correct, it doesn't need to show in the browser (also there is no way for kagi to tell a browser that it should show the copy button). (if I press enter on the 25 in firefox there, it will just copy to clipboard directly).
I do expect it to work the same on kagi.Com and the mobile app though, if I press the calculated answer, it should copy to clipboard.
But yeah, this is not about the autosuggest in the brower url bar as that's already covered by the browser