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>

templates/admin/editor.html.twig

@@ -4,7 +4,7 @@
 {% set listRoute = area ? 'admin_partials' : (page.type == 'post' ? 'admin_posts' : 'admin_pages') %}
 {% block title %}{{ subject.title }} bearbeiten{% endblock %}
 {% block body_class %}editor-body{% endblock %}
-{% block styles %}<link rel="stylesheet" href="/assets/editor.css?v={{ kant_version() }}"><link rel="stylesheet" href="/assets/buttons.css?v={{ kant_version() }}"><link rel="stylesheet" href="/assets/button-controls.css?v={{ kant_version() }}"><link rel="stylesheet" href="/assets/color-control.css?v={{ kant_version() }}">{% endblock %}
+{% block styles %}<link rel="stylesheet" href="/assets/editor.css?v={{ kant_version() }}"><link rel="stylesheet" href="/assets/media-dialog.css?v={{ kant_version() }}"><link rel="stylesheet" href="/assets/buttons.css?v={{ kant_version() }}"><link rel="stylesheet" href="/assets/button-controls.css?v={{ kant_version() }}"><link rel="stylesheet" href="/assets/color-control.css?v={{ kant_version() }}">{% endblock %}
 {% block scripts %}<script type="module" src="/assets/editor.js?v={{ kant_version() }}"></script>{% endblock %}
 {% block body %}
 {# The API base decides what is edited. An area is shared, so it has no draft and no