Added mock test user to auth slice initialState to provide familyId for children fetching in development environment. Issue: Tracking pages couldn't fetch children because state.auth.user was null, resulting in no familyId for API calls. Solution: Mock user with test familyId in development mode only. TODO: Implement proper authentication flow in production. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>