Initialize repo and add session changes (2025-09-08)

public/guest-sw.js

@@ -0,0 +1,42 @@
+// Minimal service worker for Guest PWA queue sync
+self.addEventListener('install', (event) => {
+  self.skipWaiting();
+});
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(self.clients.claim());
+});
+
+self.addEventListener('fetch', (event) => {
+  const req = event.request;
+  if (req.method !== 'GET' || !req.url.startsWith(self.location.origin)) return;
+  event.respondWith((async () => {
+    const cache = await caches.open('guest-runtime');
+    const cached = await cache.match(req);
+    if (cached) return cached;
+    try {
+      const res = await fetch(req);
+      // Cache static assets and images
+      const ct = res.headers.get('content-type') || '';
+      if (res.ok && (ct.includes('text/css') || ct.includes('javascript') || ct.startsWith('image/'))) {
+        cache.put(req, res.clone());
+      }
+      return res;
+    } catch (e) {
+      return cached || new Response('Offline', { status: 503 });
+    }
+  })());
+});
+
+self.addEventListener('sync', (event) => {
+  if (event.tag === 'upload-queue') {
+    event.waitUntil(
+      (async () => {
+        const clients = await self.clients.matchAll({ includeUncontrolled: true, type: 'window' });
+        for (const client of clients) {
+          client.postMessage({ type: 'sync-queue' });
+        }
+      })()
+    );
+  }
+});