feat(wallets): connect MetaMask via multichain#105
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… + Solana)
Route WalletOption.METAMASK through MetaMask's multichain CAIP-25 SDK so a single
session/approval covers EVM and Solana (and future ecosystems). A dedicated
metamaskWallet connector opens one session over all requested scopes, then adapts
invokeMethod into each existing SwapKit toolbox:
- EVM: an EIP-1193 shim over invokeMethod -> ethers BrowserProvider ->
getWeb3WalletMethods (reused unchanged).
- Solana: a SolanaProvider-style signer whose signTransaction calls
solana_signTransaction (sign-only; SwapKit broadcasts) -> getSolanaToolbox.
Also registers metamaskWallet in the SDK defaultWallets + re-exports, repoints the
METAMASK types, adds @metamask/connect-multichain and @solana/web3.js deps plus the
./metamask subpath export, and adds the Vite optimizeDeps config the connect SDK needs.
Import Chain as a value, drop the readonly->mutable EVMChains cast, use the Chain.Solana enum in chainToScope, and pass supportedChains as a plain Chain[] ([...EVMChains, Chain.Solana]) with directSigningSupport — mirroring the phantom and evmWallet connectors. Removing the 'as EVMChain[]' cast restores createWallet's generic inference, which also clears the cascaded 'name is missing' (index.ts) and 'possibly undefined' (types.ts) errors.
getWeb3WalletMethods always wraps the toolbox in prepareNetworkSwitch, which is built for injected wallets that switch an active chain before signing. In a CAIP-25 multichain session the scope already pins the chain, so answer wallet_switchEthereumChain / wallet_addEthereumChain locally as no-ops instead of forwarding them into invokeMethod (where they're meaningless and may throw).
…into pr/metamask-multichain
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