fix(ui): remove unnecessary IntPtr conversion for HWnd

dte.MainWindow.HWnd already returns IntPtr on x64, so wrapping it
in new IntPtr() causes a compilation error. Use the value directly.

Author: CalvinAllen

src/CodingWithCalvin.ProjectRenamifier/Commands/RenamifyProjectCommand.cs

@@ -67,10 +67,9 @@ private void RenameProject(Project project, DTE2 dte)
             var dialog = new RenameProjectDialog(currentName);
 
             // Set the owner to the VS main window for proper modal behavior
-            var hwnd = new IntPtr(dte.MainWindow.HWnd);
             var helper = new WindowInteropHelper(dialog)
             {
-                Owner = hwnd
+                Owner = dte.MainWindow.HWnd
             };
 
             if (dialog.ShowDialog() != true)