Reconcile invoice tax totals with line-level charges (assisted adjustment at liquidation)

Add an assisted check at invoice liquidation that flags when the sum of line-level tax won't match the tax calculated on the invoice subtotal, and lets you adjust the affected charge(s) before the invoice is issued. This helps invoices reconcile line-by-line with their totals in jurisdictions with zero tolerance for this kind of discrepancy — without changing how tax is calculated or rounded for anyone else.