Draw the menu item without Tailwind

<x-menu-item> renders data-md-menu-item, data-md-description and its
aria-* state, with data-md-keep-open renamed from data-keep-open;
menu-item.css draws SegmentedMenuTokens' 48px row, 16px sides, 12px
gaps, 4/12px corners, the selected/current colours and the shared
--md-menu-item-ink icon-class outranks except when disabled
(ACT-11/19/27/28); a submenu's popover shares its container colour
with the menu it opens from and menu.js follows the rename (plan
step 36, actions).

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

resources/css/components.css

@@ -22,6 +22,7 @@
 @import './components/fab.css';
 @import './components/menu-separator.css';
 @import './components/menu-group.css';
+@import './components/menu-item.css';
 
 /* Inputs, selection and data */
 @import './components/form.css';