Competition/Round architecture: full platform rewrite (Phases 1-9)

Replace Pipeline/Stage system with Competition/Round architecture.
New schema: Competition, Round (7 types), JuryGroup, AssignmentPolicy,
ProjectRoundState, DeliberationSession, ResultLock, SubmissionWindow.
New services: round-engine, round-assignment, deliberation, result-lock,
submission-manager, competition-context, ai-prompt-guard.
Full admin/jury/applicant/mentor UI rewrite. AI prompt hardening with
structured prompts, retry logic, and injection detection. All legacy
pipeline/stage code removed. 4 new migrations + seed aligned.

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

src/components/admin/assignment/assignment-preview-sheet.tsx

@@ -0,0 +1,181 @@
+'use client'
+
+import { useState, useEffect } from 'react'
+import { AlertTriangle, Bot, CheckCircle2 } from 'lucide-react'
+import { toast } from 'sonner'
+import { trpc } from '@/lib/trpc/client'
+import {
+  Sheet,
+  SheetContent,
+  SheetDescription,
+  SheetFooter,
+  SheetHeader,
+  SheetTitle,
+} from '@/components/ui/sheet'
+import { Button } from '@/components/ui/button'
+import { ScrollArea } from '@/components/ui/scroll-area'
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
+import { Badge } from '@/components/ui/badge'
+import { Skeleton } from '@/components/ui/skeleton'
+
+interface AssignmentPreviewSheetProps {
+  roundId: string
+  open: boolean
+  onOpenChange: (open: boolean) => void
+}
+
+export function AssignmentPreviewSheet({
+  roundId,
+  open,
+  onOpenChange,
+}: AssignmentPreviewSheetProps) {
+  const utils = trpc.useUtils()
+
+  const {
+    data: preview,
+    isLoading,
+    refetch,
+  } = trpc.roundAssignment.preview.useQuery(
+    { roundId, honorIntents: true, requiredReviews: 3 },
+    { enabled: open }
+  )
+
+  const { mutate: execute, isPending: isExecuting } = trpc.roundAssignment.execute.useMutation({
+    onSuccess: (result) => {
+      toast.success(`Created ${result.created} assignments`)
+      utils.roundAssignment.coverageReport.invalidate({ roundId })
+      utils.roundAssignment.unassignedQueue.invalidate({ roundId })
+      onOpenChange(false)
+    },
+    onError: (err) => {
+      toast.error(err.message)
+    },
+  })
+
+  useEffect(() => {
+    if (open) {
+      refetch()
+    }
+  }, [open, refetch])
+
+  const handleExecute = () => {
+    if (!preview?.assignments || preview.assignments.length === 0) {
+      toast.error('No assignments to execute')
+      return
+    }
+
+    execute({
+      roundId,
+      assignments: preview.assignments.map((a: any) => ({
+        userId: a.userId,
+        projectId: a.projectId,
+      })),
+    })
+  }
+
+  return (
+    <Sheet open={open} onOpenChange={onOpenChange}>
+      <SheetContent className="w-full sm:max-w-xl">
+        <SheetHeader>
+          <SheetTitle>Assignment Preview</SheetTitle>
+          <SheetDescription className="flex items-center gap-2">
+            <Badge variant="outline" className="text-xs gap-1 shrink-0">
+              <Bot className="h-3 w-3" />
+              AI Suggested
+            </Badge>
+            Review the proposed assignments before executing. All assignments are admin-approved on execute.
+          </SheetDescription>
+        </SheetHeader>
+
+        <ScrollArea className="h-[calc(100vh-200px)] mt-6">
+          {isLoading ? (
+            <div className="space-y-3">
+              {[1, 2, 3].map((i) => (
+                <Skeleton key={i} className="h-20 w-full" />
+              ))}
+            </div>
+          ) : preview ? (
+            <div className="space-y-4">
+              <Card>
+                <CardHeader>
+                  <CardTitle className="text-sm flex items-center gap-2">
+                    <CheckCircle2 className="h-4 w-4 text-green-600" />
+                    {preview.stats.assignmentsGenerated || 0} Assignments Proposed
+                </CardTitle>
+                </CardHeader>
+                <CardContent>
+                  <p className="text-sm text-muted-foreground">
+                    {preview.stats.totalJurors || 0} jurors will receive assignments
+                  </p>
+                </CardContent>
+              </Card>
+
+              {preview.warnings && preview.warnings.length > 0 && (
+                <Card className="border-amber-500">
+                  <CardHeader>
+                    <CardTitle className="text-sm flex items-center gap-2">
+                      <AlertTriangle className="h-4 w-4 text-amber-600" />
+                      Warnings ({preview.warnings.length})
+                    </CardTitle>
+                  </CardHeader>
+                  <CardContent>
+                    <ul className="space-y-2 text-sm">
+                      {preview.warnings.map((warning: string, idx: number) => (
+                        <li key={idx} className="flex items-start gap-2">
+                          <span className="text-amber-600">•</span>
+                          <span>{warning}</span>
+                        </li>
+                      ))}
+                    </ul>
+                  </CardContent>
+                </Card>
+              )}
+
+              {preview.assignments && preview.assignments.length > 0 && (
+                <Card>
+                  <CardHeader>
+                    <CardTitle className="text-sm">Assignment Summary</CardTitle>
+                  </CardHeader>
+                  <CardContent>
+                    <div className="space-y-2 text-sm">
+                      <div className="flex justify-between">
+                        <span className="text-muted-foreground">Total assignments:</span>
+                        <span className="font-medium">{preview.assignments.length}</span>
+                      </div>
+                      <div className="flex justify-between">
+                        <span className="text-muted-foreground">Unique projects:</span>
+                        <span className="font-medium">
+                          {new Set(preview.assignments.map((a: any) => a.projectId)).size}
+                        </span>
+                      </div>
+                      <div className="flex justify-between">
+                        <span className="text-muted-foreground">Unique jurors:</span>
+                        <span className="font-medium">
+                          {new Set(preview.assignments.map((a: any) => a.userId)).size}
+                        </span>
+                      </div>
+                    </div>
+                  </CardContent>
+                </Card>
+              )}
+            </div>
+          ) : (
+            <p className="text-sm text-muted-foreground">No preview data available</p>
+          )}
+        </ScrollArea>
+
+        <SheetFooter className="mt-6">
+          <Button variant="outline" onClick={() => onOpenChange(false)}>
+            Cancel
+          </Button>
+          <Button
+            onClick={handleExecute}
+            disabled={isExecuting || !preview?.assignments || preview.assignments.length === 0}
+          >
+            {isExecuting ? 'Executing...' : 'Execute Assignments'}
+          </Button>
+        </SheetFooter>
+      </SheetContent>
+    </Sheet>
+  )
+}