feat: 添加 PWA 支持 — 可安装到主屏幕、离线缓存、刘海屏适配

ROADMAP.md

@@ -33,10 +33,10 @@
 - 抽中后打卡确认（拍照上传，形成回忆）
 - "本周契约执行率" 统计
 
-### PWA 支持
-- 添加 Web App Manifest，支持"添加到主屏幕"
-- Service Worker 离线缓存基础页面
-- `viewport-fit=cover` 适配刘海屏
+### ~~PWA 支持~~（已完成）
+- ~~添加 Web App Manifest，支持"添加到主屏幕"~~
+- ~~Service Worker 离线缓存基础页面~~
+- ~~`viewport-fit=cover` 适配刘海屏~~
 
 ### 盲盒房间删除 / 退出
 - 房间创建者可删除房间（级联清理成员 & 想法）

public/sw.js

@@ -0,0 +1,68 @@
+const CACHE_NAME = "nowhatever-v1";
+
+const PRECACHE_URLS = ["/", "/offline"];
+
+self.addEventListener("install", (event) => {
+  event.waitUntil(
+    caches
+      .open(CACHE_NAME)
+      .then((cache) => cache.addAll(PRECACHE_URLS))
+      .then(() => self.skipWaiting())
+  );
+});
+
+self.addEventListener("activate", (event) => {
+  event.waitUntil(
+    caches
+      .keys()
+      .then((keys) =>
+        Promise.all(
+          keys
+            .filter((key) => key !== CACHE_NAME)
+            .map((key) => caches.delete(key))
+        )
+      )
+      .then(() => self.clients.claim())
+  );
+});
+
+self.addEventListener("fetch", (event) => {
+  const { request } = event;
+
+  if (request.method !== "GET") return;
+
+  const url = new URL(request.url);
+
+  // API calls: network-only
+  if (url.pathname.startsWith("/api/")) return;
+
+  // Static assets (_next/static, icons, fonts): cache-first
+  if (
+    url.pathname.startsWith("/_next/static/") ||
+    url.pathname.match(/\.(png|jpg|svg|ico|woff2?)$/)
+  ) {
+    event.respondWith(
+      caches.match(request).then(
+        (cached) =>
+          cached ||
+          fetch(request).then((response) => {
+            const clone = response.clone();
+            caches.open(CACHE_NAME).then((cache) => cache.put(request, clone));
+            return response;
+          })
+      )
+    );
+    return;
+  }
+
+  // HTML pages: network-first, fallback to cache, then offline page
+  event.respondWith(
+    fetch(request)
+      .then((response) => {
+        const clone = response.clone();
+        caches.open(CACHE_NAME).then((cache) => cache.put(request, clone));
+        return response;
+      })
+      .catch(() => caches.match(request).then((cached) => cached || caches.match("/offline")))
+  );
+});

scripts/generate-pwa-icons.mjs

@@ -0,0 +1,37 @@
+import sharp from "sharp";
+import { mkdirSync } from "fs";
+import { join, dirname } from "path";
+import { fileURLToPath } from "url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const publicDir = join(__dirname, "..", "public");
+
+const ACCENT = "#10b981";
+const BG_DARK = "#030712";
+
+function buildSvg(size) {
+  const fontSize = Math.round(size * 0.32);
+  const radius = Math.round(size * 0.18);
+  return `<svg xmlns="http://www.w3.org/2000/svg" width="${size}" height="${size}" viewBox="0 0 ${size} ${size}">
+    <rect width="${size}" height="${size}" rx="${radius}" fill="${BG_DARK}"/>
+    <text x="50%" y="54%" text-anchor="middle" dominant-baseline="central"
+          font-family="system-ui,-apple-system,sans-serif" font-weight="700"
+          font-size="${fontSize}" fill="${ACCENT}">NW</text>
+  </svg>`;
+}
+
+const sizes = [192, 512];
+
+for (const size of sizes) {
+  const svg = Buffer.from(buildSvg(size));
+  const out = join(publicDir, `icon-${size}x${size}.png`);
+  await sharp(svg).resize(size, size).png().toFile(out);
+  console.log(`✓ ${out}`);
+}
+
+const appleSvg = Buffer.from(buildSvg(180));
+const appleOut = join(publicDir, "apple-touch-icon.png");
+await sharp(appleSvg).resize(180, 180).png().toFile(appleOut);
+console.log(`✓ ${appleOut}`);
+
+console.log("\nPWA icons generated.");

src/app/layout.tsx

@@ -2,6 +2,7 @@ import type { Metadata, Viewport } from "next";
 import { Geist } from "next/font/google";
 import "./globals.css";
 import GlobalUserBadge from "@/components/GlobalUserBadge";
+import ServiceWorkerRegistrar from "@/components/ServiceWorkerRegistrar";
 
 const geistSans = Geist({
   variable: "--font-geist-sans",
@@ -19,6 +20,8 @@ export const viewport: Viewport = {
   initialScale: 1,
   maximumScale: 1,
   userScalable: false,
+  viewportFit: "cover",
+  themeColor: "#10b981",
 };
 
 const themeScript = `(function(){try{var t=localStorage.getItem("nowhatever-theme")||"system";var r=t;if(t==="system")r=window.matchMedia("(prefers-color-scheme:light)").matches?"light":"dark";document.documentElement.setAttribute("data-theme",r)}catch(e){}})()`;
@@ -32,8 +35,10 @@ export default function RootLayout({
     <html lang="zh-CN" suppressHydrationWarning>
       <head>
         <script dangerouslySetInnerHTML={{ __html: themeScript }} />
+        <link rel="apple-touch-icon" href="/apple-touch-icon.png" />
       </head>
       <body className={`${geistSans.variable} font-sans antialiased`}>
+        <ServiceWorkerRegistrar />
         <GlobalUserBadge />
         {children}
       </body>

src/app/manifest.ts

@@ -0,0 +1,32 @@
+import type { MetadataRoute } from "next";
+
+export default function manifest(): MetadataRoute.Manifest {
+  return {
+    name: "NoWhatever — 别说随便",
+    short_name: "NoWhatever",
+    description: "像 Tinder 一样滑卡片，和朋友一起决定去哪吃！",
+    start_url: "/",
+    display: "standalone",
+    background_color: "#030712",
+    theme_color: "#10b981",
+    orientation: "portrait",
+    icons: [
+      {
+        src: "/icon-192x192.png",
+        sizes: "192x192",
+        type: "image/png",
+      },
+      {
+        src: "/icon-512x512.png",
+        sizes: "512x512",
+        type: "image/png",
+      },
+      {
+        src: "/icon-512x512.png",
+        sizes: "512x512",
+        type: "image/png",
+        purpose: "maskable",
+      },
+    ],
+  };
+}

src/app/offline/page.tsx

@@ -0,0 +1,23 @@
+"use client";
+
+import { WifiOff } from "lucide-react";
+
+export default function OfflinePage() {
+  return (
+    <div className="min-h-dvh flex flex-col items-center justify-center px-6 bg-background text-foreground">
+      <div className="w-16 h-16 rounded-2xl bg-surface flex items-center justify-center mb-6">
+        <WifiOff className="w-8 h-8 text-muted" />
+      </div>
+      <h1 className="text-xl font-bold text-heading mb-2">没有网络连接</h1>
+      <p className="text-secondary text-center mb-8">
+        请检查你的网络设置，然后重试
+      </p>
+      <button
+        onClick={() => window.location.reload()}
+        className="px-6 py-3 bg-accent text-white rounded-xl font-medium active:scale-95 transition-transform"
+      >
+        重试
+      </button>
+    </div>
+  );
+}

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;
+}