Fix: Clear search text on load with ApplicationIdle priority

Refined the solution to handle Revit keyboard shortcut bleed-through by clearing `tbxSearch.Text` directly in the window's `Loaded` event with `DispatcherPriority.ApplicationIdle`. This ensures the clearing happens after all pending input events are processed by Revit, effectively removing the errant characters while maintaining the default search bar focus as requested by the maintainer.

Fixes #76

Co-authored-by: chuongmep <31106432+chuongmep@users.noreply.github.com>

Author: google-labs-jules[bot]

AddInManager/View/FrmAddInManager.xaml.cs

@@ -31,8 +31,8 @@ private void FrmAddInManager_OnLoaded(object sender, RoutedEventArgs e)
         // We clear the search text after the window is fully loaded and idle.
         Dispatcher.BeginInvoke(new Action(() =>
         {
-            viewModel.SearchText = string.Empty;
-        }), DispatcherPriority.ContextIdle);
+            tbxSearch.Text = string.Empty;
+        }), DispatcherPriority.ApplicationIdle);
     }
 
     private void TbxDescription_OnLostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)