Add useAccountSync hook

frontend/src/App.tsx

@@ -2,8 +2,11 @@ import { Card } from './components/Card';
 import { FAQ } from './components/FAQ';
 import { ConnectMassaWallet, Button, Toast } from '@massalabs/react-ui-kit';
 import { MNSManagement } from './components/MnsManagement';
+import useAccountSync from './hooks/useAccountSync';
 
 function App() {
+  useAccountSync();
+
   return (
     <>
       <Toast />

frontend/src/hooks/useAccountSync.tsx

@@ -0,0 +1,66 @@
+import { useCallback, useEffect, useRef } from 'react';
+import { useAccountStore } from '@massalabs/react-ui-kit/src/lib/ConnectMassaWallets';
+import { useLocalStorage } from '@massalabs/react-ui-kit/src/lib/util/hooks/useLocalStorage';
+import { getWallets } from '@massalabs/wallet-provider';
+
+type SavedAccount = {
+  address: string;
+  providerName: string;
+};
+
+const EMPTY_ACCOUNT: SavedAccount = {
+  address: '',
+  providerName: '',
+};
+
+const useAccountSync = () => {
+  const initializedRef = useRef(false);
+  const { connectedAccount, setCurrentWallet } = useAccountStore();
+  const [savedAccount, setSavedAccount] = useLocalStorage<SavedAccount>(
+    'saved-account',
+    EMPTY_ACCOUNT,
+  );
+
+  const findAccountInWallets = useCallback(async (address: string) => {
+    const wallets = await getWallets();
+    for (const wallet of wallets) {
+      const accounts = await wallet.accounts();
+      const matchingAccount = accounts.find((acc) => acc.address === address);
+      if (matchingAccount) {
+        return { account: matchingAccount, wallet };
+      }
+    }
+    return null;
+  }, []);
+
+  const restoreSavedAccount = useCallback(async () => {
+    if (!savedAccount.address) return;
+
+    const storedAccount = await findAccountInWallets(savedAccount.address);
+    if (storedAccount) {
+      const { wallet, account } = storedAccount;
+      setCurrentWallet(wallet, account);
+    }
+  }, [savedAccount.address, findAccountInWallets, setCurrentWallet]);
+
+  useEffect(() => {
+    const isNewAccount =
+      connectedAccount && connectedAccount.address !== savedAccount.address;
+
+    if (isNewAccount) {
+      const { address, providerName } = connectedAccount;
+      setSavedAccount({ address, providerName });
+    }
+  }, [connectedAccount, savedAccount.address, setSavedAccount]);
+
+  useEffect(() => {
+    if (!initializedRef.current) {
+      initializedRef.current = true;
+      restoreSavedAccount();
+    }
+  }, [restoreSavedAccount]);
+
+  return { setSavedAccount };
+};
+
+export default useAccountSync;