[Bug]: Can't open configuration window

### ⚠️ 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

When Nextcloud Desktop start (on startup or manually) it gets reduced to the system tray, and I can't open the window. The client is running and my files are synchronized, but I would like to add another account and I can't open the configuration window to do it.

When I place my cursor on the Nextcloud icon of the system tray, the window preview is transparent.

I can however open the general configuration window (french version)

### Steps to reproduce

Install the Nextcloud client, configure an account, and try to open the Nextcloud Desktop configuration menu to add another one.
The window does not open.

### Expected behavior

The file/sync configuration window should open

(this is a screenshot of the window I can't open, taken from the last release video)

### Which files are affected by this bug

none

### Operating system

Windows

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

Windows 10

### Package

Official Windows MSI

### Nextcloud Server version

32.0.6

### Nextcloud Desktop Client version

33.0.0 (but also in v4.0.6)

### 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

```

### Additional info

client logs (redacted)
[20260217_1759_nextcloud.log.0.txt](https://github.com/user-attachments/files/26517869/20260217_1759_nextcloud.log.0.txt)

Here is the only warning that I found suspect.
```
2026-02-17 17:59:35:906 [ warning default unknown:0 ]: Failed to create D3D11 swapchain: COM error 0x80070057: Param�tre incorrect. (Width=448 Height=571 Format=28 SampleCount=1 BufferCount=2 Scaling=0 SwapEffect=4 Stereo=0)
2026-02-17 17:59:35:906 [ warning default unknown:0 ]: Failed to create swapchain. Retrying by requesting a software rasterizer, if applicable for the 3D API implementation.
```

buildinfo
```
Nextcloud Desktop Client Version 33.0.0 (Windows running on windows)

Utilise l'extension de fichiers virtuels : wincfapi

windows-6.2.9200

Nextcloud Desktop Client Version 33.0.0 (Windows running on windows)

Cette version a été fournie par Nextcloud GmbH.

Généré à partir de la révision Git 659bb5 du Mar 23 2026, 16:45:42 en utilisant Qt 6.10.2, OpenSSL 3.5.5 27 Jan 2026

```

Window Update says everything is up to date too (I first suspected an issue with graphic drivers).