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/speed.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M418-340q25 25 63 23.5t55-27.5l169-253q9-14-2.5-25.5T677-625L424-456q-26 18-28.5 54.5T418-340ZM204-160q-22 0-40.5-9.5T134-198q-26-47-40-97.5T80-400q0-83 31.5-156T197-683q54-54 127-85.5T480-800q82 0 154 31t126 84.5q54 53.5 86 125T879-406q1 55-12.5 107.5T825-198q-11 19-29.5 28.5T755-160H204Z"/></svg>