After changing the structure of my bookmark folders, cannot sync due to "E002: Bookmark to update doesn't exist anymore"

### Which version of floccus are you using?

5.6.0

### How many bookmarks do you have, roughly?

about 100-200

### Are you using other means to sync bookmarks in parallel to floccus?

No

### Sync method

Google Drive

### Which browser are you using? In case you are using the phone App, specify the Android or iOS version and device please.

Dia Browser 1.0.2

### Which version of Nextcloud Bookmarks are you using? (if relevant)

_No response_

### Which version of Nextcloud? (if relevant)

_No response_

### What kind of WebDAV server are you using? (if relevant)

_No response_

### Describe the Bug

I was using bookmark management to change the folder structure and moves things around with my bookmarks, and I found the error in floccuss addon

log as follow

[floccus-5.6.0-2025-10-13-full.log](https://github.com/user-attachments/files/22879955/floccus-5.6.0-2025-10-13-full.log)

### Expected Behavior

it used to periodically sync, suddenly it stops with a weird error

### To Reproduce

### Debug log provided

- [x] I have provided a debug log file