Finish fine-grained ACL across remaining admin pages and actions.

Replace leftover requireStaff gates with module PERMS, drop hardcoded room rank thresholds, and expand contract tests so admin mutations cannot regress to dashboard-only checks.

Co-authored-by: Cursor <[email protected]>

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

@@ -1,8 +1,9 @@
 import { Megaphone } from "lucide-react";
 import Link from "next/link";
-import { notFound } from "next/navigation";
+import { notFound, redirect } from "next/navigation";
 import { deleteAd, updateAd } from "@/actions/admin-ads";
 import { prisma } from "@/lib/prisma";
+import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 
 export const dynamic = "force-dynamic";
 
@@ -11,6 +12,11 @@ export default async function EditAd({
 }: {
 	params: Promise<{ id: string }>;
 }) {
+	const { session, permissions } = await getAdminContext();
+	if (!canAccess(permissions, PERMS.PAGES_VIEW, session.user.rank)) {
+		redirect("/admin");
+	}
+
 	const { id } = await params;
 	let ad: Awaited<ReturnType<typeof prisma.websiteAds.findUnique>> = null;
 	try {