gpui: Add a Popover example for test deferred (#44473)
Release Notes:
- N/A
<img width="1036" height="659" alt="image"
src="https://github.com/user-attachments/assets/8ca06306-719f-4495-92b3-2a609aa09249"
/>
5fb220a19aJason Lee committed on 12/20/2025, 12:27:41 AM· committed by GitHubparent12dbbdd