feat(web): formulario de documentos de ventas y compras (cargar, crear, actualizar con If-Match, navegar)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

apps/web/src/app/features/documents/document-screens.ts

@@ -16,6 +16,8 @@ export interface DocumentScreen {
   filters: readonly ListFilter[];
   /** Los más recientes primero. */
   orderby: string;
+  /** Formulario de documentos con socio de negocio, líneas y totales (ventas y compras). */
+  partner?: { label: string; type: 'cCustomer' | 'cSupplier'; taxResource: 'SalesTaxCodes' | 'PurchaseTaxCodes' };
 }
 
 export const menuLabel = (path: string): string =>
@@ -87,6 +89,9 @@ const marketing = (path: string, resource: string, createLabel: string, partner:
   resource,
   createLabel,
   orderby: 'DocEntry desc',
+  partner: path.startsWith('/ventas')
+    ? { label: partner, type: 'cCustomer', taxResource: 'SalesTaxCodes' }
+    : { label: partner, type: 'cSupplier', taxResource: 'PurchaseTaxCodes' },
   extraFields: ['Cancelled', 'DocTotalFc', 'DocCurrency'],
   columns: [
     docNum,