Queue, current index, position, and shuffle flag are snapshotted to a
new app_state playback_session table on pause, track change, and queue
mutation (never on position ticks). On launch the session is restored
paused into the mini player; the first play seeks to the saved
position. Plain file paths that no longer exist are dropped, an
explicit stop or mini-player dismiss clears the snapshot, and the
installation-restore guard wipes it alongside the download queue.
zarzet
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