []byte {
 
 // buildTrackNumberAtom builds trkn atom
 func buildTrackNumberAtom(track, total int) []byte {
-	// data atom with track number
 	dataAtom := []byte{
 		0, 0, 0, 24, // size
 		'd', 'a', 't', 'a',
@@ -683,7 +655,6 @@ func buildTrackNumberAtom(track, total int) []byte {
 		0, 0, // padding
 	}
 
-	// trkn atom
 	atomSize := 8 + len(dataAtom)
 	atom := make([]byte, 4)
 	atom[0] = byte(atomSize >> 24)
@@ -698,7 +669,6 @@ func buildTrackNumberAtom(track, total int) []byte {
 
 // buildDiscNumberAtom builds disk atom
 func buildDiscNumberAtom(disc, total int) []byte {
-	// data atom with disc number
 	dataAtom := []byte{
 		0, 0, 0, 22, // size
 		'd', 'a', 't', 'a',
@@ -709,7 +679,6 @@ func buildDiscNumberAtom(disc, total int) []byte {
 		byte(total >> 8), byte(total), // total discs
 	}
 
-	// disk atom
 	atomSize := 8 + len(dataAtom)
 	atom := make([]byte, 4)
 	atom[0] = byte(atomSize >> 24)
@@ -724,13 +693,11 @@ func buildDiscNumberAtom(disc, total int) []byte {
 
 // buildCoverAtom builds covr atom with image data
 func buildCoverAtom(coverData []byte) []byte {
-	// Detect image type (JPEG = 13, PNG = 14)
 	imageType := byte(13) // default JPEG
 	if len(coverData) > 8 && coverData[0] == 0x89 && coverData[1] == 'P' && coverData[2] == 'N' && coverData[3] == 'G' {
 		imageType = 14 // PNG
 	}
 
-	// data atom
 	dataSize := 16 + len(coverData)
 	dataAtom := make([]byte, 4)
 	dataAtom[0] = byte(dataSize >> 24)
@@ -742,7 +709,6 @@ func buildCoverAtom(coverData []byte) []byte {
 	dataAtom = append(dataAtom, 0, 0, 0, 0)         // locale
 	dataAtom = append(dataAtom, coverData...)
 
-	// covr atom
 	atomSize := 8 + len(dataAtom)
 	atom := make([]byte, 4)
 	atom[0] = byte(atomSize >> 24)
@@ -762,7 +728,6 @@ func GetM4AQuality(filePath string) (AudioQuality, error) {
 		return AudioQuality{}, fmt.Errorf("failed to read M4A file: %w", err)
 	}
 
-	// Find moov -> trak -> mdia -> minf -> stbl -> stsd
 	moovPos := findAtom(data, "moov", 0)
 	if moovPos < 0 {
 		return AudioQuality{}, fmt.Errorf("moov atom not found")

go_backend/progress.go

@@ -49,7 +49,6 @@ func getProgress() DownloadProgress {
 	multiMu.RLock()
 	defer multiMu.RUnlock()
 
-	// Find first active item
 	for _, item := range multiProgress.Items {
 		return DownloadProgress{
 			CurrentFile:   item.ItemID,
@@ -249,10 +248,7 @@ func (pw *ItemProgressWriter) Write(p []byte) (int, error) {
 	}
 	pw.current += int64(n)
 
-	// Update progress when we've received at least 64KB since last update
-	// Also update on first write to show download has started
 	if pw.lastReported == 0 || pw.current-pw.lastReported >= progressUpdateThreshold {
-		// Calculate speed (MB/s) based on bytes received since last update
 		now := time.Now()
 		elapsed := now.Sub(pw.lastTime).Seconds()
 		var speedMBps float64

go_backend/qobuz.go

@@ -855,7 +855,6 @@ func (q *QobuzDownloader) GetDownloadURL(trackID int64, quality string) (string,
 		return "", fmt.Errorf("no Qobuz API available")
 	}
 
-	// Use parallel approach - request from all APIs simultaneously
 	_, downloadURL, err := getQobuzDownloadURLParallel(apis, trackID, quality)
 	if err != nil {
 		return "", err
@@ -899,7 +898,6 @@ func (q *QobuzDownloader) DownloadFile(downloadURL, outputPath, itemID string) e
 	}
 
 	expectedSize := resp.ContentLength
-	// Set total bytes if available
 	if expectedSize > 0 && itemID != "" {
 		SetItemBytesTotal(itemID, expectedSize)
 	}
@@ -909,16 +907,13 @@ func (q *QobuzDownloader) DownloadFile(downloadURL, outputPath, itemID string) e
 		return err
 	}
 
-	// Use buffered writer for better performance (256KB buffer)
 	bufWriter := bufio.NewWriterSize(out, 256*1024)
 
-	// Use item progress writer with buffered output
 	var written int64
 	if itemID != "" {
 		progressWriter := NewItemProgressWriter(bufWriter, itemID)
 		written, err = io.Copy(progressWriter, resp.Body)
 	} else {
-		// Fallback: direct copy without progress tracking
 		written, err = io.Copy(bufWriter, resp.Body)
 	}
 
@@ -926,7 +921,6 @@ func (q *QobuzDownloader) DownloadFile(downloadURL, outputPath, itemID string) e
 	flushErr := bufWriter.Flush()
 	closeErr := out.Close()
 
-	// Check for any errors
 	if err != nil {
 		os.Remove(outputPath)
 		if isDownloadCancelled(itemID) {
@@ -970,18 +964,15 @@ type QobuzDownloadResult struct {
 func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 	downloader := NewQobuzDownloader()
 
-	// Check for existing file first
 	if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
 		return QobuzDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
 	}
 
-	// Convert expected duration from ms to seconds
 	expectedDurationSec := req.DurationMS / 1000
 
 	var track *QobuzTrack
 	var err error
 
-	// STRATEGY 0: Use pre-fetched Qobuz ID from Odesli enrichment (highest priority)
 	if req.QobuzID != "" {
 		GoLog("[Qobuz] Using Qobuz ID from Odesli enrichment: %s\n", req.QobuzID)
 		var trackID int64
@@ -1052,7 +1043,6 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		GetTrackIDCache().SetQobuz(req.ISRC, track.ID)
 	}
 
-	// Build filename
 	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]interface{}{
 		"title":  req.TrackName,
 		"artist": req.ArtistName,
@@ -1064,7 +1054,6 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 	filename = sanitizeFilename(filename) + ".flac"
 	outputPath := filepath.Join(req.OutputDir, filename)
 
-	// Check if file already exists
 	if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
 		return QobuzDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
 	}
@@ -1083,12 +1072,10 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 	}
 	GoLog("[Qobuz] Using quality: %s (mapped from %s)\n", qobuzQuality, req.Quality)
 
-	// Get actual quality from track metadata
 	actualBitDepth := track.MaximumBitDepth
 	actualSampleRate := int(track.MaximumSamplingRate * 1000) // Convert kHz to Hz
 	GoLog("[Qobuz] Actual quality: %d-bit/%.1fkHz\n", actualBitDepth, track.MaximumSamplingRate)
 
-	// Get download URL using parallel API requests
 	downloadURL, err := downloader.GetDownloadURL(track.ID, qobuzQuality)
 	if err != nil {
 		return QobuzDownloadResult{}, fmt.Errorf("failed to get download URL: %w", err)
@@ -1120,16 +1107,11 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 	// Wait for parallel operations to complete
 	<-parallelDone
 
-	// Set progress to 100% and status to finalizing (before embedding)
-	// This makes the UI show "Finalizing..." while embedding happens
 	if req.ItemID != "" {
 		SetItemProgress(req.ItemID, 1.0, 0, 0)
 		SetItemFinalizing(req.ItemID)
 	}
 
-	// Embed metadata using parallel-fetched cover data
-	// Use metadata from the actual Qobuz track found (more accurate than request) but prefer
-	// requested Album Name to avoid ISRC version mismatches (e.g. Compilations vs Original)
 	albumName := track.Album.Title
 	if req.AlbumName != "" {
 		albumName = req.AlbumName
@@ -1147,7 +1129,6 @@ func downloadFromQobuz(req DownloadRequest) (QobuzDownloadResult, error) {
 		ISRC:        track.ISRC,
 	}
 
-	// Use cover data from parallel fetch
 	var coverData []byte
 	if parallelResult != nil && parallelResult.CoverData != nil {
 		coverData = parallelResult.CoverData

go_backend/spotify.go

@@ -89,7 +89,6 @@ func HasSpotifyCredentials() bool {
 		return true
 	}
 
-	// Check environment variables
 	if os.Getenv("SPOTIFY_CLIENT_ID") != "" && os.Getenv("SPOTIFY_CLIENT_SECRET") != "" {
 		return true
 	}
@@ -102,12 +101,10 @@ func getCredentials() (string, string, error) {
 	credentialsMu.RLock()
 	defer credentialsMu.RUnlock()
 
-	// Check custom credentials first
 	if customClientID != "" && customClientSecret != "" {
 		return customClientID, customClientSecret, nil
 	}
 
-	// Check environment variables
 	clientID := os.Getenv("SPOTIFY_CLIENT_ID")
 	clientSecret := os.Getenv("SPOTIFY_CLIENT_SECRET")
 
@@ -393,10 +390,8 @@ func (c *SpotifyMetadataClient) SearchTracks(ctx context.Context, query string,
 
 // SearchAll searches for tracks and artists on Spotify
 func (c *SpotifyMetadataClient) SearchAll(ctx context.Context, query string, trackLimit, artistLimit int) (*SearchAllResult, error) {
-	// Create cache key
 	cacheKey := fmt.Sprintf("all:%s:%d:%d", query, trackLimit, artistLimit)
 
-	// Check cache first
 	c.cacheMu.RLock()
 	if entry, ok := c.searchCache[cacheKey]; ok && !entry.isExpired() {
 		c.cacheMu.RUnlock()
@@ -510,7 +505,6 @@ func (c *SpotifyMetadataClient) fetchTrack(ctx context.Context, trackID, token s
 }
 
 func (c *SpotifyMetadataClient) fetchAlbum(ctx context.Context, albumID, token string) (*AlbumResponsePayload, error) {
-	// Check cache first
 	c.cacheMu.RLock()
 	if entry, ok := c.albumCache[albumID]; ok && !entry.isExpired() {
 		c.cacheMu.RUnlock()
@@ -768,7 +762,6 @@ func (c *SpotifyMetadataClient) fetchPlaylist(ctx context.Context, playlistID, t
 }
 
 func (c *SpotifyMetadataClient) fetchArtist(ctx context.Context, artistID, token string) (*ArtistResponsePayload, error) {
-	// Check cache first
 	c.cacheMu.RLock()
 	if entry, ok := c.artistCache[artistID]; ok && !entry.isExpired() {
 		c.cacheMu.RUnlock()

go_backend/tidal.go

@@ -118,7 +118,6 @@ func NewTidalDownloader() *TidalDownloader {
 			clientSecret: string(clientSecret),
 		}
 
-		// Get first available API
 		apis := globalTidalDownloader.GetAvailableAPIs()
 		if len(apis) > 0 {
 			globalTidalDownloader.apiURL = apis[0]
@@ -1451,7 +1450,6 @@ func isLatinScript(s string) bool {
 func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 	downloader := NewTidalDownloader()
 
-	// Check for existing file first
 	if existingFile, exists := checkISRCExistsInternal(req.OutputDir, req.ISRC); exists {
 		return TidalDownloadResult{FilePath: "EXISTS:" + existingFile}, nil
 	}
@@ -1519,7 +1517,6 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		var tidalURL string
 		var slErr error
 
-		// Check if SpotifyID is actually a Deezer ID (format: "deezer:xxxxx")
 		if strings.HasPrefix(req.SpotifyID, "deezer:") {
 			deezerID := strings.TrimPrefix(req.SpotifyID, "deezer:")
 			GoLog("[Tidal] Using Deezer ID for SongLink lookup: %s\n", deezerID)
@@ -1530,12 +1527,10 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		}
 
 		if slErr == nil && tidalURL != "" {
-			// Extract track ID and get track info
 			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
@@ -1545,7 +1540,6 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 						tidalArtist = strings.Join(artistNames, ", ")
 					}
 
-					// Verify artist matches (SongLink is already accurate, no title check needed)
 					if !artistsMatch(req.ArtistName, tidalArtist) {
 						GoLog("[Tidal] Artist mismatch from SongLink: expected '%s', got '%s'. Rejecting.\n",
 							req.ArtistName, tidalArtist)
@@ -1617,12 +1611,10 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 	}
 	GoLog("[Tidal] Match found: '%s' by '%s' (duration: %ds)\n", track.Title, tidalArtist, track.Duration)
 
-	// Cache the track ID for future use
 	if req.ISRC != "" {
 		GetTrackIDCache().SetTidal(req.ISRC, track.ID)
 	}
 
-	// Build filename
 	filename := buildFilenameFromTemplate(req.FilenameFormat, map[string]interface{}{
 		"title":  req.TrackName,
 		"artist": req.ArtistName,
@@ -1634,7 +1626,6 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 	filename = sanitizeFilename(filename) + ".flac"
 	outputPath := filepath.Join(req.OutputDir, filename)
 
-	// Check if file already exists (both FLAC and M4A)
 	if fileInfo, statErr := os.Stat(outputPath); statErr == nil && fileInfo.Size() > 0 {
 		return TidalDownloadResult{FilePath: "EXISTS:" + outputPath}, nil
 	}
@@ -1650,14 +1641,12 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		os.Remove(tmpPath)
 	}
 
-	// Determine quality to use (default to LOSSLESS if not specified)
 	quality := req.Quality
 	if quality == "" {
 		quality = "LOSSLESS"
 	}
 	GoLog("[Tidal] Using quality: %s\n", quality)
 
-	// Get download URL using parallel API requests
 	downloadInfo, err := downloader.GetDownloadURL(track.ID, quality)
 	if err != nil {
 		return TidalDownloadResult{}, fmt.Errorf("failed to get download URL: %w", err)
@@ -1702,18 +1691,13 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 	// Wait for parallel operations to complete
 	<-parallelDone
 
-	// Set progress to 100% and status to finalizing (before embedding)
-	// This makes the UI show "Finalizing..." while embedding happens
 	if req.ItemID != "" {
 		SetItemProgress(req.ItemID, 1.0, 0, 0)
 		SetItemFinalizing(req.ItemID)
 	}
 
-	// Check if file was saved as M4A (DASH stream) instead of FLAC
-	// downloadFromManifest saves DASH streams as .m4a (m4aPath already defined above)
 	actualOutputPath := outputPath
 	if _, err := os.Stat(m4aPath); err == nil {
-		// File was saved as M4A, use that path
 		actualOutputPath = m4aPath
 		GoLog("[Tidal] File saved as M4A (DASH stream): %s\n", actualOutputPath)
 	} else if _, err := os.Stat(outputPath); err != nil {
@@ -1734,7 +1718,6 @@ func downloadFromTidal(req DownloadRequest) (TidalDownloadResult, error) {
 		ISRC:        track.ISRC,         // Use actual ISRC from Tidal
 	}
 
-	// Use cover data from parallel fetch
 	var coverData []byte
 	if parallelResult != nil && parallelResult.CoverData != nil {
 		coverData = parallelResult.CoverData

lib/app.dart

@@ -9,7 +9,6 @@ import 'package:spotiflac_android/theme/dynamic_color_wrapper.dart';
 import 'package:spotiflac_android/l10n/app_localizations.dart';
 
 final _routerProvider = Provider<GoRouter>((ref) {
-  // Only watch isFirstLaunch to prevent router rebuild on other settings changes
   final isFirstLaunch = ref.watch(settingsProvider.select((s) => s.isFirstLaunch));
   
   return GoRouter(
@@ -35,7 +34,6 @@ class SpotiFLACApp extends ConsumerWidget {
     final router = ref.watch(_routerProvider);
     final localeString = ref.watch(settingsProvider.select((s) => s.locale));
     
-    // Convert locale string to Locale object
     Locale? locale;
     if (localeString != 'system') {
       locale = Locale(localeString);

lib/main.dart

@@ -48,7 +48,6 @@ class _EagerInitializationState extends ConsumerState<_EagerInitialization> {
       final extensionsDir = '${appDir.path}/extensions';
       final dataDir = '${appDir.path}/extension_data';
       
-      // Create directories if needed
       await Directory(extensionsDir).create(recursive: true);
       await Directory(dataDir).create(recursive: true);
       

lib/providers/download_queue_provider.dart

@@ -415,11 +415,9 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
           state = state.copyWith(items: pendingItems);
           _log.i('Restored ${pendingItems.length} pending items from storage');
 
-          // Auto-resume queue processing
           Future.microtask(() => _processQueue());
         } else {
           _log.d('No pending items to restore');
-          // Clear storage since nothing to restore
           await prefs.remove(_queueStorageKey);
         }
       } else {
@@ -603,7 +601,6 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
     if (state.outputDir.isEmpty) {
       try {
         if (Platform.isIOS) {
-          // iOS: Use Documents directory (accessible via Files app)
           final dir = await getApplicationDocumentsDirectory();
           final musicDir = Directory('${dir.path}/SpotiFLAC');
           if (!await musicDir.exists()) {
@@ -1347,7 +1344,6 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
       return;
     }
 
-    // Set currentDownload for UI reference
     state = state.copyWith(currentDownload: item);
 
     updateItemStatus(item.id, DownloadStatus.downloading);
@@ -1408,7 +1404,6 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
                 releaseDate: data['release_date'] as String?,
                 deezerId: rawId,
                 availability: trackToDownload.availability,
-                // Preserve albumType from API response or original track
                 albumType: (data['album_type'] as String?) ?? trackToDownload.albumType,
                 source: trackToDownload.source,
               );
@@ -1439,7 +1434,6 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
         albumFolderStructure: settings.albumFolderStructure,
       );
 
-      // Use quality override if set, otherwise use default from settings
       final quality = item.qualityOverride ?? state.audioQuality;
 
       Map<String, dynamic> result;
@@ -1449,7 +1443,6 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
       final useExtensions = settings.useExtensionProviders && hasActiveExtensions;
 
       if (useExtensions) {
-        // Use extension providers (includes fallback to built-in services)
         _log.d('Using extension providers for download');
         _log.d(
           'Quality: $quality${item.qualityOverride != null ? ' (override)' : ''}',
@@ -1528,7 +1521,6 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
       );
       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 {
@@ -1614,7 +1606,6 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
                         'Backend metadata - Track: $backendTrackNum, Disc: $backendDiscNum, Year: $backendYear',
                       );
 
-                      // Create updated track object with safety check for 0/null
                       final newTrackNumber =
                           (backendTrackNum != null && backendTrackNum > 0)
                           ? backendTrackNum
@@ -1647,7 +1638,6 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
                       );
                     }
 
-                    // Use enriched/updated track for metadata embedding
                     await _embedMetadataAndCover(flacPath, finalTrack);
                     _log.d('Metadata and cover embedded successfully');
                   } catch (e) {
@@ -1714,7 +1704,6 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
           final backendSampleRate = result['actual_sample_rate'] as int?;
           final backendISRC = result['isrc'] as String?;
 
-          // Log cover URL for debugging
           _log.d('Saving to history - coverUrl: ${trackToDownload.coverUrl}');
 
           final historyAlbumArtist =
@@ -1782,7 +1771,6 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
           return;
         }
 
-        // Convert error type string to enum
         DownloadErrorType errorType;
         switch (errorTypeStr) {
           case 'not_found':

lib/providers/extension_provider.dart

@@ -175,12 +175,10 @@ class SearchBehavior {
   /// Get thumbnail size based on configuration
   /// Returns (width, height) tuple
   (double, double) getThumbnailSize({double defaultSize = 56}) {
-    // If custom dimensions specified, use them
     if (thumbnailWidth != null && thumbnailHeight != null) {
       return (thumbnailWidth!.toDouble(), thumbnailHeight!.toDouble());
     }
     
-    // Otherwise use ratio presets
     switch (thumbnailRatio) {
       case 'wide': // 16:9 - YouTube style
         return (defaultSize * 16 / 9, defaultSize);
@@ -558,10 +556,8 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
       await PlatformBridge.setExtensionEnabled(extensionId, enabled);
       _log.d('Set extension $extensionId enabled: $enabled');
       
-      // Get extension info before updating state
       final ext = state.extensions.where((e) => e.id == extensionId).firstOrNull;
       
-      // Update local state
       final extensions = state.extensions.map((e) {
         if (e.id == extensionId) {
           return e.copyWith(enabled: enabled);
@@ -571,18 +567,15 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
       
       state = state.copyWith(extensions: extensions);
       
-      // If disabling an extension, reset related settings
       if (!enabled && ext != null) {
         final settings = ref.read(settingsProvider);
         
-        // If this extension was the search provider, clear it and reset to Deezer
         if (settings.searchProvider == extensionId) {
           ref.read(settingsProvider.notifier).setSearchProvider(null);
           ref.read(settingsProvider.notifier).setMetadataSource('deezer');
           _log.d('Cleared search provider and reset to Deezer because extension $extensionId was disabled');
         }
         
-        // If this extension was the default download service, reset to Tidal
         if (ext.hasDownloadProvider && settings.defaultService == extensionId) {
           ref.read(settingsProvider.notifier).setDefaultService('tidal');
           _log.d('Reset default service to Tidal because extension $extensionId was disabled');

lib/screens/album_screen.dart

@@ -89,14 +89,12 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
     try {
       Map<String, dynamic> metadata;
       
-      // Check if this is a Deezer album ID (format: "deezer:123456")
       if (widget.albumId.startsWith('deezer:')) {
         final deezerAlbumId = widget.albumId.replaceFirst('deezer:', '');
         // ignore: avoid_print
         print('[AlbumScreen] Fetching from Deezer: $deezerAlbumId');
         metadata = await PlatformBridge.getDeezerMetadata('album', deezerAlbumId);
       } else {
-        // Spotify album - use fallback method
         // ignore: avoid_print
         print('[AlbumScreen] Fetching from Spotify with fallback: ${widget.albumId}');
         final url = 'https://open.spotify.com/album/${widget.albumId}';
@@ -448,7 +446,6 @@ class _AlbumTrackItem extends ConsumerWidget {
       return state.items.where((item) => item.track.id == track.id).firstOrNull;
     }));
     
-    // Check if track is in history (already downloaded before)
     final isInHistory = ref.watch(downloadHistoryProvider.select((state) {
       return state.isDownloaded(track.id);
     }));

lib/screens/artist_screen.dart

@@ -112,7 +112,6 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
       );
     });
     
-    // If this is an extension artist, use provided data only - don't fetch from Spotify/Deezer
     if (widget.extensionId != null) {
       _albums = widget.albums;
       _topTracks = widget.topTracks;
@@ -122,8 +121,6 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
       return;
     }
     
-    // Priority: widget data > cache > fetch
-    // But always fetch if topTracks is missing (to get popular tracks)
     final cached = _ArtistCache.get(widget.artistId);
     
     if (widget.albums != null) {
@@ -132,7 +129,6 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
       _headerImageUrl = widget.headerImageUrl;
       _monthlyListeners = widget.monthlyListeners;
       
-      // If we have albums but no top tracks, fetch to get them
       if (_topTracks == null || _topTracks!.isEmpty) {
         _fetchDiscography();
       }
@@ -159,14 +155,12 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
       String? headerImage;
       int? listeners;
       
-      // Check if this is a Deezer artist ID (format: "deezer:123456")
       if (widget.artistId.startsWith('deezer:')) {
         final deezerArtistId = widget.artistId.replaceFirst('deezer:', '');
         final metadata = await PlatformBridge.getDeezerMetadata('artist', deezerArtistId);
         final albumsList = metadata['albums'] as List<dynamic>;
         albums = albumsList.map((a) => _parseArtistAlbum(a as Map<String, dynamic>)).toList();
       } else {
-        // Spotify artist - use extension handler via URL
         final url = 'https://open.spotify.com/artist/${widget.artistId}';
         final result = await PlatformBridge.handleURLWithExtension(url);
         
@@ -302,8 +296,6 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
 
   /// Build Spotify-style header with full-width image and artist name overlay
   Widget _buildHeader(BuildContext context, ColorScheme colorScheme) {
-    // Use header image if available, otherwise fall back to cover URL
-    // Prefer: fetched header > widget header > widget cover
     String? imageUrl = _headerImageUrl;
     if (imageUrl == null || imageUrl.isEmpty) {
       imageUrl = widget.headerImageUrl;
@@ -467,7 +459,6 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
       return state.items.where((item) => item.track.id == track.id).firstOrNull;
     }));
     
-    // Check if track is in history (already downloaded before)
     final isInHistory = ref.watch(downloadHistoryProvider.select((state) {
       return state.isDownloaded(track.id);
     }));

lib/screens/downloaded_album_screen.dart

@@ -159,7 +159,6 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
     final colorScheme = Theme.of(context).colorScheme;
     final bottomPadding = MediaQuery.of(context).padding.bottom;
     
-    // Watch history and get tracks for this album (reactive!)
     final allHistoryItems = ref.watch(downloadHistoryProvider.select((s) => s.items));
     final tracks = _getAlbumTracks(allHistoryItems);
     

lib/screens/home_screen.dart

@@ -329,7 +329,6 @@ class _HomeScreenState extends ConsumerState<HomeScreen> {
   }
   
   Future<void> _openCollection(Track track) async {
-    // Get the extension ID from the track source
     final extensionId = track.source;
     if (extensionId == null) return;
     

lib/screens/home_tab.dart

@@ -76,10 +76,8 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
   }  void _onSearchChanged() {
     final text = _urlController.text.trim();
     
-    // Update search text state for MainShell back button handling
     ref.read(trackProvider.notifier).setSearchText(text.isNotEmpty);
     
-    // Update typing state immediately for UI transition
     if (text.isNotEmpty && !_isTyping) {
       setState(() => _isTyping = true);
     } else if (text.isEmpty && _isTyping) {
@@ -103,17 +101,13 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     if (_lastSearchQuery == searchKey) return;
     _lastSearchQuery = searchKey;
     
-    // Check if extension search provider is set AND still enabled
     final isExtensionEnabled = searchProvider != null && 
         searchProvider.isNotEmpty &&
         extState.extensions.any((e) => e.id == searchProvider && e.enabled);
     
     if (isExtensionEnabled) {
-      // Use custom search from extension
       await ref.read(trackProvider.notifier).customSearch(searchProvider, query);
     } else {
-      // Use default search (Deezer/Spotify)
-      // Also clear searchProvider if it was set but extension is disabled
       if (searchProvider != null && searchProvider.isNotEmpty && !isExtensionEnabled) {
         ref.read(settingsProvider.notifier).setSearchProvider(null);
       }
@@ -238,7 +232,6 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     int currentProgress = 0;
     int totalTracks = 0;
     
-    // Use StatefulBuilder to update dialog content
     bool dialogShown = false;
     StateSetter? setDialogState;
     
@@ -322,8 +315,6 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
               action: SnackBarAction(
                 label: l10n.snackbarViewQueue,
                 onPressed: () {
-                   // Navigate to queue tab (handled by main_shell index)
-                   // We don't have direct access to set index here easily without provider
                 },
               ),
             ),
@@ -348,14 +339,12 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
       }
     });
     
-    // Use select() to only rebuild when specific fields change
     final tracks = ref.watch(trackProvider.select((s) => s.tracks));
     final searchArtists = ref.watch(trackProvider.select((s) => s.searchArtists));
     final isLoading = ref.watch(trackProvider.select((s) => s.isLoading));
     final error = ref.watch(trackProvider.select((s) => s.error));
     final hasSearchedBefore = ref.watch(settingsProvider.select((s) => s.hasSearchedBefore));
     
-    // Watch extension state to update search hint when extensions load/change
     ref.watch(extensionProvider.select((s) => s.isInitialized));
     ref.watch(extensionProvider.select((s) => s.extensions));
     
@@ -612,7 +601,6 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     // Merge with recent downloads to make the list more populated
     final historyItems = ref.read(downloadHistoryProvider).items;
     
-    // Convert download history to RecentAccessItem format
     final downloadItems = historyItems.take(10).where((h) => h.spotifyId != null && h.spotifyId!.isNotEmpty).map((h) => RecentAccessItem(
       id: h.spotifyId!,
       name: h.trackName,
@@ -748,7 +736,6 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
                   ],
                 ),
               ),
-              // Delete button (like Spotify's X)
               IconButton(
                 icon: Icon(Icons.close, size: 20, color: colorScheme.onSurfaceVariant),
                 onPressed: () {
@@ -767,7 +754,6 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     
     switch (item.type) {
       case RecentAccessType.artist:
-        // Check if artist is from extension (not spotify/deezer)
         if (item.providerId != null && item.providerId!.isNotEmpty && item.providerId != 'deezer' && item.providerId != 'spotify') {
           Navigator.push(context, MaterialPageRoute(
             builder: (context) => ExtensionArtistScreen(
@@ -1389,16 +1375,13 @@ class _TrackItemWithStatus extends ConsumerWidget {
       return state.items.where((item) => item.track.id == track.id).firstOrNull;
     }));
     
-    // Check if track is in history (already downloaded before)
     final isInHistory = ref.watch(downloadHistoryProvider.select((state) {
       return state.isDownloaded(track.id);
     }));
     
-    // Get thumbnail size from extension if track is from extension
     double thumbWidth = 56;
     double thumbHeight = 56;
     
-    // Get extension ID from track.source or from TrackState.searchExtensionId
     final trackState = ref.watch(trackProvider);
     final extensionId = track.source ?? trackState.searchExtensionId;
     
@@ -1499,7 +1482,6 @@ class _TrackItemWithStatus extends ConsumerWidget {
     // If already in queue, do nothing
     if (isQueued) return;
     
-    // If in history, check if file still exists
     if (isInHistory) {
       final historyItem = ref.read(downloadHistoryProvider.notifier).getBySpotifyId(track.id);
       if (historyItem != null) {

lib/screens/main_shell.dart

@@ -36,7 +36,6 @@ class _MainShellState extends ConsumerState<MainShell> {
   void initState() {
     super.initState();
     _pageController = PageController(initialPage: _currentIndex);
-    // Check for updates after first frame
     WidgetsBinding.instance.addPostFrameCallback((_) {
       _checkForUpdates();
       _setupShareListener();
@@ -44,7 +43,6 @@ class _MainShellState extends ConsumerState<MainShell> {
   }
 
   void _setupShareListener() {
-    // Check for pending URL that was received before listener was ready
     final pendingUrl = ShareIntentService().consumePendingUrl();
     if (pendingUrl != null) {
       _log.d('Processing pending shared URL: $pendingUrl');
@@ -124,8 +122,6 @@ class _MainShellState extends ConsumerState<MainShell> {
   void _onPageChanged(int index) {
     if (_currentIndex != index) {
       setState(() => _currentIndex = index);
-      // Unfocus any text field when switching tabs to prevent keyboard from appearing
-      // Use primaryFocus for more aggressive unfocus that works with keep-alive widgets
       FocusManager.instance.primaryFocus?.unfocus();
     }
   }
@@ -134,7 +130,6 @@ 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) {
       FocusManager.instance.primaryFocus?.unfocus();
@@ -144,7 +139,6 @@ class _MainShellState extends ConsumerState<MainShell> {
     // If on Home tab and showing recent access mode, exit it
     if (_currentIndex == 0 && trackState.isShowingRecentAccess) {
       ref.read(trackProvider.notifier).setShowingRecentAccess(false);
-      // Also unfocus search bar when exiting recent access mode
       FocusManager.instance.primaryFocus?.unfocus();
       return;
     }
@@ -189,7 +183,6 @@ class _MainShellState extends ConsumerState<MainShell> {
     final showStore = ref.watch(settingsProvider.select((s) => s.showExtensionStore));
     final storeUpdatesCount = ref.watch(storeProvider.select((s) => s.updatesAvailableCount));
     
-    // 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)
@@ -202,7 +195,6 @@ class _MainShellState extends ConsumerState<MainShell> {
                    !trackState.isShowingRecentAccess &&
                    !isKeyboardVisible;
 
-    // Build tabs and destinations based on settings
     final tabs = <Widget>[
       const HomeTab(),
       QueueTab(

lib/screens/playlist_screen.dart

@@ -222,7 +222,6 @@ class _PlaylistTrackItem extends ConsumerWidget {
       return state.items.where((item) => item.track.id == track.id).firstOrNull;
     }));
     
-    // Check if track is in history (already downloaded before)
     final isInHistory = ref.watch(downloadHistoryProvider.select((state) {
       return state.isDownloaded(track.id);
     }));

lib/screens/settings/download_settings_page.dart

@@ -473,7 +473,6 @@ class DownloadSettingsPage extends ConsumerWidget {
       // iOS: Show options dialog
       _showIOSDirectoryOptions(context, ref);
     } else {
-      // Android: Use file picker
       final result = await FilePicker.platform.getDirectoryPath();
       if (result != null) {
         ref.read(settingsProvider.notifier).setDownloadDirectory(result);

lib/screens/settings/extensions_page.dart

@@ -500,7 +500,6 @@ class _MetadataPriorityItem extends ConsumerWidget {
     final extState = ref.watch(extensionProvider);
     final colorScheme = Theme.of(context).colorScheme;
     
-    // Check if any extension has metadata provider
     final hasMetadataExtensions = extState.extensions
         .any((e) => e.enabled && e.hasMetadataProvider);
     

lib/screens/settings/options_settings_page.dart

@@ -838,7 +838,6 @@ class _MetadataSourceSelector extends ConsumerWidget {
                 // Not selected if extension is active
                 isSelected: currentSource == 'deezer' && !hasExtensionSearch,
                 onTap: () {
-                  // If extension was active, reset it to default
                   if (hasExtensionSearch) {
                     ref.read(settingsProvider.notifier).setSearchProvider(null);
                   }

lib/screens/settings/settings_tab.dart

@@ -123,16 +123,12 @@ class SettingsTab extends ConsumerWidget {
   }
 
   void _navigateTo(BuildContext context, Widget page) {
-    // Unfocus any focused widget before navigating to prevent keyboard from appearing on return
     FocusManager.instance.primaryFocus?.unfocus();
     
     Navigator.of(context).push(
-      // Use PageRouteBuilder for better predictive back gesture support
-      // MaterialPageRoute can cause freeze on some devices with gesture navigation
       PageRouteBuilder(
         pageBuilder: (context, animation, secondaryAnimation) => page,
         transitionsBuilder: (context, animation, secondaryAnimation, child) {
-          // Use slide transition similar to MaterialPageRoute
           const begin = Offset(1.0, 0.0);
           const end = Offset.zero;
           const curve = Curves.easeInOut;

lib/theme/dynamic_color_wrapper.dart

@@ -45,7 +45,6 @@ class DynamicColorWrapper extends ConsumerWidget {
           darkScheme = _applyAmoledColors(darkScheme);
         }
 
-        // Build themes
         final lightTheme = AppTheme.light(dynamicScheme: lightScheme);
         final darkTheme = AppTheme.dark(dynamicScheme: darkScheme, isAmoled: themeSettings.useAmoled);
 

lib/utils/logger.dart

@@ -55,7 +55,6 @@ class LogBuffer extends ChangeNotifier {
   static bool get loggingEnabled => _loggingEnabled;
   static set loggingEnabled(bool value) {
     _loggingEnabled = value;
-    // Also notify Go backend about logging state
     if (value) {
       PlatformBridge.setGoLoggingEnabled(true).catchError((_) {});
     } else {
@@ -121,7 +120,6 @@ class LogBuffer extends ChangeNotifier {
               );
             }
           } catch (_) {
-            // Use current time if parsing fails
           }
         }
         
@@ -146,7 +144,6 @@ class LogBuffer extends ChangeNotifier {
   void clear() {
     _entries.clear();
     _lastGoLogIndex = 0;
-    // Also clear Go backend logs
     PlatformBridge.clearGoLogs().catchError((_) {});
     notifyListeners();
   }
@@ -249,8 +246,6 @@ class AppLogger {
   late final Logger? _logger;
 
   AppLogger(this._tag) {
-    // Only create Logger instance in debug mode
-    // In release mode, we write directly to LogBuffer
     if (kDebugMode) {
       _logger = Logger(
         printer: SimplePrinter(printTime: false, colors: false),
@@ -276,7 +271,6 @@ class AppLogger {
     if (kDebugMode) {
       _logger?.d(message);
     } else {
-      // In release mode, write directly to buffer
       _addToBuffer('DEBUG', message);
     }
   }