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/Browser/CommunicationTest.php

@@ -0,0 +1,46 @@
+<?php
+
+const SNACKBAR = "document.querySelector('[x-data=\"materialSnackbar\"] [aria-live]')";
+
+it('shows a toast as a snackbar, then the next in turn', function () {
+    $page = visit('/material')->waitForEvent('networkidle');
+
+    $page->script("materialToast('First', { type: 'success', timeout: 600 }); materialToast('Second', { type: 'error' })");
+
+    $page->assertScript(SNACKBAR."?.textContent.includes('First')")
+        ->assertScript(SNACKBAR."?.getAttribute('role') === 'status'");
+
+    $page->wait(1.2);
+
+    $page->assertScript(SNACKBAR."?.textContent.includes('Second')")
+        ->assertScript(SNACKBAR."?.getAttribute('role') === 'alert'");
+});
+
+it('shows a toast dispatched as a browser event, as the Toasts concern does', function () {
+    $page = visit('/material')->waitForEvent('networkidle')
+        ->assertScript("typeof window.Livewire !== 'undefined' && typeof window.Alpine !== 'undefined'");
+
+    // Through Livewire, in the page's own realm: an event built inside Playwright's evaluate
+    // carries a detail object Firefox's sandbox will not let the page read.
+    $page->script("window.eval(\"Livewire.dispatch('toast', { type: 'info', title: 'Link copied', description: null, timeout: 4000 })\")");
+
+    $page->assertScript(SNACKBAR."?.textContent.includes('Link copied')");
+});
+
+it('runs a toast\'s action and dismisses it', function () {
+    $page = visit('/material')->waitForEvent('networkidle');
+
+    $page->script("window.__undone = false; materialToast('Share deleted', { action: { label: 'Undo', handler: () => window.__undone = true } })");
+
+    $page->click('[x-data="materialSnackbar"] button:has-text("Undo")')
+        ->assertScript('window.__undone === true')
+        ->assertScript(SNACKBAR.' === null');
+});
+
+it('opens a persistent rich tooltip on press', function () {
+    $bubble = "document.querySelector('#communication [role=\"dialog\"][popover]')";
+
+    visit('/material')->waitForEvent('networkidle')
+        ->click('#communication button:has-text("Press for details")')
+        ->assertScript("{$bubble}.matches(':popover-open')");
+});