feat: 添加 PWA 支持 — 可安装到主屏幕、离线缓存、刘海屏适配

src/components/ServiceWorkerRegistrar.tsx

@@ -0,0 +1,13 @@
+"use client";
+
+import { useEffect } from "react";
+
+export default function ServiceWorkerRegistrar() {
+  useEffect(() => {
+    if ("serviceWorker" in navigator) {
+      navigator.serviceWorker.register("/sw.js").catch(() => {});
+    }
+  }, []);
+
+  return null;
+}