zoom key?

[mattvenn]

maybe a way to have a 'bigger' canvas is just make it easier to draw small.
this design by Daniel shows how small you can go with care: https://twitter.com/ea4gpz/status/1624701599640612865

so maybe z for zoom and where the mouse is will double or triple in size.

[urish]

zooming is part of #4 - so if we want to track those feature as individual issues (which I think is better), let's close that issue.

Regarding zoom key - do you want Siliwiz to eventually be useful on tablets? In that case, we need to design features like zooming with touch screen in mind.

Also:

1. should zooming affect the cross section view?
2. how do you zoom out?
3. do we want to support panning while you are zoomed-in?