Struggling to configure GTk/QT theme on laptop

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AHA!

Got it working! I manually wrote the configuration files for qt5ct and qt6ct this way:

  xdg.configFile = lib.mkIf hasSeat {
    kvantum = {
      target = "Kvantum/kvantum.kvconfig";
      text = lib.generators.toINI { } {
        General.theme = "Catppuccin-Mocha-Blue";
      };
    };

    qt5ct = {
      target = "qt5ct/qt5ct.conf";
      text = lib.generators.toINI { } {
        Appearance = {
          icon_theme = "Papirus-Dark";
        };
      };
    };

    qt6ct = {
      target = "qt6ct/qt6ct.conf";
      text = lib.generators.toINI { } {
        Appearance = {
          icon_theme = "Papirus-Dark";
        };
      };
    };

My hasSeat is a boolean that only writes this file if I have a systemd-seat (graphical interface), I use the same configuration files for my headless server. I need this because I use impermanence (Erase your darlings: immutable infrastructure for mutable systems - Graham Christensen). Also, I don’t want to have to manually setup my icons in the other laptop.

My complete configuration file is now this: wm-theme with these extra packages system-wide:

    libsForQt5.qtstyleplugin-kvantum.
    libsForQt5.qt5ct # Magic for some Qt apps keep functionality.

But it seems those two could be moved to my user.

Thank you @eljamm @nex!

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