feat(respuesta): elegir marca, el botón ejecuta

frontend/src/app/(app)/tickets/[id]/page.tsx

@@ -241,9 +241,9 @@ export default function TicketDetailPage() {
   };
 
   const chooseSendAction = (action: "send" | "resolved" | "closed") => {
+    // Solo marca la opción; se ejecuta al presionar el botón.
     setSendAction(action);
     setSendMenuOpen(false);
-    void submitComment(action === "send" ? undefined : action);
   };
 
   useEffect(() => {
@@ -846,14 +846,13 @@ export default function TicketDetailPage() {
                   </label>
                 </div>
                 {isTeam ? (
-                  <div className="position-relative">
+                  <div className="btn-group" role="group" aria-label="Opciones de envío">
                     <button
                       type="button"
                       className="btn btn-primary"
                       disabled={!comment.trim() || submitting}
-                      aria-label="Opciones de envío"
+                      title={`Enviar con: ${SEND_ACTIONS[sendAction].label}`}
-                      aria-expanded={sendMenuOpen}
+                      onClick={() => void submitComment(sendAction === "send" ? undefined : sendAction)}
-                      onClick={() => setSendMenuOpen((o) => !o)}
                     >
                       {submitting ? (
                         <span className="spinner-border spinner-border-sm" role="status"></span>
@@ -863,7 +862,16 @@ export default function TicketDetailPage() {
                           {SEND_ACTIONS[sendAction].label}
                         </>
                       )}
-                      <i className="bi bi-chevron-down ms-2"></i>
+                    </button>
+                    <button
+                      type="button"
+                      className="btn btn-primary dropdown-toggle dropdown-toggle-split"
+                      disabled={!comment.trim() || submitting}
+                      aria-label="Elegir modo de envío"
+                      aria-expanded={sendMenuOpen}
+                      onClick={() => setSendMenuOpen((o) => !o)}
+                    >
+                      <span className="visually-hidden">Elegir</span>
                     </button>
                     {sendMenuOpen && (
                       <>