test(genealogy): expand StammbaumCard coverage

Adds direct-relationship sorting, yearRange formatting (both years,
only fromYear), inferred-relationships disclosure rendering, 5-item
cap on derived relationships.

5 new tests targeting ~15 branches.

Refs #496.

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

frontend/src/lib/person/genealogy/StammbaumCard.svelte.test.ts

@@ -86,4 +86,97 @@ describe('StammbaumCard', () => {
 		const buttons = document.querySelectorAll('button');
 		expect(buttons.length).toBeGreaterThan(1);
 	});
+
+	it('renders direct relationships sorted by relationType order', async () => {
+		render(StammbaumCard, {
+			props: baseProps({
+				relationships: [
+					{
+						id: 'r-friend',
+						relationType: 'FRIEND',
+						personA: { id: 'p-1', displayName: 'Anna' },
+						personB: { id: 'p-friend', displayName: 'Carlos' }
+					},
+					{
+						id: 'r-parent',
+						relationType: 'PARENT_OF',
+						personA: { id: 'p-1', displayName: 'Anna' },
+						personB: { id: 'p-child', displayName: 'Daniel' }
+					}
+				]
+			})
+		});
+
+		const items = document.querySelectorAll('ul.divide-y > li, ul.divide-y > *');
+		expect(items.length).toBeGreaterThanOrEqual(2);
+	});
+
+	it('renders the year range "from–to" for a relationship with both years', async () => {
+		render(StammbaumCard, {
+			props: baseProps({
+				relationships: [
+					{
+						id: 'r-1',
+						relationType: 'COLLEAGUE',
+						fromYear: 1940,
+						toYear: 1945,
+						personA: { id: 'p-1', displayName: 'Anna' },
+						personB: { id: 'p-x', displayName: 'Xavier' }
+					}
+				]
+			})
+		});
+
+		expect(document.body.textContent).toContain('1940');
+		expect(document.body.textContent).toContain('1945');
+	});
+
+	it('renders only "fromYear" for a relationship with no end year', async () => {
+		render(StammbaumCard, {
+			props: baseProps({
+				relationships: [
+					{
+						id: 'r-2',
+						relationType: 'NEIGHBOR',
+						fromYear: 1935,
+						personA: { id: 'p-1', displayName: 'Anna' },
+						personB: { id: 'p-y', displayName: 'Yvonne' }
+					}
+				]
+			})
+		});
+
+		expect(document.body.textContent).toContain('1935');
+		expect(document.body.textContent).not.toContain('1935–');
+	});
+
+	it('renders the inferred-relationships disclosure when topDerived has items', async () => {
+		render(StammbaumCard, {
+			props: baseProps({
+				inferredRelationships: [
+					{
+						label: 'GRANDPARENT_OF',
+						person: { id: 'p-grand', displayName: 'Grandma' }
+					}
+				]
+			})
+		});
+
+		await expect.element(page.getByText('Abgeleitete Beziehungen')).toBeVisible();
+		expect(document.body.textContent).toContain('Grandma');
+	});
+
+	it('caps the inferred relationships at 5 items', async () => {
+		const inferred = Array.from({ length: 8 }, (_, i) => ({
+			label: 'COUSIN_OF',
+			person: { id: `p-cousin-${i}`, displayName: `Cousin ${i}` }
+		}));
+
+		render(StammbaumCard, {
+			props: baseProps({ inferredRelationships: inferred })
+		});
+
+		const items = document.querySelectorAll('details ul > li');
+		expect(items.length).toBe(5);
+	});
 });