Don't auto-generate .desktop file (Linux, AppImage)

Problem Description

I've noticed that the AppImage generates it's own .desktop file ??
I am not sure but when I use GearLever (a popular AppImage manager for Linux), I end up having two launchers. The one with the slightly worse resolution seems to be the one managed by SimpMusic.

Linux users usually have their own way of managing AppImages (or a 'standard' such as GearLever), and AppImages aren't usually expected to handle that functionality themselves.

Proposed Solution

Remove the functionality

Alternative Solutions

1. Programs that do manage their own desktop integration usually do it with an install/uninstall script, so that could be a reasonable compromise if you wanted the app to be more self-sufficient.

2. That could also mean having a popup on first startup, asking you whether you want to integrate the app to your desktop. That way you could reuse the previous code and let the user decide. I think Jetbrains Toolbox did it like that too

Additional Context

No response

The issue does not name a file or test. Start by locating the AppImage packaging and desktop-integration entry point, then check how the .desktop file is generated. Done means the AppImage no longer auto-generates that file and existing Linux packaging checks still pass.