perf(export): further optimize detail loading and prioritize session stats

src/App.tsx

@@ -402,8 +402,10 @@ function App() {
 
   // 独立会话聊天窗口（仅显示聊天内容区域）
   if (isStandaloneChatWindow) {
-    const sessionId = new URLSearchParams(location.search).get('sessionId') || ''
-    return <ChatPage standaloneSessionWindow initialSessionId={sessionId} />
+    const params = new URLSearchParams(location.search)
+    const sessionId = params.get('sessionId') || ''
+    const standaloneSource = params.get('source')
+    return <ChatPage standaloneSessionWindow initialSessionId={sessionId} standaloneSource={standaloneSource} />
   }
 
   // 独立通知窗口