TableHeader changelog

2026-09-21: Aligned the usage guide, source Prop table, and Site / AI reading entry. Documentation only; component behavior is unchanged.

2026-06-30: v1.1.0 removed static outer corner radii from the first and last header cells; the default divided header keeps straight-edged separators.

2026-06-24: v1.0.1 added the same corner radii to the first and last header cells as in data rows.

2026-06-19: v1.0.0 initial release.