feat: implement advanced PWA features (#85)

[AbuJulaybeeb]

Closes #85 ⭐

Implemented comprehensive Progressive Web App (PWA) features for TeachLink, transforming it into a native-like experience with robust offline capabilities, background synchronization, and seamless updates.

Changes Made
Service Worker Integration: Comprehensive
serviceWorker.ts
using Workbox for asset precaching and runtime caching (Network-First for APIs, Stale-While-Revalidate for images).
Update Management:
AppUpdateManager.tsx
shows a banner when a new version is available, with logic managed by the
usePWA
hook.
Offline Synchronization:
OfflineSyncManager.tsx
provides feedback during background data sync events.
Native Features Layer:
NativeIntegrationLayer.tsx
provides a unified interface for Push Notifications and Camera access.
Installability: Created
manifest.json
and updated the root layout metadata to enable PWA installation.
Verification
Verified production build and type correctness.
Manually tested service worker registration and offline fallback via Chrome DevTools.
Verified manifest recognition and installation availability.

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