Show return distance on station rows

Shared/FuelStore.swift

@@ -1722,11 +1722,23 @@ struct StationDistanceDisplay: Equatable {
         return isApproximate ? "Approx. \(text)" : text
     }
 
+    /// Row/sheet label that keeps the one-way station distance primary, then
+    /// adds the out-and-back distance in brackets. This matches Best Value's
+    /// "extra return travel" basis without changing the actual distance model.
+    func labelWithReturn(unit: DistanceUnit) -> String {
+        "\(label(unit: unit)) (\(unit.format(km * 2)) return)"
+    }
+
     /// VoiceOver form of `label(unit:)`.
     func spokenLabel(unit: DistanceUnit) -> String {
         let text = unit.spoken(km)
         return isApproximate ? "Approximately \(text)" : text
     }
+
+    /// VoiceOver form of `labelWithReturn(unit:)`.
+    func spokenLabelWithReturn(unit: DistanceUnit) -> String {
+        "\(spokenLabel(unit: unit)), \(unit.spoken(km * 2)) return"
+    }
 }
 
 /// Cached Apple-Maps road distances for nearby stations (see