VxToast behind system nav bar in android 15 (edge-to-edge)

[btraas]

Describe the bug
When using edge-to-edge mode (now enforced in android 15), VxToast can appear behind the system nav bar.

To Reproduce
Steps to reproduce the behavior:

1. Set targetSdk to 35 in app/build.gradle
2. Add a basic VxToast, i.e. VxToast.show(context, msg: "Hello World".text.make());
3. Test on an android 15 device with system navigation bar enabled, and not a high resolution (see below). Likely not replicable on a tablet or XL / plus size device.
4. See toast behind navigation bar (or at least much lower than it should be / lower than it is on API 34)

Expected behavior
Toast appears fully above the navigation bar

Screenshots

Desktop
N/A

Smartphone

• Device: Pixel 9 pro
• Vertical DP: 857 or lower, (display size 3/5 or higher on a pixel 9 pro) (important!)
• OS: Android 15
• Navigation mode: 3-button navigation (important)
• Version: Flutter 3.27+ (tested 3.32.1), Android targetSdk 35+ (tested targetSdk 35)

Additional context

This is a result of "edge to edge" mode, which is now enforced in android 15 / API 35, when the navigation bar is enabled on the device (i.e. not the fancy new swipe gestures).

https://docs.flutter.dev/release/breaking-changes/default-systemuimode-edge-to-edge

It can be replicated in a basic flutter app that meets all of these conditions:

• Flutter 3.27+
• Android targetSdk 35+ in app/build.gradle
• Device has android 15+
• Device has navigation bar enabled (not swipe gestures)

Occurs with basic VxToast usage:

• VxToast.show(context, msg: "Hello World".text.make());

Note: because VelocityX uses a percentage-based positioning, devices with a high vertical resolution may not be cut off.

Example app with issue:
https://github.com/btraas/vxtoast_android15_demo

Simple commit that fixes the issue:
stable...btraas:VelocityX:edge_to_edge_fix

Would you like me to submit a PR? I have verified that this change makes API 35 now have the same toast position as API 34. I have also tested this commit on android API 34 and iOS.