Add authentication, a public landing page, and guest data preview

Hand-rolled login/register/logout on Laravel's built-in Auth facade
rather than Breeze/Jetstream, which scaffold Tailwind v3 config and
would fight our existing Tailwind v4 CSS-first setup. Login/Register
are Livewire components; logout is a plain POST route (auth-gated,
CSRF-protected).

Routing: "/" is now a public landing page describing the project;
the sites list moved from "/" to "/sites" to make room for it.

Data gating: App\Support\GuestPreview::paginate() forces page 1 and a
5-row page size for unauthenticated visitors on Sites, Discover, and
a site's Pages/Backlinks tables, while total() still reflects the
real match count — authenticated users get the existing full
pagination unchanged. A shared guest-preview-notice component shows
"N of M results, sign in to see all" and only renders when something
is actually being hidden.

Testing: pointed the test suite at a dedicated MySQL database
(huginn_testing) instead of the default in-memory SQLite, since the
existing fulltext index migration isn't SQLite-compatible — this app
is MySQL-specific by now regardless. Added AuthFlowTest (register,
login, wrong-password rejection, logout) and GuestPreviewTest (guest
capped to a preview, authenticated sees everything), all passing.

Also fixed a real bug the tests caught: request()->session() isn't
reliably attached during Livewire's in-process test action calls;
switched Login/Register to the session() helper, which resolves the
session store directly and works in both contexts.

app/Livewire/Auth/Login.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Livewire\Auth;
+
+use Illuminate\Contracts\View\View;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Validation\ValidationException;
+use Livewire\Attributes\Layout;
+use Livewire\Component;
+
+#[Layout('components.layouts.app')]
+class Login extends Component
+{
+    public string $email = '';
+
+    public string $password = '';
+
+    public bool $remember = false;
+
+    public function login(): void
+    {
+        $this->validate([
+            'email' => ['required', 'email'],
+            'password' => ['required'],
+        ]);
+
+        if (! Auth::attempt(['email' => $this->email, 'password' => $this->password], $this->remember)) {
+            throw ValidationException::withMessages([
+                'email' => 'These credentials do not match our records.',
+            ]);
+        }
+
+        session()->regenerate();
+
+        $this->redirect(route('sites.index'), navigate: false);
+    }
+
+    public function render(): View
+    {
+        return view('livewire.auth.login');
+    }
+}

app/Livewire/Auth/Register.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace App\Livewire\Auth;
+
+use App\Models\User;
+use Illuminate\Contracts\View\View;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Validation\Rules\Password;
+use Livewire\Attributes\Layout;
+use Livewire\Component;
+
+#[Layout('components.layouts.app')]
+class Register extends Component
+{
+    public string $name = '';
+
+    public string $email = '';
+
+    public string $password = '';
+
+    public string $password_confirmation = '';
+
+    public function register(): void
+    {
+        $validated = $this->validate([
+            'name' => ['required', 'string', 'max:255'],
+            'email' => ['required', 'email', 'max:255', 'unique:users,email'],
+            'password' => ['required', 'confirmed', Password::defaults()],
+        ]);
+
+        $user = User::create([
+            'name' => $validated['name'],
+            'email' => $validated['email'],
+            'password' => $validated['password'],
+        ]);
+
+        Auth::login($user);
+
+        session()->regenerate();
+
+        $this->redirect(route('sites.index'), navigate: false);
+    }
+
+    public function render(): View
+    {
+        return view('livewire.auth.register');
+    }
+}

app/Livewire/Discover/Search.php

@@ -3,6 +3,7 @@
 namespace App\Livewire\Discover;
 
 use App\Models\Site;
+use App\Support\GuestPreview;
 use Illuminate\Contracts\View\View;
 use Illuminate\Pagination\LengthAwarePaginator;
 use Livewire\Attributes\Layout;
@@ -67,7 +68,7 @@ class Search extends Component
         if (! $hasQuery) {
             $sites = new LengthAwarePaginator([], 0, 25, 1, ['path' => request()->url()]);
         } else {
-            $sites = Site::query()
+            $sites = GuestPreview::paginate(Site::query()
                 ->when(
                     $keyword !== '',
                     fn ($query) => $query->whereHas(
@@ -98,8 +99,7 @@ class Search extends Component
                     }
                 }])
                 ->orderByDesc('matching_pages_count')
-                ->orderBy('domain')
-                ->paginate(25);
+                ->orderBy('domain'));
         }
 
         return view('livewire.discover.search', ['sites' => $sites, 'hasQuery' => $hasQuery]);

app/Livewire/Sites/Index.php

@@ -3,6 +3,7 @@
 namespace App\Livewire\Sites;
 
 use App\Models\Site;
+use App\Support\GuestPreview;
 use Illuminate\Contracts\View\View;
 use Livewire\Attributes\Layout;
 use Livewire\Attributes\Url;
@@ -24,14 +25,15 @@ class Index extends Component
 
     public function render(): View
     {
-        $sites = Site::query()
-            ->withCount('pages')
-            ->when(
-                $this->search !== '',
-                fn ($query) => $query->where('domain', 'like', '%'.$this->search.'%')
-            )
-            ->orderBy('domain')
-            ->paginate(25);
+        $sites = GuestPreview::paginate(
+            Site::query()
+                ->withCount('pages')
+                ->when(
+                    $this->search !== '',
+                    fn ($query) => $query->where('domain', 'like', '%'.$this->search.'%')
+                )
+                ->orderBy('domain')
+        );
 
         return view('livewire.sites.index', ['sites' => $sites]);
     }