fix(users): pass last_active_at through to the Users list

The page maps each row field by field and left the new field out, so
everyone showed "Never" although the stamps were being written.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/dashboard/settings/users/page.tsx

@@ -31,6 +31,7 @@ export default async function UsersPage() {
       sites: Array.isArray(row.sites) ? row.sites.filter((id): id is string => typeof id === "string") : [],
       is_active: row.is_active === true,
       must_change_password: row.must_change_password === true,
+      last_active_at: String(row.last_active_at ?? ""),
       float_card: row.float_card === true,
       float_card_number: String(row.float_card_number ?? ""),
       float_card_last_digits: String(row.float_card_last_digits ?? ""),