Remove redundant lists feature flag

[Sanket17052006]

Part of #12946

This PR removes the lists feature flag since it's enabled across all environments.

Technical

• Removed lists: enabled from conf/openlibrary.yml.
• Removed lists field from pydantic-settings Features model in openlibrary/core/features.py.
• Removed is_enabled() override from lists class in openlibrary/plugins/openlibrary/lists.py — parent delegate.page defaults to True, matching the always-on behavior.
• Simplified openlibrary/templates/type/user/view.html — page.get_lists(limit=3) now always runs (was already the case in production); the $else: lists = [] dead branch is removed.
• Simplified openlibrary/templates/lists/widget.html by removing the early return guard.
• Simplified openlibrary/templates/type/edition/view.html, openlibrary/templates/type/author/view.html, and openlibrary/templates/recentchanges/index.html by removing the "lists" in ctx.features branches.
• Removed lists from test fixtures in test_features.py.

Testing

• Ran make test-py-uv PYTEST_ARGS="openlibrary/tests/core/test_features.py"
• Grepped for "lists" in ctx.features and "lists" in web.ctx.features none remains

Screenshot

N/A

Stakeholders

@RayBB

[openlibrary-bot]

Thanks for the PR, @Sanket17052006!

The linked issue hasn't been triaged yet — triage happens on Mondays and Fridays. There are currently 25 open non-draft PRs ahead of yours.

PR triage checklist (maintainers / Richy)

• PR description — not empty; explains what the change does and how to verify it
• References an issue — PR body contains a #NNN reference
  • Linked issue is triaged — has a Priority: * label (not just Needs: Triage)
  • Linked issue is assigned — has at least one assignee
• Commit history clean — no WIP/fixup/conflict noise; commit messages are meaningful
• CI passing — no failing check-runs
• Test cases present — if the change touches substantive logic, test coverage exists or is explained
• Proof of testing — PR body includes a description of what was tested, a screenshot, or a video

Note

This comment was automatically generated by PAM, Open Library's Project AI Manager. PAM provides status visibility, performs basic project management functions, and gives actionable feedback so contributors aren't left waiting.

[RayBB]

Generally looks good but we have some merge conflicts to resolve.

[Sanket17052006]

@RayBB Done!

[RayBB]

Thanks for this one as well. We're making quick progress on this little project!