super3 / water / 26671241851

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Add offline sync queue on the watch

Logging on the watch failed when the phone was locked/out of range: the Core
app couldn't wake the companion app to record the log, so the entry was lost and
the ring later reverted to the phone's stale total.

Make the watch the durable buffer:
- Watch keeps a persistent queue of pending "+8" ops, each with a unique
  monotonic seq (seeded from the clock so it survives reinstalls) and the
  timestamp it was logged. The total updates optimistically; an op is removed
  only when the phone ACKs it. Flush retries on launch, on a ~10s timer while
  open, and whenever a message arrives. A "syncing N" indicator shows pending.
- The watch ignores the phone's echoed TodayOz while its queue is non-empty,
  which fixes the revert. DOWN cancels the most recent unsynced add, else removes
  the phone's last entry online.
- Phone de-dups by seq (high-water mark) so a lost-ACK resend can't double-count,
  and records each entry at the watch's timestamp (LogTs) so offline logs land on
  the right day. Adds WatchSeq (10005) + LogTs (10006) message keys.

Verified on device: a glass logged while the phone was locked synced on
reconnect, recorded at the watch timestamp, with no errors.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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