fix: remove hex amount leading zeros

[cryptotavares]

Forget to remove hex amount leading zeros, which was causing the eth_estimateGas to fail on some amounts with the following error return from the rpc provider invalid argument 0: json: cannot unmarshal hex number with leading zero digits into Go struct field TransactionArgs.value of type *hexutil.Big.

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Note

Ensure ETH amounts are hex-encoded without leading zeros when building swap transactions.

• Transactions (src/components/transactions/swapComparison.js):
  • Add stripLeadingZeros helper to normalize hex strings.
  • Apply leading-zero stripping to parseEthAmount output and default ethAmountHex calculation.
  • No other logic changes to swap building or UI.

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