Add ui/DataTable, which builds ReUI's DataGrid from `columns` and `data`, and move
all 23 tables onto it. What the grid does not take (a class on a row or cell,
`aria-sort`, `style`, `colSpan`, `role`, `hidden`) is put on the elements it drew
after every render. The column definitions keep their identity between renders, so
cells are not mounted again, and the grid's own paging is off.
The stacked rows on a phone, the column labels and the sort order of the original
work as before. In Blocking > Lists a group heading is a row whose first cell spans
the four columns. docs/reui-migration-plan.md records it.
Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
