feat: render DM conversations as threaded view on mention tab

views/activitypub-notifications.njk

@@ -48,6 +48,18 @@
     </form>
   </div>
 
+  {% if tab == "mention" %}
+    {# DM thread view — grouped by conversation #}
+    {% if conversations and conversations.length > 0 %}
+      <div class="ap-dm-conversations">
+        {% for conv in conversations %}
+          {% include "partials/ap-dm-thread.njk" %}
+        {% endfor %}
+      </div>
+    {% else %}
+      {{ prose({ text: "No direct messages yet." }) }}
+    {% endif %}
+  {% else %}
     {% if items.length > 0 %}
       <div class="ap-timeline">
         {% for item in items %}
@@ -66,4 +78,5 @@
     {% else %}
       {{ prose({ text: __("activitypub.notifications.empty") }) }}
     {% endif %}
+  {% endif %}
 {% endblock %}