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/airline_seat_recline_extra.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M340-720q-33 0-56.5-23.5T260-800q0-33 23.5-56.5T340-880q33 0 56.5 23.5T420-800q0 33-23.5 56.5T340-720Zm180 560H302q-33 0-60.5-23.5T207-240l-78-392q-4-19 8-33.5t32-14.5q14 0 25 9t14 23l82 408h230q17 0 28.5 11.5T560-200q0 17-11.5 28.5T520-160Zm240 45-96-165H386q-29 0-50.5-17.5T308-344l-44-214q-11-48 22.5-85t81.5-37q35 0 63.5 21t36.5 57l44 202h130q21 0 39 11t29 29l120 205q8 14 3.5 30.5T815-100q-14 8-30.5 3.5T760-115Z"/></svg>