Separate route and recent imagery acquisition from application assembly

src/app/layers/directions.js

@@ -1,12 +1,6 @@
 import { createApplicationDirectionsLayer } from '../../data/directions.js';
 
-/**
- * Construct one Directions layer using the application scene owners.
- *
- * It takes no data source: a route is fetched from `/api/route` when the
- * operator places both endpoints, so there is nothing to supply up front.
- * @returns {object} A fresh layer instance for this catalog.
- */
-export function createApplicationDirections() {
-  return createApplicationDirectionsLayer();
+/** Construct Directions with application scene owners and an explicit route source. */
+export function createApplicationDirections({ source }) {
+  return createApplicationDirectionsLayer({ source });
 }