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/pedal_bike.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960"><path d="M200-160q-85 0-142.5-57.5T0-360q0-85 58.5-142.5T200-560q77 0 129.5 46T396-400h26l-72-200h-30q-17 0-28.5-11.5T280-640q0-17 11.5-28.5T320-680h120q17 0 28.5 11.5T480-640q0 17-11.5 28.5T440-600h-4l14 40h192l-58-160h-64q-17 0-28.5-11.5T480-760q0-17 11.5-28.5T520-800h64q26 0 46.5 14t29.5 38l68 186h32q83 0 141.5 58.5T960-362q0 84-58 143t-142 59q-72 0-126.5-45T564-320H396q-14 69-68 114.5T200-160Zm112-160v-80h-72q-17 0-28.5 11.5T200-360q0 17 11.5 28.5T240-320h72Zm196-80h56q5-23 13.5-43t22.5-37H478l30 80Zm174-52 24 68q5 16 20.5 23t31.5 1q16-6 23-21t1-31l-26-68-74 28Z"/></svg>