add viewInsets listener

packages/zefyr/lib/src/widgets/editor.dart

     super.initState();
     _imageDelegate = widget.imageDelegate;
     _linkDelegate = widget.linkDelegate;
+    WidgetsBinding.instance.addPostFrameCallback((Duration duration) {
+      if (MediaQuery.of(context).viewInsets.bottom == 0) {
+        if (!_scope.keepOverlay) {
+          _scope.toolbarAction = null;
+          hideToolbar();
+        }
+      }
+    });
   }
 
   @override