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/Controller/EditorController.php

@@ -139,9 +139,26 @@ final class EditorController extends AbstractController
             'buttonOptions' => \App\Content\ButtonDesign::OPTIONS,
             'buttonPresets' => \App\Content\ButtonDesign::PRESETS,
             'csrfToken' => $this->csrf->getToken('editor')->getValue(),
+            // Was ein Baustein per Adresse verknuepft, waehlt man aus einer Liste - niemand soll
+            // die Adresse eines Formulars oder einer Kategorie auswendig wissen muessen.
+            'choices' => $this->choices(),
         ]);
     }
 
+    /** @return array<string, array<string, string>> Adresse => Name, je Art */
+    private function choices(): array
+    {
+        $choices = ['forms' => [], 'sections' => $this->partials->choices('section'), 'categories' => [], 'tags' => []];
+        foreach ($this->forms->all() as $form) {
+            $choices['forms'][$form['slug']] = $form['name'];
+        }
+        foreach ($this->posts->allTerms() as $term) {
+            $choices['category' === $term['kind'] ? 'categories' : 'tags'][$term['slug']] = $term['name'];
+        }
+
+        return $choices;
+    }
+
     /** Saves or removes a reusable style, so a look can be applied to other blocks and pages. */
     #[Route('/api/style-presets', name: 'admin_style_preset', methods: ['POST'])]
     public function stylePreset(Request $request): JsonResponse