Each Gantt bar and table row gets a data-conf-key attribute
(ISO start date + conference name). A small JS lookup map connects
them so hovering either element highlights both simultaneously:
- Gantt bar: filter brightness + inset white box-shadow
- Table row: yellow tint via background-color
Hovering a Gantt bar also scrolls the matching table row into view
(scrollIntoView nearest) so future conferences are reachable without
manual scrolling. The key field is pre-computed in
build_conference_timeline() to keep the template simple.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Edward Betts
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