[BWA-195] Auth does not update username field when Bitwarden updated

### Steps To Reproduce

1. Have Auth syncing with Bitwarden
2. Change the Username field on a Bitwarden entry that sync's the TOTP token to Auth
3. Save the entry. Sync Bitwarden
4. Open Auth
5. Search for the site
6. Username has not been updated

### Expected Result

I expect the username field in Auth from a synced Bitwarden session to get updated.

### Actual Result

Auth continues to use old, prior username as a field.
Due to it being a synced item, it can't be edited to be corrected either.

### Screenshots or Videos

_No response_

### Additional Context

_No response_

### Build Version

2025.9.0

### What server are you connecting to?

US

### Self-host Server Version

_No response_

### Environment Details

Pixel 7a up to date Android

### Issue Tracking Info

- [x] I understand that work is tracked outside of Github. A PR will be linked to this issue should one be opened to address it, but Bitwarden doesn't use fields like "assigned", "milestone", or "project" to track progress.