[Bug]: E2E stuck on "Failed to upload encrypted file" after shutting down PC during E2E files sync

### ⚠️ Before submitting, please verify the following: ⚠️

- [x] This is a **bug**, not a question or a configuration issue.
- [x] This issue is **not** already reported on Github (I've searched it).
- [x] Nextcloud Server and Desktop Client are **up to date**. See [Server Maintenance and Release Schedule](https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule) and [Desktop Releases](https://nextcloud.com/install/#install-clients) for supported versions.
- [x] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/)

### Bug description

E2E encrypted sync worked fine as long as I let it finish before shutting down, but will get a "Failed to upload encrypted file" sync error after having shut it down during a large sync of photos and videos. I have freshly set up the Nextcloud instances (both AIO server & desktop), and it has happened twice now with completely fresh installs. Wiped the entire server install after the first occurence, but today it happened for the second time, and now I noticed it only happened after shutting down my PC while it was still syncing. I have **NOT** enabled server-side encryption here, just only the End-to-end Encryption app. I experienced this both on server 31 and 32.

### Steps to reproduce

1. Enable End-to-end encryption on both server & desktop
2. Create empty folder
3. Enable E2E on empty folder
4. Copy files from local disk to empty E2E folder
5. Let it sync multiple large photos/videos/files of max 50MB each, but have 100 of them.
6. Shutdown PC in the middle of E2E sync
7. Start PC
8. Upload should now fail

### Expected behavior

I would have expected the desktop client to deal with this more gracefully (let the in progress file finish and finish the sync, or finish the sync fully). And I would expect the desktop client to be auto-diagnosing/fixing the issue at hand.

### Which files are affected by this bug

Fotos/2018/REDACTED/DSC_0266.JPG

### Operating system

Windows

### Which version of the operating system you are running.

Windows 11

### Package

Official Windows MSI

### Nextcloud Server version

32.0.0 (currently), 31.0.9 (previously)

### Nextcloud Desktop Client version

3.17.3

### Is this bug present after an update or on a fresh install?

Fresh desktop client install

### Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

### Are you using an external user-backend?

- [x] Default internal user-backend
- [ ] LDAP/ Active Directory
- [ ] SSO - SAML
- [ ] Other

### Nextcloud Server logs

```shell
Can't find anything, logs from data/nextcloud.log are outdated from yesterday.
```

### Additional info

[desktop-log.md](https://github.com/user-attachments/files/22900298/desktop-log.md)