Function zoomBy

web/components/GraphView.tsx:772–777

(factor: number)

  }, [theme, draw]);

  const zoomBy = (factor: number) => {
    const canvas = canvasRef.current;
    const zb = zoomRef.current;
    if (!canvas || !zb) return;
    select(canvas).call(zb.scaleBy, factor);
  };

  const dark = theme === "dark";
  const pal = dark ? DARK : LIGHT;