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/scss/_core.scss

@@ -0,0 +1,43 @@
+// base icon class definition
+// -------------------------
+
+.#{$fa-css-prefix} {
+  font-family: var(--#{$fa-css-prefix}-style-family, '#{$fa-style-family}');
+  font-weight: var(--#{$fa-css-prefix}-style, #{$fa-style});
+}
+
+.#{$fa-css-prefix},
+.#{$fa-css-prefix}-classic,
+.#{$fa-css-prefix}-sharp,
+.fas,
+.#{$fa-css-prefix}-solid,
+.far,
+.#{$fa-css-prefix}-regular,
+.fab,
+.#{$fa-css-prefix}-brands {
+  -moz-osx-font-smoothing: grayscale;
+  -webkit-font-smoothing: antialiased;
+  display: var(--#{$fa-css-prefix}-display, #{$fa-display});
+  font-style: normal;
+  font-variant: normal;
+  line-height: 1;
+  text-rendering: auto;
+}
+
+.fas,
+.#{$fa-css-prefix}-classic,
+.#{$fa-css-prefix}-solid,
+.far,
+.#{$fa-css-prefix}-regular {
+  font-family: 'Font Awesome 6 Free';
+}
+
+.fab,
+.#{$fa-css-prefix}-brands {
+  font-family: 'Font Awesome 6 Brands';
+}
+
+
+%fa-icon {
+  @include fa-icon;
+}