feat(home): 支持滑动切换首页分类

test/home/home_grid_layout_test.dart

@@ -11,6 +11,7 @@ import 'package:fruitshorts/core/data/repositories/catalog_repository.dart';
 import 'package:fruitshorts/core/data/repositories/favorite_repository.dart';
 import 'package:fruitshorts/core/data/repositories/playback_repository.dart';
 import 'package:fruitshorts/core/data/repositories/watch_history_repository.dart';
+import 'package:fruitshorts/core/theme/app_dimens.dart';
 import 'package:fruitshorts/pages/home/widgets/home_feed_card.dart';
 import 'package:fruitshorts/pages/player/player_view.dart';
 import 'package:shared_preferences_platform_interface/in_memory_shared_preferences_async.dart';
@@ -170,6 +171,32 @@ void main() {
     );
   });
 
+  testWidgets('should_swipe_between_primary_sections', (tester) async {
+    final repository = _PagedCatalogRepository();
+    await _pumpApp(tester, repository);
+
+    expect(find.byKey(const Key('home-secondary-tags')), findsOneWidget);
+    await tester.drag(
+      find.byKey(const Key('home-primary-page-view')),
+      const Offset(-320, 0),
+    );
+    await tester.pumpAndSettle();
+
+    expect(find.byKey(const Key('home-secondary-tags')), findsNothing);
+    final selected = tester.widget<AnimatedDefaultTextStyle>(
+      find.byKey(const Key('home-primary-label-newReleases')),
+    );
+    expect(selected.style.fontSize, AppDimens.homePrimaryTabSelectedFont);
+    expect(selected.style.fontWeight, FontWeight.w700);
+
+    await tester.drag(
+      find.byKey(const Key('home-primary-page-view')),
+      const Offset(320, 0),
+    );
+    await tester.pumpAndSettle();
+    expect(find.byKey(const Key('home-secondary-tags')), findsOneWidget);
+  });
+
   testWidgets('should_load_next_page_without_expanding_page_size', (
     tester,
   ) async {