Refactor message bus and lobby networking flow

* Add local message bus emission with optional argument expansion
* Improve message type validation and callback dispatch
* Simplify lobby match join/disconnect handling
* Move lobby server networking toward an overridable `ServerNetworking` base class
* Update lobby scene to use the dedicated lobby server script
* Remove obsolete window configuration and unused RPC stubs

scenes/data_bridge/lobby_data.gd

@@ -81,6 +81,14 @@ func match_list_remove_entry(match_id: String) -> void:
 	_delete_from_match_pool(match_id)
 
 func match_list_join_entry(match_id: String) -> void:
+	if active_match_pool.has(match_id):
+		push_error("Client Joining Match List Entry Failed. Already consumed. ", match_id)
+
+		# TODO: Need to signal to prospective client that match has been taken.
+		#       Server is in the midst of cleanup for it once clients disconnect
+		#       to join generated game server...
+		return
+
 	var match_entry     = match_pool.get(match_id)
 	if not match_entry: return
 
@@ -100,22 +108,14 @@ func match_list_join_entry(match_id: String) -> void:
 	client2.partner_id  = client1.id
 
 	active_match_pool[match_id] = match_entry
+	# NOTE: Cleanup of match info and client info
+	#       will/should happen on their disconnect...
 
-	client_pool.erase(client1.id)
-	client_pool.erase(client2.id)
-
+	# TODO: Need to look into moving this out of here.
+	#       Maybe just have clients drop and internally call on their own?
+	#       Maybe just check here if we can even launch the game server?
 	_launch_game_server(match_entry, client1, client2)
 
-# NOTE: Needed for hash check to pass between client and server but isn't used by server...
-@rpc("authority", "reliable")
-func connect_to_game() -> void:
-	pass
-
-@rpc("authority", "reliable")
-func go_back_to_match_screen() -> void:
-	pass
-
-
 func server_client_connected(id: int) -> void:
 	push_warning("Client Connected... ID: ", id)
 
@@ -134,32 +134,29 @@ func server_client_disconnected(id: int) -> void:
 	push_warning("Client Disconnected... ID: ", id)
 
 	var client1     = client_pool.get(id)
-	if not client1: return
+	if not client1:     return
 
-	var client2     = client_pool.get( client1.partner_id )
 	var match_entry = _delete_from_match_pool(client1.match_id)
+	if not match_entry: return
 
-	if not client1.match_id.is_empty() and not match_entry.is_empty():
-		MessageBus.emit_propagation(
-			"match_list_remove_entry", match_entry.match_id
-		)
+	push_warning("Removing Match... Match: ", match_entry)
 
-		for client in client_pool.values():
-			if client.in_match: continue
-			if client.id == id: continue
+	MessageBus.emit_local(
+		"match_list_remove_entry", match_entry.match_id
+	)
 
-			MessageBus.emit_propagation_clients_only.rpc_id(
-				client.id, "match_list_remove_entry", match_entry.match_id
-			)
-
-		match_pool.erase(client1.match_id)
+	MessageBus.emit_propagation_clients_only.rpc(
+		"match_list_remove_entry", match_entry.match_id
+	)
 
 	client_pool.erase(client1.id)
-	if not client2: return
 
-	if active_match_pool.get(client2.match_id):
-		match_pool.erase(client2.match_id)
 
-	var _id    = client2.id
-	client2    = CLIENT_DICT.duplicate_deep()
-	client2.id = _id
+# NOTE: Needed for hash check to pass between client and server but isn't used by server...
+@rpc("authority", "reliable")
+func connect_to_game() -> void:
+	pass
+
+@rpc("authority", "reliable")
+func go_back_to_match_screen() -> void:
+	pass

scenes/screens/lobby_screen/lobby.gd

@@ -56,12 +56,8 @@ func _on_match_list_entry_removed(match_id: String) -> void:
 		match_entry.queue_free()
 
 func _on_match_list_join_entry(match_id: String) -> void:
-	Globals.lobby_data.match_list_join_entry(match_id)
 	push_warning("Client Joining Match List Entry... ", match_id)
-
-	if Globals.lobby_data.match_pool.has(match_id): return
-
-	_on_match_list_entry_removed(match_id)
+	Globals.lobby_data.match_list_join_entry(match_id)
 
 func _create_match_entry(match_entry: Dictionary) -> void:
 	var container = MATCH_ENTRY.instantiate()

scenes/screens/lobby_screen/lobby.tscn

@@ -3,7 +3,7 @@
 [ext_resource type="Script" uid="uid://dk7afnf7ol7dy" path="res://scenes/screens/lobby_screen/lobby.gd" id="1_hhiik"]
 [ext_resource type="PackedScene" uid="uid://rb6av5eg4u0" path="res://scenes/ui_controls/lobby_screen/lobby_ui.tscn" id="2_lqt48"]
 [ext_resource type="Script" uid="uid://6sfwe1hwgf0g" path="res://scenes/screens/lobby_screen/lobby_rpc.gd" id="3_rurl6"]
-[ext_resource type="Script" uid="uid://bvqtgf3vbsoj4" path="res://scripts/server_networking.gd" id="4_glu7g"]
+[ext_resource type="Script" uid="uid://crbm3v4td6du6" path="res://scenes/screens/lobby_screen/lobby_server.gd" id="4_glu7g"]
 
 [node name="lobby_screen" type="Control"]
 layout_mode = 3

scenes/screens/lobby_screen/lobby_server.gd

@@ -0,0 +1,19 @@
+class_name Lobbyserver extends ServerNetworking
+
+
+func _ready() -> void:
+	pass
+
+func _process(_delta: float) -> void:
+	pass
+
+
+func server_client_connected(id: int) -> void:
+	Globals.lobby_data.server_client_connected(id)
+
+func server_client_disconnected(id: int) -> void:
+	# NOTE: Wait for clients to fully disconnect...
+	var timer = get_tree().create_timer(1)
+	await timer.timeout
+
+	Globals.lobby_data.server_client_disconnected(id)

scenes/screens/lobby_screen/lobby_server.gd.uid

@@ -0,0 +1 @@
+uid://crbm3v4td6du6