feat(gaming): generic umu game installer, skill, and desktop entries (#411)

home/linux/gui/base/gaming.nix

@@ -1,6 +1,5 @@
 {
   pkgs,
-  osConfig,
   config,
   lib,
   ...
@@ -12,7 +11,7 @@ in
 {
   options.modules.desktop = {
     gaming = {
-      enable = mkEnableOption "Install Game Suite(steam, lutris, etc)";
+      enable = mkEnableOption "Enable desktop gaming support";
     };
   };
 
@@ -20,19 +19,19 @@ in
     # ==========================================================================
     # Other Optimizations
     # Usage:
-    #  Lutris - enable advanced options, go to the System options -> Command prefix, add: `mangohud`
-    #  Steam  - add this as a launch option: `mangohud %command%` / `gamemoderun %command%`
+    #  UMU game launchers use MangoHud by default; set ENABLE_MANGOHUD=0 in their conf to disable.
+    #  Steam - add this as a launch option: `mangohud %command%` / `gamemoderun %command%`
     # ==========================================================================
 
+    # The nix-config-umu-game skill and the launchers it generates rely on
+    # umu-launcher, mangohud, winetricks and bbe from this list.
+
     home.packages =
       (with pkgs; [
         # https://github.com/flightlessmango/MangoHud
         # a simple overlay program for monitoring FPS, temperature, CPU and GPU load, and more.
         mangohud
 
-        # GUI for installing custom Proton versions like GE_Proton
-        # proton - a Wine distribution aimed at gaming
-        protonplus
         # Script to install various redistributable runtime libraries in Wine.
         winetricks
         # https://github.com/Open-Wine-Components/umu-launcher
@@ -53,25 +52,5 @@ in
         })
       ]);
 
-    # Game launchers for Epic/GOG/Ubisoft/etc. (use Steam + DWProton for common games)
-
-    # a GUI game launcher for Steam/GoG/Epic/Ubisoft
-    # https://lutris.net/games?ordering=-popularity
-    programs.lutris = {
-      enable = true;
-      defaultWinePackage = pkgs.proton-ge-bin;
-      steamPackage = osConfig.programs.steam.package;
-      protonPackages = [ pkgs.proton-ge-bin ];
-      winePackages = with pkgs; [
-        wineWow64Packages.full
-      ];
-      extraPackages = with pkgs; [
-        winetricks
-        gamescope
-        gamemode
-        mangohud
-        umu-launcher
-      ];
-    };
   };
 }

home/linux/gui/niri/conf/windowrules.kdl

@@ -56,25 +56,41 @@ window-rule {
 
 // Entertainment applications - open in workspace 4
 window-rule {
-    match app-id="steam"
+    // niri matches app-id anywhere in the string, so a bare "steam" would also
+    // catch the `steam_app_<GAMEID>` game windows below and hand them
+    // `open-maximized`, which fights their fullscreen rule. Anchor it so this
+    // only affects the Steam client window itself.
+    match app-id="^steam$"
     open-on-workspace "4entertainment"
+    open-maximized true
 }
 window-rule {
     match app-id="steam_app_default"
     open-on-workspace "4entertainment"
 }
+window-rule {
+    // Games launched through umu/Proton -- including the launchers the
+    // nix-config-umu-game skill generates -- report `steam_app_<GAMEID>`.
+    // Without a rule Niri tiles them at the default 50% column width, and a
+    // DXGI "fullscreen" window larger than the output (a 4K panel here runs at
+    // scale 1.5, so Niri's logical space is 2560x1440) cannot take over the
+    // screen by itself.
+    //
+    // The launcher shares this app id with the game, so the rule also catches
+    // its own windows: a helper that is still untitled while it maps, and the
+    // announcement popup (公告), which on this launcher renders as a pure white
+    // rectangle. Fullscreening either one buries the UI that opened it, so
+    // both are excluded here.
+    match app-id="^steam_app_[0-9]+$"
+    exclude title="^$"
+    exclude title="^(公告|Announcement|Notice)$"
+    open-on-workspace "4entertainment"
+    open-fullscreen true
+}
 window-rule {
     match app-id="heroic"
     open-on-workspace "4entertainment"
 }
-window-rule {
-    match app-id="net.lutris.Lutris"
-    open-on-workspace "4entertainment"
-}
-window-rule {
-    match app-id="com.vysp3r.ProtonPlus"
-    open-on-workspace "4entertainment"
-}
 window-rule {
     // Run anime games on Linux
     match app-id="^moe.launcher"