feat: quick polls in comments that end in a decision

«📊 Añadir una encuesta» adds 2 to 6 options to a new comment. Members,
viewers too, vote by clicking an option (one vote each, which they can
change or take back) and see each option's votes as a bar. Whoever
started it, or an admin, closes it with «Cerrar y decidir»: the most
voted wins (none on a tie) and a «Decidido: …» reply marked as a
decision shows above the ticket. Events of the comment (voted, closed).

API: addComment(…, poll), votePoll, closePoll, Comment.poll;
POST /api/comments/{id}/poll/vote and …/poll/close. MCP: add_comment
poll, vote_poll, close_poll.

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

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

@@ -101,12 +101,29 @@ export class IssueFacade {
     body: string,
     files: File[] = [],
     replyTo: string | null = null,
+    poll: string[] | null = null,
   ): void {
     this.withIssue((issueId) =>
-      this.dispatch.commentAddRequested({ issueId, body, files, replyTo }),
+      this.dispatch.commentAddRequested({
+        issueId,
+        body,
+        files,
+        replyTo,
+        poll,
+      }),
     );
   }
 
+  /** Votes in a comment's poll (null takes the vote back). */
+  votePoll(commentId: string, option: number | null): void {
+    this.dispatch.pollVoteRequested({ commentId, option });
+  }
+
+  /** Closes a poll; with `decide`, its winner stays as a decision. */
+  closePoll(commentId: string, decide = true): void {
+    this.dispatch.pollCloseRequested({ commentId, decide });
+  }
+
   /** To the trash (true) or back from it (false). */
   setTrashed(trashed: boolean): void {
     this.withIssue((issueId) =>