feat(rover): clear selected candidate + path lines on recalculate

assets/js/rover_map_hook.ts

@@ -276,7 +276,16 @@ export const RoverMap: Partial<RoverMapHook> = {
       }
     ) => {
       this.candidatePathLayer.clearLayers()
-      if (!candidate || !paths || paths.length === 0) return
+
+      if (!candidate) {
+        if (this.selectedCandidateMarker) {
+          this.map.removeLayer(this.selectedCandidateMarker)
+          this.selectedCandidateMarker = null
+        }
+        return
+      }
+
+      if (!paths || paths.length === 0) return
 
       for (const p of paths) {
         L.polyline(

lib/microwaveprop_web/live/rover_live.ex

@@ -320,6 +320,7 @@ defmodule MicrowavepropWeb.RoverLive do
      socket
      |> assign(top_candidates: cands, selected_candidate: nil, scoring_loading: false)
      |> apply_scoring_warnings(warnings)
+     |> push_event("candidate_paths", %{candidate: nil, paths: []})
      |> push_event("rover_results", %{
        cells: cells,
        drive_radius_km: socket.assigns.drive_radius_km