fix: load user data for editing Invoice and TemporaryInvoice panels

- Loaded user lock information to enhance usability in Invoice and TemporaryInvoice panels.
- Ensured more meaningful user data for lock notification messages.
- Renamed functions and aligned code for better readability.
- Refined dependency loading in unlock panel function to increase stability.
- Added 'Users' dependency for user information retrieval.

Related: pcsg/buero#488