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/solid/circle-notch.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><!--! 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="M222.7 32.1c5 16.9-4.6 34.8-21.5 39.8C121.8 95.6 64 169.1 64 256c0 106 86 192 192 192s192-86 192-192c0-86.9-57.8-160.4-137.1-184.1c-16.9-5-26.6-22.9-21.5-39.8s22.9-26.6 39.8-21.5C434.9 42.1 512 140 512 256c0 141.4-114.6 256-256 256S0 397.4 0 256C0 140 77.1 42.1 182.9 10.6c16.9-5 34.8 4.6 39.8 21.5z"/></svg>