iOS captures an element in Display P3 when it is on screen and in sRGB when it is partly off it #281

Describe the bug

On iOS, screen.screenshot(element) captures an element that is fully on screen with captureScreenshotWithBounds: (drawViewHierarchyInRect:) and one that is partly off screen with captureScreenshotOfView: (renderInContext:), both in packages/ui/ios/ViewQueryHelper.mm and both through a UIGraphicsImageRendererFormat left at its default range. On the E2E workflow's iPhone 17 Pro simulator the first comes out as a 16-bit PNG tagged Display P3 (iCCP kCGColorSpaceDisplayP3, cICP primaries 12) and the second as an 8-bit sRGB PNG. toMatchImageSnapshot compares raw values with pngjs, which ignores the profile, so one colour gets two values depending on where the element sits: the playground's orange is 242,169,59 in ios/orange-square-element-only.png and 255,165,0 in ios/out-of-bounds.png.

I expected every capture in one colour space, for example both renderers set to format.preferredRange = UIGraphicsImageRendererFormatRangeStandard.

System Info

System:
  OS: macOS 26 (GitHub Actions macos-26)
  Xcode: 26.4.1
  Simulator: iPhone 17 Pro, iOS 26.4

React Native Harness Version

1.6.0 (captured on main at 9a505a8; packages/ui/ios is unchanged at 81ed195)

Reproduction

https://github.com/YevheniiKotyrlo/react-native-harness/tree/fix/missing-image-snapshot-on-ci/apps/playground/src/__tests__/normal/ui/__image_snapshots__/ios

Steps to reproduce

1. Run the playground's ui/screenshot.harness.tsx and ui/out-of-bounds.harness.tsx with the ios runner, so they write __image_snapshots__/ios/orange-square-element-only.png (the orange square, fully on screen) and ios/out-of-bounds.png (a 1000 dp row, partly off screen). The two files linked above are the E2E workflow's captures, which fix(bridge): fail a missing image snapshot in CI mode instead of writing it #249 commits.
2. Look at their chunks: the first is 16-bit with an iCCP Display P3 profile and a cICP chunk, the second 8-bit with an sRGB chunk.
3. Read an orange pixel with pngjs (PNG.sync.read): 242,169,59 at (37, 150) of the first, 255,165,0 at (1650, 150), the sixth square, of the second.