feat(flutter): 统一二级页头并恢复新剧暖色

lib/pages/create/create_view.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 
 import '../../core/theme/app_colors.dart';
 import '../../core/theme/app_theme.dart';
+import '../../core/widgets/plain_page_scaffold.dart';
 import '../../l10n/app_localizations.dart';
 
 const double _cardHeight = 196;
@@ -343,11 +344,11 @@ class _CreatePlaceholderPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final l10n = AppLocalizations.of(context)!;
-    return Scaffold(
-      key: const Key('create-placeholder-page'),
-      backgroundColor: AppColors.ink,
-      appBar: AppBar(title: Text(title)),
-      body: Center(
+    return PlainPageScaffold(
+      pageKey: const Key('create-placeholder-page'),
+      backKey: const Key('create-placeholder-back'),
+      title: title,
+      child: Center(
         child: Column(
           mainAxisSize: MainAxisSize.min,
           children: [