nero: overlay wivrn from unstable to resolve mismatched qt6.11 dependency

hosts/nero/configuration.nix

@@ -5,6 +5,10 @@
 }:
 let
   unstable = inputs.nixpkgs-unstable.legacyPackages.${pkgs.stdenv.hostPlatform.system};
+
+  wivrn-overlay = _final: _prev: {
+    inherit (unstable) wivrn;
+  };
 in
 {
   imports = [
@@ -13,6 +17,10 @@ in
     ../../features/flatpak.nix
   ];
 
+  nixpkgs.overlays = [
+    wivrn-overlay
+  ];
+
   boot = {
     kernelParams = [
       "vfio-pci.ids=10de:2782,10de:22bc"