feat: complete newspaperui component library with docs site

- 18 React components (Layout/Section/Article/Layer/Masthead/Rule +
  Headline/Subhead/Kicker/BodyText/Quote/Byline/Dateline/Caption +
  Image/Figure/Video/PullQuote)
- Theme: warm off-white palette, Source Serif 4 / Cormorant Garamond /
  Inter / Noto Serif SC/JP, visual weight mapping, dark mode
- Docs: Landing page, 6 Blocks (zh/en/jp), component API docs
- GitHub Pages deployment via static export

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

packages/components/src/Text/Byline.tsx

@@ -9,6 +9,16 @@ export interface BylineProps {
   children: ReactNode;          // e.g. "BY ALICE SMITH"
 }
 
+/**
+ * Byline — 署名（Inter small-caps）
+ *
+ * - Inter 字体 + OpenType small-caps 特性
+ * - 用于文章作者署名，通常置于标题下方
+ * - 字号、字重、间距由 visualWeights 数据驱动
+ *
+ * @example
+ * <Byline>BY ALICE SMITH</Byline>
+ */
 export const Byline: React.FC<BylineProps> = ({ className, style, children }) => {
   const config = visualWeights.Byline.Standard!;
   return (