test(planner): clear shared mocks before each RecipePickerDrawer test

Adds beforeEach(vi.clearAllMocks) to prevent shared vi.fn() state in
baseProps from leaking across tests.

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

frontend/src/lib/planner/RecipePickerDrawer.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect, vi } from 'vitest';
+import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { render, screen } from '@testing-library/svelte';
 import { userEvent } from '@testing-library/user-event';
 import RecipePickerDrawer from './RecipePickerDrawer.svelte';
@@ -18,6 +18,7 @@ const baseProps = {
 };
 
 describe('RecipePickerDrawer', () => {
+	beforeEach(() => vi.clearAllMocks());
 	describe('visibility', () => {
 		it('renders drawer content when open=true', () => {
 			render(RecipePickerDrawer, { props: baseProps });