feat(gui/kbd): add configurable ellipsis keybinding

- Introduce `gui.kbd.ellipsis.enable` option for keybinding.
- Move related xkb configuration to a dedicated module for clarity.
- Simplify `default.nix` by delegating ellipsis setup to the new module.

homes/x86_64-linux/harald@x1/default.nix

@@ -18,6 +18,7 @@
     tools = {
       git.enable = true;
     };
+    gui.kbd.ellipsis.enable = true;
   };
 
   fonts.fontconfig.enable = true;
@@ -64,16 +65,6 @@
   };
 
   dconf.settings."org/gnome/desktop/input-sources".xkb-options = [ "mod:ellipsis" ];
-  xdg.configFile."xkb/symbols/mod".text = ''
-    xkb_symbols "ellipsis" {
-      key <AB09> { [ period, greater, ellipsis, division ] };
-    };
-  '';
-  xdg.configFile."xkb/rules/evdev".text = ''
-    ! option = symbols
-      mod:ellipsis    = +mod(ellipsis)
-    ! include %S/evdev
-  '';
 
   xdg.enable = true;
   xdg.mime.enable = true;

modules/home/gui/kbd/default.nix

@@ -0,0 +1,25 @@
+{ config, lib, ... }:
+
+with lib;
+let
+  cfg = config.metacfg.gui.kbd;
+in
+{
+  options.metacfg.gui.kbd = {
+    ellipsis = mkEnableOption "ellipsis keybinding for period key";
+  };
+
+  config = mkIf cfg.ellipsis {
+    xdg.configFile."xkb/symbols/mod".text = ''
+      xkb_symbols "ellipsis" {
+        key <AB09> { [ period, greater, ellipsis, division ] };
+      };
+    '';
+    
+    xdg.configFile."xkb/rules/evdev".text = ''
+      ! option = symbols
+        mod:ellipsis    = +mod(ellipsis)
+      ! include %S/evdev
+    '';
+  };
+}