🔧 refactor: customUserVar Error Normalization (#8950)

* fix: localization string had unused template var

* fix: add normalizeHttpError to hopefully stop UI hangs when an error is returned in UserController

- Ensures updateUserPluginsController always returns valid HTTP status codes instead of undefined
- Add normalizeHttpError() helper to safely extract status/message from errors
- Default to 400 status code when Error.status is undefined/invalid

* refactor: move normalizeHttpError to packages/api

packages/api/src/utils/http.ts

@@ -0,0 +1,26 @@
+/**
+ * Normalizes an error-like object into an HTTP status and message.
+ * Ensures we always respond with a valid numeric status to avoid UI hangs.
+ */
+export function normalizeHttpError(
+  err: Error | { status?: number; message?: string } | unknown,
+  fallbackStatus = 400,
+) {
+  let status = fallbackStatus;
+  if (err && typeof err === 'object' && 'status' in err && typeof err.status === 'number') {
+    status = err.status;
+  }
+
+  let message = 'An error occurred.';
+  if (
+    err &&
+    typeof err === 'object' &&
+    'message' in err &&
+    typeof err.message === 'string' &&
+    err.message.length > 0
+  ) {
+    message = err.message;
+  }
+
+  return { status, message };
+}

packages/api/src/utils/index.ts

@@ -12,3 +12,4 @@ export * from './openid';
 export * from './tempChatRetention';
 export { default as Tokenizer } from './tokenizer';
 export * from './yaml';
+export * from './http';