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/auto_stories_off.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M452-180q-43-29-92-44.5T260-240q-42 0-82.5 11T100-198q-21 11-40.5-1T40-234v-482q0-11 5.5-21T62-752q6-3 11.5-6t11.5-5l-31-31q-11-11-11-28t11-28q11-11 28-11t28 11l740 740q11 11 11 28t-11 28q-11 11-28 11t-28-11L618-230q-29 8-56.5 20.5T508-180q-13 8-28 8t-28-8Zm28-414L274-800q47 2 92 13t87 32q13 6 20 18.5t7 26.5v116Zm0 338q18-11 36.5-20t38.5-17l-75-75v112Zm161-177-81-81v-193q0-16 6-30.5t17-25.5l109-109q19-19 43.5-8.5T760-843v267q0 17-6.5 33T734-516l-93 83Zm240 240L758-316q21 3 41.5 8t40.5 12v-420q0-20 12.5-30t27.5-10q15 0 27.5 10t12.5 30v482q0 17-11.5 28.5T881-193Z"/></svg>