Revert "Add missing admin action files and navigation links"

This reverts commit 41be6835bf.

src/app/admin/users/[id]/loading.tsx

@@ -1,50 +0,0 @@
-import { Skeleton } from '@/components/ui/skeleton'
-
-export default function UserDetailLoading() {
-  return (
-    <div className="space-y-6">
-      {/* Breadcrumb */}
-      <div className="flex items-center gap-2">
-        <Skeleton className="h-4 w-16" />
-        <Skeleton className="h-4 w-4" />
-        <Skeleton className="h-4 w-24" />
-      </div>
-
-      {/* User header */}
-      <div className="flex items-center gap-4">
-        <Skeleton className="h-16 w-16 rounded" />
-        <div>
-          <Skeleton className="h-9 w-40" />
-          <div className="flex items-center gap-2 mt-1">
-            <Skeleton className="h-5 w-16 rounded-full" />
-            <Skeleton className="h-5 w-16 rounded-full" />
-          </div>
-        </div>
-      </div>
-
-      <div className="grid gap-6 lg:grid-cols-2">
-        {/* Form */}
-        <div className="rounded-lg border bg-card p-6 space-y-4">
-          <Skeleton className="h-6 w-24" />
-          {Array.from({ length: 6 }).map((_, i) => (
-            <div key={i} className="space-y-2">
-              <Skeleton className="h-4 w-20" />
-              <Skeleton className="h-10 w-full" />
-            </div>
-          ))}
-          <Skeleton className="h-10 w-24 mt-4" />
-        </div>
-
-        {/* Side cards */}
-        <div className="space-y-6">
-          {Array.from({ length: 3 }).map((_, i) => (
-            <div key={i} className="rounded-lg border bg-card p-6 space-y-3">
-              <Skeleton className="h-6 w-32" />
-              <Skeleton className="h-20 w-full" />
-            </div>
-          ))}
-        </div>
-      </div>
-    </div>
-  )
-}