[Feature Request] Keyboard shortcut to toggle the amend checkbox

[ravindUwU]

The amend checkbox can't be keyboard-activated as far as I know, either via a dedicated shortcut, or via Tab (with the commit subject field focused, pressing Tab twice and then Space doesn't seem to toggle it).

^{Screenshot from Fork 2.21.1.0 on Windows 11}

Would it be possible to add a shortcut to toggle the state of the amend checkbox, to Fork for Windows? My understanding is that Fork for macOS has a dedicated shortcut Cmd+Shift+A for this.

Thanks! 😄