* Choose how long completed one-off tasks are kept: 7 days, 30 days, or never (keep as an archive)
* Backups now include your settings (theme, notification time and early reminder) and restore them on import — handy when switching phones
* Gentle reminder to back up if you haven't done it in a long while
* A repeating task can no longer be checked several times on the same day (no more duplicate history entries)
* Form: "One-off" comes first, and the notification time / early reminder only show when they actually apply
* The completed tasks section now has a heading, and a postponed task keeps a colour consistent with its due date
