Add "today" vertical line to timeline shape in whiteboard

Who would benefit?

All whiteboard users using the timeline shape

What impact would it make?

This would allow users to maintain visibility into where "today" falls on the timeline for greater context on progress and feasibility of plans.

How should it work?

Add the option to show a "today" vertical line from the timeline, similar to the line that is shown in Aha! Roadmaps views today. It should be able to be extended vertically to span all data on the whiteboard.