⚡️ perf: Defer Visactor chart libs to dashboard; minimize home bundle

Home started loading `/assets/visactor-*.js` due to static imports of `@visactor/react-vchart` and the Semi theme in dashboard components/hooks. This change moves chart dependencies to lazy/dynamic imports so they load only on dashboard routes.

Changes
- StatsCards.jsx: replace static `VChart` import with `React.lazy` + `Suspense` (fallback: null)
- ChartsPanel.jsx: replace static `VChart` import with `React.lazy` + `Suspense` (fallback: null)
- useDashboardCharts.js: remove static `initVChartSemiTheme` import; dynamically import and initialize the theme inside `useEffect` with a cancel guard

Behavior
- Home page no longer downloads `visactor` chunks on first load
- Chart libraries are fetched only when visiting `/console` (dashboard)
- No functional changes to chart rendering

Files
- web/src/components/dashboard/StatsCards.jsx
- web/src/components/dashboard/ChartsPanel.jsx
- web/src/hooks/dashboard/useDashboardCharts.js

Verification
- Build the app (`npm run build`) and open `/`: no `/assets/visactor-*.js` requests
- Navigate to `/console`: `visactor` chunks load and charts render as expected

Breaking Changes
- None

Follow-ups
- If needed, further trim homepage bundle by reducing heavy icon sets on the hero section

web/src/components/settings/personal/cards/NotificationSettings.js

@@ -106,7 +106,7 @@ const NotificationSettings = ({
         onSubmit={handleSubmit}
       >
         {() => (
-          <Tabs type="line" defaultActiveKey="notification">
+          <Tabs type="card" defaultActiveKey="notification">
             {/* 通知配置 Tab */}
             <TabPane
               tab={