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

tests/Feature/Components/ScaffoldTest.php

@@ -48,6 +48,12 @@ it('puts every destination in the rail and only those marked for the bar in the
         ->and(substr_count($html, 'aria-current="page"'))->toBe(2);
 });
 
+it('takes the caller\'s class and style on its own root', function () {
+    $root = layoutRoot((string) $this->blade('<x-scaffold class="app-shell" style="--material-banner: 4rem" :destinations="$destinations" />', ['destinations' => scaffoldDestinations()]));
+
+    expect($root)->toMatchArray(['<' => 'div', 'data-md-scaffold' => '', 'class' => 'app-shell', 'style' => '--material-banner: 4rem']);
+});
+
 it('speaks a destination\'s badge in its own words when it has them', function () {
     $html = (string) $this->blade('<x-scaffold :destinations="$destinations" />', ['destinations' => [
         ['title' => 'Get started', 'icon' => 'rocket_launch', 'url' => '/start', 'badge' => '0/3', 'badgeLabel' => '0 of 3 done'],
@@ -247,7 +253,7 @@ it('marks the scaffold, and draws the FAB after the page\'s bar and before the p
         BLADE, ['destinations' => scaffoldDestinations()]);
 
     // M3 puts a FAB early in the focus order: after the bar, before the content.
-    expect($html)->toMatch('/^\s*<div\s+data-md-scaffold>/')
+    expect($html)->toMatch('/^\s*<div\s+data-md-scaffold\s*>/')
         ->not->toContain('data-app-shell')
         ->toMatch('/APP BAR.*<div data-md-scaffold-fab><button>NEW<\/button><\/div>\s*<main id="content".*PAGE/s')
         ->and(substr_count($html, 'NEW'))->toBe(1)