valw: install and bind for the test day

modules/home/home-valw.ulu.nix

@@ -0,0 +1,8 @@
+{ ... }:
+{
+  flake.homeModules.home-valw =
+    { inputs, pkgs, ... }:
+    {
+      home.packages = [ inputs.valw.packages.${pkgs.stdenv.hostPlatform.system}.default ];
+    };
+}

modules/home/niri/desktop-niri-keybinds.ulu.nix

@@ -38,7 +38,8 @@
           "Mod+Alt+V".action.spawn = [ "pavucontrol" ];
           "Mod+Shift+V".action.spawn-sh = "noctalia msg panel-toggle clipboard";
           "Mod+Shift+L".action.spawn-sh = "noctalia msg lock";
-          "Mod+Shift+S".action.spawn-sh = "noctalia msg screenshot-region";
+          "Mod+Shift+S".action.spawn = [ "valw" "region" ];
+          "Print".action.spawn = [ "valw" "screen" ];
           "Ctrl+Shift+Escape".action.spawn = [
             "ghostty"
             "-e"