Downloaded episodes never showed the partially-watched progress bar, so a
user resuming offline could not tell which episode they had started.
Offline playback already records progress: the tracker queues a progress
action and emits a WatchStateNotifier event, and DownloadProvider hydrates
those rows back into WatchStateStore on load. EpisodeCard consumed that
state via withFreshWatchState but then passed progressAvailable: false to
WatchedIndicator for offline cards, a guard left over from before offline
progress tracking existed. Downloaded movie cards (MediaCard) never had the
guard and already showed the bar.
Drop the guard and the now-unused WatchedIndicator.progressAvailable flag.
close#2236
edde746
2efd300a5f