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>

tests/Feature/Components/DataTest.php

@@ -25,7 +25,7 @@ it('draws 52px rows, 36px dense ones, from its stylesheet in the components laye
     expect($css)->toContain('@layer material.components')
         ->toMatch('/\\[data-md-table\\] \\{\\s*--cell-x: 12px;\\s*--cell-y: var\\(--md-sys-measurement-space200\\);/')
         ->toMatch('/\\[data-md-table\\]\\[data-md-dense\\] \\{\\s*--cell-y: var\\(--md-sys-measurement-space100\\);/')
-        ->toContain('[data-md-table] :where(tbody tr[aria-selected=\'true\'])')
+        ->toContain('[data-md-table] :where(tbody tr:is([aria-selected=\'true\'], [data-md-selected]))')
         ->and((string) file_get_contents(__DIR__.'/../../../resources/css/all.css'))->toContain("@import './components/table.css';");
 });