Automatically Focus the Command Prompt When Showing Substage

When Substage is shown via the Show/Hide hotkey, the initial focus currently lands on the window control to close Substage again, instead of the command prompt.

As a result, I often have to press Tab before I can start typing.

It would be much more efficient if showing Substage automatically focused the command prompt and placed the text cursor inside the input field so users can immediately start typing without any additional keyboard navigation.

This would improve both usability and keyboard accessibility.