Create a custom Live Linux desktop ISO image.

System & Package Requirements: - Desktop Environment: Customized with a macOS look and feel (e.g., KDE Plasma with WhiteSur theme, top global menu bar, left-aligned window controls, and dock). - Default Shell: Fish shell (set as default interactive shell). - Terminal & Utilities: Include Tmux and Nix package manager. - live image

Please generate a bootable Live ISO artifact with live user auto-login.