Aki: Improve Overdue Task Listing Format and Add Interactive Completion Commands

When I asked Aki to “list my overdue tasks,” the assistant provided all the info, but the response was a bit cluttered and hard to digest. It would be much more user-friendly if overdue tasks were listed in a clean, numbered format like:

Task A

Task B

Task C

Even better—allow follow-up commands like:

“Mark tasks 1, 2, and 3 as complete”

or

“Reschedule task 4 to tomorrow.”

This would help users (especially those who fall behind now and then!) quickly clean up and reorganize overdue tasks more efficiently.