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/healing.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M218-104 104-218q-23-23-23-56t23-56l526-526q23-23 56-23t56 23l114 114q23 23 23 56t-23 56L330-104q-23 23-56 23t-56-23Zm290-122 226-226 122 122q23 23 23 56t-23 56L742-104q-23 23-56 23t-56-23L508-226Zm-28-134q17 0 28.5-11.5T520-400q0-17-11.5-28.5T480-440q-17 0-28.5 11.5T440-400q0 17 11.5 28.5T480-360Zm-80-80q17 0 28.5-11.5T440-480q0-17-11.5-28.5T400-520q-17 0-28.5 11.5T360-480q0 17 11.5 28.5T400-440Zm160 0q17 0 28.5-11.5T600-480q0-17-11.5-28.5T560-520q-17 0-28.5 11.5T520-480q0 17 11.5 28.5T560-440Zm-335-69L104-630q-23-23-23-56t23-56l114-114q23-23 56-23t56 23l122 122-227 225Zm255-11q17 0 28.5-11.5T520-560q0-17-11.5-28.5T480-600q-17 0-28.5 11.5T440-560q0 17 11.5 28.5T480-520Z"/></svg>