[BUG] Previously installed Homebrew packages are not shown when running via Distrobox

### Please confirm these before moving forward

- [x] I have searched for my issue and have not found a work-in-progress/duplicate/resolved issue.
- [x] I have tested that this issue has not been fixed in the latest [(beta or stable) release](https://github.com/Devolutions/UniGetUI/releases/).
- [x] I have checked the [FAQ](https://github.com/Devolutions/UniGetUI#frequently-asked-questions) section for solutions.
- [x] This issue is about a bug (if it is not, please use the [correct template](https://github.com/Devolutions/UniGetUI/issues/new/choose)).

### UniGetUI Version

2026.2.6

### Windows version, edition, and architecture

Bazzite Linux 44 (using Fedora 44 Distrobox container)

### Describe your issue

When running UniGetUI via a Distrobox container, previously installed Homebrew packages do not appear in the list of installed packages, even though installable Homebrew packages do appear in package discovery.

### Steps to reproduce the issue

1. Create a Distrobox container on Linux: `distrobox create --image registry.fedoraproject.org/fedora:latest --name fedora-box`
2. Enter the container: `distrobox enter fedora-box`
3. Install UniGetUI in the container: `sudo dnf install https://github.com/Devolutions/UniGetUI/releases/download/v2026.2.6/UniGetUI.linux-x64.rpm`
4. Install Homebrew in the container using its installer script
5. Export UniGetUI from the container: `distrobox export unigetui`
6. Run UniGetUI: `distrobox-enter -n fedora-box -- /opt/unigetui/UniGetUI -ozone-platform-hint=auto`
7. Enable Homebrew in UniGetUI if it's not already enabled
8. Refresh the installed package list
Expected result: Previously installed Homebrew packages appear in the list.
Actual result: Previously installed Homebrew packages don't appear.

### UniGetUI Log

```text
[UniGetUI Log.txt](https://github.com/user-attachments/files/30546879/UniGetUI.Log.txt)
```

### Package Managers Logs

```text
[UniGetUI Log - Packages.txt](https://github.com/user-attachments/files/30546882/UniGetUI.Log.-.Packages.txt)
```

### Relevant information

_No response_

### Screenshots and videos

_No response_

Start by reproducing the documented Distrobox and Homebrew steps, then inspect the attached UniGetUI and package-manager logs for the installed-package query. Done means refreshing UniGetUI in the exported container shows previously installed Homebrew packages while package discovery continues to work.

Written by the indexing model from the issue text.