Auth: convert auth views and verification email to Nova layout

tests/Feature/Auth/SetupUsernameTest.php

@@ -0,0 +1,77 @@
+<?php
+
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+
+uses(RefreshDatabase::class);
+
+it('requires authentication to open setup username screen', function () {
+    $this->get('/setup/username')
+        ->assertRedirect('/login');
+});
+
+it('renders setup username screen for authenticated user', function () {
+    $user = User::factory()->create([
+        'onboarding_step' => 'password',
+    ]);
+
+    $this->actingAs($user)
+        ->get('/setup/username')
+        ->assertOk();
+});
+
+it('accepts unique username and completes onboarding', function () {
+    $user = User::factory()->create([
+        'username' => 'initial_user',
+        'onboarding_step' => 'password',
+    ]);
+
+    $response = $this->actingAs($user)
+        ->post('/setup/username', [
+            'username' => 'Final_User_7',
+        ]);
+
+    $response->assertRedirect('/@final_user_7');
+
+    $user->refresh();
+    expect($user->username)->toBe('final_user_7');
+    expect($user->onboarding_step)->toBe('complete');
+    expect($user->username_changed_at)->not->toBeNull();
+});
+
+it('rejects reserved username in setup flow', function () {
+    $user = User::factory()->create([
+        'onboarding_step' => 'password',
+    ]);
+
+    $this->actingAs($user)
+        ->from('/setup/username')
+        ->post('/setup/username', [
+            'username' => 'admin',
+        ])
+        ->assertRedirect('/setup/username')
+        ->assertSessionHasErrors('username');
+
+    expect($user->fresh()->onboarding_step)->toBe('password');
+});
+
+it('queues similarity-flagged username for manual approval in setup flow', function () {
+    $user = User::factory()->create([
+        'onboarding_step' => 'password',
+    ]);
+
+    $this->actingAs($user)
+        ->from('/setup/username')
+        ->post('/setup/username', [
+            'username' => 'support1',
+        ])
+        ->assertRedirect('/setup/username')
+        ->assertSessionHasErrors('username');
+
+    $this->assertDatabaseHas('username_approval_requests', [
+        'user_id' => $user->id,
+        'requested_username' => 'support1',
+        'context' => 'onboarding_username',
+        'status' => 'pending',
+    ]);
+});