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New /trees/[id]/sources page (list + create sources). Person-detail page now loads tree sources + citations and shows a '✓ N sourced' badge with an inline cite picker (source + page) on each event and on the person. Tree view links to Sources. Regenerated the OpenAPI client. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Signed-off-by: Justin Paul <justin@jpaul.me>