feat: add user display name field (#898)

Co-authored-by: Elias Schneider <login@eliasschneider.com>

frontend/src/lib/components/signup/signup-form.svelte

@@ -5,6 +5,7 @@
 	import { preventDefault } from '$lib/utils/event-util';
 	import { createForm } from '$lib/utils/form-util';
 	import { tryCatch } from '$lib/utils/try-catch-util';
+	import { emptyToUndefined } from '$lib/utils/zod-util';
 	import { z } from 'zod/v4';
 
 	let {
@@ -24,7 +25,7 @@
 
 	const formSchema = z.object({
 		firstName: z.string().min(1).max(50),
-		lastName: z.string().max(50).optional(),
+		lastName: emptyToUndefined(z.string().max(50).optional()),
 		username: z
 			.string()
 			.min(2)

frontend/src/lib/types/application-configuration.ts

@@ -41,6 +41,7 @@ export type AllAppConfig = AppConfig & {
 	ldapAttributeUserEmail: string;
 	ldapAttributeUserFirstName: string;
 	ldapAttributeUserLastName: string;
+	ldapAttributeUserDisplayName: string;
 	ldapAttributeUserProfilePicture: string;
 	ldapAttributeGroupMember: string;
 	ldapAttributeGroupUniqueIdentifier: string;

frontend/src/lib/types/user.type.ts

@@ -8,6 +8,7 @@ export type User = {
 	email: string;
 	firstName: string;
 	lastName?: string;
+	displayName: string;
 	isAdmin: boolean;
 	userGroups: UserGroup[];
 	customClaims: CustomClaim[];
@@ -18,6 +19,6 @@ export type User = {
 
 export type UserCreate = Omit<User, 'id' | 'customClaims' | 'ldapId' | 'userGroups'>;
 
-export type UserSignUp = Omit<UserCreate, 'isAdmin' | 'disabled'> & {
+export type UserSignUp = Omit<UserCreate, 'isAdmin' | 'disabled' | 'displayName'> & {
 	token?: string;
 };

frontend/src/lib/utils/locale.util.ts

@@ -1,8 +1,19 @@
-import { setLocale as setParaglideLocale, type Locale } from '$lib/paraglide/runtime';
+import {
+	extractLocaleFromCookie,
+	setLocale as setParaglideLocale,
+	type Locale
+} from '$lib/paraglide/runtime';
 import { setDefaultOptions } from 'date-fns';
 import { z } from 'zod/v4';
 
 export async function setLocale(locale: Locale, reload = true) {
+	await setLocaleForLibraries(locale);
+	setParaglideLocale(locale, { reload });
+}
+
+export async function setLocaleForLibraries(
+	locale: Locale = (extractLocaleFromCookie() as Locale) || 'en'
+) {
 	const [zodResult, dateFnsResult] = await Promise.allSettled([
 		import(`../../../node_modules/zod/v4/locales/${locale}.js`),
 		import(`../../../node_modules/date-fns/locale/${locale}.js`)
@@ -14,8 +25,6 @@ export async function setLocale(locale: Locale, reload = true) {
 		console.warn(`Failed to load zod locale for ${locale}:`, zodResult.reason);
 	}
 
-	setParaglideLocale(locale, { reload });
-
 	if (dateFnsResult.status === 'fulfilled') {
 		setDefaultOptions({
 			locale: dateFnsResult.value.default

frontend/src/lib/utils/zod-util.ts

@@ -1,8 +1,8 @@
 import { m } from '$lib/paraglide/messages';
-import z from 'zod/v4';
+import { z } from 'zod/v4';
 
 export const emptyToUndefined = <T>(validation: z.ZodType<T>) =>
-	z.preprocess((v) => (v === '' ? undefined : v), validation);
+	z.preprocess((v) => (v === '' ? undefined : v), validation.optional());
 
 export const optionalUrl = z
 	.url()