Auto-expiration for public links

When sharing a page publicly with people outside the instance, it's easy to forget to disable the link afterward, leaving pages exposed longer than intended.

Proposed Solution:

Add an optional expiration duration (e.g., 1 hour, 1 day, 7 days) in the share modal that automatically unpublishes the page when time runs out.

Here is a quick mockup of how it could fit into the current UI:

<img width="684" height="437" alt="image" src=" />

Please let me know your thoughts!