removed circles in sidebar legend, added contribution icon in layer control

public/js/app.js

@@ -324,8 +324,7 @@ function loadContributions() {
             onEachFeature: bindFeaturePopup
         }).addTo(map);
 
-        layerControl.addOverlay(contributionsLayer, 'Beiträge');
-
+        layerControl.addOverlay(contributionsLayer, '<i class="fa-solid fa-map-pin" style="color:#546E7A;"></i> Beiträge');
         // Update Sidebar List and Statistics
         updateContributionsList();
         updateStatistics();
@@ -719,7 +718,6 @@ function buildCategoryFilter() {
         html += '' +
             '<label style="display:flex;align-items:center;gap:8px;margin-bottom:6px;cursor:pointer;">' +
                 '<input type="checkbox" value="' + key + '" ' + checked + ' onchange="toggleCategoryFilter(this)">' +
-                '<span style="display:inline-block;width:12px;height:12px;border-radius:50%;background:' + cat.color + ';"></span>' +
                 '<span>' + categoryIcon(cat) + ' ' + cat.label + '</span>' +
             '</label>';
     }