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>

tests/Feature/Jobs/PublishPostJobTest.php

@@ -0,0 +1,82 @@
+<?php
+
+use App\Jobs\PublishPostJob;
+use App\Models\Post;
+use App\Models\Site;
+use App\Models\SocialAccount;
+use App\Support\Publishing\PublisherManager;
+use Illuminate\Support\Facades\Http;
+use Illuminate\Support\Facades\Process;
+
+test('it publishes and updates the post on success', function () {
+    Http::fake([
+        '*/wp-json/wp/v2/posts' => Http::response(['link' => 'https://wp.example.com/post'], 201),
+    ]);
+
+    $site = Site::factory()->wordpress()->create();
+    $post = Post::factory()->create(['site_id' => $site->id, 'type' => 'blog', 'title' => 'Hi', 'status' => 'publishing']);
+
+    (new PublishPostJob($post->id))->handle(app(PublisherManager::class));
+
+    expect($post->fresh())
+        ->status->toBe('published')
+        ->published_url->toBe('https://wp.example.com/post')
+        ->publish_error->toBeNull();
+});
+
+test('it marks the post failed when the publish attempt fails', function () {
+    Http::fake([
+        '*/wp-json/wp/v2/posts' => Http::response(['message' => 'nope'], 401),
+    ]);
+
+    $site = Site::factory()->wordpress()->create();
+    $post = Post::factory()->create(['site_id' => $site->id, 'type' => 'blog', 'title' => 'Hi', 'status' => 'publishing']);
+
+    (new PublishPostJob($post->id))->handle(app(PublisherManager::class));
+
+    expect($post->fresh())
+        ->status->toBe('failed')
+        ->publish_error->toBe('nope');
+});
+
+test('it reverts a rejected post to draft instead of failed', function () {
+    $site = Site::factory()->wordpress()->create();
+    $post = Post::factory()->create(['site_id' => $site->id, 'type' => 'blog', 'title' => null, 'status' => 'publishing']);
+
+    (new PublishPostJob($post->id))->handle(app(PublisherManager::class));
+
+    expect($post->fresh())
+        ->status->toBe('draft')
+        ->publish_error->toContain('no title');
+});
+
+test('it reverts to draft when no publisher supports the post type', function () {
+    $post = Post::factory()->create(['type' => 'twitter', 'status' => 'publishing']);
+
+    (new PublishPostJob($post->id))->handle(app(PublisherManager::class));
+
+    expect($post->fresh())
+        ->status->toBe('draft')
+        ->publish_error->toContain('No publisher available');
+});
+
+test('it publishes a reddit post via the sidecar', function () {
+    Process::fake([
+        '*' => Process::result(output: json_encode(['success' => true, 'url' => 'https://reddit.com/r/test/comments/abc'])),
+    ]);
+
+    $account = SocialAccount::factory()->create(['network' => 'reddit']);
+    $post = Post::factory()->create([
+        'type' => 'reddit',
+        'title' => 'Hi',
+        'target' => 'test',
+        'social_account_id' => $account->id,
+        'status' => 'publishing',
+    ]);
+
+    (new PublishPostJob($post->id))->handle(app(PublisherManager::class));
+
+    expect($post->fresh())
+        ->status->toBe('published')
+        ->published_url->toBe('https://reddit.com/r/test/comments/abc');
+});