"use client";

import { useEffect } from "react";

/** Registers the service worker for PWA install / offline shell. */
export function PwaRegister() {
  useEffect(() => {
    if (typeof window === "undefined" || !("serviceWorker" in navigator)) return;
    const onLoad = () => {
      navigator.serviceWorker.register("/sw.js").catch(() => {
        /* ignore — private mode / insecure context */
      });
    };
    if (document.readyState === "complete") onLoad();
    else window.addEventListener("load", onLoad);
    return () => window.removeEventListener("load", onLoad);
  }, []);

  return null;
}