feat: admin can confirm/decline attendance on team behalf

This edition is being handled manually via email — admins need to
record what each finalist replied. Adds:
  - finalist.adminConfirm — flips PENDING → CONFIRMED with attendees +
    visa flags. Same cap and team-membership checks as the public flow,
    audit-logged as FINALIST_ADMIN_CONFIRM.
  - finalist.adminDecline — flips PENDING → DECLINED with optional
    reason and triggers waitlist promotion. Audit-logged as
    FINALIST_ADMIN_DECLINE.
  - finalist.getConfirmationDetail — feeds the admin attendee picker.
  - Per-row Confirm / Decline actions on the Logistics > Confirmations
    table (PENDING rows only) backed by a shared dialog that switches
    between attendee-picker and reason-input modes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/admin/logistics/confirmations-tab.tsx

@@ -13,8 +13,10 @@ import {
   TableHeader,
   TableRow,
 } from '@/components/ui/table'
+import { Button } from '@/components/ui/button'
 import { formatEnumLabel } from '@/lib/utils'
 import type { FinalistConfirmationStatus } from '@prisma/client'
+import { AdminAttendanceDialog, type AttendanceMode } from './admin-attendance-dialog'
 
 interface Props {
   programId: string
@@ -51,6 +53,11 @@ function relativeFromNow(d: Date): string {
 
 export function ConfirmationsTab({ programId }: Props) {
   const [statusFilter, setStatusFilter] = useState<StatusFilter>('all')
+  const [dialogState, setDialogState] = useState<{
+    open: boolean
+    mode: AttendanceMode
+    confirmationId: string | null
+  }>({ open: false, mode: 'confirm', confirmationId: null })
   const { data, isLoading } = trpc.logistics.listConfirmations.useQuery(
     { programId },
     { refetchInterval: 60_000 },
@@ -130,11 +137,13 @@ export function ConfirmationsTab({ programId }: Props) {
                     <TableHead>Deadline</TableHead>
                     <TableHead className="text-right">Attendees</TableHead>
                     <TableHead>Notes</TableHead>
+                    <TableHead className="text-right">Actions</TableHead>
                   </TableRow>
                 </TableHeader>
                 <TableBody>
                   {filtered.map((r) => {
                     const badge = STATUS_BADGE[r.status]
+                    const isPending = r.status === 'PENDING'
                     return (
                       <TableRow key={r.id}>
                         <TableCell>
@@ -179,6 +188,40 @@ export function ConfirmationsTab({ programId }: Props) {
                                 ? `Expired ${formatDeadline(new Date(r.expiredAt))}`
                                 : '—'}
                         </TableCell>
+                        <TableCell className="text-right">
+                          {isPending ? (
+                            <div className="flex justify-end gap-2">
+                              <Button
+                                size="sm"
+                                variant="default"
+                                onClick={() =>
+                                  setDialogState({
+                                    open: true,
+                                    mode: 'confirm',
+                                    confirmationId: r.id,
+                                  })
+                                }
+                              >
+                                Confirm
+                              </Button>
+                              <Button
+                                size="sm"
+                                variant="outline"
+                                onClick={() =>
+                                  setDialogState({
+                                    open: true,
+                                    mode: 'decline',
+                                    confirmationId: r.id,
+                                  })
+                                }
+                              >
+                                Decline
+                              </Button>
+                            </div>
+                          ) : (
+                            <span className="text-muted-foreground text-xs">—</span>
+                          )}
+                        </TableCell>
                       </TableRow>
                     )
                   })}
@@ -188,6 +231,16 @@ export function ConfirmationsTab({ programId }: Props) {
           )}
         </CardContent>
       </Card>
+
+      <AdminAttendanceDialog
+        open={dialogState.open}
+        mode={dialogState.mode}
+        confirmationId={dialogState.confirmationId}
+        programId={programId}
+        onOpenChange={(next) =>
+          setDialogState((prev) => ({ ...prev, open: next }))
+        }
+      />
     </div>
   )
 }