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/api/tracker/presenters/src/lib/http/comments.controller.ts

@@ -22,6 +22,7 @@ import {
   ClosePollDto,
   ReactToCommentDto,
   ResolveThreadDto,
+  TurnCommentIntoIssueDto,
   VotePollDto,
 } from './dto/requests.dto';
 import { CommandResultDto } from './dto/responses.dto';
@@ -117,6 +118,28 @@ export class CommentsController {
     return this.comments.closePoll(me.id, commentId, body.decide ?? true);
   }
 
+  @Post(':commentId/issue')
+  @ApiOperation({
+    summary: 'Make a ticket of a comment',
+    description:
+      'Its text becomes the description, as a subtask of its ticket or linked to it (RELATES_TO); the comment shows where it went. Answers the new ticket. Whoever can change tickets.',
+  })
+  @ApiOkResponse({ type: CommandResultDto })
+  @ApiCommandErrors()
+  turnIntoIssue(
+    @CurrentUser() me: User,
+    @Param('commentId') commentId: string,
+    @Body() body: TurnCommentIntoIssueDto,
+  ) {
+    return this.comments.turnIntoIssue(
+      me.id,
+      commentId,
+      body.title,
+      body.type,
+      body.asSubtask ?? false,
+    );
+  }
+
   @Put(':commentId/resolution')
   @ApiOperation({
     summary: 'Settle a conversation (a top-level comment and its replies)',