Fix: Karten-Pin-Setzen erfordert Login — Weiterleitung zu Welcome

SW by-v573, APP_VER 550

backend/static/js/pages/map.js

@@ -807,6 +807,7 @@ window.Page_map = (() => {
   // Marker setzen (Placement-Mode)
   // ----------------------------------------------------------
   function _togglePlacementMode() {
+    if (!_appState?.user) { App.navigate('welcome'); return; }
     _placingMarker = !_placingMarker;
     const btn = document.getElementById('map-pin-btn');
     if (_placingMarker) {