Results filter is now search radius in miles (5/10/15); relay fetch scoped to radius, limit 500; changing miles re-fetches; caption shows stations within N miles

FuelBoard/ContentView.swift

@@ -39,7 +39,9 @@ struct ContentView: View {
     }
 
     private var displayedStations: [FuelStation] {
-        Array(sortedStations.prefix(stationLimit))
+        // Relay already returns every station within the selected miles radius
+        // (sorted nearest-first); no local cap needed.
+        sortedStations
     }
 
     private var sortedStations: [FuelStation] {
@@ -145,6 +147,10 @@ struct ContentView: View {
             // No re-fetch needed — one response carries E5/E10/DIESEL prices.
             WidgetCenter.shared.reloadAllTimelines()
         }
+        .onChange(of: stationLimit) { _, _ in
+            // Search radius changed (miles) — cached stations may not cover it.
+            Task { await refresh(force: true) }
+        }
         .onChange(of: alertsEnabled) { _, newValue in
             FuelStore.saveAlertsEnabled(newValue)
             monitor.setEnabled(newValue)
@@ -182,7 +188,11 @@ struct ContentView: View {
         isLoading = true
         defer { isLoading = false }
         do {
-            let fetched = try await FuelPriceProvider.active.fetchStations(near: location?.lat, lng: location?.lng, fuel: selectedFuel)
+            let fetched = try await FuelPriceProvider.active.fetchStations(
+                near: location?.lat, lng: location?.lng,
+                fuel: selectedFuel,
+                radiusKM: Double(stationLimit) * 1.60934  // miles → km
+            )
             stations = fetched
             FuelStore.saveStations(fetched)
             FuelStore.saveLastRefresh()