Show human-readable player names instead of player IDs in both desktop
and web clients. Player names are now stored in the Snake model and
synchronized across all clients.
Changes:
- Added player_name field to Snake model
- Updated create_snake() to accept player_name parameter
- Desktop client shows "YOU:" or "PlayerName:"
- Web client shows "You (Name)" or "Name"
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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