fix: handle matchmaking session expiry

Game/scripts/control_plane_client.gd

@@ -6,12 +6,14 @@ extends Node
 
 signal request_succeeded(operation: String, payload: Dictionary)
 signal request_failed(operation: String, http_code: int, detail: String)
+signal session_expired()
 
 const DEFAULT_BASE_URL := "http://127.0.0.1:8080"
 const PERSIST_PATH := "user://matchmaking_state.cfg"
 
 var base_url := DEFAULT_BASE_URL
 var access_token := ""
+var auth_expired := false
 var state: MatchmakingState
 var ranked_profile: RankedProfileState
 
@@ -38,6 +40,7 @@ func configure(url: String, token: String) -> bool:
 		return false
 	base_url = normalized
 	access_token = normalized_token
+	auth_expired = false
 	return true
 
 
@@ -161,8 +164,11 @@ func _on_request_completed(result: HTTPRequest.Result, response_code: int, _head
 	if response_code < 200 or response_code >= 300:
 		var detail := String(parsed.get("error", "request rejected"))
 		if response_code == HTTPClient.RESPONSE_UNAUTHORIZED:
+			access_token = ""
+			auth_expired = true
 			state.fail("Session expired; sign in again")
 			ranked_profile.set_error("Session expired; sign in again")
+			session_expired.emit()
 		elif response_code == HTTPClient.RESPONSE_GONE and operation == "queue_recover":
 			state.expire("Queue ticket expired")
 		elif response_code == HTTPClient.RESPONSE_SERVICE_UNAVAILABLE: