hold overlays correctly

configs/applicative.nix

@@ -20,39 +20,9 @@
 
   nixpkgs.overlays = [
     (final: prev: {
-      niphas-wallpaper =
-        let
-          backgroundColor = config.lib.stylix.colors.withHashtag.base06;
-          foregroundColor = config.lib.stylix.colors.withHashtag.base01;
-          width = 1920;
-          height = 1080;
-
-          svgUrl = "https://applicative.systems/_astro/logo-full.D8zRvqBZ.svg";
-          logoSvg = prev.fetchurl {
-            url = svgUrl;
-            hash = "sha256-qXDIEZsAPn4eUJ3kb5U6L3PMUCtWGYqhqyIaBt7FntE=";
-          };
-        in
-        prev.runCommand "applicative-wallpaper.png"
-          {
-            nativeBuildInputs = [ prev.imagemagick ];
-          }
-          ''
-            # 1. We use -background to set the canvas color
-            # 2. We use -fuzz and -opaque to replace the logo's internal colors
-            # 3. We use -gravity and -extent to center it on a wallpaper-sized canvas
-
-            convert \
-              -background none \
-              -density 300 \
-              "${logoSvg}" \
-              -fuzz 100% -fill "${foregroundColor}" -opaque black \
-              -resize 800x800 \
-              -gravity center \
-              -background "${backgroundColor}" \
-              -extent ${toString width}x${toString height} \
-              $out
-          '';
+      niphas-wallpaper = prev.callPackage ../packages/applicative-wallpaper.nix {
+        inherit (config.lib.stylix) colors;
+      };
     })
   ];