Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/app/admin/users/[id]/edit/page.tsx

@@ -12,11 +12,7 @@ export const dynamic = "force-dynamic";
 const DUCKETS_TYPE = 0;
 const DIAMONDS_TYPE = 5;
 
-export default async function AdminUserEdit({
-  params,
-}: {
-  params: Promise<{ id: string }>;
-}) {
+export default async function AdminUserEdit({ params }: { params: Promise<{ id: string }> }) {
   // Gate the page with the SAME helper the action re-checks.
   await requireStaff();
 
@@ -88,7 +84,9 @@ export default async function AdminUserEdit({
           <User size={20} className="text-[var(--color-primary)]" />
         </div>
         <div>
-          <h1 className="m-0 text-xl font-extrabold text-[var(--color-text)]">{t("title", { username: user.username })}</h1>
+          <h1 className="m-0 text-xl font-extrabold text-[var(--color-text)]">
+            {t("title", { username: user.username })}
+          </h1>
           <p className="m-0 text-xs text-[var(--color-text-muted)] mt-0.5">{t("idLabel", { id: user.id })}</p>
         </div>
       </div>
@@ -146,8 +144,12 @@ export default async function AdminUserEdit({
         <p className="text-xs text-gray-500 dark:text-gray-400">{t("hint")}</p>
 
         <div className="flex gap-2 mt-2">
-          <button type="submit" className="btn btn-primary">{t("save")}</button>
-          <Link href={`/admin/users/${user.id}`} className="btn">{t("cancel")}</Link>
+          <button type="submit" className="btn btn-primary">
+            {t("save")}
+          </button>
+          <Link href={`/admin/users/${user.id}`} className="btn">
+            {t("cancel")}
+          </Link>
         </div>
       </form>
     </main>