fix(rover-locations): use circleMarker; default marker icons aren't bundled

assets/js/location_map_hook.ts

@@ -2,7 +2,7 @@ import type { ViewHook } from "phoenix_live_view"
 
 interface LocationMapHook extends ViewHook {
   map: L.Map
-  marker: L.Marker
+  marker: L.CircleMarker
   visibilityHandler: (() => void) | null
 }
 
@@ -38,7 +38,14 @@ export const LocationMap: Partial<LocationMapHook> = {
       { position: "topright", collapsed: false }
     ).addTo(map)
 
-    this.marker = L.marker([lat, lon]).addTo(map)
+    this.marker = L.circleMarker([lat, lon], {
+      radius: 8,
+      color: "#ffffff",
+      weight: 2,
+      fillColor: "#ef4444",
+      fillOpacity: 0.95,
+      pane: "markerPane"
+    }).addTo(map)
     this.marker.bindPopup(`${lat.toFixed(6)}, ${lon.toFixed(6)}`)
 
     // LiveView reconnect / tab visibility — Leaflet needs invalidateSize.