feat: enhance admin UI with responsive styles and new components

- Updated styles in src/styles.css for better responsiveness and layout adjustments.
- Added new CSS classes for edit drawer and item rail components.
- Introduced animations for drawer transitions.
- Created new types in src/types/admin.ts for better type safety in admin features.
- Modified vite.config.ts to change server port and enable strict port settings for development.

src/components/admin/EmptyState.tsx

@@ -0,0 +1,3 @@
+export function EmptyState({ text }: { text: string }) {
+  return <div className="empty-state">{text}</div>;
+}