MarkManagement{Connected,Disconnected} and MarkSignal{Connected,
Disconnected} fired notifyStateChange unconditionally. The connect
goroutine re-marks the same state on every health-check cycle, so a
steady "connected -> connected" re-mark pushed a full SubscribeStatus
snapshot to every consumer each time — flooding the desktop UI (and its
tray) with identical Connected snapshots.
Guard each with an early return when neither the state nor the error
actually changed, so only real transitions wake SubscribeStatus
subscribers. The notifier already deduplicates, so collapsing both calls
under one guard is safe.
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