Rename shared-ui to ui-design-system

- More descriptive name for design system library
- Update all imports and configurations
- No functional changes

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

projects/demo-ui-essentials/src/app/demos/menu-demo/menu-demo.component.scss

@@ -1,4 +1,4 @@
-@use "../../../../../shared-ui/src/styles/tokens" as *;
+@use "../../../../../ui-design-system/src/styles/tokens" as *;
 
 // Tokens available globally via main application styles