A scheduled invoice's issue_date was stamped at creation, so a long-
scheduled invoice printed a stale date by the time it shipped — the
relative Skonto window ("pay within N working days") and the net-days
due date were then counted from the authoring day, not the send day.
sendInvoice now stamps issue_date = send date on the first send and
re-derives the due date from it, preserving a manual due-date override.
Adds resolveNetDaysForRow to read net days from the persisted snapshot.
Deselecting Skonto before the scheduled send already propagates (the
scheduler re-reads the row fresh and the render context honours
skonto_disabled); no change needed there.
Luca
45c7cc80ab