[Bug]: .whiteboard cannot be opened via right-click on file > Nextcloud > open in browser

### ⚠️ 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/)

### Steps to reproduce

- create whiteboard in web
- open same folder on desktop
- right click on that .whiteboard file > Nextcloud > open in browser
- this url gets opened: https://cloud.nextcloud.com/apps/files/directEditing/aZZxtZjK7Wbt4xsEextPKyt9k4DyZmTGZArSfbC6jRqn2g[redacted]
- see a blank page with text "{"elements":[],"files":[]}" (see attached)

### Expected behavior

whiteboard opens in browser

### Which files are affected by this bug

.whiteboard

### Operating system

Linux

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

Linux Mint 22.1

### Package

Official Linux AppImage

### Nextcloud Server version

31.0.7

### Nextcloud Desktop Client version

3.16.6daily

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

Updated from a minor version (ex. 3.4.2 to 3.4.4)

### 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

```shell

```

### Additional info

comment from Engineer: whiteboard does not handle the RegisterDirectEditorEvent - so I suspect it does not support direct editing yet.