kTransitionMilliseconds constant
The value of transitionDuration in milliseconds.
Eyeballed on a physical Pixel 9 running Android 16. This does not match the actual value used by native Android, which is 800ms, because native Android is using Material 3 Expressive springs that are not currently supported by Flutter. So for now at least, this is an approximation.
Implementation
static const int kTransitionMilliseconds = 450;