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/siren_question.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M467-360Zm-24 80ZM160-120q-33 0-56.5-23.5T80-200v-80q0-33 23.5-56.5T160-360h40v-200q0-117 81.5-198.5T480-840q117 0 198.5 81.5T760-560v3q0 17-11.5 28.5T720-517q-17 0-28.5-11.5T680-557v-3q0-83-58.5-141.5T480-760q-83 0-141.5 58.5T280-560v200h147q17 0 28.5 11.5T467-320q0 17-11.5 28.5T427-280H160v80h267q17 0 28.5 11.5T467-160q0 17-11.5 28.5T427-120H160Zm560 80q-83 0-141.5-58.5T520-240q0-83 58.5-141.5T720-440q83 0 141.5 58.5T920-240q0 83-58.5 141.5T720-40ZM400-560q0-33 23.5-56.5T480-640q17 0 28.5-11.5T520-680q0-17-11.5-28.5T480-720q-66 0-113 47t-47 113v80q0 17 11.5 28.5T360-440q17 0 28.5-11.5T400-480v-80Zm317 440q11 0 18.5-7.5T743-146q0-11-7.5-18.5T717-172q-11 0-18.5 7.5T691-146q0 11 7.5 18.5T717-120Zm-1-72q8 0 13-5t5-13q0-8 6-16t14-16q14-12 22-23t8-31q0-29-19-46.5T716-360q-19 0-35 9.5T655-325q-4 6-1 12.5t10 9.5q6 3 12.5 0t10.5-8q5-7 12.5-11t16.5-4q15 0 23.5 7.5T748-296q0 11-6 18.5T728-262q-6 6-12.5 12T704-236q-3 6-4.5 12t-1.5 14q0 8 5 13t13 5Z"/></svg>