feat(final-docs): optional-mode banner/panel + admin 'Documents shown to judges' picker

- finalist banner/panel render an optional-uploads state (settle to green via
  hasRequired ? allRequiredUploaded : allUploaded; 'optional' copy when nothing required)
- ReviewDocsPicker admin card on the LIVE_FINAL round page to curate judge-visible docs

src/app/(admin)/admin/rounds/[roundId]/page.tsx

@@ -98,6 +98,7 @@ import { WaitlistCard } from '@/components/admin/grand-finale/waitlist-card'
 import { FinalistEnrollmentCard } from '@/components/admin/grand-finale/finalist-enrollment-card'
 import { FinalDocsReminderButton } from '@/components/admin/grand-finale/final-docs-reminder-button'
 import { FinalDocsUploadsToggle } from '@/components/admin/grand-finale/final-docs-uploads-toggle'
+import { ReviewDocsPicker } from '@/components/admin/grand-finale/review-docs-picker'
 import { RankingDashboard } from '@/components/admin/round/ranking-dashboard'
 import { CoverageReport } from '@/components/admin/assignment/coverage-report'
 import { AssignmentPreviewSheet } from '@/components/admin/assignment/assignment-preview-sheet'
@@ -1543,6 +1544,7 @@ export default function RoundDetailPage() {
                   <FinalDocsReminderButton programId={programId} />
                 </div>
               </div>
+              <ReviewDocsPicker programId={programId} roundId={roundId} />
               <div className="grid gap-4 md:grid-cols-2">
                 <FinalistSlotsCard programId={programId} />
                 <WaitlistCard programId={programId} />