fix(stammbaum): state-aware aria-label on family-member toggle — WCAG accessible name

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

frontend/messages/de.json

@@ -965,6 +965,8 @@
 	"relation_year_to": "bis {year}",
 	"relation_year_error_bis_before_von": "Bis-Jahr darf nicht vor Von-Jahr liegen.",
 	"relation_label_family_member": "Als Familienmitglied",
+	"relation_toggle_add_to_tree": "Zum Stammbaum hinzufügen",
+	"relation_toggle_remove_from_tree": "Aus Stammbaum entfernen",
 	"relation_label_in_tree": "Erscheint im Stammbaum",
 	"relation_label_view_in_tree": "Ansehen →",
 	"relation_label_direct": "Direkte Beziehungen",

frontend/messages/en.json

@@ -965,6 +965,8 @@
 	"relation_year_to": "until {year}",
 	"relation_year_error_bis_before_von": "End year must not precede start year.",
 	"relation_label_family_member": "Family member",
+	"relation_toggle_add_to_tree": "Add to family tree",
+	"relation_toggle_remove_from_tree": "Remove from family tree",
 	"relation_label_in_tree": "Appears in the family tree",
 	"relation_label_view_in_tree": "View →",
 	"relation_label_direct": "Direct relationships",

frontend/messages/es.json

@@ -965,6 +965,8 @@
 	"relation_year_to": "hasta {year}",
 	"relation_year_error_bis_before_von": "El año final no puede ser anterior al año inicial.",
 	"relation_label_family_member": "Miembro de la familia",
+	"relation_toggle_add_to_tree": "Añadir al árbol genealógico",
+	"relation_toggle_remove_from_tree": "Quitar del árbol genealógico",
 	"relation_label_in_tree": "Aparece en el árbol genealógico",
 	"relation_label_view_in_tree": "Ver →",
 	"relation_label_direct": "Relaciones directas",

frontend/src/lib/components/StammbaumCard.svelte

@@ -76,6 +76,9 @@ function yearRange(rel: RelationshipDTO): string {
 					type="submit"
 					role="switch"
 					aria-checked={familyMember}
+					aria-label={familyMember
+						? m.relation_toggle_remove_from_tree()
+						: m.relation_toggle_add_to_tree()}
 					class="inline-flex items-center gap-2 font-sans text-xs font-medium text-ink-2 transition-colors hover:text-ink"
 				>
 					<span

frontend/src/lib/components/StammbaumCard.svelte.spec.ts

@@ -37,4 +37,18 @@ describe('StammbaumCard', () => {
 		render(StammbaumCard, { ...baseProps, relationshipError: 'Test Fehler' });
 		await expect.element(page.getByText('Test Fehler')).toBeInTheDocument();
 	});
+
+	it('toggle aria-label says "Zum Stammbaum hinzufügen" when not yet a family member', async () => {
+		render(StammbaumCard, { ...baseProps, canWrite: true, familyMember: false });
+		await expect
+			.element(page.getByRole('switch', { name: 'Zum Stammbaum hinzufügen' }))
+			.toBeInTheDocument();
+	});
+
+	it('toggle aria-label says "Aus Stammbaum entfernen" when already a family member', async () => {
+		render(StammbaumCard, { ...baseProps, canWrite: true, familyMember: true });
+		await expect
+			.element(page.getByRole('switch', { name: 'Aus Stammbaum entfernen' }))
+			.toBeInTheDocument();
+	});
 });