Having multiple remote hosts with long project names makes the project
picker tricky to use.

Added the remote hostname to the tooltip to avoid guessing.

**truncated project + hostname (no change)**
<img width="426" height="368" alt="Screenshot 2026-03-15 at 12 16 29 PM"
src="https://github.com/user-attachments/assets/7b6b732e-cf3c-42c7-9912-1a69ee58b60e"
/>


**hostname in tooltip (multiline)**
<img width="495" height="366" alt="Screenshot 2026-03-15 at 12 16 56 PM"
src="https://github.com/user-attachments/assets/77b60b3a-b8c0-4088-b3c2-3c105a097720"
/>

**hostname in tooltip (single line)**
<img width="426" height="366" alt="Screenshot 2026-03-15 at 12 17 15 PM"
src="https://github.com/user-attachments/assets/baf4d4bd-2724-4a3e-ab29-39ff714fec0e"
/>


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
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- Add remote hostname to title bar project picker tooltip.

Co-authored-by: Amp <amp@ampcode.com>