feat: multi-role jury fix, country flags, applicant deadline banner, timeline

- Fix project list returning empty for users with both SUPER_ADMIN and
  JURY_MEMBER roles (jury filter now skips admins) in project, assignment,
  and evaluation routers
- Add CountryDisplay component showing flag emoji + name everywhere
  country is displayed (admin, observer, jury, mentor views — 17 files)
- Add countdown deadline banner on applicant dashboard for INTAKE,
  SUBMISSION, and MENTORING rounds with live timer
- Remove quick action buttons from applicant dashboard
- Fix competition timeline sidebar: green dots/connectors only up to
  current round, yellow dot for current round, red connector into
  rejected round, grey after

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/server/routers/assignment.ts

@@ -907,6 +907,7 @@ export const assignmentRouter = router({
       // Verify access
       if (
         userHasRole(ctx.user, 'JURY_MEMBER') &&
+        !userHasRole(ctx.user, 'SUPER_ADMIN', 'PROGRAM_ADMIN') &&
         assignment.userId !== ctx.user.id
       ) {
         throw new TRPCError({