Add TimestampToggle control

Add a control to allow users to switch between absolute and relatvie timestamps.

library/Icingadb/Web/Control/TimestampToggle.php

@@ -0,0 +1,93 @@
+<?php
+
+// SPDX-FileCopyrightText: 2026 Icinga GmbH <https://icinga.com>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+namespace Icinga\Module\Icingadb\Web\Control;
+
+use ipl\Html\Form;
+use ipl\I18n\Translation;
+use ipl\Web\Common\FormUid;
+
+class TimestampToggle extends Form
+{
+    use FormUid;
+    use Translation;
+
+    /** @var string Default timestamp mode param */
+    public const DEFAULT_TIMESTAMP_MODE_PARAM = 'timestamps';
+
+    /** @var bool Whether relative or absolute timestamps are to be used */
+    protected bool $enabled;
+
+    protected $defaultAttributes = [
+        'name'    => 'timestamp-toggle',
+        'class'   => ['icinga-form', 'icinga-controls', 'inline']
+    ];
+
+    /**
+     * Create a toggle to switch between absolute and relative timestamps
+     *
+     * When enabled, timestamps are displayed as relative, absolute otherwise
+     *
+     * @param bool $enabled True to use relative timestamps, false for absolute
+     */
+    public function __construct(bool $enabled = false)
+    {
+        $this->enabled = $enabled;
+        $this->addElementDecoratorLoaderPaths([['ipl\\Web\\Compat\\FormDecorator', 'Decorator']]);
+    }
+
+    /**
+     * Get the current value of the timestamp-toggle element
+     *
+     * @return string `absolute` or `relative`
+     */
+    public function getToggleValue(): string
+    {
+        return $this->getValue('timestamp-toggle');
+    }
+
+    /**
+     * Get whether the toggle is enabled
+     *
+     * When enabled, timestamps are displayed as relative, absolute otherwise
+     *
+     * @return bool
+     */
+    public function isEnabled(): bool
+    {
+        return $this->getElement('timestamp-toggle')->isChecked();
+    }
+
+    protected function assemble(): void
+    {
+        $this->addElement('checkbox', 'timestamp-toggle', [
+            'class'             => ['icingadb-timestamp-toggle', 'autosubmit'],
+            'label'             => $this->translate('Use relative timestamps'),
+            'value'             => $this->enabled,
+            'checkedValue'      => 'relative',
+            'uncheckedValue'    => 'absolute',
+            'decorators'        => [
+                'Label',
+                'LabelGroup' => [
+                    'name' => 'HtmlTag',
+                    'options' => [
+                        'tag' => 'div',
+                        'class' => 'control-label-group',
+                    ]
+                ],
+                'Checkbox',
+                'RenderElement',
+                'ControlGroup' => [
+                    'name' => 'HtmlTag',
+                    'options' => [
+                        'tag' => 'div',
+                        'class' => 'control-group'
+                    ]
+                ]
+            ]
+        ]);
+        $this->addElement($this->createUidElement());
+    }
+}