BizCore v4.0.3 Sidebar Navigation Hotfix

Changes:
- Adds separate Production & Manufacturing collapsible sidebar category.
- Adds Production Dashboard.
- Adds Recipes / BOM.
- Adds New Production.
- Adds Production Orders.
- Keeps the existing production.view permission gate.
- Existing header navigation and v4.0.2 permission variables are preserved.

Install:
1. Extract this ZIP into the BizCore project root.
2. Overwrite includes/header.php.
3. Refresh BizCore with Ctrl+F5.
