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/eda.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M320-880q17 0 28.5 11.5T360-840v320q0 17-11.5 28.5T320-480q-17 0-28.5-11.5T280-520v-320q0-17 11.5-28.5T320-880Zm160-40q17 0 28.5 11.5T520-880v360q0 17-11.5 28.5T480-480q-17 0-28.5-11.5T440-520v-360q0-17 11.5-28.5T480-920Zm120 603v-483q0-17 11.5-28.5T640-840q17 0 28.5 11.5T680-800v436l-80 47Zm-400-3v120q0 33 23.5 56.5T280-120h267q8 0 15-3.5t13-8.5l182-182-226 131q-26 15-56 9t-48-30l-87-116H200Zm80 280q-66 0-113-47t-47-113v-200h220q19 0 36 8.5t28 23.5l86 115 190-111 90-52q21-12 44.5-10.5T858-411q25 19 27 50t-20 53L632-75q-17 17-39 26t-46 9H280Zm-80-360h-80v-360q0-17 11.5-28.5T160-800q17 0 28.5 11.5T200-760v360Zm0-80h400-400Zm80 360h295-295Z"/></svg>