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/Interface/Book.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="Interface / Book">
+<path id="Vector" d="M5 19.5002V6.2002C5 5.08009 5 4.51962 5.21799 4.0918C5.40973 3.71547 5.71547 3.40973 6.0918 3.21799C6.51962 3 7.08009 3 8.2002 3H17.4002C17.9602 3 18.2407 3 18.4546 3.10899C18.6427 3.20487 18.7948 3.35774 18.8906 3.5459C18.9996 3.75981 19 4.04005 19 4.6001V16.4001C19 16.9601 18.9996 17.2398 18.8906 17.4537C18.7948 17.6419 18.6429 17.7952 18.4548 17.8911C18.2411 18 17.961 18 17.402 18H7.25C6.00736 18 5 19.0074 5 20.25C5 20.6642 5.33579 21 5.75 21H16.402C16.961 21 17.2411 21 17.4548 20.8911C17.6429 20.7952 17.7948 20.642 17.8906 20.4538C17.9996 20.2399 18 19.9601 18 19.4V18" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
+</g>
+</svg>