fix(dock): complete tear-off flow and add rollback on failure

src/Editor/Ghost.Editor/View/Controls/TabTornOffEventArgs.cs

@@ -0,0 +1,17 @@
+namespace Ghost.Editor.View.Controls;
+
+/// <summary>
+/// Event arguments for the TabTornOff event.
+/// </summary>
+public sealed class TabTornOffEventArgs : EventArgs
+{
+    /// <summary>
+    /// Gets the content of the tab being torn off.
+    /// </summary>
+    public object TabContent { get; }
+
+    public TabTornOffEventArgs(object tabContent)
+    {
+        TabContent = tabContent;
+    }
+}