feat(planner): add MealActionSheet component for mobile swap trigger

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

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

@@ -0,0 +1,79 @@
+import { describe, it, expect, vi } from 'vitest';
+import { render, screen } from '@testing-library/svelte';
+import { userEvent } from '@testing-library/user-event';
+import MealActionSheet from './MealActionSheet.svelte';
+
+const slot = {
+	id: 's1',
+	slotDate: '2026-04-08',
+	recipe: { id: 'r1', name: 'Tomato pasta', effort: 'easy', cookTimeMin: 45 }
+};
+
+const baseProps = {
+	open: true,
+	slot,
+	onswap: vi.fn(),
+	oncancel: vi.fn()
+};
+
+describe('MealActionSheet', () => {
+	it('renders meal title', () => {
+		render(MealActionSheet, { props: baseProps });
+		expect(screen.getByText('Tomato pasta')).toBeTruthy();
+	});
+
+	it('renders meal metadata', () => {
+		render(MealActionSheet, { props: baseProps });
+		expect(screen.getByText(/45 min/i)).toBeTruthy();
+		expect(screen.getByText(/easy/i)).toBeTruthy();
+	});
+
+	it('renders all 4 action buttons', () => {
+		render(MealActionSheet, { props: baseProps });
+		expect(screen.getByRole('button', { name: /Swap this meal/i })).toBeTruthy();
+		expect(screen.getByRole('link', { name: /Cook now/i })).toBeTruthy();
+		expect(screen.getByRole('link', { name: /View recipe/i })).toBeTruthy();
+		expect(screen.getByRole('button', { name: /Cancel/i })).toBeTruthy();
+	});
+
+	it('Cook now links to the cook route', () => {
+		render(MealActionSheet, { props: baseProps });
+		const link = screen.getByRole('link', { name: /Cook now/i });
+		expect(link.getAttribute('href')).toBe('/recipes/r1/cook');
+	});
+
+	it('View recipe links to the recipe detail route', () => {
+		render(MealActionSheet, { props: baseProps });
+		const link = screen.getByRole('link', { name: /View recipe/i });
+		expect(link.getAttribute('href')).toBe('/recipes/r1');
+	});
+
+	it('clicking Swap this meal calls onswap', async () => {
+		const onswap = vi.fn();
+		const user = userEvent.setup();
+		render(MealActionSheet, { props: { ...baseProps, onswap } });
+		await user.click(screen.getByRole('button', { name: /Swap this meal/i }));
+		expect(onswap).toHaveBeenCalledOnce();
+	});
+
+	it('clicking Cancel calls oncancel', async () => {
+		const oncancel = vi.fn();
+		const user = userEvent.setup();
+		render(MealActionSheet, { props: { ...baseProps, oncancel } });
+		await user.click(screen.getByRole('button', { name: /Cancel/i }));
+		expect(oncancel).toHaveBeenCalledOnce();
+	});
+
+	it('clicking backdrop calls oncancel', async () => {
+		const oncancel = vi.fn();
+		const user = userEvent.setup();
+		render(MealActionSheet, { props: { ...baseProps, oncancel } });
+		await user.click(screen.getByTestId('sheet-backdrop'));
+		expect(oncancel).toHaveBeenCalledOnce();
+	});
+
+	it('does not render when open is false', () => {
+		render(MealActionSheet, { props: { ...baseProps, open: false } });
+		expect(screen.queryByText('Tomato pasta')).toBeNull();
+	});
+});