refactor(DynamicTracking): 将 NewsEventsTab 移至正确目录并重构

- 从 CompanyOverview/ 移动到 DynamicTracking/（修复跨目录引用）
- 拆分为目录结构：constants.ts, types.ts, utils.ts
- 提取 5 个子组件：NewsSearchBar, NewsEventCard, NewsPagination,
  NewsEmptyState, NewsLoadingState
- 转换为 TypeScript，添加完整类型定义（ThemeConfig, NewsEvent 等）
- 所有子组件使用 React.memo 优化渲染
- 更新 NewsPanel.js 引用路径

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/views/Company/components/DynamicTracking/NewsEventsTab/utils.ts

@@ -0,0 +1,101 @@
+// src/views/Company/components/DynamicTracking/NewsEventsTab/utils.ts
+// 新闻动态 - 工具函数
+
+import type { IconType } from 'react-icons';
+import {
+  FaNewspaper,
+  FaBullhorn,
+  FaGavel,
+  FaFlask,
+  FaDollarSign,
+  FaShieldAlt,
+  FaFileAlt,
+  FaIndustry,
+} from 'react-icons/fa';
+import type { ThemeConfig, BadgeStyle } from './types';
+
+/**
+ * 事件类型图标映射
+ */
+const EVENT_TYPE_ICONS: Record<string, IconType> = {
+  企业公告: FaBullhorn,
+  政策: FaGavel,
+  技术突破: FaFlask,
+  企业融资: FaDollarSign,
+  政策监管: FaShieldAlt,
+  政策动态: FaFileAlt,
+  行业事件: FaIndustry,
+};
+
+/**
+ * 获取事件类型对应的图标
+ */
+export const getEventTypeIcon = (eventType?: string): IconType => {
+  if (!eventType) return FaNewspaper;
+  return EVENT_TYPE_ICONS[eventType] || FaNewspaper;
+};
+
+/**
+ * 获取重要性徽章样式
+ */
+export const getImportanceBadgeStyle = (
+  importance: string | undefined,
+  theme: ThemeConfig,
+  isBlackGold: boolean
+): BadgeStyle => {
+  if (isBlackGold) {
+    const styles: Record<string, BadgeStyle> = {
+      S: theme.badgeS,
+      A: theme.badgeA,
+      B: theme.badgeB,
+      C: theme.badgeC,
+    };
+    return styles[importance || ''] || { bg: 'rgba(107, 114, 128, 0.2)', color: '#9CA3AF' };
+  }
+
+  // 默认主题使用 colorScheme
+  const colorMap: Record<string, string> = {
+    S: 'red',
+    A: 'orange',
+    B: 'yellow',
+    C: 'green',
+  };
+  return { colorScheme: colorMap[importance || ''] || 'gray', bg: '', color: '' };
+};
+
+/**
+ * 格式化日期
+ */
+export const formatDate = (dateStr?: string): string => {
+  if (!dateStr) return '';
+  return new Date(dateStr).toLocaleDateString('zh-CN', {
+    year: 'numeric',
+    month: '2-digit',
+    day: '2-digit',
+  });
+};
+
+/**
+ * 格式化涨跌幅
+ */
+export const formatChange = (value: number | null | undefined): string => {
+  if (value === null || value === undefined) return '-';
+  const prefix = value > 0 ? '+' : '';
+  return `${prefix}${value.toFixed(2)}%`;
+};
+
+/**
+ * 获取涨跌幅颜色
+ */
+export const getChangeColor = (value: number | null | undefined): string => {
+  if (value === null || value === undefined) return '#9CA3AF';
+  return value > 0 ? '#EF4444' : '#10B981';
+};
+
+/**
+ * 提取关键词显示文本
+ */
+export const getKeywordText = (keyword: string | { concept?: string; name?: string }): string => {
+  if (typeof keyword === 'string') return keyword;
+  return keyword?.concept || keyword?.name || '未知';
+};