it("should throw error if Resend API fails", async () => {
    // Arrange
    const mockResendResponse: ResendEmailResponse = {
      data: null,
      error: {
        message: "Failed to send email",
        name: "invalid_parameter",
      },
    };
    vi.mocked(resend.emails.send).mockResolvedValue(mockResendResponse);

    // Act & Assert
    await expect(sendInvitationEmail(mockEmailData)).rejects.toThrow("Failed to send invitation email");
  });

tests/unit/lib/email/index.test.ts:499:53 - error TS2345: Argument of type 'ResendEmailResponse' is not assignable to parameter of type 'CreateEmailResponse'.
  Type 'ResendEmailResponse' is not assignable to type '{ data: null; error: ErrorResponse; }'.
    Types of property 'data' are incompatible.
      Type '{ id: string; } | null' is not assignable to type 'null'.
        Type '{ id: string; }' is not assignable to type 'null'.

499     vi.mocked(resend.emails.send).mockResolvedValue(mockResendResponse);