Add a search to the showcase

A search app bar looks through every section, example and component,
opens the section, or the example at its anchor on its page, and is
reached from anywhere with / or Ctrl+K. Section pages now carry their
own heading.

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

resources/views/showcase/components/example.blade.php

@@ -18,7 +18,7 @@
     }
 @endphp
 
-<div class="space-y-4 rounded-corner-lg bg-surface-container p-4">
+<div @if ($title) id="{{ \NoNameWeb\LivewireMaterial\Showcase\Sections::anchor($title) }}" @endif class="scroll-mt-24 space-y-4 rounded-corner-lg bg-surface-container p-4">
     @if ($title)
         <h3 class="type-title-md">{{ $title }}</h3>
     @endif