Improve chat UI for secure channel creation pages

Fix iOS PWA installation and improve cross-platform compatibility

- Fix manifest.json paths (use relative paths with ./ for iOS)
- Update Apple Touch Icons structure to use organized folders
- Add missing 180x180px icon requirement for iOS
- Fix apple-mobile-web-app meta tags configuration
- Add viewport-fit=cover for iPhone X+ notch support

- Fix missing showInstallButton() method causing TypeError
- Add complete showInstallBanner() and createInstallBanner() methods
- Implement proper hideInstallPrompts() functionality
- Add iOS-specific installation instructions modal
- Fix event handling for install prompt dismissal

- Restructure PWA icons into platform-specific folders:
  - ./logo/pwa/ios/ for Apple Touch Icons
  - ./logo/pwa/android/ for Android launcher icons
  - ./logo/pwa/windows11/ for Microsoft Tiles
- Update manifest.json to reference correct icon paths
- Add browserconfig.xml for Windows 11 tile configuration

- Improve PWA registration script without conflicts
- Add proper error handling for offline functionality
- Integrate with existing PWA modules (install prompt, offline manager)
- Add update notifications for new app versions

- Enhanced detection for iOS Safari vs other browsers
- Improved installation flow for different platforms
- Better user feedback for unsupported installation methods
- Added fallback instructions for manual installation

- Add comprehensive PWA support detection
- Implement proper iOS standalone mode detection
- Add console logging for installation status tracking
- Include developer utilities for PWA management

Tested on: iOS Safari, Chrome, Edge, Firefox
Resolves iOS PWA installation issues and improves overall PWA experience."

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