Complete NixOS rewrite: Transform Omarchy from Arch to declarative NixOS

- Replace shell script-based Arch installation with declarative NixOS configuration
- Implement flake-based architecture for reproducible builds
- Add modular system with feature flags (Docker, gaming, development, etc.)
- Create declarative theme system with Tokyo Night and Catppuccin
- Convert utility scripts to Nix packages with proper derivations
- Add comprehensive development environments (Rust, Go, Python, Node.js, C/C++)
- Implement Home Manager integration for user environment management
- Add interactive installer with theme selection and feature configuration
- Update documentation for NixOS-specific workflows and commands
- Provide atomic updates with rollback capability

This maintains all aesthetic and functional benefits of original Omarchy
while gaining NixOS power: reproducibility, version control, and atomic updates.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

modules/themes/catppuccin.nix

@@ -0,0 +1,198 @@
+{ config, pkgs, lib, ... }:
+
+{
+  # Catppuccin Mocha theme configuration
+  config = {
+    # Color palette
+    environment.variables = {
+      OMARCHY_THEME = "catppuccin";
+      OMARCHY_THEME_BG = "#1e1e2e";
+      OMARCHY_THEME_FG = "#cdd6f4";
+      OMARCHY_THEME_ACCENT = "#cba6f7";
+    };
+
+    # Home-manager theme configuration
+    home-manager.users.${config.omarchy.user or "user"} = {
+      # Alacritty theme
+      programs.alacritty.settings.colors = {
+        primary = {
+          background = "#1e1e2e";
+          foreground = "#cdd6f4";
+          dim_foreground = "#a6adc8";
+          bright_foreground = "#cdd6f4";
+        };
+
+        cursor = {
+          text = "#1e1e2e";
+          cursor = "#f5e0dc";
+        };
+
+        vi_mode_cursor = {
+          text = "#1e1e2e";
+          cursor = "#b4befe";
+        };
+
+        search = {
+          matches = {
+            foreground = "#1e1e2e";
+            background = "#a6adc8";
+          };
+          focused_match = {
+            foreground = "#1e1e2e";
+            background = "#a6e3a1";
+          };
+        };
+
+        hints = {
+          start = {
+            foreground = "#1e1e2e";
+            background = "#f9e2af";
+          };
+          end = {
+            foreground = "#1e1e2e";
+            background = "#a6adc8";
+          };
+        };
+
+        selection = {
+          text = "#1e1e2e";
+          background = "#f5e0dc";
+        };
+
+        normal = {
+          black = "#45475a";
+          red = "#f38ba8";
+          green = "#a6e3a1";
+          yellow = "#f9e2af";
+          blue = "#89b4fa";
+          magenta = "#f5c2e7";
+          cyan = "#94e2d5";
+          white = "#bac2de";
+        };
+
+        bright = {
+          black = "#585b70";
+          red = "#f38ba8";
+          green = "#a6e3a1";
+          yellow = "#f9e2af";
+          blue = "#89b4fa";
+          magenta = "#f5c2e7";
+          cyan = "#94e2d5";
+          white = "#a6adc8";
+        };
+
+        dim = {
+          black = "#45475a";
+          red = "#f38ba8";
+          green = "#a6e3a1";
+          yellow = "#f9e2af";
+          blue = "#89b4fa";
+          magenta = "#f5c2e7";
+          cyan = "#94e2d5";
+          white = "#bac2de";
+        };
+      };
+
+      # GTK theme
+      gtk = {
+        theme = {
+          name = "Catppuccin-Mocha-Standard-Lavender-Dark";
+          package = pkgs.catppuccin-gtk.override {
+            accents = ["lavender"];
+            size = "standard";
+            variant = "mocha";
+          };
+        };
+        iconTheme = {
+          name = "Papirus-Dark";
+          package = pkgs.catppuccin-papirus-folders.override {
+            flavor = "mocha";
+            accent = "lavender";
+          };
+        };
+      };
+
+      # Starship theme
+      programs.starship.settings = {
+        palette = "catppuccin_mocha";
+
+        palettes.catppuccin_mocha = {
+          rosewater = "#f5e0dc";
+          flamingo = "#f2cdcd";
+          pink = "#f5c2e7";
+          mauve = "#cba6f7";
+          red = "#f38ba8";
+          maroon = "#eba0ac";
+          peach = "#fab387";
+          yellow = "#f9e2af";
+          green = "#a6e3a1";
+          teal = "#94e2d5";
+          sky = "#89dceb";
+          sapphire = "#74c7ec";
+          blue = "#89b4fa";
+          lavender = "#b4befe";
+          text = "#cdd6f4";
+          subtext1 = "#bac2de";
+          subtext0 = "#a6adc8";
+          overlay2 = "#9399b2";
+          overlay1 = "#7f849c";
+          overlay0 = "#6c7086";
+          surface2 = "#585b70";
+          surface1 = "#45475a";
+          surface0 = "#313244";
+          base = "#1e1e2e";
+          mantle = "#181825";
+          crust = "#11111b";
+        };
+
+        format = ''
+          [╭─](surface2)$username[@](yellow)$hostname [in ](text)$directory$git_branch$git_status$cmd_duration
+          [╰─](surface2)$character
+        '';
+
+        character = {
+          success_symbol = "[➜](green)";
+          error_symbol = "[➜](red)";
+        };
+
+        directory = {
+          style = "blue";
+        };
+
+        git_branch = {
+          style = "mauve";
+          symbol = " ";
+        };
+
+        git_status = {
+          style = "red";
+        };
+      };
+
+      # Mako notification theme
+      services.mako = {
+        backgroundColor = "#1e1e2e";
+        textColor = "#cdd6f4";
+        borderColor = "#cba6f7";
+        progressColor = "#cba6f7";
+        defaultTimeout = 5000;
+        borderRadius = 10;
+        borderSize = 2;
+        font = "JetBrainsMono Nerd Font 10";
+        padding = "10";
+        margin = "20";
+      };
+    };
+
+    # Hyprland theme colors
+    environment.systemPackages = with pkgs; [
+      (writeShellScriptBin "set-catppuccin-colors" ''
+        #!/usr/bin/env bash
+        # Set Catppuccin Mocha colors in Hyprland
+        hyprctl keyword general:col.active_border "rgba(cba6f7ee) rgba(89b4faee) 45deg"
+        hyprctl keyword general:col.inactive_border "rgba(585b70aa)"
+        hyprctl keyword decoration:col.shadow "rgba(1e1e2eee)"
+      '')
+    ];
+  };
+}