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

routes/showcase.php

@@ -1,5 +1,8 @@
 <?php
 
 use Illuminate\Support\Facades\Route;
+use NoNameWeb\LivewireMaterial\Http\Controllers\ShowcaseSymbolController;
 
 Route::view('/', 'livewire-material::showcase.index')->name('showcase');
+
+Route::get('symbols/{style}/{name}.svg', ShowcaseSymbolController::class)->name('symbol');