feat(pwa): add Progressive Web App support with iOS compatibility

- Install vite-plugin-pwa and workbox-window for PWA functionality
- Configure Vite with full PWA manifest (name, icons, theme, display)
- Add service worker caching for static assets only (no API cache)
- Create app icons (192x192, 512x512, apple-touch-icon)
- Generate iOS splash screens for multiple device sizes
- Add iOS-specific meta tags (apple-mobile-web-app-capable, etc.)
- Implement InstallPWA component with dual platform support:
  - Android/Chrome: beforeinstallprompt event with custom UI
  - iOS Safari: manual installation instructions with icons
- Add dismissal logic with 7-day localStorage persistence
- Update documentation to reflect 90% project completion

PWA implementation focuses on installability and static asset caching
while avoiding offline API cache (WebRTC requires active connection).

docs/SESSION_CONTEXT.md

@@ -21,8 +21,8 @@
 - Phase 2 (Matches & Ratings API) - ✅ COMPLETED
 - Phase 1.6 (Competition Heats) - ✅ COMPLETED
 - Phase 1.5 (Email & WSDC & Profiles & Security & QR Check-in) - ✅ COMPLETED
-**Progress:** ~85% overall
-**Next Goal:** PWA features, Production deployment
+**Progress:** ~90% overall
+**Next Goal:** Production deployment, monitoring, improved test coverage
 
 ### What Works Now
 - ✅ Docker Compose (nginx:8080 + frontend + backend + PostgreSQL)
@@ -48,10 +48,10 @@
 - ✅ **Landing page with hero section and features showcase - Phase 3**
 - ✅ **WebRTC test suite (7 backend tests passing) - Phase 3**
 - ✅ **Security hardening (CSRF protection, Account Lockout, Rate Limiting) - Phase 3**
+- ✅ **PWA features (manifest, icons, service worker, iOS support, install prompt) - Phase 3**
 - ✅ Real-time chat (Socket.IO for event & match rooms)
 
 ### What's Missing
-- ⏳ PWA features (manifest, service worker, offline support)
 - ⏳ Production deployment & monitoring
 - ⏳ Competition heats UI integration improvements
 - ⏳ Improved test coverage (currently ~43% backend)
@@ -70,6 +70,7 @@
 - React Router
 - Context API for state
 - socket.io-client for real-time chat
+- PWA (vite-plugin-pwa, Workbox for service worker)
 
 **Backend:**
 - Node.js 20 + Express 4.18.2
@@ -138,6 +139,7 @@
 - `frontend/src/utils/webrtcDetection.js` - **NEW: WebRTC browser detection - Phase 2.5**
 - `frontend/src/components/WebRTCWarning.jsx` - **NEW: WebRTC blocked warning component - Phase 2.5**
 - `frontend/src/components/heats/HeatsBanner.jsx` - **NEW: Heats declaration form component - Phase 1.6**
+- `frontend/src/components/pwa/InstallPWA.jsx` - **NEW: PWA install prompt (Android + iOS) - Phase 3**
 - `frontend/src/components/common/PasswordStrengthIndicator.jsx` - Password strength indicator
 - `frontend/src/components/common/VerificationBanner.jsx` - Email verification banner
 - `frontend/src/contexts/AuthContext.jsx` - JWT authentication integration
@@ -146,6 +148,10 @@
 - `frontend/src/data/countries.js` - **NEW: List of 195 countries - Phase 1.5**
 - `frontend/src/utils/__tests__/webrtcDetection.test.js` - **NEW: WebRTC detection tests - Phase 3**
 - `frontend/src/components/__tests__/WebRTCWarning.test.jsx` - **NEW: WebRTC warning tests - Phase 3**
+- `frontend/vite.config.js` - **UPDATED: PWA plugin configuration - Phase 3**
+- `frontend/index.html` - **UPDATED: iOS PWA meta tags, app icons, splash screens - Phase 3**
+- `frontend/public/icons/` - **NEW: App icons (192x192, 512x512, apple-touch-icon) - Phase 3**
+- `frontend/public/splash/` - **NEW: iOS splash screens for various devices - Phase 3**
 
 **Backend:**
 - `backend/src/app.js` - **UPDATED: CSRF protection, cookie-parser middleware - Phase 3**
@@ -432,7 +438,7 @@ RUN apk add --no-cache openssl
 
 ---
 
-**Last Updated:** 2025-11-15
+**Last Updated:** 2025-11-19
 **Phase 1 Status:** ✅ COMPLETED - Backend Foundation (Express + PostgreSQL + JWT + Socket.IO)
 **Phase 1.5 Status:** ✅ COMPLETED - Email Verification & WSDC Integration & User Profiles & Security
   - AWS SES email verification (link + PIN)
@@ -464,6 +470,6 @@ RUN apk add --no-cache openssl
   - ✅ Landing page with hero section
   - ✅ WebRTC test suite (7 backend tests passing)
   - ✅ Security hardening (CSRF, Account Lockout, env variables, comprehensive tests)
-  - ⏳ PWA features (manifest, service worker)
+  - ✅ PWA features (manifest, service worker, icons, iOS support, install prompts)
   - ⏳ Production deployment
-**Next Goal:** PWA features, Production deployment
+**Next Goal:** Production deployment, monitoring, improved test coverage