tanstack-table-core-cell-spanning
Merge adjacent body cells with cellSpanningFeature: value-based rowSpan opt-in per column via spanRows, per-row colSpan via spanColumns, and the covered-cell convention where a span of 0 means skip th
Merge adjacent body cells with cellSpanningFeature: value-based rowSpan opt-in per column via spanRows, per-row colSpan via spanColumns, and the covered-cell convention where a span of 0 means skip th