The file /home/project/src/hooks/useNetworkStatus.ts has been updated. Made 1 replacement.

Here's the result of running `cat -n` on a snippet of the edited file:
  50→
  51→    window.addEventListener('online', handleOnline);
  52→    window.addEventListener('offline', handleOffline);
  53→
  54→    // 检测慢网络（使用轻量级 DNS 预解析代替 HTTP 请求）
  55→    const checkConnectionSpeed = async () => {
  56→      if (!navigator.onLine) return;
  57→      
  58→      // 仅通过 navigator.connection API 检测（如果可用）
  59→      const connection = (navigator as any).connection;
  60→      if (connection) {
  61→        setState(prev => ({
  62→          ...prev,
  63→          isSlowConnection: connection.effectiveType === 'slow-2g' || connection.effectiveType === '2g'
  64→        }));
  65→      }
  66→      // 如果不支持 Connection API，则不进行主动探测，避免产生大量 502 错误
  67→    };
  68→
  69→    // 每60秒检测一次网络质量（降低频率）
  70→    const interval = setInterval(checkConnectionSpeed, 60000);
  71→    checkConnectionSpeed();
  72→
  73→    return () => {
  74→      window.removeEventListener('online', handleOnline);
  75→      window.removeEventListener('offline', handleOffline);
  76→      clearInterval(interval);