Features: 1) Add required static asset links for Select2 styles and scripts; 2) Enhance autocomplete list filter with improved styles and functionality;

Fixes: 1) Fix indentation inconsistencies in HTML template;

Extra: 1) Refactor inline script for improved readability;

core/templates/admin/autocomplete_list_filter.html

@@ -1,7 +1,17 @@
 {% load i18n static %}
 
+<link rel="stylesheet"
+      href="{% static 'admin/css/vendor/select2/select2.css' %}"/>
+<link rel="stylesheet"
+      href="{% static 'admin/css/autocomplete.css' %}"/>
+
+<script src="{% static 'admin/js/vendor/select2/select2.full.js' %}"></script>
+<script src="{% static 'admin/js/jquery.init.js' %}"></script>
+<script src="{% static 'admin/js/autocomplete.js' %}"></script>
+
 <div class="filter-autocomplete">
-    <select name="{{ spec.lookup_kwarg }}"
+    <select
+        name="{{ spec.lookup_kwarg }}"
         id="id_{{ spec.lookup_kwarg }}"
         class="admin-autocomplete"
         style="width:90%;"
@@ -17,11 +27,8 @@
     </select>
 </div>
 
-<link rel="stylesheet" href="{% static 'admin/css/autocomplete.css' %}"/>
-
-{# Only our own bootstrap script, using django.jQuery #}
 <script>
-    (function ($) {
+  (function($) {
     $('.admin-autocomplete').djangoAdminSelect2();
   })(django.jQuery);
 </script>