fix: prefer local file for cover/lyrics save and update build dependencies

- Cover art: extract from downloaded file first, fall back to URL download
- Lyrics: check embedded lyrics/sidecar LRC before fetching online
- Add audioFilePath param to FetchAndSaveLyrics (Go, Kotlin, Swift, Dart)
- Handle SAF content:// URIs for lyrics extraction in Kotlin bridge
- Update Go 1.25.7 -> 1.25.8, Gradle 9.3.1 -> 9.4.1, Kotlin 2.2.21 -> 2.3.20
- Update NDK r27d -> r28b, Flutter FVM 3.41.4 -> 3.41.5
- Upgrade all Flutter and Go module dependencies to latest

lib/screens/track_metadata_screen.dart

@@ -1956,17 +1956,29 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
             '${tempDir.path}${Platform.pathSeparator}$baseName.jpg';
 
         Map<String, dynamic> result;
-        if (_coverUrl != null && _coverUrl!.isNotEmpty) {
+        if (_fileExists) {
+          // Prefer extracting cover from the already-downloaded file to avoid
+          // a redundant network request.
+          result = await PlatformBridge.extractCoverToFile(
+            cleanFilePath,
+            tempOutput,
+          );
+          // Fall back to downloading from URL if extraction failed.
+          if (result['error'] != null &&
+              _coverUrl != null &&
+              _coverUrl!.isNotEmpty) {
+            result = await PlatformBridge.downloadCoverToFile(
+              _coverUrl!,
+              tempOutput,
+              maxQuality: true,
+            );
+          }
+        } else if (_coverUrl != null && _coverUrl!.isNotEmpty) {
           result = await PlatformBridge.downloadCoverToFile(
             _coverUrl!,
             tempOutput,
             maxQuality: true,
           );
-        } else if (_fileExists) {
-          result = await PlatformBridge.extractCoverToFile(
-            cleanFilePath,
-            tempOutput,
-          );
         } else {
           if (mounted) {
             ScaffoldMessenger.of(context).showSnackBar(
@@ -2042,17 +2054,29 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
       final outputPath = '$dir${Platform.pathSeparator}$baseName.jpg';
 
       Map<String, dynamic> result;
-      if (_coverUrl != null && _coverUrl!.isNotEmpty) {
+      if (_fileExists) {
+        // Prefer extracting cover from the already-downloaded file to avoid
+        // a redundant network request.
+        result = await PlatformBridge.extractCoverToFile(
+          cleanFilePath,
+          outputPath,
+        );
+        // Fall back to downloading from URL if extraction failed.
+        if (result['error'] != null &&
+            _coverUrl != null &&
+            _coverUrl!.isNotEmpty) {
+          result = await PlatformBridge.downloadCoverToFile(
+            _coverUrl!,
+            outputPath,
+            maxQuality: true,
+          );
+        }
+      } else if (_coverUrl != null && _coverUrl!.isNotEmpty) {
         result = await PlatformBridge.downloadCoverToFile(
           _coverUrl!,
           outputPath,
           maxQuality: true,
         );
-      } else if (_fileExists) {
-        result = await PlatformBridge.extractCoverToFile(
-          cleanFilePath,
-          outputPath,
-        );
       } else {
         if (mounted) {
           ScaffoldMessenger.of(context).showSnackBar(
@@ -2110,6 +2134,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
           spotifyId: _spotifyId ?? '',
           durationMs: durationMs,
           outputPath: tempOutput,
+          audioFilePath: _fileExists ? cleanFilePath : '',
         );
 
         if (result['error'] != null) {
@@ -2194,6 +2219,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
         spotifyId: _spotifyId ?? '',
         durationMs: durationMs,
         outputPath: outputPath,
+        audioFilePath: _fileExists ? cleanFilePath : '',
       );
 
       if (mounted) {

lib/services/platform_bridge.dart

@@ -341,6 +341,7 @@ class PlatformBridge {
     required String spotifyId,
     required int durationMs,
     required String outputPath,
+    String audioFilePath = '',
   }) async {
     final result = await _channel.invokeMethod('fetchAndSaveLyrics', {
       'track_name': trackName,
@@ -348,6 +349,7 @@ class PlatformBridge {
       'spotify_id': spotifyId,
       'duration_ms': durationMs,
       'output_path': outputPath,
+      'audio_file_path': audioFilePath,
     });
     return jsonDecode(result as String) as Map<String, dynamic>;
   }