refactor(playground): extract message update utilities

- move assistant message update helpers into a focused playground utility.
- keep error-state message updates separate from core message construction helpers.

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

@@ -19,6 +19,7 @@ For commercial licensing, please contact support@quantumnous.com
 export * from './message-utils'
 export * from './message-reasoning-utils'
 export * from './message-streaming-utils'
+export * from './message-update-utils'
 export * from './payload-builder'
 export * from './storage'
 export * from './message-styles'

web/default/src/features/playground/lib/message-update-utils.ts

@@ -0,0 +1,61 @@
+/*
+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, MESSAGE_ROLES, MESSAGE_STATUS } from '../constants'
+import type { Message } from '../types'
+import { updateCurrentVersionContent } from './message-utils'
+
+/**
+ * Update the last assistant message with an error.
+ */
+export function updateAssistantMessageWithError(
+  messages: Message[],
+  errorMessage: string,
+  errorCode?: string
+): Message[] {
+  return updateLastAssistantMessage(messages, (message) => {
+    const updatedMessage = updateCurrentVersionContent(
+      message,
+      `${ERROR_MESSAGES.API_REQUEST_ERROR}: ${errorMessage}`
+    )
+
+    return {
+      ...updatedMessage,
+      status: MESSAGE_STATUS.ERROR,
+      isReasoningStreaming: false,
+      errorCode: errorCode || null,
+    }
+  })
+}
+
+/**
+ * Update the most recent assistant message, preserving the array when absent.
+ */
+export function updateLastAssistantMessage(
+  messages: Message[],
+  updater: (message: Message) => Message
+): Message[] {
+  if (messages.length === 0) return messages
+
+  const last = messages[messages.length - 1]
+  if (!last || last.from !== MESSAGE_ROLES.ASSISTANT) return messages
+
+  const updated = [...messages]
+  updated[updated.length - 1] = updater(last)
+  return updated
+}

web/default/src/features/playground/lib/message-utils.ts

@@ -17,7 +17,7 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
 For commercial licensing, please contact support@quantumnous.com
 */
 import { nanoid } from 'nanoid'
-import { MESSAGE_ROLES, MESSAGE_STATUS, ERROR_MESSAGES } from '../constants'
+import { MESSAGE_ROLES, MESSAGE_STATUS } from '../constants'
 import type {
   Message,
   MessageVersion,
@@ -163,47 +163,3 @@ export function isValidMessage(message: Message): boolean {
 
   return true
 }
-
-/**
- * Update the last assistant message with an error
- * @param messages - Current messages array
- * @param errorMessage - Error message to display
- * @returns Updated messages array
- */
-export function updateAssistantMessageWithError(
-  messages: Message[],
-  errorMessage: string,
-  errorCode?: string
-): Message[] {
-  return updateLastAssistantMessage(messages, (message) => {
-    const updatedMessage = updateCurrentVersionContent(
-      message,
-      `${ERROR_MESSAGES.API_REQUEST_ERROR}: ${errorMessage}`
-    )
-    return {
-      ...updatedMessage,
-      status: MESSAGE_STATUS.ERROR,
-      isReasoningStreaming: false,
-      errorCode: errorCode || null,
-    }
-  })
-}
-
-/**
- * Helper function to update the last assistant message
- * @param messages - Current messages array
- * @param updater - Function to update the message
- * @returns Updated messages array or original if no assistant message found
- */
-export function updateLastAssistantMessage(
-  messages: Message[],
-  updater: (message: Message) => Message
-): Message[] {
-  if (messages.length === 0) return messages
-  const last = messages[messages.length - 1]
-  if (!last || last.from !== MESSAGE_ROLES.ASSISTANT) return messages
-
-  const updated = [...messages]
-  updated[updated.length - 1] = updater(last)
-  return updated
-}