docs: Add comprehensive favicon implementation guide

- Document favicon design specifications and file structure
- Explain browser compatibility and deployment process
- Provide troubleshooting guide and customization instructions
- Include technical details for developers and maintainers

This documentation ensures future developers understand the favicon
implementation and can maintain or customize it as needed.

Author: EC2 Default User

docs/favicon-implementation.md

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+# Favicon Implementation Guide
+
+## Overview
+
+The GenAI IDP accelerator includes a comprehensive favicon implementation that provides professional branding across all browsers and devices. This document explains the favicon setup and how it works.
+
+## Favicon Design
+
+The favicon features a **blue background with a white "D"** representing "Document" processing, which aligns with the GenAI Intelligent Document Processing purpose.
+
+### Design Specifications
+- **Primary Color**: Blue (#0066cc)
+- **Text Color**: White (#ffffff)
+- **Symbol**: "D" for Document
+- **Style**: High contrast for visibility across all browsers
+
+## Files Included
+
+The favicon implementation includes multiple formats for maximum compatibility:
+
+### Core Favicon Files
+- `favicon.ico` - Main favicon in ICO format (16x16 and 32x32 pixels)
+- `favicon-16x16.png` - 16x16 PNG version
+- `favicon-32x32.png` - 32x32 PNG version
+
+### Mobile and PWA Support
+- `apple-touch-icon.png` - 180x180 Apple Touch Icon for iOS devices
+- `logo192.png` - 192x192 PNG for PWA installations
+- `logo512.png` - 512x512 PNG for PWA installations
+
+### Browser Configuration
+- `browserconfig.xml` - Configuration for Internet Explorer and Edge
+
+### HTML Integration
+- `index.html` - Updated with comprehensive favicon links
+
+## HTML Implementation
+
+The `index.html` file includes comprehensive favicon links:
+
+```html
+<!-- Comprehensive favicon setup for all browsers -->
+<link rel="icon" type="image/x-icon" href="%PUBLIC_URL%/favicon.ico?v=4" />
+<link rel="shortcut icon" type="image/x-icon" href="%PUBLIC_URL%/favicon.ico?v=4" />
+<link rel="icon" type="image/png" sizes="16x16" href="%PUBLIC_URL%/favicon-16x16.png?v=4" />
+<link rel="icon" type="image/png" sizes="32x32" href="%PUBLIC_URL%/favicon-32x32.png?v=4" />
+<link rel="icon" type="image/png" sizes="192x192" href="%PUBLIC_URL%/logo192.png?v=4" />
+<link rel="icon" type="image/png" sizes="512x512" href="%PUBLIC_URL%/logo512.png?v=4" />
+<link rel="apple-touch-icon" sizes="180x180" href="%PUBLIC_URL%/apple-touch-icon.png?v=4" />
+<meta name="theme-color" content="#0066cc" />
+<meta name="msapplication-TileColor" content="#0066cc" />
+<meta name="msapplication-config" content="%PUBLIC_URL%/browserconfig.xml" />
+```
+
+## Browser Compatibility
+
+The favicon implementation supports:
+
+- ✅ **Chrome/Chromium** - All versions
+- ✅ **Firefox** - All versions  
+- ✅ **Safari** - Desktop and mobile
+- ✅ **Edge** - All versions
+- ✅ **Internet Explorer** - Legacy support
+- ✅ **Mobile browsers** - iOS, Android
+- ✅ **PWA installations** - Progressive Web Apps
+
+## Cache Busting
+
+The implementation includes version parameters (`?v=4`) to ensure browsers load the latest favicon when updates are made.
+
+## Deployment
+
+### Automatic Deployment
+When you deploy the GenAI IDP accelerator using the standard CloudFormation template, the favicon files are automatically included in the WebUI build process.
+
+### Manual Updates
+If you need to update the favicon on existing deployments:
+
+1. The favicon files are automatically copied during the CodeBuild process
+2. CloudFront cache is invalidated to show changes immediately
+3. No manual intervention required for new deployments
+
+## Customization
+
+### Changing the Favicon
+To customize the favicon for your organization:
+
+1. **Replace the favicon files** in `src/ui/public/` with your custom designs
+2. **Maintain the same file names** and formats
+3. **Update the version parameter** in `index.html` (e.g., `?v=5`)
+4. **Redeploy** the stack to apply changes
+
+### Recommended Tools
+- **ImageMagick** - For converting between formats
+- **GIMP/Photoshop** - For creating custom designs
+- **Online favicon generators** - For quick conversions
+
+### File Size Guidelines
+- Keep favicon files small (< 50KB each)
+- Use appropriate compression
+- Test across different browsers
+
+## Technical Details
+
+### Build Process Integration
+The favicon files are located in `src/ui/public/` and are automatically:
+1. Copied to the build output by React's build process
+2. Uploaded to the S3 WebUI bucket by CodeBuild
+3. Served through CloudFront with proper caching headers
+
+### Content Types
+The files are served with appropriate MIME types:
+- `.ico` files: `image/x-icon`
+- `.png` files: `image/png`
+- `.xml` files: `application/xml`
+
+## Troubleshooting
+
+### Favicon Not Showing
+If the favicon doesn't appear:
+
+1. **Hard refresh** the browser (Ctrl+F5 or Cmd+Shift+R)
+2. **Clear browser cache** completely
+3. **Try incognito/private mode**
+4. **Check CloudFront cache** - may take 1-3 minutes to propagate
+5. **Verify file accessibility** - test direct URL to favicon.ico
+
+### Browser-Specific Issues
+- **Chrome**: May cache aggressively - use incognito mode for testing
+- **Firefox**: Clear cache through Settings → Privacy & Security
+- **Safari**: Use Develop menu → Empty Caches
+- **Mobile**: May require app restart or cache clear
+
+## Future Enhancements
+
+Potential improvements for future versions:
+- **SVG favicon support** for vector graphics
+- **Dark mode variants** for different themes
+- **Animated favicons** for status indicators
+- **Organization-specific branding** options
+
+## Support
+
+For issues related to favicon implementation:
+1. Check browser developer tools for 404 errors
+2. Verify CloudFront distribution is serving files correctly
+3. Test with multiple browsers and devices
+4. Review CloudFormation stack outputs for correct URLs
+
+---
+
+This favicon implementation ensures professional, consistent branding across all GenAI IDP deployments and provides an excellent user experience across all browsers and devices.