Smiley Face Part I
A smiling face constructed from basic SVG shapes sits at the center of a yellow circle with a black stroke. Two black eye circles and a curved mouth path, drawn using D3's `arc()` generator, complete the half-finished expression. The React component renders these shapes inside an SVG container, with D3 v7 handling the arc's angles and radii. The fixed dimensions and coordinate translations position the face precisely on a 960-by-500 canvas.