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/shop.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 640 512"><!--! 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="M36.8 192H603.2c20.3 0 36.8-16.5 36.8-36.8c0-7.3-2.2-14.4-6.2-20.4L558.2 21.4C549.3 8 534.4 0 518.3 0H121.7c-16 0-31 8-39.9 21.4L6.2 134.7c-4 6.1-6.2 13.2-6.2 20.4C0 175.5 16.5 192 36.8 192zM64 224V384v80c0 26.5 21.5 48 48 48H336c26.5 0 48-21.5 48-48V384 224H320V384H128V224H64zm448 0V480c0 17.7 14.3 32 32 32s32-14.3 32-32V224H512z"/></svg>