update kirby to v5 and add refresh cache panel view button

public/kirby/src/Content/ImmutableMemoryStorage.php

@@ -0,0 +1,90 @@
+<?php
+
+namespace Kirby\Content;
+
+use Kirby\Cms\Language;
+use Kirby\Cms\ModelWithContent;
+use Kirby\Exception\LogicException;
+
+/**
+ * @package   Kirby Content
+ * @author    Nico Hoffmann <nico@getkirby.com>
+ * @link      https://getkirby.com
+ * @copyright Bastian Allgeier
+ * @license   https://getkirby.com/license
+ */
+class ImmutableMemoryStorage extends MemoryStorage
+{
+	public function __construct(
+		protected ModelWithContent $model,
+		protected ModelWithContent|null $nextModel = null
+	) {
+		parent::__construct($model);
+	}
+
+	/**
+	 * Immutable storage entries cannot be deleted
+	 *
+	 * @throws \Kirby\Exception\LogicException
+	 */
+	public function delete(VersionId $versionId, Language $language): void
+	{
+		$this->preventMutation('deleted');
+	}
+
+	/**
+	 * Immutable storage entries cannot be moved
+	 *
+	 * @throws \Kirby\Exception\LogicException
+	 */
+	public function move(
+		VersionId $fromVersionId,
+		Language $fromLanguage,
+		VersionId|null $toVersionId = null,
+		Language|null $toLanguage = null,
+		Storage|null $toStorage = null
+	): void {
+		$this->preventMutation('moved');
+	}
+
+	/**
+	 * Returns the next state of the model if the
+	 * reference is given
+	 */
+	public function nextModel(): ModelWithContent|null
+	{
+		return $this->nextModel;
+	}
+
+	/**
+	 * Throws an exception to avoid the mutation of storage data
+	 *
+	 * @throws \Kirby\Exception\LogicException
+	 */
+	protected function preventMutation(string $mutation): void
+	{
+		throw new LogicException(
+			message: 'Storage for the ' . $this->model::CLASS_ALIAS . ' is immutable and cannot be ' . $mutation . '. Make sure to use the last alteration of the object.'
+		);
+	}
+
+	/**
+	 * Immutable storage entries cannot be touched
+	 *
+	 * @throws \Kirby\Exception\LogicException
+	 */
+	public function touch(VersionId $versionId, Language $language): void
+	{
+		$this->preventMutation('touched');
+	}
+
+	/**
+	 * Immutable storage entries cannot be updated
+	 *
+	 * @throws \Kirby\Exception\LogicException
+	 */
+	public function update(VersionId $versionId, Language $language, array $fields): void
+	{
+		$this->preventMutation('updated');
+	}
+}