feat: per-subscriber Mailwizz sync button on admin list

Add POST route and form request to queue SyncSubscriberToMailwizz for one
subscriber when the page has Mailwizz configured. Include Dutch strings
and feature tests for auth and edge cases.

Made-with: Cursor

app/Http/Controllers/Admin/SubscriberController.php

@@ -8,6 +8,8 @@ use App\Http\Controllers\Controller;
 use App\Http\Requests\Admin\DestroySubscriberRequest;
 use App\Http\Requests\Admin\IndexSubscriberRequest;
 use App\Http\Requests\Admin\QueueMailwizzSyncRequest;
+use App\Http\Requests\Admin\SyncSubscriberMailwizzRequest;
+use App\Jobs\SyncSubscriberToMailwizz;
 use App\Models\PreregistrationPage;
 use App\Models\Subscriber;
 use App\Services\CleanupSubscriberIntegrationsService;
@@ -79,6 +81,26 @@ class SubscriberController extends Controller
             ));
     }
 
+    public function syncSubscriberMailwizz(
+        SyncSubscriberMailwizzRequest $request,
+        PreregistrationPage $page,
+        Subscriber $subscriber
+    ): RedirectResponse {
+        $page->loadMissing('mailwizzConfig');
+
+        if ($page->mailwizzConfig === null) {
+            return redirect()
+                ->route('admin.pages.subscribers.index', $page)
+                ->with('error', __('This page has no Mailwizz integration.'));
+        }
+
+        SyncSubscriberToMailwizz::dispatch($subscriber->fresh());
+
+        return redirect()
+            ->route('admin.pages.subscribers.index', $page)
+            ->with('status', __('Mailwizz sync has been queued for this subscriber.'));
+    }
+
     public function export(IndexSubscriberRequest $request, PreregistrationPage $page): StreamedResponse
     {
         $search = $request->validated('search');