python3Packages.furo: Fix build on platforms without nodejs (#473963)

pkgs/development/python-modules/furo/default.nix

@@ -1,19 +1,38 @@
 {
+  stdenv,
   lib,
+  nodejs,
   buildNpmPackage,
   buildPythonPackage,
+  runCommand,
   fetchFromGitHub,
+  fetchPypi,
   flit-core,
   accessible-pygments,
   beautifulsoup4,
   pygments,
   sphinx,
   sphinx-basic-ng,
+  unzip,
 }:
 
 let
   pname = "furo";
   version = "2025.07.19";
+  # version on pypi doesn't have month & day padded with 0
+  pypiVersion =
+    let
+      versionComponents = lib.strings.splitString "." version;
+      dropLeadingZero = lib.strings.removePrefix "0";
+    in
+    # year
+    (lib.lists.elemAt versionComponents 0)
+    + "."
+    # month
+    + (dropLeadingZero (lib.lists.elemAt versionComponents 1))
+    + "."
+    # day
+    + (dropLeadingZero (lib.lists.elemAt versionComponents 2));
 
   src = fetchFromGitHub {
     owner = "pradyunsg";
@@ -22,7 +41,28 @@ let
     hash = "sha256-pIF5zrh5YbkuSkrateEB/tDULSNbeVn2Qx+Fm3nOYGE=";
   };
 
-  web = buildNpmPackage {
+  web-bin =
+    let
+      web-bin-src = fetchPypi {
+        inherit pname;
+        version = pypiVersion;
+        format = "wheel";
+        dist = "py3";
+        python = "py3";
+        hash = "sha256-veqGmCLf0rSU6oTAlzk3410Vda8Ii2chopx/eHityeM=";
+      };
+    in
+    runCommand "${pname}-web-bin"
+      {
+        nativeBuildInputs = [ unzip ];
+      }
+      ''
+        mkdir $out
+        unzip ${web-bin-src}
+        cp -rv furo/theme/furo/static/{scripts,styles} $out/
+      '';
+
+  web-native = buildNpmPackage {
     pname = "${pname}-web";
     inherit version src;
 
@@ -35,6 +75,8 @@ let
       popd
     '';
   };
+
+  web = if (lib.meta.availableOn stdenv.buildPlatform nodejs) then web-native else web-bin;
 in
 
 buildPythonPackage rec {