Make status indicators event-driven instead of polling

The indicators widget broadcast a refresh every 2s, fanning out to four
status subprocesses (nightlight, idle, reminder, screen-recording), and
NightLight/StayAwake each ran an additional 5s poll. On an idle desktop
this was the dominant source of process churn (~33 of ~53 forks/sec in a
VM). The state-changing commands already push `omarchy.indicators
refresh` over IPC, so the polling was redundant.

Drop the 2s broadcast and the two 5s timers; indicators now refresh at
startup and on the IPC push. Also fix three callers that pushed to the
wrong target `Indicators` instead of `omarchy.indicators` (screen
recording, notification silencing, and the omarchy-shell help example) —
those pushes silently failed and only appeared to work because the poll
masked them.

Idle fork rate drops ~53/s to ~20/s.

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

bin/omarchy-capture-screenrecording

@@ -222,7 +222,7 @@ stop_screenrecording() {
 }
 
 toggle_screenrecording_indicator() {
-  omarchy-shell -q Indicators refresh
+  omarchy-shell -q omarchy.indicators refresh
 }
 
 screenrecording_active() {

bin/omarchy-shell

@@ -29,7 +29,7 @@ Options:
 
 Examples:
   omarchy-shell shell ping
-  omarchy-shell -q Indicators refresh
+  omarchy-shell -q omarchy.indicators refresh
   omarchy-shell shell listPlugins
   omarchy-shell shell toggle omarchy.menu '{"menu":"root"}'
 USAGE

bin/omarchy-toggle-notification-silencing

@@ -3,4 +3,4 @@
 # omarchy:summary=Toggle notification do-not-disturb mode
 
 state=$(omarchy-shell notifications toggleDnd 2>/dev/null || echo "")
-omarchy-shell -q Indicators refresh
+omarchy-shell -q omarchy.indicators refresh

shell/plugins/bar/indicators/NightLight.qml

@@ -54,12 +54,5 @@ BarIndicator {
     onTriggered: root.refresh()
   }
 
-  Timer {
-    interval: 5000
-    running: true
-    repeat: true
-    onTriggered: root.refresh()
-  }
-
   onPressed: function() { root.toggle() }
 }

shell/plugins/bar/indicators/StayAwake.qml

@@ -48,12 +48,5 @@ BarIndicator {
     onTriggered: root.refresh()
   }
 
-  Timer {
-    interval: 5000
-    running: true
-    repeat: true
-    onTriggered: root.refresh()
-  }
-
   onPressed: function() { root.toggle() }
 }

shell/plugins/bar/widgets/Indicators.qml

@@ -174,13 +174,7 @@ BarWidget {
     }
   }
 
-  Timer {
-    interval: 2000
-    running: true
-    repeat: true
-    triggeredOnStart: true
-    onTriggered: root.refreshRequested()
-  }
+  Component.onCompleted: root.refreshRequested()
 
   Row {
     id: horizontalIndicators