Header Filters

The component is self-contained: one file, no dependencies, the palette in --vibeui-datagrid-006-*. A client component: three filter states, with the selection made by a case-insensitive substring and by an exact status match. The second row of thead is given over to the fields: a field sits exactly under its own column, so there is no guessing what a shared search box is looking through. Every field has its own aria-label — a placeholder disappears on typing and is not a label. The counter of matches is declared aria-live=polite. An empty result is shown as a row inside tbody: the header and the filters deliberately stay in place. The status is marked with a dot through ::before rather than by the text colour alone. The theme comes from the surrounding color-scheme through light-dark(): by default the grid lays no panel under itself, it sits on the page background, while the background prop switches on a panel of its own.