fix(auth): surface failed account save to the user

A skipped or failed post-login account save only wrote a log entry, so
the user believed the account was saved. Both save paths (loginMutation
PIN guard and PendingAccountSaveModal catch) now show an error toast.

components/PendingAccountSaveModal.tsx

@@ -1,13 +1,16 @@
 import { useAtom, useAtomValue } from "jotai";
 import type React from "react";
 import { useEffect } from "react";
+import { useTranslation } from "react-i18next";
 import { Platform } from "react-native";
+import { toast } from "sonner-native";
 import { SaveAccountModal } from "@/components/SaveAccountModal";
 import {
   pendingAccountSaveAtom,
   useJellyfin,
   userAtom,
 } from "@/providers/JellyfinProvider";
+import { writeErrorLog } from "@/utils/log";
 
 /**
  * Post-login save-account prompt. Login flows (password or Quick Connect)
@@ -19,6 +22,7 @@ export const PendingAccountSaveModal: React.FC = () => {
   const [pending, setPending] = useAtom(pendingAccountSaveAtom);
   const user = useAtomValue(userAtom);
   const { saveCurrentAccount } = useJellyfin();
+  const { t } = useTranslation();
 
   // A logout before answering drops the intent — it must not resurface on
   // the next (possibly different) login.
@@ -37,7 +41,10 @@ export const PendingAccountSaveModal: React.FC = () => {
         const serverName = pending?.serverName;
         setPending(null);
         saveCurrentAccount({ securityType, pinCode, serverName }).catch(
-          (error) => console.warn("Failed to save account:", error),
+          (error) => {
+            writeErrorLog(`Failed to save account: ${error?.message ?? error}`);
+            toast.error(t("save_account.not_saved"));
+          },
         );
       }}
     />