Alerts: move geofence monitoring status to Settings debug; plain-language footer

FuelBoard/SettingsView.swift

@@ -37,6 +37,9 @@ struct SettingsView: View {
     /// Last CoreLocation region-monitoring failure (monitor.lastRegionError).
     /// Shown in Debug so a silently-failed geofence registration is visible.
     var regionError: String?
+    /// Live geofence count (monitor.monitoredStationIDs.count) — Debug-only
+    /// status; the user-facing Alerts tab no longer exposes fence plumbing.
+    var monitoredCount: Int = 0
 
     @StateObject private var tipStore = TipStore()
     @State private var showTipAlert = false
@@ -199,6 +202,21 @@ struct SettingsView: View {
                     } footer: {
                         Text("Connection shows whether prices come from the official Fuel Finder API or the CSV mirror. Data updated is the latest price change reported by the GOV.UK server itself.")
                     }
+
+                    Section {
+                        if monitoredCount == 0 {
+                            Text("No stations monitored yet — open the Stations tab to load prices first.")
+                                .font(.caption)
+                                .foregroundStyle(.secondary)
+                        } else {
+                            LabeledContent("Geofenced stations", value: "\(monitoredCount)")
+                        }
+                        Text("Favourites for \(alertsFuel.displayName.lowercased()) get priority, then the closest stations selling that fuel fill the rest (18 max, iOS region limit). Each station alerts at most once per hour.")
+                            .font(.caption)
+                            .foregroundStyle(.secondary)
+                    } header: {
+                        Text("Geofence monitoring")
+                    }
                 }
 
                 Section {