Refresh bar widgets on every monitor, not just one

A bar surface is built per monitor, so a widget in the layout is live once
per screen — but an IPC target only ever routes to the handler that
registered first. `omarchy.indicators refresh` therefore reached a single
bar, and since indicators only re-read their state on that signal, the
other screens kept showing a stale reminder count, tmux alert, or DND
state until the next reload. Clock and system-update refreshes had the
same reach.

Let the bar resolve every live instance of a widget id and relay the call
to all of them.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

shell/plugins/bar/Bar.qml

@@ -384,11 +384,25 @@ Item {
     return true
   }
 
+  // Every live instance of a widget id. A bar surface is built per monitor, so
+  // a widget that appears once in the layout is still live once per screen.
+  function moduleWidgets(pluginId) {
+    var id = String(pluginId || "")
+    var items = []
+    if (!id) return items
+    for (var i = 0; i < moduleSlots.length; i++) {
+      var slot = moduleSlots[i]
+      if (!slot || !slot.activeItem || slot.moduleName !== id) continue
+      items.push(slot.activeItem)
+    }
+    return items
+  }
+
   // Resolve the live bar-widget instance for a plugin id (e.g. "omarchy.bluetooth").
   // Only widgets that expose popup open/close methods count; plain indicators
   // (clock, workspaces, tray) return null. Used by shell.summon/toggle so
-  // panel hotkeys route through the bar instead of a per-target IpcHandler
-  // that goes stale when the bar reloads its widget instances.
+  // panel hotkeys route through the bar instead of a per-target IPC handler
+  // that only reaches whichever per-monitor instance claimed the target.
   function findPanelWidget(pluginId) {
     var id = String(pluginId || "")
     if (!id) return null