feat: raw HTML block support

[ocavue]

Adds a dedicated htmlBlock node so raw HTML in Markdown (elements, comments, processing instructions) round-trips byte-exact and no longer has its inner Markdown mis-parsed. Element blocks render a DOMPurify-sanitized live preview stacked above the editable source (the caret reveals the source, like the math block); comments and other non-visual blocks stay source-only, and renderHTMLPreview={false} shows every block as source. This replaces the old invisible htmlComment node (breaking).

[vercel]

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Project	Deployment	Actions	Updated (UTC)
meowdown	Ready	Preview, Comment	Jul 7, 2026 6:35pm

[pkg-pr-new]

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npm i https://pkg.pr.new/prosekit/meowdown/@meowdown/core@260

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commit: 7830036

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	94.05%	3464 / 3683
🔵	Statements	91.72%	3858 / 4206
🔵	Functions	91.82%	831 / 905
🔵	Branches	85.61%	2310 / 2698

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/core/src/index.ts	0%	0%	0%	0%
packages/core/src/style.css	0%	0%	0%	0%
packages/core/src/converters/md-to-pm.ts	98.22%	86.12%	100%	99.2%	147-149, 193, 256, 267
packages/core/src/converters/pm-to-md.ts	96.25%	90.76%	100%	98.23%	49, 116, 251-252, 270-271, 290, 461, 478
packages/core/src/extensions/code-block-highlight.ts	87.03%	75%	100%	93.18%	27, 44-46, 120, 123, 124
packages/core/src/extensions/extension.ts	100%	100%	100%	100%
packages/core/src/extensions/html-block.ts	91.22%	80%	100%	97.77%	124, 127, 131, 139, 153
packages/core/src/extensions/node-names.ts	100%	100%	100%	100%
packages/react/src/components/editor.tsx	80.95%	70.58%	77.77%	80.95%	327, 357-363
packages/react/src/components/html-block-render.tsx	91.66%	33.33%	100%	100%	33
packages/react/src/components/html-block-view.module.css	0%	0%	0%	0%
packages/react/src/components/html-block-view.module.d.css.ts	0%	0%	0%	0%
packages/react/src/components/html-block-view.tsx	96%	88.23%	100%	100%	39
packages/react/src/components/markdown-view.tsx	93.86%	80%	93.33%	98.63%	127, 131, 177, 211, 213, 268, 282, 393, 403, 450
packages/react/src/components/prosekit-editor.tsx	95.58%	90.38%	91.3%	96.72%	276, 321-324
packages/react/src/extensions/html-block-view.tsx	100%	100%	100%	100%
packages/react/src/utils/sanitize-html.ts	100%	100%	100%	100%

Generated in workflow #1101 for commit 7830036 by the Vitest Coverage Report Action