refactor: switch from maplibregl to Leaflet

Co-authored-by: aider (ollama/qwen2.5-coder:32b) <aider@aider.chat>

js/main.js

@@ -12,15 +12,13 @@ document.addEventListener('DOMContentLoaded', function() {
   window.isCreatingJourney = true;
 
   // Initialize the map
-  const map = new maplibregl.Map({
-    container: 'map',
-    style: 'https://api.maplibre.org/style.json?access_token=your_maplibre_access_token',
-    center: [8.5, 47.3],
-    zoom: 10
-  });
+  const map = L.map('map').setView([8.5, 47.3], 10);
+  L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
+    attribution: '© OpenStreetMap contributors'
+  }).addTo(map);
 
   // Add navigation controls
-  map.addControl(new maplibregl.NavigationControl());
+  L.control.scale().addTo(map);
 
   // Add geolocate control
   map.addControl(new maplibregl.GeolocateControl({