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

config/livewire-material.php

@@ -34,6 +34,18 @@ return [
         'legacy_keys' => [],
     ],
 
+    /*
+    |--------------------------------------------------------------------------
+    | Node
+    |--------------------------------------------------------------------------
+    |
+    | `php artisan material:scheme` runs Google's colour utilities through Node.
+    | Set the binary when `node` is not on the PATH of the user running Artisan.
+    |
+    */
+
+    'node' => env('MATERIAL_NODE', 'node'),
+
     /*
     |--------------------------------------------------------------------------
     | Showcase