Prepare for PWA and add more resolutions

public/manifest.json

@@ -0,0 +1,40 @@
+{
+  "name": "Bitfielder - Bitfield Shader Editor",
+  "short_name": "Bitfielder",
+  "description": "Interactive bitfield shader editor for creating visual patterns using bitwise operations",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#000000",
+  "theme_color": "#000000",
+  "orientation": "any",
+  "scope": "/",
+  "categories": ["graphics", "developer", "productivity"],
+  "icons": [
+    {
+      "src": "/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ],
+  "screenshots": [
+    {
+      "src": "/screenshot-desktop.png",
+      "sizes": "1280x720",
+      "type": "image/png",
+      "form_factor": "wide"
+    },
+    {
+      "src": "/screenshot-mobile.png",
+      "sizes": "390x844",
+      "type": "image/png",
+      "form_factor": "narrow"
+    }
+  ]
+}

public/sw.js

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+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);
+          }
+        })
+      );
+    })
+  );
+});