fix: parse indented raw html children in html blocks

[atinux]

Why

Indented raw HTML children inside an open HTML block could be tokenized as markdown code blocks.

<p align="center">
  <a href="https://cdn.jsdelivr.net/gh/antfu/static/sponsors.svg">
    <img src="https://cdn.jsdelivr.net/gh/antfu/static/sponsors.svg" alt="Sponsors"/>
  </a>
</p>

was creating:

[
  [
    "p",
    { "$": { "html": 1, "block": 1 }, "align": "center" },
    [
      "a",
      {
        "$": { "html": 1, "block": 1 },
        "href": "https://cdn.jsdelivr.net/gh/antfu/static/sponsors.svg"
      }
    ],
    [
      "pre",
      {},
      [
        "code",
        {},
        "<img src=\"https://cdn.jsdelivr.net/gh/antfu/static/sponsors.svg\" alt=\"Sponsors\"/>"
      ]
    ]
  ],
  ["component", {}]
]

What

• Process multiline html_block tokens through one HTML-aware path.
• Reinterpret HTML-looking code_block tokens as raw HTML only while inside an HTML block.
• Keep normal markdown parsing inside HTML blocks, including emphasis, inline code, components, and real indented code blocks.
• Add regression coverage for nested indented raw HTML, markdown inside HTML, comments, stray close tokens, and code-block boundaries.

Tests

• pnpm --dir packages/comark exec vitest run test/html-block.test.ts
• pnpm --dir packages/comark test
• pnpm exec oxfmt --check packages/comark/test/html-block.test.ts

Not run in this final pass: pnpm run typecheck due existing unrelated errors in packages/comark-vue/test/vite.test.ts.

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commit: 003d556

[atinux]

The more I think, the less I believe we should be able to mix markdown within html @farnabaz, this would probably simplify a lot the logic & performance