News-Bearbeitung gefixt: Feldnamen im Model an Controller & Formular angepasst, keine Notices mehr beim Editieren.

Views/News/editNewsForm.phtml

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+<div class="inhalt">
+  <div class="form-container">
+    <h1>News bearbeiten</h1>
+    <?php if (!empty($errors['news'])): ?>
+      <div class="form-error"><?=htmlspecialchars($errors['news'])?></div>
+    <?php endif; ?>
+    <form class="form-horizontal" action="index.php" method="post">
+      <input type="hidden" name="controller" value="News">
+      <input type="hidden" name="do" value="updateNews">
+      <input type="hidden" name="id" value="<?=htmlspecialchars($id ?? '')?>">
+      <label for="name">Titel</label>
+      <input type="text" name="name" id="name" required value="<?=htmlspecialchars($validData['name'] ?? '')?>">
+      <label for="date">Datum</label>
+      <input type="date" name="date" id="date" required value="<?=htmlspecialchars($validData['date'] ?? date('Y-m-d'))?>">
+      <label for="description">Beschreibung</label>
+      <textarea name="description" id="description" rows="7" required><?=htmlspecialchars($validData['description'] ?? '')?></textarea>
+      <button class="button-register" type="submit">Änderungen speichern</button>
+    </form>
+    <a href="?controller=News&do=showNews">Zurück zur Übersicht</a>
+  </div>
+</div>

Views/News/showEditSuccess.phtml

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+<div class="inhalt">
+  <div class="login-success">
+    <h2>News erfolgreich bearbeitet!</h2>
+    <p>Du wirst in wenigen Sekunden zur Übersicht weitergeleitet...</p>
+  </div>
+</div>
+<script>
+  setTimeout(function() {
+    window.location.href = "?controller=News&do=showNews";
+  }, 2000);
+</script>
+<noscript>
+  <meta http-equiv="refresh" content="2;url=?controller=News&do=showNews">
+</noscript>