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

tests/Feature/Components/ThemeScriptTest.php

@@ -0,0 +1,24 @@
+<?php
+
+it('follows the operating system until the visitor chooses, by default', function () {
+    $this->blade('<x-theme-script />')
+        ->assertSee('({"default":"system","key":"material-theme","legacy":[]})', false);
+});
+
+it('takes the application\'s default, key and legacy keys', function () {
+    config(['livewire-material.theme' => [
+        'default' => 'dark',
+        'storage_key' => 'sealshare-theme',
+        'legacy_keys' => ['mary-theme'],
+    ]]);
+
+    $this->blade('<x-theme-script />')
+        ->assertSee('({"default":"dark","key":"sealshare-theme","legacy":["mary-theme"]})', false);
+});
+
+it('falls back to the operating system for a default it does not know', function () {
+    config(['livewire-material.theme.default' => 'blue']);
+
+    $this->blade('<x-theme-script />')
+        ->assertSee('"default":"system"', false);
+});