fix(runtime): harden application service boundaries

lib/services/jellyfin_client/parts/playlists.dart

@@ -42,49 +42,44 @@ mixin _JellyfinPlaylistMethods on MediaServerCacheMixin {
     final offset = start ?? 0;
     final pageSize = size ?? _playlistsPageSize;
     final requestedType = playlistType.toLowerCase();
-    final items = <MediaPlaylist>[];
-    var rawOffset = 0;
-    var filteredSeen = 0;
-    int? rawTotal;
-    var rawFinished = false;
-
-    while (items.length < pageSize && !rawFinished) {
-      final response = await _http.get(
-        '/Items',
-        queryParameters: {
-          'userId': connection.userId,
-          'IncludeItemTypes': 'Playlist',
-          'Recursive': 'true',
-          'StartIndex': rawOffset.toString(),
-          'Limit': pageSize.toString(),
-          'Fields': 'Overview,DateCreated,DateLastSaved,ChildCount,Tags',
-          ...jellyfinImageQueryParameters,
-        },
-        abort: abort,
-      );
-      throwIfHttpError(response);
-      final rawItems = _itemsArray(response.data);
-      final rawTotalValue = response.data is Map<String, dynamic>
-          ? (response.data as Map<String, dynamic>)['TotalRecordCount']
-          : null;
-      if (rawTotalValue is int) rawTotal = rawTotalValue;
-
-      for (final item in rawItems.map(_playlistFromJson)) {
-        if (!_matchesPlaylistFilters(item, requestedType: requestedType, smart: smart)) continue;
-        if (filteredSeen >= offset && items.length < pageSize) {
-          items.add(item);
-        }
-        filteredSeen++;
-      }
-
-      rawOffset += rawItems.length;
-      rawFinished = rawItems.isEmpty || rawItems.length < pageSize || (rawTotal != null && rawOffset >= rawTotal);
+    final mediaType = switch (requestedType) {
+      '' => null,
+      'video' => 'Video',
+      'audio' => 'Audio',
+      'photo' => 'Photo',
+      'book' => 'Book',
+      'unknown' => 'Unknown',
+      _ => '',
+    };
+    if (mediaType == '') {
+      return LibraryPage<MediaPlaylist>(items: const [], totalCount: 0, offset: offset);
     }
 
-    final fallbackTotal = rawFinished
-        ? filteredSeen
-        : fallbackPageTotal(offset: offset, itemCount: items.length, requestedSize: pageSize);
-    return LibraryPage<MediaPlaylist>(items: items, totalCount: fallbackTotal, offset: offset);
+    final response = await _http.get(
+      '/Items',
+      queryParameters: {
+        'userId': connection.userId,
+        'IncludeItemTypes': 'Playlist',
+        'Recursive': 'true',
+        'MediaTypes': ?mediaType,
+        'StartIndex': offset.toString(),
+        'Limit': pageSize.toString(),
+        'Fields': 'Overview,DateCreated,DateLastSaved,ChildCount,Tags',
+        ...jellyfinImageQueryParameters,
+      },
+      abort: abort,
+    );
+    throwIfHttpError(response);
+    final items = _itemsArray(response.data).map(_playlistFromJson).toList();
+    final rawTotal = response.data is Map<String, dynamic>
+        ? (response.data as Map<String, dynamic>)['TotalRecordCount']
+        : null;
+    final fallbackTotal = fallbackPageTotal(offset: offset, itemCount: items.length, requestedSize: pageSize);
+    return LibraryPage<MediaPlaylist>(
+      items: items,
+      totalCount: rawTotal is int ? rawTotal : fallbackTotal,
+      offset: offset,
+    );
   }
 
   @override
@@ -201,7 +196,7 @@ mixin _JellyfinPlaylistMethods on MediaServerCacheMixin {
       return false;
     }
     if (item.playlistItemId == null) {
-      appLogger.e('movePlaylistItem: item ${item.id} ("${item.title}") has no playlistItemId');
+      appLogger.e('Jellyfin movePlaylistItem failed: missing playlist entry ID');
       return false;
     }
     final response = await _http.post(
@@ -218,7 +213,7 @@ mixin _JellyfinPlaylistMethods on MediaServerCacheMixin {
       return false;
     }
     if (item.playlistItemId == null) {
-      appLogger.e('removeFromPlaylist: item ${item.id} ("${item.title}") has no playlistItemId');
+      appLogger.e('Jellyfin removeFromPlaylist failed: missing playlist entry ID');
       return false;
     }
     final response = await _http.delete(
@@ -253,12 +248,6 @@ mixin _JellyfinPlaylistMethods on MediaServerCacheMixin {
     return 'video';
   }
 
-  bool _matchesPlaylistFilters(MediaPlaylist playlist, {required String requestedType, required bool? smart}) {
-    if (requestedType.isNotEmpty && playlist.playlistType.toLowerCase() != requestedType) return false;
-    if (smart != null && playlist.smart != smart) return false;
-    return true;
-  }
-
   String? _imageTagPath(String id, Object? tags) {
     if (tags is! Map<String, dynamic>) return null;
     final tag = tags['Primary'];