ajustes: contagem de mensagens no historico

src/composables/useChat.js

@@ -71,7 +71,7 @@ export function useChat() {
       title: c.Title || "Nova conversa",
       createdAt: new Date(c.CreatedAt).getTime(),
       updatedAt: new Date(c.UpdatedAt).getTime(),
-      messageCount: 0
+      messageCount: Number(c.MessageCount ?? 0)
     };
   }