refactor(hyprland): store keybind chord as string

configs/nixos/modules/desktop/session/hyprland/default.nix

@@ -7,7 +7,7 @@
 let
   mkBind = keybind: {
     _args = [
-      (lib.concatStringsSep " + " keybind.keys)
+      keybind.keys
       (lib.generators.mkLuaInline "hl.dsp.exec_cmd(${toLua keybind.command})")
     ];
   };
@@ -23,10 +23,7 @@ in
   config = lib.mkIf config.modules.desktop.session.hyprland.enable {
     registry.keybind.${config.networking.hostName} = {
       hyprland-terminal = {
-        keys = [
-          "SUPER"
-          "Return"
-        ];
+        keys = "SUPER + Return";
         command = "ghostty";
       };
     };

configs/nixos/registry/keybind.nix

@@ -1,21 +1,12 @@
 { lib, ... }:
 {
-  checks = [
-    {
-      assertion = entries: lib.all (entry: entry.value.keys != [ ]) entries;
-      message = "Desktop keybinds must set at least one key.";
-    }
-  ];
 
   type = lib.types.submodule {
     options = {
       keys = lib.mkOption {
-        type = lib.types.listOf lib.types.str;
-        example = [
-          "SUPER"
-          "Return"
-        ];
-        description = "Sets the ordered key parts for this desktop keybind.";
+        type = lib.types.str;
+        example = "SUPER + Return";
+        description = "Sets the key chord for this desktop keybind.";
       };
 
       command = lib.mkOption {