fix(cli): dynamically scan root .d.ts files from @vitest/browser (#944)

## Summary

- Replace hardcoded list of root `.d.ts` files with dynamic `readdir`
scan for `@vitest/browser` package
- This ensures newly added type definition files (like `aria-role.d.ts`,
`utils.d.ts`) are automatically included without requiring manual
updates to the build script

related #909 in the TODO.

## Test ways
- Run `node --import @oxc-node/core/register ./build.ts` in
`packages/test` and verify only `@vitest/browser` root `.d.ts` files are
copied (aria-role.d.ts, context.d.ts, jest-dom.d.ts, matchers.d.ts,
utils.d.ts)
- Verify `vp pack` succeeds in a library project that imports
`UserConfig` from `vite-plus`

Co-authored-by: MK (fengmk2) <fengmk2@gmail.com>

Author: kazupon

packages/test/build.ts

@@ -619,21 +619,23 @@ async function copyVitestPackages() {
     totalCopied += copied;
     console.log(`    -> ${copied} files`);
 
-    // Copy root type definition files if they exist
-    // These include context.d.ts (browser providers), matchers.d.ts (expect.element),
-    // jest-dom.d.ts (matchers), aria-role.d.ts (ARIARole type used by context.d.ts)
-    // TODO: consider dynamically scanning root .d.ts files instead of hardcoding,
-    // since upstream @vitest/browser may add new .d.ts files in future versions.
-    const rootDtsFiles = ['context.d.ts', 'matchers.d.ts', 'jest-dom.d.ts', 'aria-role.d.ts'];
-    for (const dtsFile of rootDtsFiles) {
-      const rootDts = resolve(projectDir, `node_modules/${pkg}/${dtsFile}`);
+    // Copy root .d.ts files from @vitest/browser package directory.
+    // These are type definitions that live at the package root (not in dist/),
+    // e.g. context.d.ts, matchers.d.ts, aria-role.d.ts, utils.d.ts.
+    // Dynamically scan instead of hardcoding to handle future upstream additions.
+    if (pkg === '@vitest/browser') {
+      const pkgRoot = resolve(projectDir, `node_modules/${pkg}`);
       try {
-        await stat(rootDts);
-        await copyFile(rootDts, join(destPkgDir, dtsFile));
-        console.log(`    + copied ${dtsFile}`);
-        totalCopied++;
+        const pkgEntries = await readdir(pkgRoot);
+        for (const entry of pkgEntries) {
+          if (entry.endsWith('.d.ts')) {
+            await copyFile(join(pkgRoot, entry), join(destPkgDir, entry));
+            console.log(`    + copied ${entry}`);
+            totalCopied++;
+          }
+        }
       } catch {
-        // File doesn't exist, skip
+        // Package root not readable, skip
       }
     }
   }