apply security audit

frontend/src/utils/storage.ts

@@ -28,6 +28,33 @@ export const removeToken = (): void => {
   }
 };
 
+const REFRESH_TOKEN_KEY = 'auth_refresh_token';
+
+export const getRefreshToken = (): string | null => {
+  try {
+    return localStorage.getItem(REFRESH_TOKEN_KEY);
+  } catch (error) {
+    console.error('Error getting refresh token from localStorage:', error);
+    return null;
+  }
+};
+
+export const setRefreshToken = (token: string): void => {
+  try {
+    localStorage.setItem(REFRESH_TOKEN_KEY, token);
+  } catch (error) {
+    console.error('Error setting refresh token in localStorage:', error);
+  }
+};
+
+export const removeRefreshToken = (): void => {
+  try {
+    localStorage.removeItem(REFRESH_TOKEN_KEY);
+  } catch (error) {
+    console.error('Error removing refresh token from localStorage:', error);
+  }
+};
+
 export const getUser = (): User | null => {
   try {
     const userStr = localStorage.getItem(USER_KEY);