Stand: SMTP-Test, Admin-Mail-Tab, Notifiable-Fix, Lazy-Quill

- Fix: Notifiable-Trait zum User-Model hinzugefuegt (behebt notify()-500er)
- Installer: SMTP-Verbindungstest mit EsmtpTransport + Ueberspringen-Link
- Admin: Neuer E-Mail-Tab mit SMTP-Konfiguration + Verbindungstest
- Admin: Lazy Quill-Initialisierung (nur sichtbare Locale wird geladen)
- Uebersetzungen: 17 neue Mail-Keys in allen 6 Sprachen

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vendor/symfony/css-selector/Node/MatchingNode.php

@@ -0,0 +1,55 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\CssSelector\Node;
+
+/**
+ * Represents a "<selector>:is(<subSelectorList>)" node.
+ *
+ * This component is a port of the Python cssselect library,
+ * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
+ *
+ * @author Hubert Lenoir <lenoir.hubert@gmail.com>
+ *
+ * @internal
+ */
+class MatchingNode extends AbstractNode
+{
+    /**
+     * @param array<NodeInterface> $arguments
+     */
+    public function __construct(
+        public readonly NodeInterface $selector,
+        public readonly array $arguments = [],
+    ) {
+    }
+
+    public function getSpecificity(): Specificity
+    {
+        $argumentsSpecificity = array_reduce(
+            $this->arguments,
+            fn ($c, $n) => 1 === $n->getSpecificity()->compareTo($c) ? $n->getSpecificity() : $c,
+            new Specificity(0, 0, 0),
+        );
+
+        return $this->selector->getSpecificity()->plus($argumentsSpecificity);
+    }
+
+    public function __toString(): string
+    {
+        $selectorArguments = array_map(
+            fn ($n): string => ltrim((string) $n, '*'),
+            $this->arguments,
+        );
+
+        return \sprintf('%s[%s:is(%s)]', $this->getNodeName(), $this->selector, implode(', ', $selectorArguments));
+    }
+}