Draw the menu group without Tailwind

<x-menu-group> renders data-md-menu-group with data-md-gap and no
class list; menu-group.css draws the plain cluster's 4px padding and
the gapped Expressive layout's 2px item gap and 8px cluster margin
from SegmentedMenuTokens (plan step 36, actions).

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

resources/views/components/menu-group.blade.php

@@ -16,7 +16,9 @@
      list round and each cluster reads as one block. Clusters stand 8px apart, the same 8px a
      separator keeps above and below its line, so a menu is the same height whichever it uses.
      SegmentedMenuTokens' own GroupShape is 8dp where the library's list ends are 12dp; the
-     library's shape wins, so a cluster's ends and a list's ends match. --}}
+     library's shape wins, so a cluster's ends and a list's ends match.
+
+     Drawn by resources/css/components/menu-group.css from `data-md-gap`. --}}
 
 @props([
     'label' => null,
@@ -24,24 +26,21 @@
 ])
 
 @php
-    $attributes = $attributes
-        ->class([
-            'py-1 first:pt-0 last:pb-0' => ! $gap,
-            'not-first:mt-2' => $gap,
-        ])
-        ->merge(array_filter([
-            'role' => 'group',
-            'aria-label' => $label,
-        ], fn ($value): bool => filled($value)));
+    $attributes = $attributes->merge(array_filter([
+        'data-md-menu-group' => true,
+        'data-md-gap' => $gap ? true : null,
+        'role' => 'group',
+        'aria-label' => filled($label) ? $label : null,
+    ], fn ($value): bool => $value !== null));
 @endphp
 
 <div {{ $attributes }}>
     @if (filled($label))
-        <div aria-hidden="true" class="px-4 pt-2 pb-1 type-label-lg text-on-surface-variant">{{ $label }}</div>
+        <div data-md-menu-group-label aria-hidden="true">{{ $label }}</div>
     @endif
 
     @if ($gap)
-        <div class="space-y-0.5">{{ $slot }}</div>
+        <div data-md-menu-group-items>{{ $slot }}</div>
     @else
         {{ $slot }}
     @endif