feat(settings): Added Settings Tab Autostart App (XDG Autostart) (#2535)

* feat(Autostart): add Autostart tab and application selection popup

* fix(AutoStartTab): update systemdUserDir property to use XDG_CONFIG_HOME

* fix(AutoStartTab): update autostartDir and systemdUserDir to use StandardPaths for config home

* refactor(AutoStartTab): use FileView & FolderListModel

* refactor(AutoStartTab): implement systemd override generation for autostart applications using FileView

* feat(AutoStartTab): add systemd check to determine environment and update tray icon visibility

* feat(SettingsSidebar, AutoStartTab, DesktopService): add autostart functionality and systemd checks

* feat(AutoStartTab): add hidden property support for desktop entries and toggle functionality

* feat(AutoStartTab): add initialize autostart directory and add toast if writer failed

* add(AutoStartTab): logging for scoped log tracking

---------

quickshell/Modals/Settings/SettingsSidebar.qml

@@ -245,6 +245,13 @@ Rectangle {
                     "icon": "app_registration",
                     "tabIndex": 19,
                     "hyprlandNiriOnly": true
+                },
+                {
+                    "id": "autostart",
+                    "text": I18n.tr("Autostart Apps"),
+                    "icon": "line_start",
+                    "tabIndex": 36,
+                    "autostartOnly": true
                 }
             ]
         },
@@ -369,6 +376,8 @@ Rectangle {
             return false;
         if (item.updaterOnly && !SystemUpdateService.sysupdateAvailable)
             return false;
+        if (item.autostartOnly && !DesktopService.autostartAvailable)
+            return false;
         return true;
     }