refactor(client): 往来/设备/登录/关于颜色迁移到 context.tokens

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

client/lib/screens/about/about_screen.dart

@@ -8,7 +8,7 @@ import 'package:package_info_plus/package_info_plus.dart';
 import 'package:url_launcher/url_launcher.dart';
 import '../../core/config/app_config.dart';
 import '../../core/config/app_info.dart';
-import '../../core/theme/app_theme.dart';
+import '../../core/theme/context_tokens.dart';
 import '../../core/update/app_updater.dart';
 import '../../core/utils/dialog_util.dart';
 import '../../providers/feedback_provider.dart';
@@ -42,7 +42,7 @@ class _AboutScreenState extends ConsumerState<AboutScreen> {
                 _AboutRow(
                   label: '最新版本',
                   value: 'v${updateInfo.latestVersion}',
-                  valueColor: AppTheme.success,
+                  valueColor: context.tokens.success,
                   trailing: TextButton(
                     onPressed: () => startInAppUpdate(context, updateInfo),
                     child: const Text('立即更新'),
@@ -52,7 +52,7 @@ class _AboutScreenState extends ConsumerState<AboutScreen> {
                 _AboutRow(
                   label: '最新版本',
                   value: updateInfo != null ? '已是最新' : '检查中…',
-                  valueColor: AppTheme.textSecondary,
+                  valueColor: context.tokens.muted,
                   trailing: TextButton(
                     onPressed: () async {
                       final messenger = ScaffoldMessenger.of(context);
@@ -469,10 +469,10 @@ class _AboutSection extends StatelessWidget {
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
             Text(title,
-                style: const TextStyle(
+                style: TextStyle(
                     fontSize: 14,
                     fontWeight: FontWeight.w600,
-                    color: AppTheme.primaryDark)),
+                    color: context.tokens.primaryDark)),
             const Divider(height: 24),
             ...children,
           ],
@@ -504,14 +504,14 @@ class _AboutRow extends StatelessWidget {
           SizedBox(
             width: 88,
             child: Text(label,
-                style: const TextStyle(
-                    fontSize: 13, color: AppTheme.textSecondary)),
+                style: TextStyle(
+                    fontSize: 13, color: context.tokens.muted)),
           ),
           Expanded(
             child: Text(value,
                 style: TextStyle(
                     fontSize: 13,
-                    color: valueColor ?? AppTheme.textPrimary,
+                    color: valueColor ?? context.tokens.text,
                     fontWeight: FontWeight.w500)),
           ),
           if (trailing != null) trailing!,