CngxDataGridFooter

The footer row of a CngxDataGridAccordion. Lays its projected cngxDgaCells out on the shared --cngx-dga-columns grid, so a sum or count cell lines up with the column it totals. It is the designated host for a consumer-supplied aria-live region (row count, running totals, load status). The component ships no live producer - the region element and its content are the consumer's, so any state it announces stays owned outside this structural shell.