Add the Material 3 Expressive foundation

Colour, shape, type, elevation and motion as tokens and Tailwind
utilities; `php artisan material:scheme`, which generates an app's colour
roles with Google's material-color-utilities (spec 2025); the theme head
script with light, dark and system and its Alpine store; Google Sans Flex;
every Material Symbol (4,135, outlined and filled) drawn by <x-icon>
without blade-icons; all 35 M3 Expressive shapes, ported from androidx, as
<x-shape>; the x-figure directive; the Toasts concern; DesignGuard for
applications' tests; and a showcase with every token, both themes side by
side and an icon search.

Colour utilities are `@theme inline`, so a section with its own
data-theme repaints; without it they resolve once on :root.

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

src/Http/Controllers/ShowcaseSymbolController.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace NoNameWeb\LivewireMaterial\Http\Controllers;
+
+use Illuminate\Http\Response;
+use Illuminate\View\ComponentAttributeBag;
+use InvalidArgumentException;
+use NoNameWeb\LivewireMaterial\Support\SvgFile;
+
+/**
+ * One Material Symbol as an SVG file, for the showcase's icon search: drawing the matches as
+ * CSS masks keeps 4,000 names searchable without rendering 4,000 inline SVGs.
+ */
+class ShowcaseSymbolController
+{
+    public function __invoke(string $style, string $name): Response
+    {
+        abort_unless(in_array($style, ['outlined', 'filled'], true), 404);
+
+        try {
+            $svg = SvgFile::symbol($name, $style === 'filled', new ComponentAttributeBag);
+        } catch (InvalidArgumentException) {
+            abort(404);
+        }
+
+        return response($svg->toHtml(), 200, [
+            'Content-Type' => 'image/svg+xml',
+            'Cache-Control' => 'public, max-age=86400',
+        ]);
+    }
+}