fix(home): 调整榜单版式并去掉二级分类

test/home/home_grid_layout_test.dart

@@ -12,6 +12,7 @@ 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/core/theme/app_theme.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';
@@ -55,18 +56,7 @@ void main() {
         .map((key) => tester.getCenter(find.byKey(key)).dx)
         .toList();
     expect(sectionCenters, orderedEquals(sectionCenters.toList()..sort()));
-
-    final tagKeys = [
-      const Key('home-tag-hot'),
-      const Key('home-tag-uplifting'),
-      const Key('home-tag-sweet'),
-      const Key('home-tag-faceSlap'),
-      const Key('home-tag-angst'),
-    ];
-    final tagCenters = tagKeys
-        .map((key) => tester.getCenter(find.byKey(key)).dx)
-        .toList();
-    expect(tagCenters, orderedEquals(tagCenters.toList()..sort()));
+    expect(find.byKey(const Key('home-secondary-tags')), findsNothing);
     expect(find.text('Featured'), findsOneWidget);
     expect(find.text('New'), findsOneWidget);
     expect(find.text('Categories'), findsOneWidget);
@@ -117,6 +107,11 @@ void main() {
     expect(find.byKey(const Key('ranking-page')), findsOneWidget);
     expect(find.byKey(const Key('ranking-hero')), findsOneWidget);
     expect(find.byKey(const Key('home-grid-cards')), findsNothing);
+    final home = tester.widget<DecoratedBox>(find.byKey(const Key('home-grid')));
+    expect(
+      (home.decoration as BoxDecoration).gradient,
+      AppTheme.pageGradient,
+    );
 
     await tester.tap(find.byKey(const Key('home-section-categories')));
     await tester.pumpAndSettle();
@@ -158,7 +153,7 @@ void main() {
     await tester.pumpAndSettle();
     await tester.tap(find.byKey(const Key('home-section-featured')));
     await tester.pumpAndSettle();
-    expect(find.byKey(const Key('home-secondary-tags')), findsOneWidget);
+    expect(find.byKey(const Key('home-secondary-tags')), findsNothing);
 
     final afterScrollable = find
         .descendant(
@@ -176,7 +171,7 @@ void main() {
     final repository = _PagedCatalogRepository();
     await _pumpApp(tester, repository);
 
-    expect(find.byKey(const Key('home-secondary-tags')), findsOneWidget);
+    expect(find.byKey(const Key('home-secondary-tags')), findsNothing);
     await tester.drag(
       find.byKey(const Key('home-primary-page-view')),
       const Offset(-320, 0),
@@ -195,7 +190,7 @@ void main() {
       const Offset(320, 0),
     );
     await tester.pumpAndSettle();
-    expect(find.byKey(const Key('home-secondary-tags')), findsOneWidget);
+    expect(find.byKey(const Key('home-secondary-tags')), findsNothing);
   });
 
   testWidgets('should_load_next_page_without_expanding_page_size', (