feat(flutter): 统一二级页头并恢复新剧暖色

lib/pages/favorites/favorites_page.dart

@@ -15,6 +15,7 @@ import '../../core/theme/app_theme.dart';
 import '../../core/widgets/auth_gate.dart';
 import '../../core/widgets/empty_state.dart';
 import '../../core/widgets/library_drama_tile.dart';
+import '../../core/widgets/plain_page_scaffold.dart';
 import '../../l10n/app_localizations.dart';
 import '../drama_detail/drama_detail_view.dart';
 import 'favorites_binding.dart';
@@ -52,19 +53,13 @@ class _FavoritesPageState extends State<FavoritesPage> {
     final signedIn = context.watch<AuthController>().isSignedIn;
     return Theme(
       data: AppTheme.light(),
-      child: Scaffold(
-        backgroundColor: AppColors.ink,
-        appBar: AppBar(
-          backgroundColor: AppColors.ink,
-          foregroundColor: Colors.white,
-          title: Text(l10n.myFavorites),
-        ),
-        body: SafeArea(
-          top: false,
-          child: signedIn
-              ? _FavoritesBody(favorites: context.watch<FavoriteController>())
-              : const AuthGatePanel(),
-        ),
+      child: PlainPageScaffold(
+        pageKey: const Key('favorites-page'),
+        backKey: const Key('favorites-back'),
+        title: l10n.myFavorites,
+        child: signedIn
+            ? _FavoritesBody(favorites: context.watch<FavoriteController>())
+            : const AuthGatePanel(),
       ),
     );
   }