The incremental watch-sync (run_plex_watch_sync) learned a movie's watched
transition only from the history feed + onDeck. When a movie is finished on
Plex (commonly by scrubbing through the end credits) Plex sets viewCount>0,
clears viewOffset and DROPS it from Continue-Watching, so onDeck no longer
lists it (and onDeck can only ever ADD an in-progress row, never resolve one),
while a scrub-to-end frequently emits no history session row. The stale local
status='new', position>0 row then survived until the DAILY full reconcile —
which is why movies kept showing "in progress".
Add _reconcile_inprogress_movies: for each local in-progress MOVIE that Plex's
onDeck no longer lists, read its current per-account viewCount/viewOffset with
one metadata() call and apply it via the shared _pull_apply, flipping to
watched when Plex says so. Bounded by a probe cap (100), most-recently-touched
first; episodes are left to onDeck/history. No-signal rows are preserved (an
un-watch stays the daily reconcile's job).
Tests: watched-flip, onDeck+episode skip, and no-signal-preserved.
peter
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