Smiley face part 1
A static smiley face is drawn in SVG, centered on a 960×500 canvas. The face consists of a yellow circle with a black stroke, two black-outlined eyes, and a mouth formed by a cropped annular sector. The mouth is created using the `d3.arc` API from D3 v7, with inner and outer radii that produce a thick arc, while the eyes and face are simple SVG circles. The components are rendered through React 18, assembled inside a single `<svg>` element with a group transform for positioning.