Land a caller's class and style on the scaffold and tooltip roots

Plan step 39 (part 0): the step 38 review found <x-scaffold> and
<x-tooltip> never referencing $attributes, so a caller's class and
style were silently dropped. The scaffold's root is its single
data-md-scaffold div; the tooltip's root, documented in its header, is
the standalone wrapper it draws around a trigger (data-md-tooltip-anchor,
merged with its own anchor-name) — passed an anchor instead, it renders
only a popover fragment beside another component's root and takes
nothing of the caller's.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

resources/views/components/scaffold.blade.php

@@ -101,7 +101,8 @@
      window never clips what overhangs on purpose.
 
      Nothing application-specific belongs in here: an app's destinations and chrome come in through
-     the props and slots. --}}
+     the props and slots. The caller's `class` and `style` land on the root, `data-md-scaffold`
+     itself — the element `style="--material-banner: 4rem"` above sets a custom property on. --}}
 
 @props([
     'destinations' => [],
@@ -137,7 +138,7 @@
     $groups = $items->chunkWhile(fn (array $item, int $key, $chunk): bool => $item['section'] === $chunk->last()['section']);
 @endphp
 
-<div data-md-scaffold>
+<div data-md-scaffold {{ $attributes->only(['class', 'style']) }}>
     <a href="#content" data-md-skip-link>{{ __('Skip to content') }}</a>
 
     @isset($banner)