Background location tracking

lib/utils/location_permission.dart

@@ -27,6 +27,39 @@ Future<bool> ensureLocationPermission() async {
     final newStatus = await requestLocationPermission();
     return newStatus.isGranted;
   }
-  // permanently denied – user must open settings
+  // permanently denied – send user to settings so they can enable it
+  await openAppSettings();
+  return false;
+}
+
+/// Ensures "Allow all the time" (background) location permission is granted.
+///
+/// This is required for `background_locator_2` to track location when the app
+/// is backgrounded or killed. On Android 10+ this triggers the system prompt
+/// for `ACCESS_BACKGROUND_LOCATION`. Must be called **after** the foreground
+/// location permission (`Permission.location`) has been granted.
+Future<bool> ensureBackgroundLocationPermission() async {
+  if (kIsWeb) return true;
+
+  // Foreground location must be granted first; this helper already opens
+  // settings if the user permanently denied the fine/coarse prompt.
+  final fgGranted = await ensureLocationPermission();
+  if (!fgGranted) return false;
+
+  final bgStatus = await Permission.locationAlways.status;
+  if (bgStatus.isGranted) return true;
+
+  if (bgStatus.isDenied || bgStatus.isRestricted || bgStatus.isLimited) {
+    final newStatus = await Permission.locationAlways.request();
+    if (newStatus.isGranted) return true;
+    if (newStatus.isPermanentlyDenied) {
+      // user chose "Don't ask again" – send them to settings
+      await openAppSettings();
+    }
+    return false;
+  }
+
+  // Permanently denied – user must open settings
+  await openAppSettings();
   return false;
 }