feat: show group or contact name in the offer headline

templates/groups/offer/view.html.twig

@@ -49,8 +49,9 @@
             {% include '_partials/_flashes.html.twig' %}
 
             <hgroup>
+                {% set addressee = booking.groupName ?: [booking.firstName, booking.lastName] | filter(v => v) | join(' ') %}
                 <h1 class="text-2xl lg:text-4xl font-bold mb-2">
-                    {{ booking.acceptedAt is not null ? 'Deine Buchung' : 'Dein Angebot' }}
+                    {{ booking.acceptedAt is not null ? 'Deine Buchung' : 'Dein Angebot' }}{% if addressee %}, {{ addressee }}{% endif %}
                 </h1>
                 <p class="text-2xl">
                     {{ ctx.accommodation.name }}