🐛 Fix PWA install prompt showing after installation

Fixed critical bug where PWA install message continued showing after app installation

- ✅ Enhanced PWA installation status detection
- ✅ Fixed install prompt logic to hide after installation
- ✅ Improved Service Worker update handling
- ✅ Added proper installation state management
- ✅ Enhanced iOS Safari PWA detection
- ✅ Added installation preferences storage

- Added installationChecked flag for better state management
- Enhanced checkInstallationStatus() method with multiple detection methods
- Improved shouldShowPrompt() logic to prevent showing after installation
- Added periodic installation monitoring for iOS devices
- Enhanced Service Worker activation event handling
- Added PWAUtils.checkInstallationStatus() utility method

- public/src/pwa/install-prompt.js (major refactor)
- public/index.html (PWA logic improvements)
- public/sw.js (Service Worker enhancements)

- PWA install message no longer shows after successful installation
- Only update notifications are shown for installed PWAs
- Proper distinction between install prompts and update notifications

Version: Enhanced Security Edition v4.01.413

src/components/ui/Header.jsx

@@ -497,7 +497,7 @@ const EnhancedMinimalHeader = ({
                         React.createElement('p', {
                             key: 'subtitle',
                             className: 'text-xs sm:text-sm text-muted hidden sm:block'
-                        }, 'End-to-end freedom. v4.01.412')
+                        }, 'End-to-end freedom. v4.01.413')
                     ])
                 ]),