feat(flake): add nix-darwin to flake

WARNING: This commit includes additions to flake.nix and flake.lock.

flake.lock

@@ -337,6 +337,27 @@
         "type": "github"
       }
     },
+    "nix-darwin": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1751313918,
+        "narHash": "sha256-HsJM3XLa43WpG+665aGEh8iS8AfEwOIQWk3Mke3e7nk=",
+        "owner": "nix-darwin",
+        "repo": "nix-darwin",
+        "rev": "e04a388232d9a6ba56967ce5b53a8a6f713cdfcf",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-darwin",
+        "ref": "master",
+        "repo": "nix-darwin",
+        "type": "github"
+      }
+    },
     "nix-index-database": {
       "inputs": {
         "nixpkgs": [
@@ -467,6 +488,7 @@
         "impermanence": "impermanence",
         "import-tree": "import-tree",
         "make-shell": "make-shell",
+        "nix-darwin": "nix-darwin",
         "nix-index-database": "nix-index-database",
         "nixpkgs": "nixpkgs",
         "nur": "nur",

flake.nix

@@ -22,6 +22,11 @@
       url = "github:nix-community/home-manager";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    # nix darwin provides declarative mac configuration
+    nix-darwin = {
+      url = "github:nix-darwin/nix-darwin/master";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     # the nix user repository for mainly firefox extensions
     nur = {
       url = "github:nix-community/NUR";