add PTY handler

main.go

@@ -225,6 +225,15 @@ func main() {
 }
 
 func teaHandler(s ssh.Session) (tea.Model, []tea.ProgramOption) {
+	// Check if PTY is available
+	ptyReq, _, _ := s.Pty()
+	if ptyReq.Term == "" {
+		// No PTY, handle as command execution
+		s.Write([]byte("This server requires an interactive terminal (PTY).\nPlease connect with: ssh -t user@host\n"))
+		s.Exit(1)
+		return nil, nil
+	}
+
 	return model{
 		showWelcome: true,
 		focus:       0,