- Add wallet icon (add to MetaMask) on WETH page, Tokens list, token detail
- addTokenToWallet() via EIP-747 wallet_watchAsset; toasts for success/error
- Known-token overrides: WETH9/WETH10 display name and symbol WETH; decimals 18
- Token list: show Wrapped Ether (WETH) for WETH9/WETH10 when API missing
- Token detail: force 18 decimals and name/symbol for WETH9/WETH10
- CSS for .btn-add-token-wallet
Co-authored-by: Cursor <cursoragent@cursor.com>