fix: 个股中心页面日期数据源统一

- fetchTopConcepts: 始终设置 selectedDate 和 availableDates
- fetchHeatmapData: 移除 setSelectedDate
- fetchMarketStats: 移除 setSelectedDate 和 setAvailableDates
- 新增 src/data/tradingDays.json: 交易日历数据（从 tdays.csv 转换）
- availableDates 基于交易日历生成，确保日期列表完整且包含最新日期

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

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

src/views/StockOverview/index.js

@@ -59,7 +59,11 @@ import { FaChartLine, FaFire, FaRocket, FaBrain, FaCalendarAlt, FaChevronRight,
 import { BsGraphUp, BsLightningFill } from 'react-icons/bs';
 import * as echarts from 'echarts';
 import { logger } from '../../utils/logger';
+import tradingDays from '../../data/tradingDays.json';
 import { useStockOverviewEvents } from './hooks/useStockOverviewEvents';
+
+// 交易日 Set，用于快速查找
+const tradingDaysSet = new Set(tradingDays);
 // Navigation bar now provided by MainLayout
 // import HomeNavbar from '../../components/Navbars/HomeNavbar';
 
@@ -173,7 +177,27 @@ const StockOverview = () => {
 
       if (data.success) {
         setTopConcepts(data.data);
-        if (!selectedDate) setSelectedDate(data.trade_date);
+        // 使用概念接口的日期作为统一数据源（数据最新）
+        setSelectedDate(data.trade_date);
+        // 基于交易日历生成可选日期列表
+        if (data.trade_date && tradingDays.length > 0) {
+          // 找到当前日期或最近的交易日
+          let targetDate = data.trade_date;
+          if (!tradingDaysSet.has(data.trade_date)) {
+            for (let i = tradingDays.length - 1; i >= 0; i--) {
+              if (tradingDays[i] <= data.trade_date) {
+                targetDate = tradingDays[i];
+                break;
+              }
+            }
+          }
+          const idx = tradingDays.indexOf(targetDate);
+          if (idx !== -1) {
+            const startIdx = Math.max(0, idx - 19);
+            const dates = tradingDays.slice(startIdx, idx + 1).reverse();
+            setAvailableDates(dates);
+          }
+        }
         logger.debug('StockOverview', '热门概念加载成功', {
           count: data.data?.length || 0,
           date: data.trade_date
@@ -204,7 +228,7 @@ const StockOverview = () => {
             falling_count: data.statistics.falling_count
           }));
         }
-        if (!selectedDate) setSelectedDate(data.trade_date);
+        // 日期由 fetchTopConcepts 统一设置，这里不再设置
         logger.debug('StockOverview', '热力图数据加载成功', {
           count: data.data?.length || 0,
           date: data.trade_date
@@ -235,11 +259,9 @@ const StockOverview = () => {
           date: data.trade_date
         };
         setMarketStats(newStats);
-        setAvailableDates(data.available_dates || []);
-        if (!selectedDate) setSelectedDate(data.trade_date);
+        // 日期和可选日期列表由 fetchTopConcepts 统一设置，这里不再设置
         logger.debug('StockOverview', '市场统计数据加载成功', {
-          date: data.trade_date,
-          availableDatesCount: data.available_dates?.length || 0
+          date: data.trade_date
         });
 
         // 🎯 追踪市场统计数据查看