Observable Ambassadors

Mount viewer with pinned root and add go-to-root button

Self-contained rewrite of math and layout helpers with fresh names

Define and test smooth SU(1,1) interpolation for animated focus transitions

Define viewer with always-visible pinned root

Fix broken markdown table from pipe character conflict

Documentation: how to format your own data section

Worked example intro and sample flat data

Build hierarchy from custom flat data using documented recipe

Mount worked example viewer from custom flat data

Documentation: quick reference card summary