Unclear what it means to resize the shelf in the desktop app

[mmcgrana]

It's unclear what it means to resize the shelf in the desktop app, especially since it doesn't have scroll bars in any configuration nor does it enforce aspect ratio.

My suggestion until we have something designed to handle resizing is: force a fixed size of the window that yields a content space with aspect ratio equal to the full shelf (and show the full shelf in that content space).