Inconsistent focus positioning between Android 14 and Android 15 (Edge-to-Edge coordinate mismatch)

[Marvin-DHC]

After attempting to fix a vertical offset issue on Android 15
(targetSdk 35, Edge-to-Edge enforced),
the same fix causes incorrect positioning on Android 14 and below.

This appears to be caused by a coordinate system mismatch:

• FancyShowCaseView overlay uses window (DecorView) coordinates.
• View position APIs such as getGlobalVisibleRect() / getLocationOnScreen()
  return:
  • window-aligned coordinates on Android 14 and below
  • screen coordinates on Android 15 when Edge-to-Edge is enforced

There is currently no way to support both Android 14 and Android 15 correctly
without conditional, app-level workarounds.