Notification de-duplication

“Save draft” five times should not mean five identical toasts. Idempotent notifications keep the stack calm.

Controls

Deduplicate

When a toast is created with a stable id, subsequent calls with the same id update the existing toast (and can pulse to acknowledge the repeat) instead of pushing another card.

Turn deduplication off to see the naive stack grow. Turn it on and mash Save draft — one toast, refreshed in place.