Closest mode: TOP + deltas vs the CHEAPEST within radius (not the nearest); list stays nearest-first

FuelBoard/ContentView.swift

@@ -36,15 +36,32 @@ struct ContentView: View {
         }
     }
 
-    /// The price reference every row's delta + RAG compares against.
-    /// Cheapest mode → the cheapest station in the pool (best value).
-    /// Closest mode → the CLOSEST station: deltas answer "is it worth leaving
-    /// the station nearest to me?" (+X.Xp pricier / -X.Xp cheaper).
+    /// The price reference every row's delta + RAG compares against — the
+    /// "best" of the current pool. In BOTH modes that is the CHEAPEST station
+    /// within the chosen miles radius (the stations you'd actually consider).
+    /// Cheapest mode's pool already is the radius; Closest mode lists the
+    /// whole country nearest-first (so it never empties), but best value is
+    /// still judged against what's practically reachable, so deltas stay local.
+    /// Fallback: if the radius has no stations, use the pool minimum.
     private var baselinePrice: Double? {
-        if sortMode == .closest {
-            return sortedStations.first?.prices[selectedFuel]
+        let pool = poolStations
+        if sortMode == .closest, let location {
+            let radiusKM = Double(stationLimit) * 1.60934  // chosen miles → km
+            let within = pool.filter {
+                $0.distanceKM(to: location.lat, lng2: location.lng) <= radiusKM
+            }
+            if let localMin = within.compactMap({ $0.prices[selectedFuel] }).min() {
+                return localMin
+            }
         }
-        return poolStations.compactMap { $0.prices[selectedFuel] }.min()
+        return pool.compactMap { $0.prices[selectedFuel] }.min()
+    }
+
+    /// The "best" station — the cheapest in the pool — gets the TOP badge.
+    /// First occurrence in display order wins on price ties.
+    private var topStationID: String? {
+        guard let baselinePrice else { return nil }
+        return displayedStations.first { $0.prices[selectedFuel] == baselinePrice }?.id
     }
 
     private var displayedStations: [FuelStation] {
@@ -94,6 +111,7 @@ struct ContentView: View {
                 sortMode: $sortMode,
                 stationLimit: $stationLimit,
                 baselinePrice: baselinePrice,
+                topStationID: topStationID,
                 location: location,
                 favouriteIDs: favouriteIDs,
                 onToggleFavourite: toggleFavourite,