Add a Publisher abstraction and queued job to publish from the UI

Introduce Publisher/PublisherManager (WordPress + Reddit implementations)
so publishing logic is shared between the CLI, the queue, and future
network integrations. Add a "Publish" button on the Posts page that
dispatches PublishPostJob instead of blocking the request — Reddit's
publisher shells out to the existing Playwright sidecar and can take
tens of seconds, so it can't run synchronously in a web request.

Adds a `target` field (e.g. subreddit) and `publishing` status to Post,
plus a `publish_error` field so failures surface in the UI. Refactors
posts:publish to delegate to WordPressPublisher without changing its
CLI output contract (existing tests pass unchanged).

Also fixes two bugs found along the way: UpdatePostRequest was silently
dropping `published_url` from PATCH requests (never in its validation
rules, despite AI_API.md documenting it), and three Livewire index-page
tests were broken by the earlier auth change (never re-run after adding
the `auth` middleware) since they hit routes via HTTP without a logged-in
user.

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

app/Livewire/Auth/Login.php

@@ -28,7 +28,7 @@ class Login extends Component
             return;
         }
 
-        request()->session()->regenerate();
+        session()->regenerate();
 
         $this->redirect(route('sites.index'), navigate: true);
     }

app/Livewire/Posts/Index.php

@@ -2,9 +2,11 @@
 
 namespace App\Livewire\Posts;
 
+use App\Jobs\PublishPostJob;
 use App\Models\Post;
 use App\Models\Site;
 use App\Models\SocialAccount;
+use App\Support\Publishing\PublisherManager;
 use Livewire\Attributes\Layout;
 use Livewire\Component;
 
@@ -25,21 +27,45 @@ class Index extends Component
 
     public string $body = '';
 
+    public string $target = '';
+
     public string $status = 'draft';
 
     public string $scheduledAt = '';
 
+    public ?string $publishNotice = null;
+
     public function render()
     {
+        $posts = Post::with(['site', 'socialAccount'])->orderByDesc('created_at')->get();
+
         return view('livewire.posts.index', [
-            'posts' => Post::with(['site', 'socialAccount'])->orderByDesc('created_at')->get(),
+            'posts' => $posts,
             'sites' => Site::orderBy('name')->get(),
             'accounts' => SocialAccount::orderBy('username')->get(),
             'types' => Post::TYPES,
             'statuses' => Post::STATUSES,
+            'hasPublishing' => $posts->contains('status', 'publishing'),
         ]);
     }
 
+    public function publish(int $id): void
+    {
+        $this->publishNotice = null;
+
+        $post = Post::with('site')->findOrFail($id);
+
+        if (! app(PublisherManager::class)->resolve($post)) {
+            $this->publishNotice = "No publisher available yet for post type '{$post->type}'.";
+
+            return;
+        }
+
+        $post->update(['status' => 'publishing', 'publish_error' => null]);
+
+        PublishPostJob::dispatch($post->id);
+    }
+
     public function create(): void
     {
         $this->resetForm();
@@ -55,6 +81,7 @@ class Index extends Component
         $this->type = $post->type;
         $this->title = (string) $post->title;
         $this->body = $post->body;
+        $this->target = (string) $post->target;
         $this->status = $post->status;
         $this->scheduledAt = $post->scheduled_at?->format('Y-m-d\TH:i') ?? '';
         $this->showForm = true;
@@ -68,6 +95,7 @@ class Index extends Component
             'type' => ['required', 'string', 'in:' . implode(',', Post::TYPES)],
             'title' => ['nullable', 'string', 'max:255'],
             'body' => ['required', 'string'],
+            'target' => ['nullable', 'string', 'max:255'],
             'status' => ['required', 'string', 'in:' . implode(',', Post::STATUSES)],
             'scheduledAt' => ['nullable', 'date'],
         ]);
@@ -78,6 +106,7 @@ class Index extends Component
             'type' => $validated['type'],
             'title' => $validated['title'] ?: null,
             'body' => $validated['body'],
+            'target' => $validated['target'] ?: null,
             'status' => $validated['status'],
             'scheduled_at' => $validated['scheduledAt'] ?: null,
         ]);
@@ -99,6 +128,7 @@ class Index extends Component
         $this->type = '';
         $this->title = '';
         $this->body = '';
+        $this->target = '';
         $this->status = 'draft';
         $this->scheduledAt = '';
         $this->resetValidation();