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/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()