fix: the reconcile scan's return type names its settled sections; the composer stays at its size ceiling

backend/app/plex/watch_sync.py

@@ -72,7 +72,7 @@ def _rk_to_id(db: Session) -> dict[str, int]:
 
 def _scan_plex_states(
     db: Session, plex: PlexClient
-) -> tuple[dict[int, tuple[str, int, datetime | None, datetime | None]], int, bool, set[str]]:
+) -> tuple[dict[int, tuple[str, int, datetime | None, datetime | None]], int, set[str], set[str]]:
     """Scan the enabled movie/show sections and return ``{item_id: (status, pos, watched_at,
     prog_at)}`` for every mirrored leaf Plex holds a watch signal for, the scanned-leaf count, the
     keys of the sections SETTLED — walked to the server's total (or said empty by a server we mirror