feat(vue): pause command chrome while a dialog is open

[omegent-app]

A command that asks a question before the real work shows the spinner and the waiting toast while the person is still deciding. The button looks busy before anything has started.

Command.suspendWaiting(effect) pauses both for that effect. The button stays disabled, so a second click cannot start another run. When the effect finishes, the spinner returns and the waiting toast starts its one-second delay again for the rest of the command. An interrupt restores the depth and clears the toast.

Each command owns a WaitingGate. command.waiting is false while the depth is positive. command.blocked stays on for the whole run. WithToast dismisses the waiting toast above depth 0 and arms a fresh delay when the depth returns to 0. Outside a command the default gate is inactive, so suspendWaiting runs the effect unchanged.

const decision = yield* Command.suspendWaiting(ask(pickupDate))
yield* close(orderId)

Stream commands pause the spinner only. withDefaultToastStream is unchanged. confirmOrInterrupt is unchanged: native window.confirm blocks the thread, so that spinner does not paint.

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commit: 47b41cd