feat: add little-rascal laptop configuration and deployment

- Add complete NixOS configuration for little-rascal laptop
- Include Niri window manager and CLI-focused setup
- Add hardware configuration for laptop hardware
- Include deployment script for little-rascal
- Update flake.nix to include little-rascal as build target
- Add deploy-rs configuration for little-rascal deployment

The little-rascal laptop is now fully integrated into the Home Lab
infrastructure with complete NixOS configuration management.

machines/little-rascal/configuration.nix

@@ -1,6 +1,5 @@
 # Little Rascal - Development Laptop Configuration
 # Based on congenital-optimist with laptop-specific adjustments
-
 {
   config,
   pkgs,
@@ -11,38 +10,39 @@
 }: {
   imports = [
     ./hardware-configuration.nix
-    
+
     # Common modules
     ../../modules/common/base.nix
     ../../modules/common/nix.nix
     ../../modules/common/tty.nix
     ../../modules/common/emacs.nix
-    
+
     # Desktop
     ../../modules/desktop/niri.nix
+    ../../modules/desktop/cosmic.nix
     ../../modules/desktop/fonts.nix
-    
-    # Development 
+
+    # Development
     ../../modules/development/tools.nix
     ../../modules/ai/claude-code.nix
-    
+
     # Users
     ../../modules/users/geir.nix
     ../../modules/users/common.nix
     ../../modules/users/shell-aliases.nix
-    
+
     # Virtualization
     ../../modules/virtualization/libvirt.nix
     ../../modules/virtualization/incus.nix
     ../../modules/virtualization/podman.nix
-    
+
     # Audio
     ../../modules/sound/pipewire.nix
-    
+
     # Network
     ../../modules/network/common.nix
     ../../modules/network/extraHosts.nix
-    
+
     # Security
     ../../modules/security/ssh-keys.nix
   ];
@@ -50,26 +50,26 @@
   networking = {
     hostName = "little-rascal";
     networkmanager.enable = true;
-    
+
     # Tailscale for home lab access
     firewall = {
       enable = true;
-      allowedUDPPorts = [ 41641 ]; # Tailscale
-      allowedTCPPorts = [ 22 ]; # SSH
+      allowedUDPPorts = [41641]; # Tailscale
+      allowedTCPPorts = [22]; # SSH
     };
   };
 
-  # Boot configuration  
+  # Boot configuration
   boot = {
     loader = {
       systemd-boot.enable = true;
       efi.canTouchEfiVariables = true;
       timeout = 3;
     };
-    
-    kernelModules = [ "kvm-amd" "zram" ];
+
+    kernelModules = ["kvm-amd" "zram"];
     tmp.cleanOnBoot = true;
-    
+
     # zram swap like other machines
     kernel.sysctl."vm.swappiness" = 180;
   };
@@ -92,7 +92,7 @@
     # Power management for laptop
     power-profiles-daemon.enable = true;
     upower.enable = true;
-    
+
     # Display manager
     greetd = {
       enable = true;
@@ -103,12 +103,12 @@
         };
       };
     };
-    
+
     # Essential services
     tailscale.enable = true;
     blueman.enable = true;
     printing.enable = true;
-    
+
     # Location services for time zone
     geoclue2.enable = true;
   };
@@ -123,4 +123,4 @@
 
   # System version
   system.stateVersion = "25.05";
-}
+}