fix(evm-wallet-experiment): getBalance queries delegator balance, not delegate

The delegator holds the tokens; the delegate only has permission to
transfer them. encodeBalanceOf(delegation.delegate) returned the
delegate's own balance, which is irrelevant to the delegation's spending
capacity. Query delegation.delegator instead.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: grypez

packages/evm-wallet-experiment/src/lib/delegation-twin.ts

@@ -217,7 +217,7 @@ export function makeDelegationTwin(
     methods.getBalance = async (): Promise<bigint> => {
       const result = await readFn({
         to: token,
-        data: encodeBalanceOf(delegation.delegate),
+        data: encodeBalanceOf(delegation.delegator),
       });
       return decodeBalanceOfResult(result);
     };