Add template animation editor

src/player/player-page-announcements.js

@@ -1,6 +1,10 @@
 // Announcement overlay polling and rendering helpers.
 
 (function () {
+  if (window.__pulseThumbnailPreview) {
+    return;
+  }
+
   var announcementLayer = null;
   var announcementRefreshTimer = null;
   var announcementPollTimer = null;