refactor(Company): 统一所有 Tab 的 loading 状态组件

- 创建共享的 LoadingState 组件（黑金主题）
- DeepAnalysisTab: 使用统一 LoadingState 替换蓝色 Spinner
- FinancialPanorama: 使用 LoadingState 替换 Skeleton
- MarketDataView: 使用 LoadingState 替换自定义 Spinner
- ForecastReport: 使用 LoadingState 替换 Skeleton 骨架屏

所有一级 Tab 现在使用一致的金色 Spinner + 加载提示文案

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

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

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

@@ -6,7 +6,6 @@ import {
   Box,
   Container,
   CardBody,
-  Spinner,
   Center,
   VStack,
   Text,
@@ -39,6 +38,7 @@ import {
   UnusualPanel,
   PledgePanel,
 } from './components/panels';
+import LoadingState from '../LoadingState';
 import type { MarketDataViewProps, RiseAnalysis } from './types';
 
 /**
@@ -163,18 +163,7 @@ const MarketDataView: React.FC<MarketDataViewProps> = ({ stockCode: propStockCod
           {loading ? (
             <ThemedCard theme={theme}>
               <CardBody>
-                <Center h="400px">
-                  <VStack spacing={4}>
-                    <Spinner
-                      thickness="4px"
-                      speed="0.65s"
-                      emptyColor={theme.bgDark}
-                      color={theme.primary}
-                      size="xl"
-                    />
-                    <Text color={theme.textSecondary}>数据加载中...</Text>
-                  </VStack>
-                </Center>
+                <LoadingState message="数据加载中..." height="400px" />
               </CardBody>
             </ThemedCard>
           ) : (