persistNetworkAutoScanIntent

Persists the user's intent to auto-scan the network on next screen entry without flipping the active scan flag. Used by the Connections screen when it must defer the actual scan start until after the system permission grant dialog resolves. When enabled is true, also clears bleAutoScan so persisted state mirrors the runtime mutual-exclusion invariant (at most one of bleAutoScan / networkAutoScan may be true).