refactor(nix): inline style-check app package

src/dotfiles/apps.nix

@@ -6,24 +6,22 @@
 }:
 let
   pkgs = inputs.nixpkgs.legacyPackages.${system};
-
-  styleCheck = pkgs.writeShellApplication {
-    name = "style-check";
-    runtimeInputs = [
-      formatter
-      pkgs.statix
-      pkgs.deadnix
-    ];
-    text = ''
-      treefmt --fail-on-change
-      statix check .
-      deadnix --fail --no-lambda-pattern-names --no-underscore .
-    '';
-  };
 in
 {
   style-check = {
     type = "app";
-    program = lib.getExe styleCheck;
+    program = lib.getExe (pkgs.writeShellApplication {
+      name = "style-check";
+      runtimeInputs = [
+        formatter
+        pkgs.statix
+        pkgs.deadnix
+      ];
+      text = ''
+        treefmt --fail-on-change
+        statix check .
+        deadnix --fail --no-lambda-pattern-names --no-underscore .
+      '';
+    });
   };
 }