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>

public/assets/rich-text.js

@@ -9,6 +9,8 @@
  * the alternative would be a selection engine of our own. The formatting it produces is normalised
  * on the server anyway, so a browser quirk cannot store something unexpected.
  */
+import { openPageDialog } from './page-picker.js';
+import { openDocuments } from './media.js';
 
 /** Mirrors RichText::ALLOWED. Only used for the hint text and for cleaning up on paste. */
 export const ALLOWED_TAGS = ['p', 'br', 'strong', 'b', 'em', 'i', 'u', 's', 'code', 'mark', 'sup', 'sub', 'ul', 'ol', 'li', 'a'];
@@ -116,7 +118,12 @@ export function createRichText(value, apply, { label = 'Text', plain = false } =
     if ('Enter' === event.key) { event.preventDefault(); confirmLink(); }
     if ('Escape' === event.key) { event.preventDefault(); linkRow.hidden = true; surface.focus(); }
   });
-  linkRow.append(linkInput, newTabLabel, button('Übernehmen', 'Linkziel übernehmen', confirmLink, 'text-button'));
+  // Eine eigene Seite oder ein PDF wählt man, statt die Adresse zu kennen.
+  const fill = value => { linkInput.value = value; linkInput.focus(); };
+  linkRow.append(linkInput,
+    button('Seite …', 'Seite oder Beitrag als Linkziel wählen', () => openPageDialog({ onChoose: item => fill(item.path === 'home' ? '/' : `/${item.path}`) }), 'text-button'),
+    button('PDF …', 'PDF aus der Mediathek als Linkziel wählen', () => openDocuments({ onChoose: item => fill(item.src) }), 'text-button'),
+    newTabLabel, button('Übernehmen', 'Linkziel übernehmen', confirmLink, 'text-button'));
 
   bar.append(button('🔗', 'Link setzen oder entfernen', () => {
     const selection = window.getSelection();