fix(assignments): make reshuffle concurrency-safe; preserve juryGroupId

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

@@ -2452,7 +2452,7 @@ function JuryProgressTable({ roundId }: { roundId: string }) {
                               disabled={reshuffleMutation.isPending}
                               onClick={() => {
                                 const ok = window.confirm(
-                                  `Reassign all pending/draft projects from ${juror.name} to other jurors within their caps? This cannot be undone.`
+                                  `Reassign all unsubmitted projects from ${juror.name} to other jurors within their caps? Submitted and locked evaluations will be preserved. This cannot be undone.`
                                 )
                                 if (!ok) return
                                 reshuffleMutation.mutate({ roundId, jurorId: juror.id })