Pick trip dates without waiting on everyone

Everyone adds a date or two that would work for them. Tripti shows where they overlap, so the leader can see which window has the most support without scrolling back through the group chat.

The leader proposes up to three options and the group answers works, maybe or can't. Once half the group or more says a window works, it's ready to lock. If the trip can't wait, the leader can lock sooner, or set a time for the lock so people still have a chance to weigh in.

Sharing dates isn't a commitment. Nothing is final until the dates lock, and then the same group moves on to where to stay and what to do.