0.9.1-alpha.47

Patch Changes

• 4d1d3dd: Surface — a ground for other things to sit on

  One node and no slots, which is the point: a surface is a fill, a corner and some padding, and every other component in this library that needed those three has been writing them out again. It is the smallest thing here and the most reused.

  It is not a Card. A card has decided things for you — it is always lifted, it has a header and a footer, and its levels carry an emphasis. A surface has decided nothing.

  A ladder, not four emphases. primary sits on the page, secondary inside a primary, tertiary inside a secondary, and each is a token the theme already names — so a nest is legible in both modes without anyone choosing greys. Three is as deep as that reading survives; a fourth would be a shade nobody could place. ghost at the end is not a level but the absence of one.

  Elevation is asked for rather than tied to the variant, and defaults to true for primary alone: a shadow under a ground that barely differs from the page reads as dirt rather than as height. Whether a ground is above the one under it is the layout's business — the same secondary is flat inside a card and lifted floating over a list.

  Its props list is six lines because everything else a surface could be is already a style prop. There is nothing here a prop had to be invented for.

  Card, Popover, Accordion and Dialog should read it. None of them does yet: that is a refactor rather than a component, and it wants its own change so a regression in one of the four is not hidden inside a new file.