Sideload email-addresses in syncCurrentUser

The other_emails field reads currentUser.emailAddresses, an async:false
relationship that stays empty unless sideloaded. Include it in the auth
sync alongside course-participations so the Lobbyside column populates.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: TropicolX

app/services/authenticator.ts

@@ -118,6 +118,8 @@ export default class AuthenticatorService extends Service {
       'affiliate-links.user',
       // Powers the `stages_completed` field the Lobbyside widget pushes via setVisitor.
       'course-participations',
+      // Powers the `other_emails` field the Lobbyside widget pushes via setVisitor.
+      'email-addresses',
       'feature-suggestions',
       'promotional-discounts',
       'promotional-discounts.affiliate-referral',