fix(UX): path replacement after save

[perber]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes a UX issue with path replacement after saving a page in the editor. The change ensures that paths are correctly constructed by handling cases where the parent path may already contain a leading slash, preventing double slashes in the final URL.

• Prevents double slashes in constructed paths by conditionally removing leading slashes from parent paths
• Replaces direct string concatenation with conditional logic for more robust path construction

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}