The admin article preview iframe was missing Leaflet CSS/JS and had
scripts blocked by the sandbox policy, so map shortcodes rendered as
empty divs.
- Extract inline map script to static/js/article-maps.js (shared
between article_detail.html and admin preview)
- Replace f-string preview doc with a proper Jinja template that
includes Leaflet assets
- Add allow-scripts to iframe sandbox on both initial load and HTMX
preview updates
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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