refactor and cleanup

components/AddPOIOnPolyline.js

@@ -1,3 +1,4 @@
+// /components/AddPOIOnPolyline.js
 import React, { useState, useEffect } from "react";
 import { useDispatch, useSelector } from "react-redux";
 import { closeAddPoiOnPolylineModal } from "../redux/slices/addPoiOnPolylineSlice";
@@ -20,6 +21,7 @@ const AddPOIOnPolyline = () => {
   if (!isOpen) return null;
 
   const handleSubmit = async (event) => {
+    alert("POI auf Polyline hinzufügen");
     event.preventDefault();
 
     const formData = { name, latitude, longitude };