## Context

This PR adds a function to sync up the title bar state if a workspace is
moved to a new window through the threads sidebar. This is needed
because otherwise the padding for the traffic control buttons on macOS
wasn't being taken into consideration.

## How to Review

- Move a project to a new window from the sidebar 
- See that the title bar for that new window looks normal, as it should

---

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Release Notes:

- N/A