[Feature Request] Plan mode should not auto-dismiss explanation while user is reading | Zed on Mac

<img width="1370" height="944" alt="Image" src="https://github.com/user-attachments/assets/bee37eb0-aaa1-410e-9e82-226b6af2a7b6" />

Bug Description
[Image #64] In plan mode, I was reading an explanation and it popped the implementation plan over the explation. I like reading the thinking as it provides context.

Environment Info

• Platform: darwin
• Terminal: zed
• Version: 2.1.181
• Feedback ID: eb1272b5-457e-4802-9bd3-0df2b5947f73

Errors

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