feat: improve copy-paste behavior#301
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data-md round trip and markdown-shaped plain text
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Copying now writes standard semantic HTML (real
<h3>/<ol><li>/<strong>) with the markdown source preserved indata-mdattributes, plus a markdown-shapedtext/plainwhose inline layer follows the mark mode (hide strips the syntax characters, focus and show keep the full source). Pasting routes by signature: meowdown's own clipboard HTML parses natively and byte-exact, foreign HTML (including other ProseMirror editors) converts through markdown, and plain text follows markdown newline semantics (aaa\n\nbbbno longer inserts an empty paragraph) while Shift-paste keeps ProseMirror's default line splitting. The whole pipeline now ships insidedefineEditorExtension, replacingdefineMarkdownCopyand the react-leveldefineHTMLPastewiring.