Add message-level feedback with thumbs up/down buttons

[xingyaoww]

This PR adds thumbs up and thumbs down buttons to each assistant message in the chat interface.

Changes:

• Added a new UserFeedbackAction type for sending feedback events
• Updated the Message type to include a feedback property
• Created a new MessageFeedback component to display thumbs up/down buttons
• Modified the trajectory-level feedback to use the same mechanism
• Removed the old feedback modal in favor of direct WebSocket events
• Added toast notifications for feedback confirmation

Feedback can now be provided at both the message level and trajectory level, with consistent handling for both.

Testing:

• Fixed all TypeScript errors and linting issues
• All tests are passing
• Verified the build process completes successfully

---

To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:10cdf88-nikolaik   --name openhands-app-10cdf88   docker.all-hands.dev/all-hands-ai/openhands:10cdf88