Settings search treated multi-word queries as OR, so “tab size” matched
any document whose words contained a prefix of “tab” or “size” --
flooding results with unrelated entries like “Show Tab Bar” and “Maximum
Tabs”.

Self-Review Checklist:

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

Closes #56244.

Release Notes:

- Fixed settings UI search returning unrelated results for multi-word
queries