feat(hypridle): define config in home-manager with per-host timeouts

Replace the static hypridle.conf with services.hypridle.settings and add required timeout options so each host tunes its own values:

- idols-ai (PC): 15 min keyboard, 20 min screen-off, 30 min lock.
- 12kingdoms-shoukei (laptop): 3 / 6 / 20 min (previous values).

The options have no defaults because the right values depend on the machine. Update the home-manager eval test to inspect the settings option instead of the old config file text.

home/linux/gui/base/hypridle/default.nix

@@ -1,9 +1,66 @@
 {
+  config,
+  lib,
   ...
 }:
+let
+  cfg = config.modules.desktop.hypridle;
+in
 {
-  xdg.configFile."hypr/hypridle.conf".source = ./hypridle.conf;
+  options.modules.desktop.hypridle = {
+    keyboardBacklightTimeout = lib.mkOption {
+      type = lib.types.int;
+      description = "Seconds of idle before turning off the keyboard backlight.";
+    };
+    screenOffTimeout = lib.mkOption {
+      type = lib.types.int;
+      description = "Seconds of idle before turning off the monitors (DPMS).";
+    };
+    lockTimeout = lib.mkOption {
+      type = lib.types.int;
+      description = "Seconds of idle before locking the screen.";
+    };
+  };
 
-  # Hyprland idle daemon
-  services.hypridle.enable = true;
+  config = {
+    # Hyprland/niri idle daemon. Declared in Nix (instead of a raw
+    # hypridle.conf) so each host can tune the timeouts below.
+    services.hypridle = {
+      enable = true;
+
+      settings = {
+        general = {
+          lock_cmd = "noctalia-shell ipc call lockScreen lock";
+          before_sleep_cmd = "noctalia-shell ipc call lockScreen lock";
+          ignore_dbus_inhibit = false;
+        };
+
+        listener = [
+          {
+            timeout = cfg.keyboardBacklightTimeout;
+            # brightnessctl --list / -d kbd_backlight
+            on-timeout = "brightnessctl --save --device=kbd_backlight set 0";
+            on-resume = "brightnessctl --restore --device=kbd_backlight";
+          }
+          {
+            timeout = cfg.screenOffTimeout;
+            ignore_inhibit = true;
+            # Some apps keep idle-inhibit active even when they are only sitting
+            # on a page, which can prevent screen-off forever. Ignore those
+            # inhibitors for screen-off, but skip while an MPRIS player reports
+            # active playback.
+            condition_cmd = "! playerctl -a status 2>/dev/null | grep -q '^Playing$'";
+            condition_retry = 30;
+            on-timeout = "niri msg action power-off-monitors";
+            on-resume = "niri msg action power-on-monitors";
+          }
+          {
+            timeout = cfg.lockTimeout;
+            ignore_inhibit = true;
+            on-timeout = "noctalia-shell ipc call lockScreen lock";
+          }
+        ];
+      };
+    };
+  };
 }