Add a Markdown editor for post bodies with a formatting toolbar
(bold/italic/headings/lists/code/link/image) and a live Write/Preview
toggle. The body still submits as a plain field so saving works without
JS.
Add a per-post downloads section: upload files to the blog or attach
external links. Uploads POST to /admin/upload (admin-guarded, sanitized
names, 200MB cap), are stored under data/uploads, and served back via the
/uploads/[name] route. Downloads render on the post page with file vs link
icons and sizes, and are carried through export/import.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
