HaapiStepperTextFormFieldUI
Renders the built-in text input for a HAAPI text/username 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 you let HaapiStepperFormFieldUI pick the field component automatically — reach
for this one only to place a specific field yourself in a custom layout:
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