feat: add shared task assignments and quick win sorting

app/templates/tasks/task_form.html

@@ -35,6 +35,13 @@
         {% for error in form.assigned_user_id.errors %}<small class="error">{{ error }}</small>{% endfor %}
       </div>
 
+      <div class="field">
+        {{ form.assigned_user_secondary_id.label }}
+        {{ form.assigned_user_secondary_id() }}
+        <small class="muted">Wenn du hier noch jemanden auswählst, zählen die Punkte pro Person halbiert.</small>
+        {% for error in form.assigned_user_secondary_id.errors %}<small class="error">{{ error }}</small>{% endfor %}
+      </div>
+
       <div class="field">
         {{ form.due_date.label }}
         {{ form.due_date() }}