refactor(spawn): tighten powershell rewrite review points

- Compare `.bin` / `node_modules` path components case-insensitively,
  matching the existing case-insensitive `.cmd`/`.bat` check and npm's
  de-facto lowercase naming (robust to symlinks/mounts)
- Condense the scope-check comment to one line to match the repo style
- Narrow `#[expect(clippy::disallowed_types)]` from the whole test
  module to just the two helpers that actually bridge std paths

Author: fengmk2

crates/vite_task/src/session/execute/powershell.rs

@@ -65,16 +65,13 @@ fn rewrite_with_host(
         return None;
     }
 
-    // Only rewrite shims under `node_modules/.bin` — the triplet
-    // (`.cmd` / `.ps1` / POSIX) is a known-safe shape produced by npm /
-    // pnpm / yarn. Any other `.cmd` / `.bat` on PATH (Windows system tools,
-    // user-installed tools) is left alone to avoid unintended side effects.
+    // Limit to npm/pnpm/yarn `node_modules/.bin` shims; leave system tools alone.
     let mut parents = program_path.as_path().components().rev();
     parents.next()?; // shim filename
-    if parents.next()?.as_os_str() != ".bin" {
+    if !parents.next()?.as_os_str().eq_ignore_ascii_case(".bin") {
         return None;
     }
-    if parents.next()?.as_os_str() != "node_modules" {
+    if !parents.next()?.as_os_str().eq_ignore_ascii_case("node_modules") {
         return None;
     }
 
@@ -104,28 +101,22 @@ fn rewrite_with_host(
 }
 
 #[cfg(test)]
-#[expect(
-    clippy::disallowed_types,
-    reason = "test fixtures bridge tempdir's std paths into AbsolutePath"
-)]
 mod tests {
-    use std::{
-        fs,
-        path::{Path, PathBuf},
-        sync::Arc,
-    };
+    use std::{fs, sync::Arc};
 
     use tempfile::tempdir;
     use vite_path::{AbsolutePath, AbsolutePathBuf};
     use vite_str::Str;
 
     use super::rewrite_with_host;
 
-    fn abs_path(buf: PathBuf) -> Arc<AbsolutePath> {
+    #[expect(clippy::disallowed_types, reason = "tempdir bridges std PathBuf into AbsolutePath")]
+    fn abs_path(buf: std::path::PathBuf) -> Arc<AbsolutePath> {
         Arc::<AbsolutePath>::from(AbsolutePathBuf::new(buf).unwrap())
     }
 
-    fn bin_dir(root: &Path) -> PathBuf {
+    #[expect(clippy::disallowed_types, reason = "tempdir hands out std Path for the test root")]
+    fn bin_dir(root: &std::path::Path) -> std::path::PathBuf {
         let bin = root.join("node_modules").join(".bin");
         fs::create_dir_all(&bin).unwrap();
         bin