ClassSync v0.3.22

What's changed

• Reliable task state across devices — completing, reopening, dismissing,
  or restoring a task now triggers an immediate best-effort account sync.
• Last task action wins — task status has its own mutation timestamp, so a
  newer summary refresh can no longer overwrite an explicit action made on
  another device.
• Concurrent-device safety — encrypted snapshot revision conflicts are
  re-read and retried before falling back to the normal later sync.
• Clearer task priority — pending tasks appear before completed and
  dismissed history, while deadlines continue to order tasks within each
  state.

Release notes

• Existing tasks remain compatible; their first explicit status action adds
  the new synchronization timestamp automatically.
• No local database or relay migration is required for this release.
• Built and validated locally without GitHub Actions.