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/amilia.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="M240.1 32c-61.9 0-131.5 16.9-184.2 55.4-5.1 3.1-9.1 9.2-7.2 19.4 1.1 5.1 5.1 27.4 10.2 39.6 4.1 10.2 14.2 10.2 20.3 6.1 32.5-22.3 96.5-47.7 152.3-47.7 57.9 0 58.9 28.4 58.9 73.1v38.5C203 227.7 78.2 251 46.7 264.2 11.2 280.5 16.3 357.7 16.3 376s15.2 104 124.9 104c47.8 0 113.7-20.7 153.3-42.1v25.4c0 3 2.1 8.2 6.1 9.1 3.1 1 50.7 2 59.9 2s62.5.3 66.5-.7c4.1-1 5.1-6.1 5.1-9.1V168c-.1-80.3-57.9-136-192-136zm50.2 348c-21.4 13.2-48.7 24.4-79.1 24.4-52.8 0-58.9-33.5-59-44.7 0-12.2-3-42.7 18.3-52.9 24.3-13.2 75.1-29.4 119.8-33.5z"/></svg>