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

bin/fetch-symbols

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+#
+# Refresh resources/svg/symbols from google/material-design-icons (Apache-2.0).
+#
+# Material Symbols Rounded at weight 400, grade 0 and optical size 24, outlined and
+# filled, for every symbol Google publishes. Maintenance only: applications never run
+# this, and bin/ is not part of the archive Composer installs.
+#
+# The repository is ~5 GB, so it is cloned without blobs and checked out sparsely:
+# git downloads only the two files per symbol that are kept. The @material-symbols
+# npm packages were not used because their SVGs are drawn at optical size 48, whose
+# strokes are thinner than the 24px design.
+
+set -euo pipefail
+
+root="$(cd "$(dirname "$0")/.." && pwd)"
+work="$(mktemp -d)"
+trap 'rm -rf "$work"' EXIT
+
+git clone --quiet --depth=1 --filter=blob:none --no-checkout \
+    https://github.com/google/material-design-icons.git "$work/repo"
+
+cd "$work/repo"
+
+git sparse-checkout set --no-cone \
+    '/symbols/web/*/materialsymbolsrounded/*_24px.svg' \
+    '!/symbols/web/*/materialsymbolsrounded/*_wght[0-9]*' \
+    '!/symbols/web/*/materialsymbolsrounded/*_grad200*' \
+    '!/symbols/web/*/materialsymbolsrounded/*_gradN25*'
+
+git checkout --quiet "$(git symbolic-ref --short HEAD)"
+
+out="$root/resources/svg/symbols"
+rm -rf "$out/outlined" "$out/filled"
+mkdir -p "$out/outlined" "$out/filled"
+
+# Google's files carry width="24" height="24" and no fill. Drop the size so CSS decides
+# it, and paint in currentColor so an icon takes the colour of the text around it.
+normalise() {
+    sed -E \
+        -e 's/ (width|height)="[0-9]+"//g' \
+        -e 's/<svg /<svg fill="currentColor" /' \
+        "$1"
+}
+
+missing=0
+
+for dir in symbols/web/*/materialsymbolsrounded; do
+    name="$(basename "$(dirname "$dir")")"
+    outlined="$dir/${name}_24px.svg"
+    filled="$dir/${name}_fill1_24px.svg"
+
+    if [[ ! -f "$outlined" || ! -f "$filled" ]]; then
+        echo "skipped $name: no outlined and filled 24px pair" >&2
+        missing=$((missing + 1))
+        continue
+    fi
+
+    normalise "$outlined" > "$out/outlined/$name.svg"
+    normalise "$filled" > "$out/filled/$name.svg"
+done
+
+git rev-parse HEAD > "$out/SOURCE"
+
+echo "$(ls "$out/outlined" | wc -l | tr -d ' ') symbols from google/material-design-icons@$(cut -c1-12 "$out/SOURCE"), $missing skipped"