Add error page for when a session has been taken

Describe to the user what it means when a session has been detected as
taken and provide a means to abandoned the session and log in again.

server/utils/session.ts

@@ -106,6 +106,7 @@ export async function getServerSession(event: H3Event, ignoreExpired: boolean) {
 					statusCode: 403,
 					statusMessage: "Forbidden",
 					message: "Session has been taken by another agent.",
+					data: { code: "SESSION_TAKEN" },
 				});
 			}
 			const now = Date.now();