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/svg/symbols/filled/brand_awareness.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M760-440h-80q-17 0-28.5-11.5T640-480q0-17 11.5-28.5T680-520h80q17 0 28.5 11.5T800-480q0 17-11.5 28.5T760-440ZM584-288q10-14 26-16t30 8l64 48q14 10 16 26t-8 30q-10 14-26 16t-30-8l-64-48q-14-10-16-26t8-30Zm120-424-64 48q-14 10-30 8t-26-16q-10-14-8-30t16-26l64-48q14-10 30-8t26 16q10 14 8 30t-16 26ZM280-360H160q-17 0-28.5-11.5T120-400v-160q0-17 11.5-28.5T160-600h120l132-132q19-19 43.5-8.5T480-703v446q0 27-24.5 37.5T412-228L280-360Z"/></svg>