Fill a selected row written by hand in secondary-container again

1.x drew `data-selected` on any `data-list-row` that was not a card in
secondary-container with on-secondary-container ink, whatever element
the row was. 2.0.0 kept that only for `<x-list-item selected>` and a
table row's `aria-selected="true"`, so an application's own `<li>`,
`<div>` or `<tr>` with `data-md-list-row` and `data-md-selected` - the
contract list-rows.js still describes - lost its selected state without
a word. list-item.css now fills such a row, cards and list items
excluded, and names the fill `--md-list-row-fill`, so hover, focus and
press tint it as they tint a selected list item rather than replacing
it (1.x's selected fill hid them). In `<x-table>`, `data-md-selected`
selects a plain row too, beside `aria-selected="true"`, which ARIA
allows on a row only in a grid. A browser test compares a hand-made
selected `<li>` and a plain selected `<tr>` with the role pair in the
light and dark themes, checks that a selected card keeps its own fill
and that hover tints the row's fill; it fails without the change.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

resources/css/components/table.css

@@ -7,7 +7,8 @@
  * always wins, whatever layer it comes from. Header cells in title-small on-surface-variant over an
  * outline-variant rule, body cells in body-medium between outline-variant rules — the role itself,
  * never a fraction of it, since M3 reserves opacity for state layers and disabled. A selected row
- * (`aria-selected="true"`) is secondary-container. A row that opens something is `data-md-list-row`
+ * (`data-md-selected`, or `aria-selected="true"` where the table is a grid, the only place ARIA
+ * allows it on a row) is secondary-container. A row that opens something is `data-md-list-row`
  * and answers a pointer as a list row does (components/list-item.css, shared with `<x-card>` and
  * `<x-list-item>`); a selected one names its fill `--md-list-row-fill`, so that state layer is laid
  * over the secondary-container rather than in place of it.
@@ -84,7 +85,7 @@
         border-bottom: 0;
     }
 
-    [data-md-table] :where(tbody tr[aria-selected='true']) {
+    [data-md-table] :where(tbody tr:is([aria-selected='true'], [data-md-selected])) {
         --md-list-row-fill: var(--md-sys-color-secondary-container);
 
         background-color: var(--md-list-row-fill);