`copy-on-y` is invisible

[fregante]

You press y but has anything happened? We can:

• Add visual popup, maybe use GitHub's own clipboard element

Test URLs

Any page, particularly it should work copy the permalink when y is pressed on:

https://github.com/refined-github/refined-github/blob/main/.gitignore

[SunsetTechuila]

Also the shortcut isn't registered:

refined-github/source/features/copy-on-y.tsx

Lines 17 to 19 in 729de3b

	void features.add(import.meta.url, {
	init,
	});