feat(hyprland): emit compositor config as lua

configs/nixos/modules/desktop/utilities/screenshot.nix

@@ -7,6 +7,16 @@
 # Keyboard-driven screenshots copy to the clipboard before Satty opens for
 # annotation. Satty copies annotated screenshots when it saves them.
 let
+  execBind = key: command: {
+    _args = [
+      key
+      (luaCall "hl.dsp.exec_cmd" [ command ])
+    ];
+  };
+  luaCall =
+    function: args:
+    lib.generators.mkLuaInline "${function}(${lib.concatMapStringsSep ", " toLua args})";
+
   user = config.user.name;
 
   grimblast = "${pkgs.grimblast}/bin/grimblast";
@@ -31,6 +41,8 @@ let
           --early-exit \
           --actions-on-enter save-to-clipboard
     '';
+
+  toLua = lib.generators.toLua { };
 in
 {
   options.modules.desktop.utilities.screenshot.enable =
@@ -40,19 +52,21 @@ in
     home-manager.users.${user} = {
       # satty is a one-shot annotation surface, so float it rather than letting
       # it claim a tile in the layout.
-      # windowrule v3 syntax: space-separated field/value tokens, comma
-      # separated, with matchers under a match: prefix and effects bare.
-      wayland.windowManager.hyprland.settings.windowrule = [
-        "float 1, match:class ^(com\\.gabm\\.satty)$"
+      wayland.windowManager.hyprland.settings.window_rule = [
+        {
+          name = "satty-float";
+          match.class = "^(com\\.gabm\\.satty)$";
+          float = true;
+        }
       ];
 
       # Print with plain/Shift/Ctrl for region/window/full.
       # Super+L is already the hjkl focus and movement bind, so screenshots take
       # the Print key instead.
       wayland.windowManager.hyprland.settings.bind = [
-        ", Print, exec, ${capture "area"}"
-        "SHIFT, Print, exec, ${capture "active"}"
-        "CTRL, Print, exec, ${capture "screen"}"
+        (execBind "Print" "${capture "area"}")
+        (execBind "SHIFT + Print" "${capture "active"}")
+        (execBind "CTRL + Print" "${capture "screen"}")
       ];
     };
   };