feat(flutter): 剧场页搜索与吸顶筛选精致化

test/discover/home_all_dramas_grid_test.dart

@@ -10,6 +10,7 @@ import 'package:fruitshorts/core/data/repositories/category_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_colors.dart';
 import 'package:shared_preferences_platform_interface/in_memory_shared_preferences_async.dart';
 import 'package:shared_preferences_platform_interface/shared_preferences_async_platform_interface.dart';
 
@@ -170,6 +171,65 @@ void main() {
     expect(counter.categoryLoads + counter.feedLoads, greaterThan(before));
     expect(find.byType(RefreshProgressIndicator), findsNothing);
   });
+
+  testWidgets('should_style_search_shell_and_focus_border', (tester) async {
+    await _pumpTheater(tester, categoryRepository: _GridCategoryRepository());
+    BoxDecoration shell() =>
+        tester
+                .widget<AnimatedContainer>(
+                  find.byKey(const Key('discover-search-shell')),
+                )
+                .decoration!
+            as BoxDecoration;
+
+    expect(shell().borderRadius, BorderRadius.circular(20));
+    expect((shell().border! as Border).top.color, AppColors.border);
+
+    await tester.tap(find.byKey(const Key('discover-search')));
+    await tester.pump(const Duration(milliseconds: 200));
+
+    expect((shell().border! as Border).top.color, AppColors.blue);
+  });
+
+  testWidgets('should_pin_theater_filters_when_scrolling', (tester) async {
+    await _pumpTheater(
+      tester,
+      categoryRepository: _GridCategoryRepository(
+        discoverFeed: _tallDiscoverFeed,
+      ),
+    );
+    BoxDecoration header() =>
+        tester
+                .widget<AnimatedContainer>(
+                  find.byKey(const Key('theater-sticky-header')),
+                )
+                .decoration!
+            as BoxDecoration;
+    final before = tester.getRect(
+      find.byKey(const Key('theater-sticky-header')),
+    );
+    expect(header().color, Colors.transparent);
+
+    await tester.drag(_verticalFeed, const Offset(0, -220));
+    await tester.pumpAndSettle();
+
+    final after = tester.getRect(
+      find.byKey(const Key('theater-sticky-header')),
+    );
+    expect(after.top, closeTo(before.top, 0.5));
+    expect(header().color, AppColors.ink);
+  });
+
+  testWidgets('should_use_compact_refresh_indicator', (tester) async {
+    await _pumpTheater(tester, categoryRepository: _GridCategoryRepository());
+    final indicator = tester.widget<RefreshIndicator>(
+      find.byKey(const Key('discover-refresh')),
+    );
+
+    expect(indicator.color, AppColors.blue);
+    expect(indicator.strokeWidth, 2);
+    expect(indicator.edgeOffset, 110);
+  });
 }
 
 final Finder _verticalFeed = find.byWidgetPredicate(