Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/app/admin/tickets/[id]/page.tsx

@@ -0,0 +1,95 @@
+import { notFound, redirect } from 'next/navigation'
+import { canAccess, getAdminContext, PERMS } from '@/lib/permissions'
+import { prisma } from '@/lib/prisma'
+import { AdminTicketDetail } from './admin-ticket-detail'
+
+export default async function AdminTicketDetailPage({
+  params,
+}: {
+  params: Promise<{ id: string }>
+}) {
+  const { session, permissions } = await getAdminContext()
+  if (!canAccess(permissions, PERMS.TICKETS_VIEW, session.user.rank)) {
+    redirect('/admin')
+  }
+
+  const { id } = await params
+  const ticketId = Number(id)
+  if (Number.isNaN(ticketId)) notFound()
+
+  const ticket = await prisma.websiteTicket.findUnique({
+    where: { id: ticketId },
+    include: {
+      creator: {
+        select: {
+          id: true,
+          username: true,
+          look: true,
+          rank: true,
+          ipRegister: true,
+          mail: true,
+          accountCreated: true,
+        },
+      },
+      assignee: { select: { id: true, username: true } },
+      messages: {
+        orderBy: { createdAt: 'asc' },
+        include: {
+          user: { select: { id: true, username: true, look: true, rank: true } },
+        },
+      },
+    },
+  })
+
+  if (!ticket) notFound()
+
+  // Get staff members for assignment
+  const staffMembers = await prisma.user.findMany({
+    where: { rank: { gte: 4 } },
+    select: { id: true, username: true },
+    orderBy: { username: 'asc' },
+  })
+
+  const canEdit = canAccess(permissions, PERMS.TICKETS_EDIT, session.user.rank)
+
+  return (
+    <AdminTicketDetail
+      ticket={{
+        id: ticket.id,
+        subject: ticket.subject,
+        category: ticket.category,
+        priority: ticket.priority,
+        status: ticket.status,
+        createdAt: ticket.createdAt.toISOString(),
+        closedAt: ticket.closedAt?.toISOString() ?? null,
+        creator: {
+          id: ticket.creator.id,
+          username: ticket.creator.username,
+          look: ticket.creator.look,
+          rank: ticket.creator.rank,
+          mail: ticket.creator.mail,
+          ipRegister: ticket.creator.ipRegister,
+          accountCreated: ticket.creator.accountCreated,
+        },
+        assignee: ticket.assignee
+          ? { id: ticket.assignee.id, username: ticket.assignee.username }
+          : null,
+      }}
+      messages={ticket.messages.map((m) => ({
+        id: m.id,
+        message: m.message,
+        isStaff: m.isStaff === 1,
+        createdAt: m.createdAt.toISOString(),
+        user: {
+          id: m.user.id,
+          username: m.user.username,
+          look: m.user.look,
+          rank: m.user.rank,
+        },
+      }))}
+      staffMembers={staffMembers}
+      currentUserId={session.user.id}
+      canEdit={canEdit}
+    />
+  )
+}