refactor: decouple game networking from lobby client

* Replace direct client/server networking references with GameClient/GameServer scenes
* Refactor message bus to support local emission and argument expansion
* Move lobby connection lifecycle handling to message bus events
* Remove multiplayer connection wait helpers and direct lobby client coupling
* Rename Server to ServerNetworking and update lobby client references
* Update scene resources and export configuration

scenes/screens/lobby_screen/lobby_client.gd

@@ -0,0 +1,35 @@
+class_name LobbyClient extends ClientNetworking
+
+
+var lobby_fully_connected: bool = false
+
+
+func _ready() -> void:
+	pass
+
+func _process(_delta: float) -> void:
+	pass
+
+func _do_wait_for_connection() -> void:
+	_wait_for_connection()
+
+	while not lobby_fully_connected:
+		await get_tree().process_frame
+
+func _do_wait_close_connection():
+	_wait_close_connection()
+
+	lobby_fully_connected = false
+
+
+func client_connected_to_server() -> void:
+	push_warning("Connected to server!")
+
+
+func client_disconnected_from_server() -> void:
+	push_warning("Disconnected from, server...")
+
+func client_connection_failed_to_server() -> void:
+	push_warning("Connection failed!")
+
+	unset_client()