Fix all tests (vibe-kanban bba3e2c9)

Fixe alle tests. Frage mich, wenn du nicht weißt, was zu tun ist.

app/Models/Notification.php

@@ -3,6 +3,7 @@
 namespace App\Models;
 
 use App\Enums\NewsCategory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Spatie\MediaLibrary\HasMedia;
@@ -10,6 +11,7 @@ use Spatie\MediaLibrary\InteractsWithMedia;
 
 class Notification extends Model implements HasMedia
 {
+    use HasFactory;
     use InteractsWithMedia;
 
     /** @var list<string> */