✨ feat: add notice modal component with empty state support

This commit introduces the following changes:

- Create a reusable NoticeModal component to handle system announcements
- Extract notice functionality from Home and HeaderBar components
- Add loading and empty states using Semi UI illustrations
- Implement "close for today" feature with localStorage
- Support both light and dark mode for empty state illustrations
- Add proper error handling and loading states
- Improve code reusability and maintainability

Breaking changes: None
Related components: HeaderBar.js, Home/index.js, NoticeModal.js

web/src/i18n/locales/en.json

@@ -1529,5 +1529,7 @@
   "系统公告": "System Notice",
   "今日关闭": "Close Today",
   "关闭公告": "Close Notice",
-  "搜索条件": "Search Conditions"
+  "搜索条件": "Search Conditions",
+  "加载中...": "Loading...",
+  "暂无公告": "No Notice"
 }