fix: reset chat input character count on "New Topic" button click

[Prasanjeet-Microsoft]

Purpose

• This PR addresses a bug where the chat input box token counter did not reset when starting a new topic

  Changes:

  • Added a dynamic 'key' to the Textarea to force remount and reset internal state on new topic.
  • Ensured 'textAreaValue' is cleared on new topic click.

• This ensures consistent behavior for users when they start a new chat session.

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:

1. When you click the "+" (New Topic) button:

   • The input text area is cleared (no residual text remains).
   • The character/token counter displays 0/500.

2. After starting a new topic:

   • Typing into the input box correctly updates the counter from 0/500 upwards.
   • Ensure no console errors or warnings appear during this interaction.

[github-actions]

🎉 This PR is included in version 1.0.0 🎉

The release is available on GitHub release

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