fix(StockChart): 图表组件使用 aspect-ratio 保持宽高比，统一弹窗大小

- KLineChartModal: 日K线图使用 aspectRatio 替代固定高度
- StockChartKLineModal: K线图高度改为响应式 min(400px, 60vh)
- TimelineChartModal: 分时图弹窗大小与日K线统一，maxWidth: 1400px

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

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

src/components/StockChart/StockChartKLineModal.tsx

@@ -251,7 +251,8 @@ const StockChartKLineModal: React.FC<StockChartKLineModalProps> = ({
           id={`kline-chart-${stock.stock_code}`}
           style={{
             width: '100%',
-            height: `${CHART_HEIGHTS.main}px`,
+            minHeight: '300px',
+            height: 'min(400px, 60vh)',
             opacity: showLoading ? 0.5 : 1,
             transition: 'opacity 0.3s',
           }}