refactor(nix): use baseline x86 desktop packages

common/optional/printing.nix

@@ -2,7 +2,7 @@
 {
   services.printing = {
     enable = true;
-    drivers = with pkgs; [
+    drivers = with pkgs.x86-v1; [
       gutenprint
       hplip
     ];

common/optional/steam.nix

@@ -1,6 +1,6 @@
 { pkgs, ... }:
 {
-  environment.systemPackages = with pkgs; [
+  environment.systemPackages = with pkgs.x86-v1; [
     mangohud
     steam-run
   ];
@@ -10,6 +10,7 @@
     gamemode.enable = true;
     steam = {
       enable = true;
+      package = pkgs.x86-v1.steam;
       gamescopeSession.enable = true;
       remotePlay.openFirewall = true;
       localNetworkGameTransfers.openFirewall = true;

overlays/default.nix

@@ -22,6 +22,10 @@
       system = final.stdenv.hostPlatform.system;
       config.allowUnfree = true;
     };
+
+    # Keep the complete KDE/Qt package scope on the same baseline architecture
+    # so large packages such as Qt WebEngine can use the upstream binary cache.
+    kdePackages = final.x86-v1.kdePackages;
   };
 
   patches = import ./patches;

users/richie/home/gui/default.nix

@@ -15,16 +15,16 @@
     mediainfo
     obs-studio
     x86-v1.obsidian
-    prismlauncher
+    x86-v1.prismlauncher
-    prusa-slicer
+    x86-v1.prusa-slicer
-    qalculate-gtk
+    x86-v1.qalculate-gtk
     vlc
     # browser
     brave
     chromium
     # dev tools
     gparted
-    jetbrains.datagrip
+    x86-v1.jetbrains.datagrip
     proxychains
     # hardware tools
     kicad-unstable

users/richie/home/gui/sweet.nix

@@ -1,6 +1,6 @@
 { pkgs, ... }:
 {
-  home.packages = with pkgs; [
+  home.packages = with pkgs.x86-v1; [
     sweet-nova
     candy-icons
   ];