feat: allow custom QR login output

client.go

@@ -36,6 +36,17 @@ func WithHTTPClient(httpClient *http.Client) Option {
 	}
 }
 
+// WithQRWriter configures where QR login output is written.
+func WithQRWriter(writer io.Writer) Option {
+	return func(client *Client) error {
+		if writer == nil {
+			return fmt.Errorf("QR writer must not be nil")
+		}
+		client.qrWriter = writer
+		return nil
+	}
+}
+
 type Client struct {
 	authPath        string
 	authMu          sync.RWMutex