Live-test fixes: CarPlay disfavor, widget location refresh, debug cheapest parity

1. CarPlay widget taps could never launch Maps — FuelBoard is not a
   CarPlay app, and Apple only lets a widget launch its own app in
   CarPlay when that app is CarPlay-enabled. Marked the widget as a
   disfavored CarPlay location (iOS 26+; no-op below): read-only in
   the car, no dead tap. Header comment updated to match reality.

2. Widgets now track the user's location: timeline refresh 15m -> 5m,
   and the app's location manager reloads all widget timelines after
   every significant move (250m filter, throttled to 60s), so the
   widget re-orders around the new position while driving instead of
   waiting for the next tick.

3. Debug 'Cheapest in range' no longer shows the ALERT prediction
   (alertsFuel + alert radius — a different pool by design). It now
   mirrors the app list exactly: the TOP-badge station for the
   selected fuel within the stationLimit radius (new DebugAppCheapest
   computed in ContentView, passed to Settings). Alert-prediction
   cheapest kept as fallback when the app view hasn't resolved.

FuelBoard/ContentView.swift

@@ -67,6 +67,24 @@ struct ContentView: View {
         return displayedStations.first { $0.prices[selectedFuel] == baselinePrice }?.id
     }
 
+    /// The app's own "cheapest in range" — the TOP-badge station — mirrored
+    /// into the Settings → Debug section so its "Cheapest in range" row
+    /// matches the app list (and the widget when the widget's fuel + distance
+    /// match the app's). The debug section previously showed the ALERT
+    /// prediction (alertsFuel + alert radius), which is a different pool by
+    /// design — that mismatch is what this fixes.
+    private var appCheapestStatus: DebugAppCheapest? {
+        guard let topID = topStationID,
+              let station = stations.first(where: { $0.id == topID }),
+              let location else { return nil }
+        return DebugAppCheapest(
+            station: station,
+            fuel: selectedFuel,
+            radiusKM: distanceUnit.toKM(Double(stationLimit)),
+            distanceKM: station.distanceKM(to: location.lat, lng2: location.lng)
+        )
+    }
+
     private var displayedStations: [FuelStation] {
         sortedStations
     }
@@ -258,7 +276,8 @@ struct ContentView: View {
             onPlainTestAlert: { monitor.sendPlainTestNotification() },
             onRefreshDebugStatus: { monitor.refreshDebugStatus() },
             onShowOnboarding: { showOnboarding = true },
-            debugStatus: monitor.debugStatus
+            debugStatus: monitor.debugStatus,
+            appCheapest: appCheapestStatus
         )
         .tabItem { Label("Settings", systemImage: "gearshape.fill") }
     }
@@ -494,7 +513,18 @@ final class LocationManager: NSObject, ObservableObject, @preconcurrency CLLocat
     func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
         guard let loc = locations.last else { return }
         current = Coordinate(lat: loc.coordinate.latitude, lng: loc.coordinate.longitude)
+        // Drive the widget: every significant move re-orders the widget list
+        // around the new position immediately, instead of waiting for the
+        // widget's own 5-minute timeline tick. Throttled — WidgetKit ignores
+        // reload spam and the relay has a rate limit, so 60 s is plenty.
+        let now = Date()
+        if now.timeIntervalSince(lastWidgetReload) >= 60 {
+            lastWidgetReload = now
+            WidgetCenter.shared.reloadAllTimelines()
         }
+    }
+
+    private var lastWidgetReload = Date.distantPast
 
     func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
         // Ignore — the app still works price-sorted without location.

FuelBoard/ProximityMonitor.swift

@@ -18,6 +18,18 @@ struct DebugLocationStatus: Equatable {
     var cheapestDistanceKM: Double?
 }
 
+/// App-view cheapest for the Debug section: mirrors EXACTLY what the Stations
+/// list computes (selected fuel, stationLimit radius, current location), so
+/// the debug "Cheapest in range" row matches the TOP badge in the app —
+/// not the alert prediction (which uses alertsFuel + alert radius, a
+/// different pool by design).
+struct DebugAppCheapest: Equatable {
+    let station: FuelStation
+    let fuel: FuelType
+    let radiusKM: Double
+    let distanceKM: Double
+}
+
 /// A station the user wants to see on a map — set when a notification tap
 /// can't hand off to Apple Maps (e.g. inside LiveContainer), so the app shows
 /// an in-app map with directions instead.

FuelBoard/SettingsView.swift

@@ -29,6 +29,9 @@ struct SettingsView: View {
     var onShowOnboarding: () -> Void = {}
     /// Live snapshot of the device fix + stations in range (from the monitor).
     var debugStatus: DebugLocationStatus?
+    /// The app's own TOP-badge cheapest (selected fuel + stationLimit radius),
+    /// so the debug "Cheapest in range" row matches the app list exactly.
+    var appCheapest: DebugAppCheapest?
 
     @StateObject private var tipStore = TipStore()
     @State private var showTipAlert = false
@@ -96,7 +99,7 @@ struct SettingsView: View {
                     } header: {
                         Text("Debug")
                     } footer: {
-                        Text("The first button applies the real criteria — cheapest \(alertsFuel.displayName.lowercased()) station within \(distanceUnit.format(alertsRadiusKM)) of you — and sends the actual station's name, price and coordinates. The second fires with no criteria at all (nearest seller), still carrying a real station, just to verify a notification appears and tapping it opens directions.")
+                        Text("The first button applies the real criteria — cheapest \(alertsFuel.displayName.lowercased()) station within \(distanceUnit.format(alertsRadiusKM)) of you — and sends the actual station's name, price and coordinates. The second fires with no criteria at all (nearest seller), still carrying a real station, just to verify a notification appears and tapping it opens directions. Cheapest in range mirrors the app list (selected fuel + distance); the in-range count mirrors the alert radius.")
                     }
                     .onAppear { onRefreshDebugStatus() }
                 }
@@ -180,8 +183,9 @@ struct SettingsView: View {
     }
 
     /// Debug location block: device coordinates + fix age, then the in-range
-    /// indicator. "In range" mirrors the live alert criteria — stations selling
-    /// the monitored fuel within the alert radius of the last fix.
+    /// indicator. "Cheapest in range" mirrors the app list (selected fuel +
+    /// stationLimit radius) via `appCheapest`; the "In range" count mirrors
+    /// the alert prediction (alert fuel + alert radius).
     @ViewBuilder
     private var debugLocationRows: some View {
         Divider()
@@ -226,7 +230,18 @@ struct SettingsView: View {
                         .foregroundStyle(.secondary)
                 }
             }
-            if let cheapest = status.cheapestInRange {
+            if let cheapest = appCheapest {
+                HStack {
+                    Label("Cheapest in range", systemImage: "fuelpump.fill")
+                    Spacer()
+                    Text(cheapestText(cheapest.station, fuel: cheapest.fuel, distance: cheapest.distanceKM))
+                        .font(.footnote)
+                        .monospacedDigit()
+                        .foregroundStyle(.secondary)
+                }
+            } else if let cheapest = status.cheapestInRange {
+                // Fallback when the app view hasn't resolved yet — show the
+                // alert-prediction cheapest rather than nothing.
                 HStack {
                     Label("Cheapest in range", systemImage: "fuelpump.fill")
                     Spacer()

FuelBoardWidgets/FuelPriceWidget.swift

@@ -5,13 +5,18 @@ import AppIntents
 // FuelBoard widget — petrol stations near you.
 //   systemMedium: top 3-4 stations with price + distance, each row opens Maps
 //   systemSmall:  single station, whole widget opens Maps
-// Taps deep-link to Apple Maps directions (maps://?daddr=). The widget uses
-// the native Maps scheme (not a custom app scheme) so that CarPlay can route
-// the tap straight to Apple Maps — which IS a CarPlay app — without needing
-// the containing app to launch. On the Home Screen the system either opens
-// Maps directly or delivers the URL to FuelBoard, whose onOpenURL forwards it
-// (and also still handles legacy fuelboard:// and http://maps.apple.com links
-// from older cached timelines).
+// Taps deep-link to Apple Maps directions (maps://?daddr=). On the Home
+// Screen the system either opens Maps directly or delivers the URL to
+// FuelBoard, whose onOpenURL forwards it (and also still handles legacy
+// fuelboard:// and http://maps.apple.com links from older cached timelines).
+//
+// CarPlay: this widget is marked as a DISFAVORED location there. Widgets in
+// CarPlay can only launch their OWN app, and only when that app is itself a
+// CarPlay app (fueling entitlement). FuelBoard is not a CarPlay app, so a
+// tap in the car would be a dead interaction — Apple's guidance for widgets
+// whose purpose is launching a non-CarPlay app is to disfavor CarPlay: the
+// widget stays visible (read-only prices) but interaction is disabled, so
+// there is no tap that silently does nothing.
 //
 // Each widget instance is configured INDEPENDENTLY via its own App Intent
 // (long-press → Edit Widget): fuel type (Unleaded/Premium/Diesel) and sort
@@ -30,6 +35,24 @@ struct FuelPriceWidget: Widget {
     let kind = "FuelPriceWidget"
 
     var body: some WidgetConfiguration {
+        // CarPlay: mark as disfavored — FuelBoard is not a CarPlay app, so
+        // widget taps there can never launch Maps (Apple only allows a widget
+        // to launch its own app in CarPlay, and only CarPlay-enabled apps).
+        // Disfavored = read-only in the car, no dead interaction. The
+        // locations array is empty below iOS 26 where `.carPlay` doesn't
+        // exist, making the modifier a harmless no-op there.
+        baseConfiguration()
+            .disfavoredLocations(carPlayLocations, for: [.systemSmall])
+    }
+
+    private var carPlayLocations: [WidgetLocation] {
+        if #available(iOS 26.0, *) {
+            return [.carPlay]
+        }
+        return []
+    }
+
+    private func baseConfiguration() -> some WidgetConfiguration {
         AppIntentConfiguration(
             kind: kind,
             intent: FuelBoardWidgetConfigurationIntent.self,
@@ -79,7 +102,9 @@ struct FuelPriceTimelineProvider: AppIntentTimelineProvider {
         in context: Context
     ) async -> Timeline<FuelPriceEntry> {
         let entry = await makeEntry(configuration: configuration)
-        let nextRefresh = Calendar.current.date(byAdding: .minute, value: 15, to: Date())!
+        // Short cadence so the widget re-orders around a new location while
+        // driving — the provider re-fetches a fresh fix + prices each tick.
+        let nextRefresh = Calendar.current.date(byAdding: .minute, value: 5, to: Date())!
         return Timeline(entries: [entry], policy: .after(nextRefresh))
     }