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/SchemeCommandTest.php

@@ -0,0 +1,80 @@
+<?php
+
+use Illuminate\Support\Facades\File;
+use Illuminate\Support\Str;
+
+beforeEach(function () {
+    $this->stylesheet = sys_get_temp_dir().'/material-scheme-'.Str::random(8).'.css';
+    $this->data = Str::replaceLast('.css', '.json', $this->stylesheet);
+});
+
+afterEach(function () {
+    File::delete([$this->stylesheet, $this->data]);
+});
+
+it('writes the scheme as a stylesheet and as data', function () {
+    $this->artisan('material:scheme', ['seed' => '#4F46E5', '--output' => $this->stylesheet])
+        ->assertSuccessful();
+
+    $scheme = json_decode(File::get($this->data), true);
+    $stylesheet = File::get($this->stylesheet);
+
+    expect($scheme)
+        ->seed->toBe('#4f46e5')
+        ->variant->toBe('tonal-spot')
+        ->spec->toBe('2025')
+        ->and(array_keys($scheme['dark']))->toEqual(array_keys($scheme['light']))
+        ->and($scheme['light'])->toHaveKeys(['primary', 'on-primary', 'tertiary-container', 'surface-container-high', 'outline-variant', 'success', 'on-warning-container', 'info-container'])
+        ->and($scheme['light']['surface'])->not->toBe($scheme['dark']['surface'])
+        ->and($scheme['light']['inverse-success'])->toBe($scheme['dark']['success']);
+
+    foreach (['light' => "[data-theme='light']", 'dark' => "[data-theme='dark']"] as $theme => $selector) {
+        $block = Str::of($stylesheet)->after($selector)->before('}')->toString();
+
+        expect($block)->toContain("color-scheme: {$theme};");
+
+        foreach ($scheme[$theme] as $role => $hex) {
+            expect($block)->toContain("--md-sys-color-{$role}: {$hex};");
+        }
+    }
+
+    expect($stylesheet)->toContain('php artisan material:scheme "#4f46e5" --variant=tonal-spot');
+});
+
+it('generates a different scheme per variant', function () {
+    $this->artisan('material:scheme', ['seed' => '#4f46e5', '--variant' => 'vibrant', '--output' => $this->stylesheet])
+        ->assertSuccessful();
+
+    $vibrant = json_decode(File::get($this->data), true);
+
+    $this->artisan('material:scheme', ['seed' => '#4f46e5', '--output' => $this->stylesheet])
+        ->assertSuccessful();
+
+    $tonalSpot = json_decode(File::get($this->data), true);
+
+    expect($vibrant['variant'])->toBe('vibrant')
+        ->and($vibrant['light']['primary'])->not->toBe($tonalSpot['light']['primary']);
+});
+
+it('refuses a seed that is not a colour', function () {
+    $this->artisan('material:scheme', ['seed' => 'indigo', '--output' => $this->stylesheet])
+        ->expectsOutputToContain('#rrggbb')
+        ->assertFailed();
+
+    expect(File::exists($this->stylesheet))->toBeFalse();
+});
+
+it('refuses an unknown variant', function () {
+    $this->artisan('material:scheme', ['seed' => '#4f46e5', '--variant' => 'loud', '--output' => $this->stylesheet])
+        ->expectsOutputToContain('Unknown variant "loud"')
+        ->assertFailed();
+});
+
+it('fails without writing anything when node cannot run', function () {
+    config(['livewire-material.node' => '/nonexistent/node']);
+
+    $this->artisan('material:scheme', ['seed' => '#4f46e5', '--output' => $this->stylesheet])
+        ->assertFailed();
+
+    expect(File::exists($this->stylesheet))->toBeFalse();
+});