Replace podcast popup menu with a full action sheet

lib/models/podcast.dart

@@ -16,6 +16,10 @@ class Podcast {
   final String lastPlayedAt;
   final PodcastState state;
 
+  /// Whether the current user has favorited this podcast. Mutable so
+  /// the optimistic favorite toggle can flip it in place.
+  bool favorite;
+
   ImageProvider? _image;
 
   Podcast({
@@ -29,6 +33,7 @@ class Podcast {
     required this.subscribedAt,
     required this.lastPlayedAt,
     required this.state,
+    this.favorite = false,
   });
 
   ImageProvider get image {
@@ -40,6 +45,8 @@ class Podcast {
     String? id,
     String? title,
     String? author,
+    bool favorite = false,
+    PodcastState? state,
   }) {
     final faker = Faker();
     return Podcast(
@@ -52,7 +59,8 @@ class Podcast {
       imageUrl: faker.image.loremPicsum(width: 192, height: 192),
       subscribedAt: '2026-01-01T00:00:00Z',
       lastPlayedAt: '2026-01-01T00:00:00Z',
-      state: PodcastState(progresses: {}),
+      state: state ?? PodcastState(progresses: {}),
+      favorite: favorite,
     );
   }
 
@@ -68,6 +76,7 @@ class Podcast {
       subscribedAt: json['subscribed_at'],
       lastPlayedAt: json['last_played_at'],
       state: PodcastState.fromJson(json['state']),
+      favorite: json['favorite'] == true,
     );
   }
 

lib/providers/playable_provider.dart

@@ -134,10 +134,17 @@ class PlayableProvider with ChangeNotifier, StreamSubscriber {
   }) async {
     if (forceRefresh) AppState.delete(['podcast.episodes', podcastId]);
 
-    return _stateAwareFetch(
+    final episodes = await _stateAwareFetch(
       'podcasts/$podcastId/episodes${getUpdates ? '?refresh=1' : ''}',
       ['podcast.episodes', podcastId],
     );
+
+    // A forced refresh repopulates the cache with fresh data — let any
+    // screen rendering the episode list (e.g. PodcastDetailsScreen)
+    // know it should rebuild.
+    if (forceRefresh) notifyListeners();
+
+    return episodes;
   }
 
   Future<List<Playable>> _stateAwareFetch(String url, Object cacheKey) async {

lib/providers/podcast_provider.dart

@@ -36,6 +36,23 @@ class PodcastProvider with ChangeNotifier, StreamSubscriber {
     return fetchAll();
   }
 
+  Future<void> toggleFavorite(Podcast podcast) async {
+    // Optimistic flip + restore on failure.
+    podcast.favorite = !podcast.favorite;
+    notifyListeners();
+
+    try {
+      await post('favorites/toggle', data: {
+        'type': 'podcast',
+        'id': podcast.id,
+      });
+    } catch (_) {
+      podcast.favorite = !podcast.favorite;
+      notifyListeners();
+      rethrow;
+    }
+  }
+
   Future<void> unsubscribePodcast(Podcast podcast) async {
     // Optimistic removal so a Dismissible's onDismissed callback can
     // call this without leaving the dismissed widget in the tree