The detail screen gave no hint of what pressing Play would do with the
file: which audio track and which subtitles the player would start with,
or the picture format. Changing tracks meant starting playback first.
The action row now ends with a status line — picture labels, then the
audio and subtitle rows the player will select — computed by the player's
own selection ladder (TrackSelectionService) over the server's stream
rows, so it agrees with what the player then does. Select opens a
pre-play chooser with the track sheet's two columns; Play and rail
activation pass the pick to the player as its navigation-tier preference,
and a pick carries across episodes by semantics, forced-ness included.
Plex listings carry no stream rows, so a focused episode is probed once,
debounced, and cached for the screen.
Along the way: MediaStream keeps the server's `selected` apart from the
container `default` flag (they were OR'd, so the account's pick was
indistinguishable from the default track); the overlay sheet host no
longer overrides a row that claimed focus itself.
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