feat: add operation for cycling crosswalk tags

modules/operations/cycle_highway_tag.js

@@ -43,6 +43,9 @@ export function operationCycleHighwayTag(context, selectedIDs) {
     'highway/footway/crossing/ladder:skewed',
   ];
 
+  // Do not allow multi-select.
+  if (selectedIDs.length > 1) return false;
+
   const selectedID = selectedIDs[0];
   const entity = graph.hasEntity(selectedID);