Billing Module: Display Date, Hours, and Rate per Entry

Clients need the ability to show detailed billing data for transparency, including the date, hours worked, and rate per entry. This should support different rate types and amounts, and ideally, allow auto-adding these line items to invoices in one click (similar to how Xero handles it).

Currently, the billing module doesn’t provide enough transparency for clients, so some users are using external tools like Xero. Adding this functionality would make the billing module more usable and reduce dependency on external accounting tools.