performance improvements (#2329)

* remove work from constructor
* refactor twig extensions
* upgrade theme
* replace sub-request with direct template rendering

src/Twig/Runtime/TimesheetExtension.php

@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Twig\Runtime;
+
+use App\Entity\User;
+use App\Repository\TimesheetRepository;
+use Twig\Extension\RuntimeExtensionInterface;
+
+final class TimesheetExtension implements RuntimeExtensionInterface
+{
+    /**
+     * @var TimesheetRepository
+     */
+    private $repository;
+
+    public function __construct(TimesheetRepository $repository)
+    {
+        $this->repository = $repository;
+    }
+
+    public function activeEntries(User $user): array
+    {
+        return $this->repository->getActiveEntries($user);
+    }
+}