fix: Fix bug with token indexing when wrapping/unwrapping

The issue was that we weren't indexing WETH properly since it was looking for the WETH address in tokens, when only native ETH would be in there

- Found by adding integration tests for the wrapping and unwrapping cases.

foundry/src/TychoRouter.sol

@@ -207,6 +207,7 @@ contract TychoRouter is
             tokenInIndex = swapData.tokenInIndex();
             tokenOutIndex = swapData.tokenOutIndex();
             split = swapData.splitPercentage();
+
             currentAmountIn = split > 0
                 ? (amounts[tokenInIndex] * split) / 0xffffff
                 : remainingAmounts[tokenInIndex];