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/semi-finalists-content.tsx

@@ -6,6 +6,7 @@ import type { Route } from 'next'
 import { useRouter } from 'next/navigation'
 import { trpc } from '@/lib/trpc/client'
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
+import { CountryDisplay } from '@/components/shared/country-display'
 import { Input } from '@/components/ui/input'
 import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
@@ -214,7 +215,7 @@ export function SemiFinalistsContent({ editionId }: SemiFinalistsContentProps) {
                           {categoryLabels[project.category ?? ''] ?? project.category}
                         </Badge>
                       </TableCell>
-                      <TableCell className="text-sm">{project.country || '—'}</TableCell>
+                      <TableCell className="text-sm">{project.country ? <CountryDisplay country={project.country} /> : '—'}</TableCell>
                       <TableCell className="text-sm">{project.currentRound}</TableCell>
                       <TableCell>
                         <TooltipProvider>