Missing WM_CLASS for X11/Wayland

[drpsyko101]

Describe the bug
The current Blender Launcher doesn't have any wm_class string defined. This is important for Xorg/Wayland desktop manager to identify and handle multiple instances of the app. Missing wm_class also causes the app icon/name to be set to the default desktop manager icon/name.

To Reproduce
Steps to reproduce the behavior:

1. Launch Blender Launcher.
2. Check for the WM_CLASS value:
   a. For X11, use xprop and click on the Blender Launcher
   b. For Wayland, use Looking Glass (lg) to probe the wmclass value
3. It will return either null or empty string.

Expected behavior
The wm_class should have a unique, identifiable value.

System (please complete the following information):

• Operation system: Fedora Workstation 41
• Blender Launcher version: 2.3.2

[zeptofine]

I've managed to set WM_CLASS on X11 using an application argument, but I'm stuck on setting it for Wayland. If you run the program with the env variable QT_QPA_PLATFORM=xcb anytime after commit 0983aa1 it should set the class to blender-launcher-v2

Leaving this open incase I discover a method for setting it in Wayland