Display proration credits as line items in Order Overview and Email Receipts

I want proration credits to be clearly displayed as a distinct line item in both the Order Overview and the Email Receipts. Currently, the math doesn't add up for customers because the credit is applied to the total but not shown as a line item, leading to confusion and support requests. It is important because it ensures transparency in billing and reduces customer frustration when they see a total that doesn't match the sum of the visible line items.