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/not_accessible_forward.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="m763-84-60-59h23q0 10-6.5 16.5T703-120q-10 0-16.5-6.5T680-143v-23L526-320h-86q-44 0-68-37.5t-6-78.5l14-30L83-763q-12-12-12-28.5T83-820q12-12 28.5-12t28.5 12l680 680q12 12 12 28t-12 28q-12 12-28.5 12T763-84Zm-3-230L654-420h26q33 0 56.5 23.5T760-340v26ZM593-481 394-680h164q45 0 68.5 36.5T632-566l-39 85ZM320-80q-83 0-141.5-58.5T120-280q0-83 58.5-141.5T320-480v80q-50 0-85 35t-35 85q0 50 35 85t85 35q50 0 85-35t35-85h80q0 83-58.5 141.5T320-80Zm320-620q-33 0-56.5-23.5T560-780q0-33 23.5-56.5T640-860q33 0 56.5 23.5T720-780q0 33-23.5 56.5T640-700Z"/></svg>