fix(docking): address code quality issues in Docking system

src/Editor/Ghost.Editor/View/Controls/Docking/DockContainer.cs

@@ -53,14 +53,7 @@ public abstract class DockContainer : DockModule
         if (_children.Contains(module))
             return;
 
-        if (module.Owner == this)
-        {
-            RemoveChildInternal(module, false);
-        }
-        else
-        {
-            module.Owner?.RemoveChild(module);
-        }
+        module.Owner?.RemoveChild(module);
 
         module.Owner = this;
         module.Root = Root;

src/Editor/Ghost.Editor/View/Controls/Docking/DockPanel.cs

@@ -63,6 +63,7 @@ public class DockPanel : DockContainer
             {
                 if (child is DockPanel childPanel)
                 {
+                    RemoveChildInternal(childPanel, false);
                     Root.RootPanel = childPanel;
                 }
             }

src/Editor/Ghost.Editor/View/Controls/Docking/DockingLayout.cs

@@ -59,6 +59,11 @@ public class DockingLayout : Control
                     throw new InvalidOperationException("Panel is already owned by another DockingLayout");
                 }
 
+                if (newPanel.Owner != null)
+                {
+                    newPanel.Owner.RemoveChild(newPanel);
+                }
+
                 newPanel.Root = layout;
             }
         }