fix(users): pass mobile rule as a nested closure Filament can evaluate

Filament evaluates each entry of ->rules() as its own closure and tries
to inject dependencies, so a bare Laravel validation closure blew up with
"[$attribute] was unresolvable" when opening/saving the user form. Wrap it
so the outer closure returns the Laravel rule.

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

tests/Feature/UserFormMobileTest.php

@@ -0,0 +1,48 @@
+<?php
+
+use App\Filament\Resources\Users\Pages\CreateUser;
+use App\Models\Role;
+use App\Models\User;
+use Filament\Facades\Filament;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+
+use function Pest\Laravel\actingAs;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function (): void {
+    Filament::setCurrentPanel(Filament::getDefaultPanel());
+    $admin = User::factory()->create();
+    $role = Role::query()->firstOrCreate(['slug' => 'admin'], ['name' => 'مدیر']);
+    $admin->roles()->sync([$role->id]);
+    actingAs($admin);
+});
+
+it('opens the create user form without the unresolvable-closure error', function (): void {
+    Livewire\Livewire::test(CreateUser::class)
+        ->assertOk();
+});
+
+it('accepts a +98 mobile and normalizes it, rejects a malformed one', function (): void {
+    Livewire\Livewire::test(CreateUser::class)
+        ->fillForm([
+            'name' => 'کاربر تست',
+            'email' => 'ok@example.com',
+            'mobile' => '+98 912 345 6789',
+            'password' => 'password12',
+        ])
+        ->call('create')
+        ->assertHasNoFormErrors();
+
+    expect(User::query()->where('email', 'ok@example.com')->value('mobile'))->toBe('09123456789');
+
+    Livewire\Livewire::test(CreateUser::class)
+        ->fillForm([
+            'name' => 'کاربر بد',
+            'email' => 'bad@example.com',
+            'mobile' => '123',
+            'password' => 'password12',
+        ])
+        ->call('create')
+        ->assertHasFormErrors(['mobile']);
+});