feat: add PWA support for offline cold load

- Add vite-plugin-pwa with Workbox caching strategy
- Cache all static assets (JS, CSS, HTML, fonts, WASM)
- Enable service worker in dev mode for testing
- Add PWA manifest with app name and icons
- Add SVG icons for PWA (192x192 and 512x512)
- Increase cache limit to 10MB for large chunks (Board ~8MB)
- Add runtime caching for API responses and Google Fonts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

index.html

@@ -5,6 +5,7 @@
 	<title>Jeff Emmett</title>
 	<meta charset="UTF-8" />
 	<link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>🍄</text></svg>" />
+	<link rel="apple-touch-icon" href="/pwa-192x192.svg" />
 	<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
 	<meta http-equiv="Permissions-Policy" content="midi=*, microphone=*, camera=*, autoplay=*">
 	<link rel="preconnect" href="https://fonts.googleapis.com" />

package.json

@@ -115,6 +115,7 @@
 		"playwright": "^1.57.0",
 		"typescript": "^5.6.3",
 		"vite": "^6.0.3",
+		"vite-plugin-pwa": "^1.2.0",
 		"vite-plugin-top-level-await": "^1.6.0",
 		"vite-plugin-wasm": "^3.5.0",
 		"vitest": "^3.2.4",

src/public/pwa-192x192.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 192 192" width="192" height="192">
+  <rect width="192" height="192" fill="#1a1a2e" rx="24"/>
+  <text x="96" y="130" font-size="120" text-anchor="middle" font-family="system-ui">🍄</text>
+</svg>

src/public/pwa-512x512.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" width="512" height="512">
+  <rect width="512" height="512" fill="#1a1a2e" rx="64"/>
+  <text x="256" y="350" font-size="320" text-anchor="middle" font-family="system-ui">🍄</text>
+</svg>

vite.config.ts

@@ -2,6 +2,7 @@ import { defineConfig, loadEnv } from "vite"
 import react from "@vitejs/plugin-react"
 import wasm from "vite-plugin-wasm"
 import topLevelAwait from "vite-plugin-top-level-await"
+import { VitePWA } from "vite-plugin-pwa"
 
 export default defineConfig(({ mode }) => {
   // Load env file based on `mode` in the current working directory.
@@ -25,17 +26,103 @@ export default defineConfig(({ mode }) => {
 
   return {
     envPrefix: ["VITE_"],
-    plugins: [react(), wasm(), topLevelAwait()],
+    plugins: [
+      react(),
+      wasm(),
+      topLevelAwait(),
+      VitePWA({
+        registerType: 'autoUpdate',
+        injectRegister: 'auto',
+        workbox: {
+          // Cache all static assets
+          globPatterns: ['**/*.{js,css,html,ico,png,svg,woff2,wasm}'],
+          // Increase the limit for large chunks (Board is ~8MB with tldraw, automerge, etc.)
+          maximumFileSizeToCacheInBytes: 10 * 1024 * 1024, // 10MB
+          // Runtime caching for dynamic requests
+          runtimeCaching: [
+            {
+              // Cache API responses with network-first strategy
+              urlPattern: /^https?:\/\/.*\/api\/.*/i,
+              handler: 'NetworkFirst',
+              options: {
+                cacheName: 'api-cache',
+                expiration: {
+                  maxEntries: 100,
+                  maxAgeSeconds: 60 * 60 * 24, // 24 hours
+                },
+                networkTimeoutSeconds: 10,
+              },
+            },
+            {
+              // Cache fonts
+              urlPattern: /^https:\/\/fonts\.googleapis\.com\/.*/i,
+              handler: 'CacheFirst',
+              options: {
+                cacheName: 'google-fonts-cache',
+                expiration: {
+                  maxEntries: 10,
+                  maxAgeSeconds: 60 * 60 * 24 * 365, // 1 year
+                },
+              },
+            },
+            {
+              urlPattern: /^https:\/\/fonts\.gstatic\.com\/.*/i,
+              handler: 'CacheFirst',
+              options: {
+                cacheName: 'gstatic-fonts-cache',
+                expiration: {
+                  maxEntries: 10,
+                  maxAgeSeconds: 60 * 60 * 24 * 365, // 1 year
+                },
+              },
+            },
+          ],
+        },
+        manifest: {
+          name: 'Jeff Emmett Canvas',
+          short_name: 'Canvas',
+          description: 'Collaborative canvas for research and creativity',
+          theme_color: '#1a1a2e',
+          background_color: '#1a1a2e',
+          display: 'standalone',
+          start_url: '/',
+          icons: [
+            {
+              src: '/pwa-192x192.svg',
+              sizes: '192x192',
+              type: 'image/svg+xml',
+            },
+            {
+              src: '/pwa-512x512.svg',
+              sizes: '512x512',
+              type: 'image/svg+xml',
+            },
+            {
+              src: '/pwa-512x512.svg',
+              sizes: '512x512',
+              type: 'image/svg+xml',
+              purpose: 'maskable',
+            },
+          ],
+        },
+        devOptions: {
+          // Enable SW in development for testing
+          enabled: true,
+          type: 'module',
+        },
+      }),
+    ],
     server: {
       host: "0.0.0.0",
       port: 5173,
       strictPort: true,
       // Force IPv4 to ensure compatibility with WSL2 and remote devices
       listen: "0.0.0.0",
-      // Configure HMR to use the correct hostname for WebSocket connections
+      // Configure HMR to use the client's hostname for WebSocket connections
+      // This allows HMR to work from any network (localhost, LAN, Tailscale)
       hmr: {
-        host: wslIp,
-        port: 5173,
+        // Use 'clientPort' to let client determine the correct host
+        clientPort: 5173,
       },
       // Proxy API requests to the worker server
       proxy: {