fix: raise PWA precache size limit to 3 MB

Main bundle grew past the default 2 MB workbox limit, breaking
Docker builds. Raise to 3 MB to unblock deployment.

packages/web/vite.config.ts

@@ -30,6 +30,7 @@ export default defineConfig({
         skipWaiting: true,
         clientsClaim: true,
         cleanupOutdatedCaches: true,
+        maximumFileSizeToCacheInBytes: 3 * 1024 * 1024,
       },
     }),
   ],