Refresh viewshed on band change when a point is selected

assets/js/propagation_map_hook.ts

@@ -727,6 +727,17 @@ export const PropagationMap: Record<string, unknown> & {
 
     this.handleEvent("update_band_info", ({ band_info }: { band_info: BandInfo }) => {
       this.bandInfo = band_info
+
+      // Viewshed depends on freq + score-derived range, so recompute it when
+      // the band changes if a point is still selected. update_scores already
+      // handles the heatmap, reach polygon, and detail panel refresh.
+      if (this.clickedLatLng && this.detailPanel && this.detailPanel.style.display !== "none") {
+        this.viewshedLoading = true
+        this.pushEvent("compute_viewshed", {
+          lat: this.clickedLatLng[0],
+          lon: this.clickedLatLng[1]
+        })
+      }
     })
 
     // Prevent control panel / sidebar from eating map clicks/scrolls