The Skill page now renders the correct “Skill Tool” title, the
skill-specific explanation, and reads/writes the `skill` tool’s own
rules.

## Self-Review Checklist:

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

## Showcase

| Before | After |
|--------|--------|
| <img width="956" height="816" alt="image"
src="https://github.com/user-attachments/assets/e88ef051-aa5c-46de-9843-e3400fd63a7f"
/> | <img width="956" height="816" alt="image"
src="https://github.com/user-attachments/assets/77b8223d-bd97-4ac2-901d-15cf368341ec"
/> |

Closes #59720.

---

Release Notes:

- Fixed the Skill tool’s “Configure” button in the Agent’s Tool
Permissions settings opening the Terminal tool’s configuration instead
of the Skill tool’s own permission rules