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/outlined/folder_off.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M880-640v351q0 20-12.5 30T840-249q-15 0-27.5-10.5T800-290v-350H467q-16 0-30.5-6T411-663l-68-68q-14-14-12.5-30t12.5-27q11-11 27-12.5t30 12.5l68 68h332q33 0 56.5 23.5T880-640ZM160-160q-33 0-56.5-23.5T80-240v-480q0-33 23.5-56.5T160-800l80 80h-80v480h447L56-792q-11-11-11.5-27.5T56-848q11-11 28-11t28 11l736 736q12 12 11.5 28T847-56q-12 11-28 11.5T791-56L687-160H160Zm208-320Zm209-17Z"/></svg>