Raw window.ethereum is unreliable when several extensions contend for it, so
desktop now opens the RainbowKit connect modal (EIP-6963 wallet discovery +
WalletConnect QR) when a project id is configured, falling back to the injected
flow otherwise. In-wallet mobile browsers keep the direct injected sign.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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