fix: resolve map view initialization timing issue (#504)

Author: jokerttu

ios/react-native-navigation-sdk/NavViewController.m

@@ -79,7 +79,12 @@ - (void)loadView {
 - (void)viewDidLoad {
   [super viewDidLoad];
 
-  [_viewCallbacks handleMapReady];
+  // Defer to next run loop to ensure view props are set before calling onMapReady
+  dispatch_async(dispatch_get_main_queue(), ^{
+    if (self->_viewCallbacks) {
+      [self->_viewCallbacks handleMapReady];
+    }
+  });
 }
 
 - (void)viewDidLayoutSubviews {