Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/app/admin/subscriptions/page.tsx

@@ -69,7 +69,9 @@ export default async function AdminSubscriptions() {
       </div>
 
       <section className="mt-6">
-        <h2 className="admin-section-title">{t("activeSubscriptions")} ({active.length})</h2>
+        <h2 className="admin-section-title">
+          {t("activeSubscriptions")} ({active.length})
+        </h2>
         <div className="admin-card">
           <table>
             <thead>
@@ -90,11 +92,15 @@ export default async function AdminSubscriptions() {
                     <td>{s.userId ?? "—"}</td>
                     <td>{s.subscriptionType ?? "—"}</td>
                     <td>
-                      <span className={`inline-block text-[0.72rem] font-bold px-2 py-0.5 rounded-full ${soon ? "bg-[var(--color-primary)]/18 text-[var(--color-text)]" : "bg-green-600/20 text-[var(--color-text)]"}`}>
+                      <span
+                        className={`inline-block text-[0.72rem] font-bold px-2 py-0.5 rounded-full ${soon ? "bg-[var(--color-primary)]/18 text-[var(--color-text)]" : "bg-green-600/20 text-[var(--color-text)]"}`}
+                      >
                         {soon ? t("statusExpiring") : t("statusActive")}
                       </span>
                     </td>
-                    <td className="text-sm text-gray-500 dark:text-gray-400 whitespace-nowrap">{fmt(s.expiresAt)}</td>
+                    <td className="text-sm text-gray-500 dark:text-gray-400 whitespace-nowrap">
+                      {fmt(s.expiresAt)}
+                    </td>
                   </tr>
                 );
               })}