ResumePositionsStore — SharedPreferences-lite, JSON-blob keyed by
videoId. Caps at 500 entries, prunes oldest on add. Skips trivial
positions (< 5s) and clears near-end (within 5s of duration) so a
finished video doesn't auto-resume to its credits.
PlaybackService — 5s polling job + onIsPlayingChanged(false) +
onDestroy capture write player position via NowPlaying.streamUrl →
videoId. Runs on Main so the player read is thread-safe; store
write is SP.apply() async.
setPlayingFrom — when caller passes startPositionMs=0L AND
Settings.autoResume is on, lookup the saved position and use it.
Surface-handoff path (inline ↔ fullscreen) is untouched —
MediaController already holds its own position across surfaces.
This only fires on fresh opens (cold start, app update, video
re-tap from history).
Kayos
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