Admin dashboard & round management UX overhaul

- Extract round detail monolith (2900→600 lines) into 13 standalone components
- Add shared round/status config (round-config.ts) replacing 4 local copies
- Delete 12 legacy competition-scoped pages, merge project pool into projects page
- Add round-type-specific dashboard stat panels (submission, mentoring, live final, deliberation, summary)
- Add contextual header quick actions based on active round type
- Improve pipeline visualization: progress bars, checkmarks, chevron connectors, overflow fix
- Add config tab completion dots (green/amber/red) and inline validation warnings
- Enhance juries page with round assignments, member avatars, and cap mode badges
- Add context-aware project list (recent submissions vs active evaluations)
- Move competition settings into Manage Editions page

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

src/components/admin/assignment/reassignment-history.tsx

@@ -0,0 +1,111 @@
+'use client'
+
+import { useState } from 'react'
+import { trpc } from '@/lib/trpc/client'
+import { cn } from '@/lib/utils'
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
+import { Skeleton } from '@/components/ui/skeleton'
+import { Badge } from '@/components/ui/badge'
+import { History, ChevronRight } from 'lucide-react'
+
+export type ReassignmentHistoryProps = {
+  roundId: string
+}
+
+export function ReassignmentHistory({ roundId }: ReassignmentHistoryProps) {
+  const [expanded, setExpanded] = useState(false)
+  const { data: events, isLoading } = trpc.assignment.getReassignmentHistory.useQuery(
+    { roundId },
+    { enabled: expanded },
+  )
+
+  return (
+    <Card>
+      <CardHeader
+        className="cursor-pointer select-none"
+        onClick={() => setExpanded(!expanded)}
+      >
+        <CardTitle className="text-base flex items-center gap-2">
+          <History className="h-4 w-4" />
+          Reassignment History
+          <ChevronRight className={cn('h-4 w-4 ml-auto transition-transform', expanded && 'rotate-90')} />
+        </CardTitle>
+        <CardDescription>Juror dropout, COI, transfer, and cap redistribution audit trail</CardDescription>
+      </CardHeader>
+      {expanded && (
+        <CardContent>
+          {isLoading ? (
+            <div className="space-y-3">
+              {[1, 2].map((i) => <Skeleton key={i} className="h-16 w-full" />)}
+            </div>
+          ) : !events || events.length === 0 ? (
+            <p className="text-sm text-muted-foreground text-center py-6">
+              No reassignment events for this round
+            </p>
+          ) : (
+            <div className="space-y-4 max-h-[500px] overflow-y-auto">
+              {events.map((event) => (
+                <div key={event.id} className="border rounded-lg p-3 space-y-2">
+                  <div className="flex items-center justify-between">
+                    <div className="flex items-center gap-2">
+                      <Badge variant={event.type === 'DROPOUT' ? 'destructive' : 'secondary'}>
+                        {event.type === 'DROPOUT' ? 'Juror Dropout' : event.type === 'COI' ? 'COI Reassignment' : event.type === 'TRANSFER' ? 'Assignment Transfer' : 'Cap Redistribution'}
+                      </Badge>
+                      <span className="text-sm font-medium">
+                        {event.droppedJuror.name}
+                      </span>
+                    </div>
+                    <span className="text-xs text-muted-foreground">
+                      {new Date(event.timestamp).toLocaleString()}
+                    </span>
+                  </div>
+
+                  <p className="text-xs text-muted-foreground">
+                    By {event.performedBy.name || event.performedBy.email} — {event.movedCount} project(s) reassigned
+                    {event.failedCount > 0 && `, ${event.failedCount} failed`}
+                  </p>
+
+                  {event.moves.length > 0 && (
+                    <div className="mt-2">
+                      <table className="w-full text-xs">
+                        <thead>
+                          <tr className="text-muted-foreground border-b">
+                            <th className="text-left py-1 font-medium">Project</th>
+                            <th className="text-left py-1 font-medium">Reassigned To</th>
+                          </tr>
+                        </thead>
+                        <tbody>
+                          {event.moves.map((move, i) => (
+                            <tr key={i} className="border-b last:border-0">
+                              <td className="py-1.5 pr-2 max-w-[250px] truncate">
+                                {move.projectTitle}
+                              </td>
+                              <td className="py-1.5 font-medium">
+                                {move.newJurorName}
+                              </td>
+                            </tr>
+                          ))}
+                        </tbody>
+                      </table>
+                    </div>
+                  )}
+
+                  {event.failedProjects.length > 0 && (
+                    <div className="mt-1">
+                      <p className="text-xs font-medium text-destructive">Could not reassign:</p>
+                      <ul className="text-xs text-muted-foreground list-disc list-inside">
+                        {event.failedProjects.map((p, i) => (
+                          <li key={i}>{p}</li>
+                        ))}
+                      </ul>
+                    </div>
+                  )}
+                </div>
+              ))}
+            </div>
+          )}
+        </CardContent>
+      )}
+    </Card>
+  )
+}