Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

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

@@ -6,11 +6,7 @@ import { prisma } from "@/lib/prisma";
 
 export const dynamic = "force-dynamic";
 
-export default async function EditAd({
-  params,
-}: {
-  params: Promise<{ id: string }>;
-}) {
+export default async function EditAd({ params }: { params: Promise<{ id: string }> }) {
   const { id } = await params;
   let ad: Awaited<ReturnType<typeof prisma.websiteAds.findUnique>> = null;
   try {
@@ -28,7 +24,9 @@ export default async function EditAd({
         </div>
         <div>
           <h1 className="m-0 text-xl font-extrabold text-[var(--color-text)]">Edit advertisement</h1>
-          <p className="m-0 text-xs text-[var(--color-text-muted)] mt-0.5"><Link href="/admin/ads">← Advertisements</Link></p>
+          <p className="m-0 text-xs text-[var(--color-text-muted)] mt-0.5">
+            <Link href="/admin/ads">← Advertisements</Link>
+          </p>
         </div>
       </div>
       <form action={updateAd} className="admin-card">

src/app/admin/ads/new/page.tsx

@@ -11,7 +11,9 @@ export default function NewAd() {
         </div>
         <div>
           <h1 className="m-0 text-xl font-extrabold text-[var(--color-text)]">New advertisement</h1>
-          <p className="m-0 text-xs text-[var(--color-text-muted)] mt-0.5"><Link href="/admin/ads">← Advertisements</Link></p>
+          <p className="m-0 text-xs text-[var(--color-text-muted)] mt-0.5">
+            <Link href="/admin/ads">← Advertisements</Link>
+          </p>
         </div>
       </div>
       <form action={createAd} className="admin-card">

src/app/admin/ads/page.tsx

@@ -18,9 +18,7 @@ export default async function AdminAds() {
     ads = [];
   }
 
-  const latest = ads[0]?.createdAt
-    ? ads[0].createdAt.toISOString().slice(0, 10)
-    : "—";
+  const latest = ads[0]?.createdAt ? ads[0].createdAt.toISOString().slice(0, 10) : "—";
 
   return (
     <main>