Auth: convert auth views and verification email to Nova layout

tests/Feature/Auth/UsernamePolicyTest.php

@@ -0,0 +1,83 @@
+<?php
+
+use App\Models\User;
+
+test('registration normalizes username to lowercase', function () {
+    $user = User::factory()->create([
+        'onboarding_step' => 'password',
+        'username' => null,
+    ]);
+
+    $response = $this->actingAs($user)->post('/setup/username', [
+        'username' => '  GregOr_One  ',
+    ]);
+
+    $response->assertRedirect('/@gregor_one');
+
+    $this->assertDatabaseHas('users', [
+        'id' => $user->id,
+        'username' => 'gregor_one',
+    ]);
+});
+
+test('registration rejects reserved usernames', function () {
+    $user = User::factory()->create([
+        'onboarding_step' => 'password',
+    ]);
+
+    $response = $this->actingAs($user)->from('/setup/username')->post('/setup/username', [
+        'username' => 'admin',
+    ]);
+
+    $response->assertSessionHasErrors('username');
+    $this->assertAuthenticatedAs($user);
+});
+
+test('legacy profile username route redirects to canonical at-username route', function () {
+    $user = User::factory()->create(['username' => 'author_two']);
+
+    $response = $this->get('/profile/Author_Two');
+
+    $response->assertRedirect('/@author_two');
+});
+
+test('non-canonical at-username route redirects to lowercase canonical route', function () {
+    $user = User::factory()->create(['username' => 'author_two']);
+
+    $response = $this->get('/@Author_Two');
+
+    $response->assertRedirect('/@author_two');
+});
+
+test('profile username update writes history and redirect map', function () {
+    $user = User::factory()->create([
+        'username' => 'oldname',
+        'username_changed_at' => now()->subDays(120),
+    ]);
+
+    $response = $this
+        ->actingAs($user)
+        ->patch('/profile', [
+            'username' => 'New_Name',
+            'name' => $user->name,
+            'email' => $user->email,
+        ]);
+
+    $response->assertRedirect('/user');
+
+    $this->assertDatabaseHas('users', [
+        'id' => $user->id,
+        'username' => 'new_name',
+    ]);
+
+    $this->assertDatabaseHas('username_history', [
+        'user_id' => $user->id,
+        'old_username' => 'oldname',
+    ]);
+
+    $this->assertDatabaseHas('username_redirects', [
+        'old_username' => 'oldname',
+        'new_username' => 'new_name',
+        'user_id' => $user->id,
+    ]);
+});