Toast

Bottom right, never takes focus. Dismisses after five seconds; error toasts stay until closed. Alt+T focuses the stack for keyboard users, Escape dismisses it. Surface on a soft shadow with a border-strong edge, 12px radius. Undo is the link variant inside the toast; every destructive or bulk action gets one. Mount one Toaster per app in layout.tsx.

import { toast } from "@stocklots/ui-components/components/sonner";

toast("3 lots archived", { action: { label: "Undo", onClick: restore } });