create wallpaper dir if missing & fix home dir persistance

home/common/optional/desktop/wallpaper-changer/swww-wallpaper-changer/default.nix

@@ -13,10 +13,11 @@
       WantedBy = [ "default.target" ];
     };
     Service = {
-      Type = [ "oneshot" ];
+      Type = [ "simple" ];
       ExecStart = "${pkgs.writeShellScript "swww-wallpaper-changer" ''
         export WAYLAND_DISPLAY="wayland-1"
         wallpaper_dir="$HOME/.local/share/bg/"
+        [ -d "$wallpaper_dir" ] || mkdir -p "$wallpaper_dir"
 
         # Allow some time for desktop to start
         sleep 3

hosts/common/users/sam/default.nix

@@ -50,12 +50,9 @@ in
   '';
 
   environment.persistence."/persist" = {
-    hideMounts = true;
-    users.${username} = {
-        directories = [
-          "."
-        ];
-    };
+    directories = [
+      "/home/${username}"
+    ];
   };