Visible sentinel pauses

Makes the Network Sentinel's pauses visible.

By default the sentinel pauses its probes on battery power (and in Low Power Mode, and while a Speed Test runs) — but it paused silently, so an unplugged Mac showed an empty Network tile and a blank Health window that looked broken rather than resting.

Now a paused sentinel says so, everywhere: the Network Health header reads "Paused — on battery power · resumes automatically", the tile dot's tooltip explains the same, and your recorded history stays fully browsable while paused. Plug back in (or flip "Pause on battery" off in Settings → Network sentinel) and live probing resumes on the next cycle.

Auto-updates via Sparkle; also on Homebrew: brew upgrade --cask mojo-pulse.