Pick the site icon from the library and crop it, find legal pages by search, list newest first

- The site icon is no longer a select at the end of the company data. It has
  its own section: a button opens the media library (upload included), then
  a square is dragged, resized by its corner, a slider or +/-, and previewed
  at 180 and 32 px. The crop is stored as fractions (faviconCrop) and the
  PNGs are cut from it; faviconVersion changes the link so browsers pick up
  a new cut. Icons without a crop keep their old link.
- openMedia() takes needsAlt: false, since the icon never appears as
  content. The dialog styles moved from editor.css to media-dialog.css so
  the dialog works outside the editor.
- Privacy page and imprint are chosen with the content search, like the 404
  page. The picker can store the path instead of the id (valueKey/data-value).
- The page and post lists in the administration sort newest first; the
  subpage indentation is gone there, as it would point at the wrong parent.

Tests: 581 PHPUnit, 35 node, test:editor green (the consent step now picks
the privacy page by search). test:admin --admin-only fails only at the known
nested-interactive menu summaries.

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

public/assets/media.js

@@ -40,7 +40,8 @@ export function createMediaPreview(initial = {}) {
   return { element: wrap, update };
 }
 
-export function openMedia({ multiple = false, onChoose } = {}) {
+/** needsAlt: false for images that never appear as content, such as the site icon. */
+export function openMedia({ multiple = false, onChoose, needsAlt = true } = {}) {
   const opener = document.activeElement;
   const dialog = element('dialog', '', 'media-dialog'); dialog.id = 'media-dialog';
   dialog.setAttribute('aria-labelledby', 'media-title');
@@ -128,11 +129,11 @@ export function openMedia({ multiple = false, onChoose } = {}) {
     }
     $('#media-upload').value = ''; lock(false); render(); details(); error(failures.join(' · '));
   });
-  $('#media-insert').hidden = !onChoose; $('#decorative-choice').hidden = !onChoose;
+  $('#media-insert').hidden = !onChoose; $('#decorative-choice').hidden = !onChoose || !needsAlt;
   $('#media-insert').addEventListener('click', () => {
     const chosen = [...selected].map(id => items.find(item => item.id === id)).filter(item => item && !item.archived);
     const decorative = $('#media-decorative').checked;
-    if (!decorative && chosen.some(item => !item.alt.trim())) { error('Bitte für die gewählten Bilder einen Alternativtext speichern oder die dekorative Verwendung wählen.'); return; }
+    if (needsAlt && !decorative && chosen.some(item => !item.alt.trim())) { error('Bitte für die gewählten Bilder einen Alternativtext speichern oder die dekorative Verwendung wählen.'); return; }
     onChoose(chosen.map(item => ({ ...item, decorative }))); dialog.close();
   });
   dialog.showModal(); lock(true);