Replace the auto-escaped `{{ body_html }}` div (showed raw HTML tags)
with a sandboxed `<iframe srcdoc>` pattern matching the email preview.
Both the initial page load and the HTMX live-update endpoint now build
a full `preview_doc` document embedding the public CSS and wrapping
content in `<div class="article-body">` — pixel-perfect against the
live article, admin styles fully isolated.
Also:
- Delete ~65 lines of redundant `.preview-body` custom CSS
- Add "Meta ▾" toolbar toggle to collapse/expand metadata strip
- Add word count footer in the editor pane (updates on input)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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