Draw idle as one timeline, and let the power button answer to its owner

Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8

config/dot/quickshell/shell.qml

@@ -106,7 +106,7 @@ ShellRoot {
     CaptureOverlay {}
     IntelligenceResult {}
     ActivityPanel {}
-    PowerMenu {}
+    PowerMenu { id: powerMenu }
     SettingsWindow { id: settingsWindow }
 
     // Toasts are their own always-on layer; they must be able to appear
@@ -606,6 +606,13 @@ ShellRoot {
     IpcHandler {
         target: "powermenu"
         function toggle(): void { ShellState.toggle("powermenu"); }
+        // Open with one entry pre-armed, by id: lock, logout, suspend,
+        // hibernate, restart, poweroff. The power-button bind uses this for
+        // its "Powers off" setting -- the first press opens the menu with
+        // Power Off armed and the second press is the menu's own confirm, so
+        // nothing here is a shortcut past it. An id this machine has no entry
+        // for just opens the menu.
+        function open(entry: string): void { powerMenu.preselect(entry); }
     }
 
     IpcHandler {