UI Overlap: Permission dropdown menu persists and obstructs "Allow" / "Deny" buttons in AI Assistant window

Steps to reproduce:

1. Create a Unity project
2. Select "Light" Unity theme
3. Click the "AI" button
4. Click "Agree and install Unity AI"
5. Wait until the installation is complete
6. Perform an action that would cause a warning or error in the console window, or execute steps in this issue [Internal link] 
7. Go to the "Console" window and select a warning message
8. Click "Add to Assistant", which is displayed next to the "Editor" dropdown
9. Add a prompt "How to fix the issue?" and click "Send Prompt"
10. Wait while the "Execute code" button will appear
11. Click the first one "Just once"
12. Observe the result

Actual results: The dropdown menu remains open and stuck in a "hover" or "active" state. It visually overlaps the action buttons.

Expected results: No overlapping. All the buttons should be displayed tidily and access to all should be available always.

Reproducible with versions:  2.5.0-pre.2

Tested on (OS): macOS - Tahoe 26.4