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>

templates/admin/content-picker.html.twig

@@ -1,5 +1,5 @@
 {% set selected = selected|default(null) %}
-<div class="content-picker" data-source="{{ path('admin_content_choices') }}" data-type="{{ type|default('') }}" data-parents="{{ parents|default(false) ? '1' : '0' }}"{% if valueKey|default('id') != 'id' %} data-value="{{ valueKey }}"{% endif %}>
+<div class="content-picker" data-source="{{ path('admin_content_choices') }}" data-type="{{ type|default('') }}" data-parents="{{ parents|default(false) ? '1' : '0' }}"{% if valueKey|default('id') != 'id' %} data-value="{{ valueKey }}"{% endif %}{% if free|default(false) %} data-free="1"{% endif %}>
     <label for="{{ id }}">{{ label|default('Seite suchen') }}</label>
     <div class="picker-input">
         <input id="{{ id }}" type="search" autocomplete="off" role="combobox" aria-autocomplete="list" aria-expanded="false" aria-controls="{{ id }}-results" placeholder="Titel oder Adresse suchen …" value="{{ selected ? selected.title ~ ' (/' ~ selected.path ~ ')' : '' }}">