refactor(ui): 清理 K26 旧 UI 与死代码

test/discover/home_all_dramas_grid_test.dart

@@ -38,7 +38,6 @@ void main() {
       await tester.pumpAndSettle();
 
       expect(find.text('Continue Watching'), findsNothing);
-      expect(find.byKey(const Key('home-all-dramas-title')), findsNothing);
       expect(find.text('Recommended'), findsOneWidget);
       expect(find.text('For You'), findsNothing);
       final grid = tester.widget<SliverGrid>(
@@ -133,7 +132,6 @@ void main() {
     await tester.tap(find.byKey(const Key('tab-discover')));
     await tester.pumpAndSettle();
 
-    expect(find.byKey(const Key('home-all-dramas-title')), findsNothing);
     expect(find.text('No matching dramas.'), findsOneWidget);
     expect(find.byKey(const Key('empty-state-content')), findsOneWidget);
 
@@ -153,7 +151,6 @@ void main() {
     await tester.tap(find.byKey(const Key('tab-discover')));
     await tester.pumpAndSettle();
 
-    expect(find.byKey(const Key('home-all-dramas-title')), findsNothing);
     expect(find.text('Categories could not be loaded.'), findsOneWidget);
     expect(find.text('Retry'), findsOneWidget);
     expect(find.byKey(const Key('empty-state-icon')), findsOneWidget);
@@ -179,7 +176,6 @@ void main() {
     );
     await tester.pumpAndSettle();
 
-    expect(find.byKey(const Key('home-all-dramas-title')), findsNothing);
     expect(find.text('City Lights & Velvet Nights'), findsWidgets);
     expect(tester.takeException(), isNull);
   });