fix；设置和深浅色

lib/widgets/page_header.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:shadcn_ui/shadcn_ui.dart';
 
 import '../theme/yanting_text.dart';
 import '../theme/yanting_tokens.dart';
@@ -11,6 +12,7 @@ class PageHeader extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final colors = ShadTheme.of(context).colorScheme;
     return Padding(
       padding: const EdgeInsets.only(top: 4, bottom: 18),
       child: Column(
@@ -21,9 +23,7 @@ class PageHeader extends StatelessWidget {
             const SizedBox(height: 8),
             Text(
               subtitle!,
-              style: YantingText.sub.copyWith(
-                color: YantingColors.mutedForeground,
-              ),
+              style: YantingText.sub.copyWith(color: colors.mutedForeground),
             ),
           ],
         ],
@@ -40,6 +40,7 @@ class SectionTitle extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final colors = ShadTheme.of(context).colorScheme;
     return Padding(
       padding: const EdgeInsets.only(
         top: YantingSpacing.sectionGap,
@@ -50,7 +51,7 @@ class SectionTitle extends StatelessWidget {
           Text(title, style: YantingText.sectionTitle),
           if (icon != null) ...[
             const SizedBox(width: 6),
-            Icon(icon, size: 18, color: YantingColors.mutedForeground),
+            Icon(icon, size: 18, color: colors.mutedForeground),
           ],
         ],
       ),