Restore package-lock.json accidentally removed in #189 (#190)

The package-lock.json was inadvertently deleted in commit 3e5cc26
(PR #189), causing CI workflows (static.yml, merge.yml) to fail
since they depend on `npm ci` which requires this file.

This restores the file from the commit immediately prior (b4838e8).

Made-with: Cursor

Co-authored-by: Aravind . <aravind@backbase.com>

Author: aravind1801-p