⌚ fix: Wait for Initial Message Save & Correct Latest Message (#3399)

* chore: assistants, unsupported assistant, better logging

* chore: remove unnecessary logger in validateAssistant middleware

* fix: resolve initial conversation save/promise before saving response

* chore: Import and organize dependencies in Speech component

* fix: conversation statefulness
- Latest Message (at index 0) should not be reset if existing convo
- add debugging context for clearAllLatestMessages
- Added logging concerning latest Message updates (dev mode only)
- update latest message Set logic, also checks for change in conversation Id
- consolidated latest message helpers to client/src/utils/messages.ts

api/app/clients/specs/BaseClient.test.js

@@ -1,7 +1,7 @@
 const { Constants } = require('librechat-data-provider');
 const { initializeFakeClient } = require('./FakeClient');
 
-jest.mock('../../../lib/db/connectDb');
+jest.mock('~/lib/db/connectDb');
 jest.mock('~/models', () => ({
   User: jest.fn(),
   Key: jest.fn(),
@@ -631,5 +631,32 @@ describe('BaseClient', () => {
         }),
       );
     });
+
+    test('userMessagePromise is awaited before saving response message', async () => {
+      // Mock the saveMessageToDatabase method
+      TestClient.saveMessageToDatabase = jest.fn().mockImplementation(() => {
+        return new Promise((resolve) => setTimeout(resolve, 100)); // Simulate a delay
+      });
+
+      // Send a message
+      const messagePromise = TestClient.sendMessage('Hello, world!');
+
+      // Wait a short time to ensure the user message save has started
+      await new Promise((resolve) => setTimeout(resolve, 50));
+
+      // Check that saveMessageToDatabase has been called once (for the user message)
+      expect(TestClient.saveMessageToDatabase).toHaveBeenCalledTimes(1);
+
+      // Wait for the message to be fully processed
+      await messagePromise;
+
+      // Check that saveMessageToDatabase has been called twice (once for user message, once for response)
+      expect(TestClient.saveMessageToDatabase).toHaveBeenCalledTimes(2);
+
+      // Check the order of calls
+      const calls = TestClient.saveMessageToDatabase.mock.calls;
+      expect(calls[0][0].isCreatedByUser).toBe(true); // First call should be for user message
+      expect(calls[1][0].isCreatedByUser).toBe(false); // Second call should be for response message
+    });
   });
 });