feat(geschichten): chip-row UI for multi-person AND filter

The /geschichten list page now renders one removable chip per active
person filter and lets users add more via the existing typeahead. The
URL uses repeated ?personId= params (matching the documents tag
filter), which the regenerated API client passes straight through to
the backend's new array-bound endpoint. New translation keys cover the
chip remove aria-label, the AND hint shown while picking, and the
multi-person empty state.

frontend/src/routes/geschichten/+page.server.ts

@@ -1,26 +1,27 @@
 import { error } from '@sveltejs/kit';
 import { createApiClient } from '$lib/api.server';
 import { getErrorMessage } from '$lib/errors';
+import type { components } from '$lib/generated/api';
 import type { PageServerLoad } from './$types';
 
+type Person = components['schemas']['Person'];
+
 export const load: PageServerLoad = async ({ url, fetch }) => {
 	const api = createApiClient(fetch);
-	const personId = url.searchParams.get('personId') ?? undefined;
+	const personIds = url.searchParams.getAll('personId');
 	const documentId = url.searchParams.get('documentId') ?? undefined;
 
-	const [listResult, personResult] = await Promise.all([
+	const [listResult, ...personResults] = await Promise.all([
 		api.GET('/api/geschichten', {
 			params: {
 				query: {
 					status: 'PUBLISHED',
-					personId,
+					personId: personIds.length ? personIds : undefined,
 					documentId
 				}
 			}
 		}),
-		personId
-			? api.GET('/api/persons/{id}', { params: { path: { id: personId } } })
-			: Promise.resolve(null)
+		...personIds.map((id) => api.GET('/api/persons/{id}', { params: { path: { id } } }))
 	]);
 
 	if (!listResult.response.ok) {
@@ -28,9 +29,13 @@ export const load: PageServerLoad = async ({ url, fetch }) => {
 		throw error(listResult.response.status, getErrorMessage(code));
 	}
 
+	const personFilters = personResults
+		.filter((r) => r && r.response.ok && r.data)
+		.map((r) => r!.data!) as Person[];
+
 	return {
 		geschichten: listResult.data ?? [],
-		personFilter: personResult && personResult.response.ok ? personResult.data! : null,
+		personFilters,
 		documentFilter: documentId ?? null
 	};
 };