refactor(frontend): regen API types — migrate consumers off dropped Geschichte schema

With create/update returning GeschichteView, no endpoint serves the raw
Geschichte entity and springdoc drops its schema. Dashboard modules and the
home loader now use GeschichteSummary; GeschichteEditor takes GeschichteView
and maps persons into the displayName shape PersonMultiSelect renders —
fixing blank person chips on story edit. PersonMultiSelect/Sidebar narrow to
Pick<Person, 'id' | 'displayName'>, mirroring the DocumentOption precedent.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/lib/geschichte/GeschichteSidebar.svelte

@@ -4,10 +4,11 @@ import type { components } from '$lib/generated/api';
 import PersonMultiSelect from '$lib/person/PersonMultiSelect.svelte';
 
 type Person = components['schemas']['Person'];
+type PersonOption = Pick<Person, 'id' | 'displayName'>;
 
 interface Props {
 	status: 'DRAFT' | 'PUBLISHED';
-	selectedPersons: Person[];
+	selectedPersons: PersonOption[];
 }
 
 let { status, selectedPersons = $bindable() }: Props = $props();