Parent button components (EditVendorButton, EditAccountButton, etc.) stay
mounted even when their AdminDialog closes — so pending was never cleared
on success, causing buttons to show 'Saving...' on the next open. The
payment confirm button (no dialog) was stuck in 'Confirming...' until the
page re-render eventually unmounted it. Added setPending(false) before
setOpen/router.refresh in every success path.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Allow accounts to record partial/advance payments against a PO before
full delivery. A new PARTIALLY_PAID status tracks in-progress payment;
paidAmount accumulates across multiple markPaid calls. PO only closes
when both paidAmount >= totalAmount AND all line items are delivered.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
