unified SessionService to support elogind equivalents of systemd

commands

Modals/FileBrowserModal.qml

@@ -1,5 +1,3 @@
-pragma ComponentBehavior
-
 import QtQuick
 import QtQuick.Controls
 import QtCore

Modals/PowerConfirmModal.qml

@@ -26,13 +26,13 @@ DankModal {
             CompositorService.logout()
             break
         case "suspend":
-            Quickshell.execDetached(["systemctl", "suspend"])
+            SessionService.suspend()
             break
         case "reboot":
-            Quickshell.execDetached(["systemctl", "reboot"])
+            SessionService.reboot()
             break
         case "poweroff":
-            Quickshell.execDetached(["systemctl", "poweroff"])
+            SessionService.poweroff()
             break
         }
     }

Modals/SettingsModal.qml

@@ -7,7 +7,6 @@ import qs.Common
 import qs.Modules.Settings
 import qs.Services
 import qs.Widgets
-pragma ComponentBehavior
 
 DankModal {
     id: settingsModal