Large icon+title header at rest; compact gas-pump bar appears only after scrolling (tracker on header row background)

FuelBoard/StationsView.swift

@@ -22,10 +22,37 @@ struct StationsView: View {
     /// which station is "best".
     @State private var pageSize = 10
     @State private var visibleCount = 10
+    /// True once the list has scrolled — the large header title is shown at
+    /// rest; the compact gas-pump+title bar appears only after scrolling.
+    @State private var isScrolled = false
 
     var body: some View {
         NavigationStack {
             List {
+                // Large title header (icon + title). Native navigation titles
+                // can't carry an icon, so this is a real row; the scroll
+                // tracker rides on its background so no extra row is created.
+                HStack(spacing: 10) {
+                    Image(systemName: "fuelpump.fill")
+                        .font(.system(size: 34))
+                        .foregroundStyle(selectedFuel.tintColor)
+                    Text("FuelBoard")
+                        .font(.largeTitle.bold())
+                }
+                .frame(maxWidth: .infinity, alignment: .leading)
+                .padding(.vertical, 6)
+                .listRowSeparator(.hidden)
+                .listRowInsets(EdgeInsets(top: 0, leading: 16, bottom: 0, trailing: 16))
+                .listRowBackground(Color.clear)
+                .background(
+                    GeometryReader { proxy in
+                        Color.clear.preference(
+                            key: ScrollOffsetKey.self,
+                            value: proxy.frame(in: .named("stationsScroll")).minY
+                        )
+                    }
+                )
+
                 Section {
                     if let location {
                         if sortMode == .closest {
@@ -180,24 +207,40 @@ struct StationsView: View {
                 // New fetch or filter switch → back to the first page.
                 visibleCount = pageSize
             }
+            .coordinateSpace(name: "stationsScroll")
+            .onPreferenceChange(ScrollOffsetKey.self) { minY in
+                isScrolled = minY < -60
+            }
             .toolbar {
                 ToolbarItem(placement: .principal) {
+                    if isScrolled {
                         HStack(spacing: 6) {
                             Image(systemName: "fuelpump.fill")
                                 .foregroundStyle(selectedFuel.tintColor)
                             Text("FuelBoard")
                                 .font(.headline)
                         }
+                        .transition(.opacity)
+                    }
                 }
             }
             .navigationBarTitleDisplayMode(.inline)
-            .navigationTitle("FuelBoard")
         }
     }
 }
 
 // MARK: - Fuel-type iconography (app target only — FuelStore.swift is Foundation-only)
 
+/// Scroll offset preference — the large-title header row reports its position
+/// in the list's coordinate space so we know when it has scrolled under the
+/// nav bar (minY < -60) and can show the compact gas-pump+title bar.
+private struct ScrollOffsetKey: PreferenceKey {
+    static var defaultValue: CGFloat = 0
+    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
+        value = nextValue()
+    }
+}
+
 extension FuelType {
     /// Short segment label ("Unleaded" / "Premium" / "Diesel") for the picker.
     var shortName: String {