HaapiStepperSelectFormFieldUI
Renders the built-in <select> dropdown for a HAAPI select field, wired to the form's state.
Must be rendered inside a HaapiStepperFormUI (it reads formState from the form context, so it throws
outside one). Normally HaapiStepperFormFieldUI picks it automatically — use it directly only to place
the select yourself in a custom layout:
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