feat: implement progressive web app support with offline capabilities

Add complete PWA implementation including service worker registration,
offline support, and installation prompts:

- Add vite-plugin-pwa and workbox-window dependencies for PWA tooling
- Configure VitePWA plugin with web app manifest and app metadata
- Set up Workbox caching strategies for API endpoints and CDN assets
- Implement service worker auto-update with user-triggered refresh
- Create usePWAInstall hook to handle beforeinstallprompt events
- Create useOnlineStatus hook for monitoring network connectivity
- Add InstallPrompt component with haptic feedback integration
- Add OfflineBanner component to notify users of offline status
- Configure PWA icons and assets (64x64, 192x192, 512x512 variants)
- Add TypeScript type declarations for virtual PWA register module
- Integrate PWA components and service worker into App.tsx and main.tsx
- Add PWA meta tags and viewport configuration to index.html

web/src/hooks/useOnlineStatus.ts

@@ -0,0 +1,22 @@
+import { useSyncExternalStore } from 'react'
+
+function subscribe(callback: () => void): () => void {
+    window.addEventListener('online', callback)
+    window.addEventListener('offline', callback)
+    return () => {
+        window.removeEventListener('online', callback)
+        window.removeEventListener('offline', callback)
+    }
+}
+
+function getSnapshot(): boolean {
+    return navigator.onLine
+}
+
+function getServerSnapshot(): boolean {
+    return true
+}
+
+export function useOnlineStatus(): boolean {
+    return useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot)
+}