Favourites tab: remove the crown 'cheapest favourite' banner

The gold-crown header row is redundant with the list itself (rows are already
cheapest-first with a TOP badge on the first). The bottom caption about
alerts monitoring stays.

FuelBoard/FavouritesView.swift

@@ -92,17 +92,6 @@ struct FavouritesView: View {
                         .pickerStyle(.segmented)
                     }
 
-                    Section {
-                        if let cheapest, let price = cheapestPrice {
-                            HStack(spacing: 10) {
-                                Image(systemName: "crown.fill")
-                                    .foregroundStyle(.yellow)
-                                Text("Cheapest \(activeFuel.displayName) favourite: \(cheapest.name) — \(String(format: "%.1fp", price))")
-                                    .font(.footnote)
-                            }
-                        }
-                    }
-
                     Section("\(activeFuel.displayName) favourites — cheapest first") {
                         ForEach(Array(ranked.enumerated()), id: \.element.id) { index, station in
                             StationRow(