refactor(playground): extract request error parsing

- move non-stream request error extraction into a shared utility so the chat handler stays focused on request flow.
- preserve the existing response message, error code, and fallback priority for failed chat completions.

web/default/src/features/playground/hooks/use-chat-handler.ts

@@ -27,6 +27,7 @@ import {
   processStreamingContent,
   finalizeMessage,
   updateCurrentVersionContent,
+  parseRequestErrorDetails,
 } from '../lib'
 import type { Message, PlaygroundConfig, ParameterEnabled } from '../types'
 import { useStreamRequest } from './use-stream-request'
@@ -175,18 +176,8 @@ export function useChatHandler({
       } catch (error: unknown) {
         if (abortController.signal.aborted) return
 
-        const err = error as {
-          response?: {
-            data?: { message?: string; error?: { code?: string } }
-          }
-          message?: string
-        }
-        handleStreamError(
-          err?.response?.data?.message ||
-            err?.message ||
-            ERROR_MESSAGES.API_REQUEST_ERROR,
-          err?.response?.data?.error?.code || undefined
-        )
+        const { errorCode, errorMessage } = parseRequestErrorDetails(error)
+        handleStreamError(errorMessage, errorCode)
       } finally {
         if (requestIdRef.current === requestId) {
           abortControllerRef.current = null

web/default/src/features/playground/lib/index.ts

@@ -21,3 +21,4 @@ export * from './payload-builder'
 export * from './storage'
 export * from './message-styles'
 export * from './stream-utils'
+export * from './request-error-utils'

web/default/src/features/playground/lib/request-error-utils.ts

@@ -0,0 +1,48 @@
+/*
+Copyright (C) 2023-2026 QuantumNous
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+For commercial licensing, please contact support@quantumnous.com
+*/
+import { ERROR_MESSAGES } from '../constants'
+
+type RequestErrorLike = {
+  message?: string
+  response?: {
+    data?: {
+      error?: {
+        code?: string
+      }
+      message?: string
+    }
+  }
+}
+
+export type RequestErrorDetails = {
+  errorCode?: string
+  errorMessage: string
+}
+
+export function parseRequestErrorDetails(error: unknown): RequestErrorDetails {
+  const requestError = error as RequestErrorLike
+
+  return {
+    errorCode: requestError?.response?.data?.error?.code || undefined,
+    errorMessage:
+      requestError?.response?.data?.message ||
+      requestError?.message ||
+      ERROR_MESSAGES.API_REQUEST_ERROR,
+  }
+}