Changes:
- Add user feedback when PWA installation unavailable
- Remove all inline event handlers (onclick=) for CSP compliance
- Show helpful messages: "Already Installed" vs "Browser Not Supported"
- Auto-dismiss unavailable message after 8 seconds
- All buttons now use addEventListener (CSP compliant)
Fixes: Non-responsive install button when prompt unavailable
Security: Full CSP compliance - no inline event handlers
Implements cache busting and progressive web app features:
**Version Management:**
- version.json manifest with changelog tracking
- Service worker with automatic update checking (hourly)
- Update notification UI with changelog display
- Configurable forced updates after timeout
- Cache control headers for optimal performance
**PWA Features:**
- manifest.json with app shortcuts
- Apple touch icon support
- "Add to Home Screen" functionality
- Offline support via service worker
**Cache Strategy:**
- HTML: 5-minute cache with revalidation
- CSS/JS: 1-year immutable cache
- Images: 1-year immutable cache
- version.json/service-worker.js: no-cache
**Integration:**
- All main pages updated with PWA meta tags
- Version manager loaded on all user-facing pages
- Production deployment successful
Users who previously visited the site will now automatically receive
update notifications when version changes.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
