fix: Refactor imports in OfflineMode, Settings, and API services

### Summary of Changes
- Removed unused imports from `OfflineMode.js` and `Settings.js` to streamline the code.
- Cleaned up the import statements in `api.js` by eliminating the unused `formatServiceData` and `formatEventData` functions.

### Expected Results
- Improved code clarity and maintainability by adhering to clean code principles and reducing unnecessary dependencies.

frontend/src/components/OfflineMode.js

@@ -1,6 +1,6 @@
 import React from 'react';
 import { Alert, Button, Space } from 'antd';
-import { WifiOutlined, ReloadOutlined } from '@ant-design/icons';
+import { ReloadOutlined } from '@ant-design/icons';
 
 const OfflineMode = ({ onRetry }) => {
   return (

frontend/src/components/Settings.js

@@ -1,7 +1,7 @@
 import React, { useState } from 'react';
-import { Card, Form, Input, Button, Switch, Select, Divider, Typography, message } from 'antd';
+import { Card, Form, Input, Button, Switch, Select, Typography, message } from 'antd';
 
-const { Title, Text } = Typography;
+const { Title } = Typography;
 const { Option } = Select;
 
 const Settings = () => {

frontend/src/services/api.js

@@ -1,6 +1,6 @@
 import axios from 'axios';
 import { API_CONFIG, SERVICE_URLS, FALLBACK_DATA } from '../constants';
-import { handleRequestError, formatServiceData, formatEventData } from '../utils/errorHandling';
+import { handleRequestError } from '../utils/errorHandling';
 
 // Create axios instances with timeout and error handling
 const apiClient = axios.create({