Updated Flatpak commands to use the --user flag, ensuring all operations (install, uninstall, update) affect only the current user's Flatpaks. Also updated the Zen browser Flatpak ID and improved error handling during installation.
Flatpak management has been refactored from Home Manager and nix-flatpak to a new system/flatpak.nix module, now imported in system/common.nix. This centralizes Flatpak enablement and declarative app management at the system level, simplifying configuration and maintenance.
Integrates the nix-flatpak module for declarative Flatpak management. Enables Flatpak system-wide, configures Home Manager to manage Flatpak apps, and adds an example Flatpak package with automatic weekly updates.
Replaces nerdfonts.override with specific nerd-fonts packages for FiraCode, JetBrainsMono, and Iosevka in desktop and laptop configurations. Also corrects PulseAudio configuration by enabling it under services.pulseaudio instead of hardware.pulseaudio in common.nix.
Add a NixOS system configuration using flakes, supporting multiple hosts (desktop, laptop, my-machine) with shared and per-host settings. Includes Home Manager integration, user-level and system-level package management, and example hardware configuration placeholders. Provides a README with setup instructions and a .gitignore for common Nix and editor artifacts.
