[Bug]: QR Sync - Sync with Imported account throws error

@grvgoel81 is already working on this.

Since Jul 29, 2026.

### Describe the bug

Sync with Imported account throws error.

### Expected behavior

I'm unsure if that is supported, but if it's not, then we may want to remove the Imported Accounts from the list of sync.

### Screenshots/Recordings

Extension:

https://github.com/user-attachments/assets/fc6eb938-378d-41fe-be05-95aca4bf454d

Phone:

https://github.com/user-attachments/assets/2cc1545c-c6b0-4905-b762-06f9bd0d0b7c

### Steps to reproduce

1. Enable QR sync in both extension and mobile
2. In extension, Add a new account using PRivate Key
3. Now open the QR scan sync from settings
4. On Mobile, go through onboarding and scan the QR code
5. See account list with Wallet 1 (SRP account list ) and Imported account (with private key)
6. Select Imported account with private key (already selected)
7. Confirm
8. See error on both sides

### Error messages or log output

```shell

```

### Where was this bug found?

Internal release testing

### Version

main (unsure when this is going to be released)

### Build type

None

### Browser

Chrome

### Operating system

MacOS

### Hardware wallet

_No response_

### Additional context

_No response_

### Severity

_No response_