* fix(design-jsx): say what gradient helpers expect when stops are not an array
An AI agent called linearGradient with something other than an array of stops, and render failed with 'stops.map is not a function', which does not tell it how to fix the call. The helpers now validate their stops with Valibot and name the expected form, and the authoring reference shows the signature.
* fix(design-jsx): describe stops that cannot be shown as JSON
Review follow-up. JSON.stringify throws on a bigint or a circular object, so such a call failed with that error instead of the gradient's expected form.
* fix(design-jsx): word gradient stop errors from the Valibot issue
Review follow-up. The message now names the helper as a call, as the paint helper option warnings do, and ends with Valibot's description of what was wrong, which already says what it received without serializing the value. A stop that is neither [color, position] nor { color, position } names both forms and its index.
6a05e30f15