[Draft] feat(component-library): add MtMarkdown

[Arnold Stoba (arnoldstoba)]

What?

Adds the experimental MtMarkdown, which renders Markdown such as an AI answer, also while it is still streaming. It is a configured wrapper around Comark's <Markdown> with Meteor's typography.

• Supports GitHub Flavored Markdown: tables, task lists, strikethrough and bare links.
• Raw HTML shows as text, links only use http, https, mailto and tel, and images with a full address only load from allowedImagePrefixes.
• Code blocks have a copy button.

Why?

AI answers arrive as Markdown, token by token:

<mt-markdown :content="answer" :streaming="status === 'streaming'" />

An answer such as Two products are **low on stock**: would show raw ** while it streams. Converting it to HTML for v-html would run untrusted model output as HTML, and a model's answer can be influenced by the data it reads.

How?

• Comark (NuxtLabs) parses and renders the Markdown. Nuxt UI uses it for AI chat, and Vercel's streamdown team recommends it for Vue. While streaming, it completes unfinished syntax at the end, such as **bold.
• The configuration:
  • turns off raw HTML, Comark's component syntax and heading ids;
  • limits link schemes and image addresses with Comark's security plugin;
  • replaces pre with Meteor's code block, which adds the copy button;
  • wraps tables, so wide tables scroll;
  • opens external links in a new tab;
  • maps every element itself and replaces any Comark setup of the app, so global components such as Nuxt UI's ProseP don't change the content.
• Comark is contained to MtMarkdown: its code is in a chunk that only MtMarkdown and the root index.js import, and importing other components leaves it out. A new size-limit entry tracks MtMarkdown on its own.
• New dependency: @comark/vue (MIT). The full bundle budget grows by about 54 kB.

Testing?

Specs for our configuration (tables, task lists, raw HTML, unsafe links, images, copying, streaming) and SSR with hydration. Unit tests, types, build, size-limit, the docs build and the Nuxt example build pass.

Anything Else?

• Comark is still pre-1.0 (0.7).
• Its security plugin logs a console warning for every address it removes, including a link whose address is still streaming.
• feat(component-library): add the AI chat components #1399 builds on this: mt-reasoning renders its text with MtMarkdown, and mt-tool reuses the code block. Its mt-tool needs to pass code to the code block as slot content after rebasing.

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