Hide sort menu for series lists

[IvanPisquiy06]

Closes #12054

fix: Hides the sorting dropdown menu on Series pages.

As discussed on Slack, the sorting logic is currently designed for standard Lists and does not yet support the new Series data structure. This PR hides the UI element on Series pages to prevent user confusion during the beta rollout.

Technical

• File modified: openlibrary/templates/lists/view_body.html
• Implementation: Wrapped the search/sort_options.html template render call in a conditional block ($if not list.key.startswith('/series/'):).
• Note: By checking the list.key namespace at the parent level (view_body), we successfully hide the dropdown for Series without having to alter the shared sort_options.html widget itself. The layout toggle (Grid/List view) is intentionally left outside the condition so it remains functional.

Testing

1. Navigate to any standard User List.
2. Verify that the "Sort by" dropdown is visible and functional.
3. Navigate to any Series page.
4. Verify that the "Sort by" dropdown is completely hidden.
5. Verify that the Layout dropdown (Grid/List) next to it is still visible and functional.

Screenshot

Series example:

List example:

Stakeholders

cc @cdrini - Thanks for pointing me toward this as a good first issue!

[Copilot]

Pull request overview

This PR hides the “Sort by” dropdown on Series pages to avoid presenting sorting controls that don’t currently work for the /series/ namespace, while keeping the layout toggle available.

Changes:

• Wraps the search/sort_options.html render in a conditional so it doesn’t display for list.key under /series/.
• Leaves search/layout_options.html rendering unchanged so Grid/List layout remains available on Series.

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[cdrini]

Great! Lgtm!