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/AlertTest.php

@@ -0,0 +1,34 @@
+<?php
+
+it('states a notice in its state\'s container, with the state\'s icon', function () {
+    $html = (string) $this->blade('<x-alert title="Storage almost full" description="3.8 of 4 GB" color="warning" />');
+
+    expect($html)
+        ->toContain('role="alert"')
+        ->toContain('bg-warning-container text-on-warning-container')
+        ->toContain('Storage almost full')
+        ->toContain('3.8 of 4 GB')
+        ->toContain('<svg');
+});
+
+it('is a status unless it is an error or a warning', function () {
+    expect((string) $this->blade('<x-alert description="Saved." tone="success" />'))->toContain('role="status"')->toContain('bg-success-container')
+        ->and((string) $this->blade('<x-alert description="Heads up." />'))->toContain('role="status"')->toContain('bg-info-container')
+        ->and((string) $this->blade('<x-alert description="Broken." color="error" />'))->toContain('role="alert"');
+});
+
+it('takes actions, drops its icon on request, and can be dismissed', function () {
+    $html = (string) $this->blade(<<<'BLADE'
+        <x-alert :icon="false" dismissible>
+            The connection dropped.
+            <x-slot:actions><x-button label="Try again" /></x-slot:actions>
+        </x-alert>
+        BLADE);
+
+    expect($html)
+        ->toContain('The connection dropped.')
+        ->toContain('Try again')
+        ->toContain('x-data="{ shown: true }"')
+        ->toContain('aria-label="Dismiss"')
+        ->and(substr_count($html, '<svg'))->toBe(1);
+});