test(search): cover smart-mode chip lifecycle hooks (#739)

SearchFilterBar drives chip-clearing via onModeToggle (mode switch) and
onSmartSearch (new query); pin that callback contract.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/routes/SearchFilterBar.svelte.spec.ts

@@ -195,3 +195,39 @@ describe('SearchFilterBar – tagQ live filter', () => {
 		vi.unstubAllGlobals();
 	});
 });
+
+describe('SearchFilterBar – smart-mode chip lifecycle hooks', () => {
+	// The interpretation chips live in the result area (parent page). SearchFilterBar
+	// drives chip-clearing through callbacks: onModeToggle (mode switch) and
+	// onSmartSearch (new query). These tests pin that contract.
+	it('invokes onModeToggle when toggling back to keyword mode (parent clears chips)', async () => {
+		const onModeToggle = vi.fn();
+		render(SearchFilterBar, {
+			...defaultProps,
+			sort: 'DATE',
+			dir: 'desc',
+			smartMode: true,
+			onModeToggle
+		});
+		await page.getByRole('button', { name: /KI/ }).click();
+		expect(onModeToggle).toHaveBeenCalledOnce();
+	});
+
+	it('invokes onSmartSearch when a new query is submitted in smart mode (parent resets chips)', async () => {
+		const onSmartSearch = vi.fn();
+		render(SearchFilterBar, {
+			...defaultProps,
+			sort: 'DATE',
+			dir: 'desc',
+			smartMode: true,
+			onSmartSearch
+		});
+		const input = page.getByPlaceholder('Titel, Personen, Tags durchsuchen…');
+		await input.fill('Walter im Krieg');
+		await input.click();
+		(document.activeElement as HTMLElement).dispatchEvent(
+			new KeyboardEvent('keydown', { key: 'Enter', bubbles: true })
+		);
+		await vi.waitFor(() => expect(onSmartSearch).toHaveBeenCalled());
+	});
+});