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/events/issue.events.ts

@@ -110,6 +110,12 @@ export const issuePageEvents = eventGroup({
       resolved: boolean;
       conclusion: string | null;
     }>(),
+    commentToIssueRequested: type<{
+      commentId: string;
+      title: string;
+      type: string;
+      asSubtask: boolean;
+    }>(),
     voteRequested: type<{ issueId: string; on: boolean }>(),
     /** An image pasted into a text was uploaded (it joins the ticket's files). */
     imagePasted: type<{ issueId: string }>(),

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 });

libs/web/tracker/application/src/lib/stores/issue.store.ts

@@ -608,6 +608,28 @@ export const IssueStore = signalStore(
                 ),
               ),
             ),
+          events.on(issuePageEvents.commentToIssueRequested).pipe(
+            mergeMap(({ payload }) =>
+              comments
+                .turnIntoIssue(
+                  payload.commentId,
+                  payload.title,
+                  payload.type,
+                  payload.asSubtask,
+                )
+                .pipe(
+                  mapResponse({
+                    next: (result) =>
+                      done(
+                        result.key
+                          ? `Creado ${result.key}`
+                          : 'Ticket creado',
+                      ),
+                    error: (error) => failed(describeError(error)),
+                  }),
+                ),
+            ),
+          ),
           events.on(issuePageEvents.reactRequested).pipe(
             mergeMap(({ payload }) =>
               comments.react(payload.commentId, payload.emoji, payload.on).pipe(