feat(hyprland): migrate hardware key bindings

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

@@ -1,9 +1,43 @@
-{ config, lib, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 # PipeWire as the desktop audio server.
 {
   options.modules.desktop.utilities.audio.enable = lib.mkEnableOption "the PipeWire audio server";
 
   config = lib.mkIf config.modules.desktop.utilities.audio.enable {
+    registry.keybind.${config.networking.hostName} = {
+      media-play = {
+        keys = "XF86AudioPlay";
+        locked = true;
+        action = {
+          kind = "exec";
+          command = "${pkgs.playerctl}/bin/playerctl play-pause";
+        };
+      };
+
+      media-next = {
+        keys = "XF86AudioNext";
+        locked = true;
+        action = {
+          kind = "exec";
+          command = "${pkgs.playerctl}/bin/playerctl next";
+        };
+      };
+
+      media-previous = {
+        keys = "XF86AudioPrev";
+        locked = true;
+        action = {
+          kind = "exec";
+          command = "${pkgs.playerctl}/bin/playerctl previous";
+        };
+      };
+    };
+
     # Realtime scheduling for the audio threads, so playback survives load.
     security.rtkit.enable = true;