Fix qml themes

modules/theme/default.nix

@@ -1,4 +1,4 @@
-{ self, config, pkgs, ... }: {
+{ self, lib, config, pkgs, ... }: {
   environment.systemPackages = with pkgs; [
     qt5ct
     breeze-qt5
@@ -6,8 +6,16 @@
     breeze-icons
   ];
 
-  environment.variables = {
+  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)}";
   };
 
   home-manager.users.${config.main-user} = {