feat: conversacion unificada estilo Freshdesk en ticket (comentarios + correos con cuerpo)

frontend/src/lib/api.ts

@@ -140,6 +140,7 @@ export interface TicketSentEmail {
   subject: string;
   status: string;
   error?: string;
+  body?: string;
   createdAt: string;
 }
 
@@ -149,6 +150,8 @@ export interface TicketReceivedEmail {
   subject: string;
   status: string;
   error?: string;
+  body?: string;
+  commentId?: number;
   createdAt: string;
 }