Add name and icon to WalletInfo for richer wallet objects

[satoshai-dev]

Summary

Enrich the WalletInfo type returned by useWallets with name and icon properties so consumers can build wallet selection UIs without hardcoding wallet metadata.

Motivation

wagmi connectors expose name, icon, and type on each connector object. Our WalletInfo currently only has { id, available }, forcing consumers to maintain their own mapping of wallet IDs to display names and icons.

Proposed API

interface WalletInfo {
    id: SupportedStacksWallet;
    name: string;        // e.g. "Xverse", "Leather", "OKX Wallet"
    icon: string;        // URL or data URI for the wallet icon
    available: boolean;
}

const { wallets } = useWallets();
// [{ id: 'xverse', name: 'Xverse', icon: '...', available: true }, ...]

Context

Identified during API comparison with wagmi in PR #2.