Add M3 Expressive progress indicators

<x-progress>: linear or circular, flat or wavy, determinate or
indeterminate, 4px or thick, in any colour role, following a server value
through Livewire morphs or an Alpine expression in the browser. The first
frame is server-rendered SVG; Compose Material 3's drawing and keyframes
are ported to an Alpine component that animates only while something
moves and the indicator is on screen.

The previous commit already imported progress.js and included its
showcase section without the files; this adds them.

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="type-title-lg">Livewire Material</a>
 
                 <nav class="flex flex-wrap gap-x-4 gap-y-1 type-label-lg text-on-surface-variant" aria-label="Sections">
-                    @foreach (['colour' => 'Colour', 'type' => 'Type', 'shape' => 'Shape', 'elevation' => 'Elevation', 'motion' => 'Motion', 'icons' => 'Icons', 'buttons' => 'Buttons', 'menus' => 'Menus', 'communication' => 'Communication'] as $anchor => $section)
+                    @foreach (['colour' => 'Colour', 'type' => 'Type', 'shape' => 'Shape', 'elevation' => 'Elevation', 'motion' => 'Motion', 'icons' => 'Icons', 'buttons' => 'Buttons', 'menus' => 'Menus', 'communication' => 'Communication', 'progress' => 'Progress'] as $anchor => $section)
                         <a href="#{{ $anchor }}" class="rounded-corner-xs hover:text-on-surface focus-ring">{{ $section }}</a>
                     @endforeach
                 </nav>