Implement automatic authentication based on computer name to enable
passwordless login for registered computers with fallback to manual
authentication.
Changes:
- Add SessionManager.login_by_computer_name() for silent login attempt
- Add BIPUsersDAO.authenticate_by_computer_name() for computer name lookup
- Update BIPUsersDAO.create_user() to support optional computer_name parameter
- Update main_ui.py to try silent login before showing login dialog
- Display current computer name in login dialog for user reference
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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