Add breadcrumbs and UI consistency updates across backoffice templates

templates/backoffice/base.html.twig

@@ -9,7 +9,9 @@
             {% block breadcrumbs %}{% endblock %}
         </div>
         {{ include('flashes.html.twig') }}
+        <div class="mb-5">
             {% block body %}
             {% endblock body %}
         </div>
+    </div>
 {% endblock %}