fix(HH-576): normalize realtime message timestamps (#148)

Co-authored-by: Rogee <rogee@ipao.vip>

frontend/app/javascript/dashboard/helper/specs/actionCable.spec.js

@@ -158,6 +158,70 @@ describe('ActionCableConnector - Copilot Tests', () => {
     ).not.toHaveBeenCalled();
   });
 
+  it('rejects malformed timestamps without updating conversation activity', async () => {
+    const currentMessage = {
+      id: 42,
+      conversation_id: 7,
+      content: 'current',
+      updated_at: '2026-08-24T02:00:00Z',
+    };
+    const state = {
+      allConversations: [
+        { id: 7, messages: [currentMessage], last_activity_at: 200 },
+      ],
+      selectedChatId: null,
+    };
+    useRealConversationDispatch(state);
+
+    await actionCable.onMessageCreated({
+      ...currentMessage,
+      content: 'malformed',
+      updated_at: 'not-a-timestamp',
+      conversation: { last_activity_at: 300 },
+    });
+
+    expect(state.allConversations[0].messages[0]).toBe(currentMessage);
+    expect(state.allConversations[0].last_activity_at).toBe(200);
+    expect(
+      DashboardAudioNotificationHelper.onNewMessage
+    ).not.toHaveBeenCalled();
+  });
+
+  it('keeps accepting events with a missing timestamp', async () => {
+    const state = {
+      allConversations: [
+        {
+          id: 7,
+          messages: [
+            {
+              id: 42,
+              conversation_id: 7,
+              content: 'current',
+              updated_at: '2026-08-24T02:00:00Z',
+            },
+          ],
+          last_activity_at: 200,
+        },
+      ],
+      selectedChatId: null,
+    };
+    useRealConversationDispatch(state);
+    const message = {
+      id: 42,
+      conversation_id: 7,
+      content: 'compatible update',
+      conversation: { last_activity_at: 300 },
+    };
+
+    await actionCable.onMessageCreated(message);
+
+    expect(state.allConversations[0].messages[0]).toEqual(message);
+    expect(state.allConversations[0].last_activity_at).toBe(300);
+    expect(DashboardAudioNotificationHelper.onNewMessage).toHaveBeenCalledWith(
+      message
+    );
+  });
+
   it('skips dashboard side effects when the conversation mutation is a no-op', async () => {
     setActivePinia(createPinia());
     const state = { allConversations: [], selectedChatId: null };
@@ -193,7 +257,7 @@ describe('ActionCableConnector - Copilot Tests', () => {
             {
               id: 42,
               conversation_id: 7,
-              updated_at: '2026-08-24T01:00:00Z',
+              updated_at: '1787533200',
             },
           ],
           last_activity_at: 100,

frontend/app/javascript/dashboard/store/modules/conversations/actions.js

@@ -19,6 +19,7 @@ import {
   handleVoiceCallUpdated,
   syncConversationCallVisibility,
 } from 'dashboard/helper/voice';
+import { isNewerTimestamp } from 'shared/helpers/timeHelper';
 
 export const hasMessageFailedWithExternalError = pendingMessage => {
   // This helper is used to check if the message has failed with an external error.
@@ -41,9 +42,7 @@ const getStoredMessage = (conversation, message) => {
 };
 
 const isNewerMessage = (currentMessage, message) =>
-  !currentMessage?.updated_at ||
-  !message.updated_at ||
-  message.updated_at > currentMessage.updated_at;
+  isNewerTimestamp(currentMessage?.updated_at, message.updated_at);
 
 // actions
 const actions = {