• Updates flake to use unstable nixpkgs for gaming packages
• Replaces custom gamescope setup with play flake integration
• Adds wrappers for Steam, Heroic, and Lutris desktop entries
• Simplifies host gaming configuration by delegating to play
• Remove proton-cachyos, handled by play now
- Added cursor theme and package for x11 environment
- Updated environment variables for Gamescope and Lutris integration.
- Improved Steam and Lutris desktop entries
- Using _gid pkgs now, and gamescope-wsi
• Splits gamescope-run logic into its own file
• Extracts mangohud settings into a dedicated file
• Cleans up default config
• Wraps 'steam' command with gamescope-run
