Account Payment View Check Number

This module extends the Vendor Payments list view in the Accounting app. It adds a new column showing the check number for each payment, placed right after the payment method column.

• The column is hidden by default (optional), so users can switch it on from the list's column selector when they need it.
• It only affects the list of vendor payments; no new menus, buttons, reports or business rules are added.
• The check number value itself comes from the standard check printing feature, which this module depends on.

In practice, accountants and finance users who pay vendors by check can now scan the payments list and immediately see which check number was used for each payment, without opening each record individually. The module touches the account.payment model's list view only.