refactor(geschichte): remove JSDoc what-comments from utils.ts

Function names already communicate intent. Comments that restate the
function name add noise without explaining why.

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

frontend/src/lib/geschichte/utils.ts

@@ -3,22 +3,16 @@ import { formatDate } from '$lib/shared/utils/date';
 type AuthorSummary = { firstName?: string; lastName?: string; email: string };
 type AuthorView = { displayName: string };
 
-/** Format an author name from a list summary (firstName + lastName, falling back to email). */
 export function formatAuthorName(author: AuthorSummary | null | undefined): string {
 	if (!author) return '';
 	const full = [author.firstName, author.lastName].filter(Boolean).join(' ').trim();
 	return full || author.email || '';
 }
 
-/** Format an author displayName from a detail view. */
 export function formatAuthorDisplayName(author: AuthorView | null | undefined): string {
 	return author?.displayName ?? '';
 }
 
-/**
- * Format a publishedAt ISO string to a localised date string.
- * Returns null when publishedAt is absent.
- */
 export function formatPublishedAt(
 	publishedAt: string | null | undefined,
 	style: 'short' | 'long' = 'short'