Finalize alerts tab labels

FuelBoard/AlertsView.swift

@@ -146,7 +146,7 @@ struct AlertsView: View {
                 }
 
                 Section {
-                    Toggle("Enabled", isOn: $enabled)
+                    Toggle("Cheapest station", isOn: $enabled)
                     Picker("Fuel", selection: $fuel) {
                         ForEach(FuelType.allCases) { fuel in
                             Text(fuel.displayName).tag(fuel)
@@ -167,7 +167,7 @@ struct AlertsView: View {
                             .foregroundStyle(.secondary)
                     }
                 } header: {
-                    Text("Cheapest station")
+                    Text("Proximity alerts")
                 } footer: {
                     Text("When you approach a station that is the cheapest within the radius, FuelBoard sends a notification — even with the app closed. Nearby stations selling \(fuel.displayName.lowercased()) are watched — favourites get priority — and each station alerts at most once per hour. Follow search mirrors the Stations-tab distance, capped at 8 miles for reliable geofencing. Smaller radii ping more often but later; larger radii ping rarely in town but earlier from afar.")
                 }