fix(linkify): strip trailing punctuation from auto-linked URLs

URLs at the end of a sentence followed by . , ; : ) etc. were capturing
the punctuation character as part of the URL, producing broken links
(e.g. https://example.com. instead of https://example.com).

Fix in both places where URL linkification happens:
- lib/jf2-to-as2.js linkifyUrls() — used when federating posts via AP
- lib/mastodon/routes/statuses.js processStatusContent() — used when
  creating posts via the Mastodon Client API

Both now use a replacement callback that strips trailing [.,;:!?)\]'"]
from the captured URL before inserting it into the <a> tag.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/jf2-to-as2.js

@@ -32,7 +32,12 @@ function linkifyUrls(html) {
   if (!html) return html;
   return html.replace(
     /(?<![=">])(https?:\/\/[^\s<"]+)/g,
-    '<a href="$1">$1</a>',
+    (_, url) => {
+      // Strip trailing punctuation that is almost never part of a URL
+      // e.g. "See https://example.com." → link to https://example.com
+      const clean = url.replace(/[.,;:!?)\]'"]+$/, "");
+      return `<a href="${clean}">${clean}</a>`;
+    },
   );
 }
 

lib/mastodon/routes/statuses.js

@@ -1066,7 +1066,11 @@ function processStatusContent(content, rawText) {
     // Linkify bare URLs (http/https)
     html = html.replace(
       /(https?:\/\/[^\s<>"')\]]+)/g,
-      '<a href="$1" rel="nofollow noopener noreferrer" target="_blank">$1</a>',
+      (_, url) => {
+        // Strip trailing punctuation that is almost never part of a URL
+        const clean = url.replace(/[.,;:!?]+$/, "");
+        return `<a href="${clean}" rel="nofollow noopener noreferrer" target="_blank">${clean}</a>`;
+      },
     );
 
     // Convert @user@domain mentions to profile links