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/shopping_bag_speed.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M230-240H90q-17 0-28.5-11.5T50-280q0-17 11.5-28.5T90-320h140q17 0 28.5 11.5T270-280q0 17-11.5 28.5T230-240Zm120-160H170q-17 0-28.5-11.5T130-440q0-17 11.5-28.5T170-480h180q17 0 28.5 11.5T390-440q0 17-11.5 28.5T350-400ZM240-80q-33 0-56.5-23.5T160-160h70q50 0 85-35t35-85q0-11-2-21t-5-19h7q50 0 85-35t35-85q0-51-35-85.5T350-560H210l10-80q4-35 26-57.5t54-22.5h80q8-75 51.5-117.5T550-880q64 0 106.5 47.5T698-720h102q36 1 60 28t19 63l-60 480q-4 30-26.5 49.5T740-80H240Zm220-640h159q1-33-22.5-56.5T540-800q-35 0-55.5 21.5T460-720Z"/></svg>