Consistent ViewBox Size

All icons must use the same viewBox (14x14 recommended).

Incorrect (mixed scales):

const icon1 = { lines: [{ x1: 2, y1: 7, x2: 12, y2: 7 }, ...] }; // 14x14
const icon2 = { lines: [{ x1: 4, y1: 14, x2: 24, y2: 14 }, ...] }; // 28x28

Correct (consistent scale):

const VIEWBOX_SIZE = 14;
const CENTER = 7;