Every map has zoom buttons

A map with no zoom affordance is a map a visitor without a scroll habit cannot move. Zoom and compass buttons are now on by default, everywhere, restyled to whatever design system the map is sitting in.

• createMap, new Unmap, useUnmap, the React and Vue components and both registry lanes all get them without asking
• controls: false for a bare canvas; controls: { position: 'bottom-left' } to move them
• zero radius, hairline rules, no shadow, and the glyphs invert in dark mode