Replace hand-rolled auth with Laravel Breeze (Livewire stack)

Adds the auth Breeze scaffolds that were missing before: password
reset and email verification, plus a profile page (update name/email,
change password, delete account). User now implements MustVerifyEmail
so verification is actually enforced, not just scaffolded.

This does mean accepting Tailwind v3 (postcss/tailwind.config.js)
over the v4 CSS-first setup the app started with, and Livewire drops
from ^4.3 to ^3.6.4 — both forced by Breeze/Volt's current
compatibility requirements. Restored the Instrument Sans font Breeze's
installer dropped so styling stays close to what we had.

Reconciliation, since Breeze's installer assumes a blank-slate app:
- Deleted the hand-rolled Login/Register Livewire components/views/
  test — superseded by Breeze's Volt-based auth pages
  (resources/views/livewire/pages/auth/*), which also cover
  forgot-password, reset-password, verify-email, and confirm-password.
- Deleted Breeze's own default welcome/dashboard views and its
  separate app layout + nav component — kept our existing
  components/layouts/app.blade.php as the one real app layout, used
  Breeze's minimal layouts/guest.blade.php only for the auth pages.
- Rewrote routes/web.php merging our routes (home, sites, discover)
  with routes/auth.php; replaced every hardcoded route('dashboard')
  reference (5 Blade files plus, easy to miss, a plain PHP controller
  VerifyEmailController) with sites.index.
- Logout: Breeze's Actions\Logout::__invoke() returns void, so wired
  directly as a route it silently no-ops instead of redirecting;
  fixed with a thin closure that calls it then redirects.
- Fixed Breeze's own generated tests (Auth/AuthenticationTest,
  RegistrationTest, EmailVerificationTest, PasswordConfirmationTest)
  where they assumed the deleted dashboard route/nav component.

Verified: full suite (28 tests, including Breeze's Registration/
Authentication/PasswordReset/PasswordConfirmation/PasswordUpdate/
EmailVerification/Profile tests plus our own GuestPreviewTest) passes
against the huginn_testing MySQL database. Also smoke-tested for real:
all key pages return 200, /profile redirects guests to /login, guest
preview capping still works, and a real password-reset email was
generated and logged with correct branding and a working link.

resources/views/livewire/profile/update-profile-information-form.blade.php

@@ -0,0 +1,115 @@
+<?php
+
+use App\Models\User;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\Session;
+use Illuminate\Validation\Rule;
+use Livewire\Volt\Component;
+
+new class extends Component
+{
+    public string $name = '';
+    public string $email = '';
+
+    /**
+     * Mount the component.
+     */
+    public function mount(): void
+    {
+        $this->name = Auth::user()->name;
+        $this->email = Auth::user()->email;
+    }
+
+    /**
+     * Update the profile information for the currently authenticated user.
+     */
+    public function updateProfileInformation(): void
+    {
+        $user = Auth::user();
+
+        $validated = $this->validate([
+            'name' => ['required', 'string', 'max:255'],
+            'email' => ['required', 'string', 'lowercase', 'email', 'max:255', Rule::unique(User::class)->ignore($user->id)],
+        ]);
+
+        $user->fill($validated);
+
+        if ($user->isDirty('email')) {
+            $user->email_verified_at = null;
+        }
+
+        $user->save();
+
+        $this->dispatch('profile-updated', name: $user->name);
+    }
+
+    /**
+     * Send an email verification notification to the current user.
+     */
+    public function sendVerification(): void
+    {
+        $user = Auth::user();
+
+        if ($user->hasVerifiedEmail()) {
+            $this->redirectIntended(default: route('sites.index', absolute: false));
+
+            return;
+        }
+
+        $user->sendEmailVerificationNotification();
+
+        Session::flash('status', 'verification-link-sent');
+    }
+}; ?>
+
+<section>
+    <header>
+        <h2 class="text-lg font-medium text-gray-900 dark:text-gray-100">
+            {{ __('Profile Information') }}
+        </h2>
+
+        <p class="mt-1 text-sm text-gray-600 dark:text-gray-400">
+            {{ __("Update your account's profile information and email address.") }}
+        </p>
+    </header>
+
+    <form wire:submit="updateProfileInformation" class="mt-6 space-y-6">
+        <div>
+            <x-input-label for="name" :value="__('Name')" />
+            <x-text-input wire:model="name" id="name" name="name" type="text" class="mt-1 block w-full" required autofocus autocomplete="name" />
+            <x-input-error class="mt-2" :messages="$errors->get('name')" />
+        </div>
+
+        <div>
+            <x-input-label for="email" :value="__('Email')" />
+            <x-text-input wire:model="email" id="email" name="email" type="email" class="mt-1 block w-full" required autocomplete="username" />
+            <x-input-error class="mt-2" :messages="$errors->get('email')" />
+
+            @if (auth()->user() instanceof \Illuminate\Contracts\Auth\MustVerifyEmail && ! auth()->user()->hasVerifiedEmail())
+                <div>
+                    <p class="text-sm mt-2 text-gray-800 dark:text-gray-200">
+                        {{ __('Your email address is unverified.') }}
+
+                        <button wire:click.prevent="sendVerification" class="underline text-sm text-gray-600 dark:text-gray-400 hover:text-gray-900 dark:hover:text-gray-100 rounded-md focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 dark:focus:ring-offset-gray-800">
+                            {{ __('Click here to re-send the verification email.') }}
+                        </button>
+                    </p>
+
+                    @if (session('status') === 'verification-link-sent')
+                        <p class="mt-2 font-medium text-sm text-green-600 dark:text-green-400">
+                            {{ __('A new verification link has been sent to your email address.') }}
+                        </p>
+                    @endif
+                </div>
+            @endif
+        </div>
+
+        <div class="flex items-center gap-4">
+            <x-primary-button>{{ __('Save') }}</x-primary-button>
+
+            <x-action-message class="me-3" on="profile-updated">
+                {{ __('Saved.') }}
+            </x-action-message>
+        </div>
+    </form>
+</section>