D3 v5 Zoomable Sunburst
A zoomable sunburst diagram displays hierarchical data from the Flare dataset, using nested arcs to show relative values. The D3 v5 example implements interactive click-to-zoom transitions with `d3.partition`, `d3.arc`, and `d3.hierarchy`. SVG elements and animated `transition.attrTween` calls adjust arc angles and radii, while color encoding and labels update dynamically based on the visible depth.