chore: improve error handling during widget disposal on example app

Author: jokerttu

example/lib/pages/camera.dart

@@ -119,7 +119,11 @@ class _CameraPageState extends ExamplePageState<CameraPage> {
   @override
   void dispose() {
     if (_navigationRunning) {
-      GoogleMapsNavigator.cleanup();
+      GoogleMapsNavigator.cleanup().catchError((e) {
+        if (e is! SessionNotInitializedException) {
+          debugPrint('Navigator cleanup error: $e');
+        }
+      });
     }
     super.dispose();
   }

example/lib/pages/multiple_views.dart

@@ -82,7 +82,11 @@ class _MultiplexState extends ExamplePageState<MultipleMapViewsPage> {
 
   @override
   void dispose() {
-    GoogleMapsNavigator.cleanup();
+    GoogleMapsNavigator.cleanup().catchError((e) {
+      if (e is! SessionNotInitializedException) {
+        debugPrint('Navigator cleanup error: $e');
+      }
+    });
     clearRegisteredImages();
     super.dispose();
   }

example/lib/pages/navigation.dart

@@ -170,7 +170,11 @@ class _NavigationPageState extends ExamplePageState<NavigationPage> {
   @override
   void dispose() {
     _clearListeners();
-    GoogleMapsNavigator.cleanup();
+    GoogleMapsNavigator.cleanup().catchError((e) {
+      if (e is! SessionNotInitializedException) {
+        debugPrint('Navigator cleanup error: $e');
+      }
+    });
     clearRegisteredImages();
     super.dispose();
   }
@@ -623,7 +627,11 @@ class _NavigationPageState extends ExamplePageState<NavigationPage> {
 
     // Cleanup navigation session.
     // This will also clear destinations, stop simulation, stop guidance
-    await GoogleMapsNavigator.cleanup();
+    await GoogleMapsNavigator.cleanup().catchError((e) {
+      if (e is! SessionNotInitializedException) {
+        debugPrint('Navigator cleanup error: $e');
+      }
+    });
     await _removeNewWaypointMarker();
     await _removeDestinationWaypointMarkers();
     _waypoints.clear();

example/lib/pages/navigation_without_map.dart

@@ -110,7 +110,11 @@ class _NavigationWithoutMapPageState
   }
 
   Future<void> cleanupNavigationSession() async {
-    await GoogleMapsNavigator.cleanup();
+    GoogleMapsNavigator.cleanup().catchError((e) {
+      if (e is! SessionNotInitializedException) {
+        debugPrint('Navigator cleanup error: $e');
+      }
+    });
     setState(() {
       routeCalculated = false;
       guidanceRunning = false;

example/lib/pages/turn_by_turn.dart

@@ -130,7 +130,11 @@ class _TurnByTurnPageState extends ExamplePageState<TurnByTurnPage> {
   void dispose() {
     _clearListeners();
     if (_navigationRunning) {
-      GoogleMapsNavigator.cleanup();
+      GoogleMapsNavigator.cleanup().catchError((e) {
+        if (e is! SessionNotInitializedException) {
+          debugPrint('Navigator cleanup error: $e');
+        }
+      });
     }
     super.dispose();
   }

example/lib/pages/widget_initialization.dart

@@ -70,7 +70,11 @@ class _ViewInitializationPageState
   @override
   void dispose() {
     if (_navigationInitialized) {
-      GoogleMapsNavigator.cleanup();
+      GoogleMapsNavigator.cleanup().catchError((e) {
+        if (e is! SessionNotInitializedException) {
+          debugPrint('Navigator cleanup error: $e');
+        }
+      });
     }
     super.dispose();
   }