fix: Chat Input Reset and Send Button Disable Logic in ChatRoom Component

[Prasanjeet-Microsoft]

Purpose

This PR resolves bugs in the ChatRoom component related to the chat input field

• Ensures the textarea is properly cleared and reset after starting a new topic.
• Disables the send button when the input is empty or the chat is loading, preventing unintended or empty submissions.

Does this introduce a breaking change?

• Yes
• No

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid:

• After starting a new topic, confirm the chat input is fully cleared and cannot send empty messages.
• The send button should be disabled when the input is empty or during loading states.
• Ensure a smooth user experience with no regressions in chat operations.

[github-actions]

🎉 This PR is included in version 1.0.0 🎉

The release is available on GitHub release

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