feat: add home feed provider setting, fix Qobuz cover URL propagation

- Add homeFeedProvider field to AppSettings with picker UI in extensions page
- Update explore_provider to respect user's home feed provider preference
- Add normalizeCoverReference() and normalizeRemoteHttpUrl() to filter
  invalid cover URLs (no scheme, no host, protocol-relative)
- Apply cover URL normalization across all screens and providers to
  prevent 'no host specified in URI' errors from Qobuz
- Propagate CoverURL from QobuzDownloadResult through Go backend so
  cover art is available even when request metadata is incomplete

lib/providers/download_queue_provider.dart

@@ -122,7 +122,7 @@ class DownloadHistoryItem {
         artistName: json['artistName'] as String,
         albumName: json['albumName'] as String,
         albumArtist: normalizeOptionalString(json['albumArtist'] as String?),
-        coverUrl: json['coverUrl'] as String?,
+        coverUrl: normalizeCoverReference(json['coverUrl']?.toString()),
         filePath: json['filePath'] as String,
         storageMode: json['storageMode'] as String?,
         downloadTreeUri: json['downloadTreeUri'] as String?,
@@ -176,7 +176,7 @@ class DownloadHistoryItem {
       artistName: artistName ?? this.artistName,
       albumName: albumName ?? this.albumName,
       albumArtist: albumArtist ?? this.albumArtist,
-      coverUrl: coverUrl ?? this.coverUrl,
+      coverUrl: normalizeCoverReference(coverUrl ?? this.coverUrl),
       filePath: filePath ?? this.filePath,
       storageMode: storageMode ?? this.storageMode,
       downloadTreeUri: downloadTreeUri ?? this.downloadTreeUri,
@@ -2534,8 +2534,8 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
     final backendIsrc = normalizeOptionalString(
       backendResult['isrc'] as String?,
     );
-    final backendCoverUrl = normalizeOptionalString(
-      backendResult['cover_url'] as String?,
+    final backendCoverUrl = normalizeCoverReference(
+      backendResult['cover_url']?.toString(),
     );
     final backendAlbumArtist = normalizeOptionalString(
       backendResult['album_artist'] as String?,
@@ -2591,7 +2591,7 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
     }
 
     String? coverPath;
-    var coverUrl = track.coverUrl;
+    var coverUrl = normalizeRemoteHttpUrl(track.coverUrl);
     if (coverUrl != null && coverUrl.isNotEmpty) {
       try {
         if (settings.maxQualityCover) {
@@ -2777,7 +2777,7 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
     }
 
     String? coverPath;
-    var coverUrl = track.coverUrl;
+    var coverUrl = normalizeRemoteHttpUrl(track.coverUrl);
     if (coverUrl != null && coverUrl.isNotEmpty) {
       try {
         if (settings.maxQualityCover) {
@@ -2945,7 +2945,7 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
     }
 
     String? coverPath;
-    var coverUrl = track.coverUrl;
+    var coverUrl = normalizeRemoteHttpUrl(track.coverUrl);
     if (coverUrl != null && coverUrl.isNotEmpty) {
       try {
         if (settings.maxQualityCover) {
@@ -3751,7 +3751,7 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
                 albumArtist: trackToDownload.albumArtist,
                 artistId: trackToDownload.artistId,
                 albumId: trackToDownload.albumId,
-                coverUrl: trackToDownload.coverUrl,
+                coverUrl: normalizeCoverReference(trackToDownload.coverUrl),
                 duration: trackToDownload.duration,
                 isrc: (deezerIsrc != null && _isValidISRC(deezerIsrc))
                     ? deezerIsrc
@@ -4041,6 +4041,14 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
             item.service.toLowerCase();
         final decryptionKey =
             (result['decryption_key'] as String?)?.trim() ?? '';
+        trackToDownload = _buildTrackForMetadataEmbedding(
+          trackToDownload,
+          result,
+          resolvedAlbumArtist,
+        );
+        _log.d(
+          'Track coverUrl after download result: ${trackToDownload.coverUrl}',
+        );
 
         if (!wasExisting && decryptionKey.isNotEmpty && filePath != null) {
           _log.i('Encrypted stream detected, decrypting via FFmpeg...');
@@ -4959,7 +4967,7 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
                       ? backendAlbum
                       : trackToDownload.albumName,
                   albumArtist: historyAlbumArtist,
-                  coverUrl: trackToDownload.coverUrl,
+                  coverUrl: normalizeCoverReference(trackToDownload.coverUrl),
                   filePath: filePath,
                   storageMode: effectiveSafMode ? 'saf' : 'app',
                   downloadTreeUri: effectiveSafMode

lib/providers/explore_provider.dart

@@ -4,6 +4,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
 import 'package:spotiflac_android/utils/logger.dart';
 import 'package:spotiflac_android/providers/extension_provider.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
 
 final _log = AppLogger('ExploreProvider');
 
@@ -202,9 +203,7 @@ class ExploreNotifier extends Notifier<ExploreState> {
   Future<void> _saveToCache(List<ExploreSection> sections) async {
     try {
       final prefs = await SharedPreferences.getInstance();
-      final data = {
-        'sections': sections.map((s) => s.toJson()).toList(),
-      };
+      final data = {'sections': sections.map((s) => s.toJson()).toList()};
       await prefs.setString(_cacheKey, jsonEncode(data));
       await prefs.setInt(_cacheTsKey, DateTime.now().millisecondsSinceEpoch);
       _log.d('Saved ${sections.length} explore sections to cache');
@@ -216,16 +215,16 @@ class ExploreNotifier extends Notifier<ExploreState> {
   /// Fetch home feed from spotify-web extension
   Future<void> fetchHomeFeed({bool forceRefresh = false}) async {
     _log.i('fetchHomeFeed called, forceRefresh=$forceRefresh');
-    
+
     // If we have cached content and it's fresh enough, skip network fetch
-    if (!forceRefresh && 
-        state.hasContent && 
+    if (!forceRefresh &&
+        state.hasContent &&
         state.lastFetched != null &&
         DateTime.now().difference(state.lastFetched!).inMinutes < 5) {
       _log.d('Using cached home feed (fresh enough)');
       return;
     }
-    
+
     if (state.isLoading) {
       _log.d('Home feed fetch already in progress');
       return;
@@ -237,21 +236,33 @@ class ExploreNotifier extends Notifier<ExploreState> {
 
     try {
       final extState = ref.read(extensionProvider);
-      _log.d('Extensions count: ${extState.extensions.length}');
-      
+      final settings = ref.read(settingsProvider);
+      final preferredId = settings.homeFeedProvider;
+      _log.d(
+        'Extensions count: ${extState.extensions.length}, preferred home feed: $preferredId',
+      );
+
       Extension? targetExt;
       for (final extension in extState.extensions) {
         if (!extension.enabled || !extension.hasHomeFeed) {
           continue;
         }
+        // If user has a preference, use that
+        if (preferredId != null &&
+            preferredId.isNotEmpty &&
+            extension.id == preferredId) {
+          targetExt = extension;
+          break;
+        }
+        // Otherwise take the first available (fallback to spotify-web if found)
         if (targetExt == null || extension.id == 'spotify-web') {
           targetExt = extension;
-          if (extension.id == 'spotify-web') {
+          if (preferredId == null && extension.id == 'spotify-web') {
             break;
           }
         }
       }
-      
+
       if (targetExt == null) {
         _log.w('No extension with homeFeed capability found');
         state = state.copyWith(
@@ -260,7 +271,7 @@ class ExploreNotifier extends Notifier<ExploreState> {
         );
         return;
       }
-      
+
       _log.i('Fetching home feed from ${targetExt.id}...');
       final result = await PlatformBridge.getExtensionHomeFeed(targetExt.id);
 
@@ -276,10 +287,7 @@ class ExploreNotifier extends Notifier<ExploreState> {
       _log.d('getExtensionHomeFeed success=$success');
       if (!success) {
         final error = result['error'] as String? ?? 'Unknown error';
-        state = state.copyWith(
-          isLoading: false,
-          error: error,
-        );
+        state = state.copyWith(isLoading: false, error: error);
         return;
       }
 
@@ -291,10 +299,12 @@ class ExploreNotifier extends Notifier<ExploreState> {
           .toList();
 
       _log.i('Fetched ${sections.length} sections');
-      
+
       if (sections.isNotEmpty && sections.first.items.isNotEmpty) {
         final firstItem = sections.first.items.first;
-        _log.d('First item: name=${firstItem.name}, artists=${firstItem.artists}, type=${firstItem.type}');
+        _log.d(
+          'First item: name=${firstItem.name}, artists=${firstItem.artists}, type=${firstItem.type}',
+        );
       }
 
       final localGreeting = _getLocalGreeting();
@@ -311,10 +321,7 @@ class ExploreNotifier extends Notifier<ExploreState> {
       _saveToCache(sections);
     } catch (e, stack) {
       _log.e('Error fetching home feed: $e', e, stack);
-      state = state.copyWith(
-        isLoading: false,
-        error: e.toString(),
-      );
+      state = state.copyWith(isLoading: false, error: e.toString());
     }
   }
 
@@ -325,7 +332,6 @@ class ExploreNotifier extends Notifier<ExploreState> {
   Future<void> refresh() => fetchHomeFeed(forceRefresh: true);
 }
 
-
 final exploreProvider = NotifierProvider<ExploreNotifier, ExploreState>(() {
   return ExploreNotifier();
 });

lib/providers/settings_provider.dart

@@ -424,6 +424,15 @@ class SettingsNotifier extends Notifier<AppSettings> {
     _saveSettings();
   }
 
+  void setHomeFeedProvider(String? provider) {
+    if (provider == null || provider.isEmpty) {
+      state = state.copyWith(clearHomeFeedProvider: true);
+    } else {
+      state = state.copyWith(homeFeedProvider: provider);
+    }
+    _saveSettings();
+  }
+
   void setEnableLogging(bool enabled) {
     state = state.copyWith(enableLogging: enabled);
     _saveSettings();

lib/providers/track_provider.dart

@@ -2,6 +2,7 @@ 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/utils/string_utils.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
 import 'package:spotiflac_android/providers/extension_provider.dart';
 
@@ -286,7 +287,9 @@ class TrackNotifier extends Notifier<TrackState> {
               playlistName: type == 'playlist'
                   ? result['name'] as String?
                   : null,
-              coverUrl: result['cover_url'] as String?,
+              coverUrl: normalizeCoverReference(
+                result['cover_url']?.toString(),
+              ),
               searchExtensionId: extensionId,
             );
             return;
@@ -313,10 +316,12 @@ class TrackNotifier extends Notifier<TrackState> {
               isLoading: false,
               artistId: artistData['id'] as String?,
               artistName: artistData['name'] as String?,
-              coverUrl:
-                  artistData['image_url'] as String? ??
-                  artistData['images'] as String?,
-              headerImageUrl: artistData['header_image'] as String?,
+              coverUrl: normalizeRemoteHttpUrl(
+                (artistData['image_url'] ?? artistData['images'])?.toString(),
+              ),
+              headerImageUrl: normalizeRemoteHttpUrl(
+                artistData['header_image']?.toString(),
+              ),
               monthlyListeners: artistData['listeners'] as int?,
               artistAlbums: albums,
               artistTopTracks: topTracks.isNotEmpty ? topTracks : null,
@@ -357,7 +362,7 @@ class TrackNotifier extends Notifier<TrackState> {
             isLoading: false,
             albumId: id,
             albumName: albumInfo['name'] as String?,
-            coverUrl: albumInfo['images'] as String?,
+            coverUrl: normalizeRemoteHttpUrl(albumInfo['images']?.toString()),
           );
           _preWarmCacheForTracks(tracks);
         } else if (type == 'playlist') {
@@ -371,7 +376,9 @@ class TrackNotifier extends Notifier<TrackState> {
             tracks: tracks,
             isLoading: false,
             playlistName: playlistInfo['name'] as String?,
-            coverUrl: playlistInfo['images'] as String?,
+            coverUrl: normalizeRemoteHttpUrl(
+              playlistInfo['images']?.toString(),
+            ),
           );
           _preWarmCacheForTracks(tracks);
         } else if (type == 'artist') {
@@ -385,7 +392,7 @@ class TrackNotifier extends Notifier<TrackState> {
             isLoading: false,
             artistId: artistInfo['id'] as String?,
             artistName: artistInfo['name'] as String?,
-            coverUrl: artistInfo['images'] as String?,
+            coverUrl: normalizeRemoteHttpUrl(artistInfo['images']?.toString()),
             artistAlbums: albums,
           );
         }
@@ -422,7 +429,7 @@ class TrackNotifier extends Notifier<TrackState> {
             isLoading: false,
             albumId: 'qobuz:$id',
             albumName: albumInfo['name'] as String?,
-            coverUrl: albumInfo['images'] as String?,
+            coverUrl: normalizeRemoteHttpUrl(albumInfo['images']?.toString()),
           );
           _preWarmCacheForTracks(tracks);
         } else if (type == 'playlist') {
@@ -435,8 +442,9 @@ class TrackNotifier extends Notifier<TrackState> {
           final owner = playlistInfo['owner'] as Map<String, dynamic>?;
           final playlistName =
               (playlistInfo['name'] ?? owner?['name']) as String?;
-          final coverUrl =
-              (playlistInfo['images'] ?? owner?['images']) as String?;
+          final coverUrl = normalizeRemoteHttpUrl(
+            (playlistInfo['images'] ?? owner?['images'])?.toString(),
+          );
           state = TrackState(
             tracks: tracks,
             isLoading: false,
@@ -455,7 +463,7 @@ class TrackNotifier extends Notifier<TrackState> {
             isLoading: false,
             artistId: artistInfo['id'] as String?,
             artistName: artistInfo['name'] as String?,
-            coverUrl: artistInfo['images'] as String?,
+            coverUrl: normalizeRemoteHttpUrl(artistInfo['images']?.toString()),
             artistAlbums: albums,
           );
         }
@@ -492,7 +500,7 @@ class TrackNotifier extends Notifier<TrackState> {
             isLoading: false,
             albumId: 'tidal:$id',
             albumName: albumInfo['name'] as String?,
-            coverUrl: albumInfo['images'] as String?,
+            coverUrl: normalizeRemoteHttpUrl(albumInfo['images']?.toString()),
           );
           _preWarmCacheForTracks(tracks);
         } else if (type == 'playlist') {
@@ -505,8 +513,9 @@ class TrackNotifier extends Notifier<TrackState> {
           final owner = playlistInfo['owner'] as Map<String, dynamic>?;
           final playlistName =
               (playlistInfo['name'] ?? owner?['name']) as String?;
-          final coverUrl =
-              (playlistInfo['images'] ?? owner?['images']) as String?;
+          final coverUrl = normalizeRemoteHttpUrl(
+            (playlistInfo['images'] ?? owner?['images'])?.toString(),
+          );
           state = TrackState(
             tracks: tracks,
             isLoading: false,
@@ -525,7 +534,7 @@ class TrackNotifier extends Notifier<TrackState> {
             isLoading: false,
             artistId: artistInfo['id'] as String?,
             artistName: artistInfo['name'] as String?,
-            coverUrl: artistInfo['images'] as String?,
+            coverUrl: normalizeRemoteHttpUrl(artistInfo['images']?.toString()),
             artistAlbums: albums,
           );
         }
@@ -580,7 +589,7 @@ class TrackNotifier extends Notifier<TrackState> {
           isLoading: false,
           albumId: parsed['id'] as String?,
           albumName: albumInfo['name'] as String?,
-          coverUrl: albumInfo['images'] as String?,
+          coverUrl: normalizeRemoteHttpUrl(albumInfo['images']?.toString()),
         );
         _preWarmCacheForTracks(tracks);
       } else if (type == 'playlist') {
@@ -592,8 +601,9 @@ class TrackNotifier extends Notifier<TrackState> {
         final owner = playlistInfo['owner'] as Map<String, dynamic>?;
         final playlistName =
             (playlistInfo['name'] ?? owner?['name']) as String?;
-        final coverUrl =
-            (playlistInfo['images'] ?? owner?['images']) as String?;
+        final coverUrl = normalizeRemoteHttpUrl(
+          (playlistInfo['images'] ?? owner?['images'])?.toString(),
+        );
         state = TrackState(
           tracks: tracks,
           isLoading: false,
@@ -612,7 +622,7 @@ class TrackNotifier extends Notifier<TrackState> {
           isLoading: false,
           artistId: artistInfo['id'] as String?,
           artistName: artistInfo['name'] as String?,
-          coverUrl: artistInfo['images'] as String?,
+          coverUrl: normalizeRemoteHttpUrl(artistInfo['images']?.toString()),
           artistAlbums: albums,
         );
       }
@@ -986,7 +996,7 @@ class TrackNotifier extends Notifier<TrackState> {
       albumArtist: data['album_artist'] as String?,
       artistId: (data['artist_id'] ?? data['artistId'])?.toString(),
       albumId: data['album_id']?.toString(),
-      coverUrl: data['images'] as String?,
+      coverUrl: normalizeCoverReference(data['images']?.toString()),
       isrc: data['isrc'] as String?,
       duration: (durationMs / 1000).round(),
       trackNumber: data['track_number'] as int?,
@@ -1017,7 +1027,9 @@ class TrackNotifier extends Notifier<TrackState> {
       albumArtist: data['album_artist']?.toString(),
       artistId: (data['artist_id'] ?? data['artistId'])?.toString(),
       albumId: data['album_id']?.toString(),
-      coverUrl: (data['cover_url'] ?? data['images'])?.toString(),
+      coverUrl: normalizeCoverReference(
+        (data['cover_url'] ?? data['images'])?.toString(),
+      ),
       isrc: data['isrc']?.toString(),
       duration: (durationMs / 1000).round(),
       trackNumber: data['track_number'] as int?,
@@ -1062,7 +1074,9 @@ class TrackNotifier extends Notifier<TrackState> {
       name: data['name'] as String? ?? '',
       releaseDate: data['release_date'] as String? ?? '',
       totalTracks: data['total_tracks'] as int? ?? 0,
-      coverUrl: (data['cover_url'] ?? data['images'])?.toString(),
+      coverUrl: normalizeCoverReference(
+        (data['cover_url'] ?? data['images'])?.toString(),
+      ),
       albumType: data['album_type'] as String? ?? 'album',
       artists: data['artists'] as String? ?? '',
       providerId: data['provider_id']?.toString(),
@@ -1073,7 +1087,7 @@ class TrackNotifier extends Notifier<TrackState> {
     return SearchArtist(
       id: data['id'] as String? ?? '',
       name: data['name'] as String? ?? '',
-      imageUrl: data['images'] as String?,
+      imageUrl: normalizeRemoteHttpUrl(data['images']?.toString()),
       followers: data['followers'] as int? ?? 0,
       popularity: data['popularity'] as int? ?? 0,
     );
@@ -1084,7 +1098,7 @@ class TrackNotifier extends Notifier<TrackState> {
       id: data['id'] as String? ?? '',
       name: data['name'] as String? ?? '',
       artists: data['artists'] as String? ?? '',
-      imageUrl: data['images'] as String?,
+      imageUrl: normalizeRemoteHttpUrl(data['images']?.toString()),
       releaseDate: data['release_date'] as String?,
       totalTracks: data['total_tracks'] as int? ?? 0,
       albumType: data['album_type'] as String? ?? 'album',
@@ -1096,7 +1110,7 @@ class TrackNotifier extends Notifier<TrackState> {
       id: data['id'] as String? ?? '',
       name: data['name'] as String? ?? '',
       owner: data['owner'] as String? ?? '',
-      imageUrl: data['images'] as String?,
+      imageUrl: normalizeRemoteHttpUrl(data['images']?.toString()),
       totalTracks: data['total_tracks'] as int? ?? 0,
     );
   }