Display Alias for Privilege Credentials in Shared Device Settings

When a device is configured with only a Privilege password and no Privilege Username, the Privilege Username field in Shared Device Settings displays as empty, giving users no visual confirmation of which credential alias is currently selected. This enhancement would display the associated Alias in the Privilege Username field whenever no explicit username is configured, so the selected credential set remains visible. Customers troubleshooting device connectivity would gain clarity on which credentials are active without needing to modify shared settings that could affect other devices using the same profile.