One-click network setup

This calls wallet_addEthereumChain with the EEL RPC configuration.

Manual wallet settings

{
  "Network name": "EEL",
  "RPC URL": "https://eel.best/rpc",
  "Chain ID": 20260423,
  "Currency symbol": "EEL",
  "Decimals": 18,
  "Explorer": "https://eel.best/explorer.html"
}