Pick images, pages, forms, sections and terms instead of typing ids and addresses

The share image and featured image of a page become image fields with the library dialog,
as do image settings of plugins. The editor offers forms, sections, categories and tags as
lists, a page search next to every link target and in text links, the redirect target has a
page search, and the form editor picks the reply field, the condition and the option images.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/Twig/PluginExtension.php

@@ -33,9 +33,19 @@ final class PluginExtension extends AbstractExtension
             new TwigFunction('kant_plugin_props', $this->props(...)),
             new TwigFunction('kant_plugin_media', $this->mediaItem(...)),
             new TwigFunction('kant_plugin_settings', $this->plugins->settingsOf(...)),
+            new TwigFunction('kant_media', $this->adminMedia(...)),
         ];
     }
 
+    /**
+     * Ein Bild fuer ein Bildfeld der Verwaltung - auch ein archiviertes: es ist noch gewaehlt und
+     * wird noch ausgeliefert, also soll es auch zu sehen sein.
+     */
+    public function adminMedia(string $id): ?array
+    {
+        return 1 === preg_match('/^[a-f0-9]{32}$/D', $id) ? $this->media->find($id) : null;
+    }
+
     /** Die geprüften Eigenschaften eines Bausteins - oder null, wenn sie nicht ins Schema passen. */
     public function props(array $block): ?array
     {