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/android_cell_4_bar_plus.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M60-220v-200q0-25 17.5-42.5T120-480q25 0 42.5 17.5T180-420v200q0 25-17.5 42.5T120-160q-25 0-42.5-17.5T60-220Zm240 0v-300q0-25 17.5-42.5T360-580q25 0 42.5 17.5T420-520v300q0 25-17.5 42.5T360-160q-25 0-42.5-17.5T300-220Zm480-259v-261q0-25 17.5-42.5T840-800q25 0 42.5 17.5T900-740v287q-27-16-57.5-22.5T780-479Zm-20 239h-40q-17 0-28.5-11.5T680-280q0-17 11.5-28.5T720-320h40v-40q0-17 11.5-28.5T800-400q17 0 28.5 11.5T840-360v40h40q17 0 28.5 11.5T920-280q0 17-11.5 28.5T880-240h-40v40q0 17-11.5 28.5T800-160q-17 0-28.5-11.5T760-200v-40Zm-220 30v-410q0-25 17.5-42.5T600-680q25 0 42.5 17.5T660-620v207q-31 26-45.5 60.5T600-280q0 29 7.5 55t21.5 49q-7 8-17 12t-22 4q-21 0-35.5-14.5T540-210Z"/></svg>