Draw the stat card without Tailwind

Plan step 36 (actions). <x-stat> renders data-md-stat with
data-md-stat-header/-value/-description/-extra; no class list.
stat.css draws the surface-container panel, the label-large header,
the value as an emphasized-headline-md hero with tabular figures, and
the body-small description. StatTest is rewritten on the hooks and
ComponentStylesheet.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

resources/css/components.css

@@ -30,6 +30,7 @@
 @import './components/toast.css';
 @import './components/progress.css';
 @import './components/alert.css';
+@import './components/stat.css';
 
 /* Inputs, selection and data */
 @import './components/form.css';