Stop polling monitor/network state on an idle desktop

The monitor panel polled `omarchy-monitor-state` every 5s (26 forks per
call) and the network panel polled `omarchy-network-status` every 3s,
both with `running: true` rather than gating like the sibling panels.

Monitor: gate the poll on `opened` (brightness/scale are only shown in
the open panel, which already refreshes on open) and drive the bar glyph
from Quickshell.screens instead of the polled display list, so monitor
count stays correct without polling.

Network: the bar pill needs live-ish state, so keep polling but at 10s
instead of 3s. (Deriving the pill from the native Networking service
would remove the poll entirely; left as a follow-up since it needs Wi-Fi
state testing.)

Idle fork rate drops ~20/s to ~14/s.

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

shell/plugins/panels/monitor/Panel.qml

@@ -278,9 +278,12 @@ Panel {
   onDisplaysChanged: clampCursor()
   onVisibleSectionsChanged: clampCursor()
 
+  // Only poll while the panel is open; the bar glyph tracks monitor count via
+  // Quickshell.screens, and open-time refresh + Component.onCompleted cover the
+  // rest. External brightness changes are reflected whenever the panel is open.
   Timer {
     interval: 5000
-    running: true
+    running: root.opened
     repeat: true
     onTriggered: root.refresh()
   }
@@ -341,7 +344,7 @@ Panel {
     id: button
     anchors.fill: parent
     bar: root.bar
-    text: root.displays.length > 1 ? "󰍺" : "󰍹"
+    text: Quickshell.screens.length > 1 ? "󰍺" : "󰍹"
     onPressed: function(b) { root.toggle() }
     onWheelMoved: function(delta) {
       if (root.brightnessAvailable) root.setBrightness(root.brightnessPercent + (delta > 0 ? 5 : -5))

shell/plugins/panels/network/Panel.qml

@@ -1505,7 +1505,7 @@ Panel {
   }
 
   Timer {
-    interval: 3000
+    interval: 10000
     running: true
     repeat: true
     triggeredOnStart: true