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

scenes/lobby.gd

@@ -149,6 +149,7 @@ func _ready():
 	
 	if game_mode_option:
 		game_mode_option.item_selected.connect(_on_game_mode_selected)
+		_setup_game_modes()
 	
 	# Connect LobbyManager signals
 	LobbyManager.room_list_updated.connect(_on_room_list_updated)
@@ -212,6 +213,18 @@ func _on_server_ip_submitted(new_text: String) -> void:
 	if server_option and server_option.selected == 1:
 		NakamaManager.set_server(new_text.strip_edges())
 
+func _setup_game_modes() -> void:
+	if not game_mode_option: return
+	game_mode_option.clear()
+	for mode in LobbyManager.available_game_modes:
+		game_mode_option.add_item(mode)
+	
+	# Select current mode
+	for i in range(game_mode_option.item_count):
+		if game_mode_option.get_item_text(i) == LobbyManager.game_mode:
+			game_mode_option.selected = i
+			break
+
 func _setup_player_slots() -> void:
 	"""Get references to all player slot nodes."""
 	player_slots.clear()