D3 v5
This zoomable sunburst chart visualizes the hierarchical Flare dataset, showing the size of each node through arc length and color-coded by top-level category. Clicking an arc zooms into that subtree, recomputing the partition layout and animating the transition. Built with D3 v5, it uses `d3.partition`, `d3.hierarchy`, `d3.arc`, and `transition.attrTween` to smoothly interpolate arc geometry and label positions. The visualization renders as SVG with interactive animations, and data is loaded asynchronously from the Observable `@observablehq/flare` module.