Add simulated CCS computer

scripts/ui/main.gd

@@ -699,6 +699,9 @@ func _input(event: InputEvent) -> void:
 	if not AuthState.is_logged_in or current_screen_name == "login":
 		return
 	if event.is_action_pressed("ui_cancel"):
+		if _close_current_transient_overlay():
+			get_viewport().set_input_as_handled()
+			return
 		if drawer_open:
 			_close_drawer()
 			get_viewport().set_input_as_handled()
@@ -708,6 +711,13 @@ func _input(event: InputEvent) -> void:
 			get_viewport().set_input_as_handled()
 
 
+func _close_current_transient_overlay() -> bool:
+	var screen: Control = screens.get(current_screen_name)
+	if screen != null and screen.has_method("close_transient_overlay"):
+		return bool(screen.close_transient_overlay())
+	return false
+
+
 func _screen_uses_pause_menu(screen_name: String) -> bool:
 	return screen_name in ["player", "ccs_player", "ccs_cases_2", "flashcards_study"]