feat(brandbook): anadir campo de URL de LinkedIn tambien en seccion LinkedIn B2B

src/components/BrandZone.tsx

@@ -2074,6 +2074,48 @@ export default function BrandZone({
           )}
 
           {section === 'b2b' && (
+            <div className="space-y-4">
+              <div className="rounded-xl border border-blue-200/80 bg-gradient-to-br from-blue-50/60 via-white to-sky-50/50 p-4 shadow-xs">
+                <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-3">
+                  <div className="flex-1">
+                    <label className="block text-xs font-semibold text-gray-800 mb-1">
+                      URL de la Empresa / Página en LinkedIn (o Perfil B2B)
+                    </label>
+                    <div className="flex gap-2 items-center">
+                      <input
+                        type="url"
+                        placeholder="https://www.linkedin.com/company/tu-empresa/"
+                        className="flex-1 rounded-lg border border-gray-300 bg-white px-3 py-2 text-xs text-gray-900 shadow-xs focus:border-brand-500 focus:outline-hidden focus:ring-1 focus:ring-brand-500"
+                        value={book.channel_handles.linkedin || ''}
+                        onChange={(e) =>
+                          patch({
+                            channel_handles: {
+                              ...book.channel_handles,
+                              linkedin: e.target.value,
+                            },
+                          })
+                        }
+                      />
+                      {book.channel_handles.linkedin && (
+                        <a
+                          href={book.channel_handles.linkedin}
+                          target="_blank"
+                          rel="noopener noreferrer"
+                          className="inline-flex items-center gap-1.5 px-3 py-2 text-xs font-medium text-blue-700 bg-blue-100 hover:bg-blue-200 rounded-lg transition-colors shrink-0"
+                          title="Abrir página en LinkedIn"
+                        >
+                          <ExternalLink className="w-3.5 h-3.5" />
+                          <span>Abrir</span>
+                        </a>
+                      )}
+                    </div>
+                    <p className="mt-1 text-[11px] text-gray-500">
+                      Este campo está sincronizado en tiempo real con la pestaña <strong>Canales</strong> (`channel_handles.linkedin`).
+                    </p>
+                  </div>
+                </div>
+              </div>
+
               <div className="grid gap-3 sm:grid-cols-2">
                 <Field label="Temas LinkedIn">
                   <textarea
@@ -2137,6 +2179,7 @@ export default function BrandZone({
                   />
                 </Field>
               </div>
+            </div>
           )}
 
           {section === 'blog' && (