fix: allow npm install to succeed when node binary was previously extracted

The adm-zip extractEntryTo call in downloadNodeBinary.js did not pass
the overwrite flag, causing postinstall to fail with "Target file already
exists" on repeat runs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: abose

src-build/downloadNodeBinary.js

@@ -187,7 +187,7 @@ function unzipFile(zipFilePath, extractPath) {
         }
 
         if (!zipEntry.isDirectory) {
-            zip.extractEntryTo(zipEntry.entryName, extractPath);
+            zip.extractEntryTo(zipEntry.entryName, extractPath, /*maintainEntryPath*/true, /*overwrite*/true);
         }
     });