Lots of little tweaks and fixes

ui/mainmenu/MainMenu.gd

@@ -2,12 +2,14 @@ class_name MainMenu extends Control
 
 @export var btnNewGame:Button
 @export var btnSettings:Button
+@export var btnQuit:Button
 @export var settingsMenu:ClosableMenu
 @export_file("*.tscn") var newGameScene:String
 
 func _ready() -> void:
   btnNewGame.pressed.connect(onNewGamePressed)
   btnSettings.pressed.connect(onSettingsPressed)
+  btnQuit.pressed.connect(_onQuitPressed)
   settingsMenu.opened.connect(_onSettingsOpened)
   settingsMenu.closed.connect(_onSettingsClosed)
   btnNewGame.grab_focus()
@@ -26,6 +28,13 @@ func _unhandled_input(event:InputEvent) -> void:
       settingsMenu.close()
       get_viewport().set_input_as_handled()
 
+func _onQuitPressed() -> void:
+  UI.QUIT_DIALOG.closed.connect(_onQuitDialogClosed, CONNECT_ONE_SHOT)
+  UI.QUIT_DIALOG.open()
+
+func _onQuitDialogClosed() -> void:
+  btnQuit.grab_focus()
+
 func onNewGamePressed() -> void:
   SCENE.setScene(SceneSingleton.SceneType.OVERWORLD)
   OVERWORLD.mapChange(newGameScene, "PlayerSpawnPoint")