Restore task link markdown handler

desktop/src/shared/ui/markdown.tsx

@@ -2102,6 +2102,14 @@ function MarkdownInner({
     },
     [goChannel],
   );
+  const onOpenAgentConversationLink = React.useCallback(
+    (link: ParsedAgentConversationLink) => {
+      void goChannel(link.channelId, {
+        taskReplyId: link.agentReplyId,
+      });
+    },
+    [goChannel],
+  );
   const onOpenMessageLink = React.useCallback(
     (link: ParsedMessageLink) => {
       // Always route through `goChannel` with `messageId` set: the channel