Header blocks should wrap better for a narrow browser

[almccon]

A common use case for me is to use Maperture with two "phone" views, and then I often resize my browser window to get rid of all the wasted space I have when I do this. But unfortunately, the header bar doesn't wrap very well when my window gets so narrow, so I can't actually see or access the zoom/lat/lon display on the left or the "add map" or "copy image" buttons on the right.

Could we make the header bar collapse differently when the window is this narrow?