feat: Implement Tekton Doors game mode with portal mechanics, add an in-game message bar, and introduce a pre-game countdown.

scenes/player.gd

@@ -82,6 +82,7 @@ var is_player_moving: bool = false:
 	set(value): if movement_manager: movement_manager.is_moving = value
 
 var _verify_timer: float = 0.0
+var _movement_tween: Tween = null
 var can_finish: bool:
 	get: return race_manager.can_finish if race_manager else false
 	set(value): if race_manager: race_manager.can_finish = value
@@ -1307,9 +1308,11 @@ func start_movement_along_path(path: Array, clear_visual: bool = true):
 	if global_position.distance_squared_to(start_world_pos) > 0.001:
 		global_position = start_world_pos
 	
-	var tween = create_tween()
-	tween.set_trans(Tween.TRANS_LINEAR)
-	tween.set_ease(Tween.EASE_IN_OUT)
+	if _movement_tween:
+		_movement_tween.kill()
+	_movement_tween = create_tween()
+	_movement_tween.set_trans(Tween.TRANS_LINEAR)
+	_movement_tween.set_ease(Tween.EASE_IN_OUT)
 
 	var step_duration = 0.25
 	if movement_manager:
@@ -1317,12 +1320,13 @@ func start_movement_along_path(path: Array, clear_visual: bool = true):
 
 	for point in path:
 		# Use global_position for consistency
-		tween.tween_property(self , "global_position", grid_to_world(Vector2i(point.x, point.y)), step_duration)
+		_movement_tween.tween_property(self , "global_position", grid_to_world(Vector2i(point.x, point.y)), step_duration)
 
-	tween.tween_callback(func():
+	_movement_tween.tween_callback(func():
 		var old_pos = current_position
 		current_position = Vector2i(path[-1].x, path[-1].y)
 		is_player_moving = false
+		_movement_tween = null
 		target_position = Vector2i(-1, -1)
 		
 		print("[Player] %s finished move. %s -> %s" % [name, old_pos, current_position])
@@ -1937,6 +1941,11 @@ func set_spawn_position(pos: Vector2i):
 	
 	print("[Player %s] set_spawn_position: Grid %s -> World %s (CellSize: %s)" % [name, pos, new_pos, cell_size])
 	
+	if _movement_tween:
+		_movement_tween.kill()
+		_movement_tween = null
+		is_player_moving = false
+	
 	global_position = new_pos
 	target_visual_position = new_pos