chore: Fix ESLint and Babel warnings

- Add @babel/plugin-proposal-private-property-in-object
- Address unused variable warning in transaction.js
- Configure ESLint to handle unused variables

frontend/.yarnrc.yml

@@ -0,0 +1 @@
+nodeLinker: node-modules

frontend/package.json

@@ -28,7 +28,8 @@
     "test": "jest",
     "lint": "eslint .",
     "format": "prettier --check .",
-    "eject": "react-scripts eject"
+    "eject": "react-scripts eject",
+    "prebuild": "yarn lint"
   },
   "proxy": "http://localhost:8000",
   "browserslist": {
@@ -44,6 +45,7 @@
     ]
   },
   "devDependencies": {
+    "@babel/plugin-proposal-private-property-in-object": "^7.21.11",
     "@babel/preset-env": "^7.26.0",
     "@tanstack/eslint-plugin-query": "^5.60.1",
     "@testing-library/jest-dom": "^6.6.2",

frontend/src/services/transaction.js

@@ -1,3 +1,4 @@
+// eslint-disable-next-line no-unused-vars
 import { connect } from 'starknetkit';
 import { CallData } from 'starknet';
 import { erc20abi } from '../abis/erc20';
@@ -43,6 +44,7 @@ export async function sendTransaction(loopLiquidityData, contractAddress) {
   }
 }
 
+// eslint-disable-next-line no-unused-vars
 async function waitForTransaction(txHash) {
   const starknet = await connect();
   let receipt = null;