build-backend: Allow overriding module names for editable builds (#12137)

## Summary

This PR enables module name overrides for editable installs. 

Builds upon #11884. The
`tool.uv.build-backend.module-name` option is now respected during
editable build processes.

## Test Plan

Added a test.

---------

Co-authored-by: Charlie Marsh <[email protected]>

Author: blueraft

crates/uv-build-backend/src/wheel.rs

@@ -282,7 +282,17 @@ pub fn build_editable(
         return Err(Error::AbsoluteModuleRoot(settings.module_root.clone()));
     }
     let src_root = source_tree.join(settings.module_root);
-    let module_root = src_root.join(pyproject_toml.name().as_dist_info_name().as_ref());
+
+    let module_name = if let Some(module_name) = settings.module_name {
+        module_name
+    } else {
+        // Should never error, the rules for package names (in dist-info formatting) are stricter
+        // than those for identifiers
+        Identifier::from_str(pyproject_toml.name().as_dist_info_name().as_ref())?
+    };
+    debug!("Module name: `{:?}`", module_name);
+
+    let module_root = src_root.join(module_name.as_ref());
     if !module_root.join("__init__.py").is_file() {
         return Err(Error::MissingModule(module_root));
     }

crates/uv/tests/it/build_backend.rs

@@ -368,3 +368,66 @@ fn rename_module() -> Result<()> {
 
     Ok(())
 }
+
+/// Test `tool.uv.build-backend.module-name` for editable builds.
+#[test]
+fn rename_module_editable_build() -> Result<()> {
+    let context = TestContext::new("3.12");
+    let temp_dir = TempDir::new()?;
+
+    context
+        .temp_dir
+        .child("pyproject.toml")
+        .write_str(indoc! {r#"
+        [project]
+        name = "foo"
+        version = "1.0.0"
+
+        [tool.uv.build-backend]
+        module-name = "bar"
+
+        [build-system]
+        requires = ["uv_build>=0.5,<0.7"]
+        build-backend = "uv_build"
+    "#})?;
+
+    context
+        .temp_dir
+        .child("src/bar/__init__.py")
+        .write_str(r#"print("Hi from bar")"#)?;
+
+    uv_snapshot!(context
+        .build_backend()
+        .arg("build-editable")
+        .arg(temp_dir.path())
+        .env("UV_PREVIEW", "1"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    foo-1.0.0-py3-none-any.whl
+
+    ----- stderr -----
+    "###);
+
+    context
+        .pip_install()
+        .arg(temp_dir.path().join("foo-1.0.0-py3-none-any.whl"))
+        .assert()
+        .success();
+
+    // Importing the module with the `module-name` name succeeds.
+    uv_snapshot!(Command::new(context.interpreter())
+        .arg("-c")
+        .arg("import bar")
+        // Python on windows
+        .env(EnvVars::PYTHONUTF8, "1"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    Hi from bar
+
+    ----- stderr -----
+    "###);
+
+    Ok(())
+}