Closes #49336

Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [ ] Aligned any UI changes with the [UI

checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

### Video:

https://drive.google.com/file/d/1qAwAoDr4wr8cs1dosvLocU-a4pngJZvr/view?usp=sharing

Release Notes:

- Fixed agent panel stealing keyboard focus from modals during workspace
restoration