giles 4ede0368dc Add admin preview views + fix markdown converter ...

- Fix _markdown() in lexical_to_sx.py: render markdown to HTML with
  mistune.html() before storing in ~kg-html
- Add shared/sx/prettify.py: sx_to_pretty_sx and json_to_pretty_sx
  produce sx AST for syntax-highlighted DOM (uses canonical serialize())
- Add preview tab to admin header nav
- Add GET /preview/ route with 4 views: prettified sx, prettified
  lexical JSON, sx rendered HTML, lexical rendered HTML
- Add ~blog-preview-panel and ~blog-preview-section components
- Add syntax highlight CSS for sx/JSON tokens

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-02 00:50:57 +00:00

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