feat: Add comprehensive iconography system and enhance brand guidelines

- Add complete Iconography section with Coolicons v4.1 integration
- Implement theme-adaptive icons (black for light mode, white for dark mode)
- Add Visual Aid modal dialog for accessibility settings
- Replace theme toggle with semantic moon/sun icons
- Add personality trait icons with appropriate semantic choices
- Fix code block theming to respect light/dark mode toggle
- Include comprehensive icon categories: Interface, File/Data, Communication, Navigation
- Add detailed implementation guides for HTML, SVG, and Tailwind
- Create accessibility-aware color system with vision deficiency support
- Add Inconsolata and Inter Tight fonts for complete typography system

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

brand-assets/icons/coolicons.v4.1/coolicons SVG/Media/Play.svg

@@ -0,0 +1,5 @@
+<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<g id="Media / Play">
+<path id="Vector" d="M5 17.3336V6.66698C5 5.78742 5 5.34715 5.18509 5.08691C5.34664 4.85977 5.59564 4.71064 5.87207 4.67499C6.18868 4.63415 6.57701 4.84126 7.35254 5.25487L17.3525 10.5882L17.3562 10.5898C18.2132 11.0469 18.642 11.2756 18.7826 11.5803C18.9053 11.8462 18.9053 12.1531 18.7826 12.4189C18.6418 12.7241 18.212 12.9537 17.3525 13.4121L7.35254 18.7454C6.57645 19.1593 6.1888 19.3657 5.87207 19.3248C5.59564 19.2891 5.34664 19.1401 5.18509 18.9129C5 18.6527 5 18.2132 5 17.3336Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+</g>
+</svg>