FEAT: Read more option for long messages

[r3yc0n1c]

As an EmbeddedChat developer

I need to:
Implement a "Read more" option for long messages.

So That:
Users can view long messages in a more manageable way without overwhelming the chat interface, improving user experience and readability.

Acceptance Criteria

• The "Read more" button is visible when a message exceeds a certain character length (e.g., 150 characters).
• Clicking "Read more" expands the message to show its full content.
• The "Read more" button changes to "Read less" once the full message is revealed, allowing users to collapse it back.
• The expanded message maintains proper formatting and displays without causing layout issues.
• The feature works consistently across different devices and screen sizes.

[r3yc0n1c]

I'm working on this