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/favicon.html.twig

@@ -1,9 +1,11 @@
 {# Das Symbol der Website. Eigenes Bild aus den Einstellungen, sonst das mitgelieferte Zeichen.
    Die Kennung hängt als Version am Verweis, damit ein Wechsel im Browser auch ankommt. #}
-{% set favicon = siteSettings.load().faviconMediaId|default('') %}
+{% set site = siteSettings.load() %}
+{% set favicon = site.faviconMediaId|default('') %}
+{% set version = site.faviconVersion|default('') ?: favicon|slice(0, 8) %}
 {% if favicon %}
-    <link rel="icon" href="/favicon.png?v={{ favicon|slice(0, 8) }}" type="image/png" sizes="32x32">
-    <link rel="apple-touch-icon" href="/apple-touch-icon.png?v={{ favicon|slice(0, 8) }}">
+    <link rel="icon" href="/favicon.png?v={{ version }}" type="image/png" sizes="32x32">
+    <link rel="apple-touch-icon" href="/apple-touch-icon.png?v={{ version }}">
 {% else %}
     <link rel="icon" href="/favicon.svg" type="image/svg+xml">
 {% endif %}