feat: PWA support - manifest, service worker, icons

public/sw.js

@@ -0,0 +1,68 @@
+const CACHE_NAME = 'camila-ai-v1';
+const urlsToCache = [
+  '/',
+  '/index.html',
+  '/style.css',
+  '/app.js',
+  '/manifest.json',
+  '/icon-192.png',
+  '/icon-512.png'
+];
+
+// Install event - cache assets
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches.open(CACHE_NAME)
+      .then((cache) => {
+        console.log('Camila AI: Cache opened');
+        return cache.addAll(urlsToCache);
+      })
+      .then(() => self.skipWaiting())
+  );
+});
+
+// Activate event - clean old caches
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys().then((cacheNames) => {
+      return Promise.all(
+        cacheNames.map((cacheName) => {
+          if (cacheName !== CACHE_NAME) {
+            console.log('Camila AI: Deleting old cache:', cacheName);
+            return caches.delete(cacheName);
+          }
+        })
+      );
+    }).then(() => self.clients.claim())
+  );
+});
+
+// Fetch event - serve from cache, fallback to network
+self.addEventListener('fetch', (event) => {
+  event.respondWith(
+    caches.match(event.request)
+      .then((response) => {
+        if (response) {
+          return response;
+        }
+        return fetch(event.request).then((response) => {
+          // Don't cache non-successful responses or non-GET requests
+          if (!response || response.status !== 200 || event.request.method !== 'GET') {
+            return response;
+          }
+          // Clone the response
+          const responseToCache = response.clone();
+          caches.open(CACHE_NAME).then((cache) => {
+            cache.put(event.request, responseToCache);
+          });
+          return response;
+        });
+      })
+      .catch(() => {
+        // If both cache and network fail, show offline page for HTML requests
+        if (event.request.headers.get('accept').includes('text/html')) {
+          return caches.match('/');
+        }
+      })
+  );
+});