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

resources/css/material.css

@@ -1,10 +1,29 @@
 /*
- * Livewire Material — the one stylesheet an application imports, after Tailwind:
+ * Livewire Material — the one stylesheet an application imports, after Tailwind, followed by
+ * the scheme `php artisan material:scheme` wrote for it:
  *
  *   @import 'tailwindcss';
  *   @import '../../vendor/nonameweb/livewire-material/resources/css/material.css';
+ *   @import './material-scheme.css';
  *   @source '../../vendor/nonameweb/livewire-material/resources/views';
  *   @source '../../vendor/nonameweb/livewire-material/src';
  *
- * Colour roles, shape, type, motion, elevation and the component styles arrive in 0.2.0.
+ * tokens/scheme.css is the package's own default (M3's baseline purple), so an application
+ * renders before it has a scheme; the application's file declares the same roles later and wins.
  */
+
+@import './tokens/scheme.css';
+@import './tokens/shape.css';
+@import './tokens/elevation.css';
+@import './tokens/motion.css';
+@import './tokens/type.css';
+@import './tokens/font.css';
+@import './tokens/theme.css';
+@import './tokens/state.css';
+
+@layer base {
+    html {
+        background-color: var(--md-sys-color-surface);
+        color: var(--md-sys-color-on-surface);
+    }
+}