UI improvements

ui/UISingleton.gd

@@ -1,7 +1,10 @@
 extends Node
 
+const _FocusStackScript = preload("res://ui/UIFocusStack.gd")
+
 var rootUi:RootUI = null
 var interactIndicator:InteractIndicator = null
+var FOCUS_STACK:RefCounted = null
 
 # True whenever any dialogue resource is being processed by DialogueManager.
 # Driven by DialogueManager.dialogue_started / dialogue_ended signals.
@@ -11,6 +14,7 @@ var dialogueActive:bool = false
 var activeConversation:bool = false
 
 func _ready() -> void:
+  FOCUS_STACK = _FocusStackScript.new()
   DialogueManager.dialogue_started.connect(_onDialogueStarted)
   DialogueManager.dialogue_ended.connect(_onDialogueEnded)
   SCENE.sceneChanged.connect(_onSceneChanged)