Add sync functionality for prerequisite users and enhance result display

atlas/templates/atlas/collection_detail.html

@@ -52,6 +52,15 @@
                     </li>
                 {% endfor %}
             </ul>
+
+        <p>
+            <button
+                title="Sync users from all prerequisite collections into this collection"
+                hx-post="{% url 'atlas:collection_sync_prerequisite_users' collection.pk %}"
+                hx-swap="outerHTML"
+                class="btn btn-sm btn-secondary"
+            >Sync prerequisite users</button>
+        </p>
         {% endif %}
     </div>
 
@@ -128,14 +137,6 @@
             <div id="user-list"></div>
 
         </details>
-        <p>
-            <button
-                title="Sync users from all prerequisite collections into this collection"
-                hx-post="{% url 'atlas:collection_sync_prerequisite_users' collection.pk %}"
-                hx-swap="outerHTML"
-                class="btn btn-sm btn-secondary"
-            >Sync prerequisite users</button>
-        </p>
     {% endif %}
     {% include 'exam_overview_js.html' %}
 {% endblock %}

atlas/templates/atlas/partials/sync_prereq_result.html

@@ -0,0 +1,12 @@
+<div class="alert alert-success">
+  <strong>Two-way sync complete</strong>
+  <p>Total added: {{ total_added_cid }} CID(s), {{ total_added_user }} user(s), {{ total_added_cid_groups }} CID group(s), {{ total_added_user_groups }} user group(s).</p>
+  <details>
+    <summary>Per-collection changes ({{ per_collection_added|length }})</summary>
+    <ul>
+      {% for pk, added_cid, added_user, added_cid_groups, added_user_groups in per_collection_added %}
+        <li>Collection {{ pk }}: +{{ added_cid }} CID(s), +{{ added_user }} user(s), +{{ added_cid_groups }} CID group(s), +{{ added_user_groups }} user group(s)</li>
+      {% endfor %}
+    </ul>
+  </details>
+</div>