The new-task bottom sheet called createTask then, if a date was set,
made a follow-up updateTask to attach the date. If the update failed
(e.g. filesystem error between the two writes) the user was left with
a dateless task and, because transient sync errors are already
suppressed, often no visible error either.
Extend the create_task Tauri command to accept optional date/has_time
fields and pass them through. The frontend now creates the task in one
round-trip. No separate update path needed.