D3 v5 Zoomable Sunburst
This interactive zoomable sunburst displays hierarchical data from a JSON file, showing nested categories and values. The visualization updates its arcs and labels with smooth, 750-millisecond transitions, allowing users to click any arc to zoom in and focus on a sub-branch. Built with D3 v5, it uses the `d3.partition` layout, `d3.arc` for geometry, and `d3.scaleOrdinal` with `d3.interpolateRainbow` for color coding. The code employs `transition.attrTween` for animated path and label updates, with SVG rendering and hover tooltips showing the full path and value.