Function decodeApproveCalldata

decodeApproveCalldata(calldata: string): { spender: string; amount: string }
Decodes the approve() calldata from a hex string to extract spender and amount.
Parameters
- calldata: string
  Hex-encoded approve() calldata (with or without 0x prefix)
Returns { spender: string; amount: string }
Decoded spender and amount, or null if not valid approve() calldata
Example
```
const decoded = decodeApproveCalldata("0x095ea7b3...");
if (decoded) {
  console.log(decoded.spender, decoded.amount);
}
```
- Defined in extensions/src/erc20-approval-gas-sponsoring/facilitator.ts:170