[NFR] Add button 'Now' to timeline screen

[hsingfoo]

In the timeline screen, one can use the left/right arrows in the upper left to jump days.

When the zoom scale is e.g. 15 minutes, and one is scrolling manually, it is hard to find the current time (red marker) back (a lot of scrolling if scale is set to e.g. 5 minutes).

A button that instantly jumps back to the current time with the red marker in the middle would be comfortable, preserving the zoom/scale factor.

[hsingfoo]

Thanks, a great help.