measurement y values for nodes used in stickyHeaderIndices do not match it's sticky positioning

Description

When a node which is included in a list that specifies it in it's stickyHeaderIndices is measured via it's ref using measure or measureInWindow, the y and pageY values reflect the node's original coordinates and do not account for it's sticky positioning.

Steps to reproduce

1. Scroll a list until the node(s) in stickyHeaderIndices become sticky
2. Measure the sticky node via it's ref

Expected:

Coordinates reflect it's current, sticky position on the screen or in the viewport, like how it works on the legacy architecture.

Actual:

Coordinates reflect it's original positioning, not accounting for it's sticky position, so once the element becomes sticky due to scroll the y values will be negative.

React Native Version

0.79.2

Affected Platforms

Runtime - iOS

Areas

Other (please specify), Fabric - The New Renderer

Output of npx @react-native-community/cli info

System:
  OS: macOS 14.6.1
  CPU: (12) arm64 Apple M2 Pro
  Memory: 154.50 MB / 32.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 20.19.1
    path: /usr/local/bin/node
  Yarn:
    version: 1.22.19
    path: ~/.yarn/bin/yarn
  npm:
    version: 10.8.2
    path: /usr/local/bin/npm
  Watchman:
    version: 2024.09.09.00
    path: /usr/local/bin/watchman
Managers:
  CocoaPods:
    version: 1.11.3
    path: /Users/adamhari/.rvm/gems/ruby-2.7.6/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.2
      - iOS 18.2
      - macOS 15.2
      - tvOS 18.2
      - visionOS 2.2
      - watchOS 11.2
  Android SDK: Not Found
IDEs:
  Android Studio: 2023.1 AI-231.9392.1.2311.11330709
  Xcode:
    version: 16.2/16C5032a
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.10
    path: /usr/bin/javac
  Ruby:
    version: 2.7.6
    path: /Users/adamhari/.rvm/rubies/ruby-2.7.6/bin/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 19.0.0
    wanted: 19.0.0
  react-native:
    installed: 0.79.2
    wanted: 0.79.2
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: Not found
  newArchEnabled: Not found
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found

Stacktrace or Logs

n/a

MANDATORY Reproducer

https://snack.expo.dev/@adamhari-kashoo/measure-y-value-incorrect-for-element-in-stickyheaderindices

Screenshots and Videos

https://github.com/user-attachments/assets/cec10b97-ac2e-4931-b920-0fe045725f38

Start by running the mandatory Snack reproducer on iOS and comparing measurements before and after a node in stickyHeaderIndices becomes sticky. Investigate the Fabric measurement behavior for measure and measureInWindow, using the legacy architecture's result as the expected reference. Done means the reported y and pageY coordinates reflect the node's current sticky position rather than its original position.