fix: Use username field instead of display_name in profile

- Updated profile-actions.ts to use username column
- Updated ProfileForm.tsx to use username
- Updated settings page to pass username
- Matches database schema (profiles.username)

src/app/settings/page.tsx

@@ -44,7 +44,7 @@ export default async function SettingsPage() {
                 <ProfileForm
                     initialData={{
                         email: profile?.email,
-                        display_name: profile?.display_name,
+                        username: profile?.username,
                     }}
                 />
 

src/components/ProfileForm.tsx

@@ -8,12 +8,12 @@ import { updateProfile } from '@/services/profile-actions';
 interface ProfileFormProps {
     initialData: {
         email?: string;
-        display_name?: string | null;
+        username?: string | null;
     };
 }
 
 export default function ProfileForm({ initialData }: ProfileFormProps) {
-    const [displayName, setDisplayName] = useState(initialData.display_name || '');
+    const [username, setUsername] = useState(initialData.username || '');
     const [isPending, startTransition] = useTransition();
     const [status, setStatus] = useState<'idle' | 'success' | 'error'>('idle');
     const [error, setError] = useState<string | null>(null);
@@ -24,7 +24,7 @@ export default function ProfileForm({ initialData }: ProfileFormProps) {
         setError(null);
 
         const formData = new FormData();
-        formData.set('display_name', displayName);
+        formData.set('username', username);
 
         startTransition(async () => {
             const result = await updateProfile(formData);
@@ -66,16 +66,16 @@ export default function ProfileForm({ initialData }: ProfileFormProps) {
                     <p className="mt-1 text-xs text-zinc-500">E-Mail kann nicht geändert werden</p>
                 </div>
 
-                {/* Display Name */}
+                {/* Username */}
                 <div>
                     <label className="block text-sm font-medium text-zinc-400 mb-2">
-                        Anzeigename
+                        Benutzername
                     </label>
                     <input
                         type="text"
-                        value={displayName}
-                        onChange={(e) => setDisplayName(e.target.value)}
-                        placeholder="Dein Name"
+                        value={username}
+                        onChange={(e) => setUsername(e.target.value)}
+                        placeholder="Dein Benutzername"
                         className="w-full px-4 py-3 bg-zinc-800 border border-zinc-700 rounded-xl text-white placeholder-zinc-500 focus:outline-none focus:ring-2 focus:ring-orange-500 focus:border-transparent"
                     />
                 </div>

src/services/profile-actions.ts

@@ -20,13 +20,13 @@ export async function updateProfile(formData: FormData): Promise<ProfileUpdateRe
             return { success: false, error: 'Nicht autorisiert' };
         }
 
-        const displayName = formData.get('display_name') as string;
+        const username = formData.get('username') as string;
 
         const { error } = await supabase
             .from('profiles')
             .upsert({
                 id: user.id,
-                display_name: displayName?.trim() || null,
+                username: username?.trim() || null,
                 updated_at: new Date().toISOString(),
             });
 
@@ -98,14 +98,14 @@ export async function getProfile() {
 
         const { data: profile } = await supabase
             .from('profiles')
-            .select('id, display_name, avatar_url, created_at, updated_at')
+            .select('id, username, avatar_url, updated_at')
             .eq('id', user.id)
             .single();
 
         return {
             id: user.id,
             email: user.email,
-            display_name: profile?.display_name || null,
+            username: profile?.username || null,
             avatar_url: profile?.avatar_url || null,
             created_at: user.created_at,
         };