feat(wm): add and enable swayidle

home/wm/default.nix

@@ -8,6 +8,7 @@
     ./hyprpaper.nix
     ./niri
     ./rofi
+    ./swayidle.nix
     ./swaylock.nix
     ./waybar
     ./xdg.nix

home/wm/swayidle.nix

@@ -0,0 +1,16 @@
+{ pkgs, ... }: {
+  services.swayidle = {
+    enable = true;
+
+    systemdTarget = "graphical-session.target";
+
+    events = [
+      { event = "before-sleep"; command = "${pkgs.swaylock}/bin/swaylock -fF"; }
+    ];
+
+    timeouts = [
+      { timeout = 300; command = "${pkgs.swaylock}/bin/swaylock -fF"; }
+      { timeout = 301; command = "${pkgs.niri}/bin/niri msg action power-off-monitors && ${pkgs.systemd}/bin/systemctl hibernate"; }
+    ];
+  };
+}