Sort the list carousel by last_modified

[cdrini]

Addendum to #11187 . Maintains previous, pre-solr behaviour.

Technical

Testing

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[Copilot]

Pull request overview

This PR adds sorting by last_modified to list carousels, maintaining the pre-Solr behavior for list ordering. The changes ensure that when lists are displayed in carousels or accessed via search URLs, they are sorted by their most recent modification date in descending order.

• Adds last_modified desc sorting to the Solr query in get_lists() function
• Appends &sort=last_modified parameter to the list search URL for consistency

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
openlibrary/plugins/openlibrary/lists.py	Adds sort='last_modified desc' parameter to the run_solr_query call in the get_lists() function
openlibrary/plugins/openlibrary/partials.py	Appends &sort=last_modified to the URL query string for the "View All Lists" link

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After thoroughly reviewing the code changes, I found no issues to report. The implementation is consistent and correct:

• Both changes correctly implement sorting by last_modified in descending order
• The URL parameter sort=last_modified in partials.py is automatically normalized to last_modified desc by the ListSearchScheme (as defined in line 42 of schemes/lists.py)
• The direct parameter sort='last_modified desc' in lists.py is the proper format for the run_solr_query function
• Both approaches achieve the same result: sorting lists by most recently modified first

The changes successfully restore the pre-Solr behavior as intended.

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