v4.3.0 - Sticky header, sun/moon positions, red night mode

feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapScreen.kt

@@ -297,6 +297,8 @@ private fun setPositions(
             lastMapView = mapView
             markerPool.clear()
             iconCache.evictAll()
+            footprintPolyline = null
+            footprintPoints = null
         }
         // Reuse the existing FolderOverlay — creating a new one and replacing it
         // causes osmdroid to detach shared Marker objects, making them invisible.