Function handler

frontend/src/components/IframeBox/config.ts:35–40

(event: MessageEvent)

  const iframeId = v4();
  globalIframeList.set(iframeId, iframe);
  const handler = async (event: MessageEvent) => {
    const cfg = event.data as Partial<IframeEvent>;
    if (cfg?.app === "MCSManager" && cfg?.id) {
      return await iframeEventDispatch(cfg);
    }
  };
  window.addEventListener("message", handler);

  onUnmounted(() => {