refactor: modularize handleSave, handleChange, and handleDisplayEinschalten in KueModal

components/modales/kueModal/handlers/handleChange.js

@@ -0,0 +1,11 @@
+// Funktionen zur Änderung der Werte
+const handleChange = (setter, e, slot) => {
+  const value = e.target.value;
+  setter((prev) => {
+    const updated = [...prev];
+    updated[slot] = value;
+    return updated;
+  });
+};
+
+export default handleChange;