share the world shapes both views (game and balancing) draw identically

src/balancing/CMakeLists.txt

@@ -9,6 +9,10 @@ SET(HDRS
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/ShipStatsPanel.h
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/VisualsConfig.h
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/VisualsLoader.h
+	# Shared world-space shapes so the arena keeps looking like the game
+	# (see WorldPrimitives.h). The balancing target does not link the ui library,
+	# so the few ui files it needs are compiled into it, as above.
+	${CMAKE_CURRENT_SOURCE_DIR}/../ui/WorldPrimitives.h
 	PARENT_SCOPE
 )
 
@@ -23,5 +27,6 @@ SET(SRCS
 	${CMAKE_CURRENT_SOURCE_DIR}/InspectWindow.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/ShipStatsPanel.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/../ui/VisualsLoader.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/../ui/WorldPrimitives.cpp
 	PARENT_SCOPE
 )