refactor: 移除暗色模式相关代码，使用固定浅色主题

- DeepAnalysisTab: 移除 useColorModeValue，使用固定颜色值
- NewsEventsTab: 移除 useColorModeValue，简化 hover 颜色
- FinancialPanorama: 移除 useColorMode/useColorModeValue
- MarketDataView: 移除 dark 主题配置，简化颜色逻辑
- StockQuoteCard: 移除 useColorModeValue，使用固定颜色

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

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

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

@@ -16,7 +16,6 @@ import {
   Badge,
   Progress,
   Skeleton,
-  useColorModeValue,
 } from '@chakra-ui/react';
 
 import type { StockQuoteCardProps } from './types';
@@ -53,11 +52,11 @@ const StockQuoteCard: React.FC<StockQuoteCardProps> = ({
   isLoading = false,
 }) => {
   // 颜色配置
-  const cardBg = useColorModeValue('white', 'gray.800');
-  const borderColor = useColorModeValue('gray.200', 'gray.700');
-  const labelColor = useColorModeValue('gray.500', 'gray.400');
-  const valueColor = useColorModeValue('gray.800', 'gray.100');
-  const sectionTitleColor = useColorModeValue('gray.600', 'gray.300');
+  const cardBg = 'white';
+  const borderColor = 'gray.200';
+  const labelColor = 'gray.500';
+  const valueColor = 'gray.800';
+  const sectionTitleColor = 'gray.600';
 
   // 涨跌颜色
   const priceColor = data.changePercent >= 0 ? 'green.500' : 'red.500';