Reset desktop chat unread badge when opened

apps/desktop/src/chat/ChatWidget.tsx

@@ -107,6 +107,7 @@ export function ChatWidget({ ticketId, ticketRef }: ChatWidgetProps) {
         const unreadIds = payload.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)
         }
       },
       (err) => {
@@ -218,6 +219,7 @@ export function ChatWidget({ ticketId, ticketRef }: ChatWidgetProps) {
 
   const handleExpand = async () => {
     setIsMinimized(false)
+    setUnreadCount(0)
     try {
       await invoke("set_chat_minimized", { ticketId, minimized: false })
     } catch (err) {