Updated everything

hosts/common/optional/lxqt-niri.nix

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+# LXQt Desktop Environment with Niri Window Manager
+#
+# This module provides LXQt desktop environment components running with
+# Niri as the Wayland compositor instead of the default window manager.
+#
+# Features:
+# - LXQt panel, settings, file manager, and utilities
+# - Niri as the tiling Wayland compositor
+# - Proper Qt theming with LXQt themes and Kvantum
+# - XDG portals for screen sharing and file dialogs
+# - Audio, network, and power management integration
+#
+# Usage:
+# Add this to your host configuration:
+#   imports = lib.flatten [
+#     # ... other imports ...
+#     "hosts/common/optional/lxqt-niri.nix"
+#     "hosts/common/optional/gdm.nix"  # or sddm.nix for display manager
+#   ];
+#
+# The session will appear as "LXQt (Niri)" in the session list.
+#
+{
+  pkgs,
+  inputs,
+  lib,
+  ...
+}: {
+  imports = [
+    inputs.niri.nixosModules.niri
+  ];
+
+  # Enable Niri as the window manager
+  programs.niri.enable = true;
+
+  # Enable LXQt desktop environment components
+  # Note: We don't enable services.xserver.desktopManager.lxqt.enable = true
+  # because it would conflict with our custom display manager configuration
+  services.xserver = {
+    enable = true;
+  };
+
+  # Install additional LXQt components and utilities
+  environment.systemPackages = with pkgs; [
+    # Core LXQt components that work well with other window managers
+    lxqt.lxqt-panel
+    lxqt.lxqt-session
+    lxqt.lxqt-config
+    lxqt.lxqt-themes
+    lxqt.lxqt-notificationd
+    lxqt.lxqt-powermanagement
+    lxqt.lxqt-policykit
+    lxqt.lxqt-archiver
+    lxqt.qterminal
+    lxqt.pcmanfm-qt
+    lxqt.lximage-qt
+    lxqt.qps
+
+    # Theme engines and styling
+    libsForQt5.qtstyleplugins
+    libsForQt5.qt5ct
+
+    # System tools that integrate well with LXQt
+    lxqt.pavucontrol-qt
+    qpwgraph
+
+    # Network management
+    libsForQt5.networkmanager-qt
+
+    # Custom session script
+    (writeScriptBin "niri-session" ''
+      #!/bin/sh
+
+      # Set up environment
+      export XDG_CURRENT_DESKTOP=LXQt
+      export XDG_SESSION_DESKTOP=lxqt-niri
+      export DESKTOP_SESSION=lxqt-niri
+
+      # Start LXQt session components in background
+      ${lxqt.lxqt-session}/bin/lxqt-session &
+
+      # Start Niri as the main session
+      exec ${niri}/bin/niri
+    '')
+  ];
+
+  # Configure XDG portals for better integration
+  xdg.portal = {
+    enable = true;
+    extraPortals = with pkgs; [
+      xdg-desktop-portal-gtk
+      xdg-desktop-portal-wlr
+    ];
+    config = {
+      common = {
+        default = ["gtk"];
+        "org.freedesktop.impl.portal.Screenshot" = ["wlr"];
+        "org.freedesktop.impl.portal.Screencast" = ["wlr"];
+      };
+    };
+  };
+
+  # Use LXQt's polkit agent
+  security.polkit.enable = true;
+  systemd.user.services.lxqt-policykit-agent = {
+    description = "LXQt PolicyKit Agent";
+    wantedBy = ["graphical-session.target"];
+    wants = ["graphical-session.target"];
+    after = ["graphical-session.target"];
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = "${pkgs.lxqt.lxqt-policykit}/bin/lxqt-policykit-agent";
+      Restart = "on-failure";
+      RestartSec = 1;
+      TimeoutStopSec = 10;
+    };
+  };
+
+  # Configure Qt theming (basic settings)
+  # Note: More specific Qt theming may be handled by system-wide theming modules
+
+  # Configure Qt theming to use LXQt
+  qt = {
+    platformTheme = lib.mkForce "lxqt";
+  };
+
+  # Environment variables for proper integration
+  environment.sessionVariables = {
+    NIXOS_OZONE_WL = "1";
+    QT_QPA_PLATFORM = "wayland;xcb";
+    QT_WAYLAND_DISABLE_WINDOWDECORATION = "1";
+    QT_AUTO_SCREEN_SCALE_FACTOR = "1";
+    QT_QPA_PLATFORMTHEME = lib.mkForce "lxqt";
+    QT_STYLE_OVERRIDE = "kvantum";
+    DESKTOP_SESSION = "lxqt-niri";
+    XDG_CURRENT_DESKTOP = "LXQt";
+    XDG_SESSION_DESKTOP = "lxqt-niri";
+  };
+
+  # Enable necessary services for LXQt functionality
+  services = {
+    # Power management
+    upower.enable = true;
+  };
+
+  # Create a custom session file for LXQt + Niri
+  environment.etc."xdg/lxqt/session.conf".text = ''
+    [General]
+    __userfile__=true
+    window_manager=niri
+  '';
+
+  # Create desktop entry for the session
+  environment.etc."wayland-sessions/lxqt-niri.desktop".text = ''
+    [Desktop Entry]
+    Name=LXQt (Niri)
+    Comment=LXQt Desktop with Niri Window Manager
+    Exec=niri-session
+    Type=Application
+    Keywords=niri;lxqt;wayland;
+  '';
+}