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/mdb.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 576 512"><!--! 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="M17.37 160.41L7 352h43.91l5.59-79.83L84.43 352h44.71l25.54-77.43 4.79 77.43H205l-12.79-191.59H146.7L106 277.74 63.67 160.41zm281 0h-47.9V352h47.9s95 .8 94.2-95.79c-.78-94.21-94.18-95.78-94.18-95.78zm-1.2 146.46V204.78s46 4.27 46.8 50.57-46.78 51.54-46.78 51.54zm238.29-74.24a56.16 56.16 0 0 0 8-38.31c-5.34-35.76-55.08-34.32-55.08-34.32h-51.9v191.58H482s87 4.79 87-63.85c0-43.14-33.52-55.08-33.52-55.08zm-51.9-31.94s13.57-1.59 16 9.59c1.43 6.66-4 12-4 12h-12v-21.57zm-.1 109.46l.1-24.92V267h.08s41.58-4.73 41.19 22.43c-.33 25.65-41.35 20.74-41.35 20.74z"/></svg>