fix: fix issue with chat-input-area clearing during Responding state.

[Woo0ood]

Summary

Resolves #11849

This PR is a resubmission as requested, as part of the now-closed #11850 .

Fixed

• Fix the issue where the chat-input-area was cleared in response state
  • Fixed the issue where the input box content was cleared after sending a message in response state. Now, it will check if the state is in response mode, and if so, it will display a prompt and retain the input box content.

Modification Details

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This pull request includes changes to the ChatInputArea component to handle the scenario when a response is already being processed. The most important changes include adding a new isResponding property to the component's props and implementing a check to notify the user if a response is in progress.

Enhancements to ChatInputArea component:

• web/app/components/base/chat/chat/chat-input-area/index.tsx: Added isResponding property to ChatInputAreaProps and included it in the component's destructured props. [1] [2]
• web/app/components/base/chat/chat/chat-input-area/index.tsx: Implemented a check in the handleSend function to notify the user if a response is already being processed, preventing multiple simultaneous responses.

Integration with Chat component:

• web/app/components/base/chat/chat/index.tsx: Passed the isResponding prop to the ChatInputArea component to ensure the new functionality is integrated.

Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods