refactor: update code to use centralized Ant Design imports

- Replaced direct import of '@ant-design/icons' with centralized import from '@/shared/antd-imports'

worklenz-frontend/src/features/navbar/timers/timer-button.tsx

@@ -1,4 +1,4 @@
-import { ClockCircleOutlined, StopOutlined } from '@ant-design/icons';
+import { ClockCircleOutlined, StopOutlined } from '@/shared/antd-imports';
 import { Badge, Button, Dropdown, List, Tooltip, Typography, Space, Divider, theme } from '@/shared/antd-imports';
 import React, { useEffect, useState, useCallback } from 'react';
 import { useTranslation } from 'react-i18next';