Describe the bug

After a recent system update on Arch Linux (which likely updated gjs), AGS throws critical GJS TypeErrors related to D-Bus handling. The errors originate from gnim/dist/dbus.ts.

It appears that:

1. parameters is no longer treated as a GLib.Variant (or it's already unpacked), so calling .deepUnpack() throws an error.
2. The error handler then tries to call invocation.return_dbus_error(), which seems to have been removed/deprecated in newer GJS versions (snake_case vs camelCase removal).

Steps to reproduce

1. Run a fully updated Arch Linux system with the latest gjs.
2. Install/build the latest aylurs-gtk-shell-git and libastal-git packages.
3. Start AGS.
4. The critical errors appear in the terminal/logs when a D-Bus method is invoked.

Logs / Stack Trace

(gjs:42599): ags-CRITICAL **: 11:54:21.781: TypeError: parameters.deepUnpack is not a function
#handleMethodCall@file:///run/user/1000/ags.js:459:23
_init/GLib.MainLoop.prototype.runAsync/</<@resource:///org/gnome/gjs/modules/core/overrides/GLib.js:264:34

(gjs:42599): Gjs-CRITICAL **: 11:54:21.782: JS ERROR: TypeError: invocation.return_dbus_error is not afunction
#returnError@file:///run/user/1000/ags.js:438:25 -> ../../../usr/share/ags/js/node_modules/gnim/dist/dbus.ts:128:31
#handleMethodCall@file:///run/user/1000/ags.js:469:24 -> ../../../usr/share/ags/js/node_modules/gnim/dist/dbus.ts:170:18
_init/GLib.MainLoop.prototype.runAsync/</<@resource:///org/gnome/gjs/modules/core/overrides/GLib.js:264:34

Environment

OS: Arch Linux (Rolling)

AGS Version: aylurs-gtk-shell-git 3.1.1.r0.ge169694-1

Astal Versions: libastal-git r857.eb235f8-1 (and related -git packages)

Installation Method: AUR (yay)

Additional Context

A clean build (yay --cleanbuild) was performed, but the issue persists, indicating this is an upstream compatibility issue with the new GJS environment rather than a local build cache problem. Changing return_dbus_error to the camelCase modern GJS equivalent might be required, alongside adding a check before calling deepUnpack().