Complete React migration improvements and fixes

- Fix button styling inconsistency for 'did' button using proper CSS reset
- Replace Font Awesome spinners with yellow color (#fff700) for consistency
- Implement holographic card effects for special status cards (yui, first, etc.)
- Add cached user data loading from /json/users.json for faster initial load
- Fix loading states to show spinners instead of "User not found" messages
- Clean up debug console logs for production readiness
- Add proper error handling for API calls
- Update CSS imports to use local files from /pkg/ directory

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

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

public/pkg/font-awesome/svgs/brands/square-font-awesome-stroke.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.5.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2024 Fonticons, Inc. --><path d="M64 64C46.3 64 32 78.3 32 96l0 320c0 17.7 14.3 32 32 32l320 0c17.7 0 32-14.3 32-32l0-320c0-17.7-14.3-32-32-32L64 64zM0 96C0 60.7 28.7 32 64 32l320 0c35.3 0 64 28.7 64 64l0 320c0 35.3-28.7 64-64 64L64 480c-35.3 0-64-28.7-64-64L0 96zm154 58c0 9.3-4.8 17.4-12.1 22l188.9 0c7.3 0 13.2 5.9 13.2 13.2c0 1.8-.4 3.7-1.1 5.4L312 264l30.9 69.4c.8 1.7 1.1 3.5 1.1 5.4c0 7.3-5.9 13.2-13.2 13.2L144 352l0 32-32 0 0-32 0-176 0-1.5c-6.1-4.8-10-12.2-10-20.5c0-14.4 11.6-26 26-26s26 11.6 26 26z"/></svg>