fix: handle zero swap tx gas value in 'executeSwapQuote'

[gabrielstoica]

There's an issue currently when using the useTestnet: true flag with certain RPC providers, where viem rejects the swap tx when the getSwapQuote call returns swapTx.quote as 0n.

That's because the current gas conversion logic treats it as a valid value because "0" is a truthy string in JavaScript: gas: swapTx.gas ? BigInt(swapTx.gas) : undefined. This produces gas: 0n, which gets passed to originClient.call() for transaction simulation.

Certain RPC providers (e.g. Alchemy on testnets) reject eth_call requests with gas: "0x0", resulting in an IntrinsicGasTooLowError.

Explicitly checking for zero-ish swapTx.gas fixes the issue and returns undefined for 0n gas values.

Steps to reproduce

1. Initialize the SDK with useTestnet: true and testnet chains (e.g. Base Sepolia, Sepolia);
2. Retrieve a swap quote via getSwapQuote;
3. Execute the quote via executeSwapQuote;
4. The simulation step fails with IntrinsicGasTooLowError: The amount of gas provided forthe transaction is too low;

Full log:

Error executing
  across quote:  CallExecutionError: The amount of gas provided for the transaction is
  too low.

  Raw Call Arguments:
    from:   0xCAb50e4eb8a04334821Af34838D25bb95a3D8934
    to:     0x8FE6B999Dc680CcFDD5Bf7EB0974218be2542DAA
    value:  0 ETH
    data:   0x8e0250ee0000000000000000000000000000000000000000000000000000000000989680000
  0000000000000000000000000000000000000000000000000000000000000000000000000000000000000ca
  b50e4eb8a04334821af34838d25bb95a3d8934000000000000000000000000036cbd53842c5426634e79295
  41ec2318f3dcf7e000000000000000000000000708704d33ace3dafbed28f150a56ce9d124b1ef800000000
  000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
  0000000000000000000000000000007d01dc0dedead73c0de
    gas:    0

  Details: intrinsic gas too low
  Version: viem@2.33.1
      at async executeAcrossQuote (Bridge.tsx:210:7)
  Caused by: IntrinsicGasTooLowError: The amount of gas provided for the transaction is
  too low.

  Details: intrinsic gas too low
  Version: viem@2.33.1
      at async executeAcrossQuote (Bridge.tsx:210:7)
  Caused by: InvalidInputRpcError: Missing or invalid parameters.
  Double check you have provided the correct parameters.

  URL: https://base-sepolia.g.alchemy.com/v2/XGSPB5uNDfvo4eu9IWk_G
  Request body: {"method":"eth_call","params":[{"data":"0x8e0250ee00000000000000000000000
  000000000000000000000000000000000009896800000000000000000000000000000000000000000000000
  000000000000000000000000000000000000000000cab50e4eb8a04334821af34838d25bb95a3d893400000
  0000000000000000000036cbd53842c5426634e7929541ec2318f3dcf7e0000000000000000000000007087
  04d33ace3dafbed28f150a56ce9d124b1ef8000000000000000000000000000000000000000000000000000
  000000000000000000000000000000000000000000000000000000000000000000000000007d01dc0dedead
  73c0de","from":"0xCAb50e4eb8a04334821Af34838D25bb95a3D8934","gas":"0x0","to":"0x8FE6B99
  9Dc680CcFDD5Bf7EB0974218be2542DAA","value":"0x0"},"latest"]}

  Details: intrinsic gas too low
  Version: viem@2.33.1
  Caused by: RpcRequestError: RPC Request failed.

  URL: https://base-sepolia.g.alchemy.com/v2/XGSPB5uNDfvo4eu9IWk_G
  Request body: {"method":"eth_call","params":[{"data":"0x8e0250ee00000000000000000000000
  000000000000000000000000000000000009896800000000000000000000000000000000000000000000000
  000000000000000000000000000000000000000000cab50e4eb8a04334821af34838d25bb95a3d893400000
  0000000000000000000036cbd53842c5426634e7929541ec2318f3dcf7e0000000000000000000000007087
  04d33ace3dafbed28f150a56ce9d124b1ef8000000000000000000000000000000000000000000000000000
  000000000000000000000000000000000000000000000000000000000000000000000000007d01dc0dedead
  73c0de","from":"0xCAb50e4eb8a04334821Af34838D25bb95a3D8934","gas":"0x0","to":"0x8FE6B99
  9Dc680CcFDD5Bf7EB0974218be2542DAA","value":"0x0"},"latest"]}

  Details: intrinsic gas too low
  Version: viem@2.33.1

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