Edit Invoice Number Per Invoice

Let users edit the invoice number on individual invoices, not just set a starting number for the workspace. Useful when migrating from another invoicing system that has gaps in the sequence, when matching invoice numbers to an external numbering scheme (e.g. QuickBooks Desktop), or when an invoice needs to be reissued with a specific number.

Today the starting invoice number can be set, but individual invoices follow the auto-incremented sequence without an option to override.