feat: what is new since my last visit, and turning a comment into a ticket

Opening a ticket notes the visit and answers the one before (issue_visits),
so the page marks others' comments and changes since. A comment can become
a ticket of its own, as a subtask or linked; it remembers where it went.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/web/tracker/application/src/lib/facades/issue.facade.ts

@@ -316,6 +316,21 @@ export class IssueFacade {
     });
   }
 
+  /** Makes a ticket of a comment: a subtask of this one, or linked to it. */
+  turnCommentIntoIssue(
+    commentId: string,
+    title: string,
+    type: string,
+    asSubtask: boolean,
+  ): void {
+    this.dispatch.commentToIssueRequested({
+      commentId,
+      title: title.trim(),
+      type,
+      asSubtask,
+    });
+  }
+
   /** Marks a comment as a decision of the ticket (`on`) or unmarks it. */
   markDecision(commentId: string, on: boolean): void {
     this.dispatch.decisionRequested({ commentId, on });