Motorboy / Vatican Admin V1.4.4

UI refinement:
- left navigation stays scrollable with no visible scrollbar
- sidebar scroll position is preserved between page changes
- desktop sidebar can collapse/expand
- collapsed state persists across reloads
- mobile full-screen navigation behavior remains unchanged

Deployment:
1. Back up the current API directory.
2. Keep config.php, .htaccess, uploads/, storage/, and database unchanged.
3. Replace admin/ with the included admin/ folder.
4. Replace api.php to align version metadata.
5. Hard-refresh /admin/ once.
