remove hardcoded node references in favor of exported properties

scripts/globals/cursor.gd

@@ -3,12 +3,13 @@ extends CanvasLayer
 @export var _side_change_speed: float = 15
 @export var _screen_inset: float = 100
 
+@export_group("References")
+@export var _single_cursor: Control
+
 var _cursor_scene := preload("res://scenes/ui/cursor_base.tscn")
 
 var _cursors: Dictionary[int, PlayerCursor]
 
-@onready var _single_cursor: Control = $CursorBase
-
 
 func _ready() -> void:
 	Input.mouse_mode = Input.MOUSE_MODE_HIDDEN