use treemft and also enable stylua

works well with CI

flake.lock

@@ -84,6 +84,22 @@
         "type": "github"
       }
     },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1733097829,
+        "narHash": "sha256-9hbb1rqGelllb4kVUCZ307G2k3/UhmA8PPGBoyuWaSw=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "2c15aa59df0017ca140d9ba302412298ab4bf22a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "home-manager": "home-manager",
@@ -91,7 +107,8 @@
         "nixpkgs-borg": "nixpkgs-borg",
         "nixpkgs-evolution": "nixpkgs-evolution",
         "nixpkgs-master": "nixpkgs-master",
-        "sops-nix": "sops-nix"
+        "sops-nix": "sops-nix",
+        "treefmt": "treefmt"
       }
     },
     "sops-nix": {
@@ -113,6 +130,24 @@
         "repo": "sops-nix",
         "type": "github"
       }
+    },
+    "treefmt": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1735135567,
+        "narHash": "sha256-8T3K5amndEavxnludPyfj3Z1IkcFdRpR23q+T0BVeZE=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "9e09d30a644c57257715902efbb3adc56c79cf28",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
     }
   },
   "root": "root",