Method setGapPercent

src/native-ts/yoga-layout/index.ts:857–860

(gutter: Gutter, v: number)

    this.markDirty()
  }
  setGapPercent(gutter: Gutter, v: number): void {
    this.style.gap[gutter] = percentValue(v)
    this.markDirty()
  }

  // -- Style getters (partial — only what tests need)