FEATURE: Add user preference for title counter mode (#7364)

app/serializers/current_user_serializer.rb

@@ -43,7 +43,8 @@ class CurrentUserSerializer < BasicUserSerializer
              :hide_profile_and_presence,
              :groups,
              :second_factor_enabled,
-             :ignored_users
+             :ignored_users,
+             :title_count_mode
 
   def groups
     object.visible_groups.pluck(:id, :name).map { |id, name| { id: id, name: name.downcase } }
@@ -89,6 +90,10 @@ class CurrentUserSerializer < BasicUserSerializer
     object.user_option.dynamic_favicon
   end
 
+  def title_count_mode
+    object.user_option.title_count_mode
+  end
+
   def automatically_unpin_topics
     object.user_option.automatically_unpin_topics
   end