Merge dev into main: v3.0.0 stable release

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 = '2.2.9';
-  static const String buildNumber = '51';
+  static const String version = '3.0.0';
+  static const String buildNumber = '57';
   static const String fullVersion = '$version+$buildNumber';
   
   

lib/main.dart

@@ -1,7 +1,10 @@
+import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:path_provider/path_provider.dart';
 import 'package:spotiflac_android/app.dart';
 import 'package:spotiflac_android/providers/download_queue_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
 import 'package:spotiflac_android/services/notification_service.dart';
 import 'package:spotiflac_android/services/share_intent_service.dart';
 
@@ -24,14 +27,42 @@ void main() async {
 }
 
 /// Widget to eagerly initialize providers that need to load data on startup
-class _EagerInitialization extends ConsumerWidget {
+class _EagerInitialization extends ConsumerStatefulWidget {
   const _EagerInitialization({required this.child});
   final Widget child;
 
   @override
-  Widget build(BuildContext context, WidgetRef ref) {
+  ConsumerState<_EagerInitialization> createState() => _EagerInitializationState();
+}
+
+class _EagerInitializationState extends ConsumerState<_EagerInitialization> {
+  @override
+  void initState() {
+    super.initState();
+    _initializeExtensions();
+  }
+
+  Future<void> _initializeExtensions() async {
+    try {
+      final appDir = await getApplicationDocumentsDirectory();
+      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);
+      
+      // Initialize extension system
+      await ref.read(extensionProvider.notifier).initialize(extensionsDir, dataDir);
+    } catch (e) {
+      debugPrint('Failed to initialize extensions: $e');
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
     // Eagerly initialize download history provider to load from storage
     ref.watch(downloadHistoryProvider);
-    return child;
+    return widget.child;
   }
 }

lib/models/settings.dart

@@ -25,6 +25,11 @@ class AppSettings {
   final bool useCustomSpotifyCredentials; // Whether to use custom credentials (if set)
   final String metadataSource; // spotify, deezer - source for search and metadata
   final bool enableLogging; // Enable detailed logging for debugging
+  final bool useExtensionProviders; // Use extension providers for downloads when available
+  final String? searchProvider; // null/empty = default (Deezer/Spotify), otherwise extension ID
+  final bool separateSingles; // Separate singles/EPs into their own folder
+  final String albumFolderStructure; // artist_album or album_only
+  final bool showExtensionStore; // Show Extension Store tab in navigation
 
   const AppSettings({
     this.defaultService = 'tidal',
@@ -48,6 +53,11 @@ class AppSettings {
     this.useCustomSpotifyCredentials = true, // Default: use custom if set
     this.metadataSource = 'deezer', // Default: Deezer (no rate limit)
     this.enableLogging = false, // Default: disabled for performance
+    this.useExtensionProviders = true, // Default: use extensions when available
+    this.searchProvider, // Default: null (use Deezer/Spotify)
+    this.separateSingles = false, // Default: disabled
+    this.albumFolderStructure = 'artist_album', // Default: Albums/Artist/Album
+    this.showExtensionStore = true, // Default: show store
   });
 
   AppSettings copyWith({
@@ -72,6 +82,12 @@ class AppSettings {
     bool? useCustomSpotifyCredentials,
     String? metadataSource,
     bool? enableLogging,
+    bool? useExtensionProviders,
+    String? searchProvider,
+    bool clearSearchProvider = false, // Set to true to clear searchProvider to null
+    bool? separateSingles,
+    String? albumFolderStructure,
+    bool? showExtensionStore,
   }) {
     return AppSettings(
       defaultService: defaultService ?? this.defaultService,
@@ -95,6 +111,11 @@ class AppSettings {
       useCustomSpotifyCredentials: useCustomSpotifyCredentials ?? this.useCustomSpotifyCredentials,
       metadataSource: metadataSource ?? this.metadataSource,
       enableLogging: enableLogging ?? this.enableLogging,
+      useExtensionProviders: useExtensionProviders ?? this.useExtensionProviders,
+      searchProvider: clearSearchProvider ? null : (searchProvider ?? this.searchProvider),
+      separateSingles: separateSingles ?? this.separateSingles,
+      albumFolderStructure: albumFolderStructure ?? this.albumFolderStructure,
+      showExtensionStore: showExtensionStore ?? this.showExtensionStore,
     );
   }
 

lib/models/settings.g.dart

@@ -29,6 +29,11 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
       json['useCustomSpotifyCredentials'] as bool? ?? true,
   metadataSource: json['metadataSource'] as String? ?? 'deezer',
   enableLogging: json['enableLogging'] as bool? ?? false,
+  useExtensionProviders: json['useExtensionProviders'] as bool? ?? true,
+  searchProvider: json['searchProvider'] as String?,
+  separateSingles: json['separateSingles'] as bool? ?? false,
+  albumFolderStructure: json['albumFolderStructure'] as String? ?? 'artist_album',
+  showExtensionStore: json['showExtensionStore'] as bool? ?? true,
 );
 
 Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
@@ -54,4 +59,9 @@ Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>
       'useCustomSpotifyCredentials': instance.useCustomSpotifyCredentials,
       'metadataSource': instance.metadataSource,
       'enableLogging': instance.enableLogging,
+      'useExtensionProviders': instance.useExtensionProviders,
+      'searchProvider': instance.searchProvider,
+      'separateSingles': instance.separateSingles,
+      'albumFolderStructure': instance.albumFolderStructure,
+      'showExtensionStore': instance.showExtensionStore,
     };

lib/models/track.dart

@@ -18,6 +18,8 @@ class Track {
   final String? releaseDate;
   final String? deezerId;
   final ServiceAvailability? availability;
+  final String? source; // Extension ID that provided this track (null for built-in sources)
+  final String? albumType; // album, single, ep, compilation (from metadata API)
 
   const Track({
     required this.id,
@@ -33,10 +35,18 @@ class Track {
     this.releaseDate,
     this.deezerId,
     this.availability,
+    this.source,
+    this.albumType,
   });
 
+  /// Check if this track is a single (based on album_type metadata)
+  bool get isSingle => albumType == 'single' || albumType == 'ep';
+
   factory Track.fromJson(Map<String, dynamic> json) => _$TrackFromJson(json);
   Map<String, dynamic> toJson() => _$TrackToJson(this);
+  
+  /// Check if this track is from an extension
+  bool get isFromExtension => source != null && source!.isNotEmpty;
 }
 
 @JsonSerializable()

lib/models/track.g.dart

@@ -24,6 +24,8 @@ Track _$TrackFromJson(Map<String, dynamic> json) => Track(
       : ServiceAvailability.fromJson(
           json['availability'] as Map<String, dynamic>,
         ),
+  source: json['source'] as String?,
+  albumType: json['albumType'] as String?,
 );
 
 Map<String, dynamic> _$TrackToJson(Track instance) => <String, dynamic>{
@@ -40,6 +42,8 @@ Map<String, dynamic> _$TrackToJson(Track instance) => <String, dynamic>{
   'releaseDate': instance.releaseDate,
   'deezerId': instance.deezerId,
   'availability': instance.availability,
+  'source': instance.source,
+  'albumType': instance.albumType,
 };
 
 ServiceAvailability _$ServiceAvailabilityFromJson(Map<String, dynamic> json) =>

lib/providers/download_queue_provider.dart

@@ -9,6 +9,7 @@ import 'package:spotiflac_android/models/download_item.dart';
 import 'package:spotiflac_android/models/settings.dart';
 import 'package:spotiflac_android/models/track.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
 import 'package:spotiflac_android/services/ffmpeg_service.dart';
 import 'package:spotiflac_android/services/notification_service.dart';
@@ -667,35 +668,64 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
     state = state.copyWith(outputDir: dir);
   }
 
-  /// Build output directory based on folder organization setting
-  Future<String> _buildOutputDir(Track track, String folderOrganization) async {
+  /// Build output directory based on folder organization setting and separateSingles
+  Future<String> _buildOutputDir(Track track, String folderOrganization, {bool separateSingles = false, String albumFolderStructure = 'artist_album'}) async {
     String baseDir = state.outputDir;
 
-    if (folderOrganization == 'none') {
-      return baseDir;
+    // If separateSingles is enabled, use Albums/Singles structure
+    if (separateSingles) {
+      final isSingle = track.isSingle;
+      
+      if (isSingle) {
+        // Singles go to Singles folder (flat structure)
+        final singlesPath = '$baseDir${Platform.pathSeparator}Singles';
+        final dir = Directory(singlesPath);
+        if (!await dir.exists()) {
+          await dir.create(recursive: true);
+          _log.d('Created Singles folder: $singlesPath');
+        }
+        return singlesPath;
+      } else {
+        // Albums folder structure based on setting
+        final albumName = _sanitizeFolderName(track.albumName);
+        String albumPath;
+        
+        if (albumFolderStructure == 'album_only') {
+          // Albums/Album structure (no artist folder)
+          albumPath = '$baseDir${Platform.pathSeparator}Albums${Platform.pathSeparator}$albumName';
+        } else {
+          // Albums/Artist/Album structure (default)
+          final artistName = _sanitizeFolderName(track.albumArtist ?? track.artistName);
+          albumPath = '$baseDir${Platform.pathSeparator}Albums${Platform.pathSeparator}$artistName${Platform.pathSeparator}$albumName';
+        }
+        
+        final dir = Directory(albumPath);
+        if (!await dir.exists()) {
+          await dir.create(recursive: true);
+          _log.d('Created Album folder: $albumPath');
+        }
+        return albumPath;
+      }
     }
 
-    // Sanitize folder names (remove invalid characters)
-    String sanitize(String name) {
-      return name
-          .replaceAll(RegExp(r'[<>:"/\\|?*]'), '_')
-          .replaceAll(RegExp(r'\.+$'), '') // Remove trailing dots
-          .trim();
+    // Original folder organization logic (when separateSingles is disabled)
+    if (folderOrganization == 'none') {
+      return baseDir;
     }
 
     String subPath = '';
     switch (folderOrganization) {
       case 'artist':
-        final artistName = sanitize(track.albumArtist ?? track.artistName);
+        final artistName = _sanitizeFolderName(track.albumArtist ?? track.artistName);
         subPath = artistName;
         break;
       case 'album':
-        final albumName = sanitize(track.albumName);
+        final albumName = _sanitizeFolderName(track.albumName);
         subPath = albumName;
         break;
       case 'artist_album':
-        final artistName = sanitize(track.albumArtist ?? track.artistName);
-        final albumName = sanitize(track.albumName);
+        final artistName = _sanitizeFolderName(track.albumArtist ?? track.artistName);
+        final albumName = _sanitizeFolderName(track.albumName);
         subPath = '$artistName${Platform.pathSeparator}$albumName';
         break;
     }
@@ -713,6 +743,14 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
     return baseDir;
   }
 
+  /// Sanitize folder names (remove invalid characters)
+  String _sanitizeFolderName(String name) {
+    return name
+        .replaceAll(RegExp(r'[<>:"/\\|?*]'), '_')
+        .replaceAll(RegExp(r'\.+$'), '') // Remove trailing dots
+        .trim();
+  }
+
   void updateSettings(AppSettings settings) {
     state = state.copyWith(
       outputDir: settings.downloadDirectory.isNotEmpty
@@ -922,13 +960,92 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
     _saveQueueToStorage(); // Persist queue
   }
 
+  /// Run post-processing hooks on a downloaded file
+  Future<void> _runPostProcessingHooks(String filePath, Track track) async {
+    try {
+      final settings = ref.read(settingsProvider);
+      final extensionState = ref.read(extensionProvider);
+      
+      // Check if post-processing is enabled and there are extensions with hooks
+      if (!settings.useExtensionProviders) return;
+      
+      final hasPostProcessing = extensionState.extensions.any(
+        (e) => e.enabled && e.hasPostProcessing,
+      );
+      if (!hasPostProcessing) return;
+      
+      _log.d('Running post-processing hooks on: $filePath');
+      
+      // Build metadata map for post-processing
+      final metadata = <String, dynamic>{
+        'title': track.name,
+        'artist': track.artistName,
+        'album': track.albumName,
+        'album_artist': track.albumArtist ?? track.artistName,
+        'track_number': track.trackNumber ?? 1,
+        'disc_number': track.discNumber ?? 1,
+        'isrc': track.isrc ?? '',
+        'release_date': track.releaseDate ?? '',
+        'duration_ms': track.duration * 1000,
+        'cover_url': track.coverUrl ?? '',
+      };
+      
+      final result = await PlatformBridge.runPostProcessing(filePath, metadata: metadata);
+      
+      if (result['success'] == true) {
+        final hooksRun = result['hooks_run'] as int? ?? 0;
+        final newPath = result['file_path'] as String?;
+        _log.i('Post-processing completed: $hooksRun hook(s) executed');
+        
+        if (newPath != null && newPath != filePath) {
+          _log.d('File path changed by post-processing: $newPath');
+        }
+      } else {
+        final error = result['error'] as String? ?? 'Unknown error';
+        _log.w('Post-processing failed: $error');
+      }
+    } catch (e) {
+      _log.w('Post-processing error: $e');
+      // Don't fail the download if post-processing fails
+    }
+  }
+
+  /// Upgrade Spotify cover URL to max quality (~2000x2000)
+  /// Same logic as Go backend cover.go
+  String _upgradeToMaxQualityCover(String coverUrl) {
+    const spotifySize300 = 'ab67616d00001e02'; // 300x300 (small)
+    const spotifySize640 = 'ab67616d0000b273'; // 640x640 (medium)
+    const spotifySizeMax = 'ab67616d000082c1'; // Max resolution (~2000x2000)
+    
+    // First upgrade small (300) to medium (640)
+    var result = coverUrl;
+    if (result.contains(spotifySize300)) {
+      result = result.replaceFirst(spotifySize300, spotifySize640);
+    }
+    
+    // Then upgrade medium (640) to max
+    if (result.contains(spotifySize640)) {
+      result = result.replaceFirst(spotifySize640, spotifySizeMax);
+    }
+    
+    return result;
+  }
+
   /// Embed metadata and cover to a FLAC file after M4A conversion
   Future<void> _embedMetadataAndCover(String flacPath, Track track) async {
+    final settings = ref.read(settingsProvider);
+    
     // Download cover first
     String? coverPath;
-    final coverUrl = track.coverUrl;
+    var coverUrl = track.coverUrl;
     if (coverUrl != null && coverUrl.isNotEmpty) {
       try {
+        // Upgrade cover URL to max quality if setting is enabled
+        if (settings.maxQualityCover) {
+          coverUrl = _upgradeToMaxQualityCover(coverUrl);
+          _log.d('Cover URL upgraded to max quality: $coverUrl');
+        }
+        
         final tempDir = await getTemporaryDirectory();
         final uniqueId =
             '${DateTime.now().millisecondsSinceEpoch}_${Random().nextInt(10000)}';
@@ -1366,6 +1483,8 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
       final outputDir = await _buildOutputDir(
         trackToDownload,
         settings.folderOrganization,
+        separateSingles: settings.separateSingles,
+        albumFolderStructure: settings.albumFolderStructure,
       );
 
       // Use quality override if set, otherwise use default from settings
@@ -1373,7 +1492,37 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
 
       Map<String, dynamic> result;
 
-      if (state.autoFallback) {
+      // Check if extension providers should be used
+      final extensionState = ref.read(extensionProvider);
+      final hasActiveExtensions = extensionState.extensions.any((e) => e.enabled);
+      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)' : ''}',
+        );
+        _log.d('Output dir: $outputDir');
+        result = await PlatformBridge.downloadWithExtensions(
+          isrc: trackToDownload.isrc ?? '',
+          spotifyId: trackToDownload.id,
+          trackName: trackToDownload.name,
+          artistName: trackToDownload.artistName,
+          albumName: trackToDownload.albumName,
+          albumArtist: trackToDownload.albumArtist,
+          coverUrl: trackToDownload.coverUrl,
+          outputDir: outputDir,
+          filenameFormat: state.filenameFormat,
+          quality: quality,
+          trackNumber: trackToDownload.trackNumber ?? 1,
+          discNumber: trackToDownload.discNumber ?? 1,
+          releaseDate: trackToDownload.releaseDate,
+          itemId: item.id,
+          durationMs: trackToDownload.duration,
+          source: trackToDownload.source, // Pass extension ID that provided this track
+        );
+      } else if (state.autoFallback) {
         _log.d('Using auto-fallback mode');
         _log.d(
           'Quality: $quality${item.qualityOverride != null ? ' (override)' : ''}',
@@ -1447,6 +1596,12 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
 
       if (result['success'] == true) {
         var filePath = result['file_path'] as String?;
+        
+        // Strip EXISTS: prefix from duplicate detection
+        if (filePath != null && filePath.startsWith('EXISTS:')) {
+          filePath = filePath.substring(7); // Remove "EXISTS:" prefix
+        }
+        
         _log.i('Download success, file: $filePath');
 
         // Get actual quality from response (if available)
@@ -1593,6 +1748,11 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
           filePath: filePath,
         );
 
+        // Run post-processing hooks if enabled
+        if (filePath != null) {
+          await _runPostProcessingHooks(filePath, trackToDownload);
+        }
+
         // Increment completed counter
         _completedInSession++;
 

lib/providers/extension_provider.dart

@@ -0,0 +1,715 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/services/platform_bridge.dart';
+import 'package:spotiflac_android/utils/logger.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
+
+final _log = AppLogger('ExtensionProvider');
+
+/// Represents an installed extension
+class Extension {
+  final String id;
+  final String name;
+  final String displayName;
+  final String version;
+  final String author;
+  final String description;
+  final bool enabled;
+  final String status; // 'loaded', 'error', 'disabled'
+  final String? errorMessage;
+  final String? iconPath; // Path to extension icon
+  final List<String> permissions;
+  final List<ExtensionSetting> settings;
+  final List<QualityOption> qualityOptions; // Custom quality options for download providers
+  final bool hasMetadataProvider;
+  final bool hasDownloadProvider;
+  final bool skipMetadataEnrichment; // If true, use metadata from extension instead of enriching
+  final SearchBehavior? searchBehavior; // Custom search behavior
+  final URLHandler? urlHandler; // Custom URL handling
+  final TrackMatching? trackMatching; // Custom track matching
+  final PostProcessing? postProcessing; // Post-processing hooks
+
+  const Extension({
+    required this.id,
+    required this.name,
+    required this.displayName,
+    required this.version,
+    required this.author,
+    required this.description,
+    required this.enabled,
+    required this.status,
+    this.errorMessage,
+    this.iconPath,
+    this.permissions = const [],
+    this.settings = const [],
+    this.qualityOptions = const [],
+    this.hasMetadataProvider = false,
+    this.hasDownloadProvider = false,
+    this.skipMetadataEnrichment = false,
+    this.searchBehavior,
+    this.urlHandler,
+    this.trackMatching,
+    this.postProcessing,
+  });
+
+  factory Extension.fromJson(Map<String, dynamic> json) {
+    return Extension(
+      id: json['id'] as String? ?? '',
+      name: json['name'] as String? ?? '',
+      displayName: json['display_name'] as String? ?? json['name'] as String? ?? '',
+      version: json['version'] as String? ?? '0.0.0',
+      author: json['author'] as String? ?? 'Unknown',
+      description: json['description'] as String? ?? '',
+      enabled: json['enabled'] as bool? ?? false,
+      status: json['status'] as String? ?? 'loaded',
+      errorMessage: json['error_message'] as String?,
+      iconPath: json['icon_path'] as String?,
+      permissions: (json['permissions'] as List<dynamic>?)?.cast<String>() ?? [],
+      settings: (json['settings'] as List<dynamic>?)
+          ?.map((s) => ExtensionSetting.fromJson(s as Map<String, dynamic>))
+          .toList() ?? [],
+      qualityOptions: (json['quality_options'] as List<dynamic>?)
+          ?.map((q) => QualityOption.fromJson(q as Map<String, dynamic>))
+          .toList() ?? [],
+      hasMetadataProvider: json['has_metadata_provider'] as bool? ?? false,
+      hasDownloadProvider: json['has_download_provider'] as bool? ?? false,
+      skipMetadataEnrichment: json['skip_metadata_enrichment'] as bool? ?? false,
+      searchBehavior: json['search_behavior'] != null 
+          ? SearchBehavior.fromJson(json['search_behavior'] as Map<String, dynamic>)
+          : null,
+      urlHandler: json['url_handler'] != null
+          ? URLHandler.fromJson(json['url_handler'] as Map<String, dynamic>)
+          : null,
+      trackMatching: json['track_matching'] != null
+          ? TrackMatching.fromJson(json['track_matching'] as Map<String, dynamic>)
+          : null,
+      postProcessing: json['post_processing'] != null
+          ? PostProcessing.fromJson(json['post_processing'] as Map<String, dynamic>)
+          : null,
+    );
+  }
+
+  Extension copyWith({
+    String? id,
+    String? name,
+    String? displayName,
+    String? version,
+    String? author,
+    String? description,
+    bool? enabled,
+    String? status,
+    String? errorMessage,
+    String? iconPath,
+    List<String>? permissions,
+    List<ExtensionSetting>? settings,
+    List<QualityOption>? qualityOptions,
+    bool? hasMetadataProvider,
+    bool? hasDownloadProvider,
+    bool? skipMetadataEnrichment,
+    SearchBehavior? searchBehavior,
+    URLHandler? urlHandler,
+    TrackMatching? trackMatching,
+    PostProcessing? postProcessing,
+  }) {
+    return Extension(
+      id: id ?? this.id,
+      name: name ?? this.name,
+      displayName: displayName ?? this.displayName,
+      version: version ?? this.version,
+      author: author ?? this.author,
+      description: description ?? this.description,
+      enabled: enabled ?? this.enabled,
+      status: status ?? this.status,
+      errorMessage: errorMessage ?? this.errorMessage,
+      iconPath: iconPath ?? this.iconPath,
+      permissions: permissions ?? this.permissions,
+      settings: settings ?? this.settings,
+      qualityOptions: qualityOptions ?? this.qualityOptions,
+      hasMetadataProvider: hasMetadataProvider ?? this.hasMetadataProvider,
+      hasDownloadProvider: hasDownloadProvider ?? this.hasDownloadProvider,
+      skipMetadataEnrichment: skipMetadataEnrichment ?? this.skipMetadataEnrichment,
+      searchBehavior: searchBehavior ?? this.searchBehavior,
+      urlHandler: urlHandler ?? this.urlHandler,
+      trackMatching: trackMatching ?? this.trackMatching,
+      postProcessing: postProcessing ?? this.postProcessing,
+    );
+  }
+
+  bool get hasCustomSearch => searchBehavior?.enabled ?? false;
+  bool get hasURLHandler => urlHandler?.enabled ?? false;
+  bool get hasCustomMatching => trackMatching?.customMatching ?? false;
+  bool get hasPostProcessing => postProcessing?.enabled ?? false;
+}
+
+/// Custom search behavior configuration
+class SearchBehavior {
+  final bool enabled;
+  final String? placeholder;
+  final bool primary;
+  final String? icon;
+  final String? thumbnailRatio; // "square" (1:1), "wide" (16:9), "portrait" (2:3)
+  final int? thumbnailWidth;
+  final int? thumbnailHeight;
+
+  const SearchBehavior({
+    required this.enabled,
+    this.placeholder,
+    this.primary = false,
+    this.icon,
+    this.thumbnailRatio,
+    this.thumbnailWidth,
+    this.thumbnailHeight,
+  });
+
+  factory SearchBehavior.fromJson(Map<String, dynamic> json) {
+    return SearchBehavior(
+      enabled: json['enabled'] as bool? ?? false,
+      placeholder: json['placeholder'] as String?,
+      primary: json['primary'] as bool? ?? false,
+      icon: json['icon'] as String?,
+      thumbnailRatio: json['thumbnailRatio'] as String?,
+      thumbnailWidth: json['thumbnailWidth'] as int?,
+      thumbnailHeight: json['thumbnailHeight'] as int?,
+    );
+  }
+
+  /// 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);
+      case 'portrait': // 2:3 - Poster style
+        return (defaultSize * 2 / 3, defaultSize);
+      case 'square': // 1:1 - Album art style
+      default:
+        return (defaultSize, defaultSize);
+    }
+  }
+}
+
+/// Custom track matching configuration
+class TrackMatching {
+  final bool customMatching;
+  final String? strategy; // "isrc", "name", "duration", "custom"
+  final int durationTolerance; // in seconds
+
+  const TrackMatching({
+    required this.customMatching,
+    this.strategy,
+    this.durationTolerance = 3,
+  });
+
+  factory TrackMatching.fromJson(Map<String, dynamic> json) {
+    return TrackMatching(
+      customMatching: json['customMatching'] as bool? ?? false,
+      strategy: json['strategy'] as String?,
+      durationTolerance: json['durationTolerance'] as int? ?? 3,
+    );
+  }
+}
+
+/// Post-processing configuration
+class PostProcessing {
+  final bool enabled;
+  final List<PostProcessingHook> hooks;
+
+  const PostProcessing({
+    required this.enabled,
+    this.hooks = const [],
+  });
+
+  factory PostProcessing.fromJson(Map<String, dynamic> json) {
+    return PostProcessing(
+      enabled: json['enabled'] as bool? ?? false,
+      hooks: (json['hooks'] as List<dynamic>?)
+          ?.map((h) => PostProcessingHook.fromJson(h as Map<String, dynamic>))
+          .toList() ?? [],
+    );
+  }
+}
+
+/// URL handler configuration for custom URL patterns
+class URLHandler {
+  final bool enabled;
+  final List<String> patterns;
+
+  const URLHandler({
+    required this.enabled,
+    this.patterns = const [],
+  });
+
+  factory URLHandler.fromJson(Map<String, dynamic> json) {
+    return URLHandler(
+      enabled: json['enabled'] as bool? ?? false,
+      patterns: (json['patterns'] as List<dynamic>?)?.cast<String>() ?? [],
+    );
+  }
+
+  /// Check if a URL matches any of the patterns
+  bool matchesURL(String url) {
+    if (!enabled || patterns.isEmpty) return false;
+    final lowerUrl = url.toLowerCase();
+    for (final pattern in patterns) {
+      if (lowerUrl.contains(pattern.toLowerCase())) {
+        return true;
+      }
+    }
+    return false;
+  }
+}
+
+/// A post-processing hook
+class PostProcessingHook {
+  final String id;
+  final String name;
+  final String? description;
+  final bool defaultEnabled;
+  final List<String> supportedFormats;
+
+  const PostProcessingHook({
+    required this.id,
+    required this.name,
+    this.description,
+    this.defaultEnabled = false,
+    this.supportedFormats = const [],
+  });
+
+  factory PostProcessingHook.fromJson(Map<String, dynamic> json) {
+    return PostProcessingHook(
+      id: json['id'] as String? ?? '',
+      name: json['name'] as String? ?? '',
+      description: json['description'] as String?,
+      defaultEnabled: json['defaultEnabled'] as bool? ?? false,
+      supportedFormats: (json['supportedFormats'] as List<dynamic>?)?.cast<String>() ?? [],
+    );
+  }
+}
+
+/// Represents a quality option for download providers
+class QualityOption {
+  final String id;
+  final String label;
+  final String? description;
+  final List<QualitySpecificSetting> settings; // Quality-specific settings
+
+  const QualityOption({
+    required this.id,
+    required this.label,
+    this.description,
+    this.settings = const [],
+  });
+
+  factory QualityOption.fromJson(Map<String, dynamic> json) {
+    return QualityOption(
+      id: json['id'] as String? ?? '',
+      label: json['label'] as String? ?? '',
+      description: json['description'] as String?,
+      settings: (json['settings'] as List<dynamic>?)
+          ?.map((s) => QualitySpecificSetting.fromJson(s as Map<String, dynamic>))
+          .toList() ?? [],
+    );
+  }
+}
+
+/// Represents a setting that's specific to a quality option
+class QualitySpecificSetting {
+  final String key;
+  final String label;
+  final String type; // 'string', 'number', 'boolean', 'select'
+  final dynamic defaultValue;
+  final String? description;
+  final List<String>? options; // For select type
+  final bool required;
+  final bool secret;
+
+  const QualitySpecificSetting({
+    required this.key,
+    required this.label,
+    required this.type,
+    this.defaultValue,
+    this.description,
+    this.options,
+    this.required = false,
+    this.secret = false,
+  });
+
+  factory QualitySpecificSetting.fromJson(Map<String, dynamic> json) {
+    return QualitySpecificSetting(
+      key: json['key'] as String? ?? '',
+      label: json['label'] as String? ?? '',
+      type: json['type'] as String? ?? 'string',
+      defaultValue: json['default'],
+      description: json['description'] as String?,
+      options: (json['options'] as List<dynamic>?)?.cast<String>(),
+      required: json['required'] as bool? ?? false,
+      secret: json['secret'] as bool? ?? false,
+    );
+  }
+}
+
+/// Represents a setting field for an extension
+class ExtensionSetting {
+  final String key;
+  final String label;
+  final String type; // 'string', 'number', 'boolean', 'select'
+  final dynamic defaultValue;
+  final String? description;
+  final List<String>? options; // For select type
+  final bool required;
+
+  const ExtensionSetting({
+    required this.key,
+    required this.label,
+    required this.type,
+    this.defaultValue,
+    this.description,
+    this.options,
+    this.required = false,
+  });
+
+  factory ExtensionSetting.fromJson(Map<String, dynamic> json) {
+    return ExtensionSetting(
+      key: json['key'] as String? ?? '',
+      label: json['label'] as String? ?? '',
+      type: json['type'] as String? ?? 'string',
+      defaultValue: json['default'],
+      description: json['description'] as String?,
+      options: (json['options'] as List<dynamic>?)?.cast<String>(),
+      required: json['required'] as bool? ?? false,
+    );
+  }
+}
+
+/// State for extension management
+class ExtensionState {
+  final List<Extension> extensions;
+  final List<String> providerPriority;
+  final List<String> metadataProviderPriority;
+  final bool isLoading;
+  final String? error;
+  final bool isInitialized;
+
+  const ExtensionState({
+    this.extensions = const [],
+    this.providerPriority = const [],
+    this.metadataProviderPriority = const [],
+    this.isLoading = false,
+    this.error,
+    this.isInitialized = false,
+  });
+
+  ExtensionState copyWith({
+    List<Extension>? extensions,
+    List<String>? providerPriority,
+    List<String>? metadataProviderPriority,
+    bool? isLoading,
+    String? error,
+    bool? isInitialized,
+  }) {
+    return ExtensionState(
+      extensions: extensions ?? this.extensions,
+      providerPriority: providerPriority ?? this.providerPriority,
+      metadataProviderPriority: metadataProviderPriority ?? this.metadataProviderPriority,
+      isLoading: isLoading ?? this.isLoading,
+      error: error,
+      isInitialized: isInitialized ?? this.isInitialized,
+    );
+  }
+}
+
+
+/// Provider for managing extensions
+class ExtensionNotifier extends Notifier<ExtensionState> {
+  @override
+  ExtensionState build() {
+    return const ExtensionState();
+  }
+
+  /// Initialize the extension system
+  Future<void> initialize(String extensionsDir, String dataDir) async {
+    if (state.isInitialized) return;
+    
+    state = state.copyWith(isLoading: true, error: null);
+    
+    try {
+      await PlatformBridge.initExtensionSystem(extensionsDir, dataDir);
+      await loadExtensions(extensionsDir);
+      await loadProviderPriority();
+      await loadMetadataProviderPriority();
+      state = state.copyWith(isInitialized: true, isLoading: false);
+      _log.i('Extension system initialized');
+    } catch (e) {
+      _log.e('Failed to initialize extension system: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+    }
+  }
+
+  /// Load all extensions from directory
+  Future<void> loadExtensions(String dirPath) async {
+    state = state.copyWith(isLoading: true, error: null);
+    
+    try {
+      final result = await PlatformBridge.loadExtensionsFromDir(dirPath);
+      _log.d('Load extensions result: $result');
+      await refreshExtensions();
+      state = state.copyWith(isLoading: false);
+    } catch (e) {
+      _log.e('Failed to load extensions: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+    }
+  }
+
+  /// Refresh the list of installed extensions
+  Future<void> refreshExtensions() async {
+    try {
+      final list = await PlatformBridge.getInstalledExtensions();
+      final extensions = list.map((e) => Extension.fromJson(e)).toList();
+      state = state.copyWith(extensions: extensions);
+      _log.d('Loaded ${extensions.length} extensions');
+      
+      // Log search behavior for extensions that have it
+      for (final ext in extensions) {
+        if (ext.searchBehavior != null) {
+          _log.d('Extension ${ext.id}: thumbnailRatio=${ext.searchBehavior!.thumbnailRatio}');
+        }
+      }
+    } catch (e) {
+      _log.e('Failed to refresh extensions: $e');
+      state = state.copyWith(error: e.toString());
+    }
+  }
+
+  /// Clear any error state
+  void clearError() {
+    state = state.copyWith(error: null);
+  }
+
+  /// Install extension from file (auto-upgrades if already installed with newer version)
+  Future<bool> installExtension(String filePath) async {
+    state = state.copyWith(isLoading: true, error: null);
+    
+    try {
+      final result = await PlatformBridge.loadExtensionFromPath(filePath);
+      _log.i('Installed extension: ${result['name']}');
+      await refreshExtensions();
+      state = state.copyWith(isLoading: false);
+      return true;
+    } catch (e) {
+      _log.e('Failed to install extension: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+      return false;
+    }
+  }
+
+  /// Check if a package file is an upgrade for an existing extension
+  /// Returns: {extension_id, current_version, new_version, can_upgrade, is_installed}
+  Future<Map<String, dynamic>> checkExtensionUpgrade(String filePath) async {
+    try {
+      return await PlatformBridge.checkExtensionUpgrade(filePath);
+    } catch (e) {
+      _log.e('Failed to check extension upgrade: $e');
+      return {'error': e.toString()};
+    }
+  }
+
+  /// Upgrade an existing extension from a new package file
+  Future<bool> upgradeExtension(String filePath) async {
+    state = state.copyWith(isLoading: true, error: null);
+    
+    try {
+      final result = await PlatformBridge.upgradeExtension(filePath);
+      _log.i('Upgraded extension: ${result['display_name']} to v${result['version']}');
+      await refreshExtensions();
+      state = state.copyWith(isLoading: false);
+      return true;
+    } catch (e) {
+      _log.e('Failed to upgrade extension: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+      return false;
+    }
+  }
+
+  /// Uninstall/remove an extension
+  Future<bool> removeExtension(String extensionId) async {
+    state = state.copyWith(isLoading: true, error: null);
+    
+    try {
+      await PlatformBridge.removeExtension(extensionId);
+      _log.i('Removed extension: $extensionId');
+      await refreshExtensions();
+      state = state.copyWith(isLoading: false);
+      return true;
+    } catch (e) {
+      _log.e('Failed to remove extension: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+      return false;
+    }
+  }
+
+  /// Enable or disable an extension
+  Future<void> setExtensionEnabled(String extensionId, bool enabled) async {
+    try {
+      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);
+        }
+        return e;
+      }).toList();
+      
+      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');
+        }
+      }
+    } catch (e) {
+      _log.e('Failed to set extension enabled: $e');
+      state = state.copyWith(error: e.toString());
+    }
+  }
+
+  /// Get settings for an extension
+  Future<Map<String, dynamic>> getExtensionSettings(String extensionId) async {
+    try {
+      return await PlatformBridge.getExtensionSettings(extensionId);
+    } catch (e) {
+      _log.e('Failed to get extension settings: $e');
+      return {};
+    }
+  }
+
+  /// Update settings for an extension
+  Future<void> setExtensionSettings(String extensionId, Map<String, dynamic> settings) async {
+    try {
+      await PlatformBridge.setExtensionSettings(extensionId, settings);
+      _log.d('Updated settings for extension: $extensionId');
+    } catch (e) {
+      _log.e('Failed to set extension settings: $e');
+      state = state.copyWith(error: e.toString());
+    }
+  }
+
+  /// Load provider priority order
+  Future<void> loadProviderPriority() async {
+    try {
+      final priority = await PlatformBridge.getProviderPriority();
+      state = state.copyWith(providerPriority: priority);
+    } catch (e) {
+      _log.e('Failed to load provider priority: $e');
+    }
+  }
+
+  /// Set provider priority order
+  Future<void> setProviderPriority(List<String> priority) async {
+    try {
+      await PlatformBridge.setProviderPriority(priority);
+      state = state.copyWith(providerPriority: priority);
+      _log.d('Updated provider priority: $priority');
+    } catch (e) {
+      _log.e('Failed to set provider priority: $e');
+      state = state.copyWith(error: e.toString());
+    }
+  }
+
+  /// Load metadata provider priority order
+  Future<void> loadMetadataProviderPriority() async {
+    try {
+      final priority = await PlatformBridge.getMetadataProviderPriority();
+      state = state.copyWith(metadataProviderPriority: priority);
+    } catch (e) {
+      _log.e('Failed to load metadata provider priority: $e');
+    }
+  }
+
+  /// Set metadata provider priority order
+  Future<void> setMetadataProviderPriority(List<String> priority) async {
+    try {
+      await PlatformBridge.setMetadataProviderPriority(priority);
+      state = state.copyWith(metadataProviderPriority: priority);
+      _log.d('Updated metadata provider priority: $priority');
+    } catch (e) {
+      _log.e('Failed to set metadata provider priority: $e');
+      state = state.copyWith(error: e.toString());
+    }
+  }
+
+  /// Cleanup all extensions (call on app close)
+  Future<void> cleanup() async {
+    try {
+      await PlatformBridge.cleanupExtensions();
+      _log.d('Extensions cleaned up');
+    } catch (e) {
+      _log.e('Failed to cleanup extensions: $e');
+    }
+  }
+
+  /// Get extension by ID
+  Extension? getExtension(String extensionId) {
+    try {
+      return state.extensions.firstWhere((ext) => ext.id == extensionId);
+    } catch (_) {
+      return null;
+    }
+  }
+
+  /// Get all enabled extensions
+  List<Extension> get enabledExtensions {
+    return state.extensions.where((ext) => ext.enabled).toList();
+  }
+
+  /// Get all download providers (built-in + extensions)
+  List<String> getAllDownloadProviders() {
+    final providers = ['tidal', 'qobuz', 'amazon'];
+    for (final ext in state.extensions) {
+      if (ext.enabled && ext.hasDownloadProvider) {
+        providers.add(ext.id);
+      }
+    }
+    return providers;
+  }
+
+  /// Get all metadata providers (built-in + extensions)
+  List<String> getAllMetadataProviders() {
+    final providers = ['deezer', 'spotify'];
+    for (final ext in state.extensions) {
+      if (ext.enabled && ext.hasMetadataProvider) {
+        providers.add(ext.id);
+      }
+    }
+    return providers;
+  }
+  /// Get all extensions that provide custom search
+  List<Extension> get searchProviders {
+    return state.extensions.where((ext) => ext.enabled && ext.hasCustomSearch).toList();
+  }
+}
+
+final extensionProvider = NotifierProvider<ExtensionNotifier, ExtensionState>(
+  ExtensionNotifier.new,
+);

lib/providers/settings_provider.dart

@@ -60,18 +60,16 @@ class SettingsNotifier extends Notifier<AppSettings> {
 
   /// 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 && 
+    // Only apply if both fields are set
+    if (state.spotifyClientId.isNotEmpty && 
         state.spotifyClientSecret.isNotEmpty) {
       await PlatformBridge.setSpotifyCredentials(
         state.spotifyClientId,
         state.spotifyClientSecret,
       );
-    } else {
-      // Clear to use default
-      await PlatformBridge.setSpotifyCredentials('', '');
     }
+    // Note: If credentials are empty, Spotify API will return error
+    // User should use Deezer as metadata source instead
   }
 
   void setDefaultService(String service) {
@@ -197,12 +195,41 @@ class SettingsNotifier extends Notifier<AppSettings> {
     _saveSettings();
   }
 
+  void setSearchProvider(String? provider) {
+    if (provider == null || provider.isEmpty) {
+      state = state.copyWith(clearSearchProvider: true);
+    } else {
+      state = state.copyWith(searchProvider: provider);
+    }
+    _saveSettings();
+  }
+
   void setEnableLogging(bool enabled) {
     state = state.copyWith(enableLogging: enabled);
     _saveSettings();
     // Sync logging state to LogBuffer
     LogBuffer.loggingEnabled = enabled;
   }
+
+  void setUseExtensionProviders(bool enabled) {
+    state = state.copyWith(useExtensionProviders: enabled);
+    _saveSettings();
+  }
+
+  void setSeparateSingles(bool enabled) {
+    state = state.copyWith(separateSingles: enabled);
+    _saveSettings();
+  }
+
+  void setAlbumFolderStructure(String structure) {
+    state = state.copyWith(albumFolderStructure: structure);
+    _saveSettings();
+  }
+
+  void setShowExtensionStore(bool enabled) {
+    state = state.copyWith(showExtensionStore: enabled);
+    _saveSettings();
+  }
 }
 
 final settingsProvider = NotifierProvider<SettingsNotifier, AppSettings>(

lib/providers/store_provider.dart

@@ -0,0 +1,286 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/services/platform_bridge.dart';
+import 'package:spotiflac_android/utils/logger.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+
+final _log = AppLogger('StoreProvider');
+
+/// Extension categories
+class StoreCategory {
+  static const String metadata = 'metadata';
+  static const String download = 'download';
+  static const String utility = 'utility';
+  static const String lyrics = 'lyrics';
+  static const String integration = 'integration';
+
+  static const List<String> all = [metadata, download, utility, lyrics, integration];
+
+  static String getDisplayName(String category) {
+    switch (category) {
+      case metadata:
+        return 'Metadata';
+      case download:
+        return 'Download';
+      case utility:
+        return 'Utility';
+      case lyrics:
+        return 'Lyrics';
+      case integration:
+        return 'Integration';
+      default:
+        return category;
+    }
+  }
+}
+
+/// Represents an extension in the store
+class StoreExtension {
+  final String id;
+  final String name;
+  final String displayName;
+  final String version;
+  final String author;
+  final String description;
+  final String downloadUrl;
+  final String? iconUrl;
+  final String category;
+  final List<String> tags;
+  final int downloads;
+  final String updatedAt;
+  final String? minAppVersion;
+  final bool isInstalled;
+  final String? installedVersion;
+  final bool hasUpdate;
+
+  const StoreExtension({
+    required this.id,
+    required this.name,
+    required this.displayName,
+    required this.version,
+    required this.author,
+    required this.description,
+    required this.downloadUrl,
+    this.iconUrl,
+    required this.category,
+    this.tags = const [],
+    this.downloads = 0,
+    required this.updatedAt,
+    this.minAppVersion,
+    this.isInstalled = false,
+    this.installedVersion,
+    this.hasUpdate = false,
+  });
+
+  factory StoreExtension.fromJson(Map<String, dynamic> json) {
+    return StoreExtension(
+      id: json['id'] as String? ?? '',
+      name: json['name'] as String? ?? '',
+      displayName: json['display_name'] as String? ?? json['name'] as String? ?? '',
+      version: json['version'] as String? ?? '0.0.0',
+      author: json['author'] as String? ?? 'Unknown',
+      description: json['description'] as String? ?? '',
+      downloadUrl: json['download_url'] as String? ?? '',
+      iconUrl: json['icon_url'] as String?,
+      category: json['category'] as String? ?? 'utility',
+      tags: (json['tags'] as List<dynamic>?)?.cast<String>() ?? [],
+      downloads: json['downloads'] as int? ?? 0,
+      updatedAt: json['updated_at'] as String? ?? '',
+      minAppVersion: json['min_app_version'] as String?,
+      isInstalled: json['is_installed'] as bool? ?? false,
+      installedVersion: json['installed_version'] as String?,
+      hasUpdate: json['has_update'] as bool? ?? false,
+    );
+  }
+}
+
+/// State for extension store
+class StoreState {
+  final List<StoreExtension> extensions;
+  final String? selectedCategory;
+  final String searchQuery;
+  final bool isLoading;
+  final bool isDownloading;
+  final String? downloadingId;
+  final String? error;
+  final bool isInitialized;
+
+  const StoreState({
+    this.extensions = const [],
+    this.selectedCategory,
+    this.searchQuery = '',
+    this.isLoading = false,
+    this.isDownloading = false,
+    this.downloadingId,
+    this.error,
+    this.isInitialized = false,
+  });
+
+  StoreState copyWith({
+    List<StoreExtension>? extensions,
+    String? selectedCategory,
+    bool clearCategory = false,
+    String? searchQuery,
+    bool? isLoading,
+    bool? isDownloading,
+    String? downloadingId,
+    bool clearDownloadingId = false,
+    String? error,
+    bool clearError = false,
+    bool? isInitialized,
+  }) {
+    return StoreState(
+      extensions: extensions ?? this.extensions,
+      selectedCategory: clearCategory ? null : (selectedCategory ?? this.selectedCategory),
+      searchQuery: searchQuery ?? this.searchQuery,
+      isLoading: isLoading ?? this.isLoading,
+      isDownloading: isDownloading ?? this.isDownloading,
+      downloadingId: clearDownloadingId ? null : (downloadingId ?? this.downloadingId),
+      error: clearError ? null : (error ?? this.error),
+      isInitialized: isInitialized ?? this.isInitialized,
+    );
+  }
+
+  /// Get filtered extensions based on category and search
+  List<StoreExtension> get filteredExtensions {
+    var result = extensions;
+
+    if (selectedCategory != null) {
+      result = result.where((e) => e.category == selectedCategory).toList();
+    }
+
+    if (searchQuery.isNotEmpty) {
+      final query = searchQuery.toLowerCase();
+      result = result.where((e) =>
+        e.name.toLowerCase().contains(query) ||
+        e.displayName.toLowerCase().contains(query) ||
+        e.description.toLowerCase().contains(query) ||
+        e.author.toLowerCase().contains(query) ||
+        e.tags.any((t) => t.toLowerCase().contains(query))
+      ).toList();
+    }
+
+    return result;
+  }
+}
+
+/// Provider for managing extension store
+class StoreNotifier extends Notifier<StoreState> {
+  @override
+  StoreState build() {
+    return const StoreState();
+  }
+
+  /// Initialize the store
+  Future<void> initialize(String cacheDir) async {
+    if (state.isInitialized) return;
+
+    state = state.copyWith(isLoading: true, clearError: true);
+
+    try {
+      await PlatformBridge.initExtensionStore(cacheDir);
+      await refresh();
+      state = state.copyWith(isInitialized: true, isLoading: false);
+      _log.i('Extension store initialized');
+    } catch (e) {
+      _log.e('Failed to initialize store: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+    }
+  }
+
+  /// Refresh extensions from store
+  Future<void> refresh({bool forceRefresh = false}) async {
+    state = state.copyWith(isLoading: true, clearError: true);
+
+    try {
+      final extensions = await PlatformBridge.getStoreExtensions(forceRefresh: forceRefresh);
+      state = state.copyWith(
+        extensions: extensions.map((e) => StoreExtension.fromJson(e)).toList(),
+        isLoading: false,
+      );
+      _log.d('Loaded ${state.extensions.length} extensions from store');
+    } catch (e) {
+      _log.e('Failed to refresh store: $e');
+      state = state.copyWith(isLoading: false, error: e.toString());
+    }
+  }
+
+  /// Set category filter
+  void setCategory(String? category) {
+    if (category == null) {
+      state = state.copyWith(clearCategory: true);
+    } else {
+      state = state.copyWith(selectedCategory: category);
+    }
+  }
+
+  /// Set search query
+  void setSearchQuery(String query) {
+    state = state.copyWith(searchQuery: query);
+  }
+
+  /// Clear search
+  void clearSearch() {
+    state = state.copyWith(searchQuery: '', clearCategory: true);
+  }
+
+  /// Download and install extension
+  Future<bool> installExtension(String extensionId, String tempDir, String extensionsDir) async {
+    state = state.copyWith(isDownloading: true, downloadingId: extensionId, clearError: true);
+
+    try {
+      _log.i('Downloading extension: $extensionId');
+      final downloadPath = await PlatformBridge.downloadStoreExtension(extensionId, tempDir);
+
+      _log.i('Installing extension from: $downloadPath');
+      final extNotifier = ref.read(extensionProvider.notifier);
+      final success = await extNotifier.installExtension(downloadPath);
+
+      if (success) {
+        _log.i('Extension installed: $extensionId');
+        await refresh();
+      }
+
+      state = state.copyWith(isDownloading: false, clearDownloadingId: true);
+      return success;
+    } catch (e) {
+      _log.e('Failed to install extension: $e');
+      state = state.copyWith(isDownloading: false, clearDownloadingId: true, error: e.toString());
+      return false;
+    }
+  }
+
+  /// Update an installed extension
+  Future<bool> updateExtension(String extensionId, String tempDir) async {
+    state = state.copyWith(isDownloading: true, downloadingId: extensionId, clearError: true);
+
+    try {
+      _log.i('Downloading update for: $extensionId');
+      final downloadPath = await PlatformBridge.downloadStoreExtension(extensionId, tempDir);
+
+      _log.i('Upgrading extension from: $downloadPath');
+      final extNotifier = ref.read(extensionProvider.notifier);
+      final success = await extNotifier.upgradeExtension(downloadPath);
+
+      if (success) {
+        _log.i('Extension updated: $extensionId');
+        await refresh();
+      }
+
+      state = state.copyWith(isDownloading: false, clearDownloadingId: true);
+      return success;
+    } catch (e) {
+      _log.e('Failed to update extension: $e');
+      state = state.copyWith(isDownloading: false, clearDownloadingId: true, error: e.toString());
+      return false;
+    }
+  }
+
+  /// Clear error
+  void clearError() {
+    state = state.copyWith(clearError: true);
+  }
+}
+
+final storeProvider = NotifierProvider<StoreNotifier, StoreState>(
+  StoreNotifier.new,
+);

lib/providers/track_provider.dart

@@ -2,6 +2,8 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:spotiflac_android/models/track.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
 import 'package:spotiflac_android/utils/logger.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
 
 final _log = AppLogger('TrackProvider');
 
@@ -18,6 +20,7 @@ class TrackState {
   final List<ArtistAlbum>? artistAlbums; // For artist page
   final List<SearchArtist>? searchArtists; // For search results
   final bool hasSearchText; // For back button handling
+  final String? searchExtensionId; // Extension ID used for current search results
 
   const TrackState({
     this.tracks = const [],
@@ -32,6 +35,7 @@ class TrackState {
     this.artistAlbums,
     this.searchArtists,
     this.hasSearchText = false,
+    this.searchExtensionId,
   });
 
   bool get hasContent => tracks.isNotEmpty || artistAlbums != null || (searchArtists != null && searchArtists!.isNotEmpty);
@@ -49,6 +53,7 @@ class TrackState {
     List<ArtistAlbum>? artistAlbums,
     List<SearchArtist>? searchArtists,
     bool? hasSearchText,
+    String? searchExtensionId,
   }) {
     return TrackState(
       tracks: tracks ?? this.tracks,
@@ -63,6 +68,7 @@ class TrackState {
       artistAlbums: artistAlbums ?? this.artistAlbums,
       searchArtists: searchArtists ?? this.searchArtists,
       hasSearchText: hasSearchText ?? this.hasSearchText,
+      searchExtensionId: searchExtensionId,
     );
   }
 }
@@ -125,6 +131,59 @@ class TrackNotifier extends Notifier<TrackState> {
     state = TrackState(isLoading: true, hasSearchText: state.hasSearchText);
 
     try {
+      // First, check if any extension can handle this URL
+      final extensionHandler = await PlatformBridge.findURLHandler(url);
+      if (extensionHandler != null) {
+        _log.i('Found extension URL handler: $extensionHandler for URL: $url');
+        final result = await PlatformBridge.handleURLWithExtension(url);
+        if (!_isRequestValid(requestId)) return;
+        
+        if (result != null) {
+          final type = result['type'] as String?;
+          final extensionId = result['extension_id'] as String?;
+          
+          if (type == 'track' && result['track'] != null) {
+            final trackData = result['track'] as Map<String, dynamic>;
+            final track = _parseSearchTrack(trackData, source: extensionId);
+            state = TrackState(
+              tracks: [track],
+              isLoading: false,
+              coverUrl: track.coverUrl,
+              searchExtensionId: extensionId,
+            );
+            return;
+          } else if ((type == 'album' || type == 'playlist') && result['tracks'] != null) {
+            final trackList = result['tracks'] as List<dynamic>;
+            final tracks = trackList.map((t) => _parseSearchTrack(t as Map<String, dynamic>, source: extensionId)).toList();
+            state = TrackState(
+              tracks: tracks,
+              isLoading: false,
+              albumId: result['album']?['id'] as String?,
+              albumName: result['name'] as String? ?? result['album']?['name'] as String?,
+              playlistName: type == 'playlist' ? result['name'] as String? : null,
+              coverUrl: result['cover_url'] as String?,
+              searchExtensionId: extensionId,
+            );
+            return;
+          } else if (type == 'artist' && result['artist'] != null) {
+            final artistData = result['artist'] as Map<String, dynamic>;
+            final albumsList = artistData['albums'] as List<dynamic>? ?? [];
+            final albums = albumsList.map((a) => _parseArtistAlbum(a as Map<String, dynamic>)).toList();
+            state = TrackState(
+              tracks: [],
+              isLoading: false,
+              artistId: artistData['id'] as String?,
+              artistName: artistData['name'] as String?,
+              coverUrl: artistData['image_url'] as String? ?? artistData['images'] as String?,
+              artistAlbums: albums,
+              searchExtensionId: extensionId,
+            );
+            return;
+          }
+        }
+      }
+      
+      // No extension handler found, try Spotify URL parsing
       final parsed = await PlatformBridge.parseSpotifyUrl(url);
       if (!_isRequestValid(requestId)) return; // Request cancelled
       
@@ -210,12 +269,43 @@ class TrackNotifier extends Notifier<TrackState> {
     state = TrackState(isLoading: true, hasSearchText: state.hasSearchText);
 
     try {
+      // Check if extension providers should be used for search
+      final settings = ref.read(settingsProvider);
+      final extensionState = ref.read(extensionProvider);
+      final hasActiveMetadataExtensions = extensionState.extensions.any(
+        (e) => e.enabled && e.hasMetadataProvider,
+      );
+      final useExtensions = settings.useExtensionProviders && hasActiveMetadataExtensions;
+
       // Use Deezer or Spotify based on settings
       final source = metadataSource ?? 'deezer';
       
-      _log.i('Search started: source=$source, query="$query"');
+      _log.i('Search started: source=$source, query="$query", useExtensions=$useExtensions');
       
       Map<String, dynamic> results;
+      List<Track> extensionTracks = [];
+      
+      // Try extension providers first if enabled
+      if (useExtensions) {
+        try {
+          _log.d('Calling extension search API...');
+          final extResults = await PlatformBridge.searchTracksWithExtensions(query, limit: 20);
+          _log.i('Extensions returned ${extResults.length} tracks');
+          
+          // Parse extension results
+          for (final t in extResults) {
+            try {
+              extensionTracks.add(_parseSearchTrack(t));
+            } catch (e) {
+              _log.e('Failed to parse extension track: $e', e);
+            }
+          }
+        } catch (e) {
+          _log.w('Extension search failed, falling back to built-in: $e');
+        }
+      }
+      
+      // Also search with built-in providers
       if (source == 'deezer') {
         _log.d('Calling Deezer search API...');
         results = await PlatformBridge.searchDeezerAll(query, trackLimit: 20, artistLimit: 5);
@@ -238,11 +328,26 @@ class TrackNotifier extends Notifier<TrackState> {
       
       // Parse tracks with error handling per item
       final tracks = <Track>[];
+      
+      // Add extension tracks first (they have priority)
+      tracks.addAll(extensionTracks);
+      
+      // Add built-in provider tracks, avoiding duplicates by ISRC
+      final existingIsrcs = extensionTracks
+          .where((t) => t.isrc != null && t.isrc!.isNotEmpty)
+          .map((t) => t.isrc!)
+          .toSet();
+      
       for (int i = 0; i < trackList.length; i++) {
         final t = trackList[i];
         try {
           if (t is Map<String, dynamic>) {
-            tracks.add(_parseSearchTrack(t));
+            final track = _parseSearchTrack(t);
+            // Skip if we already have this track from extensions
+            if (track.isrc != null && existingIsrcs.contains(track.isrc)) {
+              continue;
+            }
+            tracks.add(track);
           } else {
             _log.w('Track[$i] is not a Map: ${t.runtimeType}');
           }
@@ -266,7 +371,7 @@ class TrackNotifier extends Notifier<TrackState> {
         }
       }
       
-      _log.i('Search complete: ${tracks.length} tracks, ${artists.length} artists parsed successfully');
+      _log.i('Search complete: ${tracks.length} tracks (${extensionTracks.length} from extensions), ${artists.length} artists parsed successfully');
       
       state = TrackState(
         tracks: tracks,
@@ -281,6 +386,53 @@ class TrackNotifier extends Notifier<TrackState> {
     }
   }
 
+  /// Perform custom search using a specific extension
+  Future<void> customSearch(String extensionId, String query, {Map<String, dynamic>? options}) async {
+    // Increment request ID to cancel any pending requests
+    final requestId = ++_currentRequestId;
+
+    // Preserve hasSearchText during search
+    state = TrackState(isLoading: true, hasSearchText: state.hasSearchText);
+
+    try {
+      _log.i('Custom search started: extension=$extensionId, query="$query"');
+      
+      final results = await PlatformBridge.customSearchWithExtension(extensionId, query, options: options);
+      
+      if (!_isRequestValid(requestId)) {
+        _log.w('Custom search request cancelled (requestId=$requestId)');
+        return;
+      }
+      
+      _log.i('Custom search returned ${results.length} tracks');
+      
+      // Parse tracks with error handling per item, setting source to extension ID
+      final tracks = <Track>[];
+      for (int i = 0; i < results.length; i++) {
+        final t = results[i];
+        try {
+          tracks.add(_parseSearchTrack(t, source: extensionId));
+        } catch (e) {
+          _log.e('Failed to parse custom search track[$i]: $e', e);
+        }
+      }
+      
+      _log.i('Custom search complete: ${tracks.length} tracks parsed (source=$extensionId)');
+      
+      state = TrackState(
+        tracks: tracks,
+        searchArtists: [], // Custom search doesn't return artists
+        isLoading: false,
+        hasSearchText: state.hasSearchText,
+        searchExtensionId: extensionId, // Store which extension was used
+      );
+    } catch (e, stackTrace) {
+      if (!_isRequestValid(requestId)) return;
+      _log.e('Custom search failed: $e', e, stackTrace);
+      state = TrackState(isLoading: false, error: e.toString(), hasSearchText: state.hasSearchText);
+    }
+  }
+
   Future<void> checkAvailability(int index) async {
     if (index < 0 || index >= state.tracks.length) return;
 
@@ -344,7 +496,7 @@ class TrackNotifier extends Notifier<TrackState> {
     );
   }
 
-  Track _parseSearchTrack(Map<String, dynamic> data) {
+  Track _parseSearchTrack(Map<String, dynamic> data, {String? source}) {
     // Handle duration_ms which might be int or double
     int durationMs = 0;
     final durationValue = data['duration_ms'];
@@ -366,6 +518,8 @@ class TrackNotifier extends Notifier<TrackState> {
       trackNumber: data['track_number'] as int?,
       discNumber: data['disc_number'] as int?,
       releaseDate: data['release_date']?.toString(),
+      source: source ?? data['source']?.toString() ?? data['provider_id']?.toString(),
+      albumType: data['album_type']?.toString(),
     );
   }
 

lib/screens/album_screen.dart

@@ -7,6 +7,7 @@ import 'package:spotiflac_android/models/download_item.dart';
 import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
+import 'package:spotiflac_android/widgets/download_service_picker.dart';
 
 /// Simple in-memory cache for album tracks
 class _AlbumCache {
@@ -316,10 +317,16 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
   void _downloadTrack(BuildContext context, Track track) {
     final settings = ref.read(settingsProvider);
     if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, (quality, service) {
-        ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
-      }, trackName: track.name, artistName: track.artistName, coverUrl: track.coverUrl);
+      DownloadServicePicker.show(
+        context,
+        trackName: track.name,
+        artistName: track.artistName,
+        coverUrl: track.coverUrl,
+        onSelect: (quality, service) {
+          ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
+          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
+        },
+      );
     } else {
       ref.read(downloadQueueProvider.notifier).addToQueue(track, settings.defaultService);
       ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
@@ -331,84 +338,21 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
     if (tracks == null || tracks.isEmpty) return;
     final settings = ref.read(settingsProvider);
     if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, (quality, service) {
-        ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, service, qualityOverride: quality);
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
-      }, trackName: '${tracks.length} tracks', artistName: widget.albumName);
+      DownloadServicePicker.show(
+        context,
+        trackName: '${tracks.length} tracks',
+        artistName: widget.albumName,
+        onSelect: (quality, service) {
+          ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, service, qualityOverride: quality);
+          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
+        },
+      );
     } else {
       ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, settings.defaultService);
       ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
     }
   }
 
-  void _showQualityPicker(BuildContext context, void Function(String quality, String service) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
-    final colorScheme = Theme.of(context).colorScheme;
-    final settings = ref.read(settingsProvider);
-    String selectedService = settings.defaultService;
-    
-    showModalBottomSheet(
-      context: context,
-      backgroundColor: colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
-      isScrollControlled: true,
-      builder: (context) => StatefulBuilder(
-        builder: (context, setModalState) => SafeArea(
-          child: SingleChildScrollView(
-            child: Column(
-              mainAxisSize: MainAxisSize.min,
-              crossAxisAlignment: CrossAxisAlignment.start,
-              children: [
-                if (trackName != null) ...[
-                  _TrackInfoHeader(trackName: trackName, artistName: artistName, coverUrl: coverUrl),
-                  Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-                ] else ...[
-                  const SizedBox(height: 8),
-                  Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
-                ],
-                // Service selector
-                Padding(
-                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-                  child: Text('Download From', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
-                ),
-                Padding(
-                  padding: const EdgeInsets.symmetric(horizontal: 20),
-                  child: Row(
-                    children: [
-                      _ServiceChip(label: 'Tidal', isSelected: selectedService == 'tidal', onTap: () => setModalState(() => selectedService = 'tidal')),
-                      const SizedBox(width: 8),
-                      _ServiceChip(label: 'Qobuz', isSelected: selectedService == 'qobuz', onTap: () => setModalState(() => selectedService = 'qobuz')),
-                      const SizedBox(width: 8),
-                      _ServiceChip(label: 'Amazon', isSelected: selectedService == 'amazon', onTap: () => setModalState(() => selectedService = 'amazon')),
-                    ],
-                  ),
-                ),
-                Padding(
-                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-                  child: Text('Select Quality', style: Theme.of(context).textTheme.titleMedium?.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', selectedService); }),
-                _QualityOption(title: 'Hi-Res FLAC', subtitle: '24-bit / up to 96kHz', icon: Icons.high_quality, onTap: () { Navigator.pop(context); onSelect('HI_RES', selectedService); }),
-                _QualityOption(title: 'Hi-Res FLAC Max', subtitle: '24-bit / up to 192kHz', icon: Icons.four_k, onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS', selectedService); }),
-                const SizedBox(height: 16),
-              ],
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-
   /// Build error widget with special handling for rate limit (429)
   Widget _buildErrorWidget(String error, ColorScheme colorScheme) {
     final isRateLimit = error.contains('429') || 
@@ -473,148 +417,6 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
   }
 }
 
-class _QualityOption extends StatelessWidget {
-  final String title;
-  final String subtitle;
-  final IconData icon;
-  final VoidCallback onTap;
-
-  const _QualityOption({required this.title, required this.subtitle, required this.icon, required this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return ListTile(
-      contentPadding: const EdgeInsets.symmetric(horizontal: 24, vertical: 4),
-      leading: Container(padding: const EdgeInsets.all(10), decoration: BoxDecoration(color: colorScheme.primaryContainer, borderRadius: BorderRadius.circular(12)), child: Icon(icon, color: colorScheme.onPrimaryContainer, size: 20)),
-      title: Text(title, style: const TextStyle(fontWeight: FontWeight.w500)),
-      subtitle: Text(subtitle, style: TextStyle(color: colorScheme.onSurfaceVariant)),
-      onTap: onTap,
-    );
-  }
-}
-
-class _ServiceChip extends StatelessWidget {
-  final String label;
-  final bool isSelected;
-  final VoidCallback onTap;
-  const _ServiceChip({required this.label, required this.isSelected, required this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Expanded(
-      child: GestureDetector(
-        onTap: onTap,
-        child: AnimatedContainer(
-          duration: const Duration(milliseconds: 200),
-          padding: const EdgeInsets.symmetric(vertical: 10),
-          decoration: BoxDecoration(
-            color: isSelected ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
-            borderRadius: BorderRadius.circular(12),
-            border: isSelected ? null : Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-          ),
-          child: Text(
-            label,
-            textAlign: TextAlign.center,
-            style: TextStyle(
-              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
-              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-}
-
-class _TrackInfoHeader extends StatefulWidget {
-  final String trackName;
-  final String? artistName;
-  final String? coverUrl;
-  const _TrackInfoHeader({required this.trackName, this.artistName, this.coverUrl});
-
-  @override
-  State<_TrackInfoHeader> createState() => _TrackInfoHeaderState();
-}
-
-class _TrackInfoHeaderState extends State<_TrackInfoHeader> {
-  bool _expanded = false;
-  bool _isOverflowing = false;
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Material(
-      color: Colors.transparent,
-      child: InkWell(
-        onTap: _isOverflowing ? () => setState(() => _expanded = !_expanded) : null,
-        borderRadius: const BorderRadius.only(topLeft: Radius.circular(28), topRight: Radius.circular(28)),
-        child: Column(
-          children: [
-            const SizedBox(height: 8),
-            Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2))),
-            Padding(
-              padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
-              child: Row(
-                children: [
-                  ClipRRect(
-                    borderRadius: BorderRadius.circular(8),
-                    child: widget.coverUrl != null
-                        ? Image.network(widget.coverUrl!, width: 56, height: 56, fit: BoxFit.cover,
-                            errorBuilder: (_, e, s) => Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)))
-                        : Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)),
-                  ),
-                  const SizedBox(width: 12),
-                  Expanded(
-                    child: LayoutBuilder(
-                      builder: (context, constraints) {
-                        final titleStyle = Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600);
-                        final titleSpan = TextSpan(text: widget.trackName, style: titleStyle);
-                        final titlePainter = TextPainter(text: titleSpan, maxLines: 1, textDirection: TextDirection.ltr)..layout(maxWidth: constraints.maxWidth);
-                        final titleOverflows = titlePainter.didExceedMaxLines;
-                        
-                        WidgetsBinding.instance.addPostFrameCallback((_) {
-                          if (mounted && _isOverflowing != titleOverflows) {
-                            setState(() => _isOverflowing = titleOverflows);
-                          }
-                        });
-                        
-                        return Column(
-                          crossAxisAlignment: CrossAxisAlignment.start,
-                          children: [
-                            Text(
-                              widget.trackName,
-                              style: titleStyle,
-                              maxLines: _expanded ? 10 : 1,
-                              overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
-                            ),
-                            if (widget.artistName != null) ...[
-                              const SizedBox(height: 2),
-                              Text(
-                                widget.artistName!,
-                                style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
-                                maxLines: _expanded ? 3 : 1,
-                                overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
-                              ),
-                            ],
-                          ],
-                        );
-                      },
-                    ),
-                  ),
-                  if (_isOverflowing || _expanded)
-                    Icon(_expanded ? Icons.expand_less : Icons.expand_more, color: colorScheme.onSurfaceVariant, size: 20),
-                ],
-              ),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
-
 /// Separate Consumer widget for each track - only rebuilds when this specific track's status changes
 class _AlbumTrackItem extends ConsumerWidget {
   final Track track;

lib/screens/home_tab.dart

@@ -8,12 +8,14 @@ import 'package:spotiflac_android/models/track.dart';
 import 'package:spotiflac_android/providers/track_provider.dart';
 import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
 import 'package:spotiflac_android/screens/track_metadata_screen.dart';
 import 'package:spotiflac_android/screens/album_screen.dart';
 import 'package:spotiflac_android/screens/artist_screen.dart';
 import 'package:spotiflac_android/services/csv_import_service.dart';
 import 'package:spotiflac_android/screens/playlist_screen.dart';
 import 'package:spotiflac_android/models/download_item.dart';
+import 'package:spotiflac_android/widgets/download_service_picker.dart';
 
 class HomeTab extends ConsumerStatefulWidget {
   const HomeTab({super.key});
@@ -78,12 +80,31 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
   }
 
   Future<void> _performSearch(String query) async {
-    // Skip if same query already searched
-    if (_lastSearchQuery == query) return;
-    _lastSearchQuery = query;
-    
     final settings = ref.read(settingsProvider);
-    await ref.read(trackProvider.notifier).search(query, metadataSource: settings.metadataSource);
+    final extState = ref.read(extensionProvider);
+    final searchProvider = settings.searchProvider;
+    
+    // Skip if same query already searched with same provider
+    final searchKey = '${searchProvider ?? 'default'}:$query';
+    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);
+      }
+      await ref.read(trackProvider.notifier).search(query, metadataSource: settings.metadataSource);
+    }
     ref.read(settingsProvider.notifier).setHasSearchedBefore();
   }
 
@@ -173,10 +194,16 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
       final settings = ref.read(settingsProvider);
       
       if (settings.askQualityBeforeDownload) {
-        _showQualityPicker(context, (quality, service) {
-          ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
-          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
-        }, trackName: track.name, artistName: track.artistName, coverUrl: track.coverUrl);
+        DownloadServicePicker.show(
+          context,
+          trackName: track.name,
+          artistName: track.artistName,
+          coverUrl: track.coverUrl,
+          onSelect: (quality, service) {
+            ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
+            ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
+          },
+        );
       } else {
         ref.read(downloadQueueProvider.notifier).addToQueue(track, settings.defaultService);
         ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
@@ -184,107 +211,23 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     }
   }
 
-  void _showQualityPicker(BuildContext context, void Function(String quality, String service) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
-    final colorScheme = Theme.of(context).colorScheme;
-    final settings = ref.read(settingsProvider);
-    String selectedService = settings.defaultService;
-    
-    showModalBottomSheet(
-      context: context,
-      backgroundColor: colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
-      isScrollControlled: true,
-      builder: (context) => StatefulBuilder(
-        builder: (context, setModalState) => SafeArea(
-          child: SingleChildScrollView(
-            child: Column(
-              mainAxisSize: MainAxisSize.min,
-              crossAxisAlignment: CrossAxisAlignment.start,
-              children: [
-                if (trackName != null) ...[
-                  _TrackInfoHeader(trackName: trackName, artistName: artistName, coverUrl: coverUrl),
-                  Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-                ] else ...[
-                  const SizedBox(height: 8),
-                  Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
-                ],
-                // Service selector
-                Padding(
-                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-                  child: Text('Download From', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
-                ),
-                Padding(
-                  padding: const EdgeInsets.symmetric(horizontal: 20),
-                  child: Row(
-                    children: [
-                      _ServiceChip(label: 'Tidal', isSelected: selectedService == 'tidal', onTap: () => setModalState(() => selectedService = 'tidal')),
-                      const SizedBox(width: 8),
-                      _ServiceChip(label: 'Qobuz', isSelected: selectedService == 'qobuz', onTap: () => setModalState(() => selectedService = 'qobuz')),
-                      const SizedBox(width: 8),
-                      _ServiceChip(label: 'Amazon', isSelected: selectedService == 'amazon', onTap: () => setModalState(() => selectedService = 'amazon')),
-                    ],
-                  ),
-                ),
-                Padding(
-                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-                  child: Text('Select Quality', style: Theme.of(context).textTheme.titleMedium?.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',
-                  icon: Icons.music_note,
-                  onTap: () { Navigator.pop(context); onSelect('LOSSLESS', selectedService); },
-                ),
-                _QualityPickerOption(
-                  title: 'Hi-Res FLAC',
-                  subtitle: '24-bit / up to 96kHz',
-                  icon: Icons.high_quality,
-                  onTap: () { Navigator.pop(context); onSelect('HI_RES', selectedService); },
-                ),
-                _QualityPickerOption(
-                  title: 'Hi-Res FLAC Max',
-                  subtitle: '24-bit / up to 192kHz',
-                  icon: Icons.four_k,
-                  onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS', selectedService); },
-                ),
-                const SizedBox(height: 16),
-              ],
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-
   Future<void> _importCsv(BuildContext context, WidgetRef ref) async {
     // Show loading dialog with progress
     int currentProgress = 0;
     int totalTracks = 0;
     
     // Use StatefulBuilder to update dialog content
-    final dialogContext = context;
     bool dialogShown = false;
     StateSetter? setDialogState;
     
     void showProgressDialog() {
-      if (dialogShown) return;
+      if (dialogShown || !mounted) return;
       dialogShown = true;
       showDialog(
-        context: dialogContext,
+        context: this.context,
         barrierDismissible: false,
-        builder: (context) => StatefulBuilder(
-          builder: (context, setState) {
+        builder: (dialogCtx) => StatefulBuilder(
+          builder: (dialogCtx, setState) {
             setDialogState = setState;
             return AlertDialog(
               content: Column(
@@ -318,25 +261,27 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     
     // Close progress dialog
     if (dialogShown && mounted) {
-      Navigator.of(dialogContext).pop();
+      Navigator.of(this.context).pop();
     }
     
     if (tracks.isNotEmpty) {
       final settings = ref.read(settingsProvider);
       
+      if (!mounted) return;
+      
       // Optionally show confirmation dialog
       final confirmed = await showDialog<bool>(
-        context: context,
-        builder: (context) => AlertDialog(
+        context: this.context,
+        builder: (dialogCtx) => AlertDialog(
           title: const Text('Import Playlist'),
           content: Text('Found ${tracks.length} tracks in CSV. Add them to download queue?'),
           actions: [
             TextButton(
-              onPressed: () => Navigator.pop(context, false),
+              onPressed: () => Navigator.pop(dialogCtx, false),
               child: const Text('Cancel'),
             ),
             FilledButton(
-              onPressed: () => Navigator.pop(context, true),
+              onPressed: () => Navigator.pop(dialogCtx, true),
               child: const Text('Import'),
             ),
           ],
@@ -346,7 +291,7 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
       if (confirmed == true) {
         ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, settings.defaultService);
         if (mounted) {
-           ScaffoldMessenger.of(context).showSnackBar(
+           ScaffoldMessenger.of(this.context).showSnackBar(
             SnackBar(
               content: Text('Added ${tracks.length} tracks to queue'),
               action: SnackBarAction(
@@ -385,6 +330,10 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     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));
+    
     final colorScheme = Theme.of(context).colorScheme;
     final hasResults = _isTyping || tracks.isNotEmpty || (searchArtists != null && searchArtists.isNotEmpty) || isLoading;
     final screenHeight = MediaQuery.of(context).size.height;
@@ -836,6 +785,32 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     ));
   }
 
+  /// Get search hint based on selected provider
+  String _getSearchHint() {
+    final settings = ref.read(settingsProvider);
+    final searchProvider = settings.searchProvider;
+    final extState = ref.read(extensionProvider);
+    
+    // If extension system not initialized yet, show default hint
+    if (!extState.isInitialized) {
+      return 'Paste Spotify URL or search...';
+    }
+    
+    if (searchProvider != null && searchProvider.isNotEmpty) {
+      final ext = extState.extensions.where((e) => e.id == searchProvider).firstOrNull;
+      // Only show extension placeholder if extension exists AND is enabled
+      if (ext != null && ext.enabled) {
+        if (ext.searchBehavior?.placeholder != null) {
+          return ext.searchBehavior!.placeholder!;
+        }
+        return 'Search with ${ext.displayName}...';
+      }
+      // Extension not found or disabled - clear the search provider setting
+      // and return default hint
+    }
+    return 'Paste Spotify URL or search...';
+  }
+
   Widget _buildSearchBar(ColorScheme colorScheme) {
     final hasText = _urlController.text.isNotEmpty;
     
@@ -844,7 +819,7 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
       focusNode: _searchFocusNode,
       autofocus: false,
       decoration: InputDecoration(
-        hintText: 'Paste Spotify URL or search...',
+        hintText: _getSearchHint(),
         filled: true,
         fillColor: colorScheme.surfaceContainerHighest,
         border: OutlineInputBorder(
@@ -910,147 +885,6 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
 
 }
 
-class _QualityPickerOption extends StatelessWidget {
-  final String title;
-  final String subtitle;
-  final IconData icon;
-  final VoidCallback onTap;
-  const _QualityPickerOption({required this.title, required this.subtitle, required this.icon, required this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return ListTile(
-      contentPadding: const EdgeInsets.symmetric(horizontal: 24, vertical: 4),
-      leading: Container(padding: const EdgeInsets.all(10), decoration: BoxDecoration(color: colorScheme.primaryContainer, borderRadius: BorderRadius.circular(12)), child: Icon(icon, color: colorScheme.onPrimaryContainer, size: 20)),
-      title: Text(title, style: const TextStyle(fontWeight: FontWeight.w500)),
-      subtitle: Text(subtitle, style: TextStyle(color: colorScheme.onSurfaceVariant)),
-      onTap: onTap,
-    );
-  }
-}
-
-class _ServiceChip extends StatelessWidget {
-  final String label;
-  final bool isSelected;
-  final VoidCallback onTap;
-  const _ServiceChip({required this.label, required this.isSelected, required this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Expanded(
-      child: GestureDetector(
-        onTap: onTap,
-        child: AnimatedContainer(
-          duration: const Duration(milliseconds: 200),
-          padding: const EdgeInsets.symmetric(vertical: 10),
-          decoration: BoxDecoration(
-            color: isSelected ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
-            borderRadius: BorderRadius.circular(12),
-            border: isSelected ? null : Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-          ),
-          child: Text(
-            label,
-            textAlign: TextAlign.center,
-            style: TextStyle(
-              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
-              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-}
-
-class _TrackInfoHeader extends StatefulWidget {
-  final String trackName;
-  final String? artistName;
-  final String? coverUrl;
-  const _TrackInfoHeader({required this.trackName, this.artistName, this.coverUrl});
-
-  @override
-  State<_TrackInfoHeader> createState() => _TrackInfoHeaderState();
-}
-
-class _TrackInfoHeaderState extends State<_TrackInfoHeader> {
-  bool _expanded = false;
-  bool _isOverflowing = false;
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Material(
-      color: Colors.transparent,
-      child: InkWell(
-        onTap: _isOverflowing ? () => setState(() => _expanded = !_expanded) : null,
-        borderRadius: const BorderRadius.only(topLeft: Radius.circular(28), topRight: Radius.circular(28)),
-        child: Column(
-          children: [
-            const SizedBox(height: 8),
-            Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2))),
-            Padding(
-              padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
-              child: Row(
-                children: [
-                  ClipRRect(
-                    borderRadius: BorderRadius.circular(8),
-                    child: widget.coverUrl != null
-                        ? Image.network(widget.coverUrl!, width: 56, height: 56, fit: BoxFit.cover,
-                            errorBuilder: (_, e, s) => Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)))
-                        : Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)),
-                  ),
-                  const SizedBox(width: 12),
-                  Expanded(
-                    child: LayoutBuilder(
-                      builder: (context, constraints) {
-                        final titleStyle = Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600);
-                        final titleSpan = TextSpan(text: widget.trackName, style: titleStyle);
-                        final titlePainter = TextPainter(text: titleSpan, maxLines: 1, textDirection: TextDirection.ltr)..layout(maxWidth: constraints.maxWidth);
-                        final titleOverflows = titlePainter.didExceedMaxLines;
-                        
-                        WidgetsBinding.instance.addPostFrameCallback((_) {
-                          if (mounted && _isOverflowing != titleOverflows) {
-                            setState(() => _isOverflowing = titleOverflows);
-                          }
-                        });
-                        
-                        return Column(
-                          crossAxisAlignment: CrossAxisAlignment.start,
-                          children: [
-                            Text(
-                              widget.trackName,
-                              style: titleStyle,
-                              maxLines: _expanded ? 10 : 1,
-                              overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
-                            ),
-                            if (widget.artistName != null) ...[
-                              const SizedBox(height: 2),
-                              Text(
-                                widget.artistName!,
-                                style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
-                                maxLines: _expanded ? 3 : 1,
-                                overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
-                              ),
-                            ],
-                          ],
-                        );
-                      },
-                    ),
-                  ),
-                  if (_isOverflowing || _expanded)
-                    Icon(_expanded ? Icons.expand_less : Icons.expand_more, color: colorScheme.onSurfaceVariant, size: 20),
-                ],
-              ),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
-
 /// Separate Consumer widget for each track item - only rebuilds when this specific track's status changes
 class _TrackItemWithStatus extends ConsumerWidget {
   final Track track;
@@ -1080,6 +914,28 @@ class _TrackItemWithStatus extends ConsumerWidget {
       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;
+    
+    if (extensionId != null && extensionId.isNotEmpty) {
+      final extState = ref.watch(extensionProvider);
+      final extension = extState.extensions.where((e) => e.id == extensionId).firstOrNull;
+      if (extension?.searchBehavior != null) {
+        final size = extension!.searchBehavior!.getThumbnailSize(defaultSize: 56);
+        thumbWidth = size.$1;
+        thumbHeight = size.$2;
+        // Debug: log only when using custom size
+        if (thumbWidth != 56 || thumbHeight != 56) {
+          debugPrint('[Thumbnail] ${track.name}: using ${thumbWidth.toInt()}x${thumbHeight.toInt()} from ${extension.id}');
+        }
+      }
+    }
+    
     final isQueued = queueItem != null;
     final isDownloading = queueItem?.status == DownloadStatus.downloading;
     final isFinalizing = queueItem?.status == DownloadStatus.finalizing;
@@ -1100,21 +956,21 @@ class _TrackItemWithStatus extends ConsumerWidget {
             padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
             child: Row(
               children: [
-                // Album art
+                // Album art with dynamic size based on extension config
                 ClipRRect(
                   borderRadius: BorderRadius.circular(10),
                   child: track.coverUrl != null
                       ? CachedNetworkImage(
                           imageUrl: track.coverUrl!,
-                          width: 56,
-                          height: 56,
+                          width: thumbWidth,
+                          height: thumbHeight,
                           fit: BoxFit.cover,
-                          memCacheWidth: 112,
-                          memCacheHeight: 112,
+                          memCacheWidth: (thumbWidth * 2).toInt(),
+                          memCacheHeight: (thumbHeight * 2).toInt(),
                         )
                       : Container(
-                          width: 56,
-                          height: 56,
+                          width: thumbWidth,
+                          height: thumbHeight,
                           color: colorScheme.surfaceContainerHighest,
                           child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant),
                         ),
@@ -1151,7 +1007,7 @@ class _TrackItemWithStatus extends ConsumerWidget {
           Divider(
             height: 1,
             thickness: 1,
-            indent: 80,
+            indent: thumbWidth + 24, // Adjust divider indent based on thumbnail width
             endIndent: 12,
             color: colorScheme.outlineVariant.withValues(alpha: 0.3),
           ),

lib/screens/main_shell.dart

@@ -6,6 +6,7 @@ import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
 import 'package:spotiflac_android/providers/track_provider.dart';
 import 'package:spotiflac_android/screens/home_tab.dart';
+import 'package:spotiflac_android/screens/store_tab.dart';
 import 'package:spotiflac_android/screens/queue_tab.dart';
 import 'package:spotiflac_android/screens/settings/settings_tab.dart';
 import 'package:spotiflac_android/services/share_intent_service.dart';
@@ -121,6 +122,8 @@ 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
+      FocusScope.of(context).unfocus();
     }
   }
 
@@ -172,6 +175,7 @@ class _MainShellState extends ConsumerState<MainShell> {
   Widget build(BuildContext context) {
     final queueState = ref.watch(downloadQueueProvider.select((s) => s.queuedCount));
     final trackState = ref.watch(trackProvider);
+    final showStore = ref.watch(settingsProvider.select((s) => s.showExtensionStore));
     
     // Check if keyboard is visible (bottom inset > 0 means keyboard is showing)
     final isKeyboardVisible = MediaQuery.of(context).viewInsets.bottom > 0;
@@ -185,6 +189,61 @@ class _MainShellState extends ConsumerState<MainShell> {
                    !trackState.isLoading &&
                    !isKeyboardVisible;
 
+    // Build tabs and destinations based on settings
+    final tabs = <Widget>[
+      const HomeTab(),
+      QueueTab(
+        parentPageController: _pageController,
+        parentPageIndex: 1,
+        nextPageIndex: showStore ? 2 : 3,
+      ),
+      if (showStore) const StoreTab(),
+      const SettingsTab(),
+    ];
+
+    final destinations = <NavigationDestination>[
+      const NavigationDestination(
+        icon: Icon(Icons.home_outlined),
+        selectedIcon: Icon(Icons.home),
+        label: 'Home',
+      ),
+      NavigationDestination(
+        icon: Badge(
+          isLabelVisible: queueState > 0,
+          label: Text('$queueState'),
+          child: const Icon(Icons.history_outlined),
+        ),
+        selectedIcon: Badge(
+          isLabelVisible: queueState > 0,
+          label: Text('$queueState'),
+          child: const Icon(Icons.history),
+        ),
+        label: 'History',
+      ),
+      if (showStore)
+        const NavigationDestination(
+          icon: Icon(Icons.store_outlined),
+          selectedIcon: Icon(Icons.store),
+          label: 'Store',
+        ),
+      const NavigationDestination(
+        icon: Icon(Icons.settings_outlined),
+        selectedIcon: Icon(Icons.settings),
+        label: 'Settings',
+      ),
+    ];
+
+    // Clamp current index if tabs changed
+    final maxIndex = tabs.length - 1;
+    if (_currentIndex > maxIndex) {
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        if (mounted) {
+          setState(() => _currentIndex = maxIndex);
+          _pageController.jumpToPage(maxIndex);
+        }
+      });
+    }
+
     return PopScope(
       canPop: canPop,
       onPopInvokedWithResult: (didPop, result) async {
@@ -201,45 +260,17 @@ class _MainShellState extends ConsumerState<MainShell> {
         body: PageView(
           controller: _pageController,
           onPageChanged: _onPageChanged,
-          physics: const BouncingScrollPhysics(),
-          children: const [
-            HomeTab(),
-            QueueTab(),
-            SettingsTab(),
-          ],
+          physics: const ClampingScrollPhysics(),
+          children: tabs,
         ),
         bottomNavigationBar: NavigationBar(
-          selectedIndex: _currentIndex,
+          selectedIndex: _currentIndex.clamp(0, maxIndex),
           onDestinationSelected: _onNavTap,
           animationDuration: const Duration(milliseconds: 200),
           backgroundColor: Theme.of(context).brightness == Brightness.dark
               ? Color.alphaBlend(Colors.white.withValues(alpha: 0.05), Theme.of(context).colorScheme.surface)
               : Color.alphaBlend(Colors.black.withValues(alpha: 0.03), Theme.of(context).colorScheme.surface),
-          destinations: [
-            const NavigationDestination(
-              icon: Icon(Icons.home_outlined),
-              selectedIcon: Icon(Icons.home),
-              label: 'Home',
-            ),
-            NavigationDestination(
-              icon: Badge(
-                isLabelVisible: queueState > 0,
-                label: Text('$queueState'),
-                child: const Icon(Icons.history_outlined),
-              ),
-              selectedIcon: Badge(
-                isLabelVisible: queueState > 0,
-                label: Text('$queueState'),
-                child: const Icon(Icons.history),
-              ),
-              label: 'History',
-            ),
-            const NavigationDestination(
-              icon: Icon(Icons.settings_outlined),
-              selectedIcon: Icon(Icons.settings),
-              label: 'Settings',
-            ),
-          ],
+          destinations: destinations,
         ),
       ),
     );

lib/screens/playlist_screen.dart

@@ -6,6 +6,7 @@ import 'package:spotiflac_android/models/track.dart';
 import 'package:spotiflac_android/models/download_item.dart';
 import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/widgets/download_service_picker.dart';
 
 /// Playlist detail screen with Material Expressive 3 design
 class PlaylistScreen extends ConsumerWidget {
@@ -168,10 +169,16 @@ class PlaylistScreen extends ConsumerWidget {
   void _downloadTrack(BuildContext context, WidgetRef ref, Track track) {
     final settings = ref.read(settingsProvider);
     if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, ref, (quality, service) {
-        ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
-      }, trackName: track.name, artistName: track.artistName, coverUrl: track.coverUrl);
+      DownloadServicePicker.show(
+        context,
+        trackName: track.name,
+        artistName: track.artistName,
+        coverUrl: track.coverUrl,
+        onSelect: (quality, service) {
+          ref.read(downloadQueueProvider.notifier).addToQueue(track, service, qualityOverride: quality);
+          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
+        },
+      );
     } else {
       ref.read(downloadQueueProvider.notifier).addToQueue(track, settings.defaultService);
       ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added "${track.name}" to queue')));
@@ -182,222 +189,20 @@ class PlaylistScreen extends ConsumerWidget {
     if (tracks.isEmpty) return;
     final settings = ref.read(settingsProvider);
     if (settings.askQualityBeforeDownload) {
-      _showQualityPicker(context, ref, (quality, service) {
-        ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, service, qualityOverride: quality);
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
-      }, trackName: '${tracks.length} tracks', artistName: playlistName);
+      DownloadServicePicker.show(
+        context,
+        trackName: '${tracks.length} tracks',
+        artistName: playlistName,
+        onSelect: (quality, service) {
+          ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, service, qualityOverride: quality);
+          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
+        },
+      );
     } else {
       ref.read(downloadQueueProvider.notifier).addMultipleToQueue(tracks, settings.defaultService);
       ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Added ${tracks.length} tracks to queue')));
     }
   }
-
-  void _showQualityPicker(BuildContext context, WidgetRef ref, void Function(String quality, String service) onSelect, {String? trackName, String? artistName, String? coverUrl}) {
-    final colorScheme = Theme.of(context).colorScheme;
-    final settings = ref.read(settingsProvider);
-    String selectedService = settings.defaultService;
-    
-    showModalBottomSheet(
-      context: context,
-      backgroundColor: colorScheme.surfaceContainerHigh,
-      shape: const RoundedRectangleBorder(borderRadius: BorderRadius.vertical(top: Radius.circular(28))),
-      isScrollControlled: true,
-      builder: (context) => StatefulBuilder(
-        builder: (context, setModalState) => SafeArea(
-          child: SingleChildScrollView(
-            child: Column(
-              mainAxisSize: MainAxisSize.min,
-              crossAxisAlignment: CrossAxisAlignment.start,
-              children: [
-                if (trackName != null) ...[
-                  _TrackInfoHeader(trackName: trackName, artistName: artistName, coverUrl: coverUrl),
-                  Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-                ] else ...[
-                  const SizedBox(height: 8),
-                  Center(child: Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2)))),
-                ],
-                // Service selector
-                Padding(
-                  padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
-                  child: Text('Download From', style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold)),
-                ),
-                Padding(
-                  padding: const EdgeInsets.symmetric(horizontal: 20),
-                  child: Row(
-                    children: [
-                      _ServiceChip(label: 'Tidal', isSelected: selectedService == 'tidal', onTap: () => setModalState(() => selectedService = 'tidal')),
-                      const SizedBox(width: 8),
-                      _ServiceChip(label: 'Qobuz', isSelected: selectedService == 'qobuz', onTap: () => setModalState(() => selectedService = 'qobuz')),
-                      const SizedBox(width: 8),
-                      _ServiceChip(label: 'Amazon', isSelected: selectedService == 'amazon', onTap: () => setModalState(() => selectedService = 'amazon')),
-                    ],
-                  ),
-                ),
-                Padding(padding: const EdgeInsets.fromLTRB(24, 16, 24, 8), child: Text('Select Quality', style: Theme.of(context).textTheme.titleMedium?.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', selectedService); }),
-                _QualityOption(title: 'Hi-Res FLAC', subtitle: '24-bit / up to 96kHz', icon: Icons.high_quality, onTap: () { Navigator.pop(context); onSelect('HI_RES', selectedService); }),
-                _QualityOption(title: 'Hi-Res FLAC Max', subtitle: '24-bit / up to 192kHz', icon: Icons.four_k, onTap: () { Navigator.pop(context); onSelect('HI_RES_LOSSLESS', selectedService); }),
-                const SizedBox(height: 16),
-              ],
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-}
-
-class _QualityOption extends StatelessWidget {
-  final String title;
-  final String subtitle;
-  final IconData icon;
-  final VoidCallback onTap;
-
-  const _QualityOption({required this.title, required this.subtitle, required this.icon, required this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return ListTile(
-      contentPadding: const EdgeInsets.symmetric(horizontal: 24, vertical: 4),
-      leading: Container(padding: const EdgeInsets.all(10), decoration: BoxDecoration(color: colorScheme.primaryContainer, borderRadius: BorderRadius.circular(12)), child: Icon(icon, color: colorScheme.onPrimaryContainer, size: 20)),
-      title: Text(title, style: const TextStyle(fontWeight: FontWeight.w500)),
-      subtitle: Text(subtitle, style: TextStyle(color: colorScheme.onSurfaceVariant)),
-      onTap: onTap,
-    );
-  }
-}
-
-class _ServiceChip extends StatelessWidget {
-  final String label;
-  final bool isSelected;
-  final VoidCallback onTap;
-  const _ServiceChip({required this.label, required this.isSelected, required this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Expanded(
-      child: GestureDetector(
-        onTap: onTap,
-        child: AnimatedContainer(
-          duration: const Duration(milliseconds: 200),
-          padding: const EdgeInsets.symmetric(vertical: 10),
-          decoration: BoxDecoration(
-            color: isSelected ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
-            borderRadius: BorderRadius.circular(12),
-            border: isSelected ? null : Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
-          ),
-          child: Text(
-            label,
-            textAlign: TextAlign.center,
-            style: TextStyle(
-              fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
-              color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-}
-
-class _TrackInfoHeader extends StatefulWidget {
-  final String trackName;
-  final String? artistName;
-  final String? coverUrl;
-  const _TrackInfoHeader({required this.trackName, this.artistName, this.coverUrl});
-
-  @override
-  State<_TrackInfoHeader> createState() => _TrackInfoHeaderState();
-}
-
-class _TrackInfoHeaderState extends State<_TrackInfoHeader> {
-  bool _expanded = false;
-  bool _isOverflowing = false;
-
-  @override
-  Widget build(BuildContext context) {
-    final colorScheme = Theme.of(context).colorScheme;
-    return Material(
-      color: Colors.transparent,
-      child: InkWell(
-        onTap: _isOverflowing ? () => setState(() => _expanded = !_expanded) : null,
-        borderRadius: const BorderRadius.only(topLeft: Radius.circular(28), topRight: Radius.circular(28)),
-        child: Column(
-          children: [
-            const SizedBox(height: 8),
-            Container(width: 40, height: 4, decoration: BoxDecoration(color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4), borderRadius: BorderRadius.circular(2))),
-            Padding(
-              padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
-              child: Row(
-                children: [
-                  ClipRRect(
-                    borderRadius: BorderRadius.circular(8),
-                    child: widget.coverUrl != null
-                        ? Image.network(widget.coverUrl!, width: 56, height: 56, fit: BoxFit.cover,
-                            errorBuilder: (_, e, s) => Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)))
-                        : Container(width: 56, height: 56, color: colorScheme.surfaceContainerHighest, child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant)),
-                  ),
-                  const SizedBox(width: 12),
-                  Expanded(
-                    child: LayoutBuilder(
-                      builder: (context, constraints) {
-                        final titleStyle = Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600);
-                        final titleSpan = TextSpan(text: widget.trackName, style: titleStyle);
-                        final titlePainter = TextPainter(text: titleSpan, maxLines: 1, textDirection: TextDirection.ltr)..layout(maxWidth: constraints.maxWidth);
-                        final titleOverflows = titlePainter.didExceedMaxLines;
-                        
-                        WidgetsBinding.instance.addPostFrameCallback((_) {
-                          if (mounted && _isOverflowing != titleOverflows) {
-                            setState(() => _isOverflowing = titleOverflows);
-                          }
-                        });
-                        
-                        return Column(
-                          crossAxisAlignment: CrossAxisAlignment.start,
-                          children: [
-                            Text(
-                              widget.trackName,
-                              style: titleStyle,
-                              maxLines: _expanded ? 10 : 1,
-                              overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
-                            ),
-                            if (widget.artistName != null) ...[
-                              const SizedBox(height: 2),
-                              Text(
-                                widget.artistName!,
-                                style: Theme.of(context).textTheme.bodyMedium?.copyWith(color: colorScheme.onSurfaceVariant),
-                                maxLines: _expanded ? 3 : 1,
-                                overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
-                              ),
-                            ],
-                          ],
-                        );
-                      },
-                    ),
-                  ),
-                  if (_isOverflowing || _expanded)
-                    Icon(_expanded ? Icons.expand_less : Icons.expand_more, color: colorScheme.onSurfaceVariant, size: 20),
-                ],
-              ),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
 }
 
 /// Separate Consumer widget for each track - only rebuilds when this specific track's status changes

lib/screens/settings/about_page.dart

@@ -13,45 +13,45 @@ class AboutPage extends StatelessWidget {
     final topPadding = MediaQuery.of(context).padding.top;
 
     return PopScope(
-      canPop: true,
+      canPop: true, // Always allow back gesture
       child: Scaffold(
         body: CustomScrollView(
           slivers: [
             // Collapsing App Bar with back button
             SliverAppBar(
-              expandedHeight: 120 + topPadding,
-              collapsedHeight: kToolbarHeight,
-              floating: false,
-              pinned: true,
-              backgroundColor: colorScheme.surface,
-              surfaceTintColor: Colors.transparent,
-              leading: IconButton(
-                icon: const Icon(Icons.arrow_back),
-                onPressed: () => Navigator.pop(context),
-              ),
-              flexibleSpace: LayoutBuilder(
-                builder: (context, constraints) {
-                  final maxHeight = 120 + topPadding;
-                  final minHeight = kToolbarHeight + topPadding;
-                  final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
-                  // When collapsed (expandRatio=0): left=56 to avoid back button
-                  // When expanded (expandRatio=1): left=24 for normal padding
-                  final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
-                  return FlexibleSpaceBar(
-                    expandedTitleScale: 1.0,
-                    titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
-                    title: Text(
-                      'About',
-                      style: TextStyle(
-                        fontSize: 20 + (8 * expandRatio), // 20 -> 28
-                        fontWeight: FontWeight.bold,
-                        color: colorScheme.onSurface,
-                      ),
-                    ),
-                  );
-                },
-              ),
+            expandedHeight: 120 + topPadding,
+            collapsedHeight: kToolbarHeight,
+            floating: false,
+            pinned: true,
+            backgroundColor: colorScheme.surface,
+            surfaceTintColor: Colors.transparent,
+            leading: IconButton(
+              icon: const Icon(Icons.arrow_back),
+              onPressed: () => Navigator.pop(context),
             ),
+            flexibleSpace: LayoutBuilder(
+              builder: (context, constraints) {
+                final maxHeight = 120 + topPadding;
+                final minHeight = kToolbarHeight + topPadding;
+                final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
+                // When collapsed (expandRatio=0): left=56 to avoid back button
+                // When expanded (expandRatio=1): left=24 for normal padding
+                final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
+                return FlexibleSpaceBar(
+                  expandedTitleScale: 1.0,
+                  titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+                  title: Text(
+                    'About',
+                    style: TextStyle(
+                      fontSize: 20 + (8 * expandRatio), // 20 -> 28
+                      fontWeight: FontWeight.bold,
+                      color: colorScheme.onSurface,
+                    ),
+                  ),
+                );
+              },
+            ),
+          ),
 
           // App header card with logo and description
           SliverToBoxAdapter(
@@ -220,7 +220,7 @@ class AboutPage extends StatelessWidget {
           const SliverToBoxAdapter(child: SizedBox(height: 16)),
         ],
       ),
-      ),
+    ),
     );
   }
 

lib/screens/settings/appearance_settings_page.dart

@@ -15,27 +15,27 @@ class AppearanceSettingsPage extends ConsumerWidget {
     final topPadding = MediaQuery.of(context).padding.top;
 
     return PopScope(
-      canPop: true,
+      canPop: true, // Always allow back gesture
       child: Scaffold(
         body: CustomScrollView(
           slivers: [
             // Collapsing App Bar with back button
             SliverAppBar(
-              expandedHeight: 120 + topPadding,
-              collapsedHeight: kToolbarHeight,
-              floating: false,
-              pinned: true,
-              backgroundColor: colorScheme.surface,
-              surfaceTintColor: Colors.transparent,
-              leading: IconButton(
-                icon: const Icon(Icons.arrow_back),
-                onPressed: () => Navigator.pop(context),
-              ),
-              flexibleSpace: _AppBarTitle(
-                title: 'Appearance',
-                topPadding: topPadding,
-              ),
+            expandedHeight: 120 + topPadding,
+            collapsedHeight: kToolbarHeight,
+            floating: false,
+            pinned: true,
+            backgroundColor: colorScheme.surface,
+            surfaceTintColor: Colors.transparent,
+            leading: IconButton(
+              icon: const Icon(Icons.arrow_back),
+              onPressed: () => Navigator.pop(context),
             ),
+            flexibleSpace: _AppBarTitle(
+              title: 'Appearance',
+              topPadding: topPadding,
+            ),
+          ),
 
             // Preview Section
             SliverToBoxAdapter(

lib/screens/settings/download_settings_page.dart

@@ -4,61 +4,68 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:file_picker/file_picker.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
 import 'package:spotiflac_android/widgets/settings_group.dart';
 
 class DownloadSettingsPage extends ConsumerWidget {
   const DownloadSettingsPage({super.key});
+  
+  // Built-in services that support quality options
+  static const _builtInServices = ['tidal', 'qobuz', 'amazon'];
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final settings = ref.watch(settingsProvider);
     final colorScheme = Theme.of(context).colorScheme;
     final topPadding = MediaQuery.of(context).padding.top;
+    
+    // Check if current service is built-in (supports quality options)
+    final isBuiltInService = _builtInServices.contains(settings.defaultService);
 
     return PopScope(
-      canPop: true,
+      canPop: true, // Always allow back gesture
       child: Scaffold(
         body: CustomScrollView(
           slivers: [
             // Collapsing App Bar with back button
             SliverAppBar(
-              expandedHeight: 120 + topPadding,
-              collapsedHeight: kToolbarHeight,
-              floating: false,
-              pinned: true,
-              backgroundColor: colorScheme.surface,
-              surfaceTintColor: Colors.transparent,
-              leading: IconButton(
-                icon: const Icon(Icons.arrow_back),
-                onPressed: () => Navigator.pop(context),
-              ),
-              flexibleSpace: LayoutBuilder(
-                builder: (context, constraints) {
-                  final maxHeight = 120 + topPadding;
-                  final minHeight = kToolbarHeight + topPadding;
-                  final expandRatio =
-                      ((constraints.maxHeight - minHeight) /
-                              (maxHeight - minHeight))
-                          .clamp(0.0, 1.0);
-                  final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
-                  return FlexibleSpaceBar(
-                    expandedTitleScale: 1.0,
-                    titlePadding: EdgeInsets.only(
-                      left: leftPadding,
-                      bottom: 16,
-                    ),
-                    title: Text(
-                      'Download',
-                      style: TextStyle(
-                        fontSize: 20 + (8 * expandRatio), // 20 -> 28
-                        fontWeight: FontWeight.bold,
-                        color: colorScheme.onSurface,
-                      ),
-                    ),
-                  );
-                },
-              ),
+            expandedHeight: 120 + topPadding,
+            collapsedHeight: kToolbarHeight,
+            floating: false,
+            pinned: true,
+            backgroundColor: colorScheme.surface,
+            surfaceTintColor: Colors.transparent,
+            leading: IconButton(
+              icon: const Icon(Icons.arrow_back),
+              onPressed: () => Navigator.pop(context),
             ),
+            flexibleSpace: LayoutBuilder(
+              builder: (context, constraints) {
+                final maxHeight = 120 + topPadding;
+                final minHeight = kToolbarHeight + topPadding;
+                final expandRatio =
+                    ((constraints.maxHeight - minHeight) /
+                            (maxHeight - minHeight))
+                        .clamp(0.0, 1.0);
+                final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
+                return FlexibleSpaceBar(
+                  expandedTitleScale: 1.0,
+                  titlePadding: EdgeInsets.only(
+                    left: leftPadding,
+                    bottom: 16,
+                  ),
+                  title: Text(
+                    'Download',
+                    style: TextStyle(
+                      fontSize: 20 + (8 * expandRatio), // 20 -> 28
+                      fontWeight: FontWeight.bold,
+                      color: colorScheme.onSurface,
+                    ),
+                  ),
+                );
+              },
+            ),
+          ),
 
             // Service section
             const SliverToBoxAdapter(
@@ -87,13 +94,17 @@ class DownloadSettingsPage extends ConsumerWidget {
                   SettingsSwitchItem(
                     icon: Icons.tune,
                     title: 'Ask Before Download',
-                    subtitle: 'Choose quality for each download',
+                    subtitle: isBuiltInService 
+                        ? 'Choose quality for each download'
+                        : 'Select a built-in service to enable',
                     value: settings.askQualityBeforeDownload,
+                    // Not selected visually if extension is active
+                    enabled: isBuiltInService,
                     onChanged: (value) => ref
                         .read(settingsProvider.notifier)
                         .setAskQualityBeforeDownload(value),
                   ),
-                  if (!settings.askQualityBeforeDownload) ...[
+                  if (!settings.askQualityBeforeDownload && isBuiltInService) ...[
                     _QualityOption(
                       title: 'FLAC Lossless',
                       subtitle: '16-bit / 44.1kHz',
@@ -120,6 +131,29 @@ class DownloadSettingsPage extends ConsumerWidget {
                       showDivider: false,
                     ),
                   ],
+                  if (!isBuiltInService) ...[
+                    Padding(
+                      padding: const EdgeInsets.fromLTRB(16, 8, 16, 16),
+                      child: Row(
+                        children: [
+                          Icon(
+                            Icons.info_outline,
+                            size: 16,
+                            color: colorScheme.onSurfaceVariant,
+                          ),
+                          const SizedBox(width: 8),
+                          Expanded(
+                            child: Text(
+                              'Select Tidal, Qobuz, or Amazon above to configure quality',
+                              style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                                color: colorScheme.onSurfaceVariant,
+                              ),
+                            ),
+                          ),
+                        ],
+                      ),
+                    ),
+                  ],
                 ],
               ),
             ),
@@ -151,19 +185,44 @@ class DownloadSettingsPage extends ConsumerWidget {
                         : settings.downloadDirectory,
                     onTap: () => _pickDirectory(context, ref),
                   ),
-                  SettingsItem(
-                    icon: Icons.create_new_folder_outlined,
-                    title: 'Folder Organization',
-                    subtitle: _getFolderOrganizationLabel(
-                      settings.folderOrganization,
-                    ),
-                    onTap: () => _showFolderOrganizationPicker(
-                      context,
-                      ref,
-                      settings.folderOrganization,
-                    ),
-                    showDivider: false,
+                  SettingsSwitchItem(
+                    icon: Icons.library_music_outlined,
+                    title: 'Separate Singles Folder',
+                    subtitle: settings.separateSingles
+                        ? 'Albums/ and Singles/ folders'
+                        : 'All files in same structure',
+                    value: settings.separateSingles,
+                    onChanged: (value) => ref
+                        .read(settingsProvider.notifier)
+                        .setSeparateSingles(value),
                   ),
+                  if (settings.separateSingles)
+                    SettingsItem(
+                      icon: Icons.folder_outlined,
+                      title: 'Album Folder Structure',
+                      subtitle: settings.albumFolderStructure == 'album_only'
+                          ? 'Albums/Album Name/'
+                          : 'Albums/Artist/Album Name/',
+                      onTap: () => _showAlbumFolderStructurePicker(
+                        context,
+                        ref,
+                        settings.albumFolderStructure,
+                      ),
+                    ),
+                  if (!settings.separateSingles)
+                    SettingsItem(
+                      icon: Icons.create_new_folder_outlined,
+                      title: 'Folder Organization',
+                      subtitle: _getFolderOrganizationLabel(
+                        settings.folderOrganization,
+                      ),
+                      onTap: () => _showFolderOrganizationPicker(
+                        context,
+                        ref,
+                        settings.folderOrganization,
+                      ),
+                      showDivider: false,
+                    ),
                 ],
               ),
             ),
@@ -175,6 +234,39 @@ class DownloadSettingsPage extends ConsumerWidget {
     );
   }
 
+  void _showAlbumFolderStructurePicker(BuildContext context, WidgetRef ref, String current) {
+    showModalBottomSheet(
+      context: context,
+      builder: (context) => SafeArea(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            ListTile(
+              leading: const Icon(Icons.folder_outlined),
+              title: const Text('Artist / Album'),
+              subtitle: const Text('Albums/Artist Name/Album Name/'),
+              trailing: current == 'artist_album' ? const Icon(Icons.check) : null,
+              onTap: () {
+                ref.read(settingsProvider.notifier).setAlbumFolderStructure('artist_album');
+                Navigator.pop(context);
+              },
+            ),
+            ListTile(
+              leading: const Icon(Icons.album_outlined),
+              title: const Text('Album Only'),
+              subtitle: const Text('Albums/Album Name/'),
+              trailing: current == 'album_only' ? const Icon(Icons.check) : null,
+              onTap: () {
+                ref.read(settingsProvider.notifier).setAlbumFolderStructure('album_only');
+                Navigator.pop(context);
+              },
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
   void _showFormatEditor(BuildContext context, WidgetRef ref, String current) {
     final controller = TextEditingController(text: current);
     final colorScheme = Theme.of(context).colorScheme;
@@ -481,81 +573,87 @@ class DownloadSettingsPage extends ConsumerWidget {
     showModalBottomSheet(
       context: context,
       backgroundColor: colorScheme.surfaceContainerHigh,
+      isScrollControlled: true,
       shape: const RoundedRectangleBorder(
         borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
       ),
+      constraints: BoxConstraints(
+        maxHeight: MediaQuery.of(context).size.height * 0.7,
+      ),
       builder: (context) => SafeArea(
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Padding(
-              padding: const EdgeInsets.fromLTRB(24, 24, 24, 8),
-              child: Text(
-                'Folder Organization',
-                style: Theme.of(
-                  context,
-                ).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold),
-              ),
-            ),
-            Padding(
-              padding: const EdgeInsets.fromLTRB(24, 0, 24, 16),
-              child: Text(
-                'Organize downloaded files into folders',
-                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                  color: colorScheme.onSurfaceVariant,
+        child: SingleChildScrollView(
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Padding(
+                padding: const EdgeInsets.fromLTRB(24, 24, 24, 8),
+                child: Text(
+                  'Folder Organization',
+                  style: Theme.of(
+                    context,
+                  ).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold),
                 ),
               ),
-            ),
-            _FolderOption(
-              title: 'None',
-              subtitle: 'All files in download folder',
-              example: 'SpotiFLAC/Track.flac',
-              isSelected: current == 'none',
-              onTap: () {
-                ref.read(settingsProvider.notifier).setFolderOrganization('none');
-                Navigator.pop(context);
-              },
-            ),
-            _FolderOption(
-              title: 'By Artist',
-              subtitle: 'Separate folder for each artist',
-              example: 'SpotiFLAC/Artist Name/Track.flac',
-              isSelected: current == 'artist',
-              onTap: () {
-                ref.read(settingsProvider.notifier).setFolderOrganization('artist');
-                Navigator.pop(context);
-              },
-            ),
-            _FolderOption(
-              title: 'By Album',
-              subtitle: 'Separate folder for each album',
-              example: 'SpotiFLAC/Album Name/Track.flac',
-              isSelected: current == 'album',
-              onTap: () {
-                ref.read(settingsProvider.notifier).setFolderOrganization('album');
-                Navigator.pop(context);
-              },
-            ),
-            _FolderOption(
-              title: 'By Artist & Album',
-              subtitle: 'Nested folders for artist and album',
-              example: 'SpotiFLAC/Artist/Album/Track.flac',
-              isSelected: current == 'artist_album',
-              onTap: () {
-                ref.read(settingsProvider.notifier).setFolderOrganization('artist_album');
-                Navigator.pop(context);
-              },
-            ),
-            const SizedBox(height: 16),
-          ],
+              Padding(
+                padding: const EdgeInsets.fromLTRB(24, 0, 24, 16),
+                child: Text(
+                  'Organize downloaded files into folders',
+                  style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                    color: colorScheme.onSurfaceVariant,
+                  ),
+                ),
+              ),
+              _FolderOption(
+                title: 'None',
+                subtitle: 'All files in download folder',
+                example: 'SpotiFLAC/Track.flac',
+                isSelected: current == 'none',
+                onTap: () {
+                  ref.read(settingsProvider.notifier).setFolderOrganization('none');
+                  Navigator.pop(context);
+                },
+              ),
+              _FolderOption(
+                title: 'By Artist',
+                subtitle: 'Separate folder for each artist',
+                example: 'SpotiFLAC/Artist Name/Track.flac',
+                isSelected: current == 'artist',
+                onTap: () {
+                  ref.read(settingsProvider.notifier).setFolderOrganization('artist');
+                  Navigator.pop(context);
+                },
+              ),
+              _FolderOption(
+                title: 'By Album',
+                subtitle: 'Separate folder for each album',
+                example: 'SpotiFLAC/Album Name/Track.flac',
+                isSelected: current == 'album',
+                onTap: () {
+                  ref.read(settingsProvider.notifier).setFolderOrganization('album');
+                  Navigator.pop(context);
+                },
+              ),
+              _FolderOption(
+                title: 'By Artist & Album',
+                subtitle: 'Nested folders for artist and album',
+                example: 'SpotiFLAC/Artist/Album/Track.flac',
+                isSelected: current == 'artist_album',
+                onTap: () {
+                  ref.read(settingsProvider.notifier).setFolderOrganization('artist_album');
+                  Navigator.pop(context);
+                },
+              ),
+              const SizedBox(height: 16),
+            ],
+          ),
         ),
       ),
     );
   }
 }
 
-class _ServiceSelector extends StatelessWidget {
+class _ServiceSelector extends ConsumerWidget {
   final String currentService;
   final ValueChanged<String> onChanged;
   const _ServiceSelector({
@@ -564,31 +662,75 @@ class _ServiceSelector extends StatelessWidget {
   });
 
   @override
-  Widget build(BuildContext context) {
+  Widget build(BuildContext context, WidgetRef ref) {
+    final extState = ref.watch(extensionProvider);
+    
+    // Get enabled extension download providers
+    final extensionProviders = extState.extensions
+        .where((e) => e.enabled && e.hasDownloadProvider)
+        .toList();
+    
+    // Check if current service is an extension that's now disabled
+    final isExtensionService = !['tidal', 'qobuz', 'amazon'].contains(currentService);
+    final isCurrentExtensionEnabled = isExtensionService 
+        ? extensionProviders.any((e) => e.id == currentService)
+        : true;
+    
+    // If current extension is disabled, show it as not selected
+    final effectiveService = isCurrentExtensionEnabled ? currentService : '';
+    
     return Padding(
       padding: const EdgeInsets.all(12),
-      child: Row(
+      child: Column(
         children: [
-          _ServiceChip(
-            icon: Icons.music_note,
-            label: 'Tidal',
-            isSelected: currentService == 'tidal',
-            onTap: () => onChanged('tidal'),
-          ),
-          const SizedBox(width: 8),
-          _ServiceChip(
-            icon: Icons.album,
-            label: 'Qobuz',
-            isSelected: currentService == 'qobuz',
-            onTap: () => onChanged('qobuz'),
-          ),
-          const SizedBox(width: 8),
-          _ServiceChip(
-            icon: Icons.shopping_bag,
-            label: 'Amazon',
-            isSelected: currentService == 'amazon',
-            onTap: () => onChanged('amazon'),
+          Row(
+            children: [
+              _ServiceChip(
+                icon: Icons.music_note,
+                label: 'Tidal',
+                isSelected: effectiveService == 'tidal',
+                onTap: () => onChanged('tidal'),
+              ),
+              const SizedBox(width: 8),
+              _ServiceChip(
+                icon: Icons.album,
+                label: 'Qobuz',
+                isSelected: effectiveService == 'qobuz',
+                onTap: () => onChanged('qobuz'),
+              ),
+              const SizedBox(width: 8),
+              _ServiceChip(
+                icon: Icons.shopping_bag,
+                label: 'Amazon',
+                isSelected: effectiveService == 'amazon',
+                onTap: () => onChanged('amazon'),
+              ),
+            ],
           ),
+          // Show extension download providers if any
+          if (extensionProviders.isNotEmpty) ...[
+            const SizedBox(height: 8),
+            Row(
+              children: [
+                for (int i = 0; i < extensionProviders.length; i++) ...[
+                  if (i > 0) const SizedBox(width: 8),
+                  Expanded(
+                    child: _ServiceChip(
+                      icon: Icons.extension,
+                      label: extensionProviders[i].displayName,
+                      isSelected: effectiveService == extensionProviders[i].id,
+                      onTap: () => onChanged(extensionProviders[i].id),
+                    ),
+                  ),
+                ],
+                // Fill remaining space if less than 3 extensions
+                for (int i = extensionProviders.length; i < 3; i++) ...[
+                  const SizedBox(width: 8),
+                  const Expanded(child: SizedBox()),
+                ],
+              ],
+            ),
+          ],
         ],
       ),
     );

lib/screens/settings/extensions_page.dart

@@ -0,0 +1,724 @@
+import 'dart:io';
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:file_picker/file_picker.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/screens/settings/extension_detail_page.dart';
+import 'package:spotiflac_android/screens/settings/provider_priority_page.dart';
+import 'package:spotiflac_android/screens/settings/metadata_provider_priority_page.dart';
+import 'package:spotiflac_android/widgets/settings_group.dart';
+
+class ExtensionsPage extends ConsumerStatefulWidget {
+  const ExtensionsPage({super.key});
+
+  @override
+  ConsumerState<ExtensionsPage> createState() => _ExtensionsPageState();
+}
+
+class _ExtensionsPageState extends ConsumerState<ExtensionsPage> {
+  @override
+  void initState() {
+    super.initState();
+    _initializeExtensions();
+  }
+
+  Future<void> _initializeExtensions() async {
+    final extState = ref.read(extensionProvider);
+    if (!extState.isInitialized) {
+      final appDir = await getApplicationDocumentsDirectory();
+      final extensionsDir = '${appDir.path}/extensions';
+      final dataDir = '${appDir.path}/extension_data';
+      
+      // Create directories if they don't exist
+      await Directory(extensionsDir).create(recursive: true);
+      await Directory(dataDir).create(recursive: true);
+      
+      await ref.read(extensionProvider.notifier).initialize(extensionsDir, dataDir);
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final extState = ref.watch(extensionProvider);
+    final colorScheme = Theme.of(context).colorScheme;
+    final topPadding = MediaQuery.of(context).padding.top;
+
+    return PopScope(
+      canPop: true, // Always allow back gesture
+      child: Scaffold(
+        body: CustomScrollView(
+          slivers: [
+          // App Bar
+          SliverAppBar(
+            expandedHeight: 120 + topPadding,
+            collapsedHeight: kToolbarHeight,
+            floating: false,
+            pinned: true,
+            backgroundColor: colorScheme.surface,
+            surfaceTintColor: Colors.transparent,
+            leading: IconButton(
+              icon: const Icon(Icons.arrow_back),
+              onPressed: () => Navigator.pop(context),
+            ),
+            flexibleSpace: LayoutBuilder(
+              builder: (context, constraints) {
+                final maxHeight = 120 + topPadding;
+                final minHeight = kToolbarHeight + topPadding;
+                final expandRatio = ((constraints.maxHeight - minHeight) /
+                        (maxHeight - minHeight))
+                    .clamp(0.0, 1.0);
+                final leftPadding = 56 - (32 * expandRatio);
+                return FlexibleSpaceBar(
+                  expandedTitleScale: 1.0,
+                  titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+                  title: Text(
+                    'Extensions',
+                    style: TextStyle(
+                      fontSize: 20 + (8 * expandRatio),
+                      fontWeight: FontWeight.bold,
+                      color: colorScheme.onSurface,
+                    ),
+                  ),
+                );
+              },
+            ),
+          ),
+
+          // Loading indicator
+          if (extState.isLoading)
+            const SliverToBoxAdapter(
+              child: Padding(
+                padding: EdgeInsets.all(32),
+                child: Center(child: CircularProgressIndicator()),
+              ),
+            ),
+
+          // Error message
+          if (extState.error != null)
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Container(
+                  padding: const EdgeInsets.all(12),
+                  decoration: BoxDecoration(
+                    color: colorScheme.errorContainer,
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                  child: Row(
+                    children: [
+                      Icon(Icons.error_outline, color: colorScheme.error),
+                      const SizedBox(width: 12),
+                      Expanded(
+                        child: Text(
+                          extState.error!,
+                          style: TextStyle(color: colorScheme.onErrorContainer),
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+            ),
+
+          // Provider Priority
+          const SliverToBoxAdapter(
+            child: SettingsSectionHeader(title: 'Provider Priority'),
+          ),
+          SliverToBoxAdapter(
+            child: SettingsGroup(
+              children: [
+                _DownloadPriorityItem(),
+                _MetadataPriorityItem(),
+                _SearchProviderSelector(),
+              ],
+            ),
+          ),
+
+          // Installed Extensions
+          const SliverToBoxAdapter(
+            child: SettingsSectionHeader(title: 'Installed Extensions'),
+          ),
+
+          if (extState.extensions.isEmpty && !extState.isLoading)
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.symmetric(horizontal: 16),
+                child: Container(
+                  padding: const EdgeInsets.all(24),
+                  decoration: BoxDecoration(
+                    color: colorScheme.surfaceContainerHighest.withValues(alpha: 0.3),
+                    borderRadius: BorderRadius.circular(16),
+                  ),
+                  child: Column(
+                    children: [
+                      Icon(
+                        Icons.extension_outlined,
+                        size: 48,
+                        color: colorScheme.onSurfaceVariant,
+                      ),
+                      const SizedBox(height: 12),
+                      Text(
+                        'No extensions installed',
+                        style: Theme.of(context).textTheme.titleMedium?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                      const SizedBox(height: 4),
+                      Text(
+                        'Install .spotiflac-ext files to add new providers',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                        textAlign: TextAlign.center,
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+            ),
+
+          if (extState.extensions.isNotEmpty)
+            SliverToBoxAdapter(
+              child: SettingsGroup(
+                children: extState.extensions.asMap().entries.map((entry) {
+                  final index = entry.key;
+                  final ext = entry.value;
+                  return _ExtensionItem(
+                    extension: ext,
+                    showDivider: index < extState.extensions.length - 1,
+                    onTap: () => Navigator.push(
+                      context,
+                      MaterialPageRoute(
+                        builder: (_) => ExtensionDetailPage(extensionId: ext.id),
+                      ),
+                    ),
+                    onToggle: (enabled) => ref
+                        .read(extensionProvider.notifier)
+                        .setExtensionEnabled(ext.id, enabled),
+                  );
+                }).toList(),
+              ),
+            ),
+
+          // Install button
+          SliverToBoxAdapter(
+            child: Padding(
+              padding: const EdgeInsets.all(16),
+              child: FilledButton.icon(
+                onPressed: _installExtension,
+                icon: const Icon(Icons.add),
+                label: const Text('Install Extension'),
+                style: FilledButton.styleFrom(
+                  padding: const EdgeInsets.symmetric(vertical: 16),
+                  shape: RoundedRectangleBorder(
+                    borderRadius: BorderRadius.circular(16),
+                  ),
+                ),
+              ),
+            ),
+          ),
+
+          // Info section
+          SliverToBoxAdapter(
+            child: Padding(
+              padding: const EdgeInsets.fromLTRB(16, 8, 16, 32),
+              child: Container(
+                padding: const EdgeInsets.all(12),
+                decoration: BoxDecoration(
+                  color: colorScheme.tertiaryContainer.withValues(alpha: 0.3),
+                  borderRadius: BorderRadius.circular(12),
+                ),
+                child: Row(
+                  children: [
+                    Icon(Icons.info_outline, size: 20, color: colorScheme.tertiary),
+                    const SizedBox(width: 12),
+                    Expanded(
+                      child: Text(
+                        'Extensions can add new metadata and download providers. '
+                        'Only install extensions from trusted sources.',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onTertiaryContainer,
+                        ),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+          ),
+        ],
+      ),
+    ),
+    );
+  }
+
+  Future<void> _installExtension() async {
+    final result = await FilePicker.platform.pickFiles(
+      type: FileType.any,
+      allowMultiple: false,
+    );
+
+    if (result != null && result.files.isNotEmpty) {
+      final file = result.files.first;
+      if (file.path != null) {
+        if (!file.path!.endsWith('.spotiflac-ext')) {
+          if (mounted) {
+            ScaffoldMessenger.of(context).showSnackBar(
+              const SnackBar(
+                content: Text('Please select a .spotiflac-ext file'),
+              ),
+            );
+          }
+          return;
+        }
+
+        final success = await ref
+            .read(extensionProvider.notifier)
+            .installExtension(file.path!);
+
+        if (mounted) {
+          final extState = ref.read(extensionProvider);
+          String message;
+          if (success) {
+            message = 'Extension installed successfully';
+          } else {
+            // Parse friendly error message
+            message = _getFriendlyErrorMessage(extState.error);
+          }
+          
+          // Clear the error from state to avoid showing it twice (in error container)
+          ref.read(extensionProvider.notifier).clearError();
+          
+          ScaffoldMessenger.of(context).showSnackBar(
+            SnackBar(content: Text(message)),
+          );
+        }
+      }
+    }
+  }
+
+  /// Parse error message to be more user-friendly
+  String _getFriendlyErrorMessage(String? error) {
+    if (error == null) return 'Failed to install extension';
+    
+    String message = error;
+    
+    // Remove PlatformException wrapper if present
+    // Format: PlatformException(ERROR, actual message, null, null)
+    if (message.contains('PlatformException')) {
+      // Try to extract the actual error message
+      final match = RegExp(r'PlatformException\([^,]+,\s*([^,]+(?:,[^,]+)?),').firstMatch(message);
+      if (match != null) {
+        message = match.group(1)?.trim() ?? message;
+      } else {
+        // Fallback: try simpler extraction
+        final simpleMatch = RegExp(r'PlatformException\([^,]+,\s*(.+?),\s*null').firstMatch(message);
+        if (simpleMatch != null) {
+          message = simpleMatch.group(1)?.trim() ?? message;
+        }
+      }
+    }
+    
+    // Clean up any remaining artifacts
+    message = message.replaceAll(RegExp(r',\s*null\s*,\s*null\)?$'), '');
+    message = message.replaceAll(RegExp(r'^\s*,\s*'), '');
+    
+    return message;
+  }
+}
+
+class _ExtensionItem extends StatelessWidget {
+  final Extension extension;
+  final bool showDivider;
+  final VoidCallback onTap;
+  final ValueChanged<bool> onToggle;
+
+  const _ExtensionItem({
+    required this.extension,
+    required this.showDivider,
+    required this.onTap,
+    required this.onToggle,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final hasError = extension.status == 'error';
+
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        InkWell(
+          onTap: onTap,
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+            child: Row(
+              children: [
+                // Extension icon
+                Container(
+                  width: 44,
+                  height: 44,
+                  decoration: BoxDecoration(
+                    color: hasError
+                        ? colorScheme.errorContainer
+                        : colorScheme.primaryContainer,
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                  child: extension.iconPath != null && extension.iconPath!.isNotEmpty
+                      ? ClipRRect(
+                          borderRadius: BorderRadius.circular(12),
+                          child: Image.file(
+                            File(extension.iconPath!),
+                            width: 44,
+                            height: 44,
+                            fit: BoxFit.cover,
+                            errorBuilder: (context, error, stackTrace) => Icon(
+                              hasError ? Icons.error_outline : Icons.extension,
+                              color: hasError
+                                  ? colorScheme.error
+                                  : colorScheme.onPrimaryContainer,
+                            ),
+                          ),
+                        )
+                      : Icon(
+                          hasError ? Icons.error_outline : Icons.extension,
+                          color: hasError
+                              ? colorScheme.error
+                              : colorScheme.onPrimaryContainer,
+                        ),
+                ),
+                const SizedBox(width: 16),
+                // Extension info
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        extension.displayName,
+                        style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                          fontWeight: FontWeight.w500,
+                        ),
+                      ),
+                      const SizedBox(height: 2),
+                      Text(
+                        hasError
+                            ? extension.errorMessage ?? 'Error loading extension'
+                            : 'v${extension.version} by ${extension.author}',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: hasError
+                              ? colorScheme.error
+                              : colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+                // Toggle switch
+                Switch(
+                  value: extension.enabled,
+                  onChanged: hasError ? null : onToggle,
+                ),
+              ],
+            ),
+          ),
+        ),
+        if (showDivider)
+          Divider(
+            height: 1,
+            thickness: 1,
+            indent: 76,
+            endIndent: 16,
+            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+          ),
+      ],
+    );
+  }
+}
+
+class _DownloadPriorityItem extends ConsumerWidget {
+  const _DownloadPriorityItem();
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final extState = ref.watch(extensionProvider);
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    // Check if any extension has download provider
+    final hasDownloadExtensions = extState.extensions
+        .any((e) => e.enabled && e.hasDownloadProvider);
+    
+    return InkWell(
+      onTap: hasDownloadExtensions 
+          ? () => Navigator.push(
+              context,
+              MaterialPageRoute(
+                builder: (_) => const ProviderPriorityPage(),
+              ),
+            )
+          : null,
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+        child: Row(
+          children: [
+            Icon(
+              Icons.download,
+              color: hasDownloadExtensions 
+                  ? colorScheme.onSurfaceVariant 
+                  : colorScheme.outline,
+            ),
+            const SizedBox(width: 16),
+            Expanded(
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Text(
+                    'Download Priority',
+                    style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                      color: hasDownloadExtensions 
+                          ? null 
+                          : colorScheme.outline,
+                    ),
+                  ),
+                  const SizedBox(height: 2),
+                  Text(
+                    hasDownloadExtensions 
+                        ? 'Set download service order'
+                        : 'No extensions with download provider',
+                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: colorScheme.onSurfaceVariant,
+                    ),
+                  ),
+                ],
+              ),
+            ),
+            Icon(
+              Icons.chevron_right,
+              color: hasDownloadExtensions 
+                  ? colorScheme.onSurfaceVariant 
+                  : colorScheme.outline,
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _MetadataPriorityItem extends ConsumerWidget {
+  const _MetadataPriorityItem();
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    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);
+    
+    return InkWell(
+      onTap: hasMetadataExtensions 
+          ? () => Navigator.push(
+              context,
+              MaterialPageRoute(
+                builder: (_) => const MetadataProviderPriorityPage(),
+              ),
+            )
+          : null,
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+        child: Row(
+          children: [
+            Icon(
+              Icons.search,
+              color: hasMetadataExtensions 
+                  ? colorScheme.onSurfaceVariant 
+                  : colorScheme.outline,
+            ),
+            const SizedBox(width: 16),
+            Expanded(
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Text(
+                    'Metadata Priority',
+                    style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                      color: hasMetadataExtensions 
+                          ? null 
+                          : colorScheme.outline,
+                    ),
+                  ),
+                  const SizedBox(height: 2),
+                  Text(
+                    hasMetadataExtensions 
+                        ? 'Set search & metadata source order'
+                        : 'No extensions with metadata provider',
+                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: colorScheme.onSurfaceVariant,
+                    ),
+                  ),
+                ],
+              ),
+            ),
+            Icon(
+              Icons.chevron_right,
+              color: hasMetadataExtensions 
+                  ? colorScheme.onSurfaceVariant 
+                  : colorScheme.outline,
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _SearchProviderSelector extends ConsumerWidget {
+  const _SearchProviderSelector();
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final settings = ref.watch(settingsProvider);
+    final extState = ref.watch(extensionProvider);
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    // Get extensions with custom search
+    final searchProviders = extState.extensions
+        .where((e) => e.enabled && e.hasCustomSearch)
+        .toList();
+    
+    // Get current provider name
+    String currentProviderName = 'Default (Deezer/Spotify)';
+    if (settings.searchProvider != null && settings.searchProvider!.isNotEmpty) {
+      final ext = searchProviders.where((e) => e.id == settings.searchProvider).firstOrNull;
+      currentProviderName = ext?.displayName ?? settings.searchProvider!;
+    }
+    
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        InkWell(
+          onTap: searchProviders.isEmpty 
+              ? null 
+              : () => _showSearchProviderPicker(context, ref, settings, searchProviders),
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+            child: Row(
+              children: [
+                Icon(
+                  Icons.manage_search,
+                  color: searchProviders.isEmpty 
+                      ? colorScheme.outline 
+                      : colorScheme.onSurfaceVariant,
+                ),
+                const SizedBox(width: 16),
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        'Search Provider',
+                        style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                          color: searchProviders.isEmpty 
+                              ? colorScheme.outline 
+                              : null,
+                        ),
+                      ),
+                      const SizedBox(height: 2),
+                      Text(
+                        searchProviders.isEmpty 
+                            ? 'No extensions with custom search'
+                            : currentProviderName,
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+                Icon(
+                  Icons.chevron_right,
+                  color: searchProviders.isEmpty 
+                      ? colorScheme.outline 
+                      : colorScheme.onSurfaceVariant,
+                ),
+              ],
+            ),
+          ),
+        ),
+      ],
+    );
+  }
+
+  void _showSearchProviderPicker(
+    BuildContext context,
+    WidgetRef ref,
+    dynamic settings,
+    List<Extension> searchProviders,
+  ) {
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    showModalBottomSheet(
+      context: context,
+      backgroundColor: colorScheme.surfaceContainerHigh,
+      shape: const RoundedRectangleBorder(
+        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
+      ),
+      builder: (ctx) => SafeArea(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 24, 24, 8),
+              child: Text(
+                'Search Provider',
+                style: Theme.of(context).textTheme.titleLarge?.copyWith(
+                  fontWeight: FontWeight.bold,
+                ),
+              ),
+            ),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 0, 24, 16),
+              child: Text(
+                'Choose which service to use for searching tracks',
+                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                  color: colorScheme.onSurfaceVariant,
+                ),
+              ),
+            ),
+            // Default option
+            ListTile(
+              leading: Icon(Icons.music_note, color: colorScheme.primary),
+              title: const Text('Default (Deezer/Spotify)'),
+              subtitle: const Text('Use built-in search'),
+              trailing: (settings.searchProvider == null || settings.searchProvider!.isEmpty)
+                  ? Icon(Icons.check_circle, color: colorScheme.primary)
+                  : Icon(Icons.circle_outlined, color: colorScheme.outline),
+              onTap: () {
+                ref.read(settingsProvider.notifier).setSearchProvider(null);
+                Navigator.pop(ctx);
+              },
+            ),
+            // Extension options
+            ...searchProviders.map((ext) => ListTile(
+              leading: Icon(Icons.extension, color: colorScheme.secondary),
+              title: Text(ext.displayName),
+              subtitle: Text(ext.searchBehavior?.placeholder ?? 'Custom search'),
+              trailing: settings.searchProvider == ext.id
+                  ? Icon(Icons.check_circle, color: colorScheme.primary)
+                  : Icon(Icons.circle_outlined, color: colorScheme.outline),
+              onTap: () {
+                ref.read(settingsProvider.notifier).setSearchProvider(ext.id);
+                Navigator.pop(ctx);
+              },
+            )),
+            const SizedBox(height: 16),
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/screens/settings/log_screen.dart

@@ -125,59 +125,59 @@ class _LogScreenState extends State<LogScreen> {
     final logs = _filteredLogs;
 
     return PopScope(
-      canPop: true,
+      canPop: true, // Always allow back gesture
       child: Scaffold(
         body: CustomScrollView(
           controller: _scrollController,
           slivers: [
             // Collapsing App Bar with back button - same as other settings pages
             SliverAppBar(
-              expandedHeight: 120 + topPadding,
-              collapsedHeight: kToolbarHeight,
-              floating: false,
-              pinned: true,
-              backgroundColor: colorScheme.surface,
-              surfaceTintColor: Colors.transparent,
-              leading: IconButton(
-                icon: const Icon(Icons.arrow_back),
-                onPressed: () => Navigator.pop(context),
+            expandedHeight: 120 + topPadding,
+            collapsedHeight: kToolbarHeight,
+            floating: false,
+            pinned: true,
+            backgroundColor: colorScheme.surface,
+            surfaceTintColor: Colors.transparent,
+            leading: IconButton(
+              icon: const Icon(Icons.arrow_back),
+              onPressed: () => Navigator.pop(context),
+            ),
+            actions: [
+              IconButton(
+                icon: Icon(_autoScroll ? Icons.vertical_align_bottom : Icons.vertical_align_center),
+                tooltip: _autoScroll ? 'Auto-scroll ON' : 'Auto-scroll OFF',
+                onPressed: () => setState(() => _autoScroll = !_autoScroll),
               ),
-              actions: [
-                IconButton(
-                  icon: Icon(_autoScroll ? Icons.vertical_align_bottom : Icons.vertical_align_center),
-                  tooltip: _autoScroll ? 'Auto-scroll ON' : 'Auto-scroll OFF',
-                  onPressed: () => setState(() => _autoScroll = !_autoScroll),
-                ),
-                IconButton(
-                  icon: const Icon(Icons.copy),
-                  tooltip: 'Copy logs',
-                  onPressed: _copyLogs,
-                ),
-                PopupMenuButton<String>(
-                  icon: const Icon(Icons.more_vert),
-                  onSelected: (value) {
-                    switch (value) {
-                      case 'share':
-                        _shareLogs();
-                        break;
-                      case 'clear':
-                        _clearLogs();
-                        break;
-                    }
-                  },
-                  itemBuilder: (context) => [
-                    const PopupMenuItem(
-                      value: 'share',
-                      child: ListTile(
-                        leading: Icon(Icons.share),
-                        title: Text('Share logs'),
-                        contentPadding: EdgeInsets.zero,
-                      ),
+              IconButton(
+                icon: const Icon(Icons.copy),
+                tooltip: 'Copy logs',
+                onPressed: _copyLogs,
+              ),
+              PopupMenuButton<String>(
+                icon: const Icon(Icons.more_vert),
+                onSelected: (value) {
+                  switch (value) {
+                    case 'share':
+                      _shareLogs();
+                      break;
+                    case 'clear':
+                      _clearLogs();
+                      break;
+                  }
+                },
+                itemBuilder: (context) => [
+                  const PopupMenuItem(
+                    value: 'share',
+                    child: ListTile(
+                      leading: Icon(Icons.share),
+                      title: Text('Share logs'),
+                      contentPadding: EdgeInsets.zero,
                     ),
-                    const PopupMenuItem(
-                      value: 'clear',
-                      child: ListTile(
-                        leading: Icon(Icons.delete_outline),
+                  ),
+                  const PopupMenuItem(
+                    value: 'clear',
+                    child: ListTile(
+                      leading: Icon(Icons.delete_outline),
                         title: Text('Clear logs'),
                         contentPadding: EdgeInsets.zero,
                       ),

lib/screens/settings/metadata_provider_priority_page.dart

@@ -0,0 +1,366 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+
+class MetadataProviderPriorityPage extends ConsumerStatefulWidget {
+  const MetadataProviderPriorityPage({super.key});
+
+  @override
+  ConsumerState<MetadataProviderPriorityPage> createState() => _MetadataProviderPriorityPageState();
+}
+
+class _MetadataProviderPriorityPageState extends ConsumerState<MetadataProviderPriorityPage> {
+  late List<String> _providers;
+  bool _hasChanges = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _loadProviders();
+  }
+
+  void _loadProviders() {
+    final extState = ref.read(extensionProvider);
+    final allProviders = ref.read(extensionProvider.notifier).getAllMetadataProviders();
+    
+    // Use saved priority if available, otherwise use default order
+    if (extState.metadataProviderPriority.isNotEmpty) {
+      _providers = List.from(extState.metadataProviderPriority);
+      // Add any new providers not in saved priority
+      for (final provider in allProviders) {
+        if (!_providers.contains(provider)) {
+          _providers.add(provider);
+        }
+      }
+      // Remove providers that no longer exist
+      _providers.removeWhere((p) => !allProviders.contains(p));
+    } else {
+      _providers = allProviders;
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final topPadding = MediaQuery.of(context).padding.top;
+
+    return PopScope(
+      canPop: !_hasChanges,
+      onPopInvokedWithResult: (didPop, result) async {
+        if (didPop) return;
+        final shouldPop = await _confirmDiscard(context);
+        if (shouldPop && context.mounted) {
+          Navigator.pop(context);
+        }
+      },
+      child: Scaffold(
+        body: CustomScrollView(
+          slivers: [
+            // App Bar
+            SliverAppBar(
+              expandedHeight: 120 + topPadding,
+              collapsedHeight: kToolbarHeight,
+              floating: false,
+              pinned: true,
+              backgroundColor: colorScheme.surface,
+              surfaceTintColor: Colors.transparent,
+              leading: IconButton(
+                icon: const Icon(Icons.arrow_back),
+                onPressed: () async {
+                  if (_hasChanges) {
+                    final shouldPop = await _confirmDiscard(context);
+                    if (shouldPop && context.mounted) {
+                      Navigator.pop(context);
+                    }
+                  } else {
+                    Navigator.pop(context);
+                  }
+                },
+              ),
+              actions: [
+                if (_hasChanges)
+                  TextButton(
+                    onPressed: _saveChanges,
+                    child: const Text('Save'),
+                  ),
+              ],
+              flexibleSpace: LayoutBuilder(
+                builder: (context, constraints) {
+                  final maxHeight = 120 + topPadding;
+                  final minHeight = kToolbarHeight + topPadding;
+                  final expandRatio = ((constraints.maxHeight - minHeight) /
+                          (maxHeight - minHeight))
+                      .clamp(0.0, 1.0);
+                  final leftPadding = 56 - (32 * expandRatio);
+                  return FlexibleSpaceBar(
+                    expandedTitleScale: 1.0,
+                    titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+                    title: Text(
+                      'Metadata Priority',
+                      style: TextStyle(
+                        fontSize: 20 + (8 * expandRatio),
+                        fontWeight: FontWeight.bold,
+                        color: colorScheme.onSurface,
+                      ),
+                    ),
+                  );
+                },
+              ),
+            ),
+
+            // Description
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Text(
+                  'Drag to reorder metadata providers. The app will try providers '
+                  'from top to bottom when searching for tracks and fetching metadata.',
+                  style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                    color: colorScheme.onSurfaceVariant,
+                  ),
+                ),
+              ),
+            ),
+
+            // Provider list
+            SliverPadding(
+              padding: const EdgeInsets.symmetric(horizontal: 16),
+              sliver: SliverReorderableList(
+                itemCount: _providers.length,
+                itemBuilder: (context, index) {
+                  final provider = _providers[index];
+                  return _MetadataProviderItem(
+                    key: ValueKey(provider),
+                    provider: provider,
+                    index: index,
+                    isFirst: index == 0,
+                    isLast: index == _providers.length - 1,
+                  );
+                },
+                onReorder: (oldIndex, newIndex) {
+                  setState(() {
+                    if (newIndex > oldIndex) {
+                      newIndex -= 1;
+                    }
+                    final item = _providers.removeAt(oldIndex);
+                    _providers.insert(newIndex, item);
+                    _hasChanges = true;
+                  });
+                },
+              ),
+            ),
+
+            // Info section
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Container(
+                  padding: const EdgeInsets.all(12),
+                  decoration: BoxDecoration(
+                    color: colorScheme.tertiaryContainer.withValues(alpha: 0.3),
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                  child: Row(
+                    children: [
+                      Icon(Icons.info_outline, size: 20, color: colorScheme.tertiary),
+                      const SizedBox(width: 12),
+                      Expanded(
+                        child: Text(
+                          'Deezer has no rate limits and is recommended as primary. '
+                          'Spotify may rate limit after many requests.',
+                          style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                            color: colorScheme.onTertiaryContainer,
+                          ),
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+            ),
+
+            const SliverToBoxAdapter(child: SizedBox(height: 32)),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Future<bool> _confirmDiscard(BuildContext context) async {
+    final result = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Discard Changes?'),
+        content: const Text('You have unsaved changes. Do you want to discard them?'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context, false),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.pop(context, true),
+            child: const Text('Discard'),
+          ),
+        ],
+      ),
+    );
+    return result ?? false;
+  }
+
+  Future<void> _saveChanges() async {
+    await ref.read(extensionProvider.notifier).setMetadataProviderPriority(_providers);
+    setState(() {
+      _hasChanges = false;
+    });
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('Metadata provider priority saved')),
+      );
+    }
+  }
+}
+
+class _MetadataProviderItem extends StatelessWidget {
+  final String provider;
+  final int index;
+  final bool isFirst;
+  final bool isLast;
+
+  const _MetadataProviderItem({
+    super.key,
+    required this.provider,
+    required this.index,
+    required this.isFirst,
+    required this.isLast,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+
+    final backgroundColor = isDark
+        ? Color.alphaBlend(
+            Colors.white.withValues(alpha: 0.05),
+            colorScheme.surface,
+          )
+        : colorScheme.surfaceContainerHigh;
+
+    final info = _getProviderInfo(provider);
+
+    return Padding(
+      padding: const EdgeInsets.only(bottom: 8),
+      child: Material(
+        color: backgroundColor,
+        borderRadius: BorderRadius.circular(16),
+        child: ReorderableDragStartListener(
+          index: index,
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+            child: Row(
+              children: [
+                // Priority number
+                Container(
+                  width: 28,
+                  height: 28,
+                  decoration: BoxDecoration(
+                    color: isFirst
+                        ? colorScheme.primaryContainer
+                        : colorScheme.surfaceContainerHighest,
+                    shape: BoxShape.circle,
+                  ),
+                  child: Center(
+                    child: Text(
+                      '${index + 1}',
+                      style: TextStyle(
+                        fontWeight: FontWeight.bold,
+                        color: isFirst
+                            ? colorScheme.onPrimaryContainer
+                            : colorScheme.onSurfaceVariant,
+                      ),
+                    ),
+                  ),
+                ),
+                const SizedBox(width: 16),
+                // Provider icon
+                Icon(
+                  info.icon,
+                  color: info.isBuiltIn
+                      ? colorScheme.primary
+                      : colorScheme.secondary,
+                ),
+                const SizedBox(width: 12),
+                // Provider name
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        info.name,
+                        style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                          fontWeight: FontWeight.w500,
+                        ),
+                      ),
+                      Text(
+                        info.description,
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+                // Drag handle
+                Icon(
+                  Icons.drag_handle,
+                  color: colorScheme.onSurfaceVariant,
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  _MetadataProviderInfo _getProviderInfo(String provider) {
+    switch (provider) {
+      case 'deezer':
+        return _MetadataProviderInfo(
+          name: 'Deezer',
+          icon: Icons.album,
+          description: 'No rate limits',
+          isBuiltIn: true,
+        );
+      case 'spotify':
+        return _MetadataProviderInfo(
+          name: 'Spotify',
+          icon: Icons.music_note,
+          description: 'May rate limit',
+          isBuiltIn: true,
+        );
+      default:
+        // Extension provider
+        return _MetadataProviderInfo(
+          name: provider,
+          icon: Icons.extension,
+          description: 'Extension',
+          isBuiltIn: false,
+        );
+    }
+  }
+}
+
+class _MetadataProviderInfo {
+  final String name;
+  final IconData icon;
+  final String description;
+  final bool isBuiltIn;
+
+  _MetadataProviderInfo({
+    required this.name,
+    required this.icon,
+    required this.description,
+    required this.isBuiltIn,
+  });
+}

lib/screens/settings/options_settings_page.dart

@@ -3,6 +3,7 @@ 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/providers/extension_provider.dart';
 import 'package:spotiflac_android/widgets/settings_group.dart';
 
 class OptionsSettingsPage extends ConsumerWidget {
@@ -11,53 +12,55 @@ class OptionsSettingsPage extends ConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final settings = ref.watch(settingsProvider);
+    final extensionState = ref.watch(extensionProvider);
+    final hasExtensions = extensionState.extensions.isNotEmpty;
     final colorScheme = Theme.of(context).colorScheme;
     final topPadding = MediaQuery.of(context).padding.top;
 
     return PopScope(
-      canPop: true,
+      canPop: true, // Always allow back gesture
       child: Scaffold(
         body: CustomScrollView(
           slivers: [
             // Collapsing App Bar with back button
             SliverAppBar(
-              expandedHeight: 120 + topPadding,
-              collapsedHeight: kToolbarHeight,
-              floating: false,
-              pinned: true,
-              backgroundColor: colorScheme.surface,
-              surfaceTintColor: Colors.transparent,
-              leading: IconButton(
-                icon: const Icon(Icons.arrow_back),
-                onPressed: () => Navigator.pop(context),
-              ),
-              flexibleSpace: LayoutBuilder(
-                builder: (context, constraints) {
-                  final maxHeight = 120 + topPadding;
-                  final minHeight = kToolbarHeight + topPadding;
-                  final expandRatio =
-                      ((constraints.maxHeight - minHeight) /
-                              (maxHeight - minHeight))
-                          .clamp(0.0, 1.0);
-                  final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
-                  return FlexibleSpaceBar(
-                    expandedTitleScale: 1.0,
-                    titlePadding: EdgeInsets.only(
-                      left: leftPadding,
-                      bottom: 16,
-                    ),
-                    title: Text(
-                      'Options',
-                      style: TextStyle(
-                        fontSize: 20 + (8 * expandRatio), // 20 -> 28
-                        fontWeight: FontWeight.bold,
-                        color: colorScheme.onSurface,
-                      ),
-                    ),
-                  );
-                },
-              ),
+            expandedHeight: 120 + topPadding,
+            collapsedHeight: kToolbarHeight,
+            floating: false,
+            pinned: true,
+            backgroundColor: colorScheme.surface,
+            surfaceTintColor: Colors.transparent,
+            leading: IconButton(
+              icon: const Icon(Icons.arrow_back),
+              onPressed: () => Navigator.pop(context),
             ),
+            flexibleSpace: LayoutBuilder(
+              builder: (context, constraints) {
+                final maxHeight = 120 + topPadding;
+                final minHeight = kToolbarHeight + topPadding;
+                final expandRatio =
+                    ((constraints.maxHeight - minHeight) /
+                            (maxHeight - minHeight))
+                        .clamp(0.0, 1.0);
+                final leftPadding = 56 - (32 * expandRatio); // 56 -> 24
+                return FlexibleSpaceBar(
+                  expandedTitleScale: 1.0,
+                  titlePadding: EdgeInsets.only(
+                    left: leftPadding,
+                    bottom: 16,
+                  ),
+                  title: Text(
+                    'Options',
+                    style: TextStyle(
+                      fontSize: 20 + (8 * expandRatio), // 20 -> 28
+                      fontWeight: FontWeight.bold,
+                      color: colorScheme.onSurface,
+                    ),
+                  ),
+                );
+              },
+            ),
+          ),
 
             // Search Source section
             const SliverToBoxAdapter(
@@ -73,38 +76,50 @@ class OptionsSettingsPage extends ConsumerWidget {
                         .setMetadataSource(v),
                   ),
                   if (settings.metadataSource == 'spotify') ...[
-                    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);
-                        if (v && settings.spotifyClientId.isEmpty) {
-                          _showSpotifyCredentialsDialog(context, ref, settings);
-                        }
-                      },
-                      showDivider: true,
-                    ),
+                    // Info card about Spotify credentials requirement
+                    if (settings.spotifyClientId.isEmpty)
+                      Padding(
+                        padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
+                        child: Card(
+                          color: Theme.of(context).colorScheme.errorContainer,
+                          child: Padding(
+                            padding: const EdgeInsets.all(12),
+                            child: Row(
+                              children: [
+                                Icon(
+                                  Icons.warning_amber_rounded,
+                                  color: Theme.of(context).colorScheme.onErrorContainer,
+                                ),
+                                const SizedBox(width: 12),
+                                Expanded(
+                                  child: Text(
+                                    'Spotify requires your own API credentials. Get them free from developer.spotify.com',
+                                    style: TextStyle(
+                                      color: Theme.of(context).colorScheme.onErrorContainer,
+                                      fontSize: 12,
+                                    ),
+                                  ),
+                                ),
+                              ],
+                            ),
+                          ),
+                        ),
+                      ),
                     SettingsItem(
                       icon: Icons.key,
-                      title: 'Set Credentials',
+                      title: 'Spotify Credentials',
                       subtitle: settings.spotifyClientId.isNotEmpty
                           ? 'Client ID: ${settings.spotifyClientId.length > 8 ? '${settings.spotifyClientId.substring(0, 8)}...' : settings.spotifyClientId}'
-                          : 'Not configured',
+                          : 'Required - tap to configure',
                       onTap: () =>
                           _showSpotifyCredentialsDialog(context, ref, settings),
                       trailing: Icon(
                         settings.spotifyClientId.isNotEmpty
-                            ? Icons.edit
-                            : Icons.add,
+                            ? Icons.check_circle
+                            : Icons.error_outline,
                         color: settings.spotifyClientId.isNotEmpty
-                            ? Theme.of(context).colorScheme.onSurfaceVariant
-                            : Theme.of(context).colorScheme.primary,
+                            ? Theme.of(context).colorScheme.primary
+                            : Theme.of(context).colorScheme.error,
                         size: 20,
                       ),
                       showDivider: false,
@@ -129,6 +144,18 @@ class OptionsSettingsPage extends ConsumerWidget {
                     onChanged: (v) =>
                         ref.read(settingsProvider.notifier).setAutoFallback(v),
                   ),
+                  if (hasExtensions)
+                    SettingsSwitchItem(
+                      icon: Icons.extension,
+                      title: 'Use Extension Providers',
+                      subtitle: settings.useExtensionProviders
+                          ? 'Extensions will be tried first'
+                          : 'Using built-in providers only',
+                      value: settings.useExtensionProviders,
+                      onChanged: (v) => ref
+                          .read(settingsProvider.notifier)
+                          .setUseExtensionProviders(v),
+                    ),
                   SettingsSwitchItem(
                     icon: Icons.lyrics,
                     title: 'Embed Lyrics',
@@ -175,6 +202,15 @@ class OptionsSettingsPage extends ConsumerWidget {
             SliverToBoxAdapter(
               child: SettingsGroup(
                 children: [
+                  SettingsSwitchItem(
+                    icon: Icons.store,
+                    title: 'Extension Store',
+                    subtitle: 'Show Store tab in navigation',
+                    value: settings.showExtensionStore,
+                    onChanged: (v) => ref
+                        .read(settingsProvider.notifier)
+                        .setShowExtensionStore(v),
+                  ),
                   SettingsSwitchItem(
                     icon: Icons.system_update,
                     title: 'Check for Updates',
@@ -345,11 +381,15 @@ class OptionsSettingsPage extends ConsumerWidget {
                       ),
                       border: OutlineInputBorder(
                         borderRadius: BorderRadius.circular(16),
-                        borderSide: BorderSide.none,
+                        borderSide: BorderSide(
+                          color: colorScheme.outlineVariant,
+                        ),
                       ),
                       enabledBorder: OutlineInputBorder(
                         borderRadius: BorderRadius.circular(16),
-                        borderSide: BorderSide.none,
+                        borderSide: BorderSide(
+                          color: colorScheme.outlineVariant,
+                        ),
                       ),
                       focusedBorder: OutlineInputBorder(
                         borderRadius: BorderRadius.circular(16),
@@ -380,11 +420,15 @@ class OptionsSettingsPage extends ConsumerWidget {
                       ),
                       border: OutlineInputBorder(
                         borderRadius: BorderRadius.circular(16),
-                        borderSide: BorderSide.none,
+                        borderSide: BorderSide(
+                          color: colorScheme.outlineVariant,
+                        ),
                       ),
                       enabledBorder: OutlineInputBorder(
                         borderRadius: BorderRadius.circular(16),
-                        borderSide: BorderSide.none,
+                        borderSide: BorderSide(
+                          color: colorScheme.outlineVariant,
+                        ),
                       ),
                       focusedBorder: OutlineInputBorder(
                         borderRadius: BorderRadius.circular(16),
@@ -745,7 +789,7 @@ class _ChannelChip extends StatelessWidget {
   }
 }
 
-class _MetadataSourceSelector extends StatelessWidget {
+class _MetadataSourceSelector extends ConsumerWidget {
   final String currentSource;
   final ValueChanged<String> onChanged;
   const _MetadataSourceSelector({
@@ -754,8 +798,25 @@ class _MetadataSourceSelector extends StatelessWidget {
   });
 
   @override
-  Widget build(BuildContext context) {
+  Widget build(BuildContext context, WidgetRef ref) {
     final colorScheme = Theme.of(context).colorScheme;
+    final settings = ref.watch(settingsProvider);
+    final extState = ref.watch(extensionProvider);
+    
+    // Check if extension search provider is active AND enabled
+    Extension? activeExtension;
+    if (settings.searchProvider != null && settings.searchProvider!.isNotEmpty) {
+      activeExtension = extState.extensions
+          .where((e) => e.id == settings.searchProvider && e.enabled)
+          .firstOrNull;
+    }
+    final hasExtensionSearch = activeExtension != null;
+    
+    String? extensionName;
+    if (hasExtensionSearch) {
+      extensionName = activeExtension.displayName;
+    }
+    
     return Padding(
       padding: const EdgeInsets.all(16),
       child: Column(
@@ -769,9 +830,13 @@ class _MetadataSourceSelector extends StatelessWidget {
           ),
           const SizedBox(height: 4),
           Text(
-            'Service used when searching by track name.',
+            hasExtensionSearch
+                ? 'Using extension: $extensionName'
+                : 'Service used when searching by track name.',
             style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-              color: colorScheme.onSurfaceVariant,
+              color: hasExtensionSearch 
+                  ? colorScheme.primary 
+                  : colorScheme.onSurfaceVariant,
             ),
           ),
           const SizedBox(height: 16),
@@ -780,18 +845,53 @@ class _MetadataSourceSelector extends StatelessWidget {
               _SourceChip(
                 icon: Icons.graphic_eq,
                 label: 'Deezer',
-                isSelected: currentSource == 'deezer',
-                onTap: () => onChanged('deezer'),
+                // 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);
+                  }
+                  onChanged('deezer');
+                },
               ),
               const SizedBox(width: 12),
               _SourceChip(
                 icon: Icons.music_note,
                 label: 'Spotify',
-                isSelected: currentSource == 'spotify',
-                onTap: () => onChanged('spotify'),
+                // Not selected if extension is active
+                isSelected: currentSource == 'spotify' && !hasExtensionSearch,
+                onTap: () {
+                  // If extension was active, reset it to default
+                  if (hasExtensionSearch) {
+                    ref.read(settingsProvider.notifier).setSearchProvider(null);
+                  }
+                  onChanged('spotify');
+                },
               ),
             ],
           ),
+          if (hasExtensionSearch) ...[
+            const SizedBox(height: 12),
+            Row(
+              children: [
+                Icon(
+                  Icons.info_outline,
+                  size: 16,
+                  color: colorScheme.onSurfaceVariant,
+                ),
+                const SizedBox(width: 8),
+                Expanded(
+                  child: Text(
+                    'Tap Deezer or Spotify to switch back from extension',
+                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                      color: colorScheme.onSurfaceVariant,
+                    ),
+                  ),
+                ),
+              ],
+            ),
+          ],
         ],
       ),
     );
@@ -802,13 +902,17 @@ class _SourceChip extends StatelessWidget {
   final IconData icon;
   final String label;
   final bool isSelected;
-  final VoidCallback onTap;
+  final VoidCallback? onTap;
+  final String? badge;
+  final Color? badgeColor;
 
   const _SourceChip({
     required this.icon,
     required this.label,
     required this.isSelected,
-    required this.onTap,
+    this.onTap,
+    this.badge,
+    this.badgeColor,
   });
 
   @override
@@ -854,6 +958,24 @@ class _SourceChip extends StatelessWidget {
                         : colorScheme.onSurfaceVariant,
                   ),
                 ),
+                if (badge != null) ...[
+                  const SizedBox(height: 4),
+                  Container(
+                    padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
+                    decoration: BoxDecoration(
+                      color: (badgeColor ?? colorScheme.tertiary).withValues(alpha: 0.2),
+                      borderRadius: BorderRadius.circular(4),
+                    ),
+                    child: Text(
+                      badge!,
+                      style: TextStyle(
+                        fontSize: 9,
+                        fontWeight: FontWeight.w500,
+                        color: badgeColor ?? colorScheme.tertiary,
+                      ),
+                    ),
+                  ),
+                ],
               ],
             ),
           ),

lib/screens/settings/provider_priority_page.dart

@@ -0,0 +1,369 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+
+class ProviderPriorityPage extends ConsumerStatefulWidget {
+  const ProviderPriorityPage({super.key});
+
+  @override
+  ConsumerState<ProviderPriorityPage> createState() => _ProviderPriorityPageState();
+}
+
+class _ProviderPriorityPageState extends ConsumerState<ProviderPriorityPage> {
+  late List<String> _providers;
+  bool _hasChanges = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _loadProviders();
+  }
+
+  void _loadProviders() {
+    final extState = ref.read(extensionProvider);
+    final allProviders = ref.read(extensionProvider.notifier).getAllDownloadProviders();
+    
+    // Use saved priority if available, otherwise use default order
+    if (extState.providerPriority.isNotEmpty) {
+      // Start with saved priority
+      _providers = List.from(extState.providerPriority);
+      // Add any new providers not in saved priority
+      for (final provider in allProviders) {
+        if (!_providers.contains(provider)) {
+          _providers.add(provider);
+        }
+      }
+      // Remove providers that no longer exist
+      _providers.removeWhere((p) => !allProviders.contains(p));
+    } else {
+      _providers = allProviders;
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final topPadding = MediaQuery.of(context).padding.top;
+
+    return PopScope(
+      canPop: !_hasChanges,
+      onPopInvokedWithResult: (didPop, result) async {
+        if (didPop) return;
+        final shouldPop = await _confirmDiscard(context);
+        if (shouldPop && context.mounted) {
+          Navigator.pop(context);
+        }
+      },
+      child: Scaffold(
+        body: CustomScrollView(
+          slivers: [
+            // App Bar
+            SliverAppBar(
+              expandedHeight: 120 + topPadding,
+              collapsedHeight: kToolbarHeight,
+              floating: false,
+              pinned: true,
+              backgroundColor: colorScheme.surface,
+              surfaceTintColor: Colors.transparent,
+              leading: IconButton(
+                icon: const Icon(Icons.arrow_back),
+                onPressed: () async {
+                  if (_hasChanges) {
+                    final shouldPop = await _confirmDiscard(context);
+                    if (shouldPop && context.mounted) {
+                      Navigator.pop(context);
+                    }
+                  } else {
+                    Navigator.pop(context);
+                  }
+                },
+              ),
+              actions: [
+                if (_hasChanges)
+                  TextButton(
+                    onPressed: _saveChanges,
+                    child: const Text('Save'),
+                  ),
+              ],
+              flexibleSpace: LayoutBuilder(
+                builder: (context, constraints) {
+                  final maxHeight = 120 + topPadding;
+                  final minHeight = kToolbarHeight + topPadding;
+                  final expandRatio = ((constraints.maxHeight - minHeight) /
+                          (maxHeight - minHeight))
+                      .clamp(0.0, 1.0);
+                  final leftPadding = 56 - (32 * expandRatio);
+                  return FlexibleSpaceBar(
+                    expandedTitleScale: 1.0,
+                    titlePadding: EdgeInsets.only(left: leftPadding, bottom: 16),
+                    title: Text(
+                      'Provider Priority',
+                      style: TextStyle(
+                        fontSize: 20 + (8 * expandRatio),
+                        fontWeight: FontWeight.bold,
+                        color: colorScheme.onSurface,
+                      ),
+                    ),
+                  );
+                },
+              ),
+            ),
+
+            // Description
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Text(
+                  'Drag to reorder download providers. The app will try providers '
+                  'from top to bottom when downloading tracks.',
+                  style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                    color: colorScheme.onSurfaceVariant,
+                  ),
+                ),
+              ),
+            ),
+
+            // Provider list
+            SliverPadding(
+              padding: const EdgeInsets.symmetric(horizontal: 16),
+              sliver: SliverReorderableList(
+                itemCount: _providers.length,
+                itemBuilder: (context, index) {
+                  final provider = _providers[index];
+                  return _ProviderItem(
+                    key: ValueKey(provider),
+                    provider: provider,
+                    index: index,
+                    isFirst: index == 0,
+                    isLast: index == _providers.length - 1,
+                  );
+                },
+                onReorder: (oldIndex, newIndex) {
+                  setState(() {
+                    if (newIndex > oldIndex) {
+                      newIndex -= 1;
+                    }
+                    final item = _providers.removeAt(oldIndex);
+                    _providers.insert(newIndex, item);
+                    _hasChanges = true;
+                  });
+                },
+              ),
+            ),
+
+            // Info section
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Container(
+                  padding: const EdgeInsets.all(12),
+                  decoration: BoxDecoration(
+                    color: colorScheme.tertiaryContainer.withValues(alpha: 0.3),
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                  child: Row(
+                    children: [
+                      Icon(Icons.info_outline, size: 20, color: colorScheme.tertiary),
+                      const SizedBox(width: 12),
+                      Expanded(
+                        child: Text(
+                          'If a track is not available on the first provider, '
+                          'the app will automatically try the next one.',
+                          style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                            color: colorScheme.onTertiaryContainer,
+                          ),
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+            ),
+
+            const SliverToBoxAdapter(child: SizedBox(height: 32)),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Future<bool> _confirmDiscard(BuildContext context) async {
+    final result = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Discard Changes?'),
+        content: const Text('You have unsaved changes. Do you want to discard them?'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context, false),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.pop(context, true),
+            child: const Text('Discard'),
+          ),
+        ],
+      ),
+    );
+    return result ?? false;
+  }
+
+  Future<void> _saveChanges() async {
+    await ref.read(extensionProvider.notifier).setProviderPriority(_providers);
+    setState(() {
+      _hasChanges = false;
+    });
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('Provider priority saved')),
+      );
+    }
+  }
+}
+
+class _ProviderItem extends StatelessWidget {
+  final String provider;
+  final int index;
+  final bool isFirst;
+  final bool isLast;
+
+  const _ProviderItem({
+    super.key,
+    required this.provider,
+    required this.index,
+    required this.isFirst,
+    required this.isLast,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+
+    final backgroundColor = isDark
+        ? Color.alphaBlend(
+            Colors.white.withValues(alpha: 0.05),
+            colorScheme.surface,
+          )
+        : colorScheme.surfaceContainerHigh;
+
+    // Get provider info
+    final info = _getProviderInfo(provider);
+
+    return Padding(
+      padding: const EdgeInsets.only(bottom: 8),
+      child: Material(
+        color: backgroundColor,
+        borderRadius: BorderRadius.circular(16),
+        child: ReorderableDragStartListener(
+          index: index,
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+            child: Row(
+              children: [
+                // Priority number
+                Container(
+                  width: 28,
+                  height: 28,
+                  decoration: BoxDecoration(
+                    color: isFirst
+                        ? colorScheme.primaryContainer
+                        : colorScheme.surfaceContainerHighest,
+                    shape: BoxShape.circle,
+                  ),
+                  child: Center(
+                    child: Text(
+                      '${index + 1}',
+                      style: TextStyle(
+                        fontWeight: FontWeight.bold,
+                        color: isFirst
+                            ? colorScheme.onPrimaryContainer
+                            : colorScheme.onSurfaceVariant,
+                      ),
+                    ),
+                  ),
+                ),
+                const SizedBox(width: 16),
+                // Provider icon
+                Icon(
+                  info.icon,
+                  color: info.isBuiltIn
+                      ? colorScheme.primary
+                      : colorScheme.secondary,
+                ),
+                const SizedBox(width: 12),
+                // Provider name
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        info.name,
+                        style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                          fontWeight: FontWeight.w500,
+                        ),
+                      ),
+                      Text(
+                        info.isBuiltIn ? 'Built-in' : 'Extension',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+                // Drag handle
+                Icon(
+                  Icons.drag_handle,
+                  color: colorScheme.onSurfaceVariant,
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  _ProviderInfo _getProviderInfo(String provider) {
+    switch (provider) {
+      case 'tidal':
+        return _ProviderInfo(
+          name: 'Tidal',
+          icon: Icons.music_note,
+          isBuiltIn: true,
+        );
+      case 'qobuz':
+        return _ProviderInfo(
+          name: 'Qobuz',
+          icon: Icons.album,
+          isBuiltIn: true,
+        );
+      case 'amazon':
+        return _ProviderInfo(
+          name: 'Amazon Music',
+          icon: Icons.shopping_bag,
+          isBuiltIn: true,
+        );
+      default:
+        // Extension provider
+        return _ProviderInfo(
+          name: provider,
+          icon: Icons.extension,
+          isBuiltIn: false,
+        );
+    }
+  }
+}
+
+class _ProviderInfo {
+  final String name;
+  final IconData icon;
+  final bool isBuiltIn;
+
+  _ProviderInfo({
+    required this.name,
+    required this.icon,
+    required this.isBuiltIn,
+  });
+}

lib/screens/settings/settings_tab.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:spotiflac_android/constants/app_info.dart';
 import 'package:spotiflac_android/screens/settings/appearance_settings_page.dart';
 import 'package:spotiflac_android/screens/settings/download_settings_page.dart';
+import 'package:spotiflac_android/screens/settings/extensions_page.dart';
 import 'package:spotiflac_android/screens/settings/options_settings_page.dart';
 import 'package:spotiflac_android/screens/settings/about_page.dart';
 import 'package:spotiflac_android/screens/settings/log_screen.dart';
@@ -31,8 +32,11 @@ class SettingsTab extends ConsumerWidget {
             builder: (context, constraints) {
               final maxHeight = 120 + topPadding;
               final minHeight = kToolbarHeight + topPadding;
-              final expandRatio = ((constraints.maxHeight - minHeight) / (maxHeight - minHeight)).clamp(0.0, 1.0);
-              
+              final expandRatio =
+                  ((constraints.maxHeight - minHeight) /
+                          (maxHeight - minHeight))
+                      .clamp(0.0, 1.0);
+
               return FlexibleSpaceBar(
                 expandedTitleScale: 1.0,
                 titlePadding: const EdgeInsets.only(left: 24, bottom: 16),
@@ -58,7 +62,8 @@ class SettingsTab extends ConsumerWidget {
                 icon: Icons.palette_outlined,
                 title: 'Appearance',
                 subtitle: 'Theme, colors, display',
-                onTap: () => _navigateTo(context, const AppearanceSettingsPage()),
+                onTap: () =>
+                    _navigateTo(context, const AppearanceSettingsPage()),
               ),
               SettingsItem(
                 icon: Icons.download_outlined,
@@ -71,6 +76,12 @@ class SettingsTab extends ConsumerWidget {
                 title: 'Options',
                 subtitle: 'Fallback, lyrics, cover art, updates',
                 onTap: () => _navigateTo(context, const OptionsSettingsPage()),
+              ),
+              SettingsItem(
+                icon: Icons.extension_outlined,
+                title: 'Extensions',
+                subtitle: 'Manage download providers',
+                onTap: () => _navigateTo(context, const ExtensionsPage()),
                 showDivider: false,
               ),
             ],
@@ -97,7 +108,7 @@ class SettingsTab extends ConsumerWidget {
             ],
           ),
         ),
-        
+
         // Fill remaining space
         const SliverFillRemaining(hasScrollBody: false, child: SizedBox()),
       ],
@@ -105,6 +116,27 @@ class SettingsTab extends ConsumerWidget {
   }
 
   void _navigateTo(BuildContext context, Widget page) {
-    Navigator.of(context).push(MaterialPageRoute(builder: (_) => page));
+    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;
+          var tween = Tween(begin: begin, end: end).chain(
+            CurveTween(curve: curve),
+          );
+          return SlideTransition(
+            position: animation.drive(tween),
+            child: child,
+          );
+        },
+        transitionDuration: const Duration(milliseconds: 300),
+        reverseTransitionDuration: const Duration(milliseconds: 250),
+      ),
+    );
   }
 }

lib/screens/setup_screen.dart

@@ -444,11 +444,10 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
           _clientIdController.text.trim(),
           _clientSecretController.text.trim(),
         );
-        ref.read(settingsProvider.notifier).setUseCustomSpotifyCredentials(true);
-        // Set search source to Spotify when using custom credentials
+        // Set search source to Spotify when credentials are provided
         ref.read(settingsProvider.notifier).setMetadataSource('spotify');
       } else {
-        // Use Deezer as default search source
+        // Use Deezer as default search source (free, no credentials required)
         ref.read(settingsProvider.notifier).setMetadataSource('deezer');
       }
       

lib/screens/store/extension_details_screen.dart

@@ -0,0 +1,751 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:spotiflac_android/providers/store_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+
+class ExtensionDetailsScreen extends ConsumerStatefulWidget {
+  final StoreExtension extension;
+
+  const ExtensionDetailsScreen({super.key, required this.extension});
+
+  @override
+  ConsumerState<ExtensionDetailsScreen> createState() =>
+      _ExtensionDetailsScreenState();
+}
+
+class _ExtensionDetailsScreenState
+    extends ConsumerState<ExtensionDetailsScreen> {
+
+  @override
+  Widget build(BuildContext context) {
+    // Watch store provider to get latest state of this extension (e.g. if updated/installed)
+    final storeState = ref.watch(storeProvider);
+
+    // Find our extension in the store state to get the latest status
+    // If not found in current store state (rare), fallback to widget.extension
+    final liveExtension =
+        storeState.extensions
+            .where((e) => e.id == widget.extension.id)
+            .firstOrNull ??
+        widget.extension;
+
+    final isDownloading = storeState.downloadingId == liveExtension.id;
+    final colorScheme = Theme.of(context).colorScheme;
+
+    return Scaffold(
+      body: CustomScrollView(
+        slivers: [
+          _buildAppBar(context, liveExtension, colorScheme),
+          _buildInfoCard(context, liveExtension, colorScheme, isDownloading),
+          _buildSectionHeader(
+            context,
+            'About',
+            Icons.info_outline,
+            colorScheme,
+          ),
+          _buildDescription(context, liveExtension, colorScheme),
+
+          if (liveExtension.tags.isNotEmpty) ...[
+            _buildSectionHeader(context, 'Tags', Icons.tag, colorScheme),
+            _buildTags(context, liveExtension, colorScheme),
+          ],
+
+          _buildSectionHeader(
+            context,
+            'Information',
+            Icons.table_chart_outlined,
+            colorScheme,
+          ),
+          _buildMetadataTable(context, liveExtension, colorScheme),
+
+          _buildSectionHeader(
+            context,
+            'Capabilities',
+            Icons.extension_outlined,
+            colorScheme,
+          ),
+          _buildCapabilities(context, liveExtension, colorScheme),
+
+          const SliverToBoxAdapter(child: SizedBox(height: 32)),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildAppBar(
+    BuildContext context,
+    StoreExtension ext,
+    ColorScheme colorScheme,
+  ) {
+    return SliverAppBar(
+      expandedHeight: 200,
+      pinned: true,
+      stretch: true,
+      backgroundColor: colorScheme.surface,
+      surfaceTintColor: Colors.transparent,
+      flexibleSpace: FlexibleSpaceBar(
+        background: Center(
+          child: Padding(
+            padding: const EdgeInsets.only(top: kToolbarHeight),
+            child: Container(
+              width: 100,
+              height: 100,
+              decoration: BoxDecoration(
+                borderRadius: BorderRadius.circular(24),
+                color: colorScheme.surfaceContainerHighest,
+                boxShadow: [
+                  BoxShadow(
+                    color: Colors.black.withValues(alpha: 0.1),
+                    blurRadius: 16,
+                    offset: const Offset(0, 4),
+                  ),
+                ],
+              ),
+              child: ClipRRect(
+                borderRadius: BorderRadius.circular(24),
+                child: ext.iconUrl != null && ext.iconUrl!.isNotEmpty
+                    ? Image.network(
+                        ext.iconUrl!,
+                        fit: BoxFit.cover,
+                        errorBuilder: (context, error, stackTrace) =>
+                            _buildFallbackIcon(ext, colorScheme, 50),
+                      )
+                    : _buildFallbackIcon(ext, colorScheme, 50),
+              ),
+            ),
+          ),
+        ),
+      ),
+      leading: IconButton(
+        icon: const Icon(Icons.arrow_back),
+        onPressed: () => Navigator.pop(context),
+      ),
+    );
+  }
+
+  Widget _buildFallbackIcon(
+    StoreExtension ext,
+    ColorScheme colorScheme,
+    double size,
+  ) {
+    return Container(
+      color: colorScheme.surfaceContainerHighest,
+      child: Icon(
+        _getCategoryIcon(ext.category),
+        size: size,
+        color: colorScheme.onSurfaceVariant,
+      ),
+    );
+  }
+
+  Widget _buildInfoCard(
+    BuildContext context,
+    StoreExtension ext,
+    ColorScheme colorScheme,
+    bool isDownloading,
+  ) {
+    return SliverToBoxAdapter(
+      child: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Card(
+          elevation: 0,
+          color: colorScheme.surfaceContainerLow,
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(20),
+          ),
+          child: Padding(
+            padding: const EdgeInsets.all(20),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Row(
+                  children: [
+                    Expanded(
+                      child: Column(
+                        crossAxisAlignment: CrossAxisAlignment.start,
+                        children: [
+                          Text(
+                            ext.displayName,
+                            style: Theme.of(context).textTheme.headlineSmall
+                                ?.copyWith(
+                                  fontWeight: FontWeight.bold,
+                                  color: colorScheme.onSurface,
+                                ),
+                          ),
+                          const SizedBox(height: 4),
+                          Text(
+                            'by ${ext.author}',
+                            style: Theme.of(context).textTheme.bodyLarge
+                                ?.copyWith(color: colorScheme.onSurfaceVariant),
+                          ),
+                        ],
+                      ),
+                    ),
+                  ],
+                ),
+
+                const SizedBox(height: 16),
+
+                // Badges row
+                Wrap(
+                  spacing: 8,
+                  runSpacing: 8,
+                  children: [
+                    _Badge(
+                      label: 'v${ext.version}',
+                      color: colorScheme.secondaryContainer,
+                      textColor: colorScheme.onSecondaryContainer,
+                    ),
+                    _Badge(
+                      label: _getCategoryName(ext.category),
+                      color: colorScheme.tertiaryContainer,
+                      textColor: colorScheme.onTertiaryContainer,
+                    ),
+                    if (ext.isInstalled)
+                      _Badge(
+                        label: 'Installed',
+                        color: colorScheme.primaryContainer,
+                        textColor: colorScheme.onPrimaryContainer,
+                        icon: Icons.check,
+                      ),
+                  ],
+                ),
+
+                const SizedBox(height: 24),
+
+                // Action Buttons
+                if (isDownloading)
+                  Center(
+                    child: CircularProgressIndicator(
+                      color: colorScheme.primary,
+                    ),
+                  )
+                else ...[
+                  if (ext.hasUpdate)
+                    FilledButton.icon(
+                      onPressed: () => _updateExtension(ext),
+                      icon: const Icon(Icons.update),
+                      label: Text('Update to v${ext.version}'),
+                      style: FilledButton.styleFrom(
+                        minimumSize: const Size.fromHeight(52),
+                        shape: RoundedRectangleBorder(
+                          borderRadius: BorderRadius.circular(16),
+                        ),
+                      ),
+                    )
+                  else if (ext.isInstalled)
+                    Row(
+                      children: [
+                        Expanded(
+                          child: OutlinedButton.icon(
+                            onPressed: null,
+                            icon: const Icon(Icons.check),
+                            label: const Text('Installed'),
+                            style: OutlinedButton.styleFrom(
+                              minimumSize: const Size(0, 52),
+                              shape: RoundedRectangleBorder(
+                                borderRadius: BorderRadius.circular(16),
+                              ),
+                            ),
+                          ),
+                        ),
+                        const SizedBox(width: 12),
+                        IconButton.filled(
+                          onPressed: () => _uninstallExtension(ext),
+                          icon: const Icon(Icons.delete_outline),
+                          style: IconButton.styleFrom(
+                            backgroundColor: colorScheme.errorContainer,
+                            foregroundColor: colorScheme.onErrorContainer,
+                            minimumSize: const Size(52, 52),
+                            shape: RoundedRectangleBorder(
+                              borderRadius: BorderRadius.circular(16),
+                            ),
+                          ),
+                          tooltip: 'Uninstall',
+                        ),
+                      ],
+                    )
+                  else
+                    FilledButton.icon(
+                      onPressed: () => _installExtension(ext),
+                      icon: const Icon(Icons.download),
+                      label: const Text('Install Extension'),
+                      style: FilledButton.styleFrom(
+                        minimumSize: const Size.fromHeight(52),
+                        shape: RoundedRectangleBorder(
+                          borderRadius: BorderRadius.circular(16),
+                        ),
+                      ),
+                    ),
+                ],
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildSectionHeader(
+    BuildContext context,
+    String title,
+    IconData icon,
+    ColorScheme colorScheme,
+  ) {
+    return SliverToBoxAdapter(
+      child: Padding(
+        padding: const EdgeInsets.fromLTRB(20, 8, 20, 8),
+        child: Row(
+          children: [
+            Icon(icon, size: 20, color: colorScheme.primary),
+            const SizedBox(width: 8),
+            Text(
+              title,
+              style: Theme.of(context).textTheme.titleMedium?.copyWith(
+                fontWeight: FontWeight.w600,
+                color: colorScheme.onSurface,
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildDescription(
+    BuildContext context,
+    StoreExtension ext,
+    ColorScheme colorScheme,
+  ) {
+    return SliverToBoxAdapter(
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 8),
+        child: Text(
+          ext.description,
+          style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+            height: 1.5,
+            color: colorScheme.onSurface,
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildTags(
+    BuildContext context,
+    StoreExtension ext,
+    ColorScheme colorScheme,
+  ) {
+    return SliverToBoxAdapter(
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 8),
+        child: Wrap(
+          spacing: 8,
+          runSpacing: 8,
+          children: ext.tags
+              .map(
+                (tag) => Chip(
+                  label: Text(tag),
+                  backgroundColor: colorScheme.surfaceContainer,
+                  labelStyle: Theme.of(context).textTheme.bodySmall?.copyWith(
+                    color: colorScheme.onSurfaceVariant,
+                  ),
+                  side: BorderSide.none,
+                  shape: RoundedRectangleBorder(
+                    borderRadius: BorderRadius.circular(20),
+                  ),
+                ),
+              )
+              .toList(),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildMetadataTable(
+    BuildContext context,
+    StoreExtension ext,
+    ColorScheme colorScheme,
+  ) {
+    return SliverPadding(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+      sliver: SliverToBoxAdapter(
+        child: Card(
+          elevation: 0,
+          color: colorScheme.surfaceContainer,
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(16),
+          ),
+          child: Column(
+            children: [
+              _MetadataRow(
+                label: 'Updated',
+                value: ext.updatedAt.isNotEmpty
+                    ? _formatDate(ext.updatedAt)
+                    : '-',
+                colorScheme: colorScheme,
+              ),
+              _MetadataRow(
+                label: 'ID',
+                value: ext.id,
+                colorScheme: colorScheme,
+              ),
+              _MetadataRow(
+                label: 'Min App Version',
+                value: ext.minAppVersion ?? 'Any',
+                colorScheme: colorScheme,
+                isLast: true,
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildCapabilities(
+    BuildContext context,
+    StoreExtension ext,
+    ColorScheme colorScheme,
+  ) {
+    // Determine capabilities based on category
+    final isMetadataProvider = ext.category == 'metadata' || ext.category == 'integration';
+    final isDownloadProvider = ext.category == 'download';
+    final isLyricsProvider = ext.category == 'lyrics';
+    final isUtility = ext.category == 'utility';
+
+    return SliverPadding(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+      sliver: SliverToBoxAdapter(
+        child: Card(
+          elevation: 0,
+          color: colorScheme.surfaceContainer,
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(16),
+          ),
+          child: Column(
+            children: [
+              _CapabilityRow(
+                icon: Icons.search,
+                label: 'Metadata Provider',
+                enabled: isMetadataProvider,
+                colorScheme: colorScheme,
+              ),
+              _CapabilityRow(
+                icon: Icons.download,
+                label: 'Download Provider',
+                enabled: isDownloadProvider,
+                colorScheme: colorScheme,
+              ),
+              _CapabilityRow(
+                icon: Icons.lyrics,
+                label: 'Lyrics Provider',
+                enabled: isLyricsProvider,
+                colorScheme: colorScheme,
+              ),
+              _CapabilityRow(
+                icon: Icons.build,
+                label: 'Utility Functions',
+                enabled: isUtility,
+                colorScheme: colorScheme,
+                isLast: true,
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  String _formatDate(String dateStr) {
+    try {
+      final date = DateTime.parse(dateStr);
+      final now = DateTime.now();
+      final diff = now.difference(date);
+      
+      if (diff.inDays == 0) {
+        return 'Today';
+      } else if (diff.inDays == 1) {
+        return 'Yesterday';
+      } else if (diff.inDays < 7) {
+        return '${diff.inDays} days ago';
+      } else if (diff.inDays < 30) {
+        return '${(diff.inDays / 7).floor()} weeks ago';
+      } else if (diff.inDays < 365) {
+        return '${(diff.inDays / 30).floor()} months ago';
+      } else {
+        return '${date.year}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
+      }
+    } catch (_) {
+      return dateStr.split('T').first;
+    }
+  }
+
+  IconData _getCategoryIcon(String category) {
+    switch (category) {
+      case 'metadata':
+        return Icons.label_outline;
+      case 'download':
+        return Icons.download_outlined;
+      case 'utility':
+        return Icons.build_outlined;
+      case 'lyrics':
+        return Icons.lyrics_outlined;
+      case 'integration':
+        return Icons.link;
+      default:
+        return Icons.extension;
+    }
+  }
+
+  String _getCategoryName(String category) {
+    switch (category) {
+      case 'metadata':
+        return 'Metadata';
+      case 'download':
+        return 'Download';
+      case 'utility':
+        return 'Utility';
+      case 'lyrics':
+        return 'Lyrics';
+      case 'integration':
+        return 'Integration';
+      default:
+        return category;
+    }
+  }
+
+  Future<void> _installExtension(StoreExtension ext) async {
+    final tempDir = await getTemporaryDirectory();
+    final appDir = await getApplicationDocumentsDirectory();
+    final extensionsDir = '${appDir.path}/extensions';
+
+    final success = await ref
+        .read(storeProvider.notifier)
+        .installExtension(ext.id, tempDir.path, extensionsDir);
+
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(
+            success
+                ? '${ext.displayName} installed.'
+                : 'Failed to install ${ext.displayName}',
+          ),
+          behavior: SnackBarBehavior.floating,
+        ),
+      );
+    }
+  }
+
+  Future<void> _updateExtension(StoreExtension ext) async {
+    final tempDir = await getTemporaryDirectory();
+
+    final success = await ref
+        .read(storeProvider.notifier)
+        .updateExtension(ext.id, tempDir.path);
+
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(
+            success
+                ? '${ext.displayName} updated.'
+                : 'Failed to update ${ext.displayName}',
+          ),
+          behavior: SnackBarBehavior.floating,
+        ),
+      );
+    }
+  }
+
+  Future<void> _uninstallExtension(StoreExtension ext) async {
+    final confirm = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('Uninstall Extension?'),
+        content: Text('Are you sure you want to remove ${ext.displayName}?'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context, false),
+            child: const Text('Cancel'),
+          ),
+          TextButton(
+            onPressed: () => Navigator.pop(context, true),
+            child: Text(
+              'Uninstall',
+              style: TextStyle(color: Theme.of(context).colorScheme.error),
+            ),
+          ),
+        ],
+      ),
+    );
+
+    if (confirm == true) {
+      await ref.read(extensionProvider.notifier).removeExtension(ext.id);
+      await ref.read(storeProvider.notifier).refresh();
+      if (mounted) {
+        Navigator.pop(context);
+      }
+    }
+  }
+}
+
+class _Badge extends StatelessWidget {
+  final String label;
+  final Color color;
+  final Color textColor;
+  final IconData? icon;
+
+  const _Badge({
+    required this.label,
+    required this.color,
+    required this.textColor,
+    this.icon,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
+      decoration: BoxDecoration(
+        color: color,
+        borderRadius: BorderRadius.circular(8),
+      ),
+      child: Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          if (icon != null) ...[
+            Icon(icon, size: 14, color: textColor),
+            const SizedBox(width: 4),
+          ],
+          Text(
+            label,
+            style: TextStyle(
+              fontSize: 12,
+              fontWeight: FontWeight.w600,
+              color: textColor,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class _MetadataRow extends StatelessWidget {
+  final String label;
+  final String value;
+  final ColorScheme colorScheme;
+  final bool isLast;
+
+  const _MetadataRow({
+    required this.label,
+    required this.value,
+    required this.colorScheme,
+    this.isLast = false,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+          child: Row(
+            mainAxisAlignment: MainAxisAlignment.spaceBetween,
+            children: [
+              Text(
+                label,
+                style: TextStyle(
+                  color: colorScheme.onSurfaceVariant,
+                  fontSize: 14,
+                ),
+              ),
+              Expanded(
+                child: Text(
+                  value,
+                  textAlign: TextAlign.end,
+                  style: TextStyle(
+                    color: colorScheme.onSurface,
+                    fontWeight: FontWeight.w500,
+                    fontSize: 14,
+                  ),
+                  overflow: TextOverflow.ellipsis,
+                ),
+              ),
+            ],
+          ),
+        ),
+        if (!isLast)
+          Divider(
+            height: 1,
+            thickness: 1,
+            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+            indent: 16,
+            endIndent: 16,
+          ),
+      ],
+    );
+  }
+}
+
+class _CapabilityRow extends StatelessWidget {
+  final IconData icon;
+  final String label;
+  final bool enabled;
+  final ColorScheme colorScheme;
+  final bool isLast;
+
+  const _CapabilityRow({
+    required this.icon,
+    required this.label,
+    required this.enabled,
+    required this.colorScheme,
+    this.isLast = false,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+          child: Row(
+            children: [
+              Icon(
+                icon,
+                size: 20,
+                color: enabled ? colorScheme.primary : colorScheme.outline,
+              ),
+              const SizedBox(width: 12),
+              Expanded(
+                child: Text(
+                  label,
+                  style: TextStyle(
+                    color: colorScheme.onSurface,
+                    fontSize: 14,
+                  ),
+                ),
+              ),
+              Icon(
+                enabled ? Icons.check_circle : Icons.cancel_outlined,
+                size: 20,
+                color: enabled ? colorScheme.primary : colorScheme.outline,
+              ),
+            ],
+          ),
+        ),
+        if (!isLast)
+          Divider(
+            height: 1,
+            thickness: 1,
+            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+            indent: 16,
+            endIndent: 16,
+          ),
+      ],
+    );
+  }
+}

lib/screens/store_tab.dart

@@ -0,0 +1,622 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:spotiflac_android/providers/store_provider.dart';
+import 'package:spotiflac_android/widgets/settings_group.dart';
+import 'package:spotiflac_android/screens/store/extension_details_screen.dart';
+
+class StoreTab extends ConsumerStatefulWidget {
+  const StoreTab({super.key});
+
+  @override
+  ConsumerState<StoreTab> createState() => _StoreTabState();
+}
+
+class _StoreTabState extends ConsumerState<StoreTab> {
+  final _searchController = TextEditingController();
+  bool _isInitialized = false;
+
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addPostFrameCallback((_) => _initialize());
+  }
+
+  Future<void> _initialize() async {
+    if (_isInitialized) return;
+    _isInitialized = true;
+
+    final cacheDir = await getApplicationCacheDirectory();
+
+    // Check if widget is still mounted after async operation
+    if (!mounted) return;
+
+    await ref.read(storeProvider.notifier).initialize(cacheDir.path);
+  }
+
+  @override
+  void dispose() {
+    _searchController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final state = ref.watch(storeProvider);
+    final colorScheme = Theme.of(context).colorScheme;
+    final topPadding = MediaQuery.of(context).padding.top;
+
+    return Scaffold(
+      body: RefreshIndicator(
+        onRefresh: () =>
+            ref.read(storeProvider.notifier).refresh(forceRefresh: true),
+        child: CustomScrollView(
+          slivers: [
+            // App Bar - consistent with other tabs
+            SliverAppBar(
+              expandedHeight: 120 + topPadding,
+              collapsedHeight: kToolbarHeight,
+              floating: false,
+              pinned: true,
+              backgroundColor: colorScheme.surface,
+              surfaceTintColor: Colors.transparent,
+              automaticallyImplyLeading: false,
+              flexibleSpace: LayoutBuilder(
+                builder: (context, constraints) {
+                  final maxHeight = 120 + topPadding;
+                  final minHeight = kToolbarHeight + topPadding;
+                  final expandRatio =
+                      ((constraints.maxHeight - minHeight) /
+                              (maxHeight - minHeight))
+                          .clamp(0.0, 1.0);
+
+                  return FlexibleSpaceBar(
+                    expandedTitleScale: 1.0,
+                    titlePadding: const EdgeInsets.only(left: 24, bottom: 16),
+                    title: Text(
+                      'Store',
+                      style: TextStyle(
+                        fontSize: 20 + (14 * expandRatio),
+                        fontWeight: FontWeight.bold,
+                        color: colorScheme.onSurface,
+                      ),
+                    ),
+                  );
+                },
+              ),
+            ),
+
+            // Search Bar
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
+                child: TextField(
+                  controller: _searchController,
+                  decoration: InputDecoration(
+                    hintText: 'Search extensions...',
+                    prefixIcon: const Icon(Icons.search),
+                    suffixIcon: _searchController.text.isNotEmpty
+                        ? IconButton(
+                            icon: const Icon(Icons.clear),
+                            onPressed: () {
+                              _searchController.clear();
+                              ref
+                                  .read(storeProvider.notifier)
+                                  .setSearchQuery('');
+                            },
+                          )
+                        : null,
+                    border: OutlineInputBorder(
+                      borderRadius: BorderRadius.circular(28),
+                      borderSide: BorderSide.none,
+                    ),
+                    filled: true,
+                    fillColor: Theme.of(context).brightness == Brightness.dark
+                        ? Color.alphaBlend(
+                            Colors.white.withValues(alpha: 0.08),
+                            colorScheme.surface,
+                          )
+                        : colorScheme.surfaceContainerHighest,
+                    contentPadding: const EdgeInsets.symmetric(
+                      horizontal: 16,
+                      vertical: 12,
+                    ),
+                  ),
+                  onChanged: (value) {
+                    ref.read(storeProvider.notifier).setSearchQuery(value);
+                    setState(() {}); // Update suffix icon
+                  },
+                ),
+              ),
+            ),
+
+            // Category Chips
+            SliverToBoxAdapter(
+              child: SingleChildScrollView(
+                scrollDirection: Axis.horizontal,
+                padding: const EdgeInsets.symmetric(
+                  horizontal: 16,
+                  vertical: 8,
+                ),
+                child: Row(
+                  children: [
+                    _CategoryChip(
+                      label: 'All',
+                      icon: Icons.apps,
+                      isSelected: state.selectedCategory == null,
+                      onTap: () =>
+                          ref.read(storeProvider.notifier).setCategory(null),
+                    ),
+                    const SizedBox(width: 8),
+                    _CategoryChip(
+                      label: 'Metadata',
+                      icon: Icons.label_outline,
+                      isSelected:
+                          state.selectedCategory == StoreCategory.metadata,
+                      onTap: () => ref
+                          .read(storeProvider.notifier)
+                          .setCategory(StoreCategory.metadata),
+                    ),
+                    const SizedBox(width: 8),
+                    _CategoryChip(
+                      label: 'Download',
+                      icon: Icons.download_outlined,
+                      isSelected:
+                          state.selectedCategory == StoreCategory.download,
+                      onTap: () => ref
+                          .read(storeProvider.notifier)
+                          .setCategory(StoreCategory.download),
+                    ),
+                    const SizedBox(width: 8),
+                    _CategoryChip(
+                      label: 'Utility',
+                      icon: Icons.build_outlined,
+                      isSelected:
+                          state.selectedCategory == StoreCategory.utility,
+                      onTap: () => ref
+                          .read(storeProvider.notifier)
+                          .setCategory(StoreCategory.utility),
+                    ),
+                    const SizedBox(width: 8),
+                    _CategoryChip(
+                      label: 'Lyrics',
+                      icon: Icons.lyrics_outlined,
+                      isSelected:
+                          state.selectedCategory == StoreCategory.lyrics,
+                      onTap: () => ref
+                          .read(storeProvider.notifier)
+                          .setCategory(StoreCategory.lyrics),
+                    ),
+                    const SizedBox(width: 8),
+                    _CategoryChip(
+                      label: 'Integration',
+                      icon: Icons.link,
+                      isSelected:
+                          state.selectedCategory == StoreCategory.integration,
+                      onTap: () => ref
+                          .read(storeProvider.notifier)
+                          .setCategory(StoreCategory.integration),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+
+            // Content
+            if (state.isLoading && state.extensions.isEmpty)
+              const SliverFillRemaining(
+                child: Center(child: CircularProgressIndicator()),
+              )
+            else if (state.error != null && state.extensions.isEmpty)
+              SliverFillRemaining(
+                child: _buildErrorState(state.error!, colorScheme),
+              )
+            else if (state.filteredExtensions.isEmpty)
+              SliverFillRemaining(child: _buildEmptyState(state, colorScheme))
+            else ...[
+              // Extensions count
+              SliverToBoxAdapter(
+                child: Padding(
+                  padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
+                  child: Text(
+                    '${state.filteredExtensions.length} ${state.filteredExtensions.length == 1 ? 'extension' : 'extensions'}',
+                    style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                      color: colorScheme.onSurfaceVariant,
+                    ),
+                  ),
+                ),
+              ),
+
+              // Extensions list in grouped card (like queue_tab)
+              SliverToBoxAdapter(
+                child: Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 16),
+                  child: SettingsGroup(
+                    children: state.filteredExtensions.asMap().entries.map((
+                      entry,
+                    ) {
+                      final index = entry.key;
+                      final ext = entry.value;
+                      return _ExtensionItem(
+                        extension: ext,
+                        showDivider:
+                            index < state.filteredExtensions.length - 1,
+                        isDownloading: state.downloadingId == ext.id,
+                        onInstall: () => _installExtension(ext),
+                        onUpdate: () => _updateExtension(ext),
+                        onTap: () => _showExtensionDetails(ext),
+                      );
+                    }).toList(),
+                  ),
+                ),
+              ),
+
+              // Bottom padding
+              const SliverToBoxAdapter(child: SizedBox(height: 16)),
+            ],
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildErrorState(String error, ColorScheme colorScheme) {
+    return Center(
+      child: Padding(
+        padding: const EdgeInsets.all(32),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Icon(Icons.error_outline, size: 64, color: colorScheme.error),
+            const SizedBox(height: 16),
+            Text(
+              'Failed to load store',
+              style: Theme.of(context).textTheme.titleMedium,
+            ),
+            const SizedBox(height: 8),
+            Text(
+              error,
+              style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                color: colorScheme.onSurfaceVariant,
+              ),
+              textAlign: TextAlign.center,
+            ),
+            const SizedBox(height: 24),
+            FilledButton.icon(
+              onPressed: () =>
+                  ref.read(storeProvider.notifier).refresh(forceRefresh: true),
+              icon: const Icon(Icons.refresh),
+              label: const Text('Retry'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildEmptyState(StoreState state, ColorScheme colorScheme) {
+    final hasFilters =
+        state.searchQuery.isNotEmpty || state.selectedCategory != null;
+
+    return Center(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Icon(
+            hasFilters ? Icons.search_off : Icons.extension_off,
+            size: 64,
+            color: colorScheme.onSurfaceVariant,
+          ),
+          const SizedBox(height: 16),
+          Text(
+            hasFilters ? 'No extensions found' : 'No extensions available',
+            style: Theme.of(context).textTheme.titleMedium?.copyWith(
+              color: colorScheme.onSurfaceVariant,
+            ),
+          ),
+          if (hasFilters) ...[
+            const SizedBox(height: 8),
+            TextButton(
+              onPressed: () {
+                _searchController.clear();
+                ref.read(storeProvider.notifier).clearSearch();
+              },
+              child: const Text('Clear filters'),
+            ),
+          ],
+        ],
+      ),
+    );
+  }
+
+  void _showExtensionDetails(StoreExtension ext) {
+    Navigator.of(context).push(
+      MaterialPageRoute(
+        builder: (context) => ExtensionDetailsScreen(extension: ext),
+      ),
+    );
+  }
+
+  Future<void> _installExtension(StoreExtension ext) async {
+    final tempDir = await getTemporaryDirectory();
+    final appDir = await getApplicationDocumentsDirectory();
+    final extensionsDir = '${appDir.path}/extensions';
+
+    final success = await ref
+        .read(storeProvider.notifier)
+        .installExtension(ext.id, tempDir.path, extensionsDir);
+
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(
+            success
+                ? '${ext.displayName} installed. Enable it in Settings > Extensions'
+                : 'Failed to install ${ext.displayName}',
+          ),
+          behavior: SnackBarBehavior.floating,
+        ),
+      );
+    }
+  }
+
+  Future<void> _updateExtension(StoreExtension ext) async {
+    final tempDir = await getTemporaryDirectory();
+
+    final success = await ref
+        .read(storeProvider.notifier)
+        .updateExtension(ext.id, tempDir.path);
+
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(
+            success
+                ? '${ext.displayName} updated to v${ext.version}'
+                : 'Failed to update ${ext.displayName}',
+          ),
+          behavior: SnackBarBehavior.floating,
+        ),
+      );
+    }
+  }
+}
+
+class _CategoryChip extends StatelessWidget {
+  final String label;
+  final IconData icon;
+  final bool isSelected;
+  final VoidCallback onTap;
+
+  const _CategoryChip({
+    required this.label,
+    required this.icon,
+    required this.isSelected,
+    required this.onTap,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return FilterChip(
+      label: Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [Icon(icon, size: 16), const SizedBox(width: 6), Text(label)],
+      ),
+      selected: isSelected,
+      onSelected: (_) => onTap(),
+      showCheckmark: false,
+    );
+  }
+}
+
+class _ExtensionItem extends StatelessWidget {
+  final StoreExtension extension;
+  final bool showDivider;
+  final bool isDownloading;
+  final VoidCallback onInstall;
+  final VoidCallback onUpdate;
+  final VoidCallback? onTap;
+
+  const _ExtensionItem({
+    required this.extension,
+    required this.showDivider,
+    required this.isDownloading,
+    required this.onInstall,
+    required this.onUpdate,
+    this.onTap,
+  });
+
+  IconData _getCategoryIcon(String category) {
+    switch (category) {
+      case StoreCategory.metadata:
+        return Icons.label_outline;
+      case StoreCategory.download:
+        return Icons.download_outlined;
+      case StoreCategory.utility:
+        return Icons.build_outlined;
+      case StoreCategory.lyrics:
+        return Icons.lyrics_outlined;
+      case StoreCategory.integration:
+        return Icons.link;
+      default:
+        return Icons.extension;
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        InkWell(
+          onTap: onTap,
+          child: Padding(
+            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+            child: Row(
+              children: [
+                // Extension icon - custom or category-based
+                Container(
+                  width: 44,
+                  height: 44,
+                  decoration: BoxDecoration(
+                    color: extension.isInstalled
+                        ? colorScheme.primaryContainer
+                        : colorScheme.surfaceContainerHighest,
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                  clipBehavior: Clip.antiAlias,
+                  child:
+                      extension.iconUrl != null && extension.iconUrl!.isNotEmpty
+                      ? Image.network(
+                          extension.iconUrl!,
+                          width: 44,
+                          height: 44,
+                          fit: BoxFit.cover,
+                          errorBuilder: (context, error, stackTrace) => Icon(
+                            _getCategoryIcon(extension.category),
+                            color: extension.isInstalled
+                                ? colorScheme.onPrimaryContainer
+                                : colorScheme.onSurfaceVariant,
+                          ),
+                          loadingBuilder: (context, child, loadingProgress) {
+                            if (loadingProgress == null) return child;
+                            return Center(
+                              child: SizedBox(
+                                width: 20,
+                                height: 20,
+                                child: CircularProgressIndicator(
+                                  strokeWidth: 2,
+                                  value:
+                                      loadingProgress.expectedTotalBytes != null
+                                      ? loadingProgress.cumulativeBytesLoaded /
+                                            loadingProgress.expectedTotalBytes!
+                                      : null,
+                                ),
+                              ),
+                            );
+                          },
+                        )
+                      : Icon(
+                          _getCategoryIcon(extension.category),
+                          color: extension.isInstalled
+                              ? colorScheme.onPrimaryContainer
+                              : colorScheme.onSurfaceVariant,
+                        ),
+                ),
+                const SizedBox(width: 16),
+                // Extension info
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Row(
+                        children: [
+                          Expanded(
+                            child: Text(
+                              extension.displayName,
+                              style: Theme.of(context).textTheme.bodyLarge
+                                  ?.copyWith(fontWeight: FontWeight.w500),
+                            ),
+                          ),
+                          // Version badge
+                          Container(
+                            padding: const EdgeInsets.symmetric(
+                              horizontal: 6,
+                              vertical: 2,
+                            ),
+                            decoration: BoxDecoration(
+                              color: colorScheme.surfaceContainerHighest,
+                              borderRadius: BorderRadius.circular(6),
+                            ),
+                            child: Text(
+                              'v${extension.version}',
+                              style: Theme.of(context).textTheme.labelSmall
+                                  ?.copyWith(
+                                    color: colorScheme.onSurfaceVariant,
+                                  ),
+                            ),
+                          ),
+                        ],
+                      ),
+                      const SizedBox(height: 2),
+                      Text(
+                        'by ${extension.author}',
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                      const SizedBox(height: 4),
+                      Text(
+                        extension.description,
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                        ),
+                        maxLines: 2,
+                        overflow: TextOverflow.ellipsis,
+                      ),
+                    ],
+                  ),
+                ),
+                const SizedBox(width: 12),
+                // Action button
+                if (isDownloading)
+                  const SizedBox(
+                    width: 24,
+                    height: 24,
+                    child: CircularProgressIndicator(strokeWidth: 2),
+                  )
+                else if (extension.hasUpdate)
+                  FilledButton.tonal(
+                    onPressed: onUpdate,
+                    style: FilledButton.styleFrom(
+                      padding: const EdgeInsets.symmetric(horizontal: 12),
+                      minimumSize: const Size(0, 36),
+                    ),
+                    child: const Text('Update'),
+                  )
+                else if (extension.isInstalled)
+                  OutlinedButton(
+                    onPressed: null,
+                    style: OutlinedButton.styleFrom(
+                      padding: const EdgeInsets.symmetric(horizontal: 12),
+                      minimumSize: const Size(0, 36),
+                    ),
+                    child: Row(
+                      mainAxisSize: MainAxisSize.min,
+                      children: [
+                        Icon(Icons.check, size: 16, color: colorScheme.outline),
+                        const SizedBox(width: 4),
+                        Text(
+                          'Installed',
+                          style: TextStyle(color: colorScheme.outline),
+                        ),
+                      ],
+                    ),
+                  )
+                else
+                  FilledButton(
+                    onPressed: onInstall,
+                    style: FilledButton.styleFrom(
+                      padding: const EdgeInsets.symmetric(horizontal: 12),
+                      minimumSize: const Size(0, 36),
+                    ),
+                    child: const Text('Install'),
+                  ),
+              ],
+            ),
+          ),
+        ),
+        if (showDivider)
+          Divider(
+            height: 1,
+            thickness: 1,
+            indent: 76,
+            endIndent: 16,
+            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+          ),
+      ],
+    );
+  }
+}

lib/screens/track_metadata_screen.dart

@@ -34,7 +34,13 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
   }
 
   Future<void> _checkFile() async {
-    final file = File(widget.item.filePath);
+    // Strip EXISTS: prefix from legacy history items
+    var filePath = widget.item.filePath;
+    if (filePath.startsWith('EXISTS:')) {
+      filePath = filePath.substring(7);
+    }
+    
+    final file = File(filePath);
     final exists = await file.exists();
     int? size;
     
@@ -67,6 +73,12 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
   int? get discNumber => item.discNumber;
   String? get releaseDate => item.releaseDate;
   String? get isrc => item.isrc;
+  
+  // Clean filePath - strip EXISTS: prefix from legacy history items
+  String get cleanFilePath {
+    final path = item.filePath;
+    return path.startsWith('EXISTS:') ? path.substring(7) : path;
+  }
   int? get bitDepth => item.bitDepth;
   int? get sampleRate => item.sampleRate;
 
@@ -515,7 +527,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
   }
 
   Widget _buildFileInfoCard(BuildContext context, ColorScheme colorScheme, bool fileExists, int? fileSize) {
-    final fileName = item.filePath.split(Platform.pathSeparator).last;
+    final fileName = cleanFilePath.split(Platform.pathSeparator).last;
     final fileExtension = fileName.contains('.') ? fileName.split('.').last.toUpperCase() : 'Unknown';
     
     return Card(
@@ -631,7 +643,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
             
             // File path
             InkWell(
-              onTap: () => _copyToClipboard(context, item.filePath),
+              onTap: () => _copyToClipboard(context, cleanFilePath),
               borderRadius: BorderRadius.circular(12),
               child: Container(
                 padding: const EdgeInsets.all(12),
@@ -643,7 +655,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
                   children: [
                     Expanded(
                       child: Text(
-                        item.filePath,
+                        cleanFilePath,
                         style: Theme.of(context).textTheme.bodySmall?.copyWith(
                           fontFamily: 'monospace',
                           color: colorScheme.onSurfaceVariant,
@@ -776,7 +788,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
         item.spotifyId ?? '',
         item.trackName,
         item.artistName,
-        filePath: _fileExists ? item.filePath : null, // Try embedded lyrics first
+        filePath: _fileExists ? cleanFilePath : null, // Try embedded lyrics first
       ).timeout(
         const Duration(seconds: 20),
         onTimeout: () => '', // Return empty string on timeout
@@ -833,7 +845,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
         Expanded(
           flex: 2,
           child: FilledButton.icon(
-            onPressed: fileExists ? () => _openFile(context, item.filePath) : null,
+            onPressed: fileExists ? () => _openFile(context, cleanFilePath) : null,
             icon: const Icon(Icons.play_arrow),
             label: const Text('Play'),
             style: FilledButton.styleFrom(
@@ -890,7 +902,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
               title: const Text('Copy file path'),
               onTap: () {
                 Navigator.pop(context);
-                _copyToClipboard(context, item.filePath);
+                _copyToClipboard(context, cleanFilePath);
               },
             ),
             ListTile(
@@ -933,7 +945,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
             onPressed: () async {
               // Delete the file first
               try {
-                final file = File(item.filePath);
+                final file = File(cleanFilePath);
                 if (await file.exists()) {
                   await file.delete();
                 }
@@ -984,7 +996,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
   }
 
   Future<void> _shareFile(BuildContext context) async {
-    final file = File(item.filePath);
+    final file = File(cleanFilePath);
     if (!await file.exists()) {
       if (context.mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
@@ -996,7 +1008,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
     
     await SharePlus.instance.share(
       ShareParams(
-        files: [XFile(item.filePath)],
+        files: [XFile(cleanFilePath)],
         text: '${item.trackName} - ${item.artistName}',
       ),
     );

lib/services/platform_bridge.dart

@@ -331,7 +331,6 @@ class PlatformBridge {
   }
 
   /// 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,
@@ -339,6 +338,13 @@ class PlatformBridge {
     });
   }
 
+  /// Check if Spotify credentials are configured
+  /// Returns true if credentials are available (custom or env vars)
+  static Future<bool> hasSpotifyCredentials() async {
+    final result = await _channel.invokeMethod('hasSpotifyCredentials');
+    return result as bool;
+  }
+
   /// Pre-warm track ID cache for album/playlist tracks
   /// This runs in background and returns immediately
   /// Speeds up subsequent downloads by caching ISRC → Track ID mappings
@@ -439,4 +445,418 @@ class PlatformBridge {
   static Future<void> setGoLoggingEnabled(bool enabled) async {
     await _channel.invokeMethod('setLoggingEnabled', {'enabled': enabled});
   }
+
+  // ==================== EXTENSION SYSTEM ====================
+
+  /// Initialize the extension system
+  static Future<void> initExtensionSystem(String extensionsDir, String dataDir) async {
+    _log.d('initExtensionSystem: $extensionsDir, $dataDir');
+    await _channel.invokeMethod('initExtensionSystem', {
+      'extensions_dir': extensionsDir,
+      'data_dir': dataDir,
+    });
+  }
+
+  /// Load all extensions from directory
+  static Future<Map<String, dynamic>> loadExtensionsFromDir(String dirPath) async {
+    _log.d('loadExtensionsFromDir: $dirPath');
+    final result = await _channel.invokeMethod('loadExtensionsFromDir', {
+      'dir_path': dirPath,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Load a single extension from file
+  static Future<Map<String, dynamic>> loadExtensionFromPath(String filePath) async {
+    _log.d('loadExtensionFromPath: $filePath');
+    final result = await _channel.invokeMethod('loadExtensionFromPath', {
+      'file_path': filePath,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Unload an extension
+  static Future<void> unloadExtension(String extensionId) async {
+    _log.d('unloadExtension: $extensionId');
+    await _channel.invokeMethod('unloadExtension', {
+      'extension_id': extensionId,
+    });
+  }
+
+  /// Remove an extension completely (unload + delete files)
+  static Future<void> removeExtension(String extensionId) async {
+    _log.d('removeExtension: $extensionId');
+    await _channel.invokeMethod('removeExtension', {
+      'extension_id': extensionId,
+    });
+  }
+
+  /// Upgrade an existing extension from a new package file
+  static Future<Map<String, dynamic>> upgradeExtension(String filePath) async {
+    _log.d('upgradeExtension: $filePath');
+    final result = await _channel.invokeMethod('upgradeExtension', {
+      'file_path': filePath,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Check if a package file is an upgrade for an existing extension
+  static Future<Map<String, dynamic>> checkExtensionUpgrade(String filePath) async {
+    _log.d('checkExtensionUpgrade: $filePath');
+    final result = await _channel.invokeMethod('checkExtensionUpgrade', {
+      'file_path': filePath,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Get all installed extensions
+  static Future<List<Map<String, dynamic>>> getInstalledExtensions() async {
+    final result = await _channel.invokeMethod('getInstalledExtensions');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  /// Enable or disable an extension
+  static Future<void> setExtensionEnabled(String extensionId, bool enabled) async {
+    _log.d('setExtensionEnabled: $extensionId = $enabled');
+    await _channel.invokeMethod('setExtensionEnabled', {
+      'extension_id': extensionId,
+      'enabled': enabled,
+    });
+  }
+
+  /// Set provider priority order
+  static Future<void> setProviderPriority(List<String> providerIds) async {
+    _log.d('setProviderPriority: $providerIds');
+    await _channel.invokeMethod('setProviderPriority', {
+      'priority': jsonEncode(providerIds),
+    });
+  }
+
+  /// Get provider priority order
+  static Future<List<String>> getProviderPriority() async {
+    final result = await _channel.invokeMethod('getProviderPriority');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as String).toList();
+  }
+
+  /// Set metadata provider priority order
+  static Future<void> setMetadataProviderPriority(List<String> providerIds) async {
+    _log.d('setMetadataProviderPriority: $providerIds');
+    await _channel.invokeMethod('setMetadataProviderPriority', {
+      'priority': jsonEncode(providerIds),
+    });
+  }
+
+  /// Get metadata provider priority order
+  static Future<List<String>> getMetadataProviderPriority() async {
+    final result = await _channel.invokeMethod('getMetadataProviderPriority');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as String).toList();
+  }
+
+  /// Get extension settings
+  static Future<Map<String, dynamic>> getExtensionSettings(String extensionId) async {
+    final result = await _channel.invokeMethod('getExtensionSettings', {
+      'extension_id': extensionId,
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Set extension settings
+  static Future<void> setExtensionSettings(String extensionId, Map<String, dynamic> settings) async {
+    _log.d('setExtensionSettings: $extensionId');
+    await _channel.invokeMethod('setExtensionSettings', {
+      'extension_id': extensionId,
+      'settings': jsonEncode(settings),
+    });
+  }
+
+  /// Search tracks using extension providers
+  static Future<List<Map<String, dynamic>>> searchTracksWithExtensions(String query, {int limit = 20}) async {
+    _log.d('searchTracksWithExtensions: "$query"');
+    final result = await _channel.invokeMethod('searchTracksWithExtensions', {
+      'query': query,
+      'limit': limit,
+    });
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  /// Download with extension providers (includes fallback)
+  static Future<Map<String, dynamic>> downloadWithExtensions({
+    required String isrc,
+    required String spotifyId,
+    required String trackName,
+    required String artistName,
+    required String albumName,
+    String? albumArtist,
+    String? coverUrl,
+    required String outputDir,
+    required String filenameFormat,
+    String quality = 'LOSSLESS',
+    bool embedLyrics = true,
+    bool embedMaxQualityCover = true,
+    int trackNumber = 1,
+    int discNumber = 1,
+    int totalTracks = 1,
+    String? releaseDate,
+    String? itemId,
+    int durationMs = 0,
+    String? source, // Extension ID that provided this track (prioritize this extension)
+  }) async {
+    _log.i('downloadWithExtensions: "$trackName" by $artistName${source != null ? ' (source: $source)' : ''}');
+    final request = jsonEncode({
+      'isrc': isrc,
+      'spotify_id': spotifyId,
+      'track_name': trackName,
+      'artist_name': artistName,
+      'album_name': albumName,
+      'album_artist': albumArtist ?? artistName,
+      'cover_url': coverUrl,
+      'output_dir': outputDir,
+      'filename_format': filenameFormat,
+      'quality': quality,
+      'embed_lyrics': embedLyrics,
+      'embed_max_quality_cover': embedMaxQualityCover,
+      'track_number': trackNumber,
+      'disc_number': discNumber,
+      'total_tracks': totalTracks,
+      'release_date': releaseDate ?? '',
+      'item_id': itemId ?? '',
+      'duration_ms': durationMs,
+      'source': source ?? '', // Extension ID that provided this track
+    });
+    
+    final result = await _channel.invokeMethod('downloadWithExtensions', request);
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Cleanup all extensions (call on app close)
+  static Future<void> cleanupExtensions() async {
+    _log.d('cleanupExtensions');
+    await _channel.invokeMethod('cleanupExtensions');
+  }
+
+  // ==================== EXTENSION AUTH API ====================
+
+  /// Get pending auth request for an extension (if any)
+  static Future<Map<String, dynamic>?> getExtensionPendingAuth(String extensionId) async {
+    final result = await _channel.invokeMethod('getExtensionPendingAuth', {
+      'extension_id': extensionId,
+    });
+    if (result == null) return null;
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Set auth code for an extension (after OAuth callback)
+  static Future<void> setExtensionAuthCode(String extensionId, String authCode) async {
+    _log.d('setExtensionAuthCode: $extensionId');
+    await _channel.invokeMethod('setExtensionAuthCode', {
+      'extension_id': extensionId,
+      'auth_code': authCode,
+    });
+  }
+
+  /// Set tokens for an extension (after token exchange)
+  static Future<void> setExtensionTokens(
+    String extensionId, {
+    required String accessToken,
+    String? refreshToken,
+    int? expiresIn,
+  }) async {
+    _log.d('setExtensionTokens: $extensionId');
+    await _channel.invokeMethod('setExtensionTokens', {
+      'extension_id': extensionId,
+      'access_token': accessToken,
+      'refresh_token': refreshToken ?? '',
+      'expires_in': expiresIn ?? 0,
+    });
+  }
+
+  /// Clear pending auth request for an extension
+  static Future<void> clearExtensionPendingAuth(String extensionId) async {
+    await _channel.invokeMethod('clearExtensionPendingAuth', {
+      'extension_id': extensionId,
+    });
+  }
+
+  /// Check if extension is authenticated
+  static Future<bool> isExtensionAuthenticated(String extensionId) async {
+    final result = await _channel.invokeMethod('isExtensionAuthenticated', {
+      'extension_id': extensionId,
+    });
+    return result as bool;
+  }
+
+  /// Get all pending auth requests (for polling)
+  static Future<List<Map<String, dynamic>>> getAllPendingAuthRequests() async {
+    final result = await _channel.invokeMethod('getAllPendingAuthRequests');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  // ==================== EXTENSION FFMPEG API ====================
+
+  /// Get pending FFmpeg command for execution
+  static Future<Map<String, dynamic>?> getPendingFFmpegCommand(String commandId) async {
+    final result = await _channel.invokeMethod('getPendingFFmpegCommand', {
+      'command_id': commandId,
+    });
+    if (result == null) return null;
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Set FFmpeg command result
+  static Future<void> setFFmpegCommandResult(
+    String commandId, {
+    required bool success,
+    String output = '',
+    String error = '',
+  }) async {
+    await _channel.invokeMethod('setFFmpegCommandResult', {
+      'command_id': commandId,
+      'success': success,
+      'output': output,
+      'error': error,
+    });
+  }
+
+  /// Get all pending FFmpeg commands
+  static Future<List<Map<String, dynamic>>> getAllPendingFFmpegCommands() async {
+    final result = await _channel.invokeMethod('getAllPendingFFmpegCommands');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  // ==================== EXTENSION CUSTOM SEARCH ====================
+
+  /// Perform custom search using an extension
+  static Future<List<Map<String, dynamic>>> customSearchWithExtension(
+    String extensionId,
+    String query, {
+    Map<String, dynamic>? options,
+  }) async {
+    final result = await _channel.invokeMethod('customSearchWithExtension', {
+      'extension_id': extensionId,
+      'query': query,
+      'options': options != null ? jsonEncode(options) : '',
+    });
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  /// Get all extensions that provide custom search
+  static Future<List<Map<String, dynamic>>> getSearchProviders() async {
+    final result = await _channel.invokeMethod('getSearchProviders');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  // ==================== EXTENSION URL HANDLER ====================
+
+  /// Handle a URL with any matching extension
+  /// Returns null if no extension can handle the URL
+  static Future<Map<String, dynamic>?> handleURLWithExtension(String url) async {
+    try {
+      final result = await _channel.invokeMethod('handleURLWithExtension', {
+        'url': url,
+      });
+      if (result == null || result == '') return null;
+      return jsonDecode(result as String) as Map<String, dynamic>;
+    } catch (e) {
+      // No extension found or error handling URL
+      return null;
+    }
+  }
+
+  /// Find an extension that can handle the given URL
+  /// Returns extension ID or null if none found
+  static Future<String?> findURLHandler(String url) async {
+    final result = await _channel.invokeMethod('findURLHandler', {
+      'url': url,
+    });
+    if (result == null || result == '') return null;
+    return result as String;
+  }
+
+  /// Get all extensions that handle custom URLs
+  static Future<List<Map<String, dynamic>>> getURLHandlers() async {
+    final result = await _channel.invokeMethod('getURLHandlers');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  // ==================== EXTENSION POST-PROCESSING ====================
+
+  /// Run post-processing hooks on a file
+  static Future<Map<String, dynamic>> runPostProcessing(
+    String filePath, {
+    Map<String, dynamic>? metadata,
+  }) async {
+    final result = await _channel.invokeMethod('runPostProcessing', {
+      'file_path': filePath,
+      'metadata': metadata != null ? jsonEncode(metadata) : '',
+    });
+    return jsonDecode(result as String) as Map<String, dynamic>;
+  }
+
+  /// Get all extensions that provide post-processing
+  static Future<List<Map<String, dynamic>>> getPostProcessingProviders() async {
+    final result = await _channel.invokeMethod('getPostProcessingProviders');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  // ==================== EXTENSION STORE ====================
+
+  /// Initialize extension store
+  static Future<void> initExtensionStore(String cacheDir) async {
+    _log.d('initExtensionStore: $cacheDir');
+    await _channel.invokeMethod('initExtensionStore', {'cache_dir': cacheDir});
+  }
+
+  /// Get all extensions from store with installation status
+  static Future<List<Map<String, dynamic>>> getStoreExtensions({bool forceRefresh = false}) async {
+    _log.d('getStoreExtensions (forceRefresh: $forceRefresh)');
+    final result = await _channel.invokeMethod('getStoreExtensions', {
+      'force_refresh': forceRefresh,
+    });
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  /// Search extensions in store
+  static Future<List<Map<String, dynamic>>> searchStoreExtensions(String query, {String? category}) async {
+    _log.d('searchStoreExtensions: "$query" (category: $category)');
+    final result = await _channel.invokeMethod('searchStoreExtensions', {
+      'query': query,
+      'category': category ?? '',
+    });
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.map((e) => e as Map<String, dynamic>).toList();
+  }
+
+  /// Get store categories
+  static Future<List<String>> getStoreCategories() async {
+    final result = await _channel.invokeMethod('getStoreCategories');
+    final list = jsonDecode(result as String) as List<dynamic>;
+    return list.cast<String>();
+  }
+
+  /// Download extension from store
+  static Future<String> downloadStoreExtension(String extensionId, String destDir) async {
+    _log.i('downloadStoreExtension: $extensionId to $destDir');
+    final result = await _channel.invokeMethod('downloadStoreExtension', {
+      'extension_id': extensionId,
+      'dest_dir': destDir,
+    });
+    return result as String;
+  }
+
+  /// Clear store cache
+  static Future<void> clearStoreCache() async {
+    _log.d('clearStoreCache');
+    await _channel.invokeMethod('clearStoreCache');
+  }
 }

lib/widgets/download_service_picker.dart

@@ -0,0 +1,483 @@
+import 'dart:io';
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
+
+/// Built-in service info with quality options
+class BuiltInService {
+  final String id;
+  final String label;
+  final List<QualityOption> qualityOptions;
+
+  const BuiltInService({
+    required this.id,
+    required this.label,
+    required this.qualityOptions,
+  });
+}
+
+/// Default quality options for built-in services (Tidal, Qobuz, Amazon)
+const _builtInServices = [
+  BuiltInService(
+    id: 'tidal',
+    label: 'Tidal',
+    qualityOptions: [
+      QualityOption(id: 'LOSSLESS', label: 'FLAC Lossless', description: '16-bit / 44.1kHz'),
+      QualityOption(id: 'HI_RES', label: 'Hi-Res FLAC', description: '24-bit / up to 96kHz'),
+      QualityOption(id: 'HI_RES_LOSSLESS', label: 'Hi-Res FLAC Max', description: '24-bit / up to 192kHz'),
+    ],
+  ),
+  BuiltInService(
+    id: 'qobuz',
+    label: 'Qobuz',
+    qualityOptions: [
+      QualityOption(id: 'LOSSLESS', label: 'FLAC Lossless', description: '16-bit / 44.1kHz'),
+      QualityOption(id: 'HI_RES', label: 'Hi-Res FLAC', description: '24-bit / up to 96kHz'),
+      QualityOption(id: 'HI_RES_LOSSLESS', label: 'Hi-Res FLAC Max', description: '24-bit / up to 192kHz'),
+    ],
+  ),
+  BuiltInService(
+    id: 'amazon',
+    label: 'Amazon',
+    qualityOptions: [
+      QualityOption(id: 'LOSSLESS', label: 'FLAC Lossless', description: '16-bit / 44.1kHz'),
+      QualityOption(id: 'HI_RES', label: 'Hi-Res FLAC', description: '24-bit / up to 96kHz'),
+      QualityOption(id: 'HI_RES_LOSSLESS', label: 'Hi-Res FLAC Max', description: '24-bit / up to 192kHz'),
+    ],
+  ),
+];
+
+/// A reusable widget for selecting download service (built-in + extensions)
+class DownloadServicePicker extends ConsumerStatefulWidget {
+  final String? trackName;
+  final String? artistName;
+  final String? coverUrl;
+  final void Function(String quality, String service) onSelect;
+
+  const DownloadServicePicker({
+    super.key,
+    this.trackName,
+    this.artistName,
+    this.coverUrl,
+    required this.onSelect,
+  });
+
+  @override
+  ConsumerState<DownloadServicePicker> createState() => _DownloadServicePickerState();
+
+  /// Show the download service picker as a modal bottom sheet
+  static void show(
+    BuildContext context, {
+    String? trackName,
+    String? artistName,
+    String? coverUrl,
+    required void Function(String quality, String service) onSelect,
+  }) {
+    final colorScheme = Theme.of(context).colorScheme;
+    
+    showModalBottomSheet(
+      context: context,
+      backgroundColor: colorScheme.surfaceContainerHigh,
+      shape: const RoundedRectangleBorder(
+        borderRadius: BorderRadius.vertical(top: Radius.circular(28)),
+      ),
+      isScrollControlled: true,
+      builder: (context) => DownloadServicePicker(
+        trackName: trackName,
+        artistName: artistName,
+        coverUrl: coverUrl,
+        onSelect: onSelect,
+      ),
+    );
+  }
+}
+
+class _DownloadServicePickerState extends ConsumerState<DownloadServicePicker> {
+  late String _selectedService;
+
+  @override
+  void initState() {
+    super.initState();
+    _selectedService = ref.read(settingsProvider).defaultService;
+  }
+
+  /// Get quality options for the selected service
+  List<QualityOption> _getQualityOptions() {
+    // Check if it's a built-in service
+    final builtIn = _builtInServices.where((s) => s.id == _selectedService).firstOrNull;
+    if (builtIn != null) {
+      return builtIn.qualityOptions;
+    }
+
+    // Check if it's an extension
+    final extensionState = ref.read(extensionProvider);
+    final ext = extensionState.extensions.where((e) => e.id == _selectedService).firstOrNull;
+    if (ext != null && ext.qualityOptions.isNotEmpty) {
+      return ext.qualityOptions;
+    }
+
+    // Default quality options if extension doesn't specify any
+    return const [
+      QualityOption(id: 'DEFAULT', label: 'Default Quality', description: 'Best available'),
+    ];
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final extensionState = ref.watch(extensionProvider);
+    
+    // Get enabled download provider extensions
+    final downloadExtensions = extensionState.extensions
+        .where((ext) => ext.enabled && ext.hasDownloadProvider)
+        .toList();
+
+    final qualityOptions = _getQualityOptions();
+
+    return SafeArea(
+      child: SingleChildScrollView(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            // Track info header (if provided)
+            if (widget.trackName != null) ...[
+              _TrackInfoHeader(
+                trackName: widget.trackName!,
+                artistName: widget.artistName,
+                coverUrl: widget.coverUrl,
+              ),
+              Divider(height: 1, color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+            ] else ...[
+              const SizedBox(height: 8),
+              Center(
+                child: Container(
+                  width: 40,
+                  height: 4,
+                  decoration: BoxDecoration(
+                    color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4),
+                    borderRadius: BorderRadius.circular(2),
+                  ),
+                ),
+              ),
+            ],
+
+            // Service selector section
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
+              child: Text(
+                'Download From',
+                style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
+              ),
+            ),
+
+            // Built-in services
+            Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 20),
+              child: Wrap(
+                spacing: 8,
+                runSpacing: 8,
+                children: [
+                  // Built-in services
+                  for (final service in _builtInServices)
+                    _ServiceChip(
+                      label: service.label,
+                      isSelected: _selectedService == service.id,
+                      onTap: () => setState(() => _selectedService = service.id),
+                    ),
+                  // Extension services
+                  for (final ext in downloadExtensions)
+                    _ServiceChip(
+                      label: ext.displayName,
+                      isSelected: _selectedService == ext.id,
+                      onTap: () => setState(() => _selectedService = ext.id),
+                      iconPath: ext.iconPath,
+                    ),
+                ],
+              ),
+            ),
+
+            // Quality selector section
+            Padding(
+              padding: const EdgeInsets.fromLTRB(24, 16, 24, 8),
+              child: Text(
+                'Select Quality',
+                style: Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
+              ),
+            ),
+
+            // Disclaimer for built-in services
+            if (_builtInServices.any((s) => s.id == _selectedService))
+              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,
+                  ),
+                ),
+              ),
+
+            // Quality options
+            for (final quality in qualityOptions)
+              _QualityOption(
+                title: quality.label,
+                subtitle: quality.description ?? '',
+                icon: _getQualityIcon(quality.id),
+                onTap: () {
+                  Navigator.pop(context);
+                  widget.onSelect(quality.id, _selectedService);
+                },
+              ),
+
+            const SizedBox(height: 16),
+          ],
+        ),
+      ),
+    );
+  }
+
+  IconData _getQualityIcon(String qualityId) {
+    switch (qualityId.toUpperCase()) {
+      case 'HI_RES_LOSSLESS':
+        return Icons.four_k;
+      case 'HI_RES':
+        return Icons.high_quality;
+      case 'LOSSLESS':
+        return Icons.music_note;
+      case 'MP3_320':
+      case 'MP3':
+        return Icons.audiotrack;
+      case 'OPUS':
+      case 'OPUS_128':
+        return Icons.graphic_eq;
+      default:
+        return Icons.music_note;
+    }
+  }
+}
+
+
+class _QualityOption extends StatelessWidget {
+  final String title;
+  final String subtitle;
+  final IconData icon;
+  final VoidCallback onTap;
+
+  const _QualityOption({
+    required this.title,
+    required this.subtitle,
+    required this.icon,
+    required this.onTap,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return ListTile(
+      contentPadding: const EdgeInsets.symmetric(horizontal: 24, vertical: 4),
+      leading: Container(
+        padding: const EdgeInsets.all(10),
+        decoration: BoxDecoration(
+          color: colorScheme.primaryContainer,
+          borderRadius: BorderRadius.circular(12),
+        ),
+        child: Icon(icon, color: colorScheme.onPrimaryContainer, size: 20),
+      ),
+      title: Text(title, style: const TextStyle(fontWeight: FontWeight.w500)),
+      subtitle: subtitle.isNotEmpty
+          ? Text(subtitle, style: TextStyle(color: colorScheme.onSurfaceVariant))
+          : null,
+      onTap: onTap,
+    );
+  }
+}
+
+class _ServiceChip extends StatelessWidget {
+  final String label;
+  final bool isSelected;
+  final VoidCallback onTap;
+  final String? iconPath;
+
+  const _ServiceChip({
+    required this.label,
+    required this.isSelected,
+    required this.onTap,
+    this.iconPath,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return GestureDetector(
+      onTap: onTap,
+      child: AnimatedContainer(
+        duration: const Duration(milliseconds: 200),
+        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
+        decoration: BoxDecoration(
+          color: isSelected ? colorScheme.primaryContainer : colorScheme.surfaceContainerHighest,
+          borderRadius: BorderRadius.circular(12),
+          border: isSelected ? null : Border.all(color: colorScheme.outlineVariant.withValues(alpha: 0.5)),
+        ),
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            if (iconPath != null) ...[
+              ClipRRect(
+                borderRadius: BorderRadius.circular(4),
+                child: Image.file(
+                  File(iconPath!),
+                  width: 18,
+                  height: 18,
+                  fit: BoxFit.cover,
+                  errorBuilder: (context, error, stackTrace) => Icon(
+                    Icons.extension,
+                    size: 18,
+                    color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
+                  ),
+                ),
+              ),
+              const SizedBox(width: 6),
+            ],
+            Text(
+              label,
+              style: TextStyle(
+                fontWeight: isSelected ? FontWeight.w600 : FontWeight.normal,
+                color: isSelected ? colorScheme.onPrimaryContainer : colorScheme.onSurfaceVariant,
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _TrackInfoHeader extends StatefulWidget {
+  final String trackName;
+  final String? artistName;
+  final String? coverUrl;
+
+  const _TrackInfoHeader({
+    required this.trackName,
+    this.artistName,
+    this.coverUrl,
+  });
+
+  @override
+  State<_TrackInfoHeader> createState() => _TrackInfoHeaderState();
+}
+
+class _TrackInfoHeaderState extends State<_TrackInfoHeader> {
+  bool _expanded = false;
+  bool _isOverflowing = false;
+
+  @override
+  Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return Material(
+      color: Colors.transparent,
+      child: InkWell(
+        onTap: _isOverflowing ? () => setState(() => _expanded = !_expanded) : null,
+        borderRadius: const BorderRadius.only(
+          topLeft: Radius.circular(28),
+          topRight: Radius.circular(28),
+        ),
+        child: Column(
+          children: [
+            const SizedBox(height: 8),
+            Container(
+              width: 40,
+              height: 4,
+              decoration: BoxDecoration(
+                color: colorScheme.onSurfaceVariant.withValues(alpha: 0.4),
+                borderRadius: BorderRadius.circular(2),
+              ),
+            ),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
+              child: Row(
+                children: [
+                  ClipRRect(
+                    borderRadius: BorderRadius.circular(8),
+                    child: widget.coverUrl != null
+                        ? Image.network(
+                            widget.coverUrl!,
+                            width: 56,
+                            height: 56,
+                            fit: BoxFit.cover,
+                            errorBuilder: (context, error, stackTrace) => Container(
+                              width: 56,
+                              height: 56,
+                              color: colorScheme.surfaceContainerHighest,
+                              child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant),
+                            ),
+                          )
+                        : Container(
+                            width: 56,
+                            height: 56,
+                            color: colorScheme.surfaceContainerHighest,
+                            child: Icon(Icons.music_note, color: colorScheme.onSurfaceVariant),
+                          ),
+                  ),
+                  const SizedBox(width: 12),
+                  Expanded(
+                    child: LayoutBuilder(
+                      builder: (context, constraints) {
+                        final titleStyle = Theme.of(context).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w600);
+                        final titleSpan = TextSpan(text: widget.trackName, style: titleStyle);
+                        final titlePainter = TextPainter(
+                          text: titleSpan,
+                          maxLines: 1,
+                          textDirection: TextDirection.ltr,
+                        )..layout(maxWidth: constraints.maxWidth);
+                        final titleOverflows = titlePainter.didExceedMaxLines;
+
+                        WidgetsBinding.instance.addPostFrameCallback((_) {
+                          if (mounted && _isOverflowing != titleOverflows) {
+                            setState(() => _isOverflowing = titleOverflows);
+                          }
+                        });
+
+                        return Column(
+                          crossAxisAlignment: CrossAxisAlignment.start,
+                          children: [
+                            Text(
+                              widget.trackName,
+                              style: titleStyle,
+                              maxLines: _expanded ? 10 : 1,
+                              overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
+                            ),
+                            if (widget.artistName != null) ...[
+                              const SizedBox(height: 2),
+                              Text(
+                                widget.artistName!,
+                                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                                  color: colorScheme.onSurfaceVariant,
+                                ),
+                                maxLines: _expanded ? 3 : 1,
+                                overflow: _expanded ? TextOverflow.visible : TextOverflow.ellipsis,
+                              ),
+                            ],
+                          ],
+                        );
+                      },
+                    ),
+                  ),
+                  if (_isOverflowing || _expanded)
+                    Icon(
+                      _expanded ? Icons.expand_less : Icons.expand_more,
+                      color: colorScheme.onSurfaceVariant,
+                      size: 20,
+                    ),
+                ],
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/widgets/settings_group.dart

@@ -72,7 +72,7 @@ class SettingsItem extends StatelessWidget {
         InkWell(
           onTap: onTap,
           splashColor: colorScheme.primary.withValues(alpha: 0.12),
-          highlightColor: colorScheme.primary.withValues(alpha: 0.08),
+          highlightColor: Colors.transparent,
           child: Padding(
             padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 16),
             child: Row(
@@ -133,6 +133,7 @@ class SettingsSwitchItem extends StatelessWidget {
   final bool value;
   final ValueChanged<bool>? onChanged;
   final bool showDivider;
+  final bool enabled;
 
   const SettingsSwitchItem({
     super.key,
@@ -142,53 +143,60 @@ class SettingsSwitchItem extends StatelessWidget {
     required this.value,
     this.onChanged,
     this.showDivider = true,
+    this.enabled = true,
   });
 
   @override
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
+    final isDisabled = !enabled || onChanged == null;
     
     return Column(
       mainAxisSize: MainAxisSize.min,
       children: [
-        InkWell(
-          onTap: onChanged != null ? () => onChanged!(!value) : null,
-          splashColor: colorScheme.primary.withValues(alpha: 0.12),
-          highlightColor: colorScheme.primary.withValues(alpha: 0.08),
-          child: Padding(
-            padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
-            child: Row(
-              children: [
-                if (icon != null) ...[
-                  Icon(icon, color: colorScheme.onSurfaceVariant, size: 24),
-                  const SizedBox(width: 16),
-                ],
-                Expanded(
-                  child: Column(
-                    crossAxisAlignment: CrossAxisAlignment.start,
-                    children: [
-                      Text(
-                        title,
-                        style: Theme.of(context).textTheme.bodyLarge,
-                      ),
-                      if (subtitle != null) ...[
-                        const SizedBox(height: 2),
+        Opacity(
+          opacity: isDisabled ? 0.5 : 1.0,
+          child: InkWell(
+            onTap: isDisabled ? null : () => onChanged!(!value),
+            splashColor: colorScheme.primary.withValues(alpha: 0.12),
+            highlightColor: Colors.transparent,
+            child: Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
+              child: Row(
+                children: [
+                  if (icon != null) ...[
+                    Icon(icon, color: isDisabled ? colorScheme.outline : colorScheme.onSurfaceVariant, size: 24),
+                    const SizedBox(width: 16),
+                  ],
+                  Expanded(
+                    child: Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: [
                         Text(
-                          subtitle!,
-                          style: Theme.of(context).textTheme.bodyMedium?.copyWith(
-                            color: colorScheme.onSurfaceVariant,
+                          title,
+                          style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                            color: isDisabled ? colorScheme.outline : null,
                           ),
                         ),
+                        if (subtitle != null) ...[
+                          const SizedBox(height: 2),
+                          Text(
+                            subtitle!,
+                            style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                              color: isDisabled ? colorScheme.outline : colorScheme.onSurfaceVariant,
+                            ),
+                          ),
+                        ],
                       ],
-                    ],
+                    ),
                   ),
-                ),
-                const SizedBox(width: 8),
-                Switch(
-                  value: value,
-                  onChanged: onChanged,
-                ),
-              ],
+                  const SizedBox(width: 8),
+                  Switch(
+                    value: value,
+                    onChanged: isDisabled ? null : onChanged,
+                  ),
+                ],
+              ),
             ),
           ),
         ),