A single-slot, self-expiring toast (8s, read-time expiry so the state
stays a pure function of the clock) renders top-centre of the canvas —
the one band with a single occupant, stacking under the align toolbar
and clamped clear of the tool column. Paint sits above panels and the
diagnostics notice, below the missing-font modal, with the press tier
mirrored in both hosts through one shared flow arm; the deadline folds
into the shared frame bookkeeping so each host wakes exactly once at
expiry. The online conflict auto-accept now shows the existing
localEditPreserved string (all 15 locales) naming Undo as the way
back; collab sessions keep their panel notice instead of saying it
twice, and an identity switch dismisses the previous account's toast.
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