OptionaldetailsFull inspectable payload (e.g. the pretty-printed server error body).
OptionalidId of the matching notification-log entry, when the toast was logged.
OptionalmessageOptional monospace detail line, typically the admin API error message.
Bold headline, e.g. the action that succeeded or failed.
Visual tone: success (green check), error (red cross), or warning (amber triangle, non-blocking heads-up).
Payload describing one notification.