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/books_movies_and_music.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M200-80q-33 0-56.5-23.5T120-160v-495q0-25 13.5-45.5T170-730l320-128q40-16 75 8t35 67v63q33 0 56.5 23.5T680-640v80q-117 0-198.5 81.5T400-280q0 57 22 109t63 91H200Zm160-640h160v-62l-160 62ZM680-80q-83 0-141.5-58.5T480-280q0-83 58.5-141.5T680-480q83 0 141.5 58.5T880-280q0 83-58.5 141.5T680-80Zm-19-119 102-64q10-6 10-17t-10-17l-102-64q-10-6-20.5-.5T630-344v128q0 12 10.5 17.5t20.5-.5Z"/></svg>