test(ui): add interaction tests for ChatWindow (#551)

[annukumar123]

Summary

This PR adds unit and interaction test coverage for ChatWindow.jsx using Vitest and React Testing Library, completing requirements for issue #551.

Changes Included

• Added interaction test suite to verify:
  1. Message Submission: Clicking the Send button triggers onSend callback with input text and resets the textarea.
  2. Streaming Control: Clicking the Stop button during message generation invokes the onStop handler.
  3. Message Filtering: Typing into the search input dynamically filters messages rendered in the chat view, and clearing search restores all messages.

Testing & Verification

Ran test suite locally via Vitest:

npx vitest run src/components/ChatWindow.test.jsx

[vercel]

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[annukumar123]

@imDarshanGK
It is perfect . you can verify now