Front-End Integration

- Wallet connection: wagmi + viem (or ethers.js v6), support MetaMask, WalletConnect, Coinbase Wallet - Read hooks: useContractRead for view functions, cached with SWR/TanStack Query - Write flows: useContractWrite with transaction lifecycle (pending -> mining -> confirmed -> error) - Transaction status UI: toast notifications, block explorer links, Etherscan links - Gas estimation display and "speed up" / "cancel" transaction support - Error handling: contract revert reason decoding (custom errors), user-friendly messages