Function packWord1

src/ink/screen.ts:370–376

(
  styleId: number,
  hyperlinkId: number,
  width: number,
)

// Pack styleId, hyperlinkId, and width into a single Int32
function packWord1(
  styleId: number,
  hyperlinkId: number,
  width: number,
): number {
  return (styleId << STYLE_SHIFT) | (hyperlinkId << HYPERLINK_SHIFT) | width
}

// Unwritten cell as BigInt64 — both words are 0, so the 64-bit value is 0n.
// Used by BigInt64Array.fill() for bulk clears (resetScreen, clearRegion).