Add PWA manifest and service worker

public/manifest.json

@@ -0,0 +1,21 @@
+{
+  "name": "Tia - Baby Tracking",
+  "short_name": "Tia",
+  "description": "Your baby tracking companion",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#fdf2f2",
+  "theme_color": "#fb7185",
+  "icons": [
+    {
+      "src": "/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ]
+}

public/sw.js

@@ -0,0 +1,49 @@
+/// <reference lib="webworker" />
+
+declare const self: ServiceWorkerGlobalType;
+
+const CACHE_NAME = "tia-v1";
+const STATIC_ASSETS = [
+  "/",
+  "/manifest.json",
+];
+
+self.addEventListener("install", (event) => {
+  event.waitUntil(
+    caches.open(CACHE_NAME).then((cache) => cache.addAll(STATIC_ASSETS))
+  );
+  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)))
+    )
+  );
+  self.clients.claim();
+});
+
+self.addEventListener("fetch", (event) => {
+  // Skip non-GET requests
+  if (event.request.method !== "GET") return;
+
+  // Skip API requests
+  if (event.request.url.includes("/api/")) return;
+
+  event.respondWith(
+    caches.match(event.request).then((cached) => {
+      const networked = fetch(event.request)
+        .then((response) => {
+          const clone = response.clone();
+          caches.open(CACHE_NAME).then((cache) => cache.put(event.request, clone));
+          return response;
+        })
+        .catch(() => cached);
+
+      return cached || networked;
+    })
+  );
+});
+
+export {};

src/app/layout.tsx

@@ -13,8 +13,13 @@ const geistMono = Geist_Mono({
 });
 
 export const metadata: Metadata = {
-  title: "Create Next App",
+  title: "Tia - Baby Tracking",
-  description: "Generated by create next app",
+  description: "Your baby tracking companion",
+  manifest: "/manifest.json",
+  icons: [
+    { url: "/icon-192.png", sizes: "192x192", type: "image/png" },
+    { url: "/icon-512.png", sizes: "512x512", type: "image/png" },
+  ],
 };
 
 export default function RootLayout({

src/app/page.tsx

@@ -200,6 +200,12 @@ export default function HomePage() {
     // Process queue when coming online
     const handleOnline = () => processOfflineQueue();
     window.addEventListener("online", handleOnline);
+
+    // Register service worker
+    if ("serviceWorker" in navigator) {
+      navigator.serviceWorker.register("/sw.js").catch(console.error);
+    }
+
     return () => window.removeEventListener("online", handleOnline);
   }, []);