feat: Implement WCAG 2.2 AA accessibility improvements

[mpaiva]

Thanks for your contribution to the community. I leveraged your plugin in one of my projects and added some accessibility enhancements to meet WCAG 2.2 AA standards:

• Added visible focus indicators for all interactive elements
• Increased button touch targets to 44px minimum (WCAG 2.2 requirement)
• Enhanced form inputs with ARIA support and error states
• Implemented full keyboard navigation for FileDropZone component
• Added screen reader announcements for dynamic content
• Improved color contrast by removing transparency from text colors
• Added text alternatives for icons and emojis
• Enhanced Disclosure component with custom ARIA attributes
• Added semantic HTML5 landmarks and proper document structure
• Fixed external links with rel="noopener noreferrer" and descriptive ARIA labels
• Enabled text selection for better usability
• Added proper HTML structure with DOCTYPE, lang attribute, and meta tags

All components now fully support:

• Keyboard navigation (Tab, Enter, Space, Arrow keys)
• Screen readers (NVDA, JAWS, VoiceOver)
• High contrast mode
• Focus visible indicators

Replaced node-sass with dart-sass for better compatibility.

Cheers!

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