Cursor format: base64(iso8601_created_at|image_id). Pagination key is
(created_at DESC, id DESC) so we don't drift when new imports land between
page loads. Timeline groups by date_part(year, month) so the sidebar can
render year-month jump buckets. get_image_with_tags returns full image
detail plus prev/next ids so the modal viewer can navigate without an
extra round-trip per arrow press.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
