Move Night Light onto a first-party nightlight service

Same treatment as Stay Awake: the indicator polled the toggle CLI over
a Process with a timer to paper over the race after clicking, and the
CLI ended by asking the shell to refresh every indicator over IPC. A new
omarchy.nightlight service owns hyprsunset instead - it probes the
temperature on startup, applies changes itself for in-shell toggles, and
answers on the nightlight IPC target. The indicator becomes a plain
binding. The CLI still drives hyprctl directly so keybindings, the menu,
and ssh work without the shell, but now just nudges the service to
re-probe since hyprsunset has no state file to watch.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

shell/plugins/bar/indicators/NightLight.qml

@@ -1,57 +1,19 @@
 import QtQuick
-import Quickshell.Io
 import qs.Ui
 
 BarIndicator {
   id: root
 
-  property bool nightlight: false
+  readonly property var nightlightService: bar?.shell?.firstPartyServiceFor("omarchy.nightlight")
 
-  active: nightlight
+  active: nightlightService ? nightlightService.enabled : false
   activeText: "󰔎"
   inactiveText: "󰔎"
   activeTooltipText: "Day Light"
   inactiveTooltipText: "Night Light"
 
-  function refresh() {
-    if (!statusProc.running) statusProc.running = true
-  }
-
-  function update(raw) {
-    var data = extractData(raw)
-    nightlight = data && data.enabled === true
-  }
-
   function toggle() {
-    nightlight = !nightlight
-    if (root.bar) root.bar.run("omarchy-toggle-nightlight")
-    refreshTimer.restart()
-  }
-
-  Component.onCompleted: refresh()
-
-  Connections {
-    target: root.indicatorHost
-    ignoreUnknownSignals: true
-    function onRefreshRequested() { root.refresh() }
-  }
-
-  Process {
-    id: statusProc
-    command: ["omarchy-toggle-nightlight", "--status"]
-    stdout: StdioCollector {
-      waitForEnd: true
-      onStreamFinished: root.update(text)
-    }
-    onExited: function(exitCode) {
-      if (exitCode !== 0) root.nightlight = false
-    }
-  }
-
-  Timer {
-    id: refreshTimer
-    interval: 1500
-    onTriggered: root.refresh()
+    if (root.nightlightService) root.nightlightService.setNightlight(!root.active)
   }
 
   onPressed: function() { root.toggle() }