perf(hooks): 使用 useRef 缓存加载状态，避免 Tab 切换重复请求

- 使用 useRef 替代 useState 跟踪 hasLoaded 状态
- Tab 切换回来时保持数据缓存，不重新发起请求
- stockCode 变化时重置加载状态，确保新股票正常加载
- useAnnouncementsData 支持 refreshKey 强制刷新

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

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

src/views/Company/components/CompanyOverview/hooks/useShareholderData.ts

@@ -1,7 +1,7 @@
 // src/views/Company/components/CompanyOverview/hooks/useShareholderData.ts
 // 股权结构数据 Hook - 用于股权结构 Tab
 
-import { useState, useEffect } from "react";
+import { useState, useEffect, useRef } from "react";
 import { logger } from "@utils/logger";
 import axios from "@utils/axiosConfig";
 import type { ActualControl, Concentration, Shareholder } from "../types";
@@ -42,7 +42,10 @@ export const useShareholderData = (options: UseShareholderDataOptions): UseShare
   const [topCirculationShareholders, setTopCirculationShareholders] = useState<Shareholder[]>([]);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
-  const [hasLoaded, setHasLoaded] = useState(false);
+  // 使用 ref 跟踪是否已加载，避免 Tab 切换时重复请求
+  const hasLoadedRef = useRef(false);
+  // 记录上次加载的 stockCode，stockCode 变化时需要重新加载
+  const lastStockCodeRef = useRef<string | undefined>(undefined);
 
   useEffect(() => {
     // 只有 enabled 且有 stockCode 时才请求
@@ -51,6 +54,18 @@ export const useShareholderData = (options: UseShareholderDataOptions): UseShare
       return;
     }
 
+    // stockCode 变化时重置加载状态
+    if (lastStockCodeRef.current !== stockCode) {
+      hasLoadedRef.current = false;
+      lastStockCodeRef.current = stockCode;
+    }
+
+    // 如果已经加载过数据，不再重新请求（Tab 切换回来时保持缓存）
+    if (hasLoadedRef.current) {
+      setLoading(false);
+      return;
+    }
+
     const controller = new AbortController();
 
     const loadData = async () => {
@@ -75,7 +90,7 @@ export const useShareholderData = (options: UseShareholderDataOptions): UseShare
         if (shareholdersRes.success) setTopShareholders(shareholdersRes.data);
         if (circulationRes.success) setTopCirculationShareholders(circulationRes.data);
         setLoading(false);
-        setHasLoaded(true);
+        hasLoadedRef.current = true;
       } catch (err: any) {
         // 请求被取消时，不更新任何状态
         if (err.name === "CanceledError") {
@@ -84,7 +99,7 @@ export const useShareholderData = (options: UseShareholderDataOptions): UseShare
         logger.error("useShareholderData", "loadData", err, { stockCode });
         setError("加载股权结构数据失败");
         setLoading(false);
-        setHasLoaded(true);
+        hasLoadedRef.current = true;
       }
     };
 
@@ -92,7 +107,7 @@ export const useShareholderData = (options: UseShareholderDataOptions): UseShare
     return () => controller.abort();
   }, [stockCode, enabled]);
 
-  const isLoading = loading || (enabled && !hasLoaded && !error);
+  const isLoading = loading || (enabled && !hasLoadedRef.current && !error);
 
   return {
     actualControl,