fix: ghostty dock support and display fix

modules/home-manager/ghostty.nix

@@ -1,13 +1,61 @@
-{ pkgs, ... }:
+{ pkgs, lib, ... }:
 
+let
+  isLinux = pkgs.stdenv.isLinux;
+
+  # Wrap ghostty on Linux to force the 'gl' renderer, fixing EGL display errors 
+  # common in GTK4 environments on some distributions.
+  ghostty-pkg = if isLinux then 
+    pkgs.symlinkJoin {
+      name = "ghostty";
+      paths = [ pkgs.ghostty ];
+      nativeBuildInputs = [ pkgs.makeWrapper ];
+      postBuild = ''
+        wrapProgram $out/bin/ghostty \
+          --set GSK_RENDERER gl
+      '';
+    }
+    else pkgs.ghostty;
+  # Create a dedicated launcher script for Ghostty on Linux to handle nixGL and environment.
+  ghostty-launcher = pkgs.writeShellScriptBin "ghostty-launcher" ''
+    # Source nix profiles to ensure 'nix' and other tools are in PATH
+    if [ -e "$HOME/.nix-profile/etc/profile.d/nix.sh" ]; then
+      . "$HOME/.nix-profile/etc/profile.d/nix.sh"
+    elif [ -e /nix/var/nix/profiles/default/etc/profile.d/nix.sh ]; then
+      . /nix/var/nix/profiles/default/etc/profile.d/nix.sh
+    fi
+
+    export NIXPKGS_ALLOW_UNFREE=1
+    export GSK_RENDERER=gl
+
+    # Execute ghostty via nixGL
+    exec /nix/var/nix/profiles/default/bin/nix run --impure github:nix-community/nixGL#nixGLNvidia -- ghostty "$@"
+  '';
+in
 {
   home.packages = [
-    pkgs.ghostty
+    ghostty-pkg
+    (lib.mkIf isLinux ghostty-launcher)
   ];
 
   home.file.".config/ghostty/config".text = ''
     command = ${pkgs.tmux}/bin/tmux
     theme = dark:Dracula,light:Dracula
     font-size = 12
   '';
+
+  # Enable XDG desktop entries to support launching from the Ubuntu dock
+  xdg.enable = true;
+  xdg.desktopEntries."com.mitchellh.ghostty" = lib.mkIf isLinux {
+    name = "Ghostty";
+    genericName = "Terminal Emulator";
+    exec = "${ghostty-launcher}/bin/ghostty-launcher";
+    icon = "${pkgs.ghostty}/share/icons/hicolor/512x512/apps/com.mitchellh.ghostty.png";
+    terminal = false;
+    categories = [ "System" "TerminalEmulator" ];
+    comment = "Ghostty terminal via nixGL";
+    settings = {
+      StartupWMClass = "com.mitchellh.ghostty";
+    };
+  };
 }