feat(home): 首页改为三列探索网格

test/home/home_preview_layout_test.dart

@@ -9,6 +9,7 @@ import 'package:shared_preferences_platform_interface/in_memory_shared_preferenc
 import 'package:shared_preferences_platform_interface/shared_preferences_async_platform_interface.dart';
 
 import 'package:fruitshorts/app.dart';
+import 'package:fruitshorts/core/data/models/content_category.dart';
 import 'package:fruitshorts/core/data/models/drama.dart';
 import 'package:fruitshorts/core/data/models/home_feed.dart';
 import 'package:fruitshorts/core/data/repositories/favorite_repository.dart';
@@ -20,6 +21,7 @@ import 'package:fruitshorts/l10n/app_localizations.dart';
 import 'package:fruitshorts/pages/home/home_feed_channel.dart';
 import 'package:fruitshorts/pages/player/widgets/home_feed_header.dart';
 import 'package:fruitshorts/pages/player/widgets/home_feed_overlay.dart';
+import 'package:fruitshorts/pages/player/player_view.dart';
 import 'package:video_player/video_player.dart';
 
 import '../support/fake_catalog.dart';
@@ -30,7 +32,9 @@ import '../support/fake_notice_repository.dart';
 import '../support/widget_player.dart';
 
 void main() {
-  testWidgets('should_render_immersive_feed_on_home', (tester) async {
+  testWidgets('should_render_three_column_explorer_grid_on_home', (
+    tester,
+  ) async {
     SharedPreferencesAsyncPlatform.instance =
         InMemorySharedPreferencesAsync.empty();
     tester.view.physicalSize = const Size(390, 844);
@@ -48,6 +52,58 @@ void main() {
         ),
       ],
     );
+    await tester.pumpWidget(
+      LumaDramaApp(
+        playerFactory: createWidgetPlayer,
+        catalogRepository: catalog,
+        categoryRepository: FakeCategoryRepository(
+          catalog: catalog,
+          categories: const [
+            ContentCategory(id: 'costume', name: '古装'),
+            ContentCategory(id: 'community', name: '社群'),
+          ],
+        ),
+        watchHistoryRepository: InMemoryWatchHistoryRepository(),
+        favoriteRepository: InMemoryFavoriteRepository(cards: catalog.dramas),
+        playbackRepository: FakePlaybackRepository(),
+        commentRepository: FakeCommentRepository(),
+        interactionRepository: FakeInteractionRepository(),
+        noticeRepository: FakeNoticeRepository(),
+        haptics: FakeHaptics(),
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    expect(find.byKey(const Key('home-grid')), findsOneWidget);
+    expect(find.byKey(const Key('home-grid-cards')), findsOneWidget);
+    final grid = tester.widget<SliverGrid>(
+      find.byKey(const Key('home-grid-cards')),
+    );
+    final delegate =
+        grid.gridDelegate as SliverGridDelegateWithFixedCrossAxisCount;
+    expect(delegate.crossAxisCount, 3);
+    expect(delegate.crossAxisSpacing, 8);
+    expect(delegate.mainAxisSpacing, 8);
+    expect(find.byKey(const Key('home-section-featured')), findsOneWidget);
+    expect(find.byKey(const Key('home-section-new')), findsOneWidget);
+    expect(find.byKey(const Key('home-section-categories')), findsOneWidget);
+    expect(find.byKey(const Key('home-section-ranking')), findsOneWidget);
+    expect(find.byKey(const Key('home-section-category-古装')), findsOneWidget);
+    expect(find.byKey(const Key('home-section-category-社群')), findsOneWidget);
+    expect(find.byKey(const Key('home-secondary-tags')), findsOneWidget);
+    expect(find.byKey(const Key('home-grid-filter')), findsOneWidget);
+    expect(find.byType(PageView), findsNothing);
+    expect(tester.takeException(), isNull);
+  });
+
+  testWidgets('should_keep_immersive_player_on_recommend_tab', (tester) async {
+    SharedPreferencesAsyncPlatform.instance =
+        InMemorySharedPreferencesAsync.empty();
+    tester.view.physicalSize = const Size(390, 844);
+    tester.view.devicePixelRatio = 1;
+    addTearDown(tester.view.resetPhysicalSize);
+    addTearDown(tester.view.resetDevicePixelRatio);
+    final catalog = FakeCatalogRepository();
     await tester.pumpWidget(
       LumaDramaApp(
         playerFactory: createWidgetPlayer,
@@ -63,14 +119,13 @@ void main() {
       ),
     );
     await tester.pumpAndSettle();
-    await tester.tap(find.byKey(const Key('tab-home')));
+    await tester.tap(find.byKey(const Key('tab-recommend')));
     await tester.pumpAndSettle();
 
-    expect(find.byKey(const Key('home-feed-title')), findsOneWidget);
-    expect(find.byKey(const Key('home-feed-full-series')), findsOneWidget);
+    expect(find.byKey(const Key('home-grid')), findsNothing);
     expect(find.byType(PageView), findsOneWidget);
-    expect(find.byKey(const Key('home-browse-page')), findsNothing);
-    expect(tester.takeException(), isNull);
+    expect(tester.widget<PlayerPage>(find.byType(PlayerPage)).homeMode, isTrue);
+    expect(find.byKey(const Key('home-feed-title')), findsOneWidget);
   });
 
   testWidgets('should_render_new_feed_structure_with_formatted_counts', (