add xwayland-satellite service, override steam.desktop with DISPLAY=:0

config/applications/steam.desktop

@@ -0,0 +1,48 @@
+[Desktop Entry]
+Name=Steam
+Comment=Application for managing and playing games on Steam
+Exec=env DISPLAY=:0 steam %U
+Icon=steam
+Terminal=false
+Type=Application
+Categories=Network;FileTransfer;Game;
+MimeType=x-scheme-handler/steam;x-scheme-handler/steamlink;
+Actions=Store;Community;Library;Servers;Screenshots;News;Settings;BigPicture;Friends;
+PrefersNonDefaultGPU=true
+X-KDE-RunOnDiscreteGpu=true
+
+[Desktop Action Store]
+Name=Store
+Exec=env DISPLAY=:0 steam steam://store
+
+[Desktop Action Community]
+Name=Community
+Exec=env DISPLAY=:0 steam steam://url/CommunityHome/
+
+[Desktop Action Library]
+Name=Library
+Exec=env DISPLAY=:0 steam steam://open/games
+
+[Desktop Action Servers]
+Name=Servers
+Exec=env DISPLAY=:0 steam steam://open/servers
+
+[Desktop Action Screenshots]
+Name=Screenshots
+Exec=env DISPLAY=:0 steam steam://open/screenshots
+
+[Desktop Action News]
+Name=News
+Exec=env DISPLAY=:0 steam steam://openurl/https://store.steampowered.com/news
+
+[Desktop Action Settings]
+Name=Settings
+Exec=env DISPLAY=:0 steam steam://open/settings
+
+[Desktop Action BigPicture]
+Name=Big Picture
+Exec=env DISPLAY=:0 steam steam://open/bigpicture
+
+[Desktop Action Friends]
+Name=Friends
+Exec=env DISPLAY=:0 steam steam://open/friends

niri.nix

@@ -22,6 +22,20 @@
   xdg.dataFile."applications/switch-wallpaper.desktop".source = ./config/applications/switch-wallpaper.desktop;
   xdg.dataFile."applications/signal.desktop".source = ./config/applications/signal.desktop;
   xdg.dataFile."applications/vesktop.desktop".source = ./config/applications/vesktop.desktop;
+  xdg.dataFile."applications/steam.desktop".source = ./config/applications/steam.desktop;
+
+  systemd.user.services.xwayland-satellite = {
+    Unit = {
+      Description = "Xwayland for niri";
+      BindsTo = [ "graphical-session.target" ];
+      After = [ "graphical-session.target" ];
+    };
+    Service = {
+      ExecStart = "${pkgs.xwayland-satellite}/bin/xwayland-satellite";
+      Restart = "on-failure";
+    };
+    Install.WantedBy = [ "graphical-session.target" ];
+  };
 
   services.mako = {
     enable = true;