Add support for additional wallet integrations (WalletConnect, Ledger, etc.)

Add support for multiple wallet connection methods beyond MetaMask, including WalletConnect and hardware wallets such as Ledger. Use case: users who prefer alternative wallets or hardware signing should be able to connect, authenticate, and sign transactions through their chosen provider. Expected behavior: the wallet selection flow presents supported options (e.g., MetaMask, WalletConnect, Ledger via WalletConnect or native Ledger integration), successfully establishes a secure connection, displays account information and balances, allows transaction signing and submission, and persists the chosen wallet selection where appropriate. The implementation should include error handling for connection failures and clear UI guidance for connecting hardware wallets.