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/ContentView.swift

@@ -150,6 +150,7 @@ struct ContentView: View {
                 alertsRadiusKM: alertsRadius,
                 testAlertResult: monitor.lastTestResult,
                 onTestAlert: { monitor.sendTestNotification() },
+                onPlainTestAlert: { monitor.sendPlainTestNotification() },
                 onShowOnboarding: { showOnboarding = true }
             )
             .tabItem { Label("Settings", systemImage: "gearshape.fill") }