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/members-content.tsx

@@ -5,6 +5,7 @@ import Link from 'next/link'
 import { useSearchParams, usePathname } from 'next/navigation'
 import { trpc } from '@/lib/trpc/client'
 import { Badge } from '@/components/ui/badge'
+import { CountryDisplay } from '@/components/shared/country-display'
 import { Button } from '@/components/ui/button'
 import { Input } from '@/components/ui/input'
 import { Checkbox } from '@/components/ui/checkbox'
@@ -805,7 +806,7 @@ function ApplicantsTabContent({ search, searchInput, setSearchInput }: { search:
                   )}
                 </TableCell>
                 <TableCell>
-                  <span className="text-sm">{user.nationality || <span className="text-muted-foreground">-</span>}</span>
+                  <span className="text-sm">{user.nationality ? <CountryDisplay country={user.nationality} /> : <span className="text-muted-foreground">-</span>}</span>
                 </TableCell>
                 <TableCell>
                   <span className="text-sm">{user.institution || <span className="text-muted-foreground">-</span>}</span>