fix(ci): normalize directory casing to lowercase for Linux CI

macOS is case-insensitive but Linux CI is case-sensitive.
Git was tracking uppercase Layout/Text/Media but imports used lowercase.
Renamed via git mv to make both consistent (lowercase).

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

packages/components/src/text/Subhead.tsx

@@ -0,0 +1,54 @@
+'use client';
+import React, { ReactNode, CSSProperties } from 'react';
+import { visualWeights, resolveFontSize } from '@newspaperui/theme';
+import { clampSpan, cx } from '@newspaperui/utils';
+import { useSection } from '../layout/Section';
+
+export interface SubheadProps {
+  weight?: 'High' | 'Medium';
+  span?: number;
+  as?: 'h2' | 'h3' | 'h4' | 'p';
+  className?: string;
+  style?: CSSProperties;
+  children: ReactNode;
+}
+
+/**
+ * Subhead — 副标题（italic 衬线）
+ *
+ * - 默认 italic 衬线风格，视觉层级低于 Headline
+ * - 支持 High/Medium 两档 weight
+ * - 可通过 as 指定渲染标签（h2/h3/h4/p）
+ *
+ * @example
+ * <Subhead weight="Medium" span={14}>
+ *   A deeper look into the story behind the headlines
+ * </Subhead>
+ */
+export const Subhead: React.FC<SubheadProps> = ({
+  weight = 'Medium', span, as = 'p', className, style, children,
+}) => {
+  const section = useSection();
+  const config = visualWeights.Subhead[weight]!;
+  const Tag = as as keyof JSX.IntrinsicElements;
+  const cols = span ? clampSpan(span, section.columns) : undefined;
+  return (
+    <Tag
+      className={cx('nui-subhead nui-osf', className)}
+      style={{
+        fontFamily: `var(${config.fontFamily})`,
+        fontSize: resolveFontSize(config.fontSize),
+        fontWeight: config.fontWeight,
+        fontStyle: config.fontStyle,
+        lineHeight: config.lineHeight,
+        color: `var(${config.color})`,
+        margin: config.margin,
+        gridColumn: cols ? `span ${cols}` : undefined,
+        ...style,
+      }}
+      data-weight={weight}
+    >
+      {children}
+    </Tag>
+  );
+};