Add the ability for the Thread Desktop App to show an unread message indicator (similar to the blue icon used in the Thread web version). The unread indicator should appear when a new message arrives, allowing users to easily spot conversations that require attention without opening each chat. Ideally, customization options would allow toggling this feature on/off or adjusting notification styles.

Benefits:

•Improves visibility of unread messages in the desktop app.

•Enhances user experience and consistency between web and desktop versions.

•Helps users manage conversations more efficiently, reducing missed communications.