FIX: correctly render unicode in channel page title (#29653)

Before this fix we would render the emoji as text, eg: `🐱`

plugins/chat/app/serializers/chat/channel_serializer.rb

@@ -11,6 +11,7 @@ module Chat
                :chatable_url,
                :description,
                :title,
+               :unicode_title,
                :slug,
                :status,
                :archive_failed,
@@ -53,6 +54,10 @@ module Chat
       object.name || object.title(scope.user)
     end
 
+    def unicode_title
+      Emoji.gsub_emoji_to_unicode(title)
+    end
+
     def chatable
       case object.chatable_type
       when "Category"