* feat: write variable-bound properties as tokens in exported code
HTML and Tailwind JSX export reference the design tokens a layer is bound to, var(--color-primary) or bg-primary, instead of baking in their values. A binding becomes a reference only where the stylesheet resolves it as the canvas draws it: the layer still draws the value, the token's unit fits the property, and an attribute such as data-theme="dark" can put the element in the layer's mode. Standalone HTML includes the stylesheet for the tokens it uses, compiled into Tailwind's @theme for Tailwind pages.
* refactor: share the collection variable list and tighten token helpers
Read every variable in collection order through one collectionVariables helper built on es-toolkit's compact, used by the stylesheet and the token references, and map padding sides and color channels instead of repeating them.
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