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/square-tumblr.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="M448 96c0-35.3-28.7-64-64-64H64C28.7 32 0 60.7 0 96V416c0 35.3 28.7 64 64 64H384c35.3 0 64-28.7 64-64V96zM256.8 416c-75.5 0-91.9-55.5-91.9-87.9v-90H135.2c-3.4 0-6.2-2.8-6.2-6.2V189.4c0-4.5 2.8-8.5 7.1-10c38.8-13.7 50.9-47.5 52.7-73.2c.5-6.9 4.1-10.2 10-10.2h44.3c3.4 0 6.2 2.8 6.2 6.2v72h51.9c3.4 0 6.2 2.8 6.2 6.2v51.1c0 3.4-2.8 6.2-6.2 6.2H249.1V321c0 21.4 14.8 33.5 42.5 22.4c3-1.2 5.6-2 8-1.4c2.2 .5 3.6 2.1 4.6 4.9L318 387.1c1 3.2 2 6.7-.3 9.1c-8.5 9.1-31.2 19.8-60.9 19.8z"/></svg>