Sleep sessions that grow over time (partial data synced mid-sleep, full
data available after waking) were permanently stuck as partial records
in Health Connect. The sync cursor advanced past the session's start
after the first sync, so the full session was never re-processed.
Fix with two mechanisms:
- Set clientRecordId per sleep session (deterministic from device +
start hour) with clientRecordVersion = stage count, enabling HC's
native upsert: re-inserting the same session replaces partial data
with the full record.
- Hold the sync cursor behind sessions that ended less than 6 hours
ago (likely still in-progress), so they get re-processed on the
next sync with more complete data.
Replace single sync-time ZoneOffset with ZoneId, resolving the correct
offset per record timestamp via ZoneId.rules.getOffset(instant). Fixes
wrong offset metadata on records crossing DST boundaries (e.g. sleep
sessions starting in CET and ending in CEST).
Also fixes leading space in device model name after manufacturer prefix
strip.