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

game_client.gd

@@ -0,0 +1,35 @@
+class_name GameClient extends ClientNetworking
+
+
+func _ready() -> void:
+	setup_signals()
+
+
+func setup_signals() -> void:
+	MessageBus.subscribe("game_start_client", _start_client)
+
+	MessageBus.subscribe("game_wait_for_connection", _wait_for_connection)
+	MessageBus.subscribe("game_close_connection", _wait_close_connection)
+
+func _start_client(address: String = "127.0.0.1", port: int = 8080) -> void:
+	if peer: return
+	start_client(address, port)
+
+
+func client_connected_to_server() -> void:
+	push_warning("Connected to server!")
+
+func close_connection() -> void:
+	if not peer: return
+
+	push_warning("Disconnected from, server...")
+
+	unset_client()
+
+func client_disconnected_from_server() -> void:
+	push_warning("Disconnected from, server...")
+
+func client_connection_failed_to_server() -> void:
+	push_warning("Connection failed!")
+
+	unset_client()