wire reward thumbupdown with event bus

[Douglasymlai]

Pull Request

Related Issue

Closes #

Description

This PR connects the existing message thumbs-up/down controls to the application event bus so user feedback can be consumed by edition-specific analytics adapters.

What changed

• Adds a typed message_feedback app event containing:
  • rating (up or down)
  • logical message ID
  • Run ID, when available
  • message lifecycle step
• Propagates Run and message metadata through both narrative and legacy timeline paths.
• Records at most one rating per Run-scoped message during an app session.
• Preserves the selected rating when a message card remounts, such as after switching timeline modes.
• Keeps message content and agent names out of the feedback event.
• Adds unit coverage for event payloads, logical identity propagation, duplicate prevention, and remount behavior.

Testing Evidence (REQUIRED)

Automated coverage was added for:

• thumbs-up and thumbs-down event emission
• logical message and Run identifiers
• single-rating enforcement
• feedback persistence across component remounts
• metadata propagation through narrative and legacy timeline renderers

• I have included human-verified testing evidence in this PR.
• This PR includes frontend/UI changes, and I attached screenshot(s) or screen recording(s).
• No frontend/UI changes in this PR.

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Contribution Guidelines Acknowledgement

• I have read and agree to the Eigent Contribution Guideline