style(TradeDatePicker): 支持标签字体大小配置

- theme.ts: SIZE_CONFIG 添加 labelFontSize 配置
- types.ts: SizeConfig 类型添加 labelFontSize 字段
- index.tsx: DateLabel 组件使用 fontSize prop

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

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

src/components/TradeDatePicker/index.tsx

@@ -18,12 +18,16 @@ const DateLabel = memo<{
   showIcon: boolean;
   iconSize: number;
   spacing: number;
-}>(({ label, showIcon, iconSize, spacing }) => (
+  labelColor?: string;
+  fontSize?: string;
+}>(({ label, showIcon, iconSize, spacing, labelColor, fontSize }) => (
   <HStack spacing={spacing}>
     {showIcon && <Icon as={Calendar} color={COLORS.icon} boxSize={iconSize} />}
-    <Text fontWeight="bold" color={COLORS.label}>
-      {label}：
-    </Text>
+    {label && (
+      <Text fontWeight="bold" color={labelColor || COLORS.label} fontSize={fontSize}>
+        {label}
+      </Text>
+    )}
   </HStack>
 ));
 DateLabel.displayName = 'DateLabel';
@@ -62,6 +66,7 @@ const TradeDatePicker: React.FC<TradeDatePickerProps> = ({
   showIcon = true,
   showLatestTradeDateTip = true,
   size = 'md',
+  labelColor,
 }) => {
   const sizeConfig = SIZE_CONFIG[size];
 
@@ -99,6 +104,8 @@ const TradeDatePicker: React.FC<TradeDatePickerProps> = ({
         showIcon={showIcon}
         iconSize={sizeConfig.iconSize}
         spacing={sizeConfig.spacing}
+        labelColor={labelColor}
+        fontSize={sizeConfig.labelFontSize}
       />
 
       <Input

src/components/TradeDatePicker/theme.ts

@@ -18,12 +18,14 @@ export const SIZE_CONFIG = {
   sm: {
     inputHeight: '32px',
     fontSize: 'sm',
+    labelFontSize: 'xs',
     iconSize: 4,
     spacing: 2,
   },
   md: {
     inputHeight: '40px',
     fontSize: 'md',
+    labelFontSize: 'sm',
     iconSize: 5,
     spacing: 3,
   },

src/components/TradeDatePicker/types.ts

@@ -28,4 +28,6 @@ export interface TradeDatePickerProps {
   showLatestTradeDateTip?: boolean;
   /** 尺寸：sm | md */
   size?: 'sm' | 'md';
+  /** 标签颜色 */
+  labelColor?: string;
 }