feat(web): código de cuenta con separadores de segmento, ramas vacías sin flecha y Cuenta de mayor con formato

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

apps/web/src/app/features/masters/master-form.page.ts

@@ -9,6 +9,7 @@ import { RowsTable } from '../../shared/grid/rows-table';
 import { Icon, SboWindow, Tab, Tabs, Toolbar, type StatusMessage, type WindowBadge } from '../../shared/window';
 import { updatePayload, type DocRecord } from '../documents/document-model';
 import type { HeaderField } from '../documents/document-layouts';
+import { displayCode } from './finanzas/chart-tree.model';
 import { ChartTreePanel } from './finanzas/chart-tree.panel';
 import { MasterField } from './master-field';
 import {
@@ -131,7 +132,7 @@ export class MasterFormPage {
   });
   protected readonly windowTitle = computed(() => {
     const d = this.doc();
-    const code = (this.screen.displayField && text(d?.[this.screen.displayField]).trim()) || d?.[this.screen.keyField];
+    const code = this.screen.displayField && d ? displayCode({ Code: text(d[this.screen.keyField]), FormatCode: text(d[this.screen.displayField]) }) : d?.[this.screen.keyField];
     return code === undefined ? this.screen.singular : `${this.screen.singular} · ${text(code)}`;
   });
 
@@ -178,6 +179,11 @@ export class MasterFormPage {
   }
 
   protected value(key: string): unknown {
+    // el código de una cuenta ya creada se ve con su formato (el `_SYS…` interno no es lo que el usuario conoce)
+    if (this.screen.displayField && key === this.screen.keyField && !this.isNew()) {
+      const d = this.doc();
+      return displayCode({ Code: text(d?.[this.screen.keyField]), FormatCode: text(d?.[this.screen.displayField]) });
+    }
     return this.header()[key];
   }