Scope cheapest/RAG/TOP to alert trigger radius in app + widget; header shows 'within X km'; falls back to full fetch when radius pool empty

FuelBoard/StationsView.swift

@@ -11,6 +11,7 @@ struct StationsView: View {
     @Binding var stationLimit: Int
     let cheapestPrice: Double?
     let location: Coordinate?
+    let radiusKM: Double
     let favouriteIDs: Set<String>
     var onToggleFavourite: (FuelStation) -> Void = { _ in }
 
@@ -18,9 +19,15 @@ struct StationsView: View {
         NavigationStack {
             List {
                 Section {
-                    Text("\(sortMode == .closest ? "Closest" : "Cheapest") \(selectedFuel.displayName) — tap a station for directions.")
-                        .font(.footnote)
-                        .foregroundStyle(.secondary)
+                    if let location {
+                        Text("\(sortMode == .closest ? "Closest" : "Cheapest") \(selectedFuel.displayName) within \(Int(radiusKM)) km — tap a station for directions.")
+                            .font(.footnote)
+                            .foregroundStyle(.secondary)
+                    } else {
+                        Text("\(sortMode == .closest ? "Closest" : "Cheapest") \(selectedFuel.displayName) — tap a station for directions.")
+                            .font(.footnote)
+                            .foregroundStyle(.secondary)
+                    }
                 }
 
                 Section("Fuel type") {