projects/common/stepper/stepper-config.ts
Override the default *cngxStepError template app-wide. The slot renders the per-step validation reason on the skins with a label area (classic / stripe-status-rich). Per-instance directive still wins; this moves the cascade middle tier.
*cngxStepError
withStepErrorTemplate(template: TemplateRef)
TemplateRef
CngxStepperConfigFeature