Add PWA support for install-to-home-screen

Adds manifest.json, service worker with static asset caching,
resized cat icons, and meta tags for iOS/Android installability.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

raggr-frontend/public/manifest.json

@@ -0,0 +1,14 @@
+{
+  "name": "Ask Simba",
+  "short_name": "Simba",
+  "description": "Chat with Simba - your AI cat companion",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#FAF8F2",
+  "theme_color": "#2A4D38",
+  "icons": [
+    { "src": "/pwa-icon-192.png", "sizes": "192x192", "type": "image/png" },
+    { "src": "/pwa-icon-512.png", "sizes": "512x512", "type": "image/png" },
+    { "src": "/pwa-icon-512.png", "sizes": "512x512", "type": "image/png", "purpose": "maskable" }
+  ]
+}

raggr-frontend/public/sw.js

@@ -0,0 +1,46 @@
+const CACHE = 'simba-v1';
+
+self.addEventListener('install', (e) => {
+  self.skipWaiting();
+});
+
+self.addEventListener('activate', (e) => {
+  e.waitUntil(
+    caches.keys().then((keys) =>
+      Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k)))
+    )
+  );
+  self.clients.claim();
+});
+
+self.addEventListener('fetch', (e) => {
+  const { request } = e;
+  const url = new URL(request.url);
+
+  // Network-only for API calls
+  if (url.pathname.startsWith('/api/')) return;
+
+  // Cache-first for fingerprinted static assets
+  if (url.pathname.startsWith('/static/')) {
+    e.respondWith(
+      caches.match(request).then(
+        (cached) =>
+          cached ||
+          fetch(request).then((res) => {
+            const clone = res.clone();
+            caches.open(CACHE).then((c) => c.put(request, clone));
+            return res;
+          })
+      )
+    );
+    return;
+  }
+
+  // Network-first for navigation (offline fallback to cache)
+  if (request.mode === 'navigate') {
+    e.respondWith(
+      fetch(request).catch(() => caches.match(request))
+    );
+    return;
+  }
+});

raggr-frontend/rsbuild.config.ts

@@ -4,7 +4,16 @@ import { pluginReact } from '@rsbuild/plugin-react';
 export default defineConfig({
   plugins: [pluginReact()],
   html: {
-    title: 'Raggr',
+    title: 'Ask Simba',
     favicon: './src/assets/favicon.svg',
+    tags: [
+      { tag: 'link', attrs: { rel: 'manifest', href: '/manifest.json' } },
+      { tag: 'meta', attrs: { name: 'theme-color', content: '#2A4D38' } },
+      { tag: 'link', attrs: { rel: 'apple-touch-icon', href: '/apple-touch-icon.png' } },
+      { tag: 'meta', attrs: { name: 'apple-mobile-web-app-capable', content: 'yes' } },
+    ],
+  },
+  output: {
+    copy: [{ from: './public', to: '.' }],
   },
 });

raggr-frontend/src/index.tsx

@@ -11,3 +11,9 @@ if (rootEl) {
     </React.StrictMode>,
   );
 }
+
+if ('serviceWorker' in navigator) {
+  window.addEventListener('load', () => {
+    navigator.serviceWorker.register('/sw.js').catch(console.warn);
+  });
+}