fix(markdown): avoid autolinking dotted imports (#2295)

static/js/markdown.js

@@ -524,9 +524,11 @@ export function mdToHtml(src, opts) {
   // allowlist keeps it from matching file names / versions ("package.json",
   // "node.js", "v1.2.3"); the required start/[\s(<] prefix means domains
   // already inside an http link (preceded by "//") or an email ("@") are
-  // skipped. Trailing sentence punctuation is kept outside the link.
+  // skipped. Require the TLD to end at a real domain boundary so dotted code
+  // identifiers like `sklearn.metrics` do not link `sklearn.me` and leave
+  // placeholder fragments in the remaining text.
   s = s.replace(
-    /(^|[\s(<])((?:www\.)?[a-z0-9](?:[a-z0-9-]*[a-z0-9])?(?:\.[a-z0-9-]+)*\.(?:com|org|net|io|ai|co|dev|app|gov|edu|news|info|tech|xyz|me)(?:\/[^\s<>"'`\])]*)?)/gi,
+    /(^|[\s(<])((?:www\.)?[a-z0-9](?:[a-z0-9-]*[a-z0-9])?(?:\.[a-z0-9-]+)*\.(?:com|org|net|io|ai|co|dev|app|gov|edu|news|info|tech|xyz|me)(?=$|[\/\s<>"'`\]).,;:!?])(?:\/[^\s<>"'`\])]*)?)/gi,
     (match, prefix, domain) => {
       const trail = (domain.match(/[.,;:!?)]+$/) || [''])[0];
       const core = trail ? domain.slice(0, -trail.length) : domain;