fix(web): el formulario de documentos dibuja los campos Sí/No (checkbox) de las extensiones

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

apps/web/src/app/features/documents/document-form.page.html

@@ -91,6 +91,14 @@
         (picked)="onPartner($event)"
       />
     }
+    @case ('checkbox') {
+      <sbo-checkbox-field
+        [label]="f.label"
+        [readonly]="readOnly() || !!f.readonly || locked(f)"
+        [value]="header()[f.key] === 'tYES'"
+        (valueChange)="setHeader(f.key, $event ? 'tYES' : 'tNO')"
+      />
+    }
     @case ('lookup') {
       <sbo-lookup-field
         [label]="f.label"