chore: Ignore manual-test.js

Adds manual-test.js to .gitignore to prevent it from being
tracked. This file is typically used for local manual testing
and may contain sensitive data or configurations not intended
for the repository.

Author: catsika

.gitignore

@@ -27,3 +27,6 @@ Thumbs.db
 
 # Test coverage
 coverage/
+
+# Manual test files
+manual-test.js