Hidden libraries still expose section headers such as in "Recently Added in ____"

[nothing2obvi]

Description:

When creating a "Recently Added in ____" section using a library’s ParentId, if a user does not have access to that library, the section header still appears without any media beneath it.

Impact:

This may unintentionally reveal the existence and names of restricted libraries, creating a potential privacy concern for administrators.

Steps to Reproduce:

1. Create a "Recently Added in ____" section with a library’s ParentId.
2. Restrict a user’s access to that library.
3. Log in as that user.
4. Observe that the section header still appears, but no items are shown.

Expected Behavior:

If a user does not have access to a library, the corresponding "Recently Added in ____" section should not appear at all.

Actual Behavior:

The section header is displayed, but with no media content.

Proposed Solution:

Before rendering a "Recently Added in ____" section, validate whether the requesting user has access to the library associated with the ParentId. If the user lacks permission, suppress both the header and its section entirely.

Alternative Approaches:

• Fallback behavior: Hide the section header but display a generic "No content available" message (less ideal, as it still leaks that a library exists).
• Configurable option: Allow admins to choose whether hidden libraries display empty headers or are omitted altogether.