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Create a local HTML preview page that renders a provided article as WeChat-compatible rich HTML and includes a “复制 HTML” button. Preserve the article's meaning and content; only make light structural adjustments for layout readability.

Workflow

1. Collect the article
   • If the user has not provided the article, ask them to paste it.
   • Detect title from the first # heading or first strong title-like line. If unclear, ask for a title.