feat(flutter): 接入分类记录收藏与下载授权

test/library/favorite_controller_test.dart

@@ -77,18 +77,33 @@ void main() {
     final repository = InMemoryFavoriteRepository(
       saved: {'signal'},
       cards: [_card('signal')],
-    );
+    )..failRemove = true;
     final controller = FavoriteController(repository);
     await controller.load();
 
     final ok = await controller.remove('signal');
 
-    // InMemory 实现的 remove 不会失败，这里断言正常路径：状态与列表一起清掉
-    expect(ok, isTrue);
-    expect(controller.isSaved('signal'), isFalse);
-    expect(controller.cards, isEmpty);
+    expect(ok, isFalse);
+    expect(controller.isSaved('signal'), isTrue);
+    expect(controller.cards.map((drama) => drama.id), ['signal']);
   });
 
+  test(
+    'should_restore_removed_card_at_original_position_when_remove_fails',
+    () async {
+      final repository = InMemoryFavoriteRepository(
+        saved: {'signal', 'city'},
+        cards: [_card('signal'), _card('city')],
+      )..failRemove = true;
+      final controller = FavoriteController(repository);
+      await controller.load();
+
+      await controller.remove('signal');
+
+      expect(controller.cards.map((drama) => drama.id), ['signal', 'city']);
+    },
+  );
+
   test('should_clear_state_when_signing_out', () async {
     final controller = FavoriteController(
       InMemoryFavoriteRepository(saved: {'signal'}, cards: [_card('signal')]),