fix：按照shadcn_ui对着demo_shadcn对齐

lib/features/shell_page.dart

@@ -1,10 +1,11 @@
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:shadcn_ui/shadcn_ui.dart';
 
-import '../routing/app_routes.dart';
 import '../data/providers.dart';
-import '../theme/wise_tokens.dart';
+import '../routing/app_routes.dart';
+import '../theme/yanting_text.dart';
 import '../widgets/bottom_tab_bar.dart';
 import '../widgets/mini_player.dart';
 
@@ -16,30 +17,42 @@ class ShellPage extends ConsumerWidget {
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
+    final theme = ShadTheme.of(context);
     final player = ref.watch(audioPlayerControllerProvider);
     final controller = ref.read(audioPlayerControllerProvider.notifier);
+    final canPop = GoRouter.of(context).canPop();
     final selectedIndex = _tabs.indexWhere((tab) => tab.path == currentPath);
     final safeIndex = selectedIndex < 0 ? 0 : selectedIndex;
 
     return Scaffold(
+      backgroundColor: theme.colorScheme.background,
       appBar: AppBar(
-        title: const Column(
+        backgroundColor: theme.colorScheme.background,
+        surfaceTintColor: Colors.transparent,
+        elevation: 0,
+        leading: canPop
+            ? ShadIconButton.ghost(
+                onPressed: () => context.pop(),
+                icon: const Icon(LucideIcons.chevronLeft, size: 18),
+              )
+            : null,
+        title: Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            Text('研听'),
-            Text(
-              '全球机构研报中文解读',
-              style: TextStyle(
-                fontSize: 12,
-                color: WiseColors.textSecondary,
-                fontWeight: FontWeight.w500,
-              ),
-            ),
+            Text('研听', style: YantingText.listTitle),
+            Text('全球机构研报中文解读', style: YantingText.meta.copyWith(fontSize: 12)),
           ],
         ),
+        bottom: PreferredSize(
+          preferredSize: const Size.fromHeight(1),
+          child: ColoredBox(
+            color: theme.colorScheme.border,
+            child: const SizedBox(height: 1, width: double.infinity),
+          ),
+        ),
       ),
       body: ColoredBox(
-        color: Theme.of(context).scaffoldBackgroundColor,
+        color: theme.colorScheme.background,
         child: Stack(children: [Positioned.fill(child: child)]),
       ),
       bottomNavigationBar: SafeArea(