feat: paginate the staffing matrix preview

src/Controller/Admin/System/StaffingRule/PreviewController.php

@@ -4,20 +4,24 @@ namespace App\Controller\Admin\System\StaffingRule;
 
 use App\Service\Assignment\StaffingConfigurationException;
 use App\Service\Export\StaffingPreviewExporter;
+use Knp\Component\Pager\PaginatorInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Routing\Attribute\Route;
 use Symfony\Component\Security\Http\Attribute\IsGranted;
 
 class PreviewController extends AbstractController
 {
-    public function __construct(private readonly StaffingPreviewExporter $previewExporter)
-    {
+    public function __construct(
+        private readonly StaffingPreviewExporter $previewExporter,
+        private readonly PaginatorInterface $paginator,
+    ) {
     }
 
     #[Route('/admin/system/staffing-rule/preview', name: 'app_admin_system_staffing_rule_preview')]
     #[IsGranted('ROLE_TEAM_ADMIN')]
-    public function index(): Response
+    public function index(Request $request): Response
     {
         try {
             $rows = $this->previewExporter->rows();
@@ -27,8 +31,16 @@ class PreviewController extends AbstractController
             return $this->redirectToRoute('app_admin_system_staffing_rule_index');
         }
 
+        // The candidates are a computed list, not a query: page the finished rows. The Excel
+        // export stays the full list.
+        $pagination = $this->paginator->paginate(
+            $rows,
+            $request->query->getInt('page', 1),
+            $request->query->getInt('limit', 50),
+        );
+
         return $this->render('admin/system/staffing_rule/preview.html.twig', [
-            'rows' => $rows,
+            'pagination' => $pagination,
         ]);
     }
 }