mobile nav, locale-preserving navigation, accent button contrast

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

@@ -1,11 +1,12 @@
 "use client";
 
 import { signIn } from "next-auth/react";
-import { useTranslations } from "next-intl";
-import Link from "next/link";
+import { useTranslations, useLocale } from "next-intl";
+import { Link, getPathname } from "@/i18n/navigation";
 
 export default function LoginPage() {
   const t = useTranslations("login");
+  const locale = useLocale();
 
   return (
     <div className="fixed inset-0 flex items-center justify-center bg-surface-0">
@@ -39,7 +40,14 @@ export default function LoginPage() {
           </p>
 
           <button
-            onClick={() => signIn("zitadel", { callbackUrl: "/dashboard" })}
+            onClick={() =>
+              signIn("zitadel", {
+                // Preserve the active locale across the OIDC round-trip.
+                // A bare "/dashboard" would resolve to the default (de)
+                // locale on return; getPathname prefixes it as needed.
+                callbackUrl: getPathname({ href: "/dashboard", locale }),
+              })
+            }
             className="
               w-full py-3 px-4 rounded-lg font-medium text-sm
               bg-accent text-surface-0 cursor-pointer