feat: display primary badge in comments

Extend the primary badge selection feature to comments, so users see
only their selected badge next to their comments (or all badges if
none selected).

Changes:
- Add primaryBadge field to CommentUser interface
- Update comment service mapComment to include primaryBadge
- Update comment-display component to show primary badge logic
- Import and expose PrimaryBadge enum in comment-display component
- Use same conditional logic as profile (show primary or all badges)

api/src/app/services/comment.service.ts

@@ -4,7 +4,7 @@
  * @author Naomi Carrigan
  */
 
-import { Comment, CreateCommentDto } from "@library/shared-types";
+import { Comment, CreateCommentDto, PrimaryBadge } from "@library/shared-types";
 import { prisma } from "../lib/prisma";
 import createDOMPurify from "dompurify";
 import { JSDOM } from "jsdom";
@@ -65,6 +65,7 @@ export class CommentService {
         id: comment.user.id,
         username: comment.user.username,
         avatar: comment.user.avatar || undefined,
+        primaryBadge: (comment.user.primaryBadge as PrimaryBadge) || undefined,
         inDiscord: comment.user.inDiscord,
         isVip: comment.user.isVip,
         isMod: comment.user.isMod,