fix: query tracking state on startup to sync with service

lib/main_screen.dart

@@ -23,7 +23,32 @@ class _MainScreenState extends State<MainScreen> {
     _initLocationStream();
   }
 
-  void _initLocationStream() {
+  Future<void> _initLocationStream() async {
+    final status = await LocationBridge.getStatus();
+    if (mounted) {
+      setState(() {
+        _isTracking = status?['isTracking'] == true;
+        final lat = status?['lastLatitude'];
+        final lon = status?['lastLongitude'];
+        if (lat != null && lat != 0.0) {
+          _lastLat = lat.toStringAsFixed(4);
+        }
+        if (lon != null && lon != 0.0) {
+          _lastLon = lon.toStringAsFixed(4);
+        }
+        final speed = status?['lastSpeed'];
+        if (speed != null) {
+          _lastSpeed = '${(speed * 3.6).toStringAsFixed(0)} km/h';
+        }
+        final timestamp = status?['lastTimestamp'];
+        if (timestamp != null) {
+          _lastTime = _formatTime(
+            DateTime.fromMillisecondsSinceEpoch(timestamp),
+          );
+        }
+      });
+    }
+
     LocationBridge.locationUpdates.listen((location) {
       if (mounted) {
         setState(() {
@@ -52,10 +77,14 @@ class _MainScreenState extends State<MainScreen> {
     } else {
       await LocationBridge.startTracking();
     }
+    await Future.delayed(const Duration(milliseconds: 500));
+    final status = await LocationBridge.getStatus();
+    if (mounted) {
       setState(() {
-      _isTracking = !_isTracking;
+        _isTracking = status?['isTracking'] == true;
       });
     }
+  }
 
   @override
   Widget build(BuildContext context) {