Tutorial issues: wrong default EntryPoint address and incorrect viem destructuring

Tutorial: https://docs.openzeppelin.com/contracts/5.x/learn/webauthn-smart-accounts

Issue 1: Default entryPoint() doesn't match the tutorial's EntryPoint address

Account.sol defaults to ENTRYPOINT_V09 (0x433709009B8330FDa32311DF1C2AFA402eD8D009), but the tutorial uses ENTRYPOINT_V08 (0x4337084D9E255Ff0702461CF8895CE9E3b5Ff108). This mismatch causes validateUserOp to revert with AA23 because the onlyEntryPoint check fails.

The fix is to add this override to AccountWebAuthn:

function entryPoint() public view virtual override returns (IEntryPoint) {
    return ERC4337Utils.ENTRYPOINT_V08;
}

Issue 2: predictAddress return value incorrectly destructured

The tutorial uses array destructuring on a function that returns a single address:

// ❌ Wrong - destructures the address string as a char array, predictedAddress = "0"
const [predictedAddress] = await publicClient.readContract({ ... });

// ✅ Correct
const predictedAddress = await publicClient.readContract({ ... });

Open the webauthn smart accounts tutorial and locate the AccountWebAuthn example and the predictAddress call. Confirm the EntryPoint version used by the tutorial, add the documented override, and use the single address return value without array destructuring; the tutorial should then match its stated address and avoid the AA23 failure.