CngxStepperComplete

Turns any clickable element into a stepper "Finish" control. Unlike CngxStepperNext (which reflects the commit state and advances), the finish action runs: the directive composes CngxAsyncClick via hostDirectives, so the runner owns the click lifecycle, aria-busy, and the pending-disable exactly as it does on a standalone button. The finish action is fed through the aliased [cngxStepperComplete] input.

Resolves its host like the sibling controls - explicit [host] input falling back to the ambient CNGX_STEPPER_HOST. isActive exposes whether the active step is the last one, so a consumer renders the finish control only on the final step. (completed) emits once after the action resolves successfully.

@if (s.presenter.isLastStep()) {
  <button [cngxStepperComplete]="submit" (completed)="done()">Finish</button>
}