[TASK] refactor list in sidebar (cox, rower)

templates/includes/macros.html.tera

@@ -41,3 +41,15 @@
 </div>
 {% endmacro alert %}
 
+{% macro box(participants, empty_seats, header='Ruderer können noch teilnehmen', text='Keine Ruderer angemeldet', bg='primary-600', color='white') %}
+<div class="text-{{ color }} bg-{{ bg }} text-center p-1 mt-1 rounded-t-md">{{ empty_seats }} {{ header }}</div>
+<div class="p-2 border border-t-0 border-{{ bg }} mb-4 rounded-b-md">
+  {% if participants | length > 0 %}
+    {% for rower in participants %}
+      {{ rower.name }} <span class="hidden">(angemeldet seit {{ rower.registered_at }})</span><br />
+    {% endfor %}
+  {% else %}
+    {{ text }}
+  {% endif %}
+</div>
+{% endmacro box %}