refactor(client): widgets 颜色迁移到 context.tokens

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/lib/widgets/status_badge.dart

@@ -1,5 +1,5 @@
 import 'package:flutter/material.dart';
-import '../core/theme/app_theme.dart';
+import '../core/theme/context_tokens.dart';
 
 enum OrderStatus { draft, pending, approved, rejected }
 
@@ -29,19 +29,19 @@ class StatusBadge extends StatelessWidget {
     switch (status) {
       case OrderStatus.draft:
         bg = const Color(0xFFF5F5F5);
-        fg = AppTheme.textSecondary;
+        fg = context.tokens.muted;
         break;
       case OrderStatus.pending:
         bg = const Color(0xFFFFF3E0);
-        fg = AppTheme.accent;
+        fg = context.tokens.accent;
         break;
       case OrderStatus.approved:
         bg = const Color(0xFFE8F5E9);
-        fg = AppTheme.success;
+        fg = context.tokens.success;
         break;
       case OrderStatus.rejected:
         bg = const Color(0xFFFFEBEE);
-        fg = AppTheme.danger;
+        fg = context.tokens.danger;
         break;
     }
     return Container(