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/api/src/sl/sl-resources.spec.ts

@@ -18,7 +18,7 @@ describe('recursos del Service Layer', () => {
   });
 
   it('dimensiones, proyectos y cuentas son catálogos de solo lectura', () => {
-    for (const name of ['FactoringIndicators', 'DistributionRules', 'Projects', 'AdditionalExpenses', 'ItemGroups', 'BusinessPartnerGroups']) {
+    for (const name of ['FactoringIndicators', 'DistributionRules', 'Projects', 'AccountSegmentations', 'AdditionalExpenses', 'ItemGroups', 'BusinessPartnerGroups']) {
       const r = SL_RESOURCE_MAP.get(name)!;
       expect(r.methods, name).toEqual(['GET']);
       expect(r.read, name).toBeNull();