The current generation of TimedMediaHandler wrapper interface uses OOUI for the dialog, and the interior bits in the player are left to video.js's defaults with a few tweaks. We're going to want to do a quick check on the new "Codex" design system and see if style or interaction changes should be made. Consolidating more with MediaViewer's popup interface may also be desireable; at the least the two should feel consistent with each other.