Spotlight Support (NSFileProviderSearching)

### ⚠️ 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

Spotlight search, and also third party search tools like Find Any File, is not working as expected on macOS version Tahoe 26.2 with Nextcloud VFS Client version 4.0.5. Search results only include items that have been discovered (by opening the parent folder) or fully synchronized. Undiscovered items are not searchable.

### Steps to reproduce

1. install neweset version of nextcloud vfs on newest version on macOS and set it up.
2. fully synced.
3. searching via spotlight for a file
4. no results

### Expected behavior

Files should show up in Spotlight search.

### Which files are affected by this bug

All files that are not downloaded, opened or seen.

### Operating system

macOS

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

Tahoe 26.2

### Package

Official macOS Virtual files 12+ universal pkg

### Nextcloud Server version

32.0.3

### Nextcloud Desktop Client version

4.0.5

### 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

Files can be found if the relevant folder has been clicked on beforehand and the contents of the folder have been viewed.