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/AttributeNode.php

@@ -0,0 +1,73 @@
+<?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>[<namespace>|<attribute> <operator> <value>]" node.
+ *
+ * This component is a port of the Python cssselect library,
+ * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
+ *
+ * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
+ */
+class AttributeNode extends AbstractNode
+{
+    public function __construct(
+        private NodeInterface $selector,
+        private ?string $namespace,
+        private string $attribute,
+        private string $operator,
+        private ?string $value,
+    ) {
+    }
+
+    public function getSelector(): NodeInterface
+    {
+        return $this->selector;
+    }
+
+    public function getNamespace(): ?string
+    {
+        return $this->namespace;
+    }
+
+    public function getAttribute(): string
+    {
+        return $this->attribute;
+    }
+
+    public function getOperator(): string
+    {
+        return $this->operator;
+    }
+
+    public function getValue(): ?string
+    {
+        return $this->value;
+    }
+
+    public function getSpecificity(): Specificity
+    {
+        return $this->selector->getSpecificity()->plus(new Specificity(0, 1, 0));
+    }
+
+    public function __toString(): string
+    {
+        $attribute = $this->namespace ? $this->namespace.'|'.$this->attribute : $this->attribute;
+
+        return 'exists' === $this->operator
+            ? \sprintf('%s[%s[%s]]', $this->getNodeName(), $this->selector, $attribute)
+            : \sprintf("%s[%s[%s %s '%s']]", $this->getNodeName(), $this->selector, $attribute, $this->operator, $this->value);
+    }
+}