UX: Show category badge on enqueued posts

app/serializers/queued_post_serializer.rb

@@ -9,9 +9,19 @@ class QueuedPostSerializer < ApplicationSerializer
              :rejected_by_id,
              :raw,
              :post_options,
-             :created_at
+             :created_at,
+             :category_id
 
   has_one :user, serializer: BasicUserSerializer, embed: :object
   has_one :topic, serializer: BasicTopicSerializer
 
+  def category_id
+    cat_id = object.topic.try(:category_id) || object.post_options['category']
+    cat_id.to_i if cat_id
+  end
+
+  def include_category_id?
+    category_id.present?
+  end
+
 end