Keyboard operation does not work for "down" and "up" events on ui-button

Keyboard operations work for click (as expected) but the new functionality for "down" and "up" do not work as expected

>> Also, I see you have merged the original PR but as far as I can see, the OP did not address the lack of keyboard operation as raised in the comments:

> Not a blocker for why this shouldn't have been merged though. Raise a new issue please.

_Originally posted by @joepavitt in https://github.com/FlowFuse/node-red-dashboard/issues/1355#issuecomment-2387895255_