treewide: use inputs instead of self

hosts/common.nix

@@ -1,21 +1,22 @@
 {
+  inputs,
+  config,
   pkgs,
-  self,
   ...
 }:
 
 {
   imports = [
-    self.inputs.agenix.nixosModules.age
-    self.inputs.home-manager.nixosModule
+    inputs.agenix.nixosModules.age
+    inputs.home-manager.nixosModule
     ../modules/nixos
   ];
 
   nixpkgs.overlays = [
-    self.inputs.agenix.overlays.default
+    inputs.agenix.overlays.default
     (import ../overlays/default.nix)
     (final: prev: {
-      unstable = import self.inputs.nixpkgs-unstable { system = final.system; };
+      unstable = import inputs.nixpkgs-unstable { system = final.system; };
     })
   ];
 
@@ -106,8 +107,14 @@
     useGlobalPkgs = true;
     useUserPackages = true;
     sharedModules = [
-      self.inputs.nixvim.homeManagerModules.nixvim
+      inputs.nixvim.homeManagerModules.nixvim
+      {
+        home.stateVersion = config.system.stateVersion;
+      }
     ];
+    extraSpecialArgs = {
+      inherit inputs;
+    };
   };
 
   environment.systemPackages = with pkgs; [