darken kde apps

home/theme.nix

@@ -15,6 +15,10 @@
 #   Qt5/Qt6   qt5ct/qt6ct, because nixpkgs builds qtbase without the qgtk3
 #             platform theme (withGtk3 = false), so QT_QPA_PLATFORMTHEME=gtk3
 #             would silently do nothing.
+#   KDE apps  KColorScheme reads colors from ~/.config/kdeglobals, not the Qt
+#             palette, and falls back to light Breeze when it is missing --
+#             which is why KDE apps came out half dark, half white. A
+#             .colors file is already in kdeglobals format.
 { pkgs, ... }:
 
 {
@@ -44,7 +48,7 @@
 
     # Pulls adwaita-qt{,6} in without setting QT_STYLE_OVERRIDE -- that
     # variable makes qt5ct/qt6ct skip their own config entirely.
-    style.package = [ pkgs.adwaita-qt pkgs.adwaita-qt6 ];
+    style.package = [ pkgs.adwaita-qt pkgs.adwaita-qt6 pkgs.kdePackages.breeze ];
 
     qt5ctSettings.Appearance = {
       style = "Adwaita-Dark";
@@ -53,9 +57,12 @@
     };
 
     qt6ctSettings.Appearance = {
-      style = "Adwaita-Dark";
+      style = "Breeze";
       icon_theme = "Adwaita";
       standard_dialogs = "xdgdesktopportal";
     };
   };
+
+  xdg.configFile."kdeglobals".source =
+    "${pkgs.kdePackages.breeze}/share/color-schemes/BreezeDark.colors";
 }