refactor(Company): 提取共享的 useStockSearch Hook

- 新增 useStockSearch.ts：统一股票模糊搜索逻辑
  - 支持按代码或名称搜索
  - 支持排除指定股票（用于对比场景）
  - 使用 useMemo 优化性能
- 重构 SearchBar.js：使用共享 Hook，减少 15 行代码
- 重构 CompareStockInput.tsx：使用共享 Hook，减少 20 行代码

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

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

src/views/Company/components/CompanyHeader/SearchBar.js

@@ -13,6 +13,7 @@ import {
   VStack,
 } from '@chakra-ui/react';
 import { SearchIcon } from '@chakra-ui/icons';
+import { useStockSearch } from '../../hooks/useStockSearch';
 
 /**
  * 股票搜索栏组件（带模糊搜索下拉）
@@ -31,27 +32,18 @@ const SearchBar = ({
 }) => {
   // 下拉状态
   const [showDropdown, setShowDropdown] = useState(false);
-  const [filteredStocks, setFilteredStocks] = useState([]);
   const containerRef = useRef(null);
 
   // 从 Redux 获取全部股票列表
   const allStocks = useSelector(state => state.stock.allStocks);
 
-  // 模糊搜索过滤
+  // 使用共享的搜索 Hook
+  const filteredStocks = useStockSearch(allStocks, inputCode, { limit: 10 });
+
+  // 根据搜索结果更新下拉显示状态
   useEffect(() => {
-    if (inputCode && inputCode.trim()) {
-      const searchTerm = inputCode.trim().toLowerCase();
-      const filtered = allStocks.filter(stock =>
-        stock.code.toLowerCase().includes(searchTerm) ||
-        stock.name.includes(inputCode.trim())
-      ).slice(0, 10); // 限制显示10条
-      setFilteredStocks(filtered);
-      setShowDropdown(filtered.length > 0);
-    } else {
-      setFilteredStocks([]);
-      setShowDropdown(false);
-    }
-  }, [inputCode, allStocks]);
+    setShowDropdown(filteredStocks.length > 0 && !!inputCode?.trim());
+  }, [filteredStocks, inputCode]);
 
   // 点击外部关闭下拉
   useEffect(() => {

src/views/Company/components/StockQuoteCard/components/CompareStockInput.tsx

@@ -18,6 +18,7 @@ import {
 } from '@chakra-ui/react';
 import { SearchIcon } from '@chakra-ui/icons';
 import { BarChart2 } from 'lucide-react';
+import { useStockSearch, type Stock } from '../../../hooks/useStockSearch';
 
 interface CompareStockInputProps {
   onCompare: (stockCode: string) => void;
@@ -25,11 +26,6 @@ interface CompareStockInputProps {
   currentStockCode?: string;
 }
 
-interface Stock {
-  code: string;
-  name: string;
-}
-
 interface RootState {
   stock: {
     allStocks: Stock[];
@@ -43,7 +39,6 @@ const CompareStockInput: React.FC<CompareStockInputProps> = ({
 }) => {
   const [inputValue, setInputValue] = useState('');
   const [showDropdown, setShowDropdown] = useState(false);
-  const [filteredStocks, setFilteredStocks] = useState<Stock[]>([]);
   const [selectedStock, setSelectedStock] = useState<Stock | null>(null);
   const containerRef = useRef<HTMLDivElement>(null);
 
@@ -55,25 +50,16 @@ const CompareStockInput: React.FC<CompareStockInputProps> = ({
   const goldColor = '#F4D03F';
   const bgColor = '#1A202C';
 
-  // 模糊搜索过滤
+  // 使用共享的搜索 Hook（排除当前股票）
+  const filteredStocks = useStockSearch(allStocks, inputValue, {
+    excludeCode: currentStockCode,
+    limit: 8,
+  });
+
+  // 根据搜索结果更新下拉显示状态
   useEffect(() => {
-    if (inputValue && inputValue.trim()) {
-      const searchTerm = inputValue.trim().toLowerCase();
-      const filtered = allStocks
-        .filter(
-          (stock) =>
-            stock.code !== currentStockCode && // 排除当前股票
-            (stock.code.toLowerCase().includes(searchTerm) ||
-              stock.name.includes(inputValue.trim()))
-        )
-        .slice(0, 8); // 限制显示8条
-      setFilteredStocks(filtered);
-      setShowDropdown(filtered.length > 0);
-    } else {
-      setFilteredStocks([]);
-      setShowDropdown(false);
-    }
-  }, [inputValue, allStocks, currentStockCode]);
+    setShowDropdown(filteredStocks.length > 0 && !!inputValue?.trim());
+  }, [filteredStocks, inputValue]);
 
   // 点击外部关闭下拉
   useEffect(() => {

src/views/Company/hooks/useStockSearch.ts

@@ -0,0 +1,59 @@
+/**
+ * useStockSearch - 股票模糊搜索 Hook
+ *
+ * 提取自 SearchBar.js 和 CompareStockInput.tsx 的共享搜索逻辑
+ * 支持按代码或名称搜索，可选排除指定股票
+ */
+
+import { useMemo } from 'react';
+
+export interface Stock {
+  code: string;
+  name: string;
+}
+
+interface UseStockSearchOptions {
+  excludeCode?: string;
+  limit?: number;
+}
+
+/**
+ * 股票模糊搜索 Hook
+ *
+ * @param allStocks - 全部股票列表
+ * @param searchTerm - 搜索关键词
+ * @param options - 可选配置
+ * @param options.excludeCode - 排除的股票代码（用于对比场景）
+ * @param options.limit - 返回结果数量限制，默认 10
+ * @returns 过滤后的股票列表
+ */
+export const useStockSearch = (
+  allStocks: Stock[],
+  searchTerm: string,
+  options: UseStockSearchOptions = {}
+): Stock[] => {
+  const { excludeCode, limit = 10 } = options;
+
+  return useMemo(() => {
+    const trimmed = searchTerm?.trim();
+    if (!trimmed) return [];
+
+    const term = trimmed.toLowerCase();
+
+    return allStocks
+      .filter((stock) => {
+        // 排除指定股票
+        if (excludeCode && stock.code === excludeCode) {
+          return false;
+        }
+        // 按代码或名称匹配
+        return (
+          stock.code.toLowerCase().includes(term) ||
+          stock.name.includes(trimmed)
+        );
+      })
+      .slice(0, limit);
+  }, [allStocks, searchTerm, excludeCode, limit]);
+};
+
+export default useStockSearch;