fix(favorite): 统一收藏状态与互动图标

test/library/favorite_controller_test.dart

@@ -6,11 +6,12 @@ import 'package:fruitshorts/core/data/models/page_result.dart';
 import 'package:fruitshorts/core/data/repositories/favorite_repository.dart';
 import 'package:fruitshorts/core/data/services/favorite_controller.dart';
 
-Drama _card(String id) => Drama(
+Drama _card(String id, {int? favoriteCount}) => Drama(
   id: id,
   title: 'Drama $id',
   synopsis: 'synopsis',
   posterUrl: '/files/$id.png',
+  favoriteCount: favoriteCount,
 );
 
 void main() {
@@ -37,6 +38,31 @@ void main() {
     expect(controller.cards.map((drama) => drama.id), ['signal']);
   });
 
+  test(
+    'should_adjust_the_single_favorite_count_when_toggle_succeeds',
+    () async {
+      final controller = FavoriteController(InMemoryFavoriteRepository());
+      final card = _card('signal', favoriteCount: 12);
+
+      expect(controller.favoriteCountFor(card), 12);
+      expect(await controller.toggle('signal', card: card), isTrue);
+      expect(controller.favoriteCount('signal'), 13);
+      expect(await controller.toggle('signal', card: card), isTrue);
+      expect(controller.favoriteCount('signal'), 12);
+    },
+  );
+
+  test('should_apply_server_count_and_roll_back_toggle_failure', () async {
+    final repository = InMemoryFavoriteRepository()..failToggle = true;
+    final controller = FavoriteController(repository);
+
+    controller.applyServerState('signal', saved: false, favoriteCount: 20);
+    expect(controller.favoriteCount('signal'), 20);
+    expect(await controller.toggle('signal'), isFalse);
+    expect(controller.isSaved('signal'), isFalse);
+    expect(controller.favoriteCount('signal'), 20);
+  });
+
   test('should_remove_card_and_state_when_toggled_off', () async {
     final repository = InMemoryFavoriteRepository(saved: {'signal'});
     final controller = FavoriteController(repository);