bug: Only show message queue when users enter their second message

[imtuyethan]

Problem:
Right now, when users enter their first message, Jan shows "Message queue" message right away:

Screen.Recording.2023-12-11.at.3.27.36.PM.mov

Meanwhile, the correct flow is:

If the thread uses the same model as the current active model: Users send message & receive response normally

If the thread uses a different model

• Once users enter the first message -> send that message + start model:
  
  (Inputing message)

(Message sent + starting model)

• When model is starting, we will not disable the input field, if users continue to input...
  
• Once they click send, it cannot be sent and show "message queue" status:
  

Note that the "message queue" message should disappear after 3 seconds, and if users type send again while model is still starting -> show that message again

Figma flow: https://www.figma.com/file/ytn1nRZ17FUmJHTlhmZB9f/Jan-App?type=design&node-id=549-43054&mode=design&t=59imhnuCTJu4oesf-4

[urmauur]

@imtuyethan CMIIW in your video you don't have active model, so that why you got Message queue

[imtuyethan]

@imtuyethan CMIIW in your video you don't have active model, so that why you got Message queue

Yes, what i mean is that if i don't have active model, it should start the model without showing message "Message Queue". You can read the flow i typed out.

[louis-menlo]

Sorry @urmauur, let us align on this issue for the appropriate fix. Might #886 is the one should be done before this.

[freelerobot]

KIV'ing this for the future when we do allow model switching in existing threads