Port the six forum widgets from the reference theme: posts list,
multi-tab posts, plate list (default and card), plate info, moderator
list and topic list. They join the schema widget catalog under a forum
group that stays hidden while the forum module is off, reuse the shared
forum cards, paginate through the widget REST client contract, and pull
the forum stylesheet/runtime onto any sidebar that hosts them.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
kate522andClaude Fable 5
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