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/shared/dashboard/ReaderDraftsModule.svelte

@@ -3,10 +3,10 @@ import * as m from '$lib/paraglide/messages.js';
 import { relativeTimeDe } from '$lib/shared/relativeTime';
 import type { components } from '$lib/generated/api';
 
-type Geschichte = components['schemas']['Geschichte'];
+type GeschichteSummary = components['schemas']['GeschichteSummary'];
 
 interface Props {
-	drafts: Geschichte[];
+	drafts: GeschichteSummary[];
 }
 
 const { drafts }: Props = $props();