🚀 Feature: Comprehensive Accessibility Improvements

This Pull Request introduces comprehensive accessibility improvements to ensure better compliance with WCAG 2.1 Level AA guidelines and make the interface more inclusive for all users.

Key Improvements

• Semantic HTML & ARIA Roles: Enhanced structure using appropriate HTML5 elements and ARIA roles
• Keyboard Navigation: All interactive elements are fully accessible via keyboard
• Skip Navigation Link: Implemented "Skip to main content" link
• Descriptive Labels: Added aria-label attributes to all interactive elements
• Text Alternatives for Charts: Charts now include visually hidden data tables for screen readers
• Color Contrast: Verified all color combinations meet WCAG AA requirements (≥4.5:1 )
• Form Accessibility: Search form now has proper role="search" and labels
• External Links: All external links include rel="noopener noreferrer" for security

Documentation

• ACCESSIBILITY.md: Complete documentation of all accessibility features and implementation details

Testing

The application was tested with:

• ✅ Keyboard navigation
• ✅ Screen readers (NVDA/VoiceOver)
• ✅ Lighthouse accessibility audit
• ✅ Color contrast verification

All changes maintain the original design and functionality while significantly improving accessibility.