feat(admin): extend wysiwyg live editor

- Add is_required and allow_multiselect category toggles

- Implement module-popover for product module assignment

- Add cascade-protected deletion for categories and products

- Add sidebar link with AdminNavLink active states

shop/components/admin/admin-nav-link.tsx

@@ -0,0 +1,28 @@
+'use client'
+
+import Link from 'next/link'
+import { usePathname } from 'next/navigation'
+import { ReactNode } from 'react'
+
+interface AdminNavLinkProps {
+  href: string
+  children: ReactNode
+}
+
+export function AdminNavLink({ href, children }: AdminNavLinkProps) {
+  const pathname = usePathname()
+  const isActive = pathname === href
+
+  return (
+    <Link
+      href={href}
+      className={`flex items-center gap-3 px-3 py-2 rounded-lg transition-all ${
+        isActive
+          ? 'bg-primary text-black font-semibold'
+          : 'text-slate-600 dark:text-slate-400 hover:text-slate-900 dark:hover:text-white hover:bg-slate-100 dark:hover:bg-white/5'
+      }`}
+    >
+      {children}
+    </Link>
+  )
+}