GHSA-mxm6-v9r6-r94c: @nuxtjs/mdc's URL sanitizer misses SVG xlink:href and data:text/html, allowing XSS from untrusted markdown at

## Summary `@nuxtjs/mdc` renders untrusted markdown (including raw HTML) to a Vue component tree. Across two prior advisories it added a URL/attribute sanitizer to block dangerous links in that HTML: `validateProps` / `validateProp` and an `unsafeLinkPrefix` deny-list (`dist/runtime/parser/utils/props.js`). The sanitizer runs at parse time (`dist/runtime/parser/compiler.js`) and `parseMarkdown` enables raw HTML by default (`allowDangerousHtml: true`, `dist/runtime/parser/options.js`), so the sanitizer is the only barrier and it applies with no configuration required. …