feat: groups price calculator admin crud, booking/offer flow and api

templates/admin/booking_edit_draft/show.html.twig

@@ -1,9 +1,7 @@
 {% extends 'layout_admin.html.twig' %}
 
 {% block content %}
-    <h1 class="text-2xl font-bold pb-8">
-        Buchungsentwurf
-    </h1>
+    <twig:page:heading>Buchungsentwurf</twig:page:heading>
     <h2 class="text-xl font-bold pb-4">
         Vorgang {{ draft.bookingNumber }}
     </h2>