A copy button next to the user's display name for ease of copy pasting into Udon systems that check the player's display name.

This would help a lot over just the text on the website as sometimes the name may have special characters that aren't in the font or visible (like zero width chatacters). Also fixes the issue of some browsers not displaying the text correctly (like custom font or unsupported character).

This would copy text that should work and match directly to what pulling displayName would retrieve in Udon. Regardless on how the font or bowser is currently displaying the text.