diff --git a/.copier-answers.yaml b/.copier-answers.yaml
index e576a6f..42e64e0 100644
--- a/.copier-answers.yaml
+++ b/.copier-answers.yaml
@@ -1,5 +1,5 @@
 # Changes here will be overwritten by Copier
-_commit: 05ef55a
+_commit: 41c2f2c
 _src_path: https://github.com/python-project-templates/base.git
 add_docs: true
 add_extension: rustjswasm
diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 1baefb3..f9af5da 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -110,18 +110,14 @@ jobs:
         CIBW_ENVIRONMENT_MACOS: MACOSX_DEPLOYMENT_TARGET=11.0
       if: matrix.os != 'ubuntu-latest'
 
-    - name: Test wheel install
-      run: |
-        python -m venv /tmp/test-wheel
-        /tmp/test-wheel/bin/pip install dist/*.whl
-        /tmp/test-wheel/bin/python -c "import python_template_rust"
+    - uses: actions-ext/python/test-wheel@main
+      with:
+        module: python_template_rust
       if: matrix.os == 'ubuntu-latest'
 
-    - name: Test sdist install
-      run: |
-        python -m venv /tmp/test-sdist
-        /tmp/test-sdist/bin/pip install dist/*.tar.gz
-        /tmp/test-sdist/bin/python -c "import python_template_rust"
+    - uses: actions-ext/python/test-sdist@main
+      with:
+        module: python_template_rust
       if: matrix.os == 'ubuntu-latest'
 
     - uses: actions/upload-artifact@v7
diff --git a/js/build.mjs b/js/build.mjs
index 59f7de8..ab8dcd1 100644
--- a/js/build.mjs
+++ b/js/build.mjs
@@ -1,9 +1,7 @@
 import { bundle } from "./tools/bundle.mjs";
 import { bundle_css } from "./tools/css.mjs";
 import { node_modules_external } from "./tools/externals.mjs";
-import { getarg } from "./tools/getarg.mjs";
 
-import { transform } from "lightningcss";
 import fs from "fs";
 import cpy from "cpy";
 
@@ -24,8 +22,6 @@ async function build() {
   await bundle_css();
 
   // Copy HTML
-  fs.mkdirSync("dist/html", { recursive: true });
-  cpy("src/html/*", "dist/html");
   cpy("src/html/*", "dist/");
 
   // Copy images
@@ -34,9 +30,11 @@ async function build() {
 
   await Promise.all(BUNDLES.map(bundle)).catch(() => process.exit(1));
 
-  // Copy from dist to python
+  // Copy servable assets to python extension (exclude esm/)
   fs.mkdirSync("../python_template_rust/extension", { recursive: true });
-  cpy("dist/**/*", "../python_template_rust/extension");
+  cpy("dist/**/*", "../python_template_rust/extension", {
+    filter: (file) => !file.relativePath.startsWith("esm"),
+  });
 }
 
 build();
diff --git a/js/tools/css.mjs b/js/tools/css.mjs
index 4ac3594..67aa219 100644
--- a/js/tools/css.mjs
+++ b/js/tools/css.mjs
@@ -35,8 +35,8 @@ const bundle_one = async (file, resolver) => {
     resolver: resolver || DEFAULT_RESOLVER,
   });
   const outName = path.basename(file);
-  fs.mkdirSync("./dist", { recursive: true });
-  fs.writeFileSync(path.join("./dist", outName), code);
+  fs.mkdirSync("./dist/css", { recursive: true });
+  fs.writeFileSync(path.join("./dist/css", outName), code);
 };
 
 export const bundle_css = async (root = "src/css/index.css", resolver = null) => {