Same watch page, the player pane becomes a stage. When the item is audio, the 16:9 pane shows the cover on an ambient blur of itself, with a live visualiser. The style picker sits in the pane's corner. The right column is the queue instead of episodes: what played, what's playing, what comes next, dragged to reorder; it keeps going with the album, playlist or channel it came from. Try it: click Bars / Spectrum / Scope / Cover.
Desktop
Phone: the stage is the top of the page, then the queue under Queue / Sources / Output, as the watch page's tabs today. Lock the phone and the dock mini-player keeps the queue going. Left: playing. Right: the queue tab.
The TV gets the stage as a video flux. The server draws the same visualiser with ffmpeg (showcqt, showspectrum, avectorscope) over the cover and streams it as HLS, so Chromecast, DLNA and AirPlay play it like any episode: no custom receiver app, no new cast path. The style picker changes it in place, as the quality picker does today. The browser keeps the queue and the controls.
TV
Browser, while casting