In-article buttons (the {contact:} trigger and raw <button>s, not the
editor chrome) get a / slanted parallelogram clip-path in the nitro
theme: nav-tab-style bezier sweeps at the obtuse corners, small arcs at
the sharp ones, fixed 1.7em height so every button shares one shape.
Base stylesheet: the contact envelope's line-height no longer inflates
the button, and article buttons get a slight scale(1.01) hover lift.