[i3] Add compositor

KDE applications in i3 were showing only "Other..." in default
applications due to missing applications.menu file. Plasma 6 renamed
applications.menu to plasma-applications.menu but KDE components
still look for the old name.

This creates a symlink from the new location to the expected location
using XDG config file management.

Fixes kmail and systemsettings not detecting installed applications.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

home/modules/i3+sway/default.nix

@@ -128,7 +128,7 @@ in {
           }
           # Picom compositor for smooth rendering and no tearing (important for Nvidia)
           {
-            command = "picom -b";
+            command = "picom --backend glx -b";
             always = false;
             notification = false;
           }
@@ -138,6 +138,12 @@ in {
             always = false;
             notification = false;
           }
+          # Set wallpaper with feh
+          {
+            command = "feh --bg-scale ${../../wallpapers/metroid-samus-returns-kz-3440x1440.jpg}";
+            always = false;
+            notification = false;
+          }
         ];
       };
     in {
@@ -163,6 +169,11 @@ in {
             dwt = "enabled";
           };
         };
+        output = {
+          "*" = {
+            bg = "${../../wallpapers/metroid-samus-returns-kz-3440x1440.jpg} fill";
+          };
+        };
       };
     in {
       enable = true;

home/modules/plasma-manager/default.nix

@@ -167,6 +167,12 @@
         AutoRaiseInterval = 750;  # Delay in ms before auto-raise (if enabled)
         DelayFocusInterval = 0;  # Delay in ms before focus follows mouse
       };
+
+      # Desktop wallpaper configuration
+      plasma-localerc.Formats.LANG = "en_US.UTF-8";
+      
+      # Set wallpaper for all desktops
+      plasmarc.Wallpapers.usersWallpapers = "${../../wallpapers/metroid-samus-returns-kz-3440x1440.jpg}";
     };
   };
 }

home/roles/desktop/default.nix

@@ -19,9 +19,11 @@ in
       kitty
       
       # Desktop utilities
+      feh # Image viewer and wallpaper setter for X11
       solaar # Logitech management software
       waybar
       wofi
+      xdg-utils # XDG utilities for opening files/URLs with default applications
       
       # System utilities with GUI components
       (snapcast.override { pulseaudioSupport = true; })
@@ -37,6 +39,14 @@ in
       kdePackages.kaddressbook
       kdePackages.kontact
       
+      # KDE System components needed for proper integration
+      kdePackages.kded
+      kdePackages.systemsettings
+      kdePackages.kmenuedit
+      
+      # Desktop menu support
+      kdePackages.plasma-desktop # Contains applications.menu
+      
       # KDE Online Accounts support
       kdePackages.kaccounts-integration
       kdePackages.kaccounts-providers
@@ -70,7 +80,79 @@ in
       enable = true;
     };
 
-    xdg.enable = true;
+    # KDE environment variables for proper integration
+    home.sessionVariables = {
+      QT_QPA_PLATFORMTHEME = "kde";
+      KDE_SESSION_VERSION = "6";
+    };
+
+    xdg = {
+      enable = true;
+      
+      # Ensure desktop files are made available for discovery
+      desktopEntries = {};  # This creates the desktop files directory structure
+      
+      mimeApps = {
+        enable = true;
+        associations.added = {
+          # Ensure associations are properly registered
+          "text/html" = "firefox.desktop";
+          "x-scheme-handler/http" = "firefox.desktop";
+          "x-scheme-handler/https" = "firefox.desktop";
+        };
+        defaultApplications = {
+          # Web browsers
+          "text/html" = "firefox.desktop";
+          "x-scheme-handler/http" = "firefox.desktop";
+          "x-scheme-handler/https" = "firefox.desktop";
+          "x-scheme-handler/about" = "firefox.desktop";
+          "x-scheme-handler/unknown" = "firefox.desktop";
+          
+          # Documents
+          "application/pdf" = "okular.desktop";
+          "text/plain" = "kate.desktop";
+          "text/x-tex" = "kate.desktop";
+          "text/x-c" = "kate.desktop";
+          "text/x-python" = "kate.desktop";
+          "application/x-shellscript" = "kate.desktop";
+          
+          # Images
+          "image/png" = "gwenview.desktop";
+          "image/jpeg" = "gwenview.desktop";
+          "image/jpg" = "gwenview.desktop";
+          "image/gif" = "gwenview.desktop";
+          "image/bmp" = "gwenview.desktop";
+          "image/tiff" = "gwenview.desktop";
+          "image/webp" = "gwenview.desktop";
+          
+          # Archives
+          "application/zip" = "ark.desktop";
+          "application/x-tar" = "ark.desktop";
+          "application/x-compressed-tar" = "ark.desktop";
+          "application/x-7z-compressed" = "ark.desktop";
+          "application/x-rar" = "ark.desktop";
+          
+          # Audio
+          "audio/mpeg" = "elisa.desktop";
+          "audio/mp4" = "elisa.desktop";
+          "audio/flac" = "elisa.desktop";
+          "audio/ogg" = "elisa.desktop";
+          "audio/wav" = "elisa.desktop";
+          
+          # Email
+          "message/rfc822" = "kmail.desktop";
+          "x-scheme-handler/mailto" = "kmail.desktop";
+          
+          # Calendar
+          "text/calendar" = "korganizer.desktop";
+          "application/x-vnd.akonadi.calendar.event" = "korganizer.desktop";
+        };
+      };
+    };
+
+    # Fix for KDE applications.menu file issue on Plasma 6
+    # KDE still looks for applications.menu but Plasma 6 renamed it to plasma-applications.menu
+    xdg.configFile."menus/applications.menu".source = "${pkgs.kdePackages.plasma-workspace}/etc/xdg/menus/plasma-applications.menu";
 
     # Note: modules must be imported at top-level home config
   };

machines/zix790prors/configuration.nix

@@ -52,9 +52,9 @@ with lib;
   hardware.graphics.enable = true;
   hardware.graphics.enable32Bit = true;
   
-  # Set DP-0 as primary display for system tray and multi-monitor setup
+  # Set DP-0 as primary display with 164.90Hz refresh rate
   services.xserver.displayManager.sessionCommands = ''
-    ${pkgs.xorg.xrandr}/bin/xrandr --output DP-0 --primary
+    ${pkgs.xorg.xrandr}/bin/xrandr --output DP-0 --mode 3440x1440 --rate 164.90 --primary
   '';
 
   hardware.nvidia = {

roles/desktop/programs.nix

@@ -16,5 +16,22 @@ in
     programs.dconf.enable = true;
     services.gnome.gnome-keyring.enable = true;
     programs.kdeconnect.enable = true;
+
+    # XDG Desktop Portal for default application handling in non-KDE environments
+    xdg.portal = {
+      enable = true;
+      extraPortals = with pkgs; [
+        kdePackages.xdg-desktop-portal-kde  # For KDE application integration
+        xdg-desktop-portal-gtk  # Fallback for GTK applications
+      ];
+      config = {
+        common = {
+          default = "kde";
+        };
+        i3 = {
+          default = ["kde" "gtk"];
+        };
+      };
+    };
   };
 }