Both test buttons carry real station coords; map status surfaced

- Plain test notification now picks the nearest station selling the
  monitored fuel and carries its real name, price, distance and
  coordinates (was a static no-station notification)
- addAlertRequest reports whether the map snapshot attached or why it
  failed, appended to the Settings result line instead of silently
  delivering a notification without the embedded map
- Settings routes both test buttons through the live monitor

FuelBoard/SettingsView.swift

@@ -18,6 +18,9 @@ struct SettingsView: View {
     /// Drives the real-data test — ContentView routes this to the live
     /// ProximityMonitor so the test uses its actual stations/fuel/radius.
     var onTestAlert: () -> Void = {}
+    /// Drives the plain test (no criteria) — routed to the live monitor so it
+    /// can carry a real station's name, price and coordinates.
+    var onPlainTestAlert: () -> Void = {}
     var onShowOnboarding: () -> Void = {}
 
     @StateObject private var tipStore = TipStore()
@@ -72,14 +75,14 @@ struct SettingsView: View {
                             .foregroundStyle(.green)
                     }
                     Button {
-                        ProximityMonitor.sendPlainTestNotification()
+                        onPlainTestAlert()
                     } label: {
                         Label("Send plain test notification", systemImage: "bell.slash.fill")
                     }
                 } header: {
                     Text("Alerts")
                 } footer: {
-                    Text("The first button applies the real criteria — cheapest \(alertsFuel.displayName.lowercased()) station within \(distanceUnit.format(alertsRadiusKM)) of you — and sends the actual station's name and price. The second fires with no criteria at all, just to verify a notification appears and tapping it opens FuelBoard.")
+                    Text("The first button applies the real criteria — cheapest \(alertsFuel.displayName.lowercased()) station within \(distanceUnit.format(alertsRadiusKM)) of you — and sends the actual station's name, price and coordinates. The second fires with no criteria at all (nearest seller), still carrying a real station, just to verify a notification appears and tapping it opens directions.")
                 }
 
                 Section {