applyEventFirmwareNodeEventDefault

Applies the node-event notification default for the connected firmware, as a single atomic update.

The decision reads both nodeEventsEnabled and nodeEventsAutoDisabledForEvent and conditionally writes both, so it cannot be expressed as separate reads and setter calls: the setters are asynchronous and the StateFlows lag them, so a caller doing it by hand can read stale values or clobber a concurrent user toggle.

On event firmware, node events are disabled and the restore is claimed — but only if they were actually on, so a user who had already turned them off is not re-enabled later. On vanilla firmware, a previously claimed restore is honored and released.