Add the M3 Expressive carousel

Multi-browse, hero, uncontained and full-screen layouts on a native
scroll-snap row, with Compose's keyline maths masking each item as it
scrolls. Completes Phase 5.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy

resources/views/showcase/layout.blade.php

@@ -18,7 +18,7 @@
                 <a href="{{ route('livewire-material.showcase') }}" class="shrink-0 type-title-lg max-sm:hidden">Livewire Material</a>
 
                 <nav class="-my-2 flex min-w-0 flex-1 gap-x-4 overflow-x-auto py-2 whitespace-nowrap type-label-lg text-on-surface-variant [scrollbar-width:none]" aria-label="Sections">
-                    @foreach (['colour' => 'Colour', 'type' => 'Type', 'shape' => 'Shape', 'elevation' => 'Elevation', 'motion' => 'Motion', 'icons' => 'Icons', 'buttons' => 'Buttons', 'menus' => 'Menus', 'communication' => 'Communication', 'progress' => 'Progress', 'containment' => 'Containment'] as $anchor => $section)
+                    @foreach (['colour' => 'Colour', 'type' => 'Type', 'shape' => 'Shape', 'elevation' => 'Elevation', 'motion' => 'Motion', 'icons' => 'Icons', 'buttons' => 'Buttons', 'menus' => 'Menus', 'communication' => 'Communication', 'progress' => 'Progress', 'containment' => 'Containment', 'carousel' => 'Carousel'] as $anchor => $section)
                         <a href="#{{ $anchor }}" class="rounded-corner-xs hover:text-on-surface focus-ring">{{ $section }}</a>
                     @endforeach
                 </nav>