(Android) Select an existing task to add to calendar

Right now, we can only create a new task when adding a time block on the calendar.

If we want to add an existing task, we have to go find it in the app and apply a date. It would be much faster to be able to select an already-existing task to add than navigate to the goal that task lives in, find it, and assign a date.

If we could create a time block and add an existing task (and not just create new ones), that would be great.