Draw M3's focus ring on a dialog's scrolling body

Chrome makes a scroll container with nothing focusable inside a keyboard stop, and
showModal() gives it the dialog's first focus, which showed the browser's own ring.
The body now takes M3's 3px secondary indicator, inset so the dialog's rounded,
overflow-hidden box does not clip it.

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

resources/views/components/modal.blade.php

@@ -139,7 +139,7 @@
         @endif
 
         @if ($body)
-            <div id="{{ $id }}-body" x-dialog-dividers @class([
+            <div id="{{ $id }}-body" data-dialog-body x-dialog-dividers @class([
                 'min-h-0 flex-1 overflow-y-auto px-6 type-body-md text-on-surface-variant',
                 'pt-2' => $header,
                 'max-medium:pt-4' => $header && $barAboveBody,