优化页面数据加载并完善多语言 SEO、新闻回退、主题首屏及自动化回归测试

src/components/news/news-detail-client.tsx

@@ -5,13 +5,9 @@ import { markdownToHtml } from "@/lib/markdown";
 import { PageBreadcrumb } from "@/components/layout/page-breadcrumb";
 import { NewsShare } from "@/components/news/news-share";
 
-export function NewsDetailClient({ item, locale }: { item: NewsItem | null; locale: Locale }) {
+export function NewsDetailClient({ item, locale }: { item: NewsItem; locale: Locale }) {
   const messages = getLocaleMessages(locale);
 
-  if (!item) {
-    return <main className="news-detail-page"><div className="news-detail-inner"><p>未找到该文章。</p><Link href={withLocale("/news", locale)}>{messages.common.backToNews}</Link></div></main>;
-  }
-
   return (
     <main className="news-detail-page">
       <div className="news-detail-inner">
@@ -20,7 +16,7 @@ export function NewsDetailClient({ item, locale }: { item: NewsItem | null; loca
           <p className="news-detail-tag">{item.category}</p>
           <h1>{item.title}</h1>
           <time>{item.date}</time>
-          {locale !== "zh-Hans" && <div className="news-detail-ai-banner" aria-label="AI translated content">{getAiTranslationNotice(locale)}</div>}
+          {item.contentLocale !== "zh-Hans" && <div className="news-detail-ai-banner" aria-label="AI translated content">{getAiTranslationNotice(locale)}</div>}
           <div className="news-detail-cover" style={{ backgroundImage: `url(${item.cover})` }} />
           <div className="news-detail-body" dangerouslySetInnerHTML={{ __html: markdownToHtml(item.body) }} />
           <NewsShare title={item.title} />