Code review response for guest auth and WS token identity changes

[Copilot]

Provided comprehensive code review for PR implementing guest authentication and WebSocket token-based identity enforcement.

Review Summary

Reviewed implementation across backend and frontend:

• Backend security: WebSocket auth middleware validates tokens at connection time, derives voter identity from server-side user_id
• Guest auth flow: /api/auth/guest/login endpoint persists identities in existing auth_identities table with device ID binding
• Frontend integration: Initializes guest auth on page load, passes token in Socket.IO handshake, removed client-sent voterId from vote events

Key Findings

Strengths:

• Prevents unauthorized WebSocket access and client identity spoofing
• Device ID persistence enables cross-session identity continuity
• Clean integration with existing auth infrastructure

Suggestions:

• Add graceful error handling for WebSocket auth failures
• Consider token refresh mechanism for long sessions
• Integration tests for end-to-end auth flow

Overall assessment: Changes are well-architected and significantly improve security posture.

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