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/red-river.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="M353.2 32H94.8C42.4 32 0 74.4 0 126.8v258.4C0 437.6 42.4 480 94.8 480h258.4c52.4 0 94.8-42.4 94.8-94.8V126.8c0-52.4-42.4-94.8-94.8-94.8zM144.9 200.9v56.3c0 27-21.9 48.9-48.9 48.9V151.9c0-13.2 10.7-23.9 23.9-23.9h154.2c0 27-21.9 48.9-48.9 48.9h-56.3c-12.3-.6-24.6 11.6-24 24zm176.3 72h-56.3c-12.3-.6-24.6 11.6-24 24v56.3c0 27-21.9 48.9-48.9 48.9V247.9c0-13.2 10.7-23.9 23.9-23.9h154.2c0 27-21.9 48.9-48.9 48.9z"/></svg>