bug: Thread - Provide message with multiple lines and the textbox is missing scrollbar to view all the text

[Van-QA]

Describe the bug
The message box containing multiple lines of text lacks a scrollbar, making it difficult to navigate through the entire content. This issue impacts the usability of the application, especially when dealing with lengthy messages.

Steps to reproduce
Steps to reproduce the behavior:

1. Go to Thread
2. Click on msg box on and provide a long msg with multiple lines
3. Try to view all the long msg

Screenshots

Environment details

• Operating System: MacOS
• Jan Version: latest nightly build
• Processor: Apple M2 Pro
• RAM: 16GB

Logs
If the cause of the error is not clear, kindly provide your usage logs:

• tail -n 50 ~/jan/logs/app.log if you are using the UI
• tail -n 50 ~/jan/logs/server.log if you are using the local api server
  Making sure to redact any private information.

Additional context
Add any other context or information that could be helpful in diagnosing the problem.