theme: use qtengine

modules/theme/default.nix

@@ -1,4 +1,28 @@
-{ self, lib, config, pkgs, ... }: {
+{ self, lib, config, pkgs, inputs, ... }: {
+  imports = [ inputs.qtengine.nixosModules.default ];
+
+  programs.qtengine = {
+    enable = true;
+
+    config = {
+      theme = {
+        colorScheme = "${pkgs.kdePackages.breeze}/share/color-schemes/BreezeDark.colors";
+        iconTheme = "breeze-dark";
+        style = "breeze";
+        fontFixed = "JetBrainsMono Nerd Font";
+        fontFixedSize = 12;
+        font = "DejaVu Sans";
+        fontSize = 12;
+      };
+
+      misc = {
+        singleClickActivate = false;
+        menusHaveIcons = true;
+        shortcutsForContextMenus = true;
+      };
+    };
+  };
+
   environment.systemPackages = with pkgs; [
     qt6.qtwayland
     kdePackages.breeze
@@ -15,7 +39,7 @@
 
   qt = {
     enable = true;
-    platformTheme = "qt5ct";
+    platformTheme = null;
   };
 
   home-manager.users.${config.main-user} = {