Settings: Fuel Savings moves to the first section

It was the third block in the List (after Units and Tap action), so the feature's
own controls — and the MPG/fill-up figures that drive the Best Value ranking —
sat below unrelated settings. The section (header, toggle, sliders, footer) is now
the first thing in the List; Units and Tap action follow in their existing order,
unchanged.

The move is a pure reorder: no copy, no binding, no gating changed. The section
still greys its controls out when Best Value is switched off, and the footer
narrative is unchanged.

Verified on the simulator: Settings opens with Fuel Savings -> Best Value ->
Average fuel economy / 45 MPG, with Units and Tap action below.

FuelBoard/SettingsView.swift

@@ -104,51 +104,6 @@ struct SettingsView: View {
     var body: some View {
         NavigationStack {
             List {
-                Section {
-                    Picker("Distance", selection: $distanceUnit) {
-                        ForEach(DistanceUnit.allCases) { unit in
-                            Text(unit.displayName).tag(unit)
-                        }
-                    }
-                    .pickerStyle(.segmented)
-                    .onChange(of: distanceUnit) { _, newValue in
-                        FuelStore.saveDistanceUnit(newValue)
-                        WidgetCenter.shared.reloadAllTimelines()
-                        WatchSyncManager.shared.pushSnapshot()
-                    }
-                    Picker("Price display", selection: $priceDisplayStyle) {
-                        ForEach(PriceDisplayStyle.allCases) { style in
-                            Text(style.displayName).tag(style)
-                        }
-                    }
-                    .pickerStyle(.segmented)
-                    .onChange(of: priceDisplayStyle) { _, newValue in
-                        FuelStore.savePriceDisplayStyle(newValue)
-                        WidgetCenter.shared.reloadAllTimelines()
-                        WatchSyncManager.shared.pushSnapshot()
-                    }
-                } header: {
-                    Text("Units")
-                } footer: {
-                    Text("Distances and search radii across the app, widget and alerts are shown in this unit. Prices can be shown as on a station sign (129.9) or in pounds and pence (£1.29⁹/L).")
-                }
-
-                Section {
-                    Picker("Tap station", selection: $stationTapAction) {
-                        ForEach(StationTapAction.allCases) { action in
-                            Text(action.displayName).tag(action)
-                        }
-                    }
-                    .pickerStyle(.segmented)
-                    .onChange(of: stationTapAction) { _, newValue in
-                        FuelStore.saveStationTapAction(newValue)
-                    }
-                } header: {
-                    Text("Tap action")
-                } footer: {
-                    Text("Tapping a station either opens directions straight away or shows its details first.")
-                }
-
                 Section {
                     Toggle("Best Value", isOn: fuelSavingsEnabledBinding)
                     // The feature's own controls follow its toggle: switched
@@ -202,6 +157,51 @@ struct SettingsView: View {
                     Text("Best Value estimates fuel cost only, using UK imperial MPG, your typical purchase amount, fuel prices and Apple Maps road distances. Real-world average MPG is better than manufacturer figures; the fill-up amount is your usual purchase, not tank capacity.")
                 }
 
+                Section {
+                    Picker("Distance", selection: $distanceUnit) {
+                        ForEach(DistanceUnit.allCases) { unit in
+                            Text(unit.displayName).tag(unit)
+                        }
+                    }
+                    .pickerStyle(.segmented)
+                    .onChange(of: distanceUnit) { _, newValue in
+                        FuelStore.saveDistanceUnit(newValue)
+                        WidgetCenter.shared.reloadAllTimelines()
+                        WatchSyncManager.shared.pushSnapshot()
+                    }
+                    Picker("Price display", selection: $priceDisplayStyle) {
+                        ForEach(PriceDisplayStyle.allCases) { style in
+                            Text(style.displayName).tag(style)
+                        }
+                    }
+                    .pickerStyle(.segmented)
+                    .onChange(of: priceDisplayStyle) { _, newValue in
+                        FuelStore.savePriceDisplayStyle(newValue)
+                        WidgetCenter.shared.reloadAllTimelines()
+                        WatchSyncManager.shared.pushSnapshot()
+                    }
+                } header: {
+                    Text("Units")
+                } footer: {
+                    Text("Distances and search radii across the app, widget and alerts are shown in this unit. Prices can be shown as on a station sign (129.9) or in pounds and pence (£1.29⁹/L).")
+                }
+
+                Section {
+                    Picker("Tap station", selection: $stationTapAction) {
+                        ForEach(StationTapAction.allCases) { action in
+                            Text(action.displayName).tag(action)
+                        }
+                    }
+                    .pickerStyle(.segmented)
+                    .onChange(of: stationTapAction) { _, newValue in
+                        FuelStore.saveStationTapAction(newValue)
+                    }
+                } header: {
+                    Text("Tap action")
+                } footer: {
+                    Text("Tapping a station either opens directions straight away or shows its details first.")
+                }
+
                 Section {
                     Picker("Data checking", selection: $dataRefreshMode) {
                         ForEach(DataRefreshMode.allCases) { mode in