Namespace dropdown closes when navigating with arrow keys in Lens

Application: Lens

Issue: When typing a namespace in the namespace input/search field, using the Up Arrow or Down Arrow keys causes the dropdown/list window to close immediately.

Expected Behavior: After entering text in the namespace field, pressing the arrow keys should allow navigation through the available namespace options in the dropdown list.

Actual Behavior: The dropdown closes instantly when pressing either the Up or Down arrow key, making it impossible to navigate or select items using the keyboard.

Steps to Reproduce:

1. Go to a view with namespace selection
2. Click on the namespace input field
3. Type any namespace or partial namespace name
4. Press Up Arrow or Down Arrow

Result: The dropdown closes immediately instead of moving selection between items.

Impact: Keyboard navigation for namespace selection is currently broken, forcing users to use the mouse for selection.