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>

test/shell.d/fixtures/indicator-contract/shell.qml

@@ -33,11 +33,20 @@ ShellRoot {
     }
   }
 
+  QtObject {
+    id: nightlightService
+    property bool enabled: false
+    function setNightlight(value) {
+      enabled = !!value
+    }
+  }
+
   QtObject {
     id: mockShell
     function firstPartyServiceFor(id) {
       if (id === "omarchy.notifications") return notificationService
       if (id === "omarchy.idle") return idleService
+      if (id === "omarchy.nightlight") return nightlightService
       return null
     }
   }
@@ -175,7 +184,7 @@ ShellRoot {
         nightLight.moduleName = "NightLight"
         root.injectBar(nightLight)
         nightLight.triggerPress(Qt.LeftButton)
-        root.assertTrue(root.commandCount("omarchy-toggle-nightlight") === 1, "Night Light left click runs toggle command")
+        root.assertTrue(nightlightService.enabled === true, "Night Light left click toggles the nightlight service")
       }
 
       var screenRecording = root.createIndicator("ScreenRecording")

test/shell.d/nightlight-test.sh

@@ -4,26 +4,61 @@ set -euo pipefail
 
 source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
 
+run_node_test <<'JS'
+const nightlight = requireFromRoot('shell/plugins/services/nightlight/NightlightModel.js')
+
+assertEqual(nightlight.temperatureFromOutput('4000\n'), 4000, 'nightlight parses probe temperature')
+assertEqual(nightlight.temperatureFromOutput("Couldn't connect to hyprsunset"), null, 'nightlight treats unreachable hyprsunset as unknown')
+assertEqual(nightlight.isNightlight(4000), true, 'nightlight reports warm temperatures as enabled')
+assertEqual(nightlight.isNightlight(5999), true, 'nightlight reports warmer-than-identity values as enabled')
+assertEqual(nightlight.isNightlight(6000), false, 'nightlight reports identity temperature as disabled')
+assertEqual(nightlight.isNightlight(null), false, 'nightlight reports unknown temperature as disabled')
+JS
+
 TMPDIR=$(mktemp -d)
 trap 'rm -rf "$TMPDIR"' EXIT
 
 mkdir -p "$TMPDIR/bin"
+STATE="$TMPDIR/hyprsunset-temp"
+SHELL_LOG="$TMPDIR/omarchy-shell-log"
 
 cat >"$TMPDIR/bin/hyprctl" <<'SH'
 #!/bin/bash
 
 if [[ ${1:-} == "hyprsunset" && ${2:-} == "temperature" ]]; then
-  printf '%s\n' "${HYPRSUNSET_TEMP:-6500}"
+  if [[ -n ${3:-} ]]; then
+    printf '%s\n' "$3" >"$HYPRSUNSET_STATE"
+  else
+    cat "$HYPRSUNSET_STATE" 2>/dev/null || exit 1
+  fi
   exit 0
 fi
 
 exit 1
 SH
 
-chmod +x "$TMPDIR/bin/hyprctl"
+cat >"$TMPDIR/bin/pgrep" <<'SH'
+#!/bin/bash
+exit 0
+SH
+
+cat >"$TMPDIR/bin/omarchy-shell" <<'SH'
+#!/bin/bash
+printf '%s\n' "$*" >>"$OMARCHY_SHELL_LOG"
+SH
+
+chmod +x "$TMPDIR/bin/hyprctl" "$TMPDIR/bin/pgrep" "$TMPDIR/bin/omarchy-shell"
+
+nightlight_cli() {
+  PATH="$TMPDIR/bin:$PATH" \
+  HYPRSUNSET_STATE="$STATE" \
+  OMARCHY_SHELL_LOG="$SHELL_LOG" \
+    "$ROOT/bin/omarchy-toggle-nightlight" "$@"
+}
 
 nightlight_status() {
-  HYPRSUNSET_TEMP="$1" PATH="$TMPDIR/bin:$PATH" "$ROOT/bin/omarchy-toggle-nightlight" --status
+  printf '%s\n' "$1" >"$STATE"
+  nightlight_cli --status
 }
 
 [[ $(nightlight_status 4000 | jq -r .enabled) == "true" ]] || fail "nightlight status reports 4000K as enabled"
@@ -37,3 +72,21 @@ pass "nightlight status reports identity temperature as disabled"
 
 [[ $(nightlight_status 6500 | jq -r .enabled) == "false" ]] || fail "nightlight status reports daylight temperature as disabled"
 pass "nightlight status reports daylight temperature as disabled"
+
+printf '6500\n' >"$STATE"
+: >"$SHELL_LOG"
+nightlight_cli >/dev/null
+[[ $(<"$STATE") == 4000 ]] || fail "nightlight toggle warms the screen from daylight"
+pass "nightlight toggle warms the screen from daylight"
+
+grep -Fqx -- '-q nightlight refresh' "$SHELL_LOG" || fail "nightlight toggle nudges the shell nightlight service"
+pass "nightlight toggle nudges the shell nightlight service"
+
+nightlight_cli >/dev/null
+[[ $(<"$STATE") == 6500 ]] || fail "nightlight toggle restores daylight from night light"
+pass "nightlight toggle restores daylight from night light"
+
+if rg -q 'omarchy.indicators' "$ROOT/bin/omarchy-toggle-nightlight"; then
+  fail "nightlight toggle leaves indicator refresh to the nightlight service"
+fi
+pass "nightlight toggle leaves indicator refresh to the nightlight service"