Let menu entries appear as buttons with icon, colours and phone placement

The menu editor gets "Als Button darstellen" per entry: shape, appearance and
size from the button design, fill and ink with hover and palette, icon colour,
icon from the dialog, motion, icon-only and where the button sits on the phone
(in the opened menu, beside the burger, or there as an icon only). Colours go
into the page stylesheet under a stable per-button id because the CSP forbids
inline styles. ADR 110.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

templates/blocks/block.html.twig

@@ -114,6 +114,10 @@
     <nav id="{{ block.id }}" class="block-menu menu-{{ menuLayout }} menu-collapse-{{ collapse }}{{ designClasses }}"
          aria-label="{{ {header: 'Hauptnavigation', secondary: 'Zweite Navigation', footer: 'Fußzeile', legal: 'Rechtliches'}[props.slot]|default('Navigation') }}">
         {% if menuLayout == 'burger' or collapse != 'never' %}
+        {# Buttons, die auf dem Telefon neben dem Menü-Knopf stehen bleiben (ADR 110). Sichtbar nur,
+           solange das Menü zusammengeklappt ist; im aufgeklappten Menü fehlen sie dann. #}
+        {% set barLinks = links|filter(link => link.button is defined and link.button.mobile|default('menu') in ['bar', 'bar-icon']) %}
+        {% if barLinks is not empty %}<ul class="menu-actions">{% for link in barLinks %}<li>{% include 'menu-button.html.twig' with {link: link, forceIconOnly: link.button.mobile == 'bar-icon'} only %}</li>{% endfor %}</ul>{% endif %}
         <details class="menu-burger">
             {# Nur Symbol behält den Namen für Vorlesesoftware; sichtbar ist dann nur der Strich. #}
             {% set burger = props.burgerLabel|default('both') %}