Added Alice and Bob as mock children in development mode to allow
tracking pages and UI to work without requiring authentication.
Changes:
- Updated childrenSlice to use childrenApi for consistent backend calls
- Pre-populated Redux store with 2 mock children (Alice, Bob)
- Set selectedChildId to first child by default
- Added mock token to localStorage for API client
This allows all tracking forms and ChildSelector components to work
in development without needing real login/auth flow.
TODO: Remove mocks and implement real authentication in production.
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Co-Authored-By: Claude <noreply@anthropic.com>