refactor: clarify frontend module ownership

src/features/auth/model/auth-context.ts

@@ -7,6 +7,7 @@ type AuthContextValue = {
 	logout: () => Promise<void>;
 	ready: boolean;
 	register: (email: string, password: string) => Promise<void>;
+	signedOut: boolean;
 	user: undefined | User;
 };