feature/AB#30415 - Modular Applicant Permissions - #2870

                @if (true || await PermissionChecker.IsGrantedAsync(UnitySelector.ApplicantManagement.History.Default))

                <zone-fieldset id="PrimaryMailingAddress" class="row m-0 mailing-address-form ps-2" style="border-bottom:none;">

    [RemoteService(true)]
    [Authorize]
    public async Task UpdateApplicantIdAsync(UpdateApplicantIdDto dto)
    {
        // Validate input
        if (dto == null)
        {
            Logger.LogWarning("UpdateApplicantIdAsync called with null dto.");
            return;
        }

        //Update Application
        var application = await applicationRepository.GetAsync(dto.ApplicationId);
        if (application == null)
        {
            Logger.LogWarning("Application not found for ApplicationId: {ApplicationId}", dto.ApplicationId);
            return;
        }

        var oldApplicantId = application.ApplicantId;
        if (oldApplicantId == dto.ApplicantId)
        {
            Logger.LogInformation("ApplicantId is already set to the requested value. No update required.");
            return;
        }

        application.ApplicantId = dto.ApplicantId;
        await applicationRepository.UpdateAsync(application);

        //Update ApplicationFormSubmissions
        await UpdateApplicationFormSubmissionsAsync(dto.ApplicationId, dto.ApplicantId);

        //Update ApplicantAgent records
        await UpdateApplicantAgentRecordsAsync(oldApplicantId, dto.ApplicantId, dto.ApplicationId);

        //Update ApplicantAddresses records
        await UpdateApplicantAddressRecords(oldApplicantId, dto.ApplicantId, dto.ApplicationId);
    }