Document per-app environment overrides via a user-level XDG desktop file (Common Tweaks)

[CJHarmath]

Ran into a case (NVIDIA driver forced session-wide via default/hypr/nvidia.lua, but one specific app needed X11/Mesa instead) where the fix was a completely standard XDG mechanism, not anything Omarchy-specific: dropping a same-named .desktop file in ~/.local/share/applications/ that overrides the package-installed one in /usr/share/applications/ (user data dir takes precedence in the XDG desktop-file lookup order), with an Exec= line wrapping the real binary in env VAR=value ... /path/to/real/binary %f.

Concrete example that worked:

[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
Name=Citrix Receiver Engine
StartupWMClass=Wfica
NoDisplay=true
MimeType=application/x-ica;
Icon=/opt/Citrix/ICAClient/icons/manager.png
TryExec=/opt/Citrix/ICAClient/wfica.sh
Exec=env -u WAYLAND_DISPLAY XDG_SESSION_TYPE=x11 GDK_BACKEND=x11 QT_QPA_PLATFORM=xcb EGL_PLATFORM=x11 /opt/Citrix/ICAClient/wfica.sh %f

followed by update-desktop-database ~/.local/share/applications. Survives package updates since it never touches the package-owned file. Full case study: https://gist.github.com/CJHarmath/53ee5cdc6c02e4467ec051cfac9b1bb9

This isn't specific to GPU vendor forcing — it's the general answer to "how do I override an env var for just one installed app, without touching its package or my whole session's environment" — a question that'll come up for plenty of things beyond NVIDIA (locale, Qt/GTK theme quirks, toolkit backend selection, etc.).

Suggestion: add a short entry to Common Tweaks documenting this pattern generically, since it currently isn'''t mentioned anywhere in the manual and it'''s the correct XDG-native answer rather than editing Hyprland'''s session-wide env config for an app-specific problem.