Add UniswapV4 support to Unichain

src/chains/Unichain/Common.sol

@@ -4,6 +4,7 @@ pragma solidity =0.8.25;
 import {SettlerBase} from "../../SettlerBase.sol";
 
 import {IERC20} from "@forge-std/interfaces/IERC20.sol";
+import {UniswapV4} from "../../core/UniswapV4.sol";
 import {FreeMemory} from "../../utils/FreeMemory.sol";
 
 import {ISettlerActions} from "../../ISettlerActions.sol";
@@ -18,22 +19,35 @@ import {
 } from "../../core/univ3forks/UniswapV3.sol";
 
 // Solidity inheritance is stupid
-//import {SettlerAbstract} from "../../SettlerAbstract.sol";
+import {SettlerAbstract} from "../../SettlerAbstract.sol";
 
-abstract contract UnichainMixin is FreeMemory, SettlerBase {
+abstract contract UnichainMixin is FreeMemory, SettlerBase, UniswapV4 {
     constructor() {
         assert(block.chainid == 0 || block.chainid == 31337); // TODO:
     }
 
     function _dispatch(uint256 i, uint256 action, bytes calldata data)
         internal
         virtual
-        override(/* SettlerAbstract, */SettlerBase)
+        override(SettlerAbstract, SettlerBase)
         DANGEROUS_freeMemory
         returns (bool)
     {
         if (super._dispatch(i, action, data)) {
             return true;
+        } else if (action == uint32(ISettlerActions.UNISWAPV4.selector)) {
+            (
+                address recipient,
+                IERC20 sellToken,
+                uint256 bps,
+                bool feeOnTransfer,
+                uint256 hashMul,
+                uint256 hashMod,
+                bytes memory fills,
+                uint256 amountOutMin
+            ) = abi.decode(data, (address, IERC20, uint256, bool, uint256, uint256, bytes, uint256));
+
+            sellToUniswapV4(recipient, sellToken, bps, feeOnTransfer, hashMul, hashMod, fills, amountOutMin);
         } else {
             return false;
         }

src/chains/Unichain/MetaTxn.sol

@@ -25,6 +25,20 @@ contract UnichainSettlerMetaTxn is SettlerMetaTxn, UnichainMixin {
     {
         if (super._dispatchVIP(action, data, sig)) {
             return true;
+        } else if (action == uint32(ISettlerActions.METATXN_UNISWAPV4_VIP.selector)) {
+            (
+                address recipient,
+                bool feeOnTransfer,
+                uint256 hashMul,
+                uint256 hashMod,
+                bytes memory fills,
+                ISignatureTransfer.PermitTransferFrom memory permit,
+                uint256 amountOutMin
+            ) = abi.decode(
+                data, (address, bool, uint256, uint256, bytes, ISignatureTransfer.PermitTransferFrom, uint256)
+            );
+
+            sellToUniswapV4VIP(recipient, feeOnTransfer, hashMul, hashMod, fills, permit, sig, amountOutMin);
         } else {
             return false;
         }

src/chains/Unichain/TakerSubmitted.sol

@@ -21,6 +21,21 @@ contract UnichainSettler is Settler, UnichainMixin {
     function _dispatchVIP(uint256 action, bytes calldata data) internal override DANGEROUS_freeMemory returns (bool) {
         if (super._dispatchVIP(action, data)) {
             return true;
+        } else if (action == uint32(ISettlerActions.UNISWAPV4_VIP.selector)) {
+            (
+                address recipient,
+                bool feeOnTransfer,
+                uint256 hashMul,
+                uint256 hashMod,
+                bytes memory fills,
+                ISignatureTransfer.PermitTransferFrom memory permit,
+                bytes memory sig,
+                uint256 amountOutMin
+            ) = abi.decode(
+                data, (address, bool, uint256, uint256, bytes, ISignatureTransfer.PermitTransferFrom, bytes, uint256)
+            );
+
+            sellToUniswapV4VIP(recipient, feeOnTransfer, hashMul, hashMod, fills, permit, sig, amountOutMin);
         } else {
             return false;
         }