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/components/admin/round/ranking-dashboard.tsx

@@ -55,6 +55,7 @@ import {
   Download,
 } from 'lucide-react'
 import type { RankedProjectEntry } from '@/server/services/ai-ranking'
+import { CountryDisplay } from '@/components/shared/country-display'
 
 // ─── Types ────────────────────────────────────────────────────────────────────
 
@@ -163,7 +164,7 @@ function SortableProjectRow({
         {projectInfo?.teamName && (
           <p className="text-xs text-muted-foreground truncate">
             {projectInfo.teamName}
-            {projectInfo.country ? ` · ${projectInfo.country}` : ''}
+            {projectInfo.country ? <> · <CountryDisplay country={projectInfo.country} /></> : ''}
           </p>
         )}
       </div>