Jakub Zych 086e485215 feat(editor): preservation schema, block reuse, toolbar, uploads and embeds ...

- preservationExtensions: raw HTML cards for unmodelled blocks (shown as
  text), figure with figcaption, the YouTube embed placeholder node, span
  marks, a global attribute map (never on* handlers), tables without
  colgroup or min-width, inline images without base64
- serializeDocument keeps the original bytes of every top-level block still
  equal to the loaded one, so editing one paragraph changes only that
  paragraph; tables serialize with thead and bare cell text
- Links accept only http, https, mailto and relative URLs (isPolicyUrl, the
  rule both sanitizer policies apply) and gain no target, rel or class
- Toolbar with headings, marks, lists, links, blockquote, table editing,
  images, embeds, raw HTML block, undo and redo; en and pl labels
- Images from the picker or a drop go out as summer-upload and are inserted
  on summer-upload-result with alt text and an optional caption
- editor-corpus.json: the editor own output, rebuilt and checked by
  corpus.test.ts (UPDATE_CORPUS=1 rewrites it) for the policy tests
- README Blog Editor section

2026-10-10 11:53:07 +02:00

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