STRICT radius enforcement: never fall back to out-of-radius stations in list, cheapest reference, or widget

FuelBoard/ContentView.swift

@@ -23,15 +23,14 @@ struct ContentView: View {
 
     /// Stations within the CHOSEN search radius (miles) of the current location
     /// — the same pool the list shows, so "cheapest" (RAG, TOP, deltas) matches
-    /// exactly what's on screen. Falls back to the full fetch when location is
-    /// unknown or the radius pool is empty.
+    /// exactly what's on screen. STRICT: no fallback to out-of-radius stations
+    /// (a cached fetch around another location must never leak far results in).
     private var radiusScopedStations: [FuelStation] {
-        guard let location else { return stations }
+        guard let location else { return [] }
         let radiusKM = Double(stationLimit) * 1.60934  // chosen miles → km
-        let within = stations.filter {
+        return stations.filter {
             $0.distanceKM(to: location.lat, lng2: location.lng) <= radiusKM
         }
-        return within.isEmpty ? stations : within
     }
 
     private var cheapestPrice: Double? {
@@ -45,18 +44,17 @@ struct ContentView: View {
     }
 
     private var sortedStations: [FuelStation] {
-        // Stations selling the selected fuel, scoped to the chosen miles radius
-        // from the current location. Local enforcement matters: the cache can
-        // hold stations from a previous, larger radius, and the relay filter
-        // only applies at fetch time.
+        // Stations selling the selected fuel, scoped STRICTLY to the chosen
+        // miles radius from the current location. Local enforcement matters:
+        // the cache can hold stations from a previous, larger radius (or a
+        // different area), and the relay filter only applies at fetch time.
         let selling = stations.filter { $0.prices[selectedFuel] != nil }
         let available: [FuelStation]
         if let location {
             let radiusKM = Double(stationLimit) * 1.60934  // miles → km
-            let within = selling.filter {
+            available = selling.filter {
                 $0.distanceKM(to: location.lat, lng2: location.lng) <= radiusKM
             }
-            available = within.isEmpty ? selling : within
         } else {
             available = selling
         }