Add 45px spacing to Leaflet attribution

Add margin-bottom of 45px and margin-left of 10px to ensure the Leaflet
attribution has proper spacing from the bottom navbar and left edge.

Author: claude

css/catchment.css

@@ -251,6 +251,12 @@ body {
     margin-top: 60px;
 }
 
+/* Ensure Leaflet attribution has proper spacing */
+.leaflet-bottom.leaflet-left {
+    margin-bottom: 45px;
+    margin-left: 10px;
+}
+
 /* Better popup styling */
 .leaflet-popup-content {
     margin: 13px 19px;