♻️ refactor(web): migrate React modules from .js to .jsx and align entrypoint

- Rename React components/pages/utilities that contain JSX to `.jsx` across `web/src`
- Update import paths and re-exports to match new `.jsx` extensions
- Fix Vite entry by switching `web/index.html` from `/src/index.js` to `/src/index.jsx`
- Verified remaining `.js` files are plain JS (hooks/helpers/constants) and do not require JSX
- No runtime behavior changes; extension and reference alignment only

Context: Resolves the Vite pre-transform error caused by the stale `/src/index.js` entry after migrating to `.jsx`.

web/src/pages/Home/index.jsx

@@ -20,7 +20,7 @@ For commercial licensing, please contact support@quantumnous.com
 import React, { useContext, useEffect, useState } from 'react';
 import { Button, Typography, Tag, Input, ScrollList, ScrollItem } from '@douyinfe/semi-ui';
 import { API, showError, copy, showSuccess } from '../../helpers';
-import { useIsMobile } from '../../hooks/common/useIsMobile.js';
+import { useIsMobile } from '../../hooks/common/useIsMobile';
 import { API_ENDPOINTS } from '../../constants/common.constant';
 import { StatusContext } from '../../context/Status';
 import { marked } from 'marked';