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/less/_sizing.less

@@ -0,0 +1,19 @@
+// sizing icons
+// -------------------------
+
+// literal magnification scale
+.sizes-literal(@factor) when (@factor > 0) {
+  .sizes-literal((@factor - 1));
+
+  .@{fa-css-prefix}-@{factor}x {
+    font-size: (@factor * 1em);
+  }
+}
+.sizes-literal(10);
+
+// step-based scale (with alignment)
+each(.fa-sizes(), {
+  .@{fa-css-prefix}-@{key} {
+    .fa-size(@value);
+  }
+});