PreviewText: extraneous file actions shown

### ⚠️ Before posting ⚠️

- [X] This is a **bug**, not a question or an enhancement.
- [X] I've [searched for similar issues](https://github.com/nextcloud/android/issues) and didn't find a duplicate.
- [X] I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
- [X] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/).

### Steps to reproduce

1. set up nextcloud app with account
2. create empty `file.txt` in root directory
3. download file via three dots menu
4. open file (local editor)
5. open three dots menu located on top right-hand corner

### Expected behaviour

Options menu with appropriate actions appears.

### Actual behaviour

Some extraneous options appear, which do not perform any actions, when pressed: *Export*, *Deselect all*, *Pin to Home screen*.

When selecting *Details* and navigating back afterwards, the main action bar (searchbar) is displayed.

### Android version

13

### Device brand and model

OnePlus 6T

### Stock or custom OS?

Custom (explain in "additional information")

### Nextcloud android app version

849799c

### Nextcloud server version

26.0.1

### Using a reverse proxy?

No

### Android logs

_No response_

### Server error logs

_No response_

### Additional information

Custom OS: LineageOS 20.0

Beginne damit, den beschriebenen PreviewText-Ablauf nachzuvollziehen: Öffne lokal eine leere Datei und überprüfe das Drei-Punkte-Menü oben rechts; prüfe anschließend die Details-and-back-Navigation. Die Aufgabe ist erledigt, wenn nur anwendbare Aktionen angezeigt werden, jede aufgeführte Aktion funktioniert und die Rückkehr aus Details die richtige Aktionsleiste wiederherstellt.

Vom Indexierungsmodell aus dem Issue-Text verfasst.