fix: not being able to claim from V1 staking (#739)

* fix: not being able to claim from V1 staking

* chore: clarify TX param

* fix: error when reloading the app at /stake/rewards

frontend/app/src/screens/StakeScreen/PanelRewards.tsx

@@ -15,7 +15,7 @@ import { useTransactionFlow } from "@/src/services/TransactionFlow";
 import { css } from "@/styled-system/css";
 import { Button, HFlex, TokenIcon, VFlex } from "@liquity2/uikit";
 import * as dn from "dnum";
-import { encodeFunctionData } from "viem";
+import { encodeFunctionData, zeroAddress } from "viem";
 import { useEstimateGas, useGasPrice } from "wagmi";
 
 export function PanelRewards() {
@@ -26,16 +26,16 @@ export function PanelRewards() {
   const ethPrice = usePrice("ETH");
 
   const stakePosition = useStakePosition(account.address ?? null);
-  const LqtyStaking = getProtocolContract("LqtyStaking");
+  const Governance = getProtocolContract("Governance");
 
   const gasEstimate = useEstimateGas({
     account: account.address,
     data: encodeFunctionData({
-      abi: LqtyStaking.abi,
-      functionName: "unstake",
-      args: [0n],
+      abi: Governance.abi,
+      functionName: "claimFromStakingV1",
+      args: [account.address ?? zeroAddress], // address to receive the payout
     }),
-    to: LqtyStaking.address,
+    to: Governance.address,
   });
 
   const gasPrice = useGasPrice();

frontend/app/src/tx-flows/stakeClaimRewards.tsx

@@ -85,11 +85,11 @@ export const stakeClaimRewards: FlowDeclaration<StakeClaimRewardsRequest> = {
       name: () => "Claim rewards",
       Status: TransactionStatus,
 
-      async commit({ contracts, wagmiConfig }) {
+      async commit({ contracts, wagmiConfig, request }) {
         return writeContract(wagmiConfig, {
-          ...contracts.LqtyStaking,
-          functionName: "unstake",
-          args: [0n],
+          ...contracts.Governance,
+          functionName: "claimFromStakingV1",
+          args: [request.stakePosition.owner], // address to receive the payout
         });
       },