Add initial Portal version

src/app/[locale]/login/page.tsx

@@ -0,0 +1,60 @@
+"use client";
+
+import { signIn } from "next-auth/react";
+import { useTranslations } from "next-intl";
+
+export default function LoginPage() {
+  const t = useTranslations("login");
+
+  return (
+    <div className="fixed inset-0 flex items-center justify-center bg-surface-0">
+      {/* Background grid pattern */}
+      <div
+        className="absolute inset-0 opacity-[0.04]"
+        style={{
+          backgroundImage: `
+            linear-gradient(var(--color-accent) 1px, transparent 1px),
+            linear-gradient(90deg, var(--color-accent) 1px, transparent 1px)
+          `,
+          backgroundSize: "60px 60px",
+        }}
+      />
+
+      <div className="relative z-10 w-full max-w-sm px-5 animate-in">
+        {/* Logo mark */}
+        <div className="flex justify-center mb-8">
+          <div className="relative h-12 w-12">
+            <div className="absolute inset-0 rounded-lg bg-accent/15" />
+            <div className="absolute inset-[5px] rounded-md bg-accent" />
+          </div>
+        </div>
+
+        <div className="bg-surface-1 rounded-2xl border border-border p-8 shadow-2xl shadow-black/40">
+          <h1 className="font-display text-xl font-semibold text-center mb-1">
+            {t("title")}
+          </h1>
+          <p className="text-text-secondary text-sm text-center mb-8">
+            {t("subtitle")}
+          </p>
+
+          <button
+            onClick={() => signIn("zitadel", { callbackUrl: "/dashboard" })}
+            className="
+              w-full py-3 px-4 rounded-lg font-medium text-sm
+              bg-accent text-surface-0 cursor-pointer
+              hover:bg-accent-dim active:scale-[0.98]
+              transition-all duration-150
+              shadow-lg shadow-accent/20
+            "
+          >
+            {t("button")}
+          </button>
+        </div>
+
+        <p className="text-center text-text-muted text-[11px] mt-6 tracking-wide uppercase">
+          {t("footer")}
+        </p>
+      </div>
+    </div>
+  );
+}