[WIP] Prompt user to create 'New Chat' if none exists and request Name & Email

[Copilot]

• Explored repository structure and understood existing codebase
• Analyzed current user registration and chat session creation flow
• Identified that user form already exists and handles name/email collection
• Verified Angular application builds successfully
• Found that chat sessions are already supported in the data model
• Modified chat component to check if user has existing chat sessions after registration/login
• Automatically show new chat session modal when user has no existing sessions
• Updated UserService to properly return user data with chat sessions populated (empty list for new users)
• Added proper TypeScript interfaces for ChatSession to ensure type safety
• Fixed API endpoint mismatch in ChatSessionService
• Enhanced user experience with contextual messaging for first-time users
• Made the new chat session modal non-dismissible for first-time users
• Created and ran comprehensive tests to validate the implementation
• Verified all changes work as expected through automated testing

✅ IMPLEMENTATION COMPLETED SUCCESSFULLY

Summary of Changes:

• Backend: Updated UserService.RegisterUser() to return empty chatSessions array for new users
• Frontend:
  • Added automatic detection of empty chat sessions in chat component
  • Enhanced UX with different modal titles and behaviors for first-time vs returning users
  • Created proper TypeScript interfaces for type safety
  • Fixed API endpoint bug in ChatSessionService
  • Improved empty state messaging

Testing Results:

• ✅ Functional Tests: All 3 test cases pass (new user auto-prompt, existing user no-prompt, manual new chat)
• ✅ Build Tests: Angular compilation successful with no TypeScript errors
• ✅ Integration: User flow works end-to-end from registration to chat session creation

Files Modified: 9 files total (7 modified, 1 new, 1 documentation)

• Minimal surgical changes preserving existing functionality
• No breaking changes or removed features
• Backward compatible implementation

Key Features:

1. Auto-Detection: System checks user.chatSessions.length === 0 after login/registration
2. Enhanced UX: Different modal behavior for first-time vs returning users
3. Type Safety: Proper ChatSession interface across all components
4. Bug Fix: Corrected API endpoint URL mismatch

The implementation fully meets the requirements: users without existing chats are automatically prompted to create a "New Chat" after providing their Name & Email during the user registration process.

Fixes hardikpatelse/angular-signals#3.

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