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

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

client/lib/widgets/searchable_option_field.dart

@@ -4,7 +4,7 @@ import '../core/utils/dialog_util.dart';
 import 'package:flutter/material.dart';
 import '../core/responsive/responsive.dart';
 import 'package:lpinyin/lpinyin.dart';
-import '../core/theme/app_theme.dart';
+import '../core/theme/context_tokens.dart';
 
 class OptionItem {
   final int id;
@@ -100,18 +100,18 @@ class SearchableOptionField extends StatelessWidget {
               suffixIcon: selected
                   ? GestureDetector(
                       onTap: () => onChanged(null),
-                      child: const Icon(Icons.close,
-                          size: 14, color: AppTheme.textSecondary),
+                      child: Icon(Icons.close,
+                          size: 14, color: context.tokens.muted),
                     )
-                  : const Icon(Icons.arrow_drop_down,
-                      size: 16, color: AppTheme.textSecondary),
+                  : Icon(Icons.arrow_drop_down,
+                      size: 16, color: context.tokens.muted),
             ),
             isEmpty: !selected,
             child: Text(
               selected ? _displayText : hint,
               style: TextStyle(
                 fontSize: 12,
-                color: selected ? Colors.black87 : AppTheme.textSecondary,
+                color: selected ? Colors.black87 : context.tokens.muted,
               ),
               overflow: TextOverflow.ellipsis,
             ),
@@ -269,7 +269,7 @@ class _SearchDialogState extends State<_SearchDialog> {
                   ? Center(
                       child: Text(
                         canCreate ? '无匹配结果，可新增到基础数据' : '无匹配结果',
-                        style: const TextStyle(color: AppTheme.textSecondary),
+                        style: TextStyle(color: context.tokens.muted),
                       ),
                     )
                   : ListView.builder(
@@ -287,7 +287,7 @@ class _SearchDialogState extends State<_SearchDialog> {
                               : null,
                           selected: isSelected,
                           selectedTileColor:
-                              AppTheme.primary.withValues(alpha: 0.08),
+                              context.tokens.primary.withValues(alpha: 0.08),
                           onTap: () => Navigator.of(context).pop(opt.id),
                         );
                       },
@@ -316,8 +316,8 @@ class _SearchDialogState extends State<_SearchDialog> {
         if (widget.selectedId != null)
           TextButton(
             onPressed: () => Navigator.of(context).pop(-1),
-            child: const Text('清除选择',
-                style: TextStyle(color: AppTheme.textSecondary)),
+            child: Text('清除选择',
+                style: TextStyle(color: context.tokens.muted)),
           ),
         TextButton(
           onPressed: () => Navigator.of(context).pop(null),