fix(admin-web): make article copy robust

apps/admin-web/src/lib/article-list-actions.ts

@@ -72,8 +72,27 @@ export function resolveArticleActionState(
 export function buildArticleClipboardContent(
   detail: Pick<ArticleDetail, 'title' | 'markdown_content'>,
 ): string {
-  return [detail.title ? `# ${detail.title}` : '', detail.markdown_content ?? '']
-    .filter(Boolean)
-    .join('\n\n')
-    .trim()
+  const title = detail.title?.trim() ?? ''
+  const markdown = detail.markdown_content?.trim() ?? ''
+
+  if (!title) {
+    return markdown
+  }
+
+  if (!markdown) {
+    return `# ${title}`
+  }
+
+  if (getLeadingH1Text(markdown) === title) {
+    return markdown
+  }
+
+  return [`# ${title}`, markdown].join('\n\n').trim()
+}
+
+function getLeadingH1Text(markdown: string): string | null {
+  const normalizedMarkdown = markdown.replace(/^\uFEFF/, '').trimStart()
+  const firstLine = normalizedMarkdown.split(/\r?\n/, 1)[0]?.trim() ?? ''
+  const match = firstLine.match(/^#\s+(.+?)\s*#*$/)
+  return match?.[1]?.trim() ?? null
 }