Add the snackbar, badges, rich tooltips, alerts, stats and empty states

<x-toast> hosts the snackbar queue for the Toasts concern and
window.materialToast(), one at a time, paused on hover and focus, with
an optional action; it listens from the moment its script loads, so a
toast dispatched before Alpine starts is shown rather than lost.
<x-badge> is M3's dot and count, plus a tonal or outlined status label;
<x-rich-tooltip> is transient or persistent; <x-alert>, <x-stat> and
<x-empty-state> are built from M3's parts.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy

tests/Feature/Components/EmptyStateTest.php

@@ -0,0 +1,17 @@
+<?php
+
+it('sets an icon on an Expressive shape above its words and action', function () {
+    $html = (string) $this->blade(<<<'BLADE'
+        <x-empty-state icon="upload_file" shape="flower" title="No shares yet" description="Files you share appear here.">
+            <x-slot:actions><x-button label="Upload files" /></x-slot:actions>
+        </x-empty-state>
+        BLADE);
+
+    expect($html)
+        ->toContain('text-secondary-container')
+        ->toContain('text-on-secondary-container')
+        ->toContain('<h3 class="type-title-lg">No shares yet</h3>')
+        ->toContain('Files you share appear here.')
+        ->toContain('Upload files')
+        ->and(substr_count($html, '<svg'))->toBe(2);
+});