D3 v5 Zoomable Sunburst
This zoomable sunburst visualization displays the hierarchical structure of the Flare dataset, showing parent-child relationships and relative sizes through concentric arcs. Built with D3 v5, it uses `d3.partition` to compute the layout, `d3.arc` for path generation, and `d3.scaleOrdinal` with an interpolated rainbow palette for coloring. Clicking any node triggers an animated transition via `transition.attrTween` and `transition.attr`, zooming to that subtree while labels adjust their rotation and opacity based on visibility thresholds. The dataset loads from the `@observablehq/flares` package, and all rendering is done in SVG.