refactor(person): one author-name fallback, localized

joinNameOrUnknown()/unknownPersonName() in personFormat.ts replace the
three hand-rolled '[Unbekannt]' literals (geschichte/utils,
GeschichtenCard, personOption) — the fallback is now the i18n key
person_unknown (de/en/es), and formatAuthorDisplayName localizes the
server-side literal on the pass-through path.

Review round 3: Felix, Markus, Leonie (7).

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

frontend/messages/de.json

@@ -1214,8 +1214,10 @@
 	"error_journey_note_too_long": "Die Notiz ist zu lang (maximal 2000 Zeichen).",
 	"error_geschichte_title_too_long": "Der Titel ist zu lang (maximal 255 Zeichen).",
 	"error_geschichte_intro_too_long": "Die Einleitung ist zu lang (maximal 4000 Zeichen).",
+	"person_unknown": "[Unbekannt]",
 	"error_geschichte_title_too_long": "Der Titel ist zu lang (maximal 255 Zeichen).",
 	"error_geschichte_intro_too_long": "Die Einleitung ist zu lang (maximal 4000 Zeichen).",
+	"person_unknown": "[Unbekannt]",
 	"error_journey_document_already_added": "Dieser Brief ist bereits in der Lesereise enthalten.",
 	"error_geschichte_type_immutable": "Der Typ einer Geschichte kann nach der Erstellung nicht mehr geändert werden."
 }

frontend/messages/en.json

@@ -1214,8 +1214,10 @@
 	"error_journey_note_too_long": "The note is too long (maximum 2000 characters).",
 	"error_geschichte_title_too_long": "The title is too long (maximum 255 characters).",
 	"error_geschichte_intro_too_long": "The introduction is too long (maximum 4000 characters).",
+	"person_unknown": "[Unknown]",
 	"error_geschichte_title_too_long": "The title is too long (maximum 255 characters).",
 	"error_geschichte_intro_too_long": "The introduction is too long (maximum 4000 characters).",
+	"person_unknown": "[Unknown]",
 	"error_journey_document_already_added": "This letter is already included in the reading journey.",
 	"error_geschichte_type_immutable": "The type of a story cannot be changed after creation."
 }

frontend/messages/es.json

@@ -1214,8 +1214,10 @@
 	"error_journey_note_too_long": "La nota es demasiado larga (máximo 2000 caracteres).",
 	"error_geschichte_title_too_long": "El título es demasiado largo (máximo 255 caracteres).",
 	"error_geschichte_intro_too_long": "La introducción es demasiado larga (máximo 4000 caracteres).",
+	"person_unknown": "[Desconocido]",
 	"error_geschichte_title_too_long": "El título es demasiado largo (máximo 255 caracteres).",
 	"error_geschichte_intro_too_long": "La introducción es demasiado larga (máximo 4000 caracteres).",
+	"person_unknown": "[Desconocido]",
 	"error_journey_document_already_added": "Esta carta ya está incluida en el viaje de lectura.",
 	"error_geschichte_type_immutable": "El tipo de una historia no se puede cambiar después de su creación."
 }

frontend/src/lib/geschichte/GeschichtenCard.svelte

@@ -3,6 +3,7 @@ import { m } from '$lib/paraglide/messages.js';
 import type { components } from '$lib/generated/api';
 import { plainExcerpt } from '$lib/shared/utils/extractText';
 import { formatDate } from '$lib/shared/utils/date';
+import { formatAuthorName } from './utils';
 
 type GeschichteSummary = components['schemas']['GeschichteSummary'];
 
@@ -24,10 +25,7 @@ function formatPublishedDate(g: GeschichteSummary): string | null {
 }
 
 function authorName(g: GeschichteSummary): string {
-	const a = g.author;
-	if (!a) return '';
-	const full = [a.firstName, a.lastName].filter(Boolean).join(' ').trim();
-	return full || '[Unbekannt]';
+	return formatAuthorName(g.author);
 }
 </script>
 

frontend/src/lib/geschichte/utils.ts

@@ -1,5 +1,6 @@
 import { formatDate } from '$lib/shared/utils/date';
 import { m } from '$lib/paraglide/messages.js';
+import { joinNameOrUnknown, unknownPersonName } from '$lib/person/personFormat';
 
 type AuthorSummary = { firstName?: string; lastName?: string };
 type DocumentMeta = { documentDate?: string; senderName?: string; receiverName?: string };
@@ -7,13 +8,14 @@ type AuthorView = { displayName: string };
 
 export function formatAuthorName(author: AuthorSummary | null | undefined): string {
 	if (!author) return '';
-	const full = [author.firstName, author.lastName].filter(Boolean).join(' ').trim();
-	// Mirrors the server-side fallback in GeschichteService.toView — email is no longer exposed.
-	return full || '[Unbekannt]';
+	// Email is no longer exposed — names or the localized fallback only.
+	return joinNameOrUnknown(author.firstName, author.lastName);
 }
 
 export function formatAuthorDisplayName(author: AuthorView | null | undefined): string {
-	return author?.displayName ?? '';
+	if (!author) return '';
+	// The server-side fallback is the literal '[Unbekannt]' — localize it here.
+	return author.displayName === '[Unbekannt]' ? unknownPersonName() : author.displayName;
 }
 
 export function formatPublishedAt(

frontend/src/lib/person/personFormat.ts

@@ -1,4 +1,5 @@
 import { formatDate } from '$lib/shared/utils/date';
+import { m } from '$lib/paraglide/messages.js';
 
 type Person = { firstName?: string | null; lastName: string; displayName: string };
 type DocForMeta = {
@@ -17,6 +18,19 @@ function djb2(str: string): number {
 	return Math.abs(hash);
 }
 
+/** Localized fallback when a person has no name parts. */
+export function unknownPersonName(): string {
+	return m.person_unknown();
+}
+
+/**
+ * Single source for the join-names-or-fallback rule. Mirrors the server-side
+ * fallback in GeschichteService.toView (which emits the literal '[Unbekannt]').
+ */
+export function joinNameOrUnknown(firstName?: string | null, lastName?: string | null): string {
+	return [firstName, lastName].filter(Boolean).join(' ').trim() || unknownPersonName();
+}
+
 export function getInitials(name: string): string {
 	const words = name.trim().split(/\s+/).filter(Boolean);
 	if (words.length === 0) return '';

frontend/src/lib/person/personOption.ts

@@ -1,4 +1,5 @@
 import type { components } from '$lib/generated/api';
+import { joinNameOrUnknown } from './personFormat';
 
 type Person = components['schemas']['Person'];
 
@@ -21,6 +22,6 @@ export function toPersonOption(p: {
 }): PersonOption {
 	return {
 		id: p.id,
-		displayName: [p.firstName, p.lastName].filter(Boolean).join(' ') || '[Unbekannt]'
+		displayName: joinNameOrUnknown(p.firstName, p.lastName)
 	};
 }