refactor(staples): convert dynamic userEvent import to static in CategorySection test

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/onboarding/CategorySection.test.ts

@@ -1,5 +1,6 @@
 import { describe, it, expect, vi } from 'vitest';
 import { render, screen } from '@testing-library/svelte';
+import { userEvent } from '@testing-library/user-event';
 import CategorySection from './CategorySection.svelte';
 
 const mockIngredients = [
@@ -34,7 +35,6 @@ describe('CategorySection', () => {
 	});
 
 	it('calls onToggle with ingredient id and new value when chip is clicked', async () => {
-		const { userEvent } = await import('@testing-library/user-event');
 		const user = userEvent.setup();
 		const onToggle = vi.fn();
 		render(CategorySection, {