Update from code changes: document window.mintlify.user for custom scripts

[mintlify]

Summary

Custom JavaScript files can now read the authenticated user from window.mintlify.user and react to the new mintlify:user event. Documented the API on the custom scripts page and added a cross-link from the personalization page.

Changes

• customize/custom-scripts.mdx: New "Access authenticated user data" subsection under Custom JavaScript covering window.mintlify.user, the mintlify:user event, signed-out behavior, and a security note about the content field.
• create/personalization.mdx: Added a pointer from the MDX user variable section to the new custom scripts guidance.

Triggered by mintlify/mint#9665.

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Note

Low Risk
Documentation-only changes with no runtime or auth logic modifications.

Overview
Documents how custom JavaScript can access the same authenticated user object as MDX’s user variable via window.mintlify.user, and how to react when it becomes available with the mintlify:user event (including signed-out null/undefined behavior and optional chaining).

On custom scripts, adds an “Access authenticated user data” section with event-listener and direct-read examples, plus a warning that anything in user content is visible in the browser. On personalization, adds a short cross-link from dynamic MDX content to that section. The same updates are mirrored in es, fr, and zh locale docs.

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