feat(checkout): add error handling for expired purchases in checkout process

src/app/shared/components/cart/cart.component.html

@@ -9,17 +9,17 @@
       @if (
         allowModify() &&
         (!readonly() || showModifyWhenReadonly()) &&
-        requireEditingMode() &&
+        (requireEditingMode() || modifyAsAction()) &&
         items().length > 0
       ) {
         <button
           class="btn btn-link p-0 border-0 cart-edit-btn"
           type="button"
-          [attr.aria-pressed]="editing()"
+          [attr.aria-pressed]="modifyAsAction() ? null : editing()"
           [disabled]="editingDisabled()"
           (click)="toggleEditing()"
         >
-          {{ editing() ? 'Listo' : 'Modificar' }}
+          {{ !modifyAsAction() && editing() ? 'Listo' : 'Modificar' }}
         </button>
       }