[AB-3423] Fix user authentication bug

implementation_ab-3423.md

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+# Implementation for AB-3423
+
+## Summary
+Fix user authentication bug
+
+## Description
+Fix user authentication bug
+
+The login form is not validating email addresses properly. Users can submit invalid email formats and this causes errors in the backend.
+
+Requirements:
+- Add proper email validation to the frontend
+- Ensure backend also validates email format
+- Show user-friendly error messages
+- Add tests for email validation
+
+## Generated Code
+```
+## Mock AI Response for Testing
+
+**Task:** Fix user authentication bug
+
+**Analysis:** This is a mock response since Claude Code CLI is not available. 
+The task "Fix user authentication bug" has been received and would normally be processed by AI.
+
+**Implementation Plan:**
+1. Analyze the requirements: Fix user authentication bug
+
+The login form is not validating email addresses properly. Users can submit invalid email formats and this causes errors in the backend.
+
+Requirements:
+- Add proper email validation to the frontend
+- Ensure backend also validates email format
+- Show user-friendly error messages
+- Add tests for email validation
+2. Generate appropriate code changes
+3. Create necessary files and modifications
+4. Apply best practices for the detected project type
+
+**Mock Code Changes:**
+- Files to be modified: (would be determined by AI analysis)
+- Code snippets: (would be generated based on requirements)
+- Tests: (would be created as needed)
+
+**Note:** This is a mock response for testing purposes. In production, Claude Code CLI would provide actual AI-generated solutions.
+
+```