fix(join): increase join_world timeout, log dedicated server stdout/stderr, null check multiplayer

scripts/api_client.gd

@@ -139,10 +139,11 @@ func request(
 	body: String = "",
 	content_type: String = "application/json",
 	require_auth: bool = false,
-	custom_headers: PackedStringArray = PackedStringArray()
+	custom_headers: PackedStringArray = PackedStringArray(),
+	custom_timeout: float = 0.0
 ) -> Dictionary:
 	var http := HTTPRequest.new()
-	http.timeout = timeout_seconds
+	http.timeout = custom_timeout if custom_timeout > 0.0 else timeout_seconds
 	http.max_redirects = 8
 	http.accept_gzip = true
 	add_child(http)
@@ -268,7 +269,7 @@ func get_avatar_loadout() -> Dictionary:
 ## its address. On success result.data is {"world_id", "host", "port"}.
 ## 503 if this backend has no game-server orchestration.
 func join_world(world_id: int) -> Dictionary:
-	return await request(HTTPClient.METHOD_POST, "/api/worlds/%d/join" % world_id, "", "application/json", true)
+	return await request(HTTPClient.METHOD_POST, "/api/worlds/%d/join" % world_id, "", "application/json", true, PackedStringArray(), 25.0)
 
 
 ## Save (replace) the current user's avatar loadout (requires auth).

scripts/network_client.gd

@@ -107,7 +107,8 @@ func disconnect_from_server() -> void:
 		peer.close()
 	if _server_root and is_instance_valid(_server_root):
 		_server_root.queue_free()
-	multiplayer.multiplayer_peer = null
+	if multiplayer:
+		multiplayer.multiplayer_peer = null
 	_prediction_buffer.clear()
 	_remote_states.clear()