Fork of Smiley Face Part II
A yellow smiley face fills the browser window, rendered as SVG via React components. The example uses d3’s `arc` generator to draw the mouth path, while separate React components define the background circle and two eyes. The face is centered using a translated `<g>` group, with eye positions and mouth radius controlled by numeric constants. The visualization demonstrates how D3’s shape APIs integrate cleanly with React’s component model, producing a static, scalable graphic without interaction or data binding.