feat(docs)!: require Astro 7 and run the plugins on a unified processor

[tmccoy14]

Moves @eqtylab/docs to Astro 7 and releases it as 0.11.0. guardian's docs site needs it: Astro 6 carries a Critical advisory (GHSA-26w7-cxv4-gfx2, remote code execution through AVIF optimization) that is fixed only in astro 7.2.8, and guardian's security scans fail on it.

Breaking

• Peers are now astro ^7.2.10, @astrojs/mdx ^8 and @astrojs/react ^7. @astrojs/mdx 8 needs astro 7.2.10, and supporting Astro 6 as well would mean two markdown code paths
• Sites on Astro 6 stay on 0.10.x

Why the integration changes

Astro 7's default Markdown processor, Sätteri, runs no remark or rehype plugins and only logs a warning. Left as it was, the integration's plugins would stop running: links would lose base, and prose would lose its styling.

The integration now adds its plugins to a unified processor from @astrojs/markdown-remark:

• A site that already has one (including one Astro builds from the deprecated markdown.remarkPlugins) is extended, not replaced, so the site's own plugins keep running. guardian's site relies on this for its remarkStripLeadingH1
• Otherwise a new one is created

@astrojs/mdx 8 reuses markdown.processor through extendMarkdownConfig, so .mdx pages get the same plugins. gfm and smartypants move onto the processor, since the top-level settings are deprecated.

Verification

• pnpm lint, pnpm format:check, pnpm build and pnpm test pass
• Demo site, built on main (Astro 6) and on this branch: all 2,390 pages differ only in entity encoding, whitespace between tags and minified CSS. The visible content and the plugins' output are unchanged
• guardian's docs site, built against this package with Astro 7, MDX 8, React 7 and Equality 4.11:
  • same 440 pages, tables, code blocks and links
  • its own remark plugin still runs
  • its CI checks pass, including the base-path snapshot build

Worth knowing

• Vite 8's CSS minifier drops -webkit-backdrop-filter, so dialog backdrops lose their blur in Safari before 18

After merge

Publish with pnpm release from packages/docs. Only @eqtylab/ui publishes automatically.

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