Rename macbook-air to mba

hosts/darwin/mba/home.nix

@@ -0,0 +1,11 @@
+{ config, pkgs, ... }:
+
+{
+  imports = [
+    ../home-default.nix
+  ];
+
+  # MacBook Air-specific home configuration
+  # Example: Laptop-specific tools, power management, etc.
+  
+}

hosts/darwin/mba/system.nix

@@ -0,0 +1,12 @@
+{ config, pkgs, ... }:
+
+{
+  # MacBook Air-specific configuration
+  networking.computerName = "mba";
+  networking.hostName = "mba";
+  
+  # Import common Darwin configuration
+  imports = [
+    ../system-default.nix
+  ];
+}