refactor: CompanyOverview 组件 TypeScript 拆分

- 新增 index.tsx: 主组件（组合层，50 行）
- 新增 CompanyHeaderCard.tsx: 头部卡片组件（168 行）
- 新增 hooks/useCompanyOverviewData.ts: 数据加载 Hook
- 删除 index.js: 原 330 行代码精简 85%
- 修复 Company/index.js: 恢复 CompanyTabs 渲染

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

src/views/Company/components/CompanyOverview/index.tsx

@@ -0,0 +1,70 @@
+// src/views/Company/components/CompanyOverview/index.tsx
+// 公司概览 - 主组件（组合层）
+
+import React from "react";
+import { VStack, Spinner, Center, Text } from "@chakra-ui/react";
+
+import { useCompanyOverviewData } from "./hooks/useCompanyOverviewData";
+import CompanyHeaderCard from "./CompanyHeaderCard";
+import type { CompanyOverviewProps } from "./types";
+
+// 子组件（暂保持 JS）
+import BasicInfoTab from "./BasicInfoTab";
+
+/**
+ * 公司概览组件
+ *
+ * 功能：
+ * - 显示公司头部信息卡片
+ * - 显示基本信息（股权结构、管理层、公告等）
+ */
+const CompanyOverview: React.FC<CompanyOverviewProps> = ({ stockCode }) => {
+  const {
+    basicInfo,
+    actualControl,
+    concentration,
+    management,
+    topCirculationShareholders,
+    topShareholders,
+    branches,
+    announcements,
+    disclosureSchedule,
+    loading,
+  } = useCompanyOverviewData(stockCode);
+
+  // 加载状态
+  if (loading && !basicInfo) {
+    return (
+      <Center h="300px">
+        <VStack spacing={4}>
+          <Spinner size="xl" color="blue.500" thickness="4px" />
+          <Text>正在加载公司概览数据...</Text>
+        </VStack>
+      </Center>
+    );
+  }
+
+  return (
+    <VStack spacing={6} align="stretch">
+      {/* 公司头部信息卡片 */}
+      {basicInfo && <CompanyHeaderCard basicInfo={basicInfo} />}
+
+      {/* 基本信息内容 */}
+      <BasicInfoTab
+        basicInfo={basicInfo}
+        actualControl={actualControl}
+        concentration={concentration}
+        topShareholders={topShareholders}
+        topCirculationShareholders={topCirculationShareholders}
+        management={management}
+        announcements={announcements}
+        branches={branches}
+        disclosureSchedule={disclosureSchedule}
+        cardBg="white"
+        loading={loading}
+      />
+    </VStack>
+  );
+};
+
+export default CompanyOverview;