[Bug]: Read-only folder on server is not shown as read-only on Windows

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- [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.
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### Bug description

If a folder on server side is marked as read-only, e.g. due to external share or resharing, then the synced folder is not marked as read-only (due to limitation of QT5), but only all files in this folder are read-only.

This leads to Windows creating temp files when opening a read-only Word document in the same folder, which then are (correctly) not synced.

### Steps to reproduce

1. mount an external storage with read-only
2. sync this folder to Windows
3. open a MS Word document from this folder
4. MS Word will create a temp copy as it cannot edit the original one
5. this copy is not being synced (correct), but kept all the time there (and shows an error)

### Expected behavior

Folder should be read-only, so that Windows will not create a temp file in it.

### Which files are affected by this bug

folder

### Operating system

Windows

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

Windows 10

### Package

Distro package manager

### Nextcloud Server version

25

### Nextcloud Desktop Client version

3.10.0

### 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?

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

### Nextcloud Server logs

_No response_

### Additional info

_No response_