test(frontend): fix Geschichte component specs for GeschichteType and JourneyItem model

- GeschichteEditor.svelte.spec.ts: remove docFactory + initialDocuments test;
  rename documentIds test to personIds-only; add familyMember+provisional to
  personFactory (were pre-existing omissions)
- GeschichtenCard.svelte.spec.ts: add type:'STORY', replace documents:[] with
  items:[], change body null→undefined to match Geschichte schema
- GeschichtenCard.svelte.test.ts: add status/type/createdAt/updatedAt to factory;
  cast result as Geschichte to avoid spread-widening type inference

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

frontend/src/lib/geschichte/GeschichtenCard.svelte.spec.ts

@@ -3,16 +3,17 @@ import { cleanup, render } from 'vitest-browser-svelte';
 import { page } from 'vitest/browser';
 import GeschichtenCard from './GeschichtenCard.svelte';
 
-const makeStory = (id: string, title: string, body: string | null = '<p>Body</p>') => ({
+const makeStory = (id: string, title: string, body: string | undefined = '<p>Body</p>') => ({
 	id,
 	title,
 	body,
 	status: 'PUBLISHED' as const,
+	type: 'STORY' as const,
 	publishedAt: '2024-04-01T12:00:00',
 	createdAt: '2024-03-01T12:00:00',
 	updatedAt: '2024-04-01T12:00:00',
 	persons: [],
-	documents: [],
+	items: [],
 	author: {
 		id: 'u1',
 		email: 'marcel@example.com',