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/drive_file_rename_outline.svg

@@ -0,0 +1 @@
+<svg fill="currentColor" xmlns="http://www.w3.org/2000/svg"><path d="m10 21 4-4h6q.825 0 1.413.587Q22 18.175 22 19q0 .825-.587 1.413Q20.825 21 20 21Zm8.3-12.075-4.25-4.2 1.4-1.4q.575-.575 1.413-.575.837 0 1.412.575l1.4 1.4q.575.575.6 1.388.025.812-.55 1.387ZM3 21q-.425 0-.712-.288Q2 20.425 2 20v-2.825q0-.2.075-.387.075-.188.225-.338l10.3-10.3 4.25 4.25-10.3 10.3q-.15.15-.337.225-.188.075-.388.075Z"/></svg>