`Buy Proxyman Pro` Menu Bar Button Does Nothing if All Proxyman Windows Have Been Closed (but app still runs)

Description

Proxyman is a very well designed macOS app. I've been referencing it as I'm improving my macOS app (https://lyrcs.app). I wanted to mimic Proxyman's pattern of showing the PRO window when user presses Menu > Proxyman > Buy Proxyman Pro.... I discovered however nothing appears if no window is available which is because Proxyman presents a modal sheet over a window. I expect this to be a minor case because how often would a user use Proxyman without a window open. Regardless I thought it would be interesting to see how you solved it as perhaps I could solve it in a similar way.

Steps to Reproduce

1. Open Proxyman
2. Close window (CMD + W)
3. Menu > Proxyman > Buy Proxyman Pro...

Current Behavior

Nothing occurs

Expected Behavior

I receive information about Proxyman Pro.

Environment

• App version: Version 5.2.0 (50200)
• macOS version: 14.4.1 (23E224)

Possible Solutions

• Use focusedSceneValue to only enable the button if a window is active.
  • If disabled, could add "(Open a window)" to the button text so user knows how to enable the button
• Show an alert advising user to open a window and try again
• Open the proxyman window followed by opening the modal

Reproduce the issue by opening Proxyman, closing its window with Cmd+W, and selecting Menu > Proxyman > Buy Proxyman Pro.... Investigate the menu action and modal presentation path for the no-window state. Done means the action provides Proxyman Pro information when all windows are closed, using one of the behaviors described in Possible Solutions.