Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/app/admin/translations/translations-tabs.tsx

@@ -0,0 +1,40 @@
+'use client'
+
+import { Gamepad2, Globe, Server } from 'lucide-react'
+import Link from 'next/link'
+import { usePathname } from 'next/navigation'
+import { cn } from '@/lib/utils'
+
+const TABS = [
+  { href: '/admin/translations/cms', label: 'CMS', icon: Globe },
+  { href: '/admin/translations/client', label: 'Client (Nitro)', icon: Gamepad2 },
+  { href: '/admin/translations/emulator', label: 'Emulator', icon: Server },
+] as const
+
+export function TranslationsTabs() {
+  const pathname = usePathname()
+
+  return (
+    <div className="flex gap-1 border-b">
+      {TABS.map((t) => {
+        const active = pathname === t.href || pathname.startsWith(`${t.href}/`)
+        const Icon = t.icon
+        return (
+          <Link
+            key={t.href}
+            href={t.href}
+            className={cn(
+              '-mb-px flex items-center gap-2 border-b-2 px-4 py-2 text-sm font-medium transition-colors',
+              active
+                ? 'border-primary text-foreground'
+                : 'border-transparent text-muted-foreground hover:text-foreground',
+            )}
+          >
+            <Icon className="h-4 w-4" />
+            {t.label}
+          </Link>
+        )
+      })}
+    </div>
+  )
+}