Previously all ghost trains used the local player's trainPosition,
causing them to render at the same location (hidden behind local train).
Now each ghost train uses its own player.position from multiplayer state,
allowing them to be visible at different positions on the track.
Also added logging to show ghost train positions for debugging.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
