feat(site): consistent card radius and remove duplicate login CTAs

Professional tidy-up of the landing experience:
- SurfaceCard: unified rounded-xl radius for a crisper, consistent look.
- Hero: matches the new card radius and gains a dual-direction title
  shadow so the headline stays readable over the header artwork.
- Login/register: drop the duplicated "no account / have an account"
  paragraphs — the forms already ship an inline footer, so one clear CTA
  cluster remains and the side column is cleaner.

src/app/(site)/register/page.tsx

@@ -4,7 +4,6 @@ import Image from "next/image";
 import { getTranslations } from "next-intl/server";
 import { AuthTopBar } from "@/components/auth/auth-top-bar";
 import { RegisterForm } from "@/components/auth/register-form";
-import Link from "@/components/link";
 import { Reveal } from "@/components/motion-reveal";
 import { UserAvatarThumbnail } from "@/components/shared/user-avatar-thumbnail";
 import { SurfaceCard } from "@/components/surface-card";
@@ -197,22 +196,6 @@ export default async function RegisterPage() {
 								</div>
 							</SurfaceCard>
 						)}
-
-						<p
-							className="text-sm text-center"
-							style={{ color: "var(--color-text-muted)" }}
-						>
-							{tpr("alreadyHaveAccountPre")}{" "}
-							<Link
-								href="/login"
-								className="font-extrabold hover:underline"
-								style={{
-									color: "var(--color-primary-readable, var(--color-primary))",
-								}}
-							>
-								{tpr("alreadyHaveAccountLink")}
-							</Link>
-						</p>
 					</div>
 
 					{/* Right: form */}
@@ -220,7 +203,7 @@ export default async function RegisterPage() {
 						<SurfaceCard
 							title={tpr("title")}
 							icon="/assets/images/icons/navigation/me.png"
-							bodyClassName="p-6"
+							bodyClassName="p-6 sm:p-7"
 						>
 							<p
 								className="text-sm mb-6"