v0.9.0b2

[0.9.0b2]

Added

• Back-date or correct a task completion. The completion dialog now has an
  optional Completed at date/time field (defaults to now) for logging a
  completion in the past — so a floating task's next-due date measures from when
  you actually did it, not from when you got around to logging it. The task
  history list also gains a move date action on each completion row to fix an
  already-recorded entry's timestamp after the fact, without touching its note,
  cost, photo, or who. Backed by a new home_keeper.move_completion service and
  matching websocket command; automations that already react to
  home_keeper_task_completed / home_keeper_task_uncompleted see a move for
  free. (Fixes #143)