Plan step 38: resources/css/showcase.css, in material.components
beside components/error-page.css for the same reason (a whole page's
chrome, not a reusable component, still outranked by an application's
unlayered CSS by design). Keyed on data-md-showcase-* hooks; batch 1
covers only what the frame (layout, index, section, shell, the example
component) needs beyond the layout components and the text classes.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
