chore: add batch approve and swap

[cryptotavares]

Note

Adds a new batch USDC→ETH swap using wallet_sendCalls and refactors shared swap logic into swapUtils; updates Swap Comparison to use the shared utilities and wires the new component into the app.

• Transactions:
  • New batchUsdcSwap component (src/components/transactions/batchUsdcSwap.js):
    • Builds 3-call atomic batch (ERC20 approve → Permit2 approve → Universal Router swap) and submits via wallet_sendCalls (EIP-5792).
    • Supports configurable USDC amount, fee recipient, and fee percentage; displays status and batch ID.
• Refactor:
  • Extract shared swap utilities (src/components/transactions/swapUtils.js): constants (addresses, defaults), parsing helpers, V4 action builders, and encoding helpers (approve/permit2).
  • Update swapComparison to import from swapUtils, removing duplicated constants/helpers.
• Wiring:
  • Export batchUsdcSwap in components/transactions/index.js and render it in src/index.js.

^{Written by Cursor Bugbot for commit eaa6592. This will update automatically on new commits. Configure here.}

[cursor]

Bug: Swap Parameters: Order Matters

Parameter order mismatch in SWAP_EXACT_IN action. The SWAP_EXACT_IN_STRUCT expects parameters in order: currencyIn, path, amountIn, amountOutMinimum, but the object passed has path before currencyIn. This will cause incorrect encoding and transaction failure. Reorder the object properties to match the struct definition.