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/league/commonmark/src/Normalizer/TextNormalizer.php

@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace League\CommonMark\Normalizer;
+
+/***
+ * Normalize text input using the steps given by the CommonMark spec to normalize labels
+ *
+ * @see https://spec.commonmark.org/0.29/#matches
+ *
+ * @psalm-immutable
+ */
+final class TextNormalizer implements TextNormalizerInterface
+{
+    /**
+     * {@inheritDoc}
+     *
+     * @psalm-pure
+     */
+    public function normalize(string $text, array $context = []): string
+    {
+        // Collapse internal whitespace to single space and remove
+        // leading/trailing whitespace
+        $text = \preg_replace('/[ \t\r\n]+/', ' ', \trim($text));
+        \assert(\is_string($text));
+
+        // Is it strictly ASCII? If so, we can use strtolower() instead (faster)
+        if (\mb_check_encoding($text, 'ASCII')) {
+            return \strtolower($text);
+        }
+
+        return \mb_convert_case($text, \MB_CASE_FOLD, 'UTF-8');
+    }
+}