Interruptions are engineered to be calm, and the chrome still carries the who — a sheet arrives with its author named in the header and a neutral edge marking that the panel belongs to someone. Work is reviewed beside the page, never on top of it; Escape always works; the page behind never scrolls away.
The sheet — live
The command bar
⌘K anywhere. Verbs first, doors second, questions always last resort.
The toast & the stop
A toast never asks. A dialog only ever asks one thing, and the safe word is always plain.