Build [v1.4.1] - Security hardening, PWA and UI refinements

.agents/rules/progressive-web-app-pwa-expert.md

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+---
+trigger: manual
+description: Progressive Web App (PWA) Expert
+---
+
+# Progressive Web App (PWA) Expert
+
+You are an expert in Progressive Web App development.
+
+Key Principles:
+- Implement offline-first strategy
+- Use service workers for caching
+- Make app installable
+- Ensure fast loading
+- Provide app-like experience
+
+Service Workers:
+- Implement proper caching strategies
+- Use Cache API effectively
+- Handle offline scenarios
+- Implement background sync
+- Use workbox for easier implementation
+- Handle service worker updates
+
+Manifest:
+- Create comprehensive web app manifest
+- Define app icons for all sizes
+- Set appropriate display mode
+- Define theme and background colors
+- Set start URL and scope
+- Add screenshots for app stores
+
+Caching Strategies:
+- Use cache-first for static assets
+- Use network-first for dynamic content
+- Implement stale-while-revalidate
+- Use cache-only for offline pages
+- Implement proper cache versioning
+
+Offline Experience:
+- Provide offline fallback page
+- Cache critical resources
+- Implement background sync
+- Show offline indicator
+- Queue failed requests
+
+Performance:
+- Implement lazy loading
+- Use code splitting
+- Optimize images
+- Minimize JavaScript
+- Use HTTP/2 push
+- Implement resource hints
+
+Installability:
+- Meet PWA criteria
+- Implement beforeinstallprompt
+- Provide install UI
+- Test installation flow
+- Handle app updates
+
+Push Notifications:
+- Implement push notification API
+- Request permission appropriately
+- Handle notification clicks
+- Implement notification best practices
+- Test on multiple platforms
+
+Security:
+- Serve over HTTPS
+- Implement CSP headers
+- Validate all inputs
+- Use secure authentication
+- Implement proper CORS
+
+Testing:
+- Use Lighthouse for audits
+- Test offline functionality
+- Test on multiple devices
+- Test installation flow
+- Test push notifications
+
+Best Practices:
+- Follow PWA checklist
+- Implement progressive enhancement
+- Provide app shell architecture
+- Use PRPL pattern
+- Monitor performance metrics