Client Automatically Syncs New Files and Folders

### ⚠️ 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 have searched for 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

The client starts syncing new folders on itself and there does not seem to be a toggle to disable this behavior.

### Steps to reproduce

1. Choose folders to sync
2. Create new folder on the server
3. The client immediately starts syncing this folder.

### Expected behavior

Do not do that. When I choose which folders to sync, I deliberately do that.

### Which files are affected by this bug

?

### Operating system

Linux

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

Fedora Linux 44 KDE

### Installation method

Distro package manager

### Nextcloud Server version

Nextcloud Hub 26 Spring (34.0.3)

### Nextcloud Desktop Client version

34.0.2

### Did this occur after an update or on a clean installation?

I don't know.

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

No

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

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

### Additional info

The client apparently also did non bother about the toggle "Ask for confirmation before synchronizing new folders larger than: 500 MB (default)" and happily synced a new 11 GB folder on it's own.

Reproduce the issue using the listed folder-selection steps on the Nextcloud Desktop Client, including a newly created 11 GB server folder. No affected files or tests are identified, so first locate the folder-selection and new-folder confirmation behavior. Done means newly created folders do not sync unless selected and the configured confirmation threshold is respected.

Written by the indexing model from the issue text.