44px buttons with 35px icons read small on a 540px panel, and a stack's
members were 12px inside a 35px box — unreadable, which is the whole job of
the collapsed form. 56/44 now, and the member icons give back the border and
padding that were being subtracted from them as well as the grid spacing.
Both numbers live in Config so this is a setting rather than a rebuild, with
spin boxes in Settings > Dock. Two numbers and not one ratio: the button is
the row's height and the icon is what you see, and fixing the ratio would
mean either cramped icons in a tall row or icons overflowing a short one.
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