Gradient from categories

<Plot color={{ scheme }} grid>
    <defs>
        <LinearGradientX id="my-gradient" {stops} />
    </defs>
    <Line
        {data}
        x="x"
        y="y"
        strokeWidth={2}
        stroke="url(#my-gradient)" />
    <Dot
        {data}
        x="x"
        y="y"
        fill="category"
        r={4}
        stroke="var(--svelteplot-bg)" />
</Plot>