Implemented comprehensive SEO improvements to boost search visibility:
**Technical SEO Files:**
- Add robots.txt with proper crawling rules and sitemap reference
- Add manifest.json for PWA support with app metadata
- Add browserconfig.xml for Windows tile configuration
- Add sitemap.xml with multilingual support (11 languages)
**Structured Data:**
- Add JSON-LD schema for WebApplication with feature list
- Add JSON-LD schema for SoftwareSourceCode with repository info
- Add JSON-LD schema for Organization with social links
**Meta Tags Enhancement:**
- Fix Open Graph images to use absolute URLs
- Add image dimensions (width/height) for OG images
- Add image alt text for better accessibility
- Link manifest.json for PWA functionality
**Accessibility Improvements:**
- Add ARIA labels to all modal dialogs (role, aria-modal, aria-labelledby)
- Add aria-hidden to decorative icons
- Add aria-label to interactive buttons
- Add aria-live for dynamic content updates
Expected SEO score improvement: 6.5/10 → 8.5+/10
