Test alert uses real data: actual cheapest station within radius

The first Settings test button no longer sends a hardcoded placeholder —
it runs the same criteria as a live alert (monitored fuel, alert radius,
current location) against the loaded stations and sends the REAL station
name, brand and price. Result line shown under the button; graceful
message when no stations or no sellers within radius.

FuelBoard/ProximityMonitor.swift

@@ -11,6 +11,7 @@ import SwiftUI
 final class ProximityMonitor: NSObject, ObservableObject, @preconcurrency CLLocationManagerDelegate, UNUserNotificationCenterDelegate {
     @Published var monitoredStationIDs: [String] = []
     @Published var lastAlert: String?
+    @Published private(set) var lastTestResult: String?
 
     private let manager = CLLocationManager()
     private var stations: [FuelStation] = []
@@ -176,19 +177,49 @@ final class ProximityMonitor: NSObject, ObservableObject, @preconcurrency CLLoca
         lastAlert = "\(brand) · \(String(format: "%.1fp", price)) · \(unit.format(radiusKM)) radius"
     }
 
-    /// Fires a sample local notification shaped exactly like a real price
-    /// alert, for the Settings "test" button. Uses a placeholder station so
-    /// the user can see the alert format without a real entry event. Tapping
-    /// it does what tapping any FuelBoard alert does — opens the app.
-    static func sendTestNotification(fuel: FuelType, radiusKM: Double) {
+    /// Fires a test alert built from REAL data: the cheapest station selling
+    /// the monitored fuel within the configured alert radius of the current
+    /// location — the same criteria a live geofence entry would apply, minus
+    /// the geofence itself. Uses the monitor's live state (fuel, radius,
+    /// stations) so the notification reflects the Alerts-tab configuration.
+    func sendTestNotification() {
         let unit = FuelStore.loadDistanceUnit()
-        let content = UNMutableNotificationContent()
-        content.title = "Cheapest \(fuel.displayName) nearby: Sample Filling Station"
-        content.body = "Sample Filling Station is the cheapest within \(unit.format(radiusKM)) at 132.9p. Tap to open."
-        content.sound = .default
+        let location = FuelStore.loadLocation()
+        let sellers = stations.filter { $0.prices[fuel] != nil }
 
-        let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: nil)
-        UNUserNotificationCenter.current().add(request)
+        // Cheapest within radius, judged around the current location —
+        // identical to handleEntry's withinRadius logic.
+        let inRadius = sellers.filter { station in
+            guard let location else { return true }
+            return station.distanceKM(to: location.lat, lng2: location.lng) <= radiusKM
+        }
+        let candidate = inRadius.min { ($0.prices[fuel] ?? .infinity) < ($1.prices[fuel] ?? .infinity) }
+
+        if let candidate, let price = candidate.prices[fuel] {
+            let brand = candidate.brand.isEmpty ? candidate.name : candidate.brand
+            let content = UNMutableNotificationContent()
+            content.title = "Cheapest \(fuel.displayName) nearby: \(brand)"
+            content.body = "\(candidate.name) is the cheapest within \(unit.format(radiusKM)) at \(String(format: "%.1fp", price)). Tap to open."
+            content.sound = .default
+            let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: nil)
+            UNUserNotificationCenter.current().add(request)
+            lastTestResult = "\(fuel.displayName) · \(brand) · \(String(format: "%.1fp", price)) · radius \(unit.format(radiusKM))"
+        } else {
+            // No real candidate (no stations loaded yet, or none sell the
+            // monitored fuel) — still fire so delivery is testable, but say
+            // why the real criteria found nothing.
+            let content = UNMutableNotificationContent()
+            content.title = "FuelBoard test alert"
+            content.body = sellers.isEmpty
+                ? "No station data loaded yet — open the Stations tab first, then retry."
+                : "No \(fuel.displayName.lowercased()) station within \(unit.format(radiusKM)) of you."
+            content.sound = .default
+            let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: nil)
+            UNUserNotificationCenter.current().add(request)
+            lastTestResult = sellers.isEmpty
+                ? "No stations loaded — open the Stations tab first"
+                : "No \(fuel.displayName.lowercased()) seller within \(unit.format(radiusKM))"
+        }
     }
 
     /// Fires a notification with NO criteria checks at all — no geofence, no