统一弹窗风格：Material Design 3 规范，消除颜色不一致

- 所有 AlertDialog 替换为 ModernDialog
- ConfirmDialog/AssetDialogs 去掉 GlassPanel，统一 surfaceContainer 背景
- 按钮统一 FilledButton + TextButton
- 修复 import 路径

flutter_monisuo/lib/ui/pages/mine/mine_page.dart

@@ -3,6 +3,7 @@ import 'package:provider/provider.dart';
 import '../../../core/theme/app_theme.dart';
 import '../../../core/theme/app_spacing.dart';
 import '../../../providers/auth_provider.dart';
+import '../../shared/modern_dialog.dart';
 import '../auth/login_page.dart';
 import 'components/avatar_circle.dart';
 import 'components/logout_button.dart';
@@ -61,80 +62,60 @@ class _MinePageState extends State<MinePage>
   }
 
   void _showComingSoon(String feature) {
-    showDialog(
+    ModernDialog.info(
       context: context,
-      builder: (ctx) => AlertDialog(
-        title: const Text('功能開發中'),
-        content: Text('$feature功能正在開發中，敬請期待'),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.of(ctx).pop(),
-            child: const Text('知道了'),
-          ),
-        ],
-      ),
+      title: '功能開發中',
+      description: '$feature功能正在開發中，敬請期待',
     );
   }
 
   void _showAboutDialog() {
-    showDialog(
+    ModernDialog.show(
       context: context,
-      builder: (ctx) => AlertDialog(
-        title: Row(
-          children: [
-            AvatarCircle(radius: 16, fontSize: 12),
-            const SizedBox(width: 8),
-            const Text('模擬所'),
-          ],
-        ),
-        content: const Column(
-          mainAxisSize: MainAxisSize.min,
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Text('虛擬貨幣模擬交易平臺'),
-            SizedBox(height: 8),
-            Text('版本: 1.0.0'),
-          ],
-        ),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.of(ctx).pop(),
-            child: const Text('確定'),
-          ),
+      titleWidget: Row(
+        children: [
+          AvatarCircle(radius: 16, fontSize: 12),
+          const SizedBox(width: 8),
+          const Text('模擬所'),
         ],
       ),
+      content: const Column(
+        mainAxisSize: MainAxisSize.min,
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Text('虛擬貨幣模擬交易平臺'),
+          SizedBox(height: 8),
+          Text('版本: 1.0.0'),
+        ],
+      ),
+      actions: [
+        ModernDialogAction(label: '確定', isPrimary: true),
+      ],
     );
   }
 
   void _handleLogout(AuthProvider auth) {
-    final colorScheme = Theme.of(context).colorScheme;
-    showDialog(
+    ModernDialog.show(
       context: context,
-      builder: (ctx) => AlertDialog(
-        title: const Text('退出登錄'),
-        content: const Text('確定要退出登錄嗎？'),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.of(ctx).pop(),
-            child: Text('取消',
-                style: TextStyle(color: colorScheme.onSurfaceVariant)),
-          ),
-          TextButton(
-            onPressed: () async {
-              Navigator.of(ctx).pop();
-              await auth.logout();
-              if (ctx.mounted) {
-                Navigator.of(ctx).pushAndRemoveUntil(
-                  MaterialPageRoute(builder: (_) => const LoginPage()),
-                  (route) => false,
-                );
-              }
-            },
-            child: Text('退出', style: TextStyle(color: colorScheme.error)),
-
-          ),
-        ],
-      ),
+      title: '退出登錄',
+      description: '確定要退出登錄嗎？',
+      actions: [
+        ModernDialogAction(label: '取消'),
+        ModernDialogAction(
+          label: '退出',
+          isPrimary: true,
+          isDestructive: true,
+          onPressed: () async {
+            await auth.logout();
+            if (context.mounted) {
+              Navigator.of(context).pushAndRemoveUntil(
+                MaterialPageRoute(builder: (_) => const LoginPage()),
+                (route) => false,
+              );
+            }
+          },
+        ),
+      ],
     );
   }
 }