Render bathymetric sonar surface

game/presentation/sonar/sonar_display.gd

@@ -53,6 +53,18 @@ func built_row_count() -> int:
 	return _renderer.built_row_count()
 
 
+func built_triangle_count() -> int:
+	return _renderer.built_triangle_count()
+
+
+func built_grid_segment_count() -> int:
+	return _renderer.built_grid_segment_count()
+
+
+func idle_prompt_visible() -> bool:
+	return _renderer.idle_prompt_visible()
+
+
 func status_text() -> String:
 	return _status_label.text