createTheme

A theme built on top of the built-in one — the way an app feeds its own design tokens to the canvas:

``ts const brand = createTheme("default", { colors: { light: { blue: { ...DEFAULT_THEME.colors.light.blue, solid: tokens.brandBlue } } }, }) ``

Starting from DEFAULT_THEME rather than from nothing is what keeps every colour name defined — see registerColorsFromThemes for why dropping one is a data-loss bug rather than a missing swatch.