feat(flutter): 统一二级页头并恢复新剧暖色

lib/pages/discover/category_dramas_page.dart

@@ -3,9 +3,9 @@
 import 'package:flutter/material.dart';
 
 import '../../core/data/models/drama.dart';
-import '../../core/theme/app_colors.dart';
 import '../../core/theme/app_theme.dart';
 import '../../core/widgets/empty_state.dart';
+import '../../core/widgets/plain_page_scaffold.dart';
 import '../../l10n/app_localizations.dart';
 import '../drama_detail/drama_detail_view.dart';
 import 'widgets/drama_grid.dart';
@@ -28,32 +28,25 @@ class CategoryDramasPage extends StatelessWidget {
     final l10n = AppLocalizations.of(context)!;
     return Theme(
       data: AppTheme.light(),
-      child: Scaffold(
-        key: const Key('category-dramas-page'),
-        backgroundColor: AppColors.ink,
-        appBar: AppBar(
-          backgroundColor: AppColors.ink,
-          foregroundColor: AppColors.onSurface,
-          title: Text(title),
-        ),
-        body: SafeArea(
-          top: false,
-          child: dramas.isEmpty
-              ? EmptyState(
-                  key: const Key('category-dramas-empty'),
-                  icon: Icons.movie_filter_outlined,
-                  title: l10n.noCategoryDramas,
-                  subtitle: l10n.emptyHint,
-                )
-              : SingleChildScrollView(
-                  padding: const EdgeInsets.only(top: 12, bottom: 28),
-                  child: DramaGrid(
-                    l10n: l10n,
-                    dramas: dramas,
-                    onOpen: (drama) => _open(context, drama),
-                  ),
+      child: PlainPageScaffold(
+        pageKey: const Key('category-dramas-page'),
+        backKey: const Key('category-dramas-back'),
+        title: title,
+        child: dramas.isEmpty
+            ? EmptyState(
+                key: const Key('category-dramas-empty'),
+                icon: Icons.movie_filter_outlined,
+                title: l10n.noCategoryDramas,
+                subtitle: l10n.emptyHint,
+              )
+            : SingleChildScrollView(
+                padding: const EdgeInsets.only(top: 8, bottom: 28),
+                child: DramaGrid(
+                  l10n: l10n,
+                  dramas: dramas,
+                  onOpen: (drama) => _open(context, drama),
                 ),
-        ),
+              ),
       ),
     );
   }