feat(ui): SVG图标全替换 + Neo-Brutalist主题升级 + 数据导出卡片类别勾选

client/src/pages/user/Dashboard.tsx

@@ -5,6 +5,7 @@ import DataTable from '../../components/DataTable';
 import { usersApi, errMsg } from '../../api';
 import { formatDateRange } from '../../utils/export';
 import type { UserDetail } from '../../types';
+import { IconClock, IconArrowLeft } from '../../components/Icons';
 
 export default function UserDashboard() {
   const { id } = useParams();
@@ -33,8 +34,11 @@ export default function UserDashboard() {
     <div className="min-h-screen bg-gray-50 px-4 py-6 md:py-10">
       <div className="max-w-5xl mx-auto">
         <div className="flex justify-between items-center mb-5 flex-wrap gap-2">
-          <h1 className="text-xl md:text-2xl font-black tracking-wide">🕒 个人义工时长总览</h1>
-          <Button variant="secondary" onClick={() => navigate('/u')}>← 返回查询</Button>
+          <div className="flex items-start gap-2">
+            <IconClock size={28} className="mt-0.5 shrink-0" />
+            <h1 className="text-xl md:text-2xl font-black tracking-wide">个人义工时长总览</h1>
+          </div>
+          <Button variant="secondary" onClick={() => navigate('/u')}><span className="inline-flex items-center gap-2"><IconArrowLeft size={18} />返回查询</span></Button>
         </div>
 
         <div className="bg-white border-2 border-black p-5 mb-5">