D3 v5 Zoomable Sunburst
This zoomable sunburst visualizes the hierarchical structure of the Flare dataset, showing nested categories as concentric arcs. Clicking an arc zooms into that subtree, smoothly animating the radial layout over two seconds. Built with D3 v5, it uses `d3.partition`, `d3.hierarchy`, and `d3.arc` to compute geometry, while `d3.interpolate` and `transition.attrTween` animate the paths and labels. Color assignment uses `d3.scaleOrdinal` with `d3.interpolateRainbow`. The visualization renders as SVG, with tooltips displaying the full path and formatted values.