♻️ 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/components/playground/ChatArea.jsx

@@ -0,0 +1,132 @@
+/*
+Copyright (C) 2025 QuantumNous
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+For commercial licensing, please contact support@quantumnous.com
+*/
+
+import React from 'react';
+import {
+  Card,
+  Chat,
+  Typography,
+  Button,
+} from '@douyinfe/semi-ui';
+import {
+  MessageSquare,
+  Eye,
+  EyeOff,
+} from 'lucide-react';
+import { useTranslation } from 'react-i18next';
+import CustomInputRender from './CustomInputRender';
+
+const ChatArea = ({
+  chatRef,
+  message,
+  inputs,
+  styleState,
+  showDebugPanel,
+  roleInfo,
+  onMessageSend,
+  onMessageCopy,
+  onMessageReset,
+  onMessageDelete,
+  onStopGenerator,
+  onClearMessages,
+  onToggleDebugPanel,
+  renderCustomChatContent,
+  renderChatBoxAction,
+}) => {
+  const { t } = useTranslation();
+
+  const renderInputArea = React.useCallback((props) => {
+    return <CustomInputRender {...props} />;
+  }, []);
+
+  return (
+    <Card
+      className="h-full"
+      bordered={false}
+      bodyStyle={{ padding: 0, height: 'calc(100vh - 66px)', display: 'flex', flexDirection: 'column', overflow: 'hidden' }}
+    >
+      {/* 聊天头部 */}
+      {styleState.isMobile ? (
+        <div className="pt-4"></div>
+      ) : (
+        <div className="px-6 py-4 bg-gradient-to-r from-purple-500 to-blue-500 rounded-t-2xl">
+          <div className="flex items-center justify-between">
+            <div className="flex items-center gap-3">
+              <div className="w-10 h-10 rounded-full bg-white/20 backdrop-blur flex items-center justify-center">
+                <MessageSquare size={20} className="text-white" />
+              </div>
+              <div>
+                <Typography.Title heading={5} className="!text-white mb-0">
+                  {t('AI 对话')}
+                </Typography.Title>
+                <Typography.Text className="!text-white/80 text-sm hidden sm:inline">
+                  {inputs.model || t('选择模型开始对话')}
+                </Typography.Text>
+              </div>
+            </div>
+            <div className="flex items-center gap-2">
+              <Button
+                icon={showDebugPanel ? <EyeOff size={14} /> : <Eye size={14} />}
+                onClick={onToggleDebugPanel}
+                theme="borderless"
+                type="primary"
+                size="small"
+                className="!rounded-lg !text-white/80 hover:!text-white hover:!bg-white/10"
+              >
+                {showDebugPanel ? t('隐藏调试') : t('显示调试')}
+              </Button>
+            </div>
+          </div>
+        </div>
+      )}
+
+      {/* 聊天内容区域 */}
+      <div className="flex-1 overflow-hidden">
+        <Chat
+          ref={chatRef}
+          chatBoxRenderConfig={{
+            renderChatBoxContent: renderCustomChatContent,
+            renderChatBoxAction: renderChatBoxAction,
+            renderChatBoxTitle: () => null,
+          }}
+          renderInputArea={renderInputArea}
+          roleConfig={roleInfo}
+          style={{
+            height: '100%',
+            maxWidth: '100%',
+            overflow: 'hidden'
+          }}
+          chats={message}
+          onMessageSend={onMessageSend}
+          onMessageCopy={onMessageCopy}
+          onMessageReset={onMessageReset}
+          onMessageDelete={onMessageDelete}
+          showClearContext
+          showStopGenerate
+          onStopGenerator={onStopGenerator}
+          onClear={onClearMessages}
+          className="h-full"
+          placeholder={t('请输入您的问题...')}
+        />
+      </div>
+    </Card>
+  );
+};
+
+export default ChatArea;