Prepare for PWA and add more resolutions

public/sw.js

@@ -0,0 +1,50 @@
+const CACHE_NAME = 'bitfielder-v1';
+const urlsToCache = [
+  '/',
+  '/index.html',
+  '/src/main.ts',
+  '/src/FakeShader.ts',
+  '/src/ShaderWorker.ts',
+  '/src/Storage.ts',
+  '/src/icons.ts',
+  '/manifest.json'
+];
+
+// Install event - cache resources
+self.addEventListener('install', event => {
+  event.waitUntil(
+    caches.open(CACHE_NAME)
+      .then(cache => {
+        console.log('Opened cache');
+        return cache.addAll(urlsToCache);
+      })
+  );
+});
+
+// Fetch event - serve from cache when offline
+self.addEventListener('fetch', event => {
+  event.respondWith(
+    caches.match(event.request)
+      .then(response => {
+        // Return cached version or fetch from network
+        return response || fetch(event.request);
+      }
+    )
+  );
+});
+
+// Activate event - clean up old caches
+self.addEventListener('activate', event => {
+  event.waitUntil(
+    caches.keys().then(cacheNames => {
+      return Promise.all(
+        cacheNames.map(cacheName => {
+          if (cacheName !== CACHE_NAME) {
+            console.log('Deleting old cache:', cacheName);
+            return caches.delete(cacheName);
+          }
+        })
+      );
+    })
+  );
+});