Refatora CSS e templates do menu estrutural

Reescreve structural-pages-menu.css com layout horizontal como padrão
(análogo ao microsite-nav) e flyout lateral apenas em contexto sidebar.
Extrai renderização de itens para structural-pages-menu-item.html.twig
e adiciona link "Home" apontando para a URL do ancestral.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

templates/structural-pages-menu-item.html.twig

@@ -0,0 +1,39 @@
+{#
+/**
+ * @file
+ * Template for a single structural pages menu item (recursive).
+ *
+ * Available variables:
+ * - item: Menu item array with keys:
+ *   - id: Node ID.
+ *   - title: Node title.
+ *   - url: Node URL string.
+ *   - is_redirect: Whether the link is a redirect.
+ *   - children: Array of child items.
+ * - active_trail: Array of node IDs in the active trail.
+ * - depth: Current depth level (integer).
+ */
+#}
+{% set is_active = item.id in active_trail %}
+{% set has_children = item.children is not empty %}
+{% set classes = [
+  'menu-item',
+  'structural-pages-menu__item',
+  'structural-pages-menu__item--level-' ~ depth,
+  is_active ? 'menu-item--active-trail structural-pages-menu__item--active-trail' : '',
+  has_children ? 'menu-item--expanded structural-pages-menu__item--has-children' : '',
+]|filter(c => c is not empty)|join(' ') %}
+
+<li class="{{ classes }}">
+  <a href="{{ item.url }}"{% if item.is_redirect %} target="_blank"{% endif %} class="structural-pages-menu__link{% if is_active %} is-active structural-pages-menu__link--active-trail{% endif %}">
+    {{- item.title -}}
+  </a>
+
+  {% if has_children %}
+    <ul class="menu sub-menu structural-pages-menu__list structural-pages-menu__list--level-{{ depth + 1 }}">
+      {% for child in item.children %}
+        {% include '@structural_pages/structural-pages-menu-item.html.twig' with {'item': child, 'active_trail': active_trail, 'depth': depth + 1} only %}
+      {% endfor %}
+    </ul>
+  {% endif %}
+</li>