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Add header folding in markdown preview#3796
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Summary
Fixes #2195
Verification
./node_modules/.bin/jest tests/lib/preview-header-folding.test.js --runInBand./node_modules/.bin/eslint browser/components/MarkdownPreview.js browser/lib/previewHeaderFolding.js tests/lib/preview-header-folding.test.js(exit 0; existing ReactDOM.render deprecation warning)./node_modules/.bin/prettier --check browser/components/MarkdownPreview.js browser/lib/previewHeaderFolding.js tests/lib/preview-header-folding.test.jsgit diff --checkNote: full Jest and AVA are blocked locally under Node v25.8.2 by the legacy localStorage/browser-env setup before reaching this change.