message: Use top inset to calculate layout offset properly on iOS
diff: }
  .SplitLayout--ios .SplitLayout__inner--header {
  - margin-top: calc(-1 * var(--panelheader_height_ios));
  + margin-top: calc(-1 * calc(var(--panelheader_height_ios) + var(--safe-area-inset-top)));
  }
  .SplitLayout--android .SplitLayout__inner--header,
  