feat: persist portal invitation locales

app/invite/[token]/actions.ts

@@ -1,10 +1,20 @@
 "use server";
 
+import { cookies } from "next/headers";
 import { redirect } from "next/navigation";
 import {
   acceptPortalInvitation,
+  getPortalInvitationPreview,
   PortalInvitationError,
 } from "@/server/auth/invitations";
+import { buildLocaleCookie } from "@/server/i18n/locale";
+
+function inviteErrorCode(error: unknown): string {
+  if (!(error instanceof PortalInvitationError)) return "auth.messages.portalInviteFailed";
+  if (error.code === "INVITATION_EXPIRED") return "auth.invite.expired";
+  if (error.code === "INVITATION_NOT_PENDING") return "auth.invite.accepted";
+  return "auth.messages.portalInviteFailed";
+}
 
 export async function acceptInvitation(formData: FormData) {
   const token = String(formData.get("token") ?? "");
@@ -14,14 +24,10 @@ export async function acceptInvitation(formData: FormData) {
   try {
     await acceptPortalInvitation({ token, displayName, password });
   } catch (error) {
-    const message =
-      error instanceof PortalInvitationError
-        ? error.message
-        : "Portal hesabı oluşturulamadı.";
-    redirect(`/invite/${encodeURIComponent(token)}?error=true&message=${encodeURIComponent(message)}`);
+    redirect(`/invite/${encodeURIComponent(token)}?error=true&code=${inviteErrorCode(error)}`);
   }
 
-  redirect(
-    `/login?message=${encodeURIComponent("Portal hesabın oluşturuldu. Şimdi giriş yapabilirsin.")}`,
-  );
+  const locale = getPortalInvitationPreview(token)?.locale ?? "tr";
+  (await cookies()).set(buildLocaleCookie(locale));
+  redirect("/login?code=auth.invite.success");
 }