test(planner): verify mobile swap sheet triggers suggestion fetch

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

frontend/src/routes/(app)/planner/page.test.ts

@@ -93,6 +93,26 @@ describe('+page.svelte — $effect suggestion fetch', () => {
 	});
 });
 
+describe('+page.svelte — swap sheet suggestion fetch', () => {
+	afterEach(() => {
+		vi.restoreAllMocks();
+	});
+
+	it('opening mobile swap sheet triggers fetch with planId and date', async () => {
+		vi.stubGlobal('fetch', vi.fn().mockResolvedValue({ json: () => Promise.resolve({ suggestions: [] }) }));
+
+		render(Page, { props: { data: mockDataWithSlot } });
+
+		// Open action sheet, then swap sheet
+		await userEvent.click(screen.getByTestId('day-meal-card'));
+		await userEvent.click(await screen.findByRole('button', { name: /Gericht tauschen/i }));
+
+		await waitFor(() => expect(fetch).toHaveBeenCalledTimes(1));
+		expect((fetch as any).mock.calls[0][0]).toContain(`planId=${PLAN_ID}`);
+		expect((fetch as any).mock.calls[0][0]).toContain(`date=${DATE}`);
+	});
+});
+
 describe('+page.svelte — remove meal', () => {
 	afterEach(() => {
 		vi.restoreAllMocks();