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/forms.html.twig

@@ -2,7 +2,7 @@
 {% set nav = 'forms' %}
 {# Die Vorschau zeichnet den Absendeknopf mit dem Standardbutton der Website - dafuer braucht die
    Seite dessen Stylesheet, genau wie die Designseite. #}
-{% block styles %}<link rel="stylesheet" href="/assets/buttons.css?v={{ kant_version() }}"><link rel="stylesheet" href="/assets/color-control.css?v={{ kant_version() }}">{% endblock %}
+{% block styles %}<link rel="stylesheet" href="/assets/buttons.css?v={{ kant_version() }}"><link rel="stylesheet" href="/assets/color-control.css?v={{ kant_version() }}"><link rel="stylesheet" href="/assets/media-dialog.css?v={{ kant_version() }}">{% endblock %}
 {% block scripts %}<script type="module" src="/assets/form-editor.js?v={{ kant_version() }}"></script>{% endblock %}
 {% block title %}Formulare{% endblock %}
 {% block heading %}Formulare{% endblock %}
@@ -105,7 +105,7 @@
         {% else %}
         <div class="card-head">
             <h2>{{ form.name }} <span class="count">{{ form.fields|length }} {{ form.fields|length == 1 ? 'Feld' : 'Felder' }}</span></h2>
-            <span class="muted">Im Editor als Formularblock mit der Adresse <code>{{ form.slug }}</code></span>
+            <span class="muted">Im Editor über den Formularblock wählbar · Adresse <code>{{ form.slug }}</code></span>
         </div>
         {% endif %}
         <div class="card-body form-editor">
@@ -120,7 +120,7 @@
                     <div>
                         <label for="slug-new">Adresse</label>
                         <input id="slug-new" name="slug" maxlength="80" pattern="[a-z0-9]+(-[a-z0-9]+)*" required placeholder="kontakt">
-                        <p class="field-help">Wird im Formularblock eingetragen. Kleinbuchstaben, Ziffern, Bindestrich.</p>
+                        <p class="field-help">Kurzname des Formulars, etwa kontakt. Kleinbuchstaben, Ziffern, Bindestrich. Im Editor wird das Formular dann aus einer Liste gewählt.</p>
                     </div>
                     {% endif %}
                     <div>