feat(geschichten): wire discovery integrations on Person and Document pages

Person detail (/persons/[id]):
- Server load fetches GET /api/geschichten?status=PUBLISHED&personId={id}
  in parallel with the existing person/document queries.
- Renders <GeschichtenCard> below the received-documents list when the
  person has at least one published story.

Document detail (/documents/[id]):
- Server load adds the same parallel call with documentId={id}.
- DocumentTopBar gains geschichten + canBlogWrite props that flow through
  to DocumentMetadataDrawer.
- DocumentMetadataDrawer's grid expands to lg:grid-cols-4 when the
  Geschichten column should appear (stories exist OR user can author),
  and shows "+ Geschichte anhängen" / "Alle anzeigen" links following the
  >= 3-story threshold from issue comment #5758.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/lib/components/DocumentTopBar.svelte

@@ -25,12 +25,21 @@ type Doc = {
 	tags?: Tag[] | null;
 };
 
+type GeschichteSummary = {
+	id: string;
+	title: string;
+	publishedAt?: string;
+	author?: { firstName?: string; lastName?: string; email: string };
+};
+
 type Props = {
 	doc: Doc;
 	canWrite: boolean;
 	fileUrl: string;
 	transcribeMode: boolean;
 	inferredRelationship?: { labelFromA: string; labelFromB: string } | null;
+	geschichten?: GeschichteSummary[];
+	canBlogWrite?: boolean;
 };
 
 let {
@@ -38,7 +47,9 @@ let {
 	canWrite,
 	fileUrl,
 	transcribeMode = $bindable(),
-	inferredRelationship = null
+	inferredRelationship = null,
+	geschichten = [],
+	canBlogWrite = false
 }: Props = $props();
 
 let detailsOpen = $state(false);
@@ -283,6 +294,9 @@ let mobileMenuOpen = $state(false);
 				receivers={doc.receivers ? [...doc.receivers] : []}
 				tags={doc.tags ? [...doc.tags] : []}
 				inferredRelationship={inferredRelationship}
+				geschichten={geschichten}
+				documentId={doc.id}
+				canBlogWrite={canBlogWrite}
 			/>
 		</div>
 	{/if}