diff --git a/apps/desktop/src/chat/ChatWidget.tsx b/apps/desktop/src/chat/ChatWidget.tsx
index 8441c0d..aaa5c9a 100644
--- a/apps/desktop/src/chat/ChatWidget.tsx
+++ b/apps/desktop/src/chat/ChatWidget.tsx
@@ -127,6 +127,28 @@ export function ChatWidget({ ticketId, ticketRef }: ChatWidgetProps) {
     }
   }, [ticketId, isMinimized])
 
+  // Sincroniza estado de minimizado com o tamanho da janela (Tauri pode alterar por fora)
+  useEffect(() => {
+    const handler = () => {
+      const h = window.innerHeight
+      // thresholds alinhados com set_chat_minimized (52px minimizado, 520px expandido)
+      setIsMinimized(h < 100)
+    }
+    window.addEventListener("resize", handler)
+    handler()
+    return () => window.removeEventListener("resize", handler)
+  }, [])
+
+  // Quando expandir, marcar mensagens como lidas e limpar badge
+  useEffect(() => {
+    if (isMinimized) return
+    const unreadIds = messages.filter(m => !m.isFromMachine).map(m => m.id as string)
+    if (unreadIds.length > 0) {
+      markMachineMessagesRead(ticketId, unreadIds).catch(err => console.error("mark read falhou", err))
+    }
+    setUnreadCount(0)
+  }, [isMinimized, messages, ticketId])
+
   // Selecionar arquivo para anexar
   const handleAttach = async () => {
     if (isUploading || isSending) return
@@ -231,10 +253,8 @@ export function ChatWidget({ ticketId, ticketRef }: ChatWidgetProps) {
     const unreadIds = messages.filter(m => !m.isFromMachine).map(m => m.id as string)
     if (unreadIds.length > 0) {
       markMachineMessagesRead(ticketId, unreadIds).catch(err => console.error("mark read falhou", err))
-      setUnreadCount(0)
-    } else {
-      setUnreadCount(0)
     }
+    setUnreadCount(0)
   }
 
   const handleClose = () => {