Fix UserForm 500: use name_ar column instead of non-existent first_name_ar/last_name_ar

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

app/Livewire/Users/UserForm.php

@@ -108,9 +108,9 @@ public function render()
     {
         return view('livewire.users.user-form', [
             'roles' => Role::orderBy('level', 'desc')->get(['id', 'name_ar', 'slug']),
-            'people' => Person::orderBy('first_name_ar')
-                ->get(['id', 'first_name_ar', 'last_name_ar'])
-                ->map(fn ($p) => ['id' => $p->id, 'name' => "{$p->first_name_ar} {$p->last_name_ar}"]),
+            'people' => Person::orderBy('name_ar')
+                ->get(['id', 'name_ar'])
+                ->map(fn ($p) => ['id' => $p->id, 'name' => $p->name_ar]),
         ]);
     }
 }