fix: TargetOutlined换为LineChartOutlined避免白屏

frontend/src/pages/Dashboard/Dashboard.jsx

@@ -7,7 +7,7 @@ import {
   BarChartOutlined,
   PictureOutlined,
   UploadOutlined,
-  TargetOutlined,
+  LineChartOutlined,
   AimOutlined,
 } from '@ant-design/icons'
 import useAuthStore from '../../stores/authStore'
@@ -145,7 +145,7 @@ function Dashboard() {
       value: targets.length || '--',
     },
     {
-      icon: <TargetOutlined style={{ color: '#7b5e9e', fontSize: 14 }} />,
+      icon: <LineChartOutlined style={{ color: '#7b5e9e', fontSize: 14 }} />,
       bg: '#f3e5f5',
       label: '基础目标完成率',
       value: completion.base,