feat: render visa status + next date on AttendingMembersCard

Each member now sees their own visa status (status badge + next
upcoming date) on the applicant dashboard, sourced from
applicant.getMyVisaApplications. Other teammates' rows still show the
generic "Visa support" badge if they need a visa, since the platform
deliberately scopes visa visibility to the caller. The whole visa
surface auto-hides if the program toggle is off.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/server/routers/applicant.ts

@@ -2814,6 +2814,7 @@ export const applicantRouter = router({
       .map((a) => ({
         id: a.visaApplication!.id,
         attendingMemberId: a.id,
+        userId: a.userId,
         status: a.visaApplication!.status,
         nationality: a.visaApplication!.nationality,
         invitationSentAt: a.visaApplication!.invitationSentAt,