Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/app/admin/rooms/edit/[id]/page.tsx

@@ -0,0 +1,69 @@
+import { DoorOpen, Eye } from 'lucide-react'
+import Link from 'next/link'
+import { redirect } from 'next/navigation'
+import { AdminBreadcrumb } from '@/components/admin/admin-breadcrumb'
+import { Badge } from '@/components/ui/badge'
+import { Button } from '@/components/ui/button'
+import { canAccess, getAdminContext, PERMS } from '@/lib/permissions'
+import { loadRoom } from '../../_lib/load-room'
+import { RoomEditForm } from '../../[id]/room-edit-form'
+
+export default async function RoomEditPage({
+  params,
+}: {
+  params: Promise<{ locale: string; id: string }>
+}) {
+  const { id } = await params
+  const { session, permissions } = await getAdminContext()
+  if (!canAccess(permissions, PERMS.ROOMS_VIEW, session.user.rank) || session.user.rank < 4) {
+    redirect('/admin')
+  }
+
+  const room = await loadRoom(id)
+
+  return (
+    <div className="space-y-6">
+      <AdminBreadcrumb
+        items={[
+          { label: 'Rooms', href: '/admin/rooms' },
+          { label: room.name, href: `/admin/rooms/show/${room.id}` },
+          { label: 'Edit' },
+        ]}
+      />
+
+      <div className="flex items-center justify-between">
+        <div className="flex items-center gap-3">
+          <DoorOpen className="h-6 w-6 text-muted-foreground" />
+          <div>
+            <h1 className="text-2xl font-bold flex items-center gap-2">
+              Edit: {room.name}
+              <Badge variant="secondary" className="text-xs">
+                #{room.id}
+              </Badge>
+            </h1>
+            <p className="text-sm text-muted-foreground">
+              Owner: {room.owner.username} &middot; {room.users}/{room.usersMax} users
+            </p>
+          </div>
+        </div>
+        <Button variant="outline" asChild>
+          <Link href={`/admin/rooms/show/${room.id}`}>
+            <Eye className="mr-2 h-4 w-4" /> View
+          </Link>
+        </Button>
+      </div>
+
+      <RoomEditForm
+        room={{
+          id: room.id,
+          name: room.name,
+          description: room.description,
+          state: room.state,
+          usersMax: room.usersMax,
+          users: room.users,
+          ownerName: room.owner.username,
+        }}
+      />
+    </div>
+  )
+}