Saves the recent navigation history (up to 20 entries) to the workspace
DB so it survives restarts. When reopening a workspace, persisted paths
that resolve to the current project are merged into the file finder's
history, deduplicated against files already opened in the session.


https://github.com/user-attachments/assets/3d8934e1-0da6-4445-8f3d-acc5597d7ac8

Self-Review Checklist:

- [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

Closes: https://github.com/zed-industries/zed/issues/56271

Release Notes:

- Improved file finder history to include recently opened files from
previous sessions.