Update kde packages to kde6

modules/theme/default.nix

@@ -1,21 +1,16 @@
 { self, lib, config, pkgs, ... }: {
   environment.systemPackages = with pkgs; [
-    qt5ct
-    breeze-qt5
-    breeze-gtk
-    breeze-icons
+    qt6.qtwayland
+    kdePackages.breeze
+    kdePackages.breeze-icons
+    qt6.qtsvg # needed to load breeze icons
+
+    kdePackages.qqc2-desktop-style
   ];
 
-  environment.variables = let
-    qmlPackages = with pkgs; [
-      plasma5Packages.qqc2-desktop-style
-      plasma5Packages.kirigami2
-    ];
-
-    qtVersion = pkgs.qt515.qtbase.version;
-  in {
-    "QT_QPA_PLATFORMTHEME" = "qt5ct";
-    "QML2_IMPORT_PATH" = "${lib.concatStringsSep ":" (builtins.map (p: "${p}/lib/qt-${qtVersion}/qml") qmlPackages)}";
+  qt = {
+    enable = true;
+    platformTheme = "qt5ct";
   };
 
   home-manager.users.${config.main-user} = {
@@ -24,11 +19,8 @@
       Inherits=breeze_cursors
     '';
 
-    xdg.configFile = {
-      # fixes dolphin background colors
-      "kdeglobals".source = "${pkgs.breeze-qt5}/share/color-schemes/BreezeDark.colors";
-
-      "qt5ct/qt5ct.conf".text = ''
+    xdg.configFile = let
+      qtctConf = colors: ''
         [Appearance]
         style=Breeze
         icon_theme=breeze-dark
@@ -36,7 +28,7 @@
 
         # Cantata misbehaves without color overrides. This overrides the breeze colors with the
         # exact same colors.
-        color_scheme_path=${./breeze-dark-colors-override.conf}
+        color_scheme_path=${colors}
         custom_palette=true
 
         [Interface]
@@ -52,22 +44,31 @@
         underline_shortcut=1
         wheel_scroll_lines=3
       '';
+    in {
+      # fixes dolphin background colors
+      "kdeglobals".source = "${pkgs.kdePackages.breeze}/share/color-schemes/BreezeDark.colors";
+
+      "qt5ct/qt5ct.conf".text = qtctConf ./colors-qt5ct.conf;
+      "qt6ct/qt6ct.conf".text = qtctConf ./colors-qt6ct.conf;
     };
 
     gtk = {
       enable = true;
       theme = {
-        package = pkgs.breeze-gtk;
+        package = pkgs.kdePackages.breeze-gtk;
         name = "Breeze-Dark";
       };
       iconTheme = {
-        package = pkgs.breeze-icons;
+        package = pkgs.kdePackages.breeze-icons;
         name = "breeze-dark";
       };
       cursorTheme = {
-        package = pkgs.breeze-gtk;
+        package = pkgs.kdePackages.breeze-gtk;
         name = "breeze_cursors";
       };
+
+      gtk3.extraConfig.gtk-xft-rgba = "rgb";
+      gtk4.extraConfig.gtk-xft-rgba = "rgb";
     };
   };
 }