PR Description

This PR adds support for 16 KB memory page size on Android 15+ devices.
To achieve this, the build.gradle file was updated to enable flexible page size support in the native build process by passing the following argument to CMake:

externalNativeBuild {
  cmake {
    arguments "-DANDROID_SUPPORT_FLEXIBLE_PAGE_SIZES=ON"
  }
}

This ensures the React Native app can run correctly on newer Android devices that ship with a 16 KB page size by default.

How to test?

1. Build and install the app on an Android 15 emulator or device configured with a 16 KB page size.
2. Verify that the app launches and runs without native crashes related to memory mapping or page alignment.
3. Optionally, test on devices with 4 KB page size to confirm backward compatibility.

Screenshots

No UI changes.