Simplify shared fill-up wording and help

FuelBoard/FavouritesView.swift

@@ -69,6 +69,15 @@ struct FavouritesView: View {
     }
     private var cheapestPrice: Double? { cheapest?.prices[activeFuel] }
 
+    /// The baseline note is useful only when at least one visible favourite has
+    /// an actual savings comparison. An unavailable result (for example, while
+    /// location is missing) must not leave an orphaned explanation below the list.
+    private var showsSavingsComparisonExplanation: Bool {
+        fuelSavingsSettings.isConfigured && ordered.contains { station in
+            savingsForStation(station)?.result != nil
+        }
+    }
+
     /// IDs favourited for the active fuel — the star state on each row.
     private var activeFuelFavouriteIDs: Set<String> {
         Set(favourites.filter { $0.fuel == activeFuel }.map(\.station.id))
@@ -145,8 +154,6 @@ struct FavouritesView: View {
                     if fuelSavingsSettings.isConfigured {
                         Section {
                             FuelSavingsAdjustmentView(amount: $fuelSavingsAmount)
-                        } footer: {
-                            Text(String(localized: "Savings below are estimated against the closest station by journey distance — the same baseline as the Stations list.", comment: "Favourites fuel-savings explanation"))
                         }
                     }
 
@@ -171,7 +178,15 @@ struct FavouritesView: View {
                     } header: {
                         Text(String(format: String(localized: "%@ favourites", comment: "Favourites section title for fuel type"), activeFuel.displayName))
                     } footer: {
-                        Text(String(localized: "The first station is the favourite used in single widgets. Tap Edit, then drag to reorder.", comment: "Favourites reorder explanation"))
+                        VStack(alignment: .leading, spacing: 12) {
+                            Text(String(localized: "The first station is the favourite used in single widgets. Tap Edit, then drag to reorder.", comment: "Favourites reorder explanation"))
+                            if showsSavingsComparisonExplanation {
+                                Text(String(localized: "Savings are compared with your nearest station, just like in the Stations tab.", comment: "Favourites fuel-savings explanation"))
+                            }
+                        }
+                        .font(.footnote)
+                        .foregroundStyle(.secondary)
+                        .frame(maxWidth: .infinity, alignment: .leading)
                     }
 
                     if let cheapest = cheapest {