Favourites: drag-and-drop reorder per fuel; stored order drives single-widget favourite

FuelBoard/ContentView.swift

@@ -159,7 +159,8 @@ struct ContentView: View {
                 selectedFuel: selectedFuel,
                 location: location,
                 distanceUnit: distanceUnit,
-                onToggleFavourite: toggleFavourite
+                onToggleFavourite: toggleFavourite,
+                onReorder: reorderFavourites
             )
             .tabItem { Label("Favourites", systemImage: "star.fill") }
 
@@ -395,6 +396,17 @@ struct ContentView: View {
                        fuel: alertsFuel, radiusKM: effectiveAlertsRadiusKM)
     }
 
+    /// Drag-and-drop reorder from the Favourites tab — persists the new order
+    /// and refreshes every surface that consumes it (widgets + geofence
+    /// priority, which follows the stored order).
+    private func reorderFavourites(_ newOrder: [FavouriteEntry]) {
+        favourites = newOrder
+        FuelStore.saveFavourites(favourites)
+        WidgetCenter.shared.reloadAllTimelines()
+        monitor.update(stations: stations, favourites: refreshedFavourites,
+                       fuel: alertsFuel, radiusKM: effectiveAlertsRadiusKM)
+    }
+
     /// Fetches fresh prices, but only when the cache is stale — unless
     /// `force` is true (pull-to-refresh is the manual override).
     private func refresh(force: Bool = false) async {