feat: additional receipts as attachments to teamer invoices

addresses #869dv97u9

templates/administrative/document/modal_check.html.twig

@@ -13,6 +13,26 @@
         </h2>
         {{ icon('eye') }}
     </a>
+    {# Belege backing this Honorarnote. Opened inline so the download route does not mark them
+       as downloaded - that marking is meant for the invoice itself. They are deleted as soon as
+       the invoice is accepted. #}
+    {% if receipts is not empty %}
+        <div class="pb-4">
+            <div class="font-bold pb-1">Belege</div>
+            <ul class="list-disc pl-4">
+                {% for receipt in receipts %}
+                    <li>
+                        <a href="{{ path('app_common_download', { 'uuid': receipt.uuid, 'inline': true }) }}"
+                           target="_blank"
+                           class="underline"
+                           title="Beleg öffnen">
+                            {{ receipt }}
+                        </a>
+                    </li>
+                {% endfor %}
+            </ul>
+        </div>
+    {% endif %}
     <div class="flex flex-col space-y-4 pb-4">
         {{ form_row(form.status) }}
         {% if form.specialAgreements is defined %}