feat(datepicker): drop native datepickers in favor of AirDatePicker for better compatibility

As Firefox (still) doesn't support month input type

app/templates/extends/offcanvas.html

@@ -5,6 +5,7 @@
   <button type="button" class="btn-close" data-bs-dismiss="offcanvas" aria-label={% translate 'Close' %}></button>
 </div>
 <div id="generic-offcanvas-body" class="offcanvas-body"
-     _="install init_tom_select">
+     _="install init_tom_select
+        install init_datepicker">
   {% block body %}{% endblock %}
 </div>