feat(flutter): 统一二级页头并恢复新剧暖色

lib/pages/watch_records/watch_records_page.dart

@@ -19,6 +19,7 @@ import '../../core/theme/app_dimens.dart';
 import '../../core/theme/app_theme.dart';
 import '../../core/widgets/auth_gate.dart';
 import '../../core/widgets/empty_state.dart';
+import '../../core/widgets/plain_page_scaffold.dart';
 import '../../core/widgets/remote_image.dart';
 import '../../l10n/app_localizations.dart';
 import '../drama_detail/drama_detail_view.dart';
@@ -34,18 +35,11 @@ class WatchRecordsPage extends StatelessWidget {
     final l10n = AppLocalizations.of(context)!;
     return Theme(
       data: AppTheme.light(),
-      child: Scaffold(
-        key: const Key('watch-records-page'),
-        backgroundColor: AppColors.ink,
-        appBar: AppBar(
-          backgroundColor: AppColors.ink,
-          foregroundColor: Colors.white,
-          title: Text(l10n.watchHistory),
-        ),
-        body: SafeArea(
-          top: false,
-          child: signedIn ? const _WatchRecordsBody() : const AuthGatePanel(),
-        ),
+      child: PlainPageScaffold(
+        pageKey: const Key('watch-records-page'),
+        backKey: const Key('watch-records-back'),
+        title: l10n.watchHistory,
+        child: signedIn ? const _WatchRecordsBody() : const AuthGatePanel(),
       ),
     );
   }