Plan step 38: every two-column layout moves onto <x-grid> with
<x-stack> columns; the checkbox group's card, its legend and the two
search demos' bespoke geometry (an avatar chip, the compact
search-icon-button bar) move to data-md-showcase-* hooks. The two
small demo controls and the "Narrower" field's override move to
.showcase-w-sm/-xs/-narrow — plain, unlayered classes, since
<x-input> and <x-datepicker> forward only class and style to the
element that needs sizing, never a data attribute. "Narrower"'s hint
is reworded from "A max-w-* class" to "An unlayered rule from the
call site wins", since that is now the mechanism being shown.
FieldsTest's Chromium selectors run against an isolated fieldProbe
fixture, not this page, so nothing there is at risk; #fields and every
id (showcase-error, showcase-error-filled, showcase-audience,
showcase-radio-theme) is unchanged.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
