bug: usdt receive copy puts a payment link on the clipboard instead of the address #995

Twin: synonymdev/bitkit-android#1556
Refs: Release 3.0.0 thread

What happened?

On the USDT receive screen, Copy puts the full EIP-681 payment link on the clipboard (ethereum:<token>@<chainId>/transfer?address=…), not the receive address. Pasting it into an exchange or another wallet's address field fails. Show Details copies the bare address correctly.

Code: UsdtReceiveView.swift:193-194 passes copyValue: uri, built from PaykitUsdt.paymentURI (PaykitUsdt.swift:28-29).

Expected behavior

Copy on the receive screen copies the plain receive address, matching Show Details. The QR code and Share can keep the payment link.

Bitkit Version

3.0.0 RC2.