added accuracy and distance traveled

lib/screens/excursion/widgets/tracking.dart

@@ -25,6 +25,8 @@ class _TrackingState extends State<Tracking> {
   LocationMarkerPosition? locationMarkerPosition;
   MapController mapController = MapController();
   StreamSubscription? _positionSubscription;
+  StreamSubscription? _statsSubscription;
+  TrackingStats? _currentStats;
 
   @override
   void initState() {
@@ -52,6 +54,12 @@ class _TrackingState extends State<Tracking> {
       accuracy: widget.startPosition.accuracy,
     );
 
+    // Initialisiere die Statistiken sofort
+    setState(() {
+      _currentStats = _trackingService.currentStats;
+    });
+    _trackingService.requestStatsUpdate();
+
     _positionSubscription = _trackingService.positionStream$.listen((position) {
       setState(() {
         locationMarkerPosition = LocationMarkerPosition(
@@ -62,6 +70,12 @@ class _TrackingState extends State<Tracking> {
       });
     });
 
+    _statsSubscription = _trackingService.statsStream$.listen((stats) {
+      setState(() {
+        _currentStats = stats;
+      });
+    });
+
     GeolocatorService.alwaysPositionEnabled().then((value) {
       if (!value && mounted) {
         Navigator.of(context).pop();
@@ -73,15 +87,45 @@ class _TrackingState extends State<Tracking> {
   @override
   void dispose() {
     _positionSubscription?.cancel();
+    _statsSubscription?.cancel();
     widget.weg.text = _trackingService.getPathAsString();
     super.dispose();
   }
 
+  String _formatDistance(double meters) {
+    if (meters >= 1000) {
+      return '${(meters / 1000).toStringAsFixed(2)} km';
+    }
+    return '${meters.toStringAsFixed(1)} m';
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text(AppLocalizations.of(context)!.tracking),
+        title: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(AppLocalizations.of(context)!.tracking),
+            if (_currentStats != null)
+              DefaultTextStyle(
+                style: Theme.of(context).textTheme.bodySmall!,
+                child: Row(
+                  children: [
+                    Expanded(
+                      child: Text(
+                        '${AppLocalizations.of(context)!.accuracy}: ${_currentStats!.currentAccuracy.toStringAsFixed(1)}m (∅ ${_currentStats!.averageAccuracy.toStringAsFixed(1)}m)',
+                        overflow: TextOverflow.ellipsis,
+                      ),
+                    ),
+                    Text(
+                      _formatDistance(_currentStats!.totalDistanceMeters),
+                    ),
+                  ],
+                ),
+              ),
+          ],
+        ),
         leading: IconButton(
           onPressed: () {
             Navigator.pop(context);