SignalInfo
fun SignalInfo(modifier: Modifier = Modifier, node: Node, contentColor: Color = MaterialTheme.colorScheme.onSurface)(source)
Renders the node's signal quality, or nothing when it has no SNR reading to rate.
Presence comes from Node.snrOrNull/Node.rssiOrNull, not from threshold comparisons: the previous rssi < 0 gate hid the whole row for a genuine 0 dBm reading, and snr < 100f would have hidden any reading at or above 100 dB.